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gecko-dev/layout/base/nsCSSFrameConstructor.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=2:
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* construction of a frame tree that is nearly isomorphic to the content
* tree and updating of that tree in response to dynamic changes
*/
#include "nsCSSFrameConstructor.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/dom/HTMLSelectElement.h"
#include "mozilla/Likely.h"
#include "mozilla/LinkedList.h"
#include "nsAbsoluteContainingBlock.h"
#include "nsIAtom.h"
#include "nsIFrameInlines.h"
#include "nsGkAtoms.h"
#include "nsPresContext.h"
#include "nsIDocument.h"
#include "nsTableFrame.h"
#include "nsTableColFrame.h"
#include "nsIDOMHTMLDocument.h"
#include "nsHTMLParts.h"
#include "nsIPresShell.h"
#include "nsUnicharUtils.h"
#include "nsStyleSet.h"
#include "nsViewManager.h"
#include "nsEventStates.h"
#include "nsStyleConsts.h"
#include "nsIDOMXULElement.h"
#include "nsContainerFrame.h"
#include "nsINameSpaceManager.h"
#include "nsIComboboxControlFrame.h"
#include "nsIListControlFrame.h"
#include "nsIDOMCharacterData.h"
#include "nsPlaceholderFrame.h"
#include "nsTableRowGroupFrame.h"
#include "nsIFormControl.h"
#include "nsCSSAnonBoxes.h"
#include "nsTextFragment.h"
#include "nsIAnonymousContentCreator.h"
#include "nsBindingManager.h"
#include "nsXBLBinding.h"
#include "nsContentUtils.h"
#include "nsIScriptError.h"
#ifdef XP_MACOSX
#include "nsIDocShellTreeItem.h"
#endif
#include "ChildIterator.h"
#include "nsError.h"
#include "nsLayoutUtils.h"
#include "nsAutoPtr.h"
#include "nsBoxFrame.h"
#include "nsBoxLayout.h"
#include "nsFlexContainerFrame.h"
#include "nsImageFrame.h"
#include "nsIObjectLoadingContent.h"
#include "nsTArray.h"
#include "nsGenericDOMDataNode.h"
#include "mozilla/dom/Element.h"
#include "nsAutoLayoutPhase.h"
#include "nsStyleStructInlines.h"
#include "nsPageContentFrame.h"
#include "RestyleManager.h"
#ifdef MOZ_XUL
#include "nsIRootBox.h"
#endif
#ifdef ACCESSIBILITY
#include "nsAccessibilityService.h"
#endif
#include "nsBlockFrame.h"
#include "nsIScrollableFrame.h"
#include "nsXBLService.h"
#undef NOISY_FIRST_LETTER
#include "nsMathMLParts.h"
#include "mozilla/dom/SVGTests.h"
#include "nsSVGUtils.h"
#include "nsRefreshDriver.h"
#include "nsRuleProcessorData.h"
#include "nsTextNode.h"
using namespace mozilla;
using namespace mozilla::dom;
// An alias for convenience.
static const nsIFrame::ChildListID kPrincipalList = nsIFrame::kPrincipalList;
nsIFrame*
NS_NewHTMLCanvasFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewHTMLVideoFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
#include "nsSVGTextContainerFrame.h"
nsIFrame*
NS_NewSVGOuterSVGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGOuterSVGAnonChildFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGInnerSVGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGPathGeometryFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGGenericContainerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGForeignObjectFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGAFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGGlyphFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGSwitchFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGTextFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGTextFrame2(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGTSpanFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGContainerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGUseFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGViewFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
extern nsIFrame*
NS_NewSVGLinearGradientFrame(nsIPresShell *aPresShell, nsStyleContext* aContext);
extern nsIFrame*
NS_NewSVGRadialGradientFrame(nsIPresShell *aPresShell, nsStyleContext* aContext);
extern nsIFrame*
NS_NewSVGStopFrame(nsIPresShell *aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGMarkerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGMarkerAnonChildFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
extern nsIFrame*
NS_NewSVGImageFrame(nsIPresShell *aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGClipPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGTextPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGFilterFrame(nsIPresShell *aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGPatternFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGFEContainerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGFELeafFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGFEImageFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGFEUnstyledLeafFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
#include "nsINodeInfo.h"
#include "prenv.h"
#include "nsNodeInfoManager.h"
#include "nsContentCreatorFunctions.h"
#ifdef DEBUG
// Set the environment variable GECKO_FRAMECTOR_DEBUG_FLAGS to one or
// more of the following flags (comma separated) for handy debug
// output.
static bool gNoisyContentUpdates = false;
static bool gReallyNoisyContentUpdates = false;
static bool gNoisyInlineConstruction = false;
struct FrameCtorDebugFlags {
const char* name;
bool* on;
};
static FrameCtorDebugFlags gFlags[] = {
{ "content-updates", &gNoisyContentUpdates },
{ "really-noisy-content-updates", &gReallyNoisyContentUpdates },
{ "noisy-inline", &gNoisyInlineConstruction }
};
#define NUM_DEBUG_FLAGS (sizeof(gFlags) / sizeof(gFlags[0]))
#endif
#ifdef MOZ_XUL
#include "nsMenuFrame.h"
#include "nsPopupSetFrame.h"
#include "nsTreeColFrame.h"
#include "nsIBoxObject.h"
#include "nsPIListBoxObject.h"
#include "nsListBoxBodyFrame.h"
#include "nsListItemFrame.h"
#include "nsXULLabelFrame.h"
//------------------------------------------------------------------
nsIFrame*
NS_NewAutoRepeatBoxFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewRootBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewDocElementBoxFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewThumbFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewDeckFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewLeafBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewStackFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewProgressMeterFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewRangeFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewImageBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewTextBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewGroupBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewButtonBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSplitterFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewMenuPopupFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewPopupSetFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewMenuFrame (nsIPresShell* aPresShell, nsStyleContext* aContext, uint32_t aFlags);
nsIFrame*
NS_NewMenuBarFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewTreeBodyFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
// grid
nsresult
NS_NewGridLayout2 ( nsIPresShell* aPresShell, nsBoxLayout** aNewLayout );
nsIFrame*
NS_NewGridRowLeafFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewGridRowGroupFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
// end grid
nsIFrame*
NS_NewTitleBarFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewResizerFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
#endif
nsIFrame*
NS_NewHTMLScrollFrame (nsIPresShell* aPresShell, nsStyleContext* aContext, bool aIsRoot);
nsIFrame*
NS_NewXULScrollFrame (nsIPresShell* aPresShell, nsStyleContext* aContext,
bool aIsRoot, bool aClipAllDescendants);
nsIFrame*
NS_NewSliderFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewScrollbarFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewScrollbarButtonFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
#ifdef NOISY_FINDFRAME
static int32_t FFWC_totalCount=0;
static int32_t FFWC_doLoop=0;
static int32_t FFWC_doSibling=0;
static int32_t FFWC_recursions=0;
static int32_t FFWC_nextInFlows=0;
#endif
// Returns true if aFrame is an anonymous flex item
static inline bool
IsAnonymousFlexItem(const nsIFrame* aFrame)
{
const nsIAtom* pseudoType = aFrame->StyleContext()->GetPseudo();
return pseudoType == nsCSSAnonBoxes::anonymousFlexItem;
}
static inline nsIFrame*
GetFieldSetBlockFrame(nsIFrame* aFieldsetFrame)
{
// Depends on the fieldset child frame order - see ConstructFieldSetFrame() below.
nsIFrame* firstChild = aFieldsetFrame->GetFirstPrincipalChild();
return firstChild && firstChild->GetNextSibling() ? firstChild->GetNextSibling() : firstChild;
}
#define FCDATA_DECL(_flags, _func) \
{ _flags, { (FrameCreationFunc)_func }, nullptr, nullptr }
#define FCDATA_WITH_WRAPPING_BLOCK(_flags, _func, _anon_box) \
{ _flags | FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS, \
{ (FrameCreationFunc)_func }, nullptr, &_anon_box }
//----------------------------------------------------------------------
/**
* True if aFrame is an actual inline frame in the sense of non-replaced
* display:inline CSS boxes. In other words, it can be affected by {ib}
* splitting and can contain first-letter frames. Basically, this is either an
* inline frame (positioned or otherwise) or an line frame (this last because
* it can contain first-letter and because inserting blocks in the middle of it
* needs to terminate it).
*/
static bool
IsInlineFrame(const nsIFrame* aFrame)
{
return aFrame->IsFrameOfType(nsIFrame::eLineParticipant);
}
/**
* True if aFrame is an instance of an SVG frame class or is an inline/block
* frame being used for SVG text.
*/
static bool
IsFrameForSVG(const nsIFrame* aFrame)
{
return aFrame->IsFrameOfType(nsIFrame::eSVG) ||
aFrame->IsSVGText();
}
/**
* Returns true iff aFrame explicitly prevents its descendants from floating
* (at least, down to the level of descendants which themselves are
* float-containing blocks -- those will manage the floating status of any
* lower-level descendents inside them, of course).
*/
static bool
ShouldSuppressFloatingOfDescendants(nsIFrame* aFrame)
{
return aFrame->IsFrameOfType(nsIFrame::eMathML) ||
aFrame->IsBoxFrame() ||
aFrame->GetType() == nsGkAtoms::flexContainerFrame;
}
/**
* If any children require a block parent, return the first such child.
* Otherwise return null.
*/
static nsIContent*
AnyKidsNeedBlockParent(nsIFrame *aFrameList)
{
for (nsIFrame *k = aFrameList; k; k = k->GetNextSibling()) {
// Line participants, such as text and inline frames, can't be
// directly inside a XUL box; they must be wrapped in an
// intermediate block.
if (k->IsFrameOfType(nsIFrame::eLineParticipant)) {
return k->GetContent();
}
}
return nullptr;
}
// Reparent a frame into a wrapper frame that is a child of its old parent.
static void
ReparentFrame(RestyleManager* aRestyleManager,
nsIFrame* aNewParentFrame,
nsIFrame* aFrame)
{
aFrame->SetParent(aNewParentFrame);
aRestyleManager->ReparentStyleContext(aFrame);
}
static void
ReparentFrames(nsCSSFrameConstructor* aFrameConstructor,
nsIFrame* aNewParentFrame,
const nsFrameList& aFrameList)
{
RestyleManager* restyleManager = aFrameConstructor->RestyleManager();
for (nsFrameList::Enumerator e(aFrameList); !e.AtEnd(); e.Next()) {
ReparentFrame(restyleManager, aNewParentFrame, e.get());
}
}
//----------------------------------------------------------------------
//
// When inline frames get weird and have block frames in them, we
// annotate them to help us respond to incremental content changes
// more easily.
static inline bool
IsFrameSpecial(nsIFrame* aFrame)
{
return (aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL) != 0;
}
static nsIFrame* GetSpecialSibling(nsIFrame* aFrame)
{
NS_PRECONDITION(IsFrameSpecial(aFrame), "Shouldn't call this");
// We only store the "special sibling" annotation with the first
// frame in the continuation chain. Walk back to find that frame now.
return static_cast<nsIFrame*>
(aFrame->FirstContinuation()->
Properties().Get(nsIFrame::IBSplitSpecialSibling()));
}
static nsIFrame* GetSpecialPrevSibling(nsIFrame* aFrame)
{
NS_PRECONDITION(IsFrameSpecial(aFrame), "Shouldn't call this");
// We only store the "special sibling" annotation with the first
// frame in the continuation chain. Walk back to find that frame now.
return static_cast<nsIFrame*>
(aFrame->FirstContinuation()->
Properties().Get(nsIFrame::IBSplitSpecialPrevSibling()));
}
static nsIFrame*
GetLastSpecialSibling(nsIFrame* aFrame, bool aReturnEmptyTrailingInline)
{
for (nsIFrame *frame = aFrame, *next; ; frame = next) {
next = GetSpecialSibling(frame);
if (!next ||
(!aReturnEmptyTrailingInline && !next->GetFirstPrincipalChild() &&
!GetSpecialSibling(next))) {
NS_ASSERTION(!next || !frame->IsInlineOutside(),
"Should have a block here!");
return frame;
}
}
NS_NOTREACHED("unreachable code");
return nullptr;
}
static void
SetFrameIsSpecial(nsIFrame* aFrame, nsIFrame* aSpecialSibling)
{
NS_PRECONDITION(aFrame, "bad args!");
// We should be the only continuation
NS_ASSERTION(!aFrame->GetPrevContinuation(),
"assigning special sibling to other than first continuation!");
NS_ASSERTION(!aFrame->GetNextContinuation() ||
IsFrameSpecial(aFrame->GetNextContinuation()),
"should have no non-special continuations here");
// Mark the frame as "special".
aFrame->AddStateBits(NS_FRAME_IS_SPECIAL);
if (aSpecialSibling) {
NS_ASSERTION(!aSpecialSibling->GetPrevContinuation(),
"assigning something other than the first continuation as the "
"special sibling");
// Store the "special sibling" (if we were given one) with the
// first frame in the flow.
FramePropertyTable* props = aFrame->PresContext()->PropertyTable();
props->Set(aFrame, nsIFrame::IBSplitSpecialSibling(), aSpecialSibling);
props->Set(aSpecialSibling, nsIFrame::IBSplitSpecialPrevSibling(), aFrame);
}
}
static nsIFrame*
GetIBContainingBlockFor(nsIFrame* aFrame)
{
NS_PRECONDITION(IsFrameSpecial(aFrame),
"GetIBContainingBlockFor() should only be called on known IB frames");
// Get the first "normal" ancestor of the target frame.
nsIFrame* parentFrame;
do {
parentFrame = aFrame->GetParent();
if (! parentFrame) {
NS_ERROR("no unsplit block frame in IB hierarchy");
return aFrame;
}
// Note that we ignore non-special frames which have a pseudo on their
// style context -- they're not the frames we're looking for! In
// particular, they may be hiding a real parent that _is_ special.
if (!IsFrameSpecial(parentFrame) &&
!parentFrame->StyleContext()->GetPseudo())
break;
aFrame = parentFrame;
} while (1);
// post-conditions
NS_ASSERTION(parentFrame, "no normal ancestor found for special frame in GetIBContainingBlockFor");
NS_ASSERTION(parentFrame != aFrame, "parentFrame is actually the child frame - bogus reslt");
return parentFrame;
}
//----------------------------------------------------------------------
// Block/inline frame construction logic. We maintain a few invariants here:
//
// 1. Block frames contain block and inline frames.
//
// 2. Inline frames only contain inline frames. If an inline parent has a block
// child then the block child is migrated upward until it lands in a block
// parent (the inline frames containing block is where it will end up).
// After this function returns, aLink is pointing to the first link at or
// after its starting position for which the next frame is a block. If there
// is no such link, it points to the end of the list.
static void
FindFirstBlock(nsFrameList::FrameLinkEnumerator& aLink)
{
for ( ; !aLink.AtEnd(); aLink.Next()) {
if (!aLink.NextFrame()->IsInlineOutside()) {
return;
}
}
}
// This function returns a frame link enumerator pointing to the first link in
// the list for which the next frame is not block. If there is no such link,
// it points to the end of the list.
static nsFrameList::FrameLinkEnumerator
FindFirstNonBlock(const nsFrameList& aList)
{
nsFrameList::FrameLinkEnumerator link(aList);
for (; !link.AtEnd(); link.Next()) {
if (link.NextFrame()->IsInlineOutside()) {
break;
}
}
return link;
}
inline void
SetInitialSingleChild(nsIFrame* aParent, nsIFrame* aFrame)
{
NS_PRECONDITION(!aFrame->GetNextSibling(), "Should be using a frame list");
nsFrameList temp(aFrame, aFrame);
aParent->SetInitialChildList(kPrincipalList, temp);
}
// -----------------------------------------------------------
// Structure used when constructing formatting object trees.
struct nsFrameItems : public nsFrameList
{
// Appends the frame to the end of the list
void AddChild(nsIFrame* aChild);
};
void
nsFrameItems::AddChild(nsIFrame* aChild)
{
NS_PRECONDITION(aChild, "nsFrameItems::AddChild");
// It'd be really nice if we could just AppendFrames(kPrincipalList, aChild) here,
// but some of our callers put frames that have different
// parents (caption, I'm looking at you) on the same framelist, and
// nsFrameList asserts if you try to do that.
if (IsEmpty()) {
SetFrames(aChild);
}
else {
NS_ASSERTION(aChild != mLastChild,
"Same frame being added to frame list twice?");
mLastChild->SetNextSibling(aChild);
mLastChild = nsLayoutUtils::GetLastSibling(aChild);
}
}
// -----------------------------------------------------------
// Structure used when constructing formatting object trees. Contains
// state information needed for absolutely positioned elements
struct nsAbsoluteItems : nsFrameItems {
// containing block for absolutely positioned elements
nsIFrame* containingBlock;
nsAbsoluteItems(nsIFrame* aContainingBlock);
#ifdef DEBUG
// XXXbz Does this need a debug-only assignment operator that nulls out the
// childList in the nsAbsoluteItems we're copying? Introducing a difference
// between debug and non-debug behavior seems bad, so I guess not...
~nsAbsoluteItems() {
NS_ASSERTION(!FirstChild(),
"Dangling child list. Someone forgot to insert it?");
}
#endif
// Appends the frame to the end of the list
void AddChild(nsIFrame* aChild);
};
nsAbsoluteItems::nsAbsoluteItems(nsIFrame* aContainingBlock)
: containingBlock(aContainingBlock)
{
}
// Additional behavior is that it sets the frame's NS_FRAME_OUT_OF_FLOW flag
void
nsAbsoluteItems::AddChild(nsIFrame* aChild)
{
NS_ASSERTION(aChild->PresContext()->FrameManager()->
GetPlaceholderFrameFor(aChild),
"Child without placeholder being added to nsAbsoluteItems?");
aChild->AddStateBits(NS_FRAME_OUT_OF_FLOW);
nsFrameItems::AddChild(aChild);
}
// -----------------------------------------------------------
// Structure for saving the existing state when pushing/poping containing
// blocks. The destructor restores the state to its previous state
class MOZ_STACK_CLASS nsFrameConstructorSaveState {
public:
typedef nsIFrame::ChildListID ChildListID;
nsFrameConstructorSaveState();
~nsFrameConstructorSaveState();
private:
nsAbsoluteItems* mItems; // pointer to struct whose data we save/restore
nsAbsoluteItems mSavedItems; // copy of original data
// The name of the child list in which our frames would belong
ChildListID mChildListID;
nsFrameConstructorState* mState;
// State used only when we're saving the abs-pos state for a transformed
// element.
nsAbsoluteItems mSavedFixedItems;
bool mSavedFixedPosIsAbsPos;
friend class nsFrameConstructorState;
};
// Structure used to keep track of a list of bindings we need to call
// AddToAttachedQueue on. These should be in post-order depth-first
// flattened tree traversal order.
struct PendingBinding : public LinkedListElement<PendingBinding>
{
#ifdef NS_BUILD_REFCNT_LOGGING
PendingBinding() {
MOZ_COUNT_CTOR(PendingBinding);
}
~PendingBinding() {
MOZ_COUNT_DTOR(PendingBinding);
}
#endif
nsRefPtr<nsXBLBinding> mBinding;
};
// Structure used for maintaining state information during the
// frame construction process
class MOZ_STACK_CLASS nsFrameConstructorState {
public:
typedef nsIFrame::ChildListID ChildListID;
nsPresContext *mPresContext;
nsIPresShell *mPresShell;
nsFrameManager *mFrameManager;
#ifdef MOZ_XUL
// Frames destined for the kPopupList.
nsAbsoluteItems mPopupItems;
#endif
// Containing block information for out-of-flow frames.
nsAbsoluteItems mFixedItems;
nsAbsoluteItems mAbsoluteItems;
nsAbsoluteItems mFloatedItems;
nsCOMPtr<nsILayoutHistoryState> mFrameState;
// These bits will be added to the state bits of any frame we construct
// using this state.
nsFrameState mAdditionalStateBits;
// When working with the -moz-transform property, we want to hook
// the abs-pos and fixed-pos lists together, since transformed
// elements are fixed-pos containing blocks. This flag determines
// whether or not we want to wire the fixed-pos and abs-pos lists
// together.
bool mFixedPosIsAbsPos;
// A boolean to indicate whether we have a "pending" popupgroup. That is, we
// have already created the FrameConstructionItem for the root popupgroup but
// we have not yet created the relevant frame.
bool mHavePendingPopupgroup;
// If false (which is the default) then call SetPrimaryFrame() as needed
// during frame construction. If true, don't make any SetPrimaryFrame()
// calls, except for generated content which doesn't have a primary frame
// yet. The mCreatingExtraFrames == true mode is meant to be used for
// construction of random "extra" frames for elements via normal frame
// construction APIs (e.g. replication of things across pages in paginated
// mode).
bool mCreatingExtraFrames;
nsCOMArray<nsIContent> mGeneratedTextNodesWithInitializer;
TreeMatchContext mTreeMatchContext;
// Constructor
// Use the passed-in history state.
nsFrameConstructorState(nsIPresShell* aPresShell,
nsIFrame* aFixedContainingBlock,
nsIFrame* aAbsoluteContainingBlock,
nsIFrame* aFloatContainingBlock,
nsILayoutHistoryState* aHistoryState);
// Get the history state from the pres context's pres shell.
nsFrameConstructorState(nsIPresShell* aPresShell,
nsIFrame* aFixedContainingBlock,
nsIFrame* aAbsoluteContainingBlock,
nsIFrame* aFloatContainingBlock);
~nsFrameConstructorState();
// Function to push the existing absolute containing block state and
// create a new scope. Code that uses this function should get matching
// logic in GetAbsoluteContainingBlock.
// Also makes aNewAbsoluteContainingBlock the containing block for
// fixed-pos elements if necessary.
// aPositionedFrame is the frame whose style actually makes
// aNewAbsoluteContainingBlock a containing block. E.g. for a scrollable element
// aPositionedFrame is the element's primary frame and
// aNewAbsoluteContainingBlock is the scrolled frame.
void PushAbsoluteContainingBlock(nsIFrame* aNewAbsoluteContainingBlock,
nsIFrame* aPositionedFrame,
nsFrameConstructorSaveState& aSaveState);
// Function to push the existing float containing block state and
// create a new scope. Code that uses this function should get matching
// logic in GetFloatContainingBlock.
// Pushing a null float containing block forbids any frames from being
// floated until a new float containing block is pushed.
// XXX we should get rid of null float containing blocks and teach the
// various frame classes to deal with floats instead.
void PushFloatContainingBlock(nsIFrame* aNewFloatContainingBlock,
nsFrameConstructorSaveState& aSaveState);
// Function to return the proper geometric parent for a frame with display
// struct given by aStyleDisplay and parent's frame given by
// aContentParentFrame.
nsIFrame* GetGeometricParent(const nsStyleDisplay* aStyleDisplay,
nsIFrame* aContentParentFrame) const;
/**
* Function to add a new frame to the right frame list. This MUST be called
* on frames before their children have been processed if the frames might
* conceivably be out-of-flow; otherwise cleanup in error cases won't work
* right. Also, this MUST be called on frames after they have been
* initialized.
* @param aNewFrame the frame to add
* @param aFrameItems the list to add in-flow frames to
* @param aContent the content pointer for aNewFrame
* @param aStyleContext the style context resolved for aContent
* @param aParentFrame the parent frame for the content if it were in-flow
* @param aCanBePositioned pass false if the frame isn't allowed to be
* positioned
* @param aCanBeFloated pass false if the frame isn't allowed to be
* floated
* @param aIsOutOfFlowPopup pass true if the frame is an out-of-flow popup
* (XUL-only)
*/
void AddChild(nsIFrame* aNewFrame,
nsFrameItems& aFrameItems,
nsIContent* aContent,
nsStyleContext* aStyleContext,
nsIFrame* aParentFrame,
bool aCanBePositioned = true,
bool aCanBeFloated = true,
bool aIsOutOfFlowPopup = false,
bool aInsertAfter = false,
nsIFrame* aInsertAfterFrame = nullptr);
/**
* Function to return the fixed-pos element list. Normally this will just hand back the
* fixed-pos element list, but in case we're dealing with a transformed element that's
* acting as an abs-pos and fixed-pos container, we'll hand back the abs-pos list. Callers should
* use this function if they want to get the list acting as the fixed-pos item parent.
*/
nsAbsoluteItems& GetFixedItems()
{
return mFixedPosIsAbsPos ? mAbsoluteItems : mFixedItems;
}
const nsAbsoluteItems& GetFixedItems() const
{
return mFixedPosIsAbsPos ? mAbsoluteItems : mFixedItems;
}
/**
* class to automatically push and pop a pending binding in the frame
* constructor state. See nsCSSFrameConstructor::FrameConstructionItem
* mPendingBinding documentation.
*/
class PendingBindingAutoPusher;
friend class PendingBindingAutoPusher;
class MOZ_STACK_CLASS PendingBindingAutoPusher {
public:
PendingBindingAutoPusher(nsFrameConstructorState& aState,
PendingBinding* aPendingBinding) :
mState(aState),
mPendingBinding(aState.mCurrentPendingBindingInsertionPoint)
{
if (aPendingBinding) {
aState.mCurrentPendingBindingInsertionPoint = aPendingBinding;
}
}
~PendingBindingAutoPusher()
{
mState.mCurrentPendingBindingInsertionPoint = mPendingBinding;
}
private:
nsFrameConstructorState& mState;
PendingBinding* mPendingBinding;
};
/**
* Add a new pending binding to the list
*/
void AddPendingBinding(PendingBinding* aPendingBinding) {
if (mCurrentPendingBindingInsertionPoint) {
mCurrentPendingBindingInsertionPoint->setPrevious(aPendingBinding);
} else {
mPendingBindings.insertBack(aPendingBinding);
}
}
protected:
friend class nsFrameConstructorSaveState;
/**
* ProcessFrameInsertions takes the frames in aFrameItems and adds them as
* kids to the aChildListID child list of |aFrameItems.containingBlock|.
*/
void ProcessFrameInsertions(nsAbsoluteItems& aFrameItems,
ChildListID aChildListID);
// Our list of all pending bindings. When we're done, we need to call
// AddToAttachedQueue on all of them, in order.
LinkedList<PendingBinding> mPendingBindings;
PendingBinding* mCurrentPendingBindingInsertionPoint;
};
nsFrameConstructorState::nsFrameConstructorState(nsIPresShell* aPresShell,
nsIFrame* aFixedContainingBlock,
nsIFrame* aAbsoluteContainingBlock,
nsIFrame* aFloatContainingBlock,
nsILayoutHistoryState* aHistoryState)
: mPresContext(aPresShell->GetPresContext()),
mPresShell(aPresShell),
mFrameManager(aPresShell->FrameManager()),
#ifdef MOZ_XUL
mPopupItems(nullptr),
#endif
mFixedItems(aFixedContainingBlock),
mAbsoluteItems(aAbsoluteContainingBlock),
mFloatedItems(aFloatContainingBlock),
// See PushAbsoluteContaningBlock below
mFrameState(aHistoryState),
mAdditionalStateBits(0),
// If the fixed-pos containing block is equal to the abs-pos containing
// block, use the abs-pos containing block's abs-pos list for fixed-pos
// frames.
mFixedPosIsAbsPos(aFixedContainingBlock == aAbsoluteContainingBlock),
mHavePendingPopupgroup(false),
mCreatingExtraFrames(false),
mTreeMatchContext(true, nsRuleWalker::eRelevantLinkUnvisited,
aPresShell->GetDocument()),
mCurrentPendingBindingInsertionPoint(nullptr)
{
#ifdef MOZ_XUL
nsIRootBox* rootBox = nsIRootBox::GetRootBox(aPresShell);
if (rootBox) {
mPopupItems.containingBlock = rootBox->GetPopupSetFrame();
}
#endif
MOZ_COUNT_CTOR(nsFrameConstructorState);
}
nsFrameConstructorState::nsFrameConstructorState(nsIPresShell* aPresShell,
nsIFrame* aFixedContainingBlock,
nsIFrame* aAbsoluteContainingBlock,
nsIFrame* aFloatContainingBlock)
: mPresContext(aPresShell->GetPresContext()),
mPresShell(aPresShell),
mFrameManager(aPresShell->FrameManager()),
#ifdef MOZ_XUL
mPopupItems(nullptr),
#endif
mFixedItems(aFixedContainingBlock),
mAbsoluteItems(aAbsoluteContainingBlock),
mFloatedItems(aFloatContainingBlock),
// See PushAbsoluteContaningBlock below
mAdditionalStateBits(0),
// If the fixed-pos containing block is equal to the abs-pos containing
// block, use the abs-pos containing block's abs-pos list for fixed-pos
// frames.
mFixedPosIsAbsPos(aFixedContainingBlock == aAbsoluteContainingBlock),
mHavePendingPopupgroup(false),
mCreatingExtraFrames(false),
mTreeMatchContext(true, nsRuleWalker::eRelevantLinkUnvisited,
aPresShell->GetDocument()),
mCurrentPendingBindingInsertionPoint(nullptr)
{
#ifdef MOZ_XUL
nsIRootBox* rootBox = nsIRootBox::GetRootBox(aPresShell);
if (rootBox) {
mPopupItems.containingBlock = rootBox->GetPopupSetFrame();
}
#endif
MOZ_COUNT_CTOR(nsFrameConstructorState);
mFrameState = aPresShell->GetDocument()->GetLayoutHistoryState();
}
nsFrameConstructorState::~nsFrameConstructorState()
{
// Frame order comparison functions only work properly when the placeholders
// have been inserted into the frame tree. So for example if we have a new float
// containing the placeholder for a new abs-pos frame, and we process the abs-pos
// insertion first, then we won't be able to find the right place to insert in
// in the abs-pos list. So put floats in first, because they can contain placeholders
// for abs-pos and fixed-pos items whose containing blocks are outside the floats.
// Then put abs-pos frames in, because they can contain placeholders for fixed-pos
// items whose containing block is outside the abs-pos frames.
MOZ_COUNT_DTOR(nsFrameConstructorState);
ProcessFrameInsertions(mFloatedItems, nsIFrame::kFloatList);
ProcessFrameInsertions(mAbsoluteItems, nsIFrame::kAbsoluteList);
ProcessFrameInsertions(mFixedItems, nsIFrame::kFixedList);
#ifdef MOZ_XUL
ProcessFrameInsertions(mPopupItems, nsIFrame::kPopupList);
#endif
for (int32_t i = mGeneratedTextNodesWithInitializer.Count() - 1; i >= 0; --i) {
mGeneratedTextNodesWithInitializer[i]->
DeleteProperty(nsGkAtoms::genConInitializerProperty);
}
if (!mPendingBindings.isEmpty()) {
nsBindingManager* bindingManager = mPresShell->GetDocument()->BindingManager();
do {
nsAutoPtr<PendingBinding> pendingBinding;
pendingBinding = mPendingBindings.popFirst();
bindingManager->AddToAttachedQueue(pendingBinding->mBinding);
} while (!mPendingBindings.isEmpty());
mCurrentPendingBindingInsertionPoint = nullptr;
}
}
static nsIFrame*
AdjustAbsoluteContainingBlock(nsIFrame* aContainingBlockIn)
{
if (!aContainingBlockIn) {
return nullptr;
}
// Always use the container's first continuation. (Inline frames can have
// non-fluid bidi continuations...)
return aContainingBlockIn->FirstContinuation();
}
void
nsFrameConstructorState::PushAbsoluteContainingBlock(nsIFrame* aNewAbsoluteContainingBlock,
nsIFrame* aPositionedFrame,
nsFrameConstructorSaveState& aSaveState)
{
aSaveState.mItems = &mAbsoluteItems;
aSaveState.mSavedItems = mAbsoluteItems;
aSaveState.mChildListID = nsIFrame::kAbsoluteList;
aSaveState.mState = this;
aSaveState.mSavedFixedPosIsAbsPos = mFixedPosIsAbsPos;
if (mFixedPosIsAbsPos) {
// Since we're going to replace mAbsoluteItems, we need to save it into
// mFixedItems now (and save the current value of mFixedItems).
aSaveState.mSavedFixedItems = mFixedItems;
mFixedItems = mAbsoluteItems;
}
mAbsoluteItems =
nsAbsoluteItems(AdjustAbsoluteContainingBlock(aNewAbsoluteContainingBlock));
/* See if we're wiring the fixed-pos and abs-pos lists together. This happens iff
* we're a transformed element.
*/
mFixedPosIsAbsPos = aPositionedFrame &&
aPositionedFrame->StyleDisplay()->HasTransform(aPositionedFrame);
if (aNewAbsoluteContainingBlock) {
aNewAbsoluteContainingBlock->MarkAsAbsoluteContainingBlock();
}
}
void
nsFrameConstructorState::PushFloatContainingBlock(nsIFrame* aNewFloatContainingBlock,
nsFrameConstructorSaveState& aSaveState)
{
NS_PRECONDITION(!aNewFloatContainingBlock ||
aNewFloatContainingBlock->IsFloatContainingBlock(),
"Please push a real float containing block!");
NS_ASSERTION(!aNewFloatContainingBlock ||
!ShouldSuppressFloatingOfDescendants(aNewFloatContainingBlock),
"We should not push a frame that is supposed to _suppress_ "
"floats as a float containing block!");
aSaveState.mItems = &mFloatedItems;
aSaveState.mSavedItems = mFloatedItems;
aSaveState.mChildListID = nsIFrame::kFloatList;
aSaveState.mState = this;
mFloatedItems = nsAbsoluteItems(aNewFloatContainingBlock);
}
nsIFrame*
nsFrameConstructorState::GetGeometricParent(const nsStyleDisplay* aStyleDisplay,
nsIFrame* aContentParentFrame) const
{
NS_PRECONDITION(aStyleDisplay, "Must have display struct!");
// If there is no container for a fixed, absolute, or floating root
// frame, we will ignore the positioning. This hack is originally
// brought to you by the letter T: tables, since other roots don't
// even call into this code. See bug 178855.
//
// XXX Disabling positioning in this case is a hack. If one was so inclined,
// one could support this either by (1) inserting a dummy block between the
// table and the canvas or (2) teaching the canvas how to reflow positioned
// elements. (1) has the usual problems when multiple frames share the same
// content (notice all the special cases in this file dealing with inner
// tables and outer tables which share the same content). (2) requires some
// work and possible factoring.
//
// XXXbz couldn't we just force position to "static" on roots and
// float to "none"? That's OK per CSS 2.1, as far as I can tell.
if (aContentParentFrame && aContentParentFrame->IsSVGText()) {
return aContentParentFrame;
}
if (aStyleDisplay->IsFloatingStyle() && mFloatedItems.containingBlock) {
NS_ASSERTION(!aStyleDisplay->IsAbsolutelyPositionedStyle(),
"Absolutely positioned _and_ floating?");
return mFloatedItems.containingBlock;
}
if (aStyleDisplay->mPosition == NS_STYLE_POSITION_ABSOLUTE &&
mAbsoluteItems.containingBlock) {
return mAbsoluteItems.containingBlock;
}
if (aStyleDisplay->mPosition == NS_STYLE_POSITION_FIXED &&
GetFixedItems().containingBlock) {
return GetFixedItems().containingBlock;
}
return aContentParentFrame;
}
void
nsFrameConstructorState::AddChild(nsIFrame* aNewFrame,
nsFrameItems& aFrameItems,
nsIContent* aContent,
nsStyleContext* aStyleContext,
nsIFrame* aParentFrame,
bool aCanBePositioned,
bool aCanBeFloated,
bool aIsOutOfFlowPopup,
bool aInsertAfter,
nsIFrame* aInsertAfterFrame)
{
NS_PRECONDITION(!aNewFrame->GetNextSibling(), "Shouldn't happen");
const nsStyleDisplay* disp = aNewFrame->StyleDisplay();
// The comments in GetGeometricParent regarding root table frames
// all apply here, unfortunately.
bool needPlaceholder = false;
nsFrameState placeholderType;
nsFrameItems* frameItems = &aFrameItems;
#ifdef MOZ_XUL
if (MOZ_UNLIKELY(aIsOutOfFlowPopup)) {
NS_ASSERTION(aNewFrame->GetParent() == mPopupItems.containingBlock,
"Popup whose parent is not the popup containing block?");
NS_ASSERTION(mPopupItems.containingBlock, "Must have a popup set frame!");
needPlaceholder = true;
frameItems = &mPopupItems;
placeholderType = PLACEHOLDER_FOR_POPUP;
}
else
#endif // MOZ_XUL
if (aCanBeFloated && aNewFrame->IsFloating() &&
mFloatedItems.containingBlock) {
NS_ASSERTION(aNewFrame->GetParent() == mFloatedItems.containingBlock,
"Float whose parent is not the float containing block?");
needPlaceholder = true;
frameItems = &mFloatedItems;
placeholderType = PLACEHOLDER_FOR_FLOAT;
}
else if (aCanBePositioned) {
if (disp->mPosition == NS_STYLE_POSITION_ABSOLUTE &&
mAbsoluteItems.containingBlock) {
NS_ASSERTION(aNewFrame->GetParent() == mAbsoluteItems.containingBlock,
"Abs pos whose parent is not the abs pos containing block?");
needPlaceholder = true;
frameItems = &mAbsoluteItems;
placeholderType = PLACEHOLDER_FOR_ABSPOS;
}
if (disp->mPosition == NS_STYLE_POSITION_FIXED &&
GetFixedItems().containingBlock) {
NS_ASSERTION(aNewFrame->GetParent() == GetFixedItems().containingBlock,
"Fixed pos whose parent is not the fixed pos containing block?");
needPlaceholder = true;
frameItems = &GetFixedItems();
placeholderType = PLACEHOLDER_FOR_FIXEDPOS;
}
}
if (needPlaceholder) {
NS_ASSERTION(frameItems != &aFrameItems,
"Putting frame in-flow _and_ want a placeholder?");
nsIFrame* placeholderFrame =
nsCSSFrameConstructor::CreatePlaceholderFrameFor(mPresShell,
aContent,
aNewFrame,
aStyleContext,
aParentFrame,
nullptr,
placeholderType);
placeholderFrame->AddStateBits(mAdditionalStateBits);
// Add the placeholder frame to the flow
aFrameItems.AddChild(placeholderFrame);
}
#ifdef DEBUG
else {
NS_ASSERTION(aNewFrame->GetParent() == aParentFrame,
"In-flow frame has wrong parent");
}
#endif
if (aInsertAfter) {
frameItems->InsertFrame(nullptr, aInsertAfterFrame, aNewFrame);
} else {
frameItems->AddChild(aNewFrame);
}
}
void
nsFrameConstructorState::ProcessFrameInsertions(nsAbsoluteItems& aFrameItems,
ChildListID aChildListID)
{
#define NS_NONXUL_LIST_TEST (&aFrameItems == &mFloatedItems && \
aChildListID == nsIFrame::kFloatList) || \
(&aFrameItems == &mAbsoluteItems && \
aChildListID == nsIFrame::kAbsoluteList) || \
(&aFrameItems == &mFixedItems && \
aChildListID == nsIFrame::kFixedList)
#ifdef MOZ_XUL
NS_PRECONDITION(NS_NONXUL_LIST_TEST ||
(&aFrameItems == &mPopupItems &&
aChildListID == nsIFrame::kPopupList),
"Unexpected aFrameItems/aChildListID combination");
#else
NS_PRECONDITION(NS_NONXUL_LIST_TEST,
"Unexpected aFrameItems/aChildListID combination");
#endif
if (aFrameItems.IsEmpty()) {
return;
}
nsIFrame* containingBlock = aFrameItems.containingBlock;
NS_ASSERTION(containingBlock,
"Child list without containing block?");
if (aChildListID == nsIFrame::kFixedList) {
// Put this frame on the transformed-frame's abs-pos list instead, if
// it has abs-pos children instead of fixed-pos children.
aChildListID = containingBlock->GetAbsoluteListID();
}
// Insert the frames hanging out in aItems. We can use SetInitialChildList()
// if the containing block hasn't been reflowed yet (so NS_FRAME_FIRST_REFLOW
// is set) and doesn't have any frames in the aChildListID child list yet.
const nsFrameList& childList = containingBlock->GetChildList(aChildListID);
DebugOnly<nsresult> rv = NS_OK;
if (childList.IsEmpty() &&
(containingBlock->GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
// If we're injecting absolutely positioned frames, inject them on the
// absolute containing block
if (aChildListID == containingBlock->GetAbsoluteListID()) {
rv = containingBlock->GetAbsoluteContainingBlock()->
SetInitialChildList(containingBlock, aChildListID, aFrameItems);
} else {
rv = containingBlock->SetInitialChildList(aChildListID, aFrameItems);
}
} else {
// Note that whether the frame construction context is doing an append or
// not is not helpful here, since it could be appending to some frame in
// the middle of the document, which means we're not necessarily
// appending to the children of the containing block.
//
// We need to make sure the 'append to the end of document' case is fast.
// So first test the last child of the containing block
nsIFrame* lastChild = childList.LastChild();
// CompareTreePosition uses placeholder hierarchy for out of flow frames,
// so this will make out-of-flows respect the ordering of placeholders,
// which is great because it takes care of anonymous content.
nsIFrame* firstNewFrame = aFrameItems.FirstChild();
// Cache the ancestor chain so that we can reuse it if needed.
nsAutoTArray<nsIFrame*, 20> firstNewFrameAncestors;
nsIFrame* notCommonAncestor = nullptr;
if (lastChild) {
notCommonAncestor = nsLayoutUtils::FillAncestors(firstNewFrame,
containingBlock,
&firstNewFrameAncestors);
}
if (!lastChild ||
nsLayoutUtils::CompareTreePosition(lastChild, firstNewFrame,
firstNewFrameAncestors,
notCommonAncestor ?
containingBlock : nullptr) < 0) {
// no lastChild, or lastChild comes before the new children, so just append
rv = mFrameManager->AppendFrames(containingBlock, aChildListID, aFrameItems);
} else {
// Try the other children. First collect them to an array so that a
// reasonable fast binary search can be used to find the insertion point.
nsAutoTArray<nsIFrame*, 128> children;
for (nsIFrame* f = childList.FirstChild(); f != lastChild;
f = f->GetNextSibling()) {
children.AppendElement(f);
}
nsIFrame* insertionPoint = nullptr;
int32_t imin = 0;
int32_t max = children.Length();
while (max > imin) {
int32_t imid = imin + ((max - imin) / 2);
nsIFrame* f = children[imid];
int32_t compare =
nsLayoutUtils::CompareTreePosition(f, firstNewFrame, firstNewFrameAncestors,
notCommonAncestor ? containingBlock : nullptr);
if (compare > 0) {
// f is after the new frame.
max = imid;
insertionPoint = imid > 0 ? children[imid - 1] : nullptr;
} else if (compare < 0) {
// f is before the new frame.
imin = imid + 1;
insertionPoint = f;
} else {
// This is for the old behavior. Should be removed once it is
// guaranteed that CompareTreePosition can't return 0!
// See bug 928645.
NS_WARNING("Something odd happening???");
insertionPoint = nullptr;
for (uint32_t i = 0; i < children.Length(); ++i) {
nsIFrame* f = children[i];
if (nsLayoutUtils::CompareTreePosition(f, firstNewFrame,
firstNewFrameAncestors,
notCommonAncestor ?
containingBlock : nullptr) > 0) {
break;
}
insertionPoint = f;
}
break;
}
}
rv = mFrameManager->InsertFrames(containingBlock, aChildListID,
insertionPoint, aFrameItems);
}
}
NS_POSTCONDITION(aFrameItems.IsEmpty(), "How did that happen?");
// XXXbz And if NS_FAILED(rv), what? I guess we need to clean up the list
// and deal with all the placeholders... but what if the placeholders aren't
// in the document yet? Could that happen?
NS_ASSERTION(NS_SUCCEEDED(rv), "Frames getting lost!");
}
nsFrameConstructorSaveState::nsFrameConstructorSaveState()
: mItems(nullptr),
mSavedItems(nullptr),
mChildListID(kPrincipalList),
mState(nullptr),
mSavedFixedItems(nullptr),
mSavedFixedPosIsAbsPos(false)
{
}
nsFrameConstructorSaveState::~nsFrameConstructorSaveState()
{
// Restore the state
if (mItems) {
NS_ASSERTION(mState, "Can't have mItems set without having a state!");
mState->ProcessFrameInsertions(*mItems, mChildListID);
*mItems = mSavedItems;
#ifdef DEBUG
// We've transferred the child list, so drop the pointer we held to it.
// Note that this only matters for the assert in ~nsAbsoluteItems.
mSavedItems.Clear();
#endif
if (mItems == &mState->mAbsoluteItems) {
mState->mFixedPosIsAbsPos = mSavedFixedPosIsAbsPos;
if (mSavedFixedPosIsAbsPos) {
// mAbsoluteItems was moved to mFixedItems, so move mFixedItems back
// and repair the old mFixedItems now.
mState->mAbsoluteItems = mState->mFixedItems;
mState->mFixedItems = mSavedFixedItems;
#ifdef DEBUG
mSavedFixedItems.Clear();
#endif
}
}
NS_ASSERTION(!mItems->LastChild() || !mItems->LastChild()->GetNextSibling(),
"Something corrupted our list");
}
}
static
bool IsBorderCollapse(nsIFrame* aFrame)
{
for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) {
if (nsGkAtoms::tableFrame == frame->GetType()) {
return ((nsTableFrame*)frame)->IsBorderCollapse();
}
}
NS_ASSERTION(false, "program error");
return false;
}
/**
* Moves aFrameList from aOldParent to aNewParent. This updates the parent
* pointer of the frames in the list, and reparents their views as needed.
* nsFrame::SetParent sets the NS_FRAME_HAS_VIEW bit on aNewParent and its
* ancestors as needed. Then it sets the list as the initial child list
* on aNewParent, unless aNewParent either already has kids or has been
* reflowed; in that case it appends the new frames. Note that this
* method differs from ReparentFrames in that it doesn't change the kids'
* style contexts.
*/
// XXXbz Since this is only used for {ib} splits, could we just copy the view
// bits from aOldParent to aNewParent and then use the
// nsFrameList::ApplySetParent? That would still leave us doing two passes
// over the list, of course; if we really wanted to we could factor out the
// relevant part of ReparentFrameViewList, I suppose... Or just get rid of
// views, which would make most of this function go away.
static void
MoveChildrenTo(nsPresContext* aPresContext,
nsIFrame* aOldParent,
nsIFrame* aNewParent,
nsFrameList& aFrameList)
{
bool sameGrandParent = aOldParent->GetParent() == aNewParent->GetParent();
if (aNewParent->HasView() || aOldParent->HasView() || !sameGrandParent) {
// Move the frames into the new view
nsContainerFrame::ReparentFrameViewList(aPresContext, aFrameList,
aOldParent, aNewParent);
}
for (nsFrameList::Enumerator e(aFrameList); !e.AtEnd(); e.Next()) {
e.get()->SetParent(aNewParent);
}
if (aNewParent->PrincipalChildList().IsEmpty() &&
(aNewParent->GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
aNewParent->SetInitialChildList(kPrincipalList, aFrameList);
} else {
aNewParent->AppendFrames(kPrincipalList, aFrameList);
}
}
//----------------------------------------------------------------------
nsCSSFrameConstructor::nsCSSFrameConstructor(nsIDocument *aDocument,
nsIPresShell *aPresShell,
nsStyleSet* aStyleSet)
: nsFrameManager(aPresShell, aStyleSet)
, mDocument(aDocument)
, mRootElementFrame(nullptr)
, mRootElementStyleFrame(nullptr)
, mFixedContainingBlock(nullptr)
, mDocElementContainingBlock(nullptr)
, mGfxScrollFrame(nullptr)
, mPageSequenceFrame(nullptr)
, mCurrentDepth(0)
, mUpdateCount(0)
, mQuotesDirty(false)
, mCountersDirty(false)
, mIsDestroyingFrameTree(false)
, mHasRootAbsPosContainingBlock(false)
{
#ifdef DEBUG
static bool gFirstTime = true;
if (gFirstTime) {
gFirstTime = false;
char* flags = PR_GetEnv("GECKO_FRAMECTOR_DEBUG_FLAGS");
if (flags) {
bool error = false;
for (;;) {
char* comma = PL_strchr(flags, ',');
if (comma)
*comma = '\0';
bool found = false;
FrameCtorDebugFlags* flag = gFlags;
FrameCtorDebugFlags* limit = gFlags + NUM_DEBUG_FLAGS;
while (flag < limit) {
if (PL_strcasecmp(flag->name, flags) == 0) {
*(flag->on) = true;
printf("nsCSSFrameConstructor: setting %s debug flag on\n", flag->name);
found = true;
break;
}
++flag;
}
if (! found)
error = true;
if (! comma)
break;
*comma = ',';
flags = comma + 1;
}
if (error) {
printf("Here are the available GECKO_FRAMECTOR_DEBUG_FLAGS:\n");
FrameCtorDebugFlags* flag = gFlags;
FrameCtorDebugFlags* limit = gFlags + NUM_DEBUG_FLAGS;
while (flag < limit) {
printf(" %s\n", flag->name);
++flag;
}
printf("Note: GECKO_FRAMECTOR_DEBUG_FLAGS is a comma separated list of flag\n");
printf("names (no whitespace)\n");
}
}
}
#endif
}
void
nsCSSFrameConstructor::NotifyDestroyingFrame(nsIFrame* aFrame)
{
NS_PRECONDITION(mUpdateCount != 0,
"Should be in an update while destroying frames");
if (aFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT) {
if (mQuoteList.DestroyNodesFor(aFrame))
QuotesDirty();
}
if (mCounterManager.DestroyNodesFor(aFrame)) {
// Technically we don't need to update anything if we destroyed only
// USE nodes. However, this is unlikely to happen in the real world
// since USE nodes generally go along with INCREMENT nodes.
CountersDirty();
}
RestyleManager()->NotifyDestroyingFrame(aFrame);
nsFrameManager::NotifyDestroyingFrame(aFrame);
}
struct nsGenConInitializer {
nsAutoPtr<nsGenConNode> mNode;
nsGenConList* mList;
void (nsCSSFrameConstructor::*mDirtyAll)();
nsGenConInitializer(nsGenConNode* aNode, nsGenConList* aList,
void (nsCSSFrameConstructor::*aDirtyAll)())
: mNode(aNode), mList(aList), mDirtyAll(aDirtyAll) {}
};
static void
DestroyGenConInitializer(void* aFrame,
nsIAtom* aPropertyName,
void* aPropertyValue,
void* aDtorData)
{
delete static_cast<nsGenConInitializer*>(aPropertyValue);
}
already_AddRefed<nsIContent>
nsCSSFrameConstructor::CreateGenConTextNode(nsFrameConstructorState& aState,
const nsString& aString,
nsCOMPtr<nsIDOMCharacterData>* aText,
nsGenConInitializer* aInitializer)
{
nsRefPtr<nsTextNode> content = new nsTextNode(mDocument->NodeInfoManager());
content->SetText(aString, false);
if (aText) {
*aText = content;
}
if (aInitializer) {
content->SetProperty(nsGkAtoms::genConInitializerProperty, aInitializer,
DestroyGenConInitializer);
aState.mGeneratedTextNodesWithInitializer.AppendObject(content);
}
return content.forget();
}
already_AddRefed<nsIContent>
nsCSSFrameConstructor::CreateGeneratedContent(nsFrameConstructorState& aState,
nsIContent* aParentContent,
nsStyleContext* aStyleContext,
uint32_t aContentIndex)
{
// Get the content value
const nsStyleContentData &data =
aStyleContext->StyleContent()->ContentAt(aContentIndex);
nsStyleContentType type = data.mType;
if (eStyleContentType_Image == type) {
if (!data.mContent.mImage) {
// CSS had something specified that couldn't be converted to an
// image object
return nullptr;
}
// Create an image content object and pass it the image request.
// XXX Check if it's an image type we can handle...
nsCOMPtr<nsINodeInfo> nodeInfo;
nodeInfo = mDocument->NodeInfoManager()->
GetNodeInfo(nsGkAtoms::mozgeneratedcontentimage, nullptr,
kNameSpaceID_XHTML, nsIDOMNode::ELEMENT_NODE);
nsCOMPtr<nsIContent> content;
NS_NewGenConImageContent(getter_AddRefs(content), nodeInfo.forget(),
data.mContent.mImage);
return content.forget();
}
switch (type) {
case eStyleContentType_String:
return CreateGenConTextNode(aState,
nsDependentString(data.mContent.mString),
nullptr, nullptr);
case eStyleContentType_Attr:
{
nsCOMPtr<nsIAtom> attrName;
int32_t attrNameSpace = kNameSpaceID_None;
nsAutoString contentString(data.mContent.mString);
int32_t barIndex = contentString.FindChar('|'); // CSS namespace delimiter
if (-1 != barIndex) {
nsAutoString nameSpaceVal;
contentString.Left(nameSpaceVal, barIndex);
nsresult error;
attrNameSpace = nameSpaceVal.ToInteger(&error);
contentString.Cut(0, barIndex + 1);
if (contentString.Length()) {
if (mDocument->IsHTML() && aParentContent->IsHTML()) {
ToLowerCase(contentString);
}
attrName = do_GetAtom(contentString);
}
}
else {
if (mDocument->IsHTML() && aParentContent->IsHTML()) {
ToLowerCase(contentString);
}
attrName = do_GetAtom(contentString);
}
if (!attrName) {
return nullptr;
}
nsCOMPtr<nsIContent> content;
NS_NewAttributeContent(mDocument->NodeInfoManager(),
attrNameSpace, attrName, getter_AddRefs(content));
return content.forget();
}
case eStyleContentType_Counter:
case eStyleContentType_Counters:
{
nsCSSValue::Array* counters = data.mContent.mCounters;
nsCounterList* counterList = mCounterManager.CounterListFor(
nsDependentString(counters->Item(0).GetStringBufferValue()));
if (!counterList)
return nullptr;
nsCounterUseNode* node =
new nsCounterUseNode(counters, aContentIndex,
type == eStyleContentType_Counters);
nsGenConInitializer* initializer =
new nsGenConInitializer(node, counterList,
&nsCSSFrameConstructor::CountersDirty);
return CreateGenConTextNode(aState, EmptyString(), &node->mText,
initializer);
}
case eStyleContentType_Image:
NS_NOTREACHED("handled by if above");
return nullptr;
case eStyleContentType_OpenQuote:
case eStyleContentType_CloseQuote:
case eStyleContentType_NoOpenQuote:
case eStyleContentType_NoCloseQuote:
{
nsQuoteNode* node =
new nsQuoteNode(type, aContentIndex);
nsGenConInitializer* initializer =
new nsGenConInitializer(node, &mQuoteList,
&nsCSSFrameConstructor::QuotesDirty);
return CreateGenConTextNode(aState, EmptyString(), &node->mText,
initializer);
}
case eStyleContentType_AltContent:
{
// Use the "alt" attribute; if that fails and the node is an HTML
// <input>, try the value attribute and then fall back to some default
// localized text we have.
// XXX what if the 'alt' attribute is added later, how will we
// detect that and do the right thing here?
if (aParentContent->HasAttr(kNameSpaceID_None, nsGkAtoms::alt)) {
nsCOMPtr<nsIContent> content;
NS_NewAttributeContent(mDocument->NodeInfoManager(),
kNameSpaceID_None, nsGkAtoms::alt, getter_AddRefs(content));
return content.forget();
}
if (aParentContent->IsHTML() &&
aParentContent->NodeInfo()->Equals(nsGkAtoms::input)) {
if (aParentContent->HasAttr(kNameSpaceID_None, nsGkAtoms::value)) {
nsCOMPtr<nsIContent> content;
NS_NewAttributeContent(mDocument->NodeInfoManager(),
kNameSpaceID_None, nsGkAtoms::value, getter_AddRefs(content));
return content.forget();
}
nsXPIDLString temp;
nsContentUtils::GetLocalizedString(nsContentUtils::eFORMS_PROPERTIES,
"Submit", temp);
return CreateGenConTextNode(aState, temp, nullptr, nullptr);
}
break;
}
case eStyleContentType_Uninitialized:
NS_NOTREACHED("uninitialized content type");
return nullptr;
} // switch
return nullptr;
}
/*
* aParentFrame - the frame that should be the parent of the generated
* content. This is the frame for the corresponding content node,
* which must not be a leaf frame.
*
* Any items created are added to aItems.
*
* We create an XML element (tag _moz_generated_content_before or
* _moz_generated_content_after) representing the pseudoelement. We
* create a DOM node for each 'content' item and make those nodes the
* children of the XML element. Then we create a frame subtree for
* the XML element as if it were a regular child of
* aParentFrame/aParentContent, giving the XML element the ::before or
* ::after style.
*/
void
nsCSSFrameConstructor::CreateGeneratedContentItem(nsFrameConstructorState& aState,
nsIFrame* aParentFrame,
nsIContent* aParentContent,
nsStyleContext* aStyleContext,
nsCSSPseudoElements::Type aPseudoElement,
FrameConstructionItemList& aItems)
{
// XXXbz is this ever true?
if (!aParentContent->IsElement()) {
NS_ERROR("Bogus generated content parent");
return;
}
nsStyleSet *styleSet = mPresShell->StyleSet();
// Probe for the existence of the pseudo-element
nsRefPtr<nsStyleContext> pseudoStyleContext;
pseudoStyleContext =
styleSet->ProbePseudoElementStyle(aParentContent->AsElement(),
aPseudoElement,
aStyleContext,
aState.mTreeMatchContext);
if (!pseudoStyleContext)
return;
// |ProbePseudoStyleFor| checked the 'display' property and the
// |ContentCount()| of the 'content' property for us.
nsCOMPtr<nsINodeInfo> nodeInfo;
nsIAtom* elemName = aPseudoElement == nsCSSPseudoElements::ePseudo_before ?
nsGkAtoms::mozgeneratedcontentbefore : nsGkAtoms::mozgeneratedcontentafter;
nodeInfo = mDocument->NodeInfoManager()->GetNodeInfo(elemName, nullptr,
kNameSpaceID_None,
nsIDOMNode::ELEMENT_NODE);
nsCOMPtr<nsIContent> container;
nsresult rv = NS_NewXMLElement(getter_AddRefs(container), nodeInfo.forget());
if (NS_FAILED(rv))
return;
container->SetIsNativeAnonymousRoot();
rv = container->BindToTree(mDocument, aParentContent, aParentContent, true);
if (NS_FAILED(rv)) {
container->UnbindFromTree();
return;
}
uint32_t contentCount = pseudoStyleContext->StyleContent()->ContentCount();
for (uint32_t contentIndex = 0; contentIndex < contentCount; contentIndex++) {
nsCOMPtr<nsIContent> content =
CreateGeneratedContent(aState, aParentContent, pseudoStyleContext,
contentIndex);
if (content) {
container->AppendChildTo(content, false);
}
}
AddFrameConstructionItemsInternal(aState, container, aParentFrame, elemName,
kNameSpaceID_None, true,
pseudoStyleContext,
ITEM_IS_GENERATED_CONTENT, nullptr,
aItems);
}
/****************************************************
** BEGIN TABLE SECTION
****************************************************/
// The term pseudo frame is being used instead of anonymous frame, since anonymous
// frame has been used elsewhere to refer to frames that have generated content
// Return whether the given frame is a table pseudo-frame. Note that
// cell-content and table-outer frames have pseudo-types, but are always
// created, even for non-anonymous cells and tables respectively. So for those
// we have to examine the cell or table frame to see whether it's a pseudo
// frame. In particular, a lone table caption will have an outer table as its
// parent, but will also trigger construction of an empty inner table, which
// will be the one we can examine to see whether the outer was a pseudo-frame.
static bool
IsTablePseudo(nsIFrame* aFrame)
{
nsIAtom* pseudoType = aFrame->StyleContext()->GetPseudo();
return pseudoType &&
(pseudoType == nsCSSAnonBoxes::table ||
pseudoType == nsCSSAnonBoxes::inlineTable ||
pseudoType == nsCSSAnonBoxes::tableColGroup ||
pseudoType == nsCSSAnonBoxes::tableRowGroup ||
pseudoType == nsCSSAnonBoxes::tableRow ||
pseudoType == nsCSSAnonBoxes::tableCell ||
(pseudoType == nsCSSAnonBoxes::cellContent &&
aFrame->GetParent()->StyleContext()->GetPseudo() ==
nsCSSAnonBoxes::tableCell) ||
(pseudoType == nsCSSAnonBoxes::tableOuter &&
(aFrame->GetFirstPrincipalChild()->StyleContext()->GetPseudo() ==
nsCSSAnonBoxes::table ||
aFrame->GetFirstPrincipalChild()->StyleContext()->GetPseudo() ==
nsCSSAnonBoxes::inlineTable)));
}
/* static */
nsCSSFrameConstructor::ParentType
nsCSSFrameConstructor::GetParentType(nsIAtom* aFrameType)
{
if (aFrameType == nsGkAtoms::tableFrame) {
return eTypeTable;
}
if (aFrameType == nsGkAtoms::tableRowGroupFrame) {
return eTypeRowGroup;
}
if (aFrameType == nsGkAtoms::tableRowFrame) {
return eTypeRow;
}
if (aFrameType == nsGkAtoms::tableColGroupFrame) {
return eTypeColGroup;
}
return eTypeBlock;
}
static nsIFrame*
AdjustCaptionParentFrame(nsIFrame* aParentFrame)
{
if (nsGkAtoms::tableFrame == aParentFrame->GetType()) {
return aParentFrame->GetParent();;
}
return aParentFrame;
}
/**
* If the parent frame is a |tableFrame| and the child is a
* |captionFrame|, then we want to insert the frames beneath the
* |tableFrame|'s parent frame. Returns |true| if the parent frame
* needed to be fixed up.
*/
static bool
GetCaptionAdjustedParent(nsIFrame* aParentFrame,
const nsIFrame* aChildFrame,
nsIFrame** aAdjParentFrame)
{
*aAdjParentFrame = aParentFrame;
bool haveCaption = false;
if (nsGkAtoms::tableCaptionFrame == aChildFrame->GetType()) {
haveCaption = true;
*aAdjParentFrame = AdjustCaptionParentFrame(aParentFrame);
}
return haveCaption;
}
void
nsCSSFrameConstructor::AdjustParentFrame(nsIFrame* & aParentFrame,
const FrameConstructionData* aFCData,
nsStyleContext* aStyleContext)
{
NS_PRECONDITION(aStyleContext, "Must have child's style context");
NS_PRECONDITION(aFCData, "Must have frame construction data");
bool tablePart = ((aFCData->mBits & FCDATA_IS_TABLE_PART) != 0);
if (tablePart && aStyleContext->StyleDisplay()->mDisplay ==
NS_STYLE_DISPLAY_TABLE_CAPTION) {
aParentFrame = AdjustCaptionParentFrame(aParentFrame);
}
}
// Pull all the captions present in aItems out into aCaptions
static void
PullOutCaptionFrames(nsFrameItems& aItems, nsFrameItems& aCaptions)
{
nsIFrame *child = aItems.FirstChild();
while (child) {
nsIFrame *nextSibling = child->GetNextSibling();
if (nsGkAtoms::tableCaptionFrame == child->GetType()) {
aItems.RemoveFrame(child);
aCaptions.AddChild(child);
}
child = nextSibling;
}
}
// Construct the outer, inner table frames and the children frames for the table.
// XXX Page break frames for pseudo table frames are not constructed to avoid the risk
// associated with revising the pseudo frame mechanism. The long term solution
// of having frames handle page-break-before/after will solve the problem.
nsIFrame*
nsCSSFrameConstructor::ConstructTable(nsFrameConstructorState& aState,
FrameConstructionItem& aItem,
nsIFrame* aParentFrame,
const nsStyleDisplay* aDisplay,
nsFrameItems& aFrameItems)
{
NS_PRECONDITION(aDisplay->mDisplay == NS_STYLE_DISPLAY_TABLE ||
aDisplay->mDisplay == NS_STYLE_DISPLAY_INLINE_TABLE,
"Unexpected call");
nsIContent* const content = aItem.mContent;
nsStyleContext* const styleContext = aItem.mStyleContext;
const uint32_t nameSpaceID = aItem.mNameSpaceID;
// create the pseudo SC for the outer table as a child of the inner SC
nsRefPtr<nsStyleContext> outerStyleContext;
outerStyleContext = mPresShell->StyleSet()->
ResolveAnonymousBoxStyle(nsCSSAnonBoxes::tableOuter, styleContext);
// Create the outer table frame which holds the caption and inner table frame
nsIFrame* newFrame;
if (kNameSpaceID_MathML == nameSpaceID)
newFrame = NS_NewMathMLmtableOuterFrame(mPresShell, outerStyleContext);
else
newFrame = NS_NewTableOuterFrame(mPresShell, outerStyleContext);
nsIFrame* geometricParent =
aState.GetGeometricParent(outerStyleContext->StyleDisplay(),
aParentFrame);
// Init the table outer frame
InitAndRestoreFrame(aState, content, geometricParent, newFrame);
// Create the inner table frame
nsIFrame* innerFrame;
if (kNameSpaceID_MathML == nameSpaceID)
innerFrame = NS_NewMathMLmtableFrame(mPresShell, styleContext);
else
innerFrame = NS_NewTableFrame(mPresShell, styleContext);
InitAndRestoreFrame(aState, content, newFrame, innerFrame);
// Put the newly created frames into the right child list
SetInitialSingleChild(newFrame, innerFrame);
aState.AddChild(newFrame, aFrameItems, content, styleContext, aParentFrame);
if (!mRootElementFrame) {
// The frame we're constructing will be the root element frame.
// Set mRootElementFrame before processing children.
mRootElementFrame = newFrame;
}
nsFrameItems childItems;
// Process children
nsFrameConstructorSaveState absoluteSaveState;
const nsStyleDisplay* display = outerStyleContext->StyleDisplay();
// Mark the table frame as an absolute container if needed
newFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
if ((display->IsRelativelyPositionedStyle() ||
display->IsAbsolutelyPositionedStyle() ||
(display->HasTransformStyle() &&
aParentFrame->IsFrameOfType(nsIFrame::eSupportsCSSTransforms))) &&
!aParentFrame->IsSVGText()) {
aState.PushAbsoluteContainingBlock(newFrame, newFrame, absoluteSaveState);
}
NS_ASSERTION(aItem.mAnonChildren.IsEmpty(),
"nsIAnonymousContentCreator::CreateAnonymousContent "
"implementations for table frames are not currently expected "
"to output a list where the items have their own children");
if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) {
ConstructFramesFromItemList(aState, aItem.mChildItems,
innerFrame, childItems);
} else {
ProcessChildren(aState, content, styleContext, innerFrame,
true, childItems, false, aItem.mPendingBinding);
}
nsFrameItems captionItems;
PullOutCaptionFrames(childItems, captionItems);
// Set the inner table frame's initial primary list
innerFrame->SetInitialChildList(kPrincipalList, childItems);
// Set the outer table frame's secondary childlist lists
if (captionItems.NotEmpty()) {
newFrame->SetInitialChildList(nsIFrame::kCaptionList, captionItems);
}
return newFrame;
}
nsIFrame*
nsCSSFrameConstructor::ConstructTableRow(nsFrameConstructorState& aState,
FrameConstructionItem& aItem,
nsIFrame* aParentFrame,
const nsStyleDisplay* aDisplay,
nsFrameItems& aFrameItems)
{
NS_PRECONDITION(aDisplay->mDisplay == NS_STYLE_DISPLAY_TABLE_ROW,
"Unexpected call");
nsIContent* const content = aItem.mContent;
nsStyleContext* const styleContext = aItem.mStyleContext;
const uint32_t nameSpaceID = aItem.mNameSpaceID;
nsIFrame* newFrame;
if (kNameSpaceID_MathML == nameSpaceID)
newFrame = NS_NewMathMLmtrFrame(mPresShell, styleContext);
else
newFrame = NS_NewTableRowFrame(mPresShell, styleContext);
InitAndRestoreFrame(aState, content, aParentFrame, newFrame);
nsFrameItems childItems;
NS_ASSERTION(aItem.mAnonChildren.IsEmpty(),
"nsIAnonymousContentCreator::CreateAnonymousContent "
"implementations for table frames are not currently expected "
"to output a list where the items have their own children");
if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) {
ConstructFramesFromItemList(aState, aItem.mChildItems, newFrame,
childItems);
} else {
ProcessChildren(aState, content, styleContext, newFrame,
true, childItems, false, aItem.mPendingBinding);
}
newFrame->SetInitialChildList(kPrincipalList, childItems);
aFrameItems.AddChild(newFrame);
return newFrame;
}
nsIFrame*
nsCSSFrameConstructor::ConstructTableCol(nsFrameConstructorState& aState,
FrameConstructionItem& aItem,
nsIFrame* aParentFrame,
const nsStyleDisplay* aStyleDisplay,
nsFrameItems& aFrameItems)
{
nsIContent* const content = aItem.mContent;
nsStyleContext* const styleContext = aItem.mStyleContext;
nsTableColFrame* colFrame = NS_NewTableColFrame(mPresShell, styleContext);
InitAndRestoreFrame(aState, content, aParentFrame, colFrame);
NS_ASSERTION(colFrame->StyleContext() == styleContext,
"Unexpected style context");
aFrameItems.AddChild(colFrame);
// construct additional col frames if the col frame has a span > 1
int32_t span = colFrame->GetSpan();
for (int32_t spanX = 1; spanX < span; spanX++) {
nsTableColFrame* newCol = NS_NewTableColFrame(mPresShell, styleContext);
InitAndRestoreFrame(aState, content, aParentFrame, newCol, false);
aFrameItems.LastChild()->SetNextContinuation(newCol);
newCol->SetPrevContinuation(aFrameItems.LastChild());
aFrameItems.AddChild(newCol);
newCol->SetColType(eColAnonymousCol);
}
return colFrame;
}
nsIFrame*
nsCSSFrameConstructor::ConstructTableCell(nsFrameConstructorState& aState,
FrameConstructionItem& aItem,
nsIFrame* aParentFrame,
const nsStyleDisplay* aDisplay,
nsFrameItems& aFrameItems)
{
NS_PRECONDITION(aDisplay->mDisplay == NS_STYLE_DISPLAY_TABLE_CELL,
"Unexpected call");
nsIContent* const content = aItem.mContent;
nsStyleContext* const styleContext = aItem.mStyleContext;
const uint32_t nameSpaceID = aItem.mNameSpaceID;
bool borderCollapse = IsBorderCollapse(aParentFrame);
nsIFrame* newFrame;
// <mtable> is border separate in mathml.css and the MathML code doesn't implement
// border collapse. For those users who style <mtable> with border collapse,
// give them the default non-MathML table frames that understand border collapse.
// This won't break us because MathML table frames are all subclasses of the default
// table code, and so we can freely mix <mtable> with <mtr> or <tr>, <mtd> or <td>.
// What will happen is just that non-MathML frames won't understand MathML attributes
// and will therefore miss the special handling that the MathML code does.
if (kNameSpaceID_MathML == nameSpaceID && !borderCollapse)
newFrame = NS_NewMathMLmtdFrame(mPresShell, styleContext);
else
// Warning: If you change this and add a wrapper frame around table cell
// frames, make sure Bug 368554 doesn't regress!
// See IsInAutoWidthTableCellForQuirk() in nsImageFrame.cpp.
newFrame = NS_NewTableCellFrame(mPresShell, styleContext, borderCollapse);
// Initialize the table cell frame
InitAndRestoreFrame(aState, content, aParentFrame, newFrame);
// Resolve pseudo style and initialize the body cell frame
nsRefPtr<nsStyleContext> innerPseudoStyle;
innerPseudoStyle = mPresShell->StyleSet()->
ResolveAnonymousBoxStyle(nsCSSAnonBoxes::cellContent, styleContext);
// Create a block frame that will format the cell's content
bool isBlock;
nsIFrame* cellInnerFrame;
if (kNameSpaceID_MathML == nameSpaceID) {
cellInnerFrame = NS_NewMathMLmtdInnerFrame(mPresShell, innerPseudoStyle);
isBlock = false;
} else {
cellInnerFrame = NS_NewBlockFormattingContext(mPresShell, innerPseudoStyle);
isBlock = true;
}
InitAndRestoreFrame(aState, content, newFrame, cellInnerFrame);
nsFrameItems childItems;
NS_ASSERTION(aItem.mAnonChildren.IsEmpty(),
"nsIAnonymousContentCreator::CreateAnonymousContent "
"implementations for table frames are not currently expected "
"to output a list where the items have their own children");
if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) {
// Need to push ourselves as a float containing block.
// XXXbz it might be nice to work on getting the parent
// FrameConstructionItem down into ProcessChildren and just making use of
// the push there, but that's a bit of work.
nsFrameConstructorSaveState floatSaveState;
if (!isBlock) { /* MathML case */
aState.PushFloatContainingBlock(nullptr, floatSaveState);
} else {
aState.PushFloatContainingBlock(cellInnerFrame, floatSaveState);
}
ConstructFramesFromItemList(aState, aItem.mChildItems, cellInnerFrame,
childItems);
} else {
// Process the child content
ProcessChildren(aState, content, styleContext, cellInnerFrame,
true, childItems, isBlock, aItem.mPendingBinding);
}
cellInnerFrame->SetInitialChildList(kPrincipalList, childItems);
SetInitialSingleChild(newFrame, cellInnerFrame);
aFrameItems.AddChild(newFrame);
return newFrame;
}
static inline bool
NeedFrameFor(const nsFrameConstructorState& aState,
nsIFrame* aParentFrame,
nsIContent* aChildContent)
{
// XXX the GetContent() != aChildContent check is needed due to bug 135040.
// Remove it once that's fixed.
NS_PRECONDITION(!aChildContent->GetPrimaryFrame() ||
aState.mCreatingExtraFrames ||
aChildContent->GetPrimaryFrame()->GetContent() != aChildContent,
"Why did we get called?");
// don't create a whitespace frame if aParentFrame doesn't want it.
// always create frames for children in generated content. counter(),
// quotes, and attr() content can easily change dynamically and we don't
// want to be reconstructing frames. It's not even clear that these
// should be considered ignorable just because they evaluate to
// whitespace.
// We could handle all this in CreateNeededTablePseudos or some other place
// after we build our frame construction items, but that would involve
// creating frame construction items for whitespace kids of
// eExcludesIgnorableWhitespace frames, where we know we'll be dropping them
// all anyway, and involve an extra walk down the frame construction item
// list.
if (!aParentFrame->IsFrameOfType(nsIFrame::eExcludesIgnorableWhitespace) ||
aParentFrame->IsGeneratedContentFrame() ||
!aChildContent->IsNodeOfType(nsINode::eTEXT)) {
return true;
}
aChildContent->SetFlags(NS_CREATE_FRAME_IF_NON_WHITESPACE |
NS_REFRAME_IF_WHITESPACE);
return !aChildContent->TextIsOnlyWhitespace();
}
/***********************************************
* END TABLE SECTION
***********************************************/
static bool CheckOverflow(nsPresContext* aPresContext,
const nsStyleDisplay* aDisplay)
{
if (aDisplay->mOverflowX == NS_STYLE_OVERFLOW_VISIBLE)
return false;
if (aDisplay->mOverflowX == NS_STYLE_OVERFLOW_CLIP)
aPresContext->SetViewportOverflowOverride(NS_STYLE_OVERFLOW_HIDDEN,
NS_STYLE_OVERFLOW_HIDDEN);
else
aPresContext->SetViewportOverflowOverride(aDisplay->mOverflowX,
aDisplay->mOverflowY);
return true;
}
/**
* This checks the root element and the HTML BODY, if any, for an "overflow" property
* that should be applied to the viewport. If one is found then we return the
* element that we took the overflow from (which should then be treated as
* "overflow:visible"), and we store the overflow style in the prescontext.
* @return if scroll was propagated from some content node, the content node it
* was propagated from.
*/
nsIContent*
nsCSSFrameConstructor::PropagateScrollToViewport()
{
// Set default
nsPresContext* presContext = mPresShell->GetPresContext();
presContext->SetViewportOverflowOverride(NS_STYLE_OVERFLOW_AUTO,
NS_STYLE_OVERFLOW_AUTO);
// We never mess with the viewport scroll state
// when printing or in print preview
if (presContext->IsPaginated()) {
return nullptr;
}
Element* docElement = mDocument->GetRootElement();
// Check the style on the document root element
nsStyleSet *styleSet = mPresShell->StyleSet();
nsRefPtr<nsStyleContext> rootStyle;
rootStyle = styleSet->ResolveStyleFor(docElement, nullptr);
if (CheckOverflow(presContext, rootStyle->StyleDisplay())) {
// tell caller we stole the overflow style from the root element
return docElement;
}
// Don't look in the BODY for non-HTML documents or HTML documents
// with non-HTML roots
// XXX this should be earlier; we shouldn't even look at the document root
// for non-HTML documents. Fix this once we support explicit CSS styling
// of the viewport
// XXX what about XHTML?
nsCOMPtr<nsIDOMHTMLDocument> htmlDoc(do_QueryInterface(mDocument));
if (!htmlDoc || !docElement->IsHTML()) {
return nullptr;
}
nsCOMPtr<nsIDOMHTMLElement> body;
htmlDoc->GetBody(getter_AddRefs(body));
nsCOMPtr<nsIContent> bodyElement = do_QueryInterface(body);
if (!bodyElement ||
!bodyElement->NodeInfo()->Equals(nsGkAtoms::body)) {
// The body is not a <body> tag, it's a <frameset>.
return nullptr;
}
nsRefPtr<nsStyleContext> bodyStyle;
bodyStyle = styleSet->ResolveStyleFor(bodyElement->AsElement(), rootStyle);
if (CheckOverflow(presContext, bodyStyle->StyleDisplay())) {
// tell caller we stole the overflow style from the body element
return bodyElement;
}
return nullptr;
}
nsIFrame*
nsCSSFrameConstructor::ConstructDocElementFrame(Element* aDocElement,
nsILayoutHistoryState* aFrameState)
{
NS_PRECONDITION(mFixedContainingBlock,
"No viewport? Someone forgot to call ConstructRootFrame!");
NS_PRECONDITION(mFixedContainingBlock == GetRootFrame(),
"Unexpected mFixedContainingBlock");
NS_PRECONDITION(!mDocElementContainingBlock,
"Shouldn't have a doc element containing block here");
// Make sure to call PropagateScrollToViewport before
// SetUpDocElementContainingBlock, since it sets up our scrollbar state
// properly.
#ifdef DEBUG
nsIContent* propagatedScrollFrom =
#endif
PropagateScrollToViewport();
SetUpDocElementContainingBlock(aDocElement);
NS_ASSERTION(mDocElementContainingBlock, "Should have parent by now");
nsFrameConstructorState state(mPresShell, mFixedContainingBlock, nullptr,
nullptr, aFrameState);
// Initialize the ancestor filter with null for now; we'll push
// aDocElement once we finish resolving style for it.
state.mTreeMatchContext.InitAncestors(nullptr);
// XXXbz why, exactly?
if (!mTempFrameTreeState)
state.mPresShell->CaptureHistoryState(getter_AddRefs(mTempFrameTreeState));
// Make sure that we'll handle restyles for this document element in
// the future. We need this, because the document element might
// have stale restyle bits from a previous frame constructor for
// this document. Unlike in AddFrameConstructionItems, it's safe to
// unset all element restyle flags, since we don't have any
// siblings.
aDocElement->UnsetFlags(ELEMENT_ALL_RESTYLE_FLAGS);
// --------- CREATE AREA OR BOX FRAME -------
nsRefPtr<nsStyleContext> styleContext;
styleContext = mPresShell->StyleSet()->ResolveStyleFor(aDocElement,
nullptr);
const nsStyleDisplay* display = styleContext->StyleDisplay();
// Ensure that our XBL bindings are installed.
if (display->mBinding) {
// Get the XBL loader.
nsresult rv;
bool resolveStyle;
nsXBLService* xblService = nsXBLService::GetInstance();
if (!xblService) {
return nullptr;
}
nsRefPtr<nsXBLBinding> binding;
rv = xblService->LoadBindings(aDocElement, display->mBinding->GetURI(),
display->mBinding->mOriginPrincipal,
getter_AddRefs(binding), &resolveStyle);
if (NS_FAILED(rv) && rv != NS_ERROR_XBL_BLOCKED)
return nullptr; // Binding will load asynchronously.
if (binding) {
// For backwards compat, keep firing the root's constructor
// after all of its kids' constructors. So tell the binding
// manager about it right now.
mDocument->BindingManager()->AddToAttachedQueue(binding);
}
if (resolveStyle) {
styleContext = mPresShell->StyleSet()->ResolveStyleFor(aDocElement,
nullptr);
display = styleContext->StyleDisplay();
}
}
// --------- IF SCROLLABLE WRAP IN SCROLLFRAME --------
#ifdef DEBUG
NS_ASSERTION(!display->IsScrollableOverflow() ||
state.mPresContext->IsPaginated() ||
propagatedScrollFrom == aDocElement,
"Scrollbars should have been propagated to the viewport");
#endif
if (MOZ_UNLIKELY(display->mDisplay == NS_STYLE_DISPLAY_NONE)) {
SetUndisplayedContent(aDocElement, styleContext);
return nullptr;
}
TreeMatchContext::AutoAncestorPusher
ancestorPusher(true, state.mTreeMatchContext, aDocElement);
// Make sure to start any background image loads for the root element now.
styleContext->StartBackgroundImageLoads();
nsFrameConstructorSaveState absoluteSaveState;
if (mHasRootAbsPosContainingBlock) {
// Push the absolute containing block now so we can absolutely position
// the root element
mDocElementContainingBlock->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
state.PushAbsoluteContainingBlock(mDocElementContainingBlock,
mDocElementContainingBlock,
absoluteSaveState);
}
// The rules from CSS 2.1, section 9.2.4, have already been applied
// by the style system, so we can assume that display->mDisplay is
// either NONE, BLOCK, or TABLE.
// contentFrame is the primary frame for the root element. newFrame
// is the frame that will be the child of the initial containing block.
// These are usually the same frame but they can be different, in
// particular if the root frame is positioned, in which case
// contentFrame is the out-of-flow frame and newFrame is the
// placeholder.
nsIFrame* contentFrame;
nsIFrame* newFrame;
bool processChildren = false;
// Check whether we need to build a XUL box or SVG root frame
#ifdef MOZ_XUL
if (aDocElement->IsXUL()) {
contentFrame = NS_NewDocElementBoxFrame(mPresShell, styleContext);
InitAndRestoreFrame(state, aDocElement, mDocElementContainingBlock,
contentFrame);
newFrame = contentFrame;
processChildren = true;
}
else
#endif
if (aDocElement->IsSVG()) {
if (aDocElement->Tag() == nsGkAtoms::svg) {
// We're going to call the right function ourselves, so no need to give a
// function to this FrameConstructionData.
// XXXbz on the other hand, if we converted this whole function to
// FrameConstructionData/Item, then we'd need the right function
// here... but would probably be able to get away with less code in this
// function in general.
// Use a null PendingBinding, since our binding is not in fact pending.
static const FrameConstructionData rootSVGData = FCDATA_DECL(0, nullptr);
nsRefPtr<nsStyleContext> extraRef(styleContext);
FrameConstructionItem item(&rootSVGData, aDocElement,
aDocElement->Tag(), kNameSpaceID_SVG,
nullptr, extraRef.forget(), true, nullptr);
nsFrameItems frameItems;
contentFrame = ConstructOuterSVG(state, item, mDocElementContainingBlock,
styleContext->StyleDisplay(),
frameItems);
newFrame = frameItems.FirstChild();
NS_ASSERTION(frameItems.OnlyChild(), "multiple root element frames");
} else {
return nullptr;
}
} else {
bool docElemIsTable = (display->mDisplay == NS_STYLE_DISPLAY_TABLE);
if (docElemIsTable) {
// We're going to call the right function ourselves, so no need to give a
// function to this FrameConstructionData.
// XXXbz on the other hand, if we converted this whole function to
// FrameConstructionData/Item, then we'd need the right function
// here... but would probably be able to get away with less code in this
// function in general.
// Use a null PendingBinding, since our binding is not in fact pending.
static const FrameConstructionData rootTableData = FCDATA_DECL(0, nullptr);
nsRefPtr<nsStyleContext> extraRef(styleContext);
FrameConstructionItem item(&rootTableData, aDocElement,
aDocElement->Tag(), kNameSpaceID_None,
nullptr, extraRef.forget(), true, nullptr);
nsFrameItems frameItems;
// if the document is a table then just populate it.
contentFrame = ConstructTable(state, item, mDocElementContainingBlock,
styleContext->StyleDisplay(),
frameItems);
newFrame = frameItems.FirstChild();
NS_ASSERTION(frameItems.OnlyChild(), "multiple root element frames");
} else {
contentFrame = NS_NewBlockFormattingContext(mPresShell, styleContext);
nsFrameItems frameItems;
// Use a null PendingBinding, since our binding is not in fact pending.
ConstructBlock(state, display, aDocElement,
state.GetGeometricParent(display,
mDocElementContainingBlock),
mDocElementContainingBlock, styleContext,
&contentFrame, frameItems,
display->IsPositioned(contentFrame) ? contentFrame : nullptr,
nullptr);
newFrame = frameItems.FirstChild();
NS_ASSERTION(frameItems.OnlyChild(), "multiple root element frames");
}
}
MOZ_ASSERT(newFrame);
MOZ_ASSERT(contentFrame);
// set the primary frame
aDocElement->SetPrimaryFrame(contentFrame);
NS_ASSERTION(processChildren ? !mRootElementFrame :
mRootElementFrame == contentFrame,
"unexpected mRootElementFrame");
mRootElementFrame = contentFrame;
// Figure out which frame has the main style for the document element,
// assigning it to mRootElementStyleFrame.
// Backgrounds should be propagated from that frame to the viewport.
mRootElementStyleFrame = contentFrame->GetParentStyleContextFrame();
bool isChild = mRootElementStyleFrame &&
mRootElementStyleFrame->GetParent() == contentFrame;
if (!isChild) {
mRootElementStyleFrame = mRootElementFrame;
}
if (processChildren) {
// Still need to process the child content
nsFrameItems childItems;
NS_ASSERTION(!nsLayoutUtils::GetAsBlock(contentFrame) &&
!contentFrame->IsFrameOfType(nsIFrame::eSVG),
"Only XUL frames should reach here");
// Use a null PendingBinding, since our binding is not in fact pending.
ProcessChildren(state, aDocElement, styleContext, contentFrame, true,
childItems, false, nullptr);
// Set the initial child lists
contentFrame->SetInitialChildList(kPrincipalList, childItems);
}
SetInitialSingleChild(mDocElementContainingBlock, newFrame);
return newFrame;
}
nsIFrame*
nsCSSFrameConstructor::ConstructRootFrame()
{
AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
nsStyleSet *styleSet = mPresShell->StyleSet();
// Set up our style rule observer.
// XXXbz wouldn't this make more sense as part of presshell init?
{
styleSet->SetBindingManager(mDocument->BindingManager());
}
// --------- BUILD VIEWPORT -----------
nsIFrame* viewportFrame = nullptr;
nsRefPtr<nsStyleContext> viewportPseudoStyle;
viewportPseudoStyle =
styleSet->ResolveAnonymousBoxStyle(nsCSSAnonBoxes::viewport, nullptr);
viewportFrame = NS_NewViewportFrame(mPresShell, viewportPseudoStyle);
// XXXbz do we _have_ to pass a null content pointer to that frame?
// Would it really kill us to pass in the root element or something?
// What would that break?
viewportFrame->Init(nullptr, nullptr, nullptr);
// Bind the viewport frame to the root view
nsView* rootView = mPresShell->GetViewManager()->GetRootView();
viewportFrame->SetView(rootView);
nsContainerFrame::SyncFrameViewProperties(mPresShell->GetPresContext(), viewportFrame,
viewportPseudoStyle, rootView);
nsContainerFrame::SyncWindowProperties(mPresShell->GetPresContext(), viewportFrame,
rootView);
// The viewport is the containing block for 'fixed' elements
mFixedContainingBlock = viewportFrame;
// Make it an absolute container for fixed-pos elements
mFixedContainingBlock->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
mFixedContainingBlock->MarkAsAbsoluteContainingBlock();
return viewportFrame;
}
void
nsCSSFrameConstructor::SetUpDocElementContainingBlock(nsIContent* aDocElement)
{
NS_PRECONDITION(aDocElement, "No element?");
NS_PRECONDITION(!aDocElement->GetParent(), "Not root content?");
NS_PRECONDITION(aDocElement->GetCurrentDoc(), "Not in a document?");
NS_PRECONDITION(aDocElement->GetCurrentDoc()->GetRootElement() ==
aDocElement, "Not the root of the document?");
/*
how the root frame hierarchy should look
Galley presentation, non-XUL, with scrolling:
ViewportFrame [fixed-cb]
nsHTMLScrollFrame
nsCanvasFrame [abs-cb]
root element frame (nsBlockFrame, nsSVGOuterSVGFrame,
nsTableOuterFrame, nsPlaceholderFrame)
Galley presentation, XUL
ViewportFrame [fixed-cb]
nsRootBoxFrame
root element frame (nsDocElementBoxFrame)
Print presentation, non-XUL
ViewportFrame
nsSimplePageSequenceFrame
nsPageFrame [fixed-cb]
nsPageContentFrame
nsCanvasFrame [abs-cb]
root element frame (nsBlockFrame, nsSVGOuterSVGFrame,
nsTableOuterFrame, nsPlaceholderFrame)
Print-preview presentation, non-XUL
ViewportFrame
nsHTMLScrollFrame
nsSimplePageSequenceFrame
nsPageFrame [fixed-cb]
nsPageContentFrame
nsCanvasFrame [abs-cb]
root element frame (nsBlockFrame, nsSVGOuterSVGFrame,
nsTableOuterFrame, nsPlaceholderFrame)
Print/print preview of XUL is not supported.
[fixed-cb]: the default containing block for fixed-pos content
[abs-cb]: the default containing block for abs-pos content
Meaning of nsCSSFrameConstructor fields:
mRootElementFrame is "root element frame". This is the primary frame for
the root element.
mDocElementContainingBlock is the parent of mRootElementFrame
(i.e. nsCanvasFrame or nsRootBoxFrame)
mFixedContainingBlock is the [fixed-cb]
mGfxScrollFrame is the nsHTMLScrollFrame mentioned above, or null if there isn't one
mPageSequenceFrame is the nsSimplePageSequenceFrame, or null if there isn't one
*/
// --------- CREATE ROOT FRAME -------
// Create the root frame. The document element's frame is a child of the
// root frame.
//
// The root frame serves two purposes:
// - reserves space for any margins needed for the document element's frame
// - renders the document element's background. This ensures the background covers
// the entire canvas as specified by the CSS2 spec
nsPresContext* presContext = mPresShell->GetPresContext();
bool isPaginated = presContext->IsRootPaginatedDocument();
nsIFrame* viewportFrame = mFixedContainingBlock;
nsStyleContext* viewportPseudoStyle = viewportFrame->StyleContext();
nsIFrame* rootFrame = nullptr;
nsIAtom* rootPseudo;
if (!isPaginated) {
#ifdef MOZ_XUL
if (aDocElement->IsXUL())
{
// pass a temporary stylecontext, the correct one will be set later
rootFrame = NS_NewRootBoxFrame(mPresShell, viewportPseudoStyle);
} else
#endif
{
// pass a temporary stylecontext, the correct one will be set later
rootFrame = NS_NewCanvasFrame(mPresShell, viewportPseudoStyle);
mHasRootAbsPosContainingBlock = true;
}
rootPseudo = nsCSSAnonBoxes::canvas;
mDocElementContainingBlock = rootFrame;
} else {
// Create a page sequence frame
rootFrame = NS_NewSimplePageSequenceFrame(mPresShell, viewportPseudoStyle);
mPageSequenceFrame = rootFrame;
rootPseudo = nsCSSAnonBoxes::pageSequence;
}
// --------- IF SCROLLABLE WRAP IN SCROLLFRAME --------
// If the device supports scrolling (e.g., in galley mode on the screen and
// for print-preview, but not when printing), then create a scroll frame that
// will act as the scrolling mechanism for the viewport.
// XXX Do we even need a viewport when printing to a printer?
// As long as the docshell doesn't prohibit it, and the device supports
// it, create a scroll frame that will act as the scolling mechanism for
// the viewport.
//
// Threre are three possible values stored in the docshell:
// 1) nsIScrollable::Scrollbar_Never = no scrollbars
// 2) nsIScrollable::Scrollbar_Auto = scrollbars appear if needed
// 3) nsIScrollable::Scrollbar_Always = scrollbars always
// Only need to create a scroll frame/view for cases 2 and 3.
bool isHTML = aDocElement->IsHTML();
bool isXUL = false;
if (!isHTML) {
isXUL = aDocElement->IsXUL();
}
// Never create scrollbars for XUL documents
bool isScrollable = isPaginated ? presContext->HasPaginatedScrolling() : !isXUL;
// We no longer need to do overflow propagation here. It's taken care of
// when we construct frames for the element whose overflow might be
// propagated
NS_ASSERTION(!isScrollable || !isXUL,
"XUL documents should never be scrollable - see above");
nsIFrame* newFrame = rootFrame;
nsRefPtr<nsStyleContext> rootPseudoStyle;
// we must create a state because if the scrollbars are GFX it needs the
// state to build the scrollbar frames.
nsFrameConstructorState state(mPresShell, nullptr, nullptr, nullptr);
// Start off with the viewport as parent; we'll adjust it as needed.
nsIFrame* parentFrame = viewportFrame;
nsStyleSet* styleSet = mPresShell->StyleSet();
// If paginated, make sure we don't put scrollbars in
if (!isScrollable) {
rootPseudoStyle = styleSet->ResolveAnonymousBoxStyle(rootPseudo,
viewportPseudoStyle);
} else {
if (rootPseudo == nsCSSAnonBoxes::canvas) {
rootPseudo = nsCSSAnonBoxes::scrolledCanvas;
} else {
NS_ASSERTION(rootPseudo == nsCSSAnonBoxes::pageSequence,
"Unknown root pseudo");
rootPseudo = nsCSSAnonBoxes::scrolledPageSequence;
}
// Build the frame. We give it the content we are wrapping which is the
// document element, the root frame, the parent view port frame, and we
// should get back the new frame and the scrollable view if one was
// created.
// resolve a context for the scrollframe
nsRefPtr<nsStyleContext> styleContext;
styleContext = styleSet->ResolveAnonymousBoxStyle(nsCSSAnonBoxes::viewportScroll,
viewportPseudoStyle);
// Note that the viewport scrollframe is always built with
// overflow:auto style. This forces the scroll frame to create
// anonymous content for both scrollbars. This is necessary even
// if the HTML or BODY elements are overriding the viewport
// scroll style to 'hidden' --- dynamic style changes might put
// scrollbars back on the viewport and we don't want to have to
// reframe the viewport to create the scrollbar content.
newFrame = nullptr;
rootPseudoStyle = BeginBuildingScrollFrame( state,
aDocElement,
styleContext,
viewportFrame,
rootPseudo,
true,
newFrame);
parentFrame = newFrame;
mGfxScrollFrame = newFrame;
}
rootFrame->SetStyleContextWithoutNotification(rootPseudoStyle);
rootFrame->Init(aDocElement, parentFrame, nullptr);
if (isScrollable) {
FinishBuildingScrollFrame(parentFrame, rootFrame);
}
if (isPaginated) { // paginated
// Create the first page
// Set the initial child lists
nsIFrame* canvasFrame;
nsIFrame* pageFrame =
ConstructPageFrame(mPresShell, presContext, rootFrame, nullptr,
canvasFrame);
SetInitialSingleChild(rootFrame, pageFrame);
// The eventual parent of the document element frame.
// XXX should this be set for every new page (in ConstructPageFrame)?
mDocElementContainingBlock = canvasFrame;
mHasRootAbsPosContainingBlock = true;
}
if (viewportFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW) {
SetInitialSingleChild(viewportFrame, newFrame);
} else {
nsFrameList newFrameList(newFrame, newFrame);
viewportFrame->AppendFrames(kPrincipalList, newFrameList);
}
}
nsIFrame*
nsCSSFrameConstructor::ConstructPageFrame(nsIPresShell* aPresShell,
nsPresContext* aPresContext,
nsIFrame* aParentFrame,
nsIFrame* aPrevPageFrame,
nsIFrame*& aCanvasFrame)
{
nsStyleContext* parentStyleContext = aParentFrame->StyleContext();
nsStyleSet *styleSet = aPresShell->StyleSet();
nsRefPtr<nsStyleContext> pagePseudoStyle;
pagePseudoStyle = styleSet->ResolveAnonymousBoxStyle(nsCSSAnonBoxes::page,
parentStyleContext);
nsIFrame* pageFrame = NS_NewPageFrame(aPresShell, pagePseudoStyle);
// Initialize the page frame and force it to have a view. This makes printing of
// the pages easier and faster.
pageFrame->Init(nullptr, aParentFrame, aPrevPageFrame);
nsRefPtr<nsStyleContext> pageContentPseudoStyle;
pageContentPseudoStyle =
styleSet->ResolveAnonymousBoxStyle(nsCSSAnonBoxes::pageContent,
pagePseudoStyle);
nsIFrame* pageContentFrame = NS_NewPageContentFrame(aPresShell, pageContentPseudoStyle);
// Initialize the page content frame and force it to have a view. Also make it the
// containing block for fixed elements which are repeated on every page.
nsIFrame* prevPageContentFrame = nullptr;
if (aPrevPageFrame) {
prevPageContentFrame = aPrevPageFrame->GetFirstPrincipalChild();
NS_ASSERTION(prevPageContentFrame, "missing page content frame");
}
pageContentFrame->Init(nullptr, pageFrame, prevPageContentFrame);
SetInitialSingleChild(pageFrame, pageContentFrame);
mFixedContainingBlock = pageContentFrame;
// Make it an absolute container for fixed-pos elements
mFixedContainingBlock->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
mFixedContainingBlock->MarkAsAbsoluteContainingBlock();
nsRefPtr<nsStyleContext> canvasPseudoStyle;
canvasPseudoStyle = styleSet->ResolveAnonymousBoxStyle(nsCSSAnonBoxes::canvas,
pageContentPseudoStyle);
aCanvasFrame = NS_NewCanvasFrame(aPresShell, canvasPseudoStyle);
nsIFrame* prevCanvasFrame = nullptr;
if (prevPageContentFrame) {
prevCanvasFrame = prevPageContentFrame->GetFirstPrincipalChild();
NS_ASSERTION(prevCanvasFrame, "missing canvas frame");
}
aCanvasFrame->Init(nullptr, pageContentFrame, prevCanvasFrame);
SetInitialSingleChild(pageContentFrame, aCanvasFrame);
return pageFrame;
}
/* static */
nsIFrame*
nsCSSFrameConstructor::CreatePlaceholderFrameFor(nsIPresShell* aPresShell,
nsIContent* aContent,
nsIFrame* aFrame,
nsStyleContext* aStyleContext,
nsIFrame* aParentFrame,
nsIFrame* aPrevInFlow,
nsFrameState aTypeBit)
{
nsRefPtr<nsStyleContext> placeholderStyle = aPresShell->StyleSet()->
ResolveStyleForNonElement(aStyleContext->GetParent());
// The placeholder frame gets a pseudo style context
nsPlaceholderFrame* placeholderFrame =
(nsPlaceholderFrame*)NS_NewPlaceholderFrame(aPresShell, placeholderStyle,
aTypeBit);
placeholderFrame->Init(aContent, aParentFrame, aPrevInFlow);
// The placeholder frame has a pointer back to the out-of-flow frame
placeholderFrame->SetOutOfFlowFrame(aFrame);
aFrame->AddStateBits(NS_FRAME_OUT_OF_FLOW);
// Add mapping from absolutely positioned frame to its placeholder frame
aPresShell->FrameManager()->RegisterPlaceholderFrame(placeholderFrame);
return placeholderFrame;
}
// Clears any lazy bits set in the range [aStartContent, aEndContent). If
// aEndContent is null, that means to clear bits in all siblings starting with
// aStartContent. aStartContent must not be null unless aEndContent is also
// null. We do this so that when new children are inserted under elements whose
// frame is a leaf the new children don't cause us to try to construct frames
// for the existing children again.
static inline void
ClearLazyBits(nsIContent* aStartContent, nsIContent* aEndContent)
{
NS_PRECONDITION(aStartContent || !aEndContent,
"Must have start child if we have an end child");
for (nsIContent* cur = aStartContent; cur != aEndContent;
cur = cur->GetNextSibling()) {
cur->UnsetFlags(NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME);
}
}
nsIFrame*
nsCSSFrameConstructor::ConstructSelectFrame(nsFrameConstructorState& aState,
FrameConstructionItem& aItem,
nsIFrame* aParentFrame,
const nsStyleDisplay* aStyleDisplay,
nsFrameItems& aFrameItems)
{
nsIContent* const content = aItem.mContent;
nsStyleContext* const styleContext = aItem.mStyleContext;
// Construct a frame-based listbox or combobox
dom::HTMLSelectElement* sel = dom::HTMLSelectElement::FromContent(content);
MOZ_ASSERT(sel);
if (sel->IsCombobox()) {
// Construct a frame-based combo box.
// The frame-based combo box is built out of three parts. A display area, a button and
// a dropdown list. The display area and button are created through anonymous content.
// The drop-down list's frame is created explicitly. The combobox frame shares its content
// with the drop-down list.
uint32_t flags = NS_BLOCK_FLOAT_MGR;
nsIFrame* comboboxFrame = NS_NewComboboxControlFrame(mPresShell, styleContext, flags);
// Save the history state so we don't restore during construction
// since the complete tree is required before we restore.
nsILayoutHistoryState *historyState = aState.mFrameState;
aState.mFrameState = nullptr;
// Initialize the combobox frame
InitAndRestoreFrame(aState, content,
aState.GetGeometricParent(aStyleDisplay, aParentFrame),
comboboxFrame);
aState.AddChild(comboboxFrame, aFrameItems, content, styleContext,
aParentFrame);
nsIComboboxControlFrame* comboBox = do_QueryFrame(comboboxFrame);
NS_ASSERTION(comboBox, "NS_NewComboboxControlFrame returned frame that "
"doesn't implement nsIComboboxControlFrame");
// Resolve pseudo element style for the dropdown list
nsRefPtr<nsStyleContext> listStyle;
listStyle = mPresShell->StyleSet()->
ResolveAnonymousBoxStyle(nsCSSAnonBoxes::dropDownList, styleContext);
// Create a listbox
nsIFrame* listFrame = NS_NewListControlFrame(mPresShell, listStyle);
// Notify the listbox that it is being used as a dropdown list.
nsIListControlFrame * listControlFrame = do_QueryFrame(listFrame);
if (listControlFrame) {
listControlFrame->SetComboboxFrame(comboboxFrame);
}
// Notify combobox that it should use the listbox as it's popup
comboBox->SetDropDown(listFrame);
NS_ASSERTION(!listFrame->IsPositioned(),
"Ended up with positioned dropdown list somehow.");
NS_ASSERTION(!listFrame->IsFloating(),
"Ended up with floating dropdown list somehow.");
// Initialize the scroll frame positioned. Note that it is NOT
// initialized as absolutely positioned.
nsIFrame* scrolledFrame = NS_NewSelectsAreaFrame(mPresShell, styleContext, flags);
InitializeSelectFrame(aState, listFrame, scrolledFrame, content,
comboboxFrame, listStyle, true,
aItem.mPendingBinding, aFrameItems);
NS_ASSERTION(listFrame->GetView(), "ListFrame's view is nullptr");
// Create display and button frames from the combobox's anonymous content.
// The anonymous content is appended to existing anonymous content for this
// element (the scrollbars).
nsFrameItems childItems;
CreateAnonymousFrames(aState, content, comboboxFrame,
aItem.mPendingBinding, childItems);
comboboxFrame->SetInitialChildList(kPrincipalList, childItems);
// Initialize the additional popup child list which contains the
// dropdown list frame.
nsFrameItems popupItems;
popupItems.AddChild(listFrame);
comboboxFrame->SetInitialChildList(nsIFrame::kSelectPopupList,
popupItems);
aState.mFrameState = historyState;
if (aState.mFrameState) {
// Restore frame state for the entire subtree of |comboboxFrame|.
RestoreFrameState(comboboxFrame, aState.mFrameState);
}
return comboboxFrame;
}
// Listbox, not combobox
nsIFrame* listFrame = NS_NewListControlFrame(mPresShell, styleContext);
nsIFrame* scrolledFrame = NS_NewSelectsAreaFrame(
mPresShell, styleContext, NS_BLOCK_FLOAT_MGR);
// ******* this code stolen from Initialze ScrollFrame ********
// please adjust this code to use BuildScrollFrame.
InitializeSelectFrame(aState, listFrame, scrolledFrame, content,
aParentFrame, styleContext, false,
aItem.mPendingBinding, aFrameItems);
return listFrame;
}
/**
* Used to be InitializeScrollFrame but now it's only used for the select tag
* But the select tag should really be fixed to use GFX scrollbars that can
* be create with BuildScrollFrame.
*/
nsresult
nsCSSFrameConstructor::InitializeSelectFrame(nsFrameConstructorState& aState,
nsIFrame* scrollFrame,
nsIFrame* scrolledFrame,
nsIContent* aContent,
nsIFrame* aParentFrame,
nsStyleContext* aStyleContext,
bool aBuildCombobox,
PendingBinding* aPendingBinding,
nsFrameItems& aFrameItems)
{
const nsStyleDisplay* display = aStyleContext->StyleDisplay();
// Initialize it
nsIFrame* geometricParent = aState.GetGeometricParent(display, aParentFrame);
// We don't call InitAndRestoreFrame for scrollFrame because we can only
// restore the frame state after its parts have been created (in particular,
// the scrollable view). So we have to split Init and Restore.
// Initialize the frame
scrollFrame->Init(aContent, geometricParent, nullptr);
if (!aBuildCombobox) {
aState.AddChild(scrollFrame, aFrameItems, aContent,
aStyleContext, aParentFrame);
}
if (aBuildCombobox) {
nsContainerFrame::CreateViewForFrame(scrollFrame, true);
}
BuildScrollFrame(aState, aContent, aStyleContext, scrolledFrame,
geometricParent, scrollFrame);
if (aState.mFrameState) {
// Restore frame state for the scroll frame
RestoreFrameStateFor(scrollFrame, aState.mFrameState);
}
// Process children
nsFrameItems childItems;
ProcessChildren(aState, aContent, aStyleContext, scrolledFrame, false,
childItems, false, aPendingBinding);
// Set the scrolled frame's initial child lists
scrolledFrame->SetInitialChildList(kPrincipalList, childItems);
return NS_OK;
}
nsIFrame*
nsCSSFrameConstructor::ConstructFieldSetFrame(nsFrameConstructorState& aState,
FrameConstructionItem& aItem,
nsIFrame* aParentFrame,
const nsStyleDisplay* aStyleDisplay,
nsFrameItems& aFrameItems)
{
nsIContent* const content = aItem.mContent;
nsStyleContext* const styleContext = aItem.mStyleContext;
nsIFrame* newFrame = NS_NewFieldSetFrame(mPresShell, styleContext);
// Initialize it
InitAndRestoreFrame(aState, content,
aState.GetGeometricParent(aStyleDisplay, aParentFrame),
newFrame);
// Resolve style and initialize the frame
nsRefPtr<nsStyleContext> fieldsetContentStyle;
fieldsetContentStyle = mPresShell->StyleSet()->
ResolveAnonymousBoxStyle(nsCSSAnonBoxes::fieldsetContent, styleContext);
nsIFrame* blockFrame = NS_NewBlockFrame(mPresShell, fieldsetContentStyle,
NS_BLOCK_FLOAT_MGR |
NS_BLOCK_MARGIN_ROOT);
InitAndRestoreFrame(aState, content, newFrame, blockFrame);
aState.AddChild(newFrame, aFrameItems, content, styleContext, aParentFrame);
// Process children
nsFrameConstructorSaveState absoluteSaveState;
nsFrameItems childItems;
newFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
if (newFrame->IsPositioned()) {
aState.PushAbsoluteContainingBlock(newFrame, newFrame, absoluteSaveState);
}
ProcessChildren(aState, content, styleContext, blockFrame, true,
childItems, true, aItem.mPendingBinding);
nsFrameItems fieldsetKids;
fieldsetKids.AddChild(blockFrame);
for (nsFrameList::Enumerator e(childItems); !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
if (child->GetContentInsertionFrame()->GetType() == nsGkAtoms::legendFrame) {
// We want the legend to be the first frame in the fieldset child list.
// That way the EventStateManager will do the right thing when tabbing
// from a selection point within the legend (bug 236071), which is
// used for implementing legend access keys (bug 81481).
// GetAdjustedParentFrame() below depends on this frame order.
childItems.RemoveFrame(child);
// Make sure to reparent the legend so it has the fieldset as the parent.
fieldsetKids.InsertFrame(newFrame, nullptr, child);
break;
}
}
// Set the inner frame's initial child lists
blockFrame->SetInitialChildList(kPrincipalList, childItems);
// Set the outer frame's initial child list
newFrame->SetInitialChildList(kPrincipalList, fieldsetKids);
newFrame->AddStateBits(NS_FRAME_MAY_HAVE_GENERATED_CONTENT);
// Our new frame returned is the outer frame, which is the fieldset frame.
return newFrame;
}
static nsIFrame*
FindAncestorWithGeneratedContentPseudo(nsIFrame* aFrame)
{
for (nsIFrame* f = aFrame->GetParent(); f; f = f->GetParent()) {
NS_ASSERTION(f->IsGeneratedContentFrame(),
"should not have exited generated content");
nsIAtom* pseudo = f->StyleContext()->GetPseudo();
if (pseudo == nsCSSPseudoElements::before ||
pseudo == nsCSSPseudoElements::after)
return f;
}
return nullptr;
}
#define SIMPLE_FCDATA(_func) FCDATA_DECL(0, _func)
#define FULL_CTOR_FCDATA(_flags, _func) \
{ _flags | FCDATA_FUNC_IS_FULL_CTOR, { nullptr }, _func, nullptr }
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindTextData(nsIFrame* aParentFrame)
{
if (aParentFrame && IsFrameForSVG(aParentFrame)) {
nsIFrame *ancestorFrame =
nsSVGUtils::GetFirstNonAAncestorFrame(aParentFrame);
if (ancestorFrame) {
if (NS_SVGTextCSSFramesEnabled()) {
static const FrameConstructionData sSVGTextData =
FCDATA_DECL(FCDATA_IS_LINE_PARTICIPANT | FCDATA_IS_SVG_TEXT,
NS_NewTextFrame);
if (ancestorFrame->IsSVGText()) {
return &sSVGTextData;
}
} else {
static const FrameConstructionData sSVGGlyphData =
SIMPLE_FCDATA(NS_NewSVGGlyphFrame);
nsSVGTextContainerFrame* metrics = do_QueryFrame(ancestorFrame);
if (metrics) {
return &sSVGGlyphData;
}
}
}
return nullptr;
}
static const FrameConstructionData sTextData =
FCDATA_DECL(FCDATA_IS_LINE_PARTICIPANT, NS_NewTextFrame);
return &sTextData;
}
void
nsCSSFrameConstructor::ConstructTextFrame(const FrameConstructionData* aData,
nsFrameConstructorState& aState,
nsIContent* aContent,
nsIFrame* aParentFrame,
nsStyleContext* aStyleContext,
nsFrameItems& aFrameItems)
{
NS_PRECONDITION(aData, "Must have frame construction data");
nsIFrame* newFrame = (*aData->mFunc.mCreationFunc)(mPresShell, aStyleContext);
InitAndRestoreFrame(aState, aContent, aParentFrame, newFrame);
// We never need to create a view for a text frame.
if (newFrame->IsGeneratedContentFrame()) {
nsAutoPtr<nsGenConInitializer> initializer;
initializer =
static_cast<nsGenConInitializer*>(
aContent->UnsetProperty(nsGkAtoms::genConInitializerProperty));
if (initializer) {
if (initializer->mNode->InitTextFrame(initializer->mList,
FindAncestorWithGeneratedContentPseudo(newFrame), newFrame)) {
(this->*(initializer->mDirtyAll))();
}
initializer->mNode.forget();
}
}
// Add the newly constructed frame to the flow
aFrameItems.AddChild(newFrame);
if (!aState.mCreatingExtraFrames)
aContent->SetPrimaryFrame(newFrame);
}
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindDataByInt(int32_t aInt,
Element* aElement,
nsStyleContext* aStyleContext,
const FrameConstructionDataByInt* aDataPtr,
uint32_t aDataLength)
{
for (const FrameConstructionDataByInt *curData = aDataPtr,
*endData = aDataPtr + aDataLength;
curData != endData;
++curData) {
if (curData->mInt == aInt) {
const FrameConstructionData* data = &curData->mData;
if (data->mBits & FCDATA_FUNC_IS_DATA_GETTER) {
return data->mFunc.mDataGetter(aElement, aStyleContext);
}
return data;
}
}
return nullptr;
}
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindDataByTag(nsIAtom* aTag,
Element* aElement,
nsStyleContext* aStyleContext,
const FrameConstructionDataByTag* aDataPtr,
uint32_t aDataLength)
{
for (const FrameConstructionDataByTag *curData = aDataPtr,
*endData = aDataPtr + aDataLength;
curData != endData;
++curData) {
if (*curData->mTag == aTag) {
const FrameConstructionData* data = &curData->mData;
if (data->mBits & FCDATA_FUNC_IS_DATA_GETTER) {
return data->mFunc.mDataGetter(aElement, aStyleContext);
}
return data;
}
}
return nullptr;
}
#define SUPPRESS_FCDATA() FCDATA_DECL(FCDATA_SUPPRESS_FRAME, nullptr)
#define SIMPLE_INT_CREATE(_int, _func) { _int, SIMPLE_FCDATA(_func) }
#define SIMPLE_INT_CHAIN(_int, _func) \
{ _int, FCDATA_DECL(FCDATA_FUNC_IS_DATA_GETTER, _func) }
#define COMPLEX_INT_CREATE(_int, _func) \
{ _int, FULL_CTOR_FCDATA(0, _func) }
#define SIMPLE_TAG_CREATE(_tag, _func) \
{ &nsGkAtoms::_tag, SIMPLE_FCDATA(_func) }
#define SIMPLE_TAG_CHAIN(_tag, _func) \
{ &nsGkAtoms::_tag, FCDATA_DECL(FCDATA_FUNC_IS_DATA_GETTER, _func) }
#define COMPLEX_TAG_CREATE(_tag, _func) \
{ &nsGkAtoms::_tag, FULL_CTOR_FCDATA(0, _func) }
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindHTMLData(Element* aElement,
nsIAtom* aTag,
int32_t aNameSpaceID,
nsIFrame* aParentFrame,
nsStyleContext* aStyleContext)
{
// Ignore the tag if it's not HTML content and if it doesn't extend (via XBL)
// a valid HTML namespace. This check must match the one in
// ShouldHaveFirstLineStyle.
if (aNameSpaceID != kNameSpaceID_XHTML) {
return nullptr;
}
NS_ASSERTION(!aParentFrame ||
aParentFrame->StyleContext()->GetPseudo() !=
nsCSSAnonBoxes::fieldsetContent ||
aParentFrame->GetParent()->GetType() == nsGkAtoms::fieldSetFrame,
"Unexpected parent for fieldset content anon box");
if (aTag == nsGkAtoms::legend &&
(!aParentFrame ||
(aParentFrame->GetType() != nsGkAtoms::fieldSetFrame &&
aParentFrame->StyleContext()->GetPseudo() !=
nsCSSAnonBoxes::fieldsetContent) ||
!aElement->GetParent() ||
!aElement->GetParent()->IsHTML(nsGkAtoms::fieldset) ||
aStyleContext->StyleDisplay()->IsFloatingStyle() ||
aStyleContext->StyleDisplay()->IsAbsolutelyPositionedStyle())) {
// <legend> is only special inside fieldset, check both the frame tree
// parent and content tree parent due to XBL issues. For floated or
// absolutely positioned legends we want to construct by display type and
// not do special legend stuff.
// XXXbz it would be nice if we could just decide this based on the parent
// tag, and hence just use a SIMPLE_TAG_CHAIN for legend below, but the
// fact that with XBL we could end up with this legend element in some
// totally weird insertion point makes that chancy, I think.
return nullptr;
}
static const FrameConstructionDataByTag sHTMLData[] = {
SIMPLE_TAG_CHAIN(img, nsCSSFrameConstructor::FindImgData),
SIMPLE_TAG_CHAIN(mozgeneratedcontentimage,
nsCSSFrameConstructor::FindImgData),
{ &nsGkAtoms::br,
FCDATA_DECL(FCDATA_IS_LINE_PARTICIPANT | FCDATA_IS_LINE_BREAK,
NS_NewBRFrame) },
SIMPLE_TAG_CREATE(wbr, NS_NewWBRFrame),
SIMPLE_TAG_CHAIN(input, nsCSSFrameConstructor::FindInputData),
SIMPLE_TAG_CREATE(textarea, NS_NewTextControlFrame),
COMPLEX_TAG_CREATE(select, &nsCSSFrameConstructor::ConstructSelectFrame),
SIMPLE_TAG_CHAIN(object, nsCSSFrameConstructor::FindObjectData),
SIMPLE_TAG_CHAIN(applet, nsCSSFrameConstructor::FindObjectData),
SIMPLE_TAG_CHAIN(embed, nsCSSFrameConstructor::FindObjectData),
COMPLEX_TAG_CREATE(fieldset,
&nsCSSFrameConstructor::ConstructFieldSetFrame),
{ &nsGkAtoms::legend,
FCDATA_DECL(FCDATA_ALLOW_BLOCK_STYLES | FCDATA_MAY_NEED_SCROLLFRAME,
NS_NewLegendFrame) },
SIMPLE_TAG_CREATE(frameset, NS_NewHTMLFramesetFrame),
SIMPLE_TAG_CREATE(iframe, NS_NewSubDocumentFrame),
{ &nsGkAtoms::button,
FCDATA_WITH_WRAPPING_BLOCK(FCDATA_ALLOW_BLOCK_STYLES,
NS_NewHTMLButtonControlFrame,
nsCSSAnonBoxes::buttonContent) },
SIMPLE_TAG_CHAIN(canvas, nsCSSFrameConstructor::FindCanvasData),
SIMPLE_TAG_CREATE(video, NS_NewHTMLVideoFrame),
SIMPLE_TAG_CREATE(audio, NS_NewHTMLVideoFrame),
SIMPLE_TAG_CREATE(progress, NS_NewProgressFrame),
SIMPLE_TAG_CREATE(meter, NS_NewMeterFrame)
};
return FindDataByTag(aTag, aElement, aStyleContext, sHTMLData,
ArrayLength(sHTMLData));
}
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindImgData(Element* aElement,
nsStyleContext* aStyleContext)
{
if (!nsImageFrame::ShouldCreateImageFrameFor(aElement, aStyleContext)) {
return nullptr;
}
static const FrameConstructionData sImgData = SIMPLE_FCDATA(NS_NewImageFrame);
return &sImgData;
}
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindImgControlData(Element* aElement,
nsStyleContext* aStyleContext)
{
if (!nsImageFrame::ShouldCreateImageFrameFor(aElement, aStyleContext)) {
return nullptr;
}
static const FrameConstructionData sImgControlData =
SIMPLE_FCDATA(NS_NewImageControlFrame);
return &sImgControlData;
}
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindInputData(Element* aElement,
nsStyleContext* aStyleContext)
{
static const FrameConstructionDataByInt sInputData[] = {
SIMPLE_INT_CREATE(NS_FORM_INPUT_CHECKBOX, NS_NewGfxCheckboxControlFrame),
SIMPLE_INT_CREATE(NS_FORM_INPUT_RADIO, NS_NewGfxRadioControlFrame),
SIMPLE_INT_CREATE(NS_FORM_INPUT_FILE, NS_NewFileControlFrame),
SIMPLE_INT_CHAIN(NS_FORM_INPUT_IMAGE,
nsCSSFrameConstructor::FindImgControlData),
SIMPLE_INT_CREATE(NS_FORM_INPUT_EMAIL, NS_NewTextControlFrame),
SIMPLE_INT_CREATE(NS_FORM_INPUT_SEARCH, NS_NewTextControlFrame),
SIMPLE_INT_CREATE(NS_FORM_INPUT_TEXT, NS_NewTextControlFrame),
SIMPLE_INT_CREATE(NS_FORM_INPUT_TEL, NS_NewTextControlFrame),
SIMPLE_INT_CREATE(NS_FORM_INPUT_URL, NS_NewTextControlFrame),
SIMPLE_INT_CREATE(NS_FORM_INPUT_RANGE, NS_NewRangeFrame),
SIMPLE_INT_CREATE(NS_FORM_INPUT_PASSWORD, NS_NewTextControlFrame),
{ NS_FORM_INPUT_COLOR,
FCDATA_WITH_WRAPPING_BLOCK(0, NS_NewColorControlFrame,
nsCSSAnonBoxes::buttonContent) },
// TODO: this is temporary until a frame is written: bug 635240.
SIMPLE_INT_CREATE(NS_FORM_INPUT_NUMBER, NS_NewTextControlFrame),
// TODO: this is temporary until a frame is written: bug 773205.
SIMPLE_INT_CREATE(NS_FORM_INPUT_DATE, NS_NewTextControlFrame),
// TODO: this is temporary until a frame is written: bug 773205
SIMPLE_INT_CREATE(NS_FORM_INPUT_TIME, NS_NewTextControlFrame),
{ NS_FORM_INPUT_SUBMIT,
FCDATA_WITH_WRAPPING_BLOCK(0, NS_NewGfxButtonControlFrame,
nsCSSAnonBoxes::buttonContent) },
{ NS_FORM_INPUT_RESET,
FCDATA_WITH_WRAPPING_BLOCK(0, NS_NewGfxButtonControlFrame,
nsCSSAnonBoxes::buttonContent) },
{ NS_FORM_INPUT_BUTTON,
FCDATA_WITH_WRAPPING_BLOCK(0, NS_NewGfxButtonControlFrame,
nsCSSAnonBoxes::buttonContent) }
// Keeping hidden inputs out of here on purpose for so they get frames by
// display (in practice, none).
};
nsCOMPtr<nsIFormControl> control = do_QueryInterface(aElement);
NS_ASSERTION(control, "input doesn't implement nsIFormControl?");
return FindDataByInt(control->GetType(), aElement, aStyleContext,
sInputData, ArrayLength(sInputData));
}
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindObjectData(Element* aElement,
nsStyleContext* aStyleContext)
{
// GetDisplayedType isn't necessarily nsIObjectLoadingContent::TYPE_NULL for
// cases when the object is broken/suppressed/etc (e.g. a broken image), but
// we want to treat those cases as TYPE_NULL
uint32_t type;
if (aElement->State().HasAtLeastOneOfStates(NS_EVENT_STATE_BROKEN |
NS_EVENT_STATE_USERDISABLED |
NS_EVENT_STATE_SUPPRESSED)) {
type = nsIObjectLoadingContent::TYPE_NULL;
} else {
nsCOMPtr<nsIObjectLoadingContent> objContent(do_QueryInterface(aElement));
NS_ASSERTION(objContent,
"applet, embed and object must implement "
"nsIObjectLoadingContent!");
objContent->GetDisplayedType(&type);
}
static const FrameConstructionDataByInt sObjectData[] = {
SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_LOADING,
NS_NewEmptyFrame),
SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_PLUGIN,
NS_NewObjectFrame),
SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_IMAGE,
NS_NewImageFrame),
SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_DOCUMENT,
NS_NewSubDocumentFrame)
// Nothing for TYPE_NULL so we'll construct frames by display there
};
return FindDataByInt((int32_t)type, aElement, aStyleContext,
sObjectData, ArrayLength(sObjectData));
}
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindCanvasData(Element* aElement,
nsStyleContext* aStyleContext)
{
// We want to check whether script is enabled on the document that
// could be painting to the canvas. That's the owner document of
// the canvas, except when the owner document is a static document,
// in which case it's the original document it was cloned from.
nsIDocument* doc = aElement->OwnerDoc();
if (doc->IsStaticDocument()) {
doc = doc->GetOriginalDocument();
}
if (!doc->IsScriptEnabled()) {
return nullptr;
}
static const FrameConstructionData sCanvasData =
FCDATA_WITH_WRAPPING_BLOCK(0, NS_NewHTMLCanvasFrame,
nsCSSAnonBoxes::htmlCanvasContent);
return &sCanvasData;
}
void
nsCSSFrameConstructor::ConstructFrameFromItemInternal(FrameConstructionItem& aItem,
nsFrameConstructorState& aState,
nsIFrame* aParentFrame,
nsFrameItems& aFrameItems)
{
const FrameConstructionData* data = aItem.mFCData;
NS_ASSERTION(data, "Must have frame construction data");
uint32_t bits = data->mBits;
NS_ASSERTION(!(bits & FCDATA_FUNC_IS_DATA_GETTER),
"Should have dealt with this inside the data finder");
// Some sets of bits are not compatible with each other
#define CHECK_ONLY_ONE_BIT(_bit1, _bit2) \
NS_ASSERTION(!(bits & _bit1) || !(bits & _bit2), \
"Only one of these bits should be set")
CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_FORCE_NULL_ABSPOS_CONTAINER);
CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_WRAP_KIDS_IN_BLOCKS);
CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_MAY_NEED_SCROLLFRAME);
CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_IS_POPUP);
CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_SKIP_ABSPOS_PUSH);
CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR,
FCDATA_DISALLOW_GENERATED_CONTENT);
CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_ALLOW_BLOCK_STYLES);
CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR,
FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS);
CHECK_ONLY_ONE_BIT(FCDATA_WRAP_KIDS_IN_BLOCKS,
FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS);
#undef CHECK_ONLY_ONE_BIT
NS_ASSERTION(!(bits & FCDATA_FORCED_NON_SCROLLABLE_BLOCK) ||
((bits & FCDATA_FUNC_IS_FULL_CTOR) &&
data->mFullConstructor ==
&nsCSSFrameConstructor::ConstructNonScrollableBlock),
"Unexpected FCDATA_FORCED_NON_SCROLLABLE_BLOCK flag");
// Don't create a subdocument frame for iframes if we're creating extra frames
if (aState.mCreatingExtraFrames && aItem.mContent->IsHTML() &&
aItem.mContent->Tag() == nsGkAtoms::iframe)
{
return;
}
nsStyleContext* const styleContext = aItem.mStyleContext;
const nsStyleDisplay* display = styleContext->StyleDisplay();
nsIContent* const content = aItem.mContent;
// Get the parent of the content and check if it is a XBL children element.
// Push the children element as an ancestor here because it does
// not have a frame and would not otherwise be pushed as an ancestor. It is
// necessary to do so in order to correctly handle style resolution on
// descendants.
nsIContent* parent = content->GetParent();
bool pushInsertionPoint = aState.mTreeMatchContext.mAncestorFilter.HasFilter() &&
parent && parent->IsActiveChildrenElement();
TreeMatchContext::AutoAncestorPusher
insertionPointPusher(pushInsertionPoint,
aState.mTreeMatchContext,
parent && parent->IsElement() ? parent->AsElement() : nullptr);
// Push the content as a style ancestor now, so we don't have to do
// it in our various full-constructor functions. In particular,
// since a number of full-constructor functions don't actually call
// ProcessChildren in some cases (e.g. for CSS anonymous table boxes
// or for situations where only anonymouse children are having
// frames constructed), this is the best place to bottleneck the
// pushing of the content instead of having to do it in multiple
// places.
TreeMatchContext::AutoAncestorPusher
ancestorPusher(aState.mTreeMatchContext.mAncestorFilter.HasFilter(),
aState.mTreeMatchContext,
content->IsElement() ? content->AsElement() : nullptr);
nsIFrame* newFrame;
nsIFrame* primaryFrame;
if (bits & FCDATA_FUNC_IS_FULL_CTOR) {
newFrame =
(this->*(data->mFullConstructor))(aState, aItem, aParentFrame,
display, aFrameItems);
MOZ_ASSERT(newFrame, "Full constructor failed");
primaryFrame = newFrame;
} else {
newFrame =
(*data->mFunc.mCreationFunc)(mPresShell, styleContext);
bool allowOutOfFlow = !(bits & FCDATA_DISALLOW_OUT_OF_FLOW);
bool isPopup = aItem.mIsPopup;
NS_ASSERTION(!isPopup ||
(aState.mPopupItems.containingBlock &&
aState.mPopupItems.containingBlock->GetType() ==
nsGkAtoms::popupSetFrame),
"Should have a containing block here!");
nsIFrame* geometricParent =
isPopup ? aState.mPopupItems.containingBlock :
(allowOutOfFlow ? aState.GetGeometricParent(display, aParentFrame)
: aParentFrame);
// Must init frameToAddToList to null, since it's inout
nsIFrame* frameToAddToList = nullptr;
if ((bits & FCDATA_MAY_NEED_SCROLLFRAME) &&
display->IsScrollableOverflow()) {
BuildScrollFrame(aState, content, styleContext, newFrame,
geometricParent, frameToAddToList);
} else {
InitAndRestoreFrame(aState, content, geometricParent, newFrame);
// See whether we need to create a view
nsContainerFrame::CreateViewForFrame(newFrame, false);
frameToAddToList = newFrame;
}
// Use frameToAddToList as the primary frame. In the non-scrollframe case
// they're equal, but in the scrollframe case newFrame is the scrolled
// frame, while frameToAddToList is the scrollframe (and should be the
// primary frame).
primaryFrame = frameToAddToList;
// If we need to create a block formatting context to wrap our
// kids, do it now.
const nsStyleDisplay* maybeAbsoluteContainingBlockDisplay = display;
nsIFrame* maybeAbsoluteContainingBlock = newFrame;
nsIFrame* possiblyLeafFrame = newFrame;
if (bits & FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS) {
nsRefPtr<nsStyleContext> blockContext;
blockContext =
mPresShell->StyleSet()->ResolveAnonymousBoxStyle(*data->mAnonBoxPseudo,
styleContext);
nsIFrame* blockFrame =
NS_NewBlockFormattingContext(mPresShell, blockContext);
InitAndRestoreFrame(aState, content, newFrame, blockFrame);
SetInitialSingleChild(newFrame, blockFrame);
// Now figure out whether newFrame or blockFrame should be the
// absolute container. It should be the latter if it's
// positioned, otherwise the former.
const nsStyleDisplay* blockDisplay = blockContext->StyleDisplay();
if (blockDisplay->IsPositioned(blockFrame)) {
maybeAbsoluteContainingBlockDisplay = blockDisplay;
maybeAbsoluteContainingBlock = blockFrame;
}
// Our kids should go into the blockFrame
newFrame = blockFrame;
}
aState.AddChild(frameToAddToList, aFrameItems, content, styleContext,
aParentFrame, allowOutOfFlow, allowOutOfFlow, isPopup);
#ifdef MOZ_XUL
// Icky XUL stuff, sadly
if (aItem.mIsRootPopupgroup) {
NS_ASSERTION(nsIRootBox::GetRootBox(mPresShell) &&
nsIRootBox::GetRootBox(mPresShell)->GetPopupSetFrame() ==
newFrame,
"Unexpected PopupSetFrame");
aState.mPopupItems.containingBlock = newFrame;
aState.mHavePendingPopupgroup = false;
}
#endif /* MOZ_XUL */
// Process the child content if requested
nsFrameItems childItems;
nsFrameConstructorSaveState absoluteSaveState;
if (bits & FCDATA_FORCE_NULL_ABSPOS_CONTAINER) {
aState.PushAbsoluteContainingBlock(nullptr, nullptr, absoluteSaveState);
} else if (!(bits & FCDATA_SKIP_ABSPOS_PUSH)) {
nsIFrame* cb = maybeAbsoluteContainingBlock;
cb->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
if ((maybeAbsoluteContainingBlockDisplay->IsAbsolutelyPositionedStyle() ||
maybeAbsoluteContainingBlockDisplay->IsRelativelyPositionedStyle() ||
(maybeAbsoluteContainingBlockDisplay->HasTransformStyle() &&
cb->IsFrameOfType(nsIFrame::eSupportsCSSTransforms))) &&
!cb->IsSVGText()) {
aState.PushAbsoluteContainingBlock(cb, primaryFrame, absoluteSaveState);
}
}
if (!aItem.mAnonChildren.IsEmpty()) {
NS_ASSERTION(!(bits & FCDATA_USE_CHILD_ITEMS),
"We should not have both anonymous and non-anonymous "
"children in a given FrameConstructorItem");
AddFCItemsForAnonymousContent(aState, newFrame, aItem.mAnonChildren,
aItem.mChildItems);
bits |= FCDATA_USE_CHILD_ITEMS;
}
if (bits & FCDATA_USE_CHILD_ITEMS) {
nsFrameConstructorSaveState floatSaveState;
if (ShouldSuppressFloatingOfDescendants(newFrame)) {
aState.PushFloatContainingBlock(nullptr, floatSaveState);
} else if (newFrame->IsFloatContainingBlock()) {
aState.PushFloatContainingBlock(newFrame, floatSaveState);
}
ConstructFramesFromItemList(aState, aItem.mChildItems, newFrame,
childItems);
} else {
// Process the child frames.
ProcessChildren(aState, content, styleContext, newFrame,
!(bits & FCDATA_DISALLOW_GENERATED_CONTENT),
childItems,
(bits & FCDATA_ALLOW_BLOCK_STYLES) != 0,
aItem.mPendingBinding, possiblyLeafFrame);
}
#ifdef MOZ_XUL
// More icky XUL stuff
if (aItem.mNameSpaceID == kNameSpaceID_XUL &&
(aItem.mTag == nsGkAtoms::treechildren || // trees always need titletips
content->HasAttr(kNameSpaceID_None, nsGkAtoms::tooltiptext) ||
content->HasAttr(kNameSpaceID_None, nsGkAtoms::tooltip))) {
nsIRootBox* rootBox = nsIRootBox::GetRootBox(mPresShell);
if (rootBox) {
rootBox->AddTooltipSupport(content);
}
}
#endif
if (bits & FCDATA_WRAP_KIDS_IN_BLOCKS) {
nsFrameItems newItems;
nsFrameItems currentBlockItems;
nsIFrame* f;
while ((f = childItems.FirstChild()) != nullptr) {
bool wrapFrame = IsInlineFrame(f) || IsFrameSpecial(f);
if (!wrapFrame) {
FlushAccumulatedBlock(aState, content, newFrame,
currentBlockItems, newItems);
}
childItems.RemoveFrame(f);
if (wrapFrame) {
currentBlockItems.AddChild(f);
} else {
newItems.AddChild(f);
}
}
FlushAccumulatedBlock(aState, content, newFrame,
currentBlockItems, newItems);
if (childItems.NotEmpty()) {
// an error must have occurred, delete unprocessed frames
childItems.DestroyFrames();
}
childItems = newItems;
}
// Set the frame's initial child list
// Note that MathML depends on this being called even if
// childItems is empty!
newFrame->SetInitialChildList(kPrincipalList, childItems);
}
NS_ASSERTION(newFrame->IsFrameOfType(nsIFrame::eLineParticipant) ==
((bits & FCDATA_IS_LINE_PARTICIPANT) != 0),
"Incorrectly set FCDATA_IS_LINE_PARTICIPANT bits");
// Even if mCreatingExtraFrames is set, we may need to SetPrimaryFrame for
// generated content that doesn't have one yet. Note that we have to examine
// the frame bit, because by this point mIsGeneratedContent has been cleared
// on aItem.
if ((!aState.mCreatingExtraFrames ||
((primaryFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT) &&
!aItem.mContent->GetPrimaryFrame())) &&
!(bits & FCDATA_SKIP_FRAMESET)) {
aItem.mContent->SetPrimaryFrame(primaryFrame);
}
}
// after the node has been constructed and initialized create any
// anonymous content a node needs.
nsresult
nsCSSFrameConstructor::CreateAnonymousFrames(nsFrameConstructorState& aState,
nsIContent* aParent,
nsIFrame* aParentFrame,
PendingBinding* aPendingBinding,
nsFrameItems& aChildItems)
{
nsAutoTArray<nsIAnonymousContentCreator::ContentInfo, 4> newAnonymousItems;
nsresult rv = GetAnonymousContent(aParent, aParentFrame, newAnonymousItems);
NS_ENSURE_SUCCESS(rv, rv);
uint32_t count = newAnonymousItems.Length();
if (count == 0) {
return NS_OK;
}
nsFrameConstructorState::PendingBindingAutoPusher pusher(aState,
aPendingBinding);
TreeMatchContext::AutoAncestorPusher
ancestorPusher(aState.mTreeMatchContext.mAncestorFilter.HasFilter(),
aState.mTreeMatchContext,
aParent->AsElement());
nsIAnonymousContentCreator* creator = do_QueryFrame(aParentFrame);
NS_ASSERTION(creator,
"How can that happen if we have nodes to construct frames for?");
for (uint32_t i=0; i < count; i++) {
nsIContent* content = newAnonymousItems[i].mContent;
NS_ASSERTION(content, "null anonymous content?");
NS_ASSERTION(!newAnonymousItems[i].mStyleContext, "Unexpected style context");
NS_ASSERTION(newAnonymousItems[i].mChildren.IsEmpty(),
"This method is not currently used with frames that implement "
"nsIAnonymousContentCreator::CreateAnonymousContent to "
"output a list where the items have their own children");
nsIFrame* newFrame = creator->CreateFrameFor(content);
if (newFrame) {
NS_ASSERTION(content->GetPrimaryFrame(),
"Content must have a primary frame now");
aChildItems.AddChild(newFrame);
}
else {
// create the frame and attach it to our frame
ConstructFrame(aState, content, aParentFrame, aChildItems);
}
}
return NS_OK;
}
static void
SetFlagsOnSubtree(nsIContent *aNode, uintptr_t aFlagsToSet)
{
#ifdef DEBUG
// Make sure that the node passed to us doesn't have any XBL children
{
FlattenedChildIterator iter(aNode);
NS_ASSERTION(!iter.XBLInvolved() || !iter.GetNextChild(),
"The node should not have any XBL children");
}
#endif
// Set the flag on the node itself
aNode->SetFlags(aFlagsToSet);
// Set the flag on all of its children recursively
uint32_t count;
nsIContent * const *children = aNode->GetChildArray(&count);
for (uint32_t index = 0; index < count; ++index) {
SetFlagsOnSubtree(children[index], aFlagsToSet);
}
}
/**
* This function takes a tree of nsIAnonymousContentCreator::ContentInfo
* objects where the nsIContent nodes have just been created, and appends the
* nsIContent children in the tree to their parent. The leaf nsIContent objects
* are appended first to minimize the number of notifications that are sent
* out (i.e. by appending as many descendants as posible while their parent is
* not yet in the document tree).
*
* This function is used simply as a convenience so that implementations of
* nsIAnonymousContentCreator::CreateAnonymousContent don't all have to have
* their own code to connect the elements that they create.
*/
static void
ConnectAnonymousTreeDescendants(nsIContent* aParent,
nsTArray<nsIAnonymousContentCreator::ContentInfo>& aContent)
{
uint32_t count = aContent.Length();
for (uint32_t i=0; i < count; i++) {
nsIContent* content = aContent[i].mContent;
NS_ASSERTION(content, "null anonymous content?");
ConnectAnonymousTreeDescendants(content, aContent[i].mChildren);
aParent->AppendChildTo(content, false);
}
}
nsresult
nsCSSFrameConstructor::GetAnonymousContent(nsIContent* aParent,
nsIFrame* aParentFrame,
nsTArray<nsIAnonymousContentCreator::ContentInfo>& aContent)
{
nsIAnonymousContentCreator* creator = do_QueryFrame(aParentFrame);
if (!creator)
return NS_OK;
nsresult rv = creator->CreateAnonymousContent(aContent);
NS_ENSURE_SUCCESS(rv, rv);
uint32_t count = aContent.Length();
for (uint32_t i=0; i < count; i++) {
// get our child's content and set its parent to our content
nsIContent* content = aContent[i].mContent;
NS_ASSERTION(content, "null anonymous content?");
// least-surprise CSS binding until we do the SVG specified
// cascading rules for <svg:use> - bug 265894
if (aParentFrame->GetType() == nsGkAtoms::svgUseFrame) {
content->SetFlags(NODE_IS_ANONYMOUS_ROOT);
} else {
content->SetIsNativeAnonymousRoot();
}
ConnectAnonymousTreeDescendants(content, aContent[i].mChildren);
bool anonContentIsEditable = content->HasFlag(NODE_IS_EDITABLE);
rv = content->BindToTree(mDocument, aParent, aParent, true);
// If the anonymous content creator requested that the content should be
// editable, honor its request.
// We need to set the flag on the whole subtree, because existing
// children's flags have already been set as part of the BindToTree operation.
if (anonContentIsEditable) {
NS_ASSERTION(aParentFrame->GetType() == nsGkAtoms::textInputFrame,
"We only expect this for anonymous content under a text control frame");
SetFlagsOnSubtree(content, NODE_IS_EDITABLE);
}
if (NS_FAILED(rv)) {
content->UnbindFromTree();
return rv;
}
}
return NS_OK;
}
static
bool IsXULDisplayType(const nsStyleDisplay* aDisplay)
{
return (aDisplay->mDisplay == NS_STYLE_DISPLAY_INLINE_BOX ||
#ifdef MOZ_XUL
aDisplay->mDisplay == NS_STYLE_DISPLAY_INLINE_GRID ||
aDisplay->mDisplay == NS_STYLE_DISPLAY_INLINE_STACK ||
#endif
aDisplay->mDisplay == NS_STYLE_DISPLAY_BOX
#ifdef MOZ_XUL
|| aDisplay->mDisplay == NS_STYLE_DISPLAY_GRID ||
aDisplay->mDisplay == NS_STYLE_DISPLAY_STACK ||
aDisplay->mDisplay == NS_STYLE_DISPLAY_GRID_GROUP ||
aDisplay->mDisplay == NS_STYLE_DISPLAY_GRID_LINE ||
aDisplay->mDisplay == NS_STYLE_DISPLAY_DECK ||
aDisplay->mDisplay == NS_STYLE_DISPLAY_POPUP ||
aDisplay->mDisplay == NS_STYLE_DISPLAY_GROUPBOX
#endif
);
}
// XUL frames are not allowed to be out of flow.
#define SIMPLE_XUL_FCDATA(_func) \
FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH, \
_func)
#define SCROLLABLE_XUL_FCDATA(_func) \
FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH | \
FCDATA_MAY_NEED_SCROLLFRAME, _func)
// .. but we allow some XUL frames to be _containers_ for out-of-flow content
// (This is the same as SCROLLABLE_XUL_FCDATA, but w/o FCDATA_SKIP_ABSPOS_PUSH)
#define SCROLLABLE_ABSPOS_CONTAINER_XUL_FCDATA(_func) \
FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | \
FCDATA_MAY_NEED_SCROLLFRAME, _func)
#define SIMPLE_XUL_CREATE(_tag, _func) \
{ &nsGkAtoms::_tag, SIMPLE_XUL_FCDATA(_func) }
#define SCROLLABLE_XUL_CREATE(_tag, _func) \
{ &nsGkAtoms::_tag, SCROLLABLE_XUL_FCDATA(_func) }
#define SIMPLE_XUL_INT_CREATE(_int, _func) \
{ _int, SIMPLE_XUL_FCDATA(_func) }
#define SCROLLABLE_XUL_INT_CREATE(_int, _func) \
{ _int, SCROLLABLE_XUL_FCDATA(_func) }
#define SCROLLABLE_ABSPOS_CONTAINER_XUL_INT_CREATE(_int, _func) \
{ _int, SCROLLABLE_ABSPOS_CONTAINER_XUL_FCDATA(_func) }
static
nsIFrame* NS_NewGridBoxFrame(nsIPresShell* aPresShell,
nsStyleContext* aStyleContext)
{
nsCOMPtr<nsBoxLayout> layout;
NS_NewGridLayout2(aPresShell, getter_AddRefs(layout));
return NS_NewBoxFrame(aPresShell, aStyleContext, false, layout);
}
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindXULTagData(Element* aElement,
nsIAtom* aTag,
int32_t aNameSpaceID,
nsStyleContext* aStyleContext)
{
if (aNameSpaceID != kNameSpaceID_XUL) {
return nullptr;
}
static const FrameConstructionDataByTag sXULTagData[] = {
#ifdef MOZ_XUL
SCROLLABLE_XUL_CREATE(button, NS_NewButtonBoxFrame),
SCROLLABLE_XUL_CREATE(checkbox, NS_NewButtonBoxFrame),
SCROLLABLE_XUL_CREATE(radio, NS_NewButtonBoxFrame),
SCROLLABLE_XUL_CREATE(autorepeatbutton, NS_NewAutoRepeatBoxFrame),
SCROLLABLE_XUL_CREATE(titlebar, NS_NewTitleBarFrame),
SCROLLABLE_XUL_CREATE(resizer, NS_NewResizerFrame),
SIMPLE_XUL_CREATE(image, NS_NewImageBoxFrame),
SIMPLE_XUL_CREATE(spring, NS_NewLeafBoxFrame),
SIMPLE_XUL_CREATE(spacer, NS_NewLeafBoxFrame),
SIMPLE_XUL_CREATE(treechildren, NS_NewTreeBodyFrame),
SIMPLE_XUL_CREATE(treecol, NS_NewTreeColFrame),
SIMPLE_XUL_CREATE(text, NS_NewTextBoxFrame),
SIMPLE_TAG_CHAIN(label, nsCSSFrameConstructor::FindXULLabelData),
SIMPLE_TAG_CHAIN(description, nsCSSFrameConstructor::FindXULDescriptionData),
SIMPLE_XUL_CREATE(menu, NS_NewMenuFrame),
SIMPLE_XUL_CREATE(menubutton, NS_NewMenuFrame),
SIMPLE_XUL_CREATE(menuitem, NS_NewMenuItemFrame),
#ifdef XP_MACOSX
SIMPLE_TAG_CHAIN(menubar, nsCSSFrameConstructor::FindXULMenubarData),
#else
SIMPLE_XUL_CREATE(menubar, NS_NewMenuBarFrame),
#endif /* XP_MACOSX */
SIMPLE_TAG_CHAIN(popupgroup, nsCSSFrameConstructor::FindPopupGroupData),
SIMPLE_XUL_CREATE(iframe, NS_NewSubDocumentFrame),
SIMPLE_XUL_CREATE(editor, NS_NewSubDocumentFrame),
SIMPLE_XUL_CREATE(browser, NS_NewSubDocumentFrame),
SIMPLE_XUL_CREATE(progressmeter, NS_NewProgressMeterFrame),
SIMPLE_XUL_CREATE(splitter, NS_NewSplitterFrame),
SIMPLE_TAG_CHAIN(listboxbody,
nsCSSFrameConstructor::FindXULListBoxBodyData),
SIMPLE_TAG_CHAIN(listitem, nsCSSFrameConstructor::FindXULListItemData),
#endif /* MOZ_XUL */
SIMPLE_XUL_CREATE(slider, NS_NewSliderFrame),
SIMPLE_XUL_CREATE(scrollbar, NS_NewScrollbarFrame),
SIMPLE_XUL_CREATE(scrollbarbutton, NS_NewScrollbarButtonFrame)
};
return FindDataByTag(aTag, aElement, aStyleContext, sXULTagData,
ArrayLength(sXULTagData));
}
#ifdef MOZ_XUL
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindPopupGroupData(Element* aElement,
nsStyleContext* /* unused */)
{
if (!aElement->IsRootOfNativeAnonymousSubtree()) {
return nullptr;
}
static const FrameConstructionData sPopupSetData =
SIMPLE_XUL_FCDATA(NS_NewPopupSetFrame);
return &sPopupSetData;
}
/* static */
const nsCSSFrameConstructor::FrameConstructionData
nsCSSFrameConstructor::sXULTextBoxData = SIMPLE_XUL_FCDATA(NS_NewTextBoxFrame);
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindXULLabelData(Element* aElement,
nsStyleContext* /* unused */)
{
if (aElement->HasAttr(kNameSpaceID_None, nsGkAtoms::value)) {
return &sXULTextBoxData;
}
static const FrameConstructionData sLabelData =
SIMPLE_XUL_FCDATA(NS_NewXULLabelFrame);
return &sLabelData;
}
static nsIFrame*
NS_NewXULDescriptionFrame(nsIPresShell* aPresShell, nsStyleContext *aContext)
{
// XXXbz do we really need to set those flags? If the parent is not
// a block we'll get them anyway, and if it is, do we want them?
return NS_NewBlockFrame(aPresShell, aContext,
NS_BLOCK_FLOAT_MGR | NS_BLOCK_MARGIN_ROOT);
}
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindXULDescriptionData(Element* aElement,
nsStyleContext* /* unused */)
{
if (aElement->HasAttr(kNameSpaceID_None, nsGkAtoms::value)) {
return &sXULTextBoxData;
}
static const FrameConstructionData sDescriptionData =
SIMPLE_XUL_FCDATA(NS_NewXULDescriptionFrame);
return &sDescriptionData;
}
#ifdef XP_MACOSX
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindXULMenubarData(Element* aElement,
nsStyleContext* aStyleContext)
{
nsCOMPtr<nsISupports> container =
aStyleContext->PresContext()->GetContainer();
if (container) {
nsCOMPtr<nsIDocShellTreeItem> treeItem(do_QueryInterface(container));
if (treeItem) {
int32_t type;
treeItem->GetItemType(&type);
if (nsIDocShellTreeItem::typeChrome == type) {
nsCOMPtr<nsIDocShellTreeItem> parent;
treeItem->GetParent(getter_AddRefs(parent));
if (!parent) {
// This is the root. Suppress the menubar, since on Mac
// window menus are not attached to the window.
static const FrameConstructionData sSuppressData = SUPPRESS_FCDATA();
return &sSuppressData;
}
}
}
}
static const FrameConstructionData sMenubarData =
SIMPLE_XUL_FCDATA(NS_NewMenuBarFrame);
return &sMenubarData;
}
#endif /* XP_MACOSX */
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindXULListBoxBodyData(Element* aElement,
nsStyleContext* aStyleContext)
{
if (aStyleContext->StyleDisplay()->mDisplay !=
NS_STYLE_DISPLAY_GRID_GROUP) {
return nullptr;
}
static const FrameConstructionData sListBoxBodyData =
SCROLLABLE_XUL_FCDATA(NS_NewListBoxBodyFrame);
return &sListBoxBodyData;
}
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindXULListItemData(Element* aElement,
nsStyleContext* aStyleContext)
{
if (aStyleContext->StyleDisplay()->mDisplay !=
NS_STYLE_DISPLAY_GRID_LINE) {
return nullptr;
}
static const FrameConstructionData sListItemData =
SCROLLABLE_XUL_FCDATA(NS_NewListItemFrame);
return &sListItemData;
}
#endif /* MOZ_XUL */
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindXULDisplayData(const nsStyleDisplay* aDisplay,
Element* aElement,
nsStyleContext* aStyleContext)
{
static const FrameConstructionDataByInt sXULDisplayData[] = {
SCROLLABLE_ABSPOS_CONTAINER_XUL_INT_CREATE(NS_STYLE_DISPLAY_INLINE_BOX,
NS_NewBoxFrame),
SCROLLABLE_ABSPOS_CONTAINER_XUL_INT_CREATE(NS_STYLE_DISPLAY_BOX,
NS_NewBoxFrame),
#ifdef MOZ_XUL
SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_INLINE_GRID, NS_NewGridBoxFrame),
SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_GRID, NS_NewGridBoxFrame),
SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_GRID_GROUP,
NS_NewGridRowGroupFrame),
SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_GRID_LINE,
NS_NewGridRowLeafFrame),
SIMPLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_DECK, NS_NewDeckFrame),
SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_GROUPBOX, NS_NewGroupBoxFrame),
SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_INLINE_STACK, NS_NewStackFrame),
SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_STACK, NS_NewStackFrame),
{ NS_STYLE_DISPLAY_POPUP,
FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_IS_POPUP |
FCDATA_SKIP_ABSPOS_PUSH, NS_NewMenuPopupFrame) }
#endif /* MOZ_XUL */
};
// Processing by display here:
return FindDataByInt(aDisplay->mDisplay, aElement, aStyleContext,
sXULDisplayData, ArrayLength(sXULDisplayData));
}
already_AddRefed<nsStyleContext>
nsCSSFrameConstructor::BeginBuildingScrollFrame(nsFrameConstructorState& aState,
nsIContent* aContent,
nsStyleContext* aContentStyle,
nsIFrame* aParentFrame,
nsIAtom* aScrolledPseudo,
bool aIsRoot,
nsIFrame*& aNewFrame)
{
nsIFrame* gfxScrollFrame = aNewFrame;
nsFrameItems anonymousItems;
nsRefPtr<nsStyleContext> contentStyle = aContentStyle;
if (!gfxScrollFrame) {
// Build a XULScrollFrame when the child is a box, otherwise an
// HTMLScrollFrame
// XXXbz this is the lone remaining consumer of IsXULDisplayType.
// I wonder whether we can eliminate that somehow.
const nsStyleDisplay* displayStyle = aContentStyle->StyleDisplay();
if (IsXULDisplayType(displayStyle)) {
gfxScrollFrame = NS_NewXULScrollFrame(mPresShell, contentStyle, aIsRoot,
displayStyle->mDisplay == NS_STYLE_DISPLAY_STACK ||
displayStyle->mDisplay == NS_STYLE_DISPLAY_INLINE_STACK);
} else {
gfxScrollFrame = NS_NewHTMLScrollFrame(mPresShell, contentStyle, aIsRoot);
}
InitAndRestoreFrame(aState, aContent, aParentFrame, gfxScrollFrame);
}
// if there are any anonymous children for the scroll frame, create
// frames for them.
// Pass a null pending binding: we don't care how constructors for any of
// this anonymous content order with anything else. It's never been
// consistent anyway.
CreateAnonymousFrames(aState, aContent, gfxScrollFrame, nullptr,
anonymousItems);
aNewFrame = gfxScrollFrame;
// we used the style that was passed in. So resolve another one.
nsStyleSet *styleSet = mPresShell->StyleSet();
nsRefPtr<nsStyleContext> scrolledChildStyle =
styleSet->ResolveAnonymousBoxStyle(aScrolledPseudo, contentStyle);
if (gfxScrollFrame) {
gfxScrollFrame->SetInitialChildList(kPrincipalList, anonymousItems);
}
return scrolledChildStyle.forget();
}
void
nsCSSFrameConstructor::FinishBuildingScrollFrame(nsIFrame* aScrollFrame,
nsIFrame* aScrolledFrame)
{
nsFrameList scrolled(aScrolledFrame, aScrolledFrame);
aScrollFrame->AppendFrames(kPrincipalList, scrolled);
}
/**
* Called to wrap a gfx scrollframe around a frame. The hierarchy will look like this
*
* ------- for gfx scrollbars ------
*
*
* ScrollFrame
* ^
* |
* Frame (scrolled frame you passed in)
*
*
*-----------------------------------
* LEGEND:
*
* ScrollFrame: This is a frame that manages gfx cross platform frame based scrollbars.
*
* @param aContent the content node of the child to wrap.
* @param aScrolledFrame The frame of the content to wrap. This should not be
* Initialized. This method will initialize it with a scrolled pseudo
* and no nsIContent. The content will be attached to the scrollframe
* returned.
* @param aContentStyle the style context that has already been resolved for the content being passed in.
*
* @param aParentFrame The parent to attach the scroll frame to
*
* @param aNewFrame The new scrollframe or gfx scrollframe that we create. It will contain the
* scrolled frame you passed in. (returned)
* If this is not null, we'll just use it
* @param aScrolledContentStyle the style that was resolved for the scrolled frame. (returned)
*/
nsresult
nsCSSFrameConstructor::BuildScrollFrame(nsFrameConstructorState& aState,
nsIContent* aContent,
nsStyleContext* aContentStyle,
nsIFrame* aScrolledFrame,
nsIFrame* aParentFrame,
nsIFrame*& aNewFrame)
{
nsRefPtr<nsStyleContext> scrolledContentStyle =
BeginBuildingScrollFrame(aState, aContent, aContentStyle, aParentFrame,
nsCSSAnonBoxes::scrolledContent,
false, aNewFrame);
aScrolledFrame->SetStyleContextWithoutNotification(scrolledContentStyle);
InitAndRestoreFrame(aState, aContent, aNewFrame, aScrolledFrame);
FinishBuildingScrollFrame(aNewFrame, aScrolledFrame);
return NS_OK;
}
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindDisplayData(const nsStyleDisplay* aDisplay,
Element* aElement,
nsIFrame* aParentFrame,
nsStyleContext* aStyleContext)
{
PR_STATIC_ASSERT(eParentTypeCount < (1 << (32 - FCDATA_PARENT_TYPE_OFFSET)));
// The style system ensures that floated and positioned frames are
// block-level.
NS_ASSERTION(!(aDisplay->IsFloatingStyle() ||
aDisplay->IsAbsolutelyPositionedStyle()) ||
aDisplay->IsBlockOutsideStyle(),
"Style system did not apply CSS2.1 section 9.7 fixups");
// If this is "body", try propagating its scroll style to the viewport
// Note that we need to do this even if the body is NOT scrollable;
// it might have dynamically changed from scrollable to not scrollable,
// and that might need to be propagated.
// XXXbz is this the right place to do this? If this code moves,
// make this function static.
bool propagatedScrollToViewport = false;
if (aElement->IsHTML(nsGkAtoms::body)) {
propagatedScrollToViewport =
PropagateScrollToViewport() == aElement;
}
NS_ASSERTION(!propagatedScrollToViewport ||
!mPresShell->GetPresContext()->IsPaginated(),
"Shouldn't propagate scroll in paginated contexts");
// If the frame is a block-level frame and is scrollable, then wrap it in a
// scroll frame.
// XXX Ignore tables for the time being
// XXXbz it would be nice to combine this with the other block
// case... Think about how do do this?
if (aDisplay->IsBlockInsideStyle() &&
aDisplay->IsScrollableOverflow() &&
!propagatedScrollToViewport) {
// Except we don't want to do that for paginated contexts for
// frames that are block-outside and aren't frames for native
// anonymous stuff.
if (mPresShell->GetPresContext()->IsPaginated() &&
aDisplay->IsBlockOutsideStyle() &&
!aElement->IsInNativeAnonymousSubtree()) {
static const FrameConstructionData sForcedNonScrollableBlockData =
FULL_CTOR_FCDATA(FCDATA_FORCED_NON_SCROLLABLE_BLOCK,
&nsCSSFrameConstructor::ConstructNonScrollableBlock);
return &sForcedNonScrollableBlockData;
}
static const FrameConstructionData sScrollableBlockData =
FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructScrollableBlock);
return &sScrollableBlockData;
}
// Handle various non-scrollable blocks
if (aDisplay->IsBlockInsideStyle()) {
static const FrameConstructionData sNonScrollableBlockData =
FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructNonScrollableBlock);
return &sNonScrollableBlockData;
}
static const FrameConstructionDataByInt sDisplayData[] = {
// To keep the hash table small don't add inline frames (they're
// typically things like FONT and B), because we can quickly
// find them if we need to.
// XXXbz the "quickly" part is a bald-faced lie!
{ NS_STYLE_DISPLAY_INLINE,
FULL_CTOR_FCDATA(FCDATA_IS_INLINE | FCDATA_IS_LINE_PARTICIPANT,
&nsCSSFrameConstructor::ConstructInline) },
{ NS_STYLE_DISPLAY_FLEX,
FCDATA_DECL(FCDATA_MAY_NEED_SCROLLFRAME, NS_NewFlexContainerFrame) },
{ NS_STYLE_DISPLAY_INLINE_FLEX,
FCDATA_DECL(FCDATA_MAY_NEED_SCROLLFRAME, NS_NewFlexContainerFrame) },
{ NS_STYLE_DISPLAY_TABLE,
FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructTable) },
{ NS_STYLE_DISPLAY_INLINE_TABLE,
FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructTable) },
// NOTE: In the unlikely event that we add another table-part here that has
// a desired-parent-type (& hence triggers table fixup), we'll need to also
// update the flexbox chunk in nsStyleContext::ApplyStyleFixups().
{ NS_STYLE_DISPLAY_TABLE_CAPTION,
FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_ALLOW_BLOCK_STYLES |
FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH |
FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable),
NS_NewTableCaptionFrame) },
{ NS_STYLE_DISPLAY_TABLE_ROW_GROUP,
FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_DISALLOW_OUT_OF_FLOW |
FCDATA_SKIP_ABSPOS_PUSH |
FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable),
NS_NewTableRowGroupFrame) },
{ NS_STYLE_DISPLAY_TABLE_HEADER_GROUP,
FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_DISALLOW_OUT_OF_FLOW |
FCDATA_SKIP_ABSPOS_PUSH |
FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable),
NS_NewTableRowGroupFrame) },
{ NS_STYLE_DISPLAY_TABLE_FOOTER_GROUP,
FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_DISALLOW_OUT_OF_FLOW |
FCDATA_SKIP_ABSPOS_PUSH |
FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable),
NS_NewTableRowGroupFrame) },
{ NS_STYLE_DISPLAY_TABLE_COLUMN_GROUP,
FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_DISALLOW_OUT_OF_FLOW |
FCDATA_SKIP_ABSPOS_PUSH |
FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable),
NS_NewTableColGroupFrame) },
{ NS_STYLE_DISPLAY_TABLE_COLUMN,
FULL_CTOR_FCDATA(FCDATA_IS_TABLE_PART |
FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeColGroup),
&nsCSSFrameConstructor::ConstructTableCol) },
{ NS_STYLE_DISPLAY_TABLE_ROW,
FULL_CTOR_FCDATA(FCDATA_IS_TABLE_PART |
FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRowGroup),
&nsCSSFrameConstructor::ConstructTableRow) },
{ NS_STYLE_DISPLAY_TABLE_CELL,
FULL_CTOR_FCDATA(FCDATA_IS_TABLE_PART |
FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRow),
&nsCSSFrameConstructor::ConstructTableCell) }
};
return FindDataByInt(aDisplay->mDisplay,
aElement, aStyleContext, sDisplayData,
ArrayLength(sDisplayData));
}
nsIFrame*
nsCSSFrameConstructor::ConstructScrollableBlock(nsFrameConstructorState& aState,
FrameConstructionItem& aItem,
nsIFrame* aParentFrame,
const nsStyleDisplay* aDisplay,
nsFrameItems& aFrameItems)
{
nsIContent* const content = aItem.mContent;
nsStyleContext* const styleContext = aItem.mStyleContext;
nsIFrame* newFrame = nullptr;
nsRefPtr<nsStyleContext> scrolledContentStyle
= BeginBuildingScrollFrame(aState, content, styleContext,
aState.GetGeometricParent(aDisplay, aParentFrame),
nsCSSAnonBoxes::scrolledContent,
false, newFrame);
// Create our block frame
// pass a temporary stylecontext, the correct one will be set later
nsIFrame* scrolledFrame =
NS_NewBlockFormattingContext(mPresShell, styleContext);
// Make sure to AddChild before we call ConstructBlock so that we
// end up before our descendants in fixed-pos lists as needed.
aState.AddChild(newFrame, aFrameItems, content, styleContext, aParentFrame);
nsFrameItems blockItem;
ConstructBlock(aState, scrolledContentStyle->StyleDisplay(), content,
newFrame, newFrame, scrolledContentStyle,
&scrolledFrame, blockItem,
aDisplay->IsPositioned(newFrame) ? newFrame : nullptr,
aItem.mPendingBinding);
NS_ASSERTION(blockItem.FirstChild() == scrolledFrame,
"Scrollframe's frameItems should be exactly the scrolled frame");
FinishBuildingScrollFrame(newFrame, scrolledFrame);
return newFrame;
}
nsIFrame*
nsCSSFrameConstructor::ConstructNonScrollableBlock(nsFrameConstructorState& aState,
FrameConstructionItem& aItem,
nsIFrame* aParentFrame,
const nsStyleDisplay* aDisplay,
nsFrameItems& aFrameItems)
{
nsStyleContext* const styleContext = aItem.mStyleContext;
// We want a block formatting context root in paginated contexts for
// every block that would be scrollable in a non-paginated context.
// We mark our blocks with a bit here if this condition is true, so
// we can check it later in nsFrame::ApplyPaginatedOverflowClipping.
bool clipPaginatedOverflow =
(aItem.mFCData->mBits & FCDATA_FORCED_NON_SCROLLABLE_BLOCK) != 0;
nsIFrame* newFrame;
if ((aDisplay->IsAbsolutelyPositionedStyle() ||
aDisplay->IsFloatingStyle() ||
NS_STYLE_DISPLAY_INLINE_BLOCK == aDisplay->mDisplay ||
clipPaginatedOverflow) &&
!aParentFrame->IsSVGText()) {
newFrame = NS_NewBlockFormattingContext(mPresShell, styleContext);
if (clipPaginatedOverflow) {
newFrame->AddStateBits(NS_BLOCK_CLIP_PAGINATED_OVERFLOW);
}
} else {
newFrame = NS_NewBlockFrame(mPresShell, styleContext);
}
ConstructBlock(aState, aDisplay, aItem.mContent,
aState.GetGeometricParent(aDisplay, aParentFrame),
aParentFrame, styleContext, &newFrame,
aFrameItems,
aDisplay->IsPositioned(newFrame) ? newFrame : nullptr,
aItem.mPendingBinding);
return newFrame;
}
void
nsCSSFrameConstructor::InitAndRestoreFrame(const nsFrameConstructorState& aState,
nsIContent* aContent,
nsIFrame* aParentFrame,
nsIFrame* aNewFrame,
bool aAllowCounters)
{
NS_PRECONDITION(mUpdateCount != 0,
"Should be in an update while creating frames");
MOZ_ASSERT(aNewFrame, "Null frame cannot be initialized");
// Initialize the frame
aNewFrame->Init(aContent, aParentFrame, nullptr);
aNewFrame->AddStateBits(aState.mAdditionalStateBits);
if (aState.mFrameState) {
// Restore frame state for just the newly created frame.
RestoreFrameStateFor(aNewFrame, aState.mFrameState);
}
if (aAllowCounters &&
mCounterManager.AddCounterResetsAndIncrements(aNewFrame)) {
CountersDirty();
}
}
already_AddRefed<nsStyleContext>
nsCSSFrameConstructor::ResolveStyleContext(nsIFrame* aParentFrame,
nsIContent* aContent,
nsFrameConstructorState* aState)
{
nsStyleContext* parentStyleContext = nullptr;
NS_ASSERTION(aContent->GetParent(), "Must have parent here");
aParentFrame = nsFrame::CorrectStyleParentFrame(aParentFrame, nullptr);
if (aParentFrame) {
// Resolve the style context based on the content object and the parent
// style context
parentStyleContext = aParentFrame->StyleContext();
} else {
// Perhaps aParentFrame is a canvasFrame and we're replicating
// fixed-pos frames.
// XXX should we create a way to tell ConstructFrame which style
// context to use, and pass it the style context for the
// previous page's fixed-pos frame?
}
return ResolveStyleContext(parentStyleContext, aContent, aState);
}
already_AddRefed<nsStyleContext>
nsCSSFrameConstructor::ResolveStyleContext(nsStyleContext* aParentStyleContext,
nsIContent* aContent,
nsFrameConstructorState* aState)
{
nsStyleSet *styleSet = mPresShell->StyleSet();
aContent->OwnerDoc()->FlushPendingLinkUpdates();
if (aContent->IsElement()) {
if (aState) {
return styleSet->ResolveStyleFor(aContent->AsElement(),
aParentStyleContext,
aState->mTreeMatchContext);
}
return styleSet->ResolveStyleFor(aContent->AsElement(), aParentStyleContext);
}
NS_ASSERTION(aContent->IsNodeOfType(nsINode::eTEXT),
"shouldn't waste time creating style contexts for "
"comments and processing instructions");
return styleSet->ResolveStyleForNonElement(aParentStyleContext);
}
// MathML Mod - RBS
void
nsCSSFrameConstructor::FlushAccumulatedBlock(nsFrameConstructorState& aState,
nsIContent* aContent,
nsIFrame* aParentFrame,
nsFrameItems& aBlockItems,
nsFrameItems& aNewItems)
{
if (aBlockItems.IsEmpty()) {
// Nothing to do
return;
}
nsIAtom* anonPseudo = nsCSSAnonBoxes::mozMathMLAnonymousBlock;
nsStyleContext* parentContext =
nsFrame::CorrectStyleParentFrame(aParentFrame,
anonPseudo)->StyleContext();
nsStyleSet* styleSet = mPresShell->StyleSet();
nsRefPtr<nsStyleContext> blockContext;
blockContext = styleSet->
ResolveAnonymousBoxStyle(anonPseudo, parentContext);
// then, create a block frame that will wrap the child frames. Make it a
// MathML frame so that Get(Absolute/Float)ContainingBlockFor know that this
// is not a suitable block.
nsIFrame* blockFrame =
NS_NewMathMLmathBlockFrame(mPresShell, blockContext,
NS_BLOCK_FLOAT_MGR | NS_BLOCK_MARGIN_ROOT);
InitAndRestoreFrame(aState, aContent, aParentFrame, blockFrame);
ReparentFrames(this, blockFrame, aBlockItems);
// abs-pos and floats are disabled in MathML children so we don't have to
// worry about messing up those.
blockFrame->SetInitialChildList(kPrincipalList, aBlockItems);
NS_ASSERTION(aBlockItems.IsEmpty(), "What happened?");
aBlockItems.Clear();
aNewItems.AddChild(blockFrame);
}
// Only <math> elements can be floated or positioned. All other MathML
// should be in-flow.
#define SIMPLE_MATHML_CREATE(_tag, _func) \
{ &nsGkAtoms::_tag, \
FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | \
FCDATA_FORCE_NULL_ABSPOS_CONTAINER | \
FCDATA_WRAP_KIDS_IN_BLOCKS, _func) }
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindMathMLData(Element* aElement,
nsIAtom* aTag,
int32_t aNameSpaceID,
nsStyleContext* aStyleContext)
{
// Make sure that we remain confined in the MathML world
if (aNameSpaceID != kNameSpaceID_MathML)
return nullptr;
// Handle <math> specially, because it sometimes produces inlines
if (aTag == nsGkAtoms::math) {
// This needs to match the test in EnsureBlockDisplay in
// nsRuleNode.cpp. Though the behavior here for the display:table
// case is pretty weird...
if (aStyleContext->StyleDisplay()->IsBlockOutsideStyle()) {
static const FrameConstructionData sBlockMathData =
FCDATA_DECL(FCDATA_FORCE_NULL_ABSPOS_CONTAINER |
FCDATA_WRAP_KIDS_IN_BLOCKS,
NS_CreateNewMathMLmathBlockFrame);
return &sBlockMathData;
}
static const FrameConstructionData sInlineMathData =
FCDATA_DECL(FCDATA_FORCE_NULL_ABSPOS_CONTAINER |
FCDATA_IS_LINE_PARTICIPANT |
FCDATA_WRAP_KIDS_IN_BLOCKS,
NS_NewMathMLmathInlineFrame);
return &sInlineMathData;
}
static const FrameConstructionDataByTag sMathMLData[] = {
SIMPLE_MATHML_CREATE(annotation_, NS_NewMathMLTokenFrame),
SIMPLE_MATHML_CREATE(annotation_xml_, NS_NewMathMLmrowFrame),
SIMPLE_MATHML_CREATE(mi_, NS_NewMathMLTokenFrame),
SIMPLE_MATHML_CREATE(mn_, NS_NewMathMLTokenFrame),
SIMPLE_MATHML_CREATE(ms_, NS_NewMathMLTokenFrame),
SIMPLE_MATHML_CREATE(mtext_, NS_NewMathMLTokenFrame),
SIMPLE_MATHML_CREATE(mo_, NS_NewMathMLmoFrame),
SIMPLE_MATHML_CREATE(mfrac_, NS_NewMathMLmfracFrame),
SIMPLE_MATHML_CREATE(msup_, NS_NewMathMLmmultiscriptsFrame),
SIMPLE_MATHML_CREATE(msub_, NS_NewMathMLmmultiscriptsFrame),
SIMPLE_MATHML_CREATE(msubsup_, NS_NewMathMLmmultiscriptsFrame),
SIMPLE_MATHML_CREATE(munder_, NS_NewMathMLmunderoverFrame),
SIMPLE_MATHML_CREATE(mover_, NS_NewMathMLmunderoverFrame),
SIMPLE_MATHML_CREATE(munderover_, NS_NewMathMLmunderoverFrame),
SIMPLE_MATHML_CREATE(mphantom_, NS_NewMathMLmphantomFrame),
SIMPLE_MATHML_CREATE(mpadded_, NS_NewMathMLmpaddedFrame),
SIMPLE_MATHML_CREATE(mspace_, NS_NewMathMLmspaceFrame),
SIMPLE_MATHML_CREATE(none, NS_NewMathMLmspaceFrame),
SIMPLE_MATHML_CREATE(mprescripts_, NS_NewMathMLmspaceFrame),
SIMPLE_MATHML_CREATE(mfenced_, NS_NewMathMLmfencedFrame),
SIMPLE_MATHML_CREATE(mmultiscripts_, NS_NewMathMLmmultiscriptsFrame),
SIMPLE_MATHML_CREATE(mstyle_, NS_NewMathMLmstyleFrame),
SIMPLE_MATHML_CREATE(msqrt_, NS_NewMathMLmsqrtFrame),
SIMPLE_MATHML_CREATE(mroot_, NS_NewMathMLmrootFrame),
SIMPLE_MATHML_CREATE(maction_, NS_NewMathMLmactionFrame),
SIMPLE_MATHML_CREATE(mrow_, NS_NewMathMLmrowFrame),
SIMPLE_MATHML_CREATE(merror_, NS_NewMathMLmrowFrame),
SIMPLE_MATHML_CREATE(menclose_, NS_NewMathMLmencloseFrame),
SIMPLE_MATHML_CREATE(semantics_, NS_NewMathMLsemanticsFrame)
};
return FindDataByTag(aTag, aElement, aStyleContext, sMathMLData,
ArrayLength(sMathMLData));
}
nsIFrame*
nsCSSFrameConstructor::ConstructFrameWithAnonymousChild(
nsFrameConstructorState& aState,
FrameConstructionItem& aItem,
nsIFrame* aParentFrame,
const nsStyleDisplay* aDisplay,
nsFrameItems& aFrameItems,
FrameCreationFunc aConstructor,
FrameCreationFunc aInnerConstructor,
nsICSSAnonBoxPseudo* aInnerPseudo,
bool aCandidateRootFrame)
{
nsIContent* const content = aItem.mContent;
nsStyleContext* const styleContext = aItem.mStyleContext;
// Create the outer frame:
nsIFrame* newFrame = aConstructor(mPresShell, styleContext);
InitAndRestoreFrame(aState, content,
aCandidateRootFrame ?
aState.GetGeometricParent(styleContext->StyleDisplay(),
aParentFrame) :
aParentFrame,
newFrame);
// Create the pseudo SC for the anonymous wrapper child as a child of the SC:
nsRefPtr<nsStyleContext> scForAnon;
scForAnon = mPresShell->StyleSet()->
ResolveAnonymousBoxStyle(aInnerPseudo, styleContext);
// Create the anonymous inner wrapper frame
nsIFrame* innerFrame = aInnerConstructor(mPresShell, scForAnon);
InitAndRestoreFrame(aState, content, newFrame, innerFrame);
// Put the newly created frames into the right child list
SetInitialSingleChild(newFrame, innerFrame);
aState.AddChild(newFrame, aFrameItems, content, styleContext, aParentFrame,
aCandidateRootFrame, aCandidateRootFrame);
if (!mRootElementFrame && aCandidateRootFrame) {
// The frame we're constructing will be the root element frame.
// Set mRootElementFrame before processing children.
mRootElementFrame = newFrame;
}
nsFrameItems childItems;
// Process children
NS_ASSERTION(aItem.mAnonChildren.IsEmpty(),
"nsIAnonymousContentCreator::CreateAnonymousContent should not "
"be implemented for frames for which we explicitly create an "
"anonymous child to wrap its child frames");
if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) {
ConstructFramesFromItemList(aState, aItem.mChildItems,
innerFrame, childItems);
} else {
ProcessChildren(aState, content, styleContext, innerFrame,
true, childItems, false, aItem.mPendingBinding);
}
// Set the inner wrapper frame's initial primary list
innerFrame->SetInitialChildList(kPrincipalList, childItems);
return newFrame;
}
nsIFrame*
nsCSSFrameConstructor::ConstructOuterSVG(nsFrameConstructorState& aState,
FrameConstructionItem& aItem,
nsIFrame* aParentFrame,
const nsStyleDisplay* aDisplay,
nsFrameItems& aFrameItems)
{
return ConstructFrameWithAnonymousChild(
aState, aItem, aParentFrame, aDisplay, aFrameItems,
NS_NewSVGOuterSVGFrame, NS_NewSVGOuterSVGAnonChildFrame,
nsCSSAnonBoxes::mozSVGOuterSVGAnonChild, true);
}
nsIFrame*
nsCSSFrameConstructor::ConstructMarker(nsFrameConstructorState& aState,
FrameConstructionItem& aItem,
nsIFrame* aParentFrame,
const nsStyleDisplay* aDisplay,
nsFrameItems& aFrameItems)
{
return ConstructFrameWithAnonymousChild(
aState, aItem, aParentFrame, aDisplay, aFrameItems,
NS_NewSVGMarkerFrame, NS_NewSVGMarkerAnonChildFrame,
nsCSSAnonBoxes::mozSVGMarkerAnonChild, false);
}
// Only outer <svg> elements can be floated or positioned. All other SVG
// should be in-flow.
#define SIMPLE_SVG_FCDATA(_func) \
FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | \
FCDATA_SKIP_ABSPOS_PUSH | \
FCDATA_DISALLOW_GENERATED_CONTENT, _func)
#define SIMPLE_SVG_CREATE(_tag, _func) \
{ &nsGkAtoms::_tag, SIMPLE_SVG_FCDATA(_func) }
static bool
IsFilterPrimitiveChildTag(const nsIAtom* aTag)
{
return aTag == nsGkAtoms::feDistantLight ||
aTag == nsGkAtoms::fePointLight ||
aTag == nsGkAtoms::feSpotLight ||
aTag == nsGkAtoms::feFuncR ||
aTag == nsGkAtoms::feFuncG ||
aTag == nsGkAtoms::feFuncB ||
aTag == nsGkAtoms::feFuncA ||
aTag == nsGkAtoms::feMergeNode;
}
/* static */
const nsCSSFrameConstructor::FrameConstructionData*
nsCSSFrameConstructor::FindSVGData(Element* aElement,
nsIAtom* aTag,
int32_t aNameSpaceID,
nsIFrame* aParentFrame,
bool aIsWithinSVGText,
bool aAllowsTextPathChild,
nsStyleContext* aStyleContext)
{
if (aNameSpaceID != kNameSpaceID_SVG) {
return nullptr;
}
static const FrameConstructionData sSuppressData = SUPPRESS_FCDATA();
static const FrameConstructionData sContainerData =
SIMPLE_SVG_FCDATA(NS_NewSVGContainerFrame);
bool parentIsSVG = aIsWithinSVGText;
nsIContent* parentContent =
aParentFrame ? aParentFrame->GetContent() : nullptr;
// XXXbz should this really be based on the XBL-resolved tag of the parent
// frame's content? Should it not be based on the type of the parent frame
// (e.g. whether it's an SVG frame)?
if (parentContent) {
int32_t parentNSID;
nsIAtom* parentTag =
parentContent->OwnerDoc()->BindingManager()->
ResolveTag(parentContent, &parentNSID);
// It's not clear whether the SVG spec intends to allow any SVG
// content within svg:foreignObject at all (SVG 1.1, section
// 23.2), but if it does, it better be svg:svg. So given that
// we're allowing it, treat it as a non-SVG parent.
parentIsSVG = parentNSID == kNameSpaceID_SVG &&
parentTag != nsGkAtoms::foreignObject;
}
if ((aTag != nsGkAtoms::svg && !parentIsSVG) ||
(aTag == nsGkAtoms::desc || aTag == nsGkAtoms::title)) {
// Sections 5.1 and G.4 of SVG 1.1 say that SVG elements other than
// svg:svg not contained within svg:svg are incorrect, although they
// don't seem to specify error handling. Ignore them, since many of
// our frame classes can't deal. It *may* be that the document
// should at that point be considered in error according to F.2, but
// it's hard to tell.
//
// Style mutation can't change this situation, so don't bother
// adding to the undisplayed content map.
//
// We don't currently handle any UI for desc/title
return &sSuppressData;
}
// We don't need frames for animation elements
if (aElement->IsNodeOfType(nsINode::eANIMATION)) {
return &sSuppressData;
}
if (aTag == nsGkAtoms::svg && !parentIsSVG) {
// We need outer <svg> elements to have an nsSVGOuterSVGFrame regardless
// of whether they fail conditional processing attributes, since various
// SVG frames assume that one exists. We handle the non-rendering
// of failing outer <svg> element contents like <switch> statements,
// and do the PassesConditionalProcessingTests call in
// nsSVGOuterSVGFrame::Init.
static const FrameConstructionData sOuterSVGData =
FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructOuterSVG);
return &sOuterSVGData;
}
if (aTag == nsGkAtoms::marker) {
static const FrameConstructionData sMarkerSVGData =
FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructMarker);
return &sMarkerSVGData;
}
nsCOMPtr<SVGTests> tests(do_QueryInterface(aElement));
if (tests && !tests->PassesConditionalProcessingTests()) {
// Elements with failing conditional processing attributes never get
// rendered. Note that this is not where we select which frame in a
// <switch> to render! That happens in nsSVGSwitchFrame::PaintSVG.
return &sContainerData;
}
// Prevent bad frame types being children of filters or parents of filter
// primitives. If aParentFrame is null, we know that the frame that will
// be created will be an nsInlineFrame, so it can never be a filter.
bool parentIsFilter = aParentFrame &&
aParentFrame->GetType() == nsGkAtoms::svgFilterFrame;
bool filterPrimitive = aElement->IsNodeOfType(nsINode::eFILTER);
if ((parentIsFilter && !filterPrimitive) ||
(!parentIsFilter && filterPrimitive)) {
return &sSuppressData;
}
// Prevent bad frame types being children of filter primitives or parents of
// filter primitive children. If aParentFrame is null, we know that the frame
// that will be created will be an nsInlineFrame, so it can never be a filter
// primitive.
bool parentIsFEContainerFrame = aParentFrame &&
aParentFrame->GetType() == nsGkAtoms::svgFEContainerFrame;
if ((parentIsFEContainerFrame && !IsFilterPrimitiveChildTag(aTag)) ||
(!parentIsFEContainerFrame && IsFilterPrimitiveChildTag(aTag))) {
return &sSuppressData;
}
// Special cases for text/tspan/textPath, because the kind of frame
// they get depends on the parent frame. We ignore 'a' elements when
// determining the parent, however.
if (aIsWithinSVGText) {
// If aIsWithinSVGText is true, then we know that the "SVG text uses
// CSS frames" pref was true when this SVG fragment was first constructed.
// We don't use ConstructInline because we want different behavior
// for generated content.
static const FrameConstructionData sTSpanData =
FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW |
FCDATA_SKIP_ABSPOS_PUSH |
FCDATA_DISALLOW_GENERATED_CONTENT |
FCDATA_IS_LINE_PARTICIPANT |
FCDATA_IS_INLINE |
FCDATA_USE_CHILD_ITEMS,
NS_NewInlineFrame);
if (aTag == nsGkAtoms::textPath) {
if (aAllowsTextPathChild) {
return &sTSpanData;
}
} else if (aTag == nsGkAtoms::tspan ||
aTag == nsGkAtoms::altGlyph ||
aTag == nsGkAtoms::a) {
return &sTSpanData;
}
return &sSuppressData;
} else if (NS_SVGTextCSSFramesEnabled()) {
if (aTag == nsGkAtoms::text) {
static const FrameConstructionData sTextData =
FCDATA_WITH_WRAPPING_BLOCK(FCDATA_DISALLOW_OUT_OF_FLOW |
FCDATA_ALLOW_BLOCK_STYLES,
NS_NewSVGTextFrame2,
nsCSSAnonBoxes::mozSVGText);
return &sTextData;
} else if (aTag == nsGkAtoms::tspan ||
aTag == nsGkAtoms::altGlyph ||
aTag == nsGkAtoms::textPath) {
return &sSuppressData;
}
} else {
nsIFrame *ancestorFrame =
nsSVGUtils::GetFirstNonAAncestorFrame(aParentFrame);
if (ancestorFrame) {
if (aTag == nsGkAtoms::tspan || aTag == nsGkAtoms::altGlyph) {
// tspan and altGlyph must be children of another text content element.
nsSVGTextContainerFrame* metrics = do_QueryFrame(ancestorFrame);
if (!metrics) {
return &sSuppressData;
}
} else if (aTag == nsGkAtoms::textPath) {
// textPath must be a child of text.
nsIAtom* ancestorFrameType = ancestorFrame->GetType();
if (ancestorFrameType != nsGkAtoms::svgTextFrame) {
return &sSuppressData;
}
} else if (aTag != nsGkAtoms::a) {
// Every other element except 'a' must not be a child of a text content
// element.
nsSVGTextContainerFrame* metrics = do_QueryFrame(ancestorFrame);
if (metrics) {
return &sSuppressData;
}
}
}
}
static const FrameConstructionDataByTag sSVGData[] = {
SIMPLE_SVG_CREATE(svg, NS_NewSVGInnerSVGFrame),
SIMPLE_SVG_CREATE(g, NS_NewSVGGFrame),
SIMPLE_SVG_CREATE(svgSwitch, NS_NewSVGSwitchFrame),
SIMPLE_SVG_CREATE(polygon, NS_NewSVGPathGeometryFrame),
SIMPLE_SVG_CREATE(polyline, NS_NewSVGPathGeometryFrame),
SIMPLE_SVG_CREATE(circle, NS_NewSVGPathGeometryFrame),
SIMPLE_SVG_CREATE(ellipse, NS_NewSVGPathGeometryFrame),
SIMPLE_SVG_CREATE(line, NS_NewSVGPathGeometryFrame),
SIMPLE_SVG_CREATE(rect, NS_NewSVGPathGeometryFrame),
SIMPLE_SVG_CREATE(path, NS_NewSVGPathGeometryFrame),
SIMPLE_SVG_CREATE(defs, NS_NewSVGContainerFrame),
SIMPLE_SVG_CREATE(generic_, NS_NewSVGGenericContainerFrame),
{ &nsGkAtoms::foreignObject,
FCDATA_WITH_WRAPPING_BLOCK(FCDATA_DISALLOW_OUT_OF_FLOW,
NS_NewSVGForeignObjectFrame,
nsCSSAnonBoxes::mozSVGForeignContent) },
SIMPLE_SVG_CREATE(a, NS_NewSVGAFrame),
SIMPLE_SVG_CREATE(altGlyph, NS_NewSVGTSpanFrame),
SIMPLE_SVG_CREATE(text, NS_NewSVGTextFrame),
SIMPLE_SVG_CREATE(tspan, NS_NewSVGTSpanFrame),
SIMPLE_SVG_CREATE(linearGradient, NS_NewSVGLinearGradientFrame),
SIMPLE_SVG_CREATE(radialGradient, NS_NewSVGRadialGradientFrame),
SIMPLE_SVG_CREATE(stop, NS_NewSVGStopFrame),
SIMPLE_SVG_CREATE(use, NS_NewSVGUseFrame),
SIMPLE_SVG_CREATE(view, NS_NewSVGViewFrame),
SIMPLE_SVG_CREATE(image, NS_NewSVGImageFrame),
SIMPLE_SVG_CREATE(clipPath, NS_NewSVGClipPathFrame),
SIMPLE_SVG_CREATE(textPath, NS_NewSVGTextPathFrame),
SIMPLE_SVG_CREATE(filter, NS_NewSVGFilterFrame),
SIMPLE_SVG_CREATE(pattern, NS_NewSVGPatternFrame),
SIMPLE_SVG_CREATE(mask, NS_NewSVGMaskFrame),
SIMPLE_SVG_CREATE(feDistantLight, NS_NewSVGFEUnstyledLeafFrame),
SIMPLE_SVG_CREATE(fePointLight, NS_NewSVGFEUnstyledLeafFrame),
SIMPLE_SVG_CREATE(feSpotLight, NS_NewSVGFEUnstyledLeafFrame),
SIMPLE_SVG_CREATE(feBlend, NS_NewSVGFELeafFrame),
SIMPLE_SVG_CREATE(feColorMatrix, NS_NewSVGFELeafFrame),
SIMPLE_SVG_CREATE(feFuncR, NS_NewSVGFEUnstyledLeafFrame),
SIMPLE_SVG_CREATE(feFuncG, NS_NewSVGFEUnstyledLeafFrame),
SIMPLE_SVG_CREATE(feFuncB, NS_NewSVGFEUnstyledLeafFrame),
SIMPLE_SVG_CREATE(feFuncA, NS_NewSVGFEUnstyledLeafFrame),
SIMPLE_SVG_CREATE(feComposite, NS_NewSVGFELeafFrame),
SIMPLE_SVG_CREATE(feComponentTransfer, NS_NewSVGFEContainerFrame),
SIMPLE_SVG_CREATE(feConvolveMatrix, NS_NewSVGFELeafFrame),
SIMPLE_SVG_CREATE(feDiffuseLighting, NS_NewSVGFEContainerFrame),
SIMPLE_SVG_CREATE(feDisplacementMap, NS_NewSVGFELeafFrame),
SIMPLE_SVG_CREATE(feFlood, NS_NewSVGFELeafFrame),
SIMPLE_SVG_CREATE(feGaussianBlur, NS_NewSVGFELeafFrame),
SIMPLE_SVG_CREATE(feImage, NS_NewSVGFEImageFrame),
SIMPLE_SVG_CREATE(feMerge, NS_NewSVGFEContainerFrame),
SIMPLE_SVG_CREATE(feMergeNode, NS_NewSVGFEUnstyledLeafFrame),
SIMPLE_SVG_CREATE(feMorphology, NS_NewSVGFELeafFrame),
SIMPLE_SVG_CREATE(feOffset, NS_NewSVGFELeafFrame),
SIMPLE_SVG_CREATE(feSpecularLighting, NS_NewSVGFEContainerFrame),
SIMPLE_SVG_CREATE(feTile, NS_NewSVGFELeafFrame),
SIMPLE_SVG_CREATE(feTurbulence, NS_NewSVGFELeafFrame)
};
const FrameConstructionData* data =
FindDataByTag(aTag, aElement, aStyleContext, sSVGData,
ArrayLength(sSVGData));
if (!data) {
data = &sContainerData;
}
return data;
}
void
nsCSSFrameConstructor::AddPageBreakItem(nsIContent* aContent,
nsStyleContext* aMainStyleContext,
FrameConstructionItemList& aItems)
{
nsRefPtr<nsStyleContext> pseudoStyle;
// Use the same parent style context that |aMainStyleContext| has, since
// that's easier to re-resolve and it doesn't matter in practice.
// (Getting different parents can result in framechange hints, e.g.,
// for user-modify.)
pseudoStyle =
mPresShell->StyleSet()->
ResolveAnonymousBoxStyle(nsCSSAnonBoxes::pageBreak,
aMainStyleContext->GetParent());
NS_ASSERTION(pseudoStyle->StyleDisplay()->mDisplay ==
NS_STYLE_DISPLAY_BLOCK, "Unexpected display");
static const FrameConstructionData sPageBreakData =
FCDATA_DECL(FCDATA_SKIP_FRAMESET, NS_NewPageBreakFrame);
// Lie about the tag and namespace so we don't trigger anything
// interesting during frame construction.
aItems.AppendItem(&sPageBreakData, aContent, nsCSSAnonBoxes::pageBreak,
kNameSpaceID_None, nullptr, pseudoStyle.forget(), true,
nullptr);
}
void
nsCSSFrameConstructor::ConstructFrame(nsFrameConstructorState& aState,
nsIContent* aContent,
nsIFrame* aParentFrame,
nsFrameItems& aFrameItems)
{
NS_PRECONDITION(aParentFrame, "no parent frame");
// NOTE: If we start using this code for non-anonymous content, we'll need
// to evaluate whether the AutoFlexItemStyleFixupSkipper (instantiated below)
// is appropriate for that content.
NS_PRECONDITION(aContent->IsRootOfNativeAnonymousSubtree(),
"ConstructFrame should only be used for anonymous content");
FrameConstructionItemList items;
{
// Skip flex item style-fixup during our AddFrameConstructionItems() call:
TreeMatchContext::AutoFlexItemStyleFixupSkipper
flexItemStyleFixupSkipper(aState.mTreeMatchContext);
AddFrameConstructionItems(aState, aContent, true, aParentFrame, items);
}
items.SetTriedConstructingFrames();
for (FCItemIterator iter(items); !iter.IsDone(); iter.Next()) {
NS_ASSERTION(iter.item().DesiredParentType() == GetParentType(aParentFrame),
"This is not going to work");
ConstructFramesFromItem(aState, iter, aParentFrame, aFrameItems);
}
}
void
nsCSSFrameConstructor::AddFrameConstructionItems(nsFrameConstructorState& aState,
nsIContent* aContent,
bool aSuppressWhiteSpaceOptimizations,
nsIFrame* aParentFrame,
FrameConstructionItemList& aItems)
{
aContent->UnsetFlags(NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME);
if (aContent->IsElement()) {
// We can't just remove our pending restyle flags, since we may
// have restyle-later-siblings set on us. But we _can_ remove the
// "is possible restyle root" flags, and need to. Otherwise we can
// end up with stale such flags (e.g. if we used to have a
// display:none parent when our last restyle was posted and
// processed and now no longer do).
aContent->UnsetFlags(ELEMENT_ALL_RESTYLE_FLAGS &
~ELEMENT_PENDING_RESTYLE_FLAGS);
}
// XXX the GetContent() != aContent check is needed due to bug 135040.
// Remove it once that's fixed.
if (aContent->GetPrimaryFrame() &&
aContent->GetPrimaryFrame()->GetContent() == aContent &&
!aState.mCreatingExtraFrames) {
NS_ERROR("asked to create frame construction item for a node that already "
"has a frame");
return;
}
// don't create a whitespace frame if aParent doesn't want it
if (!NeedFrameFor(aState, aParentFrame, aContent)) {
return;
}
// never create frames for comments or PIs
if (aContent->IsNodeOfType(nsINode::eCOMMENT) ||
aContent->IsNodeOfType(nsINode::ePROCESSING_INSTRUCTION))
return;
nsRefPtr<nsStyleContext> styleContext;
styleContext = ResolveStyleContext(aParentFrame, aContent, &aState);
uint32_t flags = ITEM_ALLOW_XBL_BASE | ITEM_ALLOW_PAGE_BREAK;
if (aParentFrame->IsSVGText()) {
flags |= ITEM_IS_WITHIN_SVG_TEXT;
}
if (aParentFrame->GetType() == nsGkAtoms::blockFrame &&
aParentFrame->GetParent() &&
aParentFrame->GetParent()->GetType() == nsGkAtoms::svgTextFrame2) {
flags |= ITEM_ALLOWS_TEXT_PATH_CHILD;
}
AddFrameConstructionItemsInternal(aState, aContent, aParentFrame,
aContent->Tag(), aContent->GetNameSpaceID(),
aSuppressWhiteSpaceOptimizations,
styleContext,
flags, nullptr,
aItems);
}
/* static */ void
nsCSSFrameConstructor::SetAsUndisplayedContent(FrameConstructionItemList& aList,
nsIContent* aContent,
nsStyleContext* aStyleContext,
bool aIsGeneratedContent)
{
if (aStyleContext->GetPseudo()) {
if (aIsGeneratedContent) {
aContent->UnbindFromTree();
}
return;
}
NS_ASSERTION(!aIsGeneratedContent, "Should have had pseudo type");
aList.AppendUndisplayedItem(aContent, aStyleContext);
}
void
nsCSSFrameConstructor::AddFrameConstructionItemsInternal(nsFrameConstructorState& aState,
nsIContent* aContent,
nsIFrame* aParentFrame,
nsIAtom* aTag,
int32_t aNameSpaceID,
bool aSuppressWhiteSpaceOptimizations,
nsStyleContext* aStyleContext,
uint32_t aFlags,
nsTArray<nsIAnonymousContentCreator::ContentInfo>* aAnonChildren,
FrameConstructionItemList& aItems)
{
NS_PRECONDITION(aContent->IsNodeOfType(nsINode::eTEXT) ||
aContent->IsElement(),
"Shouldn't get anything else here!");
// The following code allows the user to specify the base tag
// of an element using XBL. XUL and HTML objects (like boxes, menus, etc.)
// can then be extended arbitrarily.
const nsStyleDisplay* display = aStyleContext->StyleDisplay();
nsRefPtr<nsStyleContext> styleContext(aStyleContext);
PendingBinding* pendingBinding = nullptr;
if ((aFlags & ITEM_ALLOW_XBL_BASE) && display->mBinding)
{
// Ensure that our XBL bindings are installed.
nsXBLService* xblService = nsXBLService::GetInstance();
if (!xblService)
return;
bool resolveStyle;
nsAutoPtr<PendingBinding> newPendingBinding(new PendingBinding());
nsresult rv = xblService->LoadBindings(aContent, display->mBinding->GetURI(),
display->mBinding->mOriginPrincipal,
getter_AddRefs(newPendingBinding->mBinding),
&resolveStyle);
if (NS_FAILED(rv) && rv != NS_ERROR_XBL_BLOCKED)
return;
if (newPendingBinding->mBinding) {
pendingBinding = newPendingBinding;
// aState takes over owning newPendingBinding
aState.AddPendingBinding(newPendingBinding.forget());
}
if (resolveStyle) {
styleContext =
ResolveStyleContext(styleContext->GetParent(), aContent, &aState);
display = styleContext->StyleDisplay();
aStyleContext = styleContext;
}
aTag = mDocument->BindingManager()->ResolveTag(aContent, &aNameSpaceID);
}
bool isGeneratedContent = ((aFlags & ITEM_IS_GENERATED_CONTENT) != 0);
// Pre-check for display "none" - if we find that, don't create
// any frame at all
if (NS_STYLE_DISPLAY_NONE == display->mDisplay) {
SetAsUndisplayedContent(aItems, aContent, styleContext, isGeneratedContent);
return;
}
bool isText = !aContent->IsElement();
// never create frames for non-option/optgroup kids of <select> and
// non-option kids of <optgroup> inside a <select>.
// XXXbz it's not clear how this should best work with XBL.
nsIContent *parent = aContent->GetParent();
if (parent) {
// Check tag first, since that check will usually fail
nsIAtom* parentTag = parent->Tag();
if ((parentTag == nsGkAtoms::select || parentTag == nsGkAtoms::optgroup) &&
parent->IsHTML() &&
// <option> is ok no matter what
!aContent->IsHTML(nsGkAtoms::option) &&
// <optgroup> is OK in <select> but not in <optgroup>
(!aContent->IsHTML(nsGkAtoms::optgroup) ||
parentTag != nsGkAtoms::select) &&
// Allow native anonymous content no matter what
!aContent->IsRootOfNativeAnonymousSubtree()) {
// No frame for aContent
if (!isText) {
SetAsUndisplayedContent(aItems, aContent, styleContext,
isGeneratedContent);
}
return;
}
}
bool isPopup = false;
// Try to find frame construction data for this content
const FrameConstructionData* data;
if (isText) {
data = FindTextData(aParentFrame);
if (!data) {
// Nothing to do here; suppressed text inside SVG
return;
}
} else {
Element* element = aContent->AsElement();
// Don't create frames for non-SVG element children of SVG elements.
if (aNameSpaceID != kNameSpaceID_SVG &&
((aParentFrame &&
IsFrameForSVG(aParentFrame) &&
!aParentFrame->IsFrameOfType(nsIFrame::eSVGForeignObject)) ||
(aFlags & ITEM_IS_WITHIN_SVG_TEXT))) {
SetAsUndisplayedContent(aItems, element, styleContext,
isGeneratedContent);
return;
}
data = FindHTMLData(element, aTag, aNameSpaceID, aParentFrame,
styleContext);
if (!data) {
data = FindXULTagData(element, aTag, aNameSpaceID, styleContext);
}
if (!data) {
data = FindMathMLData(element, aTag, aNameSpaceID, styleContext);
}
if (!data) {
data = FindSVGData(element, aTag, aNameSpaceID, aParentFrame,
aFlags & ITEM_IS_WITHIN_SVG_TEXT,
aFlags & ITEM_ALLOWS_TEXT_PATH_CHILD,
styleContext);
}
// Now check for XUL display types
if (!data) {
data = FindXULDisplayData(display, element, styleContext);
}
// And general display types
if (!data) {
data = FindDisplayData(display, element, aParentFrame, styleContext);
}
NS_ASSERTION(data, "Should have frame construction data now");
if (data->mBits & FCDATA_SUPPRESS_FRAME) {
SetAsUndisplayedContent(aItems, element, styleContext, isGeneratedContent);
return;
}
#ifdef MOZ_XUL
if ((data->mBits & FCDATA_IS_POPUP) &&
(!aParentFrame || // Parent is inline
aParentFrame->GetType() != nsGkAtoms::menuFrame)) {
if (!aState.mPopupItems.containingBlock &&
!aState.mHavePendingPopupgroup) {
SetAsUndisplayedContent(aItems, element, styleContext,
isGeneratedContent);
return;
}
isPopup = true;
}
#endif /* MOZ_XUL */
}
uint32_t bits = data->mBits;
// Inside colgroups, suppress everything except columns.
if (aParentFrame &&
aParentFrame->GetType() == nsGkAtoms::tableColGroupFrame &&
(!(bits & FCDATA_IS_TABLE_PART) ||
display->mDisplay != NS_STYLE_DISPLAY_TABLE_COLUMN)) {
SetAsUndisplayedContent(aItems, aContent, styleContext, isGeneratedContent);
return;
}
bool canHavePageBreak =
(aFlags & ITEM_ALLOW_PAGE_BREAK) &&
aState.mPresContext->IsPaginated() &&
!display->IsAbsolutelyPositionedStyle() &&
!(bits & FCDATA_IS_TABLE_PART) &&
!(bits & FCDATA_IS_SVG_TEXT);
if (canHavePageBreak && display->mBreakBefore) {
AddPageBreakItem(aContent, aStyleContext, aItems);
}
FrameConstructionItem* item =
aItems.AppendItem(data, aContent, aTag, aNameSpaceID,
pendingBinding, styleContext.forget(),
aSuppressWhiteSpaceOptimizations, aAnonChildren);
if (!item) {
if (isGeneratedContent) {
aContent->UnbindFromTree();
}
return;
}
item->mIsText = isText;
item->mIsGeneratedContent = isGeneratedContent;
if (isGeneratedContent) {
NS_ADDREF(item->mContent);
}
item->mIsRootPopupgroup =
aNameSpaceID == kNameSpaceID_XUL && aTag == nsGkAtoms::popupgroup &&
aContent->IsRootOfNativeAnonymousSubtree();
if (item->mIsRootPopupgroup) {
aState.mHavePendingPopupgroup = true;
}
item->mIsPopup = isPopup;
item->mIsForSVGAElement = aNameSpaceID == kNameSpaceID_SVG &&
aTag == nsGkAtoms::a;
if (canHavePageBreak && display->mBreakAfter) {
AddPageBreakItem(aContent, aStyleContext, aItems);
}
if (bits & FCDATA_IS_INLINE) {
// To correctly set item->mIsAllInline we need to build up our child items
// right now.
BuildInlineChildItems(aState, *item,
aFlags & ITEM_IS_WITHIN_SVG_TEXT,
aFlags & ITEM_ALLOWS_TEXT_PATH_CHILD);
item->mHasInlineEnds = true;
item->mIsBlock = false;
} else {
// Compute a boolean isInline which is guaranteed to be false for blocks
// (but may also be false for some inlines).
bool isInline =
// Table-internal things are inline-outside if and only if they're kids of
// inlines, since they'll trigger construction of inline-table
// pseudos.
((bits & FCDATA_IS_TABLE_PART) &&
(!aParentFrame || // No aParentFrame means inline
aParentFrame->StyleDisplay()->mDisplay == NS_STYLE_DISPLAY_INLINE)) ||
// Things that are inline-outside but aren't inline frames are inline
display->IsInlineOutsideStyle() ||
// Popups that are certainly out of flow.
isPopup;
// Set mIsAllInline conservatively. It just might be that even an inline
// that has mIsAllInline false doesn't need an {ib} split. So this is just
// an optimization to keep from doing too much work in cases when we can
// show that mIsAllInline is true..
item->mIsAllInline = item->mHasInlineEnds = isInline ||
// Figure out whether we're guaranteed this item will be out of flow.
// This is not a precise test, since one of our ancestor inlines might add
// an absolute containing block (if it's relatively positioned) when there
// wasn't such a containing block before. But it's conservative in the
// sense that anything that will really end up as an in-flow non-inline
// will test false here. In other words, if this test is true we're
// guaranteed to be inline; if it's false we don't know what we'll end up
// as.
//
// If we make this test precise, we can remove some of the code dealing
// with the imprecision in ConstructInline and adjust the comments on
// mIsAllInline and mIsBlock in the header. And probably remove mIsBlock
// altogether, since then it will always be equal to !mHasInlineEnds.
(!(bits & FCDATA_DISALLOW_OUT_OF_FLOW) &&
aState.GetGeometricParent(display, nullptr));
// Set mIsBlock conservatively. It's OK to set it false for some real
// blocks, but not OK to set it true for things that aren't blocks. Since
// isOutOfFlow might be false even in cases when the frame will end up
// out-of-flow, we can't use it here. But we _can_ say that the frame will
// for sure end up in-flow if it's not floated or absolutely positioned.
item->mIsBlock = !isInline &&
!display->IsAbsolutelyPositionedStyle() &&
!display->IsFloatingStyle() &&
!(bits & FCDATA_IS_SVG_TEXT);
}
if (item->mIsAllInline) {
aItems.InlineItemAdded();
} else if (item->mIsBlock) {
aItems.BlockItemAdded();
}
// Our item should be treated as a line participant if we have the relevant
// bit and are going to be in-flow. Note that this really only matters if
// our ancestor is a box or some such, so the fact that we might have an
// inline ancestor that might become a containing block is not relevant here.
if ((bits & FCDATA_IS_LINE_PARTICIPANT) &&
((bits & FCDATA_DISALLOW_OUT_OF_FLOW) ||
!aState.GetGeometricParent(display, nullptr))) {
item->mIsLineParticipant = true;
aItems.LineParticipantItemAdded();
}
}
static void
DestroyContent(void* aPropertyValue)
{
nsIContent* content = static_cast<nsIContent*>(aPropertyValue);
content->UnbindFromTree();
NS_RELEASE(content);
}
NS_DECLARE_FRAME_PROPERTY(BeforeProperty, DestroyContent)
NS_DECLARE_FRAME_PROPERTY(AfterProperty, DestroyContent)
static const FramePropertyDescriptor*
GenConPseudoToProperty(nsIAtom* aPseudo)
{
NS_ASSERTION(aPseudo == nsCSSPseudoElements::before ||
aPseudo == nsCSSPseudoElements::after,
"Bad gen-con pseudo");
return aPseudo == nsCSSPseudoElements::before ? BeforeProperty()
: AfterProperty();
}
/**
* Return true if the frame construction item pointed to by aIter will
* create a frame adjacent to a line boundary in the frame tree, and that
* line boundary is induced by a content node adjacent to the frame's
* content node in the content tree. The latter condition is necessary so
* that ContentAppended/ContentInserted/ContentRemoved can easily find any
* text nodes that were suppressed here.
*/
bool
nsCSSFrameConstructor::AtLineBoundary(FCItemIterator& aIter)
{
if (aIter.item().mSuppressWhiteSpaceOptimizations) {
return false;
}
if (aIter.AtStart()) {
if (aIter.List()->HasLineBoundaryAtStart() &&
!aIter.item().mContent->GetPreviousSibling())
return true;
} else {
FCItemIterator prev = aIter;
prev.Prev();
if (prev.item().IsLineBoundary() &&
!prev.item().mSuppressWhiteSpaceOptimizations &&
aIter.item().mContent->GetPreviousSibling() == prev.item().mContent)
return true;
}
FCItemIterator next = aIter;
next.Next();
if (next.IsDone()) {
if (aIter.List()->HasLineBoundaryAtEnd() &&
!aIter.item().mContent->GetNextSibling())
return true;
} else {
if (next.item().IsLineBoundary() &&
!next.item().mSuppressWhiteSpaceOptimizations &&
aIter.item().mContent->GetNextSibling() == next.item().mContent)
return true;
}
return false;
}
void
nsCSSFrameConstructor::ConstructFramesFromItem(nsFrameConstructorState& aState,
FCItemIterator& aIter,
nsIFrame* aParentFrame,
nsFrameItems& aFrameItems)
{
nsIFrame* adjParentFrame = aParentFrame;
FrameConstructionItem& item = aIter.item();
nsStyleContext* styleContext = item.mStyleContext;
AdjustParentFrame(adjParentFrame, item.mFCData, styleContext);
if (item.mIsText) {
// If this is collapsible whitespace next to a line boundary,
// don't create a frame. item.IsWhitespace() also sets the
// NS_CREATE_FRAME_IF_NON_WHITESPACE flag in the text node. (If we
// end up creating a frame, nsTextFrame::Init will clear the flag.)
// We don't do this for generated content, because some generated
// text content is empty text nodes that are about to be initialized.
// (We check mAdditionalStateBits because only the generated content
// container's frame construction item is marked with
// mIsGeneratedContent, and we might not have an aParentFrame.)
// We don't do it for content that may have XBL anonymous siblings,
// because they make it difficult to correctly create the frame
// due to dynamic changes.
// We don't do it for SVG text, since we might need to position and
// measure the white space glyphs due to x/y/dx/dy attributes.
// We check that NS_CREATE_FRAME_FOR_IGNORABLE_WHITESPACE is not set on
// the node. This lets us disable this optimization for specific nodes
// (e.g. nodes whose geometry is being queried via DOM APIs).
if (AtLineBoundary(aIter) &&
!styleContext->StyleText()->WhiteSpaceOrNewlineIsSignificant() &&
aIter.List()->ParentHasNoXBLChildren() &&
!(aState.mAdditionalStateBits & NS_FRAME_GENERATED_CONTENT) &&
(item.mFCData->mBits & FCDATA_IS_LINE_PARTICIPANT) &&
!(item.mFCData->mBits & FCDATA_IS_SVG_TEXT) &&
!item.mContent->HasFlag(NS_CREATE_FRAME_FOR_IGNORABLE_WHITESPACE) &&
item.IsWhitespace(aState))
return;
ConstructTextFrame(item.mFCData, aState, item.mContent,
adjParentFrame, styleContext,
aFrameItems);
return;
}
// Start background loads during frame construction so that we're
// guaranteed that they will be started before onload fires.
styleContext->StartBackgroundImageLoads();
nsFrameState savedStateBits = aState.mAdditionalStateBits;
if (item.mIsGeneratedContent) {
// Ensure that frames created here are all tagged with
// NS_FRAME_GENERATED_CONTENT.
aState.mAdditionalStateBits |= NS_FRAME_GENERATED_CONTENT;
// Note that we're not necessarily setting this property on the primary
// frame for the content for which this is generated content. We might be
// setting it on a table pseudo-frame inserted under that instead. That's
// OK, though; we just need to do the property set so that the content will
// get cleaned up when the frame is destroyed.
aParentFrame->Properties().Set(GenConPseudoToProperty(styleContext->GetPseudo()),
item.mContent);
// Now that we've passed ownership of item.mContent to the frame, unset
// our generated content flag so we don't release or unbind it ourselves.
item.mIsGeneratedContent = false;
}
// XXXbz maybe just inline ConstructFrameFromItemInternal here or something?
ConstructFrameFromItemInternal(item, aState, adjParentFrame, aFrameItems);
aState.mAdditionalStateBits = savedStateBits;
}
inline bool
IsRootBoxFrame(nsIFrame *aFrame)
{
return (aFrame->GetType() == nsGkAtoms::rootFrame);
}
nsresult
nsCSSFrameConstructor::ReconstructDocElementHierarchy()
{
Element* rootElement = mDocument->GetRootElement();
if (!rootElement) {
/* nothing to do */
return NS_OK;
}
return RecreateFramesForContent(rootElement, false);
}
nsIFrame*
nsCSSFrameConstructor::GetFrameFor(nsIContent* aContent)
{
// Get the primary frame associated with the content
nsIFrame* frame = aContent->GetPrimaryFrame();
if (!frame)
return nullptr;
// If the content of the frame is not the desired content then this is not
// really a frame for the desired content.
// XXX This check is needed due to bug 135040. Remove it once that's fixed.
if (frame->GetContent() != aContent) {
return nullptr;
}
nsIFrame* insertionFrame = frame->GetContentInsertionFrame();
NS_ASSERTION(insertionFrame == frame || !frame->IsLeaf(),
"The insertion frame is the primary frame or the primary frame isn't a leaf");
return insertionFrame;
}
nsIFrame*
nsCSSFrameConstructor::GetAbsoluteContainingBlock(nsIFrame* aFrame,
ContainingBlockType aType)
{
NS_PRECONDITION(nullptr != mRootElementFrame, "no root element frame");
// Starting with aFrame, look for a frame that is absolutely positioned or
// relatively positioned (and transformed, if aType is FIXED)
for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) {
if (frame->IsFrameOfType(nsIFrame::eMathML)) {
// If it's mathml, bail out -- no absolute positioning out from inside
// mathml frames. Note that we don't make this part of the loop
// condition because of the stuff at the end of this method...
return nullptr;
}
// If the frame is positioned, we will probably return it as the containing
// block (see the exceptions below). Otherwise, we'll start looking at the
// parent frame, unless we're dealing with a scrollframe.
// Scrollframes are special since they're not positioned, but their
// scrolledframe might be. So, we need to check this special case to return
// the correct containing block (the scrolledframe) in that case.
// If we're looking for a fixed-pos containing block and the frame is
// not transformed, skip it.
if (!frame->IsPositioned() ||
(aType == FIXED_POS && !frame->StyleDisplay()->HasTransform(frame))) {
continue;
}
nsIFrame* absPosCBCandidate = nullptr;
if (frame->GetType() == nsGkAtoms::scrollFrame) {
nsIScrollableFrame* scrollFrame = do_QueryFrame(frame);
absPosCBCandidate = scrollFrame->GetScrolledFrame();
} else {
// Only first continuations can be containing blocks.
absPosCBCandidate = frame->FirstContinuation();
}
// Is the frame really an absolute container?
if (!absPosCBCandidate || !absPosCBCandidate->IsAbsoluteContainer()) {
continue;
}
// For tables, skip the inner frame and consider the outer table frame.
if (absPosCBCandidate->GetType() == nsGkAtoms::tableFrame) {
continue;
}
// For outer table frames, we can just return absPosCBCandidate.
return absPosCBCandidate;
}
// It is possible for the search for the containing block to fail, because
// no absolute container can be found in the parent chain. In those cases,
// we fall back to the document element's containing block.
if (aType == FIXED_POS) {
return mFixedContainingBlock;
}
return mHasRootAbsPosContainingBlock ? mDocElementContainingBlock : nullptr;
}
nsIFrame*
nsCSSFrameConstructor::GetFloatContainingBlock(nsIFrame* aFrame)
{
// Starting with aFrame, look for a frame that is a float containing block.
// IF we hit a mathml frame, bail out; we don't allow floating out of mathml
// frames, because they don't seem to be able to deal.
// The logic here needs to match the logic in ProcessChildren()
for (nsIFrame* containingBlock = aFrame;
containingBlock &&
!ShouldSuppressFloatingOfDescendants(containingBlock);
containingBlock = containingBlock->GetParent()) {
if (containingBlock->IsFloatContainingBlock()) {
return containingBlock;
}
}
// If we didn't find a containing block, then there just isn't
// one.... return null
return nullptr;
}
/**
* This function will check whether aContainer has :after generated content.
* If so, appending to it should actually insert. The return value is the
* parent to use for newly-appended content. *aAfterFrame points to the :after
* frame before which appended content should go, if there is one.
*/
static nsIFrame*
AdjustAppendParentForAfterContent(nsPresContext* aPresContext,
nsIContent* aContainer,
nsIFrame* aParentFrame,
nsIFrame** aAfterFrame)
{
// See if the parent has an :after pseudo-element. Check for the presence
// of style first, since nsLayoutUtils::GetAfterFrame is sorta expensive.
nsStyleContext* parentStyle = aParentFrame->StyleContext();
if (nsLayoutUtils::HasPseudoStyle(aContainer, parentStyle,
nsCSSPseudoElements::ePseudo_after,
aPresContext)) {
// Ensure that the :after frame is on the principal child list.
aParentFrame->DrainSelfOverflowList();
nsIFrame* afterFrame = nsLayoutUtils::GetAfterFrame(aParentFrame);
if (afterFrame) {
*aAfterFrame = afterFrame;
return afterFrame->GetParent();
}
}
*aAfterFrame = nullptr;
if (IsFrameSpecial(aParentFrame)) {
// We might be in a situation where the last part of the {ib} split was
// empty. Since we have no ::after pseudo-element, we do in fact want to be
// appending to that last part, so advance to it if needed. Note that here
// aParentFrame is the result of a GetLastSpecialSibling call, so must be
// either the last or next to last special sibling.
nsIFrame* trailingInline = GetSpecialSibling(aParentFrame);
if (trailingInline) {
aParentFrame = trailingInline;
}
// Always make sure to look at the last continuation of the frame
// for the {ib} case, even if that continuation is empty. We
// don't do this for the non-special-frame case, since in the
// other cases appending to the last nonempty continuation is fine
// and in fact not doing that can confuse code that doesn't know
// to pull kids from continuations other than its next one.
aParentFrame = aParentFrame->LastContinuation();
}
return aParentFrame;
}
/**
* This function will get the previous sibling to use for an append operation.
* it takes a parent frame (must not be null) and its :after frame (may be
* null).
*/
static nsIFrame*
FindAppendPrevSibling(nsIFrame* aParentFrame, nsIFrame* aAfterFrame)
{
if (aAfterFrame) {
NS_ASSERTION(aAfterFrame->GetParent() == aParentFrame, "Wrong parent");
NS_ASSERTION(aAfterFrame->GetPrevSibling() ||
aParentFrame->GetFirstPrincipalChild() == aAfterFrame,
":after frame must be on the principal child list here");
return aAfterFrame->GetPrevSibling();
}
aParentFrame->DrainSelfOverflowList();
return aParentFrame->GetLastChild(kPrincipalList);
}
/**
* This function will get the next sibling for a frame insert operation given
* the parent and previous sibling. aPrevSibling may be null.
*/
static nsIFrame*
GetInsertNextSibling(nsIFrame* aParentFrame, nsIFrame* aPrevSibling)
{
if (aPrevSibling) {
return aPrevSibling->GetNextSibling();
}
return aParentFrame->GetFirstPrincipalChild();
}
/**
* This function is called by ContentAppended() and ContentInserted() when
* appending flowed frames to a parent's principal child list. It handles the
* case where the parent is the trailing inline of an {ib} split.
*/
nsresult
nsCSSFrameConstructor::AppendFramesToParent(nsFrameConstructorState& aState,
nsIFrame* aParentFrame,
nsFrameItems& aFrameList,
nsIFrame* aPrevSibling,
bool aIsRecursiveCall)
{
NS_PRECONDITION(!IsFrameSpecial(aParentFrame) ||
!GetSpecialSibling(aParentFrame) ||
!GetSpecialSibling(aParentFrame)->GetFirstPrincipalChild(),
"aParentFrame has a special sibling with kids?");
NS_PRECONDITION(!aPrevSibling || aPrevSibling->GetParent() == aParentFrame,
"Parent and prevsibling don't match");
nsIFrame* nextSibling = ::GetInsertNextSibling(aParentFrame, aPrevSibling);
NS_ASSERTION(nextSibling ||
!aParentFrame->GetNextContinuation() ||
!aParentFrame->GetNextContinuation()->GetFirstPrincipalChild() ||
aIsRecursiveCall,
"aParentFrame has later continuations with kids?");
NS_ASSERTION(nextSibling ||
!IsFrameSpecial(aParentFrame) ||
(IsInlineFrame(aParentFrame) &&
!GetSpecialSibling(aParentFrame) &&
!aParentFrame->GetNextContinuation()) ||
aIsRecursiveCall,
"aParentFrame is not last?");
// If we're inserting a list of frames at the end of the trailing inline
// of an {ib} split, we may need to create additional {ib} siblings to parent
// them.
if (!nextSibling && IsFrameSpecial(aParentFrame)) {
// When we get here, our frame list might start with a block. If it does
// so, and aParentFrame is an inline, and it and all its previous
// continuations have no siblings, then put the initial blocks from the
// frame list into the previous block of the {ib} split. Note that we
// didn't want to stop at the block part of the split when figuring out
// initial parent, because that could screw up float parenting; it's easier
// to do this little fixup here instead.
if (aFrameList.NotEmpty() && !aFrameList.FirstChild()->IsInlineOutside()) {
// See whether our trailing inline is empty
nsIFrame* firstContinuation = aParentFrame->FirstContinuation();
if (firstContinuation->PrincipalChildList().IsEmpty()) {
// Our trailing inline is empty. Collect our starting blocks from
// aFrameList, get the right parent frame for them, and put them in.
nsFrameList::FrameLinkEnumerator firstNonBlockEnumerator =
FindFirstNonBlock(aFrameList);
nsFrameList blockKids = aFrameList.ExtractHead(firstNonBlockEnumerator);
NS_ASSERTION(blockKids.NotEmpty(), "No blocks?");
nsIFrame* prevBlock =
GetSpecialPrevSibling(firstContinuation)->LastContinuation();
NS_ASSERTION(prevBlock, "Should have previous block here");
MoveChildrenTo(aState.mPresContext, aParentFrame, prevBlock, blockKids);
}
}
// We want to put some of the frames into this inline frame.
nsFrameList::FrameLinkEnumerator firstBlockEnumerator(aFrameList);
FindFirstBlock(firstBlockEnumerator);
nsFrameList inlineKids = aFrameList.ExtractHead(firstBlockEnumerator);
if (!inlineKids.IsEmpty()) {
AppendFrames(aParentFrame, kPrincipalList, inlineKids);
}
if (!aFrameList.IsEmpty()) {
bool positioned = aParentFrame->IsRelativelyPositioned();
nsFrameItems ibSiblings;
CreateIBSiblings(aState, aParentFrame, positioned, aFrameList,
ibSiblings);
// Make sure to trigger reflow of the inline that used to be our
// last one and now isn't anymore, since its GetSkipSides() has
// changed.
mPresShell->FrameNeedsReflow(aParentFrame,
nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
// Recurse so we create new ib siblings as needed for aParentFrame's parent
return AppendFramesToParent(aState, aParentFrame->GetParent(), ibSiblings,
aParentFrame, true);
}
return NS_OK;
}
// Insert the frames after our aPrevSibling
return InsertFrames(aParentFrame, kPrincipalList, aPrevSibling, aFrameList);
}
#define UNSET_DISPLAY 255
// This gets called to see if the frames corresponding to aSibling and aContent
// should be siblings in the frame tree. Although (1) rows and cols, (2) row
// groups and col groups, (3) row groups and captions, (4) legends and content
// inside fieldsets, (5) popups and other kids of the menu are siblings from a
// content perspective, they are not considered siblings in the frame tree.
bool
nsCSSFrameConstructor::IsValidSibling(nsIFrame* aSibling,
nsIContent* aContent,
uint8_t& aDisplay)
{
nsIFrame* parentFrame = aSibling->GetParent();
nsIAtom* parentType = nullptr;
nsIAtom* grandparentType = nullptr;
if (parentFrame) {
parentType = parentFrame->GetType();
nsIFrame* grandparentFrame = parentFrame->GetParent();
if (grandparentFrame) {
grandparentType = grandparentFrame->GetType();
}
}
uint8_t siblingDisplay = aSibling->GetDisplay();
if ((NS_STYLE_DISPLAY_TABLE_COLUMN_GROUP == siblingDisplay) ||
(NS_STYLE_DISPLAY_TABLE_COLUMN == siblingDisplay) ||
(NS_STYLE_DISPLAY_TABLE_CAPTION == siblingDisplay) ||
(NS_STYLE_DISPLAY_TABLE_HEADER_GROUP == siblingDisplay) ||
(NS_STYLE_DISPLAY_TABLE_ROW_GROUP == siblingDisplay) ||
(NS_STYLE_DISPLAY_TABLE_FOOTER_GROUP == siblingDisplay) ||
nsGkAtoms::menuFrame == parentType) {
// if we haven't already, construct a style context to find the display type of aContent
if (UNSET_DISPLAY == aDisplay) {
nsRefPtr<nsStyleContext> styleContext;
nsIFrame* styleParent = aSibling->GetParentStyleContextFrame();
if (!styleParent) {
NS_NOTREACHED("Shouldn't happen");
return false;
}
// XXXbz when this code is killed, the state argument to
// ResolveStyleContext can be made non-optional.
styleContext = ResolveStyleContext(styleParent, aContent, nullptr);
const nsStyleDisplay* display = styleContext->StyleDisplay();
aDisplay = display->mDisplay;
}
if (nsGkAtoms::menuFrame == parentType) {
return
(NS_STYLE_DISPLAY_POPUP == aDisplay) ==
(NS_STYLE_DISPLAY_POPUP == siblingDisplay);
}
// To have decent performance we want to return false in cases in which
// reordering the two siblings has no effect on display. To ensure
// correctness, we MUST return false in cases where the two siblings have
// the same desired parent type and live on different display lists.
// Specificaly, columns and column groups should only consider columns and
// column groups as valid siblings. Captions should only consider other
// captions. All other things should consider each other as valid
// siblings. The restriction in the |if| above on siblingDisplay is ok,
// because for correctness the only part that really needs to happen is to
// not consider captions, column groups, and row/header/footer groups
// siblings of each other. Treating a column or colgroup as a valid
// sibling of a non-table-related frame will just mean we end up reframing.
if ((siblingDisplay == NS_STYLE_DISPLAY_TABLE_CAPTION) !=
(aDisplay == NS_STYLE_DISPLAY_TABLE_CAPTION)) {
// One's a caption and the other is not. Not valid siblings.
return false;
}
if ((siblingDisplay == NS_STYLE_DISPLAY_TABLE_COLUMN_GROUP ||
siblingDisplay == NS_STYLE_DISPLAY_TABLE_COLUMN) !=
(aDisplay == NS_STYLE_DISPLAY_TABLE_COLUMN_GROUP ||
aDisplay == NS_STYLE_DISPLAY_TABLE_COLUMN)) {
// One's a column or column group and the other is not. Not valid
// siblings.
return false;
}
return true;
}
else if (nsGkAtoms::fieldSetFrame == parentType ||
(nsGkAtoms::fieldSetFrame == grandparentType &&
nsGkAtoms::blockFrame == parentType)) {
// Legends can be sibling of legends but not of other content in the fieldset
nsIAtom* sibType = aSibling->GetContentInsertionFrame()->GetType();
bool legendContent = aContent->IsHTML(nsGkAtoms::legend);
if ((legendContent && (nsGkAtoms::legendFrame != sibType)) ||
(!legendContent && (nsGkAtoms::legendFrame == sibType)))
return false;
}
return true;
}
nsIFrame*
nsCSSFrameConstructor::FindFrameForContentSibling(nsIContent* aContent,
nsIContent* aTargetContent,
uint8_t& aTargetContentDisplay,
bool aPrevSibling)
{
nsIFrame* sibling = aContent->GetPrimaryFrame();
if (!sibling || sibling->GetContent() != aContent) {
// XXX the GetContent() != aContent check is needed due to bug 135040.
// Remove it once that's fixed.
return nullptr;
}
// If the frame is out-of-flow, GetPrimaryFrame() will have returned the
// out-of-flow frame; we want the placeholder.
if (sibling->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
nsIFrame* placeholderFrame = GetPlaceholderFrameFor(sibling);
NS_ASSERTION(placeholderFrame, "no placeholder for out-of-flow frame");
sibling = placeholderFrame;
}
// The frame we have now should never be a continuation
NS_ASSERTION(!sibling->GetPrevContinuation(), "How did that happen?");
if (aPrevSibling) {
// The frame may be a special frame (a split inline frame that
// contains a block). Get the last part of that split.
if (IsFrameSpecial(sibling)) {
sibling = GetLastSpecialSibling(sibling, true);
}
// The frame may have a continuation. If so, we want the last
// non-overflow-container continuation as our previous sibling.
sibling = sibling->GetTailContinuation();
}
if (aTargetContent &&
!IsValidSibling(sibling, aTargetContent, aTargetContentDisplay)) {
sibling = nullptr;
}
return sibling;
}
nsIFrame*
nsCSSFrameConstructor::FindPreviousSibling(FlattenedChildIterator aIter,
uint8_t& aTargetContentDisplay)
{
nsIContent* child = aIter.Get();
// Note: not all content objects are associated with a frame (e.g., if it's
// `display: none') so keep looking until we find a previous frame
while (nsIContent* sibling = aIter.GetPreviousChild()) {
nsIFrame* prevSibling =
FindFrameForContentSibling(sibling, child, aTargetContentDisplay, true);
if (prevSibling) {
// Found a previous sibling, we're done!
return prevSibling;
}
}
return nullptr;
}
nsIFrame*
nsCSSFrameConstructor::FindNextSibling(FlattenedChildIterator aIter,
uint8_t& aTargetContentDisplay)
{
nsIContent* child = aIter.Get();
while (nsIContent* sibling = aIter.GetNextChild()) {
nsIFrame* nextSibling =
FindFrameForContentSibling(sibling, child, aTargetContentDisplay, false);
if (nextSibling) {
// We found a next sibling, we're done!
return nextSibling;
}
}
return nullptr;
}
// For fieldsets, returns the area frame, if the child is not a legend.
static nsIFrame*
GetAdjustedParentFrame(nsIFrame* aParentFrame,
nsIAtom* aParentFrameType,
nsIContent* aChildContent)
{
NS_PRECONDITION(nsGkAtoms::tableOuterFrame != aParentFrameType,
"Shouldn't be happening!");
nsIFrame* newParent = nullptr;
if (nsGkAtoms::fieldSetFrame == aParentFrameType) {
// If the parent is a fieldSet, use the fieldSet's area frame as the
// parent unless the new content is a legend.
if (!aChildContent->IsHTML(nsGkAtoms::legend)) {
newParent = GetFieldSetBlockFrame(aParentFrame);
}
}
return (newParent) ? newParent : aParentFrame;
}
nsIFrame*
nsCSSFrameConstructor::GetInsertionPrevSibling(nsIFrame*& aParentFrame,
nsIContent* aContainer,
nsIContent* aChild,
bool* aIsAppend,
bool* aIsRangeInsertSafe,
nsIContent* aStartSkipChild,
nsIContent* aEndSkipChild)
{
*aIsAppend = false;
// Find the frame that precedes the insertion point. Walk backwards
// from the parent frame to get the parent content, because if an
// XBL insertion point is involved, we'll need to use _that_ to find
// the preceding frame.
NS_PRECONDITION(aParentFrame, "Must have parent frame to start with");
nsIContent* container = aParentFrame->GetContent();
FlattenedChildIterator iter(container);
bool xblCase = iter.XBLInvolved() || container != aContainer;
if (xblCase || !aChild->IsRootOfAnonymousSubtree()) {
// The check for IsRootOfAnonymousSubtree() is because editor is
// severely broken and calls us directly for native anonymous
// nodes that it creates.
if (aStartSkipChild) {
iter.Seek(aStartSkipChild);
} else {
iter.Seek(aChild);
}
} else {
// Prime the iterator for the call to FindPreviousSibling.
iter.GetNextChild();
NS_WARNING("Someone passed native anonymous content directly into frame "
"construction. Stop doing that!");
}
// Note that FindPreviousSibling is passed the iterator by value, so that
// the later usage of the iterator starts from the same place.
uint8_t childDisplay = UNSET_DISPLAY;
nsIFrame* prevSibling = FindPreviousSibling(iter, childDisplay);
// Now, find the geometric parent so that we can handle
// continuations properly. Use the prev sibling if we have it;
// otherwise use the next sibling.
if (prevSibling) {
aParentFrame = prevSibling->GetParent()->GetContentInsertionFrame();
}
else {
// If there is no previous sibling, then find the frame that follows
if (aEndSkipChild) {
iter.Seek(aEndSkipChild);
iter.GetPreviousChild();
}
nsIFrame* nextSibling = FindNextSibling(iter, childDisplay);
if (nextSibling) {
aParentFrame = nextSibling->GetParent()->GetContentInsertionFrame();
}
else {
// No previous or next sibling, so treat this like an appended frame.
*aIsAppend = true;
if (IsFrameSpecial(aParentFrame)) {
// Since we're appending, we'll walk to the last anonymous frame
// that was created for the broken inline frame. But don't walk
// to the trailing inline if it's empty; stop at the block.
aParentFrame = GetLastSpecialSibling(aParentFrame, false);
}
// Get continuation that parents the last child. This MUST be done
// before the AdjustAppendParentForAfterContent call.
aParentFrame = nsLayoutUtils::LastContinuationWithChild(aParentFrame);
// Deal with fieldsets
aParentFrame = ::GetAdjustedParentFrame(aParentFrame,
aParentFrame->GetType(),
aChild);
nsIFrame* appendAfterFrame;
aParentFrame =
::AdjustAppendParentForAfterContent(mPresShell->GetPresContext(),
container, aParentFrame,
&appendAfterFrame);
prevSibling = ::FindAppendPrevSibling(aParentFrame, appendAfterFrame);
}
}
*aIsRangeInsertSafe = (childDisplay == UNSET_DISPLAY);
return prevSibling;
}
static bool
IsSpecialFramesetChild(nsIContent* aContent)
{
// IMPORTANT: This must match the conditions in nsHTMLFramesetFrame::Init.
return aContent->IsHTML() &&
(aContent->Tag() == nsGkAtoms::frameset ||
aContent->Tag() == nsGkAtoms::frame);
}
static void
InvalidateCanvasIfNeeded(nsIPresShell* presShell, nsIContent* node);
#ifdef MOZ_XUL
static
bool
IsXULListBox(nsIContent* aContainer)
{
return (aContainer->IsXUL() && aContainer->Tag() == nsGkAtoms::listbox);
}
static
nsListBoxBodyFrame*
MaybeGetListBoxBodyFrame(nsIContent* aContainer, nsIContent* aChild)
{
if (!aContainer)
return nullptr;
if (IsXULListBox(aContainer) &&
aChild->IsXUL() && aChild->Tag() == nsGkAtoms::listitem) {
nsCOMPtr<nsIDOMXULElement> xulElement = do_QueryInterface(aContainer);
nsCOMPtr<nsIBoxObject> boxObject;
xulElement->GetBoxObject(getter_AddRefs(boxObject));
nsCOMPtr<nsPIListBoxObject> listBoxObject = do_QueryInterface(boxObject);
if (listBoxObject) {
return listBoxObject->GetListBoxBody(false);
}
}
return nullptr;
}
#endif
void
nsCSSFrameConstructor::AddTextItemIfNeeded(nsFrameConstructorState& aState,
nsIFrame* aParentFrame,
nsIContent* aPossibleTextContent,
FrameConstructionItemList& aItems)
{
NS_PRECONDITION(aPossibleTextContent, "Must have node");
if (!aPossibleTextContent->IsNodeOfType(nsINode::eTEXT) ||
!aPossibleTextContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE)) {
// Not text, or not suppressed due to being all-whitespace (if it
// were being suppressed, it would have the
// NS_CREATE_FRAME_IF_NON_WHITESPACE flag)
return;
}
NS_ASSERTION(!aPossibleTextContent->GetPrimaryFrame(),
"Text node has a frame and NS_CREATE_FRAME_IF_NON_WHITESPACE");
AddFrameConstructionItems(aState, aPossibleTextContent, false,
aParentFrame, aItems);
}
void
nsCSSFrameConstructor::ReframeTextIfNeeded(nsIContent* aParentContent,
nsIContent* aContent)
{
if (!aContent->IsNodeOfType(nsINode::eTEXT) ||
!aContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE)) {
// Not text, or not suppressed due to being all-whitespace (if it
// were being suppressed, it would have the
// NS_CREATE_FRAME_IF_NON_WHITESPACE flag)
return;
}
NS_ASSERTION(!aContent->GetPrimaryFrame(),
"Text node has a frame and NS_CREATE_FRAME_IF_NON_WHITESPACE");
ContentInserted(aParentContent, aContent, nullptr, false);
}
// For inserts aChild should be valid, for appends it should be null.
// Returns true if this operation can be lazy, false if not.
bool
nsCSSFrameConstructor::MaybeConstructLazily(Operation aOperation,
nsIContent* aContainer,
nsIContent* aChild)
{
if (mPresShell->GetPresContext()->IsChrome() || !aContainer ||
aContainer->IsInNativeAnonymousSubtree() || aContainer->IsXUL()) {
return false;
}
if (aOperation == CONTENTINSERT) {
if (aChild->IsRootOfAnonymousSubtree() ||
aChild->IsEditable() || aChild->IsXUL()) {
return false;
}
} else { // CONTENTAPPEND
NS_ASSERTION(aOperation == CONTENTAPPEND,
"operation should be either insert or append");
for (nsIContent* child = aChild; child; child = child->GetNextSibling()) {
NS_ASSERTION(!child->IsRootOfAnonymousSubtree(),
"Should be coming through the CONTENTAPPEND case");
if (child->IsXUL() || child->IsEditable()) {
return false;
}
}
}
// We can construct lazily; just need to set suitable bits in the content
// tree.
// Walk up the tree setting the NODE_DESCENDANTS_NEED_FRAMES bit as we go.
nsIContent* content = aContainer;
#ifdef DEBUG
// If we hit a node with no primary frame, or the NODE_NEEDS_FRAME bit set
// we want to assert, but leaf frames that process their own children and may
// ignore anonymous children (eg framesets) make this complicated. So we set
// these two booleans if we encounter these situations and unset them if we
// hit a node with a leaf frame.
bool noPrimaryFrame = false;
bool needsFrameBitSet = false;
#endif
while (content &&
!content->HasFlag(NODE_DESCENDANTS_NEED_FRAMES)) {
#ifdef DEBUG
if (content->GetPrimaryFrame() && content->GetPrimaryFrame()->IsLeaf()) {
noPrimaryFrame = needsFrameBitSet = false;
}
if (!noPrimaryFrame && !content->GetPrimaryFrame()) {
noPrimaryFrame = true;
}
if (!needsFrameBitSet && content->HasFlag(NODE_NEEDS_FRAME)) {
needsFrameBitSet = true;
}
#endif
content->SetFlags(NODE_DESCENDANTS_NEED_FRAMES);
content = content->GetFlattenedTreeParent();
}
#ifdef DEBUG
if (content && content->GetPrimaryFrame() &&
content->GetPrimaryFrame()->IsLeaf()) {
noPrimaryFrame = needsFrameBitSet = false;
}
NS_ASSERTION(!noPrimaryFrame, "Ancestors of nodes with frames to be "
"constructed lazily should have frames");
NS_ASSERTION(!needsFrameBitSet, "Ancestors of nodes with frames to be "
"constructed lazily should not have NEEDS_FRAME bit set");
#endif
// Set NODE_NEEDS_FRAME on the new nodes.
if (aOperation == CONTENTINSERT) {
NS_ASSERTION(!aChild->GetPrimaryFrame() ||
aChild->GetPrimaryFrame()->GetContent() != aChild,
//XXX the aChild->GetPrimaryFrame()->GetContent() != aChild
// check is needed due to bug 135040. Remove it once that's
// fixed.
"setting NEEDS_FRAME on a node that already has a frame?");
aChild->SetFlags(NODE_NEEDS_FRAME);
} else { // CONTENTAPPEND
for (nsIContent* child = aChild; child; child = child->GetNextSibling()) {
NS_ASSERTION(!child->GetPrimaryFrame() ||
child->GetPrimaryFrame()->GetContent() != child,
//XXX the child->GetPrimaryFrame()->GetContent() != child
// check is needed due to bug 135040. Remove it once that's
// fixed.
"setting NEEDS_FRAME on a node that already has a frame?");
child->SetFlags(NODE_NEEDS_FRAME);
}
}
RestyleManager()->PostRestyleEventForLazyConstruction();
return true;
}
void
nsCSSFrameConstructor::CreateNeededFrames(nsIContent* aContent)
{
NS_ASSERTION(!aContent->HasFlag(NODE_NEEDS_FRAME),
"shouldn't get here with a content node that has needs frame bit set");
NS_ASSERTION(aContent->HasFlag(NODE_DESCENDANTS_NEED_FRAMES),
"should only get here with a content node that has descendants needing frames");
aContent->UnsetFlags(NODE_DESCENDANTS_NEED_FRAMES);
// We could either descend first (on nodes that don't have NODE_NEEDS_FRAME
// set) or issue content notifications for our kids first. In absence of
// anything definitive either way we'll go with the latter.
// It might be better to use GetChildArray and scan it completely first and
// then issue all notifications. (We have to scan it completely first because
// constructing frames can set attributes, which can change the storage of
// child lists).
// Scan the children of aContent to see what operations (if any) we need to
// perform.
uint32_t childCount = aContent->GetChildCount();
bool inRun = false;
nsIContent* firstChildInRun = nullptr;
for (uint32_t i = 0; i < childCount; i++) {
nsIContent* child = aContent->GetChildAt(i);
if (child->HasFlag(NODE_NEEDS_FRAME)) {
NS_ASSERTION(!child->GetPrimaryFrame() ||
child->GetPrimaryFrame()->GetContent() != child,
//XXX the child->GetPrimaryFrame()->GetContent() != child
// check is needed due to bug 135040. Remove it once that's
// fixed.
"NEEDS_FRAME set on a node that already has a frame?");
if (!inRun) {
inRun = true;
firstChildInRun = child;
}
} else {
if (inRun) {
inRun = false;
// generate a ContentRangeInserted for [startOfRun,i)
ContentRangeInserted(aContent, firstChildInRun, child, nullptr,
false);
}
}
}
if (inRun) {
ContentAppended(aContent, firstChildInRun, false);
}
// Now descend.
FlattenedChildIterator iter(aContent);
for (nsIContent* child = iter.GetNextChild(); child; child = iter.GetNextChild()) {
if (child->HasFlag(NODE_DESCENDANTS_NEED_FRAMES)) {
CreateNeededFrames(child);
}
}
}
void nsCSSFrameConstructor::CreateNeededFrames()
{
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"Someone forgot a script blocker");
Element* rootElement = mDocument->GetRootElement();
NS_ASSERTION(!rootElement || !rootElement->HasFlag(NODE_NEEDS_FRAME),
"root element should not have frame created lazily");
if (rootElement && rootElement->HasFlag(NODE_DESCENDANTS_NEED_FRAMES)) {
BeginUpdate();
CreateNeededFrames(rootElement);
EndUpdate();
}
}
void
nsCSSFrameConstructor::IssueSingleInsertNofications(nsIContent* aContainer,
nsIContent* aStartChild,
nsIContent* aEndChild,
bool aAllowLazyConstruction)
{
for (nsIContent* child = aStartChild;
child != aEndChild;
child = child->GetNextSibling()) {
if ((child->GetPrimaryFrame() ||
GetUndisplayedContent(child))
#ifdef MOZ_XUL
// Except listboxes suck, so do NOT skip anything here if
// we plan to notify a listbox.
&& !MaybeGetListBoxBodyFrame(aContainer, child)
#endif
) {
// Already have a frame or undisplayed entry for this content; a
// previous ContentInserted in this loop must have reconstructed
// its insertion parent. Skip it.
continue;
}
// Call ContentInserted with this node.
ContentInserted(aContainer, child, mTempFrameTreeState,
aAllowLazyConstruction);
}
}
nsIFrame*
nsCSSFrameConstructor::GetRangeInsertionPoint(nsIContent* aContainer,
nsIContent* aStartChild,
nsIContent* aEndChild,
bool aAllowLazyConstruction)
{
// See if we have an XBL insertion point. If so, then that's our
// real parent frame; if not, then the frame hasn't been built yet
// and we just bail.
bool multiple = false;
nsIFrame* insertionPoint = GetInsertionPoint(aContainer, nullptr, &multiple);
if (!insertionPoint && !multiple)
return nullptr; // Don't build the frames.
bool hasInsertion = false;
if (!multiple) {
// XXXbz XBL2/sXBL issue
nsIDocument* document = aStartChild->GetDocument();
// XXXbz how would |document| be null here?
if (document && aStartChild->GetXBLInsertionParent()) {
hasInsertion = true;
}
}
if (multiple || hasInsertion) {
// We have an insertion point. There are some additional tests we need to do
// in order to ensure that an append is a safe operation.
uint32_t childCount = 0;
if (!multiple) {
// We may need to make multiple ContentInserted calls instead. A
// reasonable heuristic to employ (in order to maintain good performance)
// is to find out if the insertion point's content node contains any
// explicit children. If it does not, then it is highly likely that
// an append is occurring. (Note it is not definite, and there are insane
// cases we will not deal with by employing this heuristic, but it beats
// always falling back to multiple ContentInserted calls).
//
// In the multiple insertion point case, we know we're going to need to do
// multiple ContentInserted calls anyway.
// XXXndeakin This test doesn't work in the new world. Or rather, it works, but
// it's slow
childCount = insertionPoint->GetContent()->GetChildCount();
}
// If we have multiple insertion points or if we have an insertion point
// and the operation is not a true append or if the insertion point already
// has explicit children, then we must fall back.
if (multiple || aEndChild != nullptr || childCount > 0) {
// Now comes the fun part. For each inserted child, make a
// ContentInserted call as if it had just gotten inserted and
// let ContentInserted handle the mess.
IssueSingleInsertNofications(aContainer, aStartChild, aEndChild,
aAllowLazyConstruction);
return nullptr;
}
}
return insertionPoint;
}
bool
nsCSSFrameConstructor::MaybeRecreateForFrameset(nsIFrame* aParentFrame,
nsIContent* aStartChild,
nsIContent* aEndChild)
{
if (aParentFrame->GetType() == nsGkAtoms::frameSetFrame) {
// Check whether we have any kids we care about.
for (nsIContent* cur = aStartChild;
cur != aEndChild;
cur = cur->GetNextSibling()) {
if (IsSpecialFramesetChild(cur)) {
// Just reframe the parent, since framesets are weird like that.
RecreateFramesForContent(aParentFrame->GetContent(), false);
return true;
}
}
}
return false;
}
nsresult
nsCSSFrameConstructor::ContentAppended(nsIContent* aContainer,
nsIContent* aFirstNewContent,
bool aAllowLazyConstruction)
{
AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
NS_PRECONDITION(mUpdateCount != 0,
"Should be in an update while creating frames");
#ifdef DEBUG
if (gNoisyContentUpdates) {
printf("nsCSSFrameConstructor::ContentAppended container=%p "
"first-child=%p lazy=%d\n",
static_cast<void*>(aContainer), aFirstNewContent,
aAllowLazyConstruction);
if (gReallyNoisyContentUpdates && aContainer) {
aContainer->List(stdout, 0);
}
}
#endif
#ifdef DEBUG
for (nsIContent* child = aFirstNewContent;
child;
child = child->GetNextSibling()) {
// XXX the GetContent() != child check is needed due to bug 135040.
// Remove it once that's fixed.
NS_ASSERTION(!child->GetPrimaryFrame() ||
child->GetPrimaryFrame()->GetContent() != child,
"asked to construct a frame for a node that already has a frame");
}
#endif
#ifdef MOZ_XUL
if (aContainer) {
int32_t namespaceID;
nsIAtom* tag =
mDocument->BindingManager()->ResolveTag(aContainer, &namespaceID);
// Just ignore tree tags, anyway we don't create any frames for them.
if (tag == nsGkAtoms::treechildren ||
tag == nsGkAtoms::treeitem ||
tag == nsGkAtoms::treerow)
return NS_OK;
}
#endif // MOZ_XUL
// Get the frame associated with the content
nsIFrame* parentFrame = GetFrameFor(aContainer);
// See comment in ContentRangeInserted for why this is necessary.
if (!parentFrame && !aContainer->IsActiveChildrenElement()) {
return NS_OK;
}
if (aAllowLazyConstruction &&
MaybeConstructLazily(CONTENTAPPEND, aContainer, aFirstNewContent)) {
return NS_OK;
}
LAYOUT_PHASE_TEMP_EXIT();
parentFrame = GetRangeInsertionPoint(aContainer,
aFirstNewContent, nullptr,
aAllowLazyConstruction);
LAYOUT_PHASE_TEMP_REENTER();
if (!parentFrame) {
return NS_OK;
}
LAYOUT_PHASE_TEMP_EXIT();
if (MaybeRecreateForFrameset(parentFrame, aFirstNewContent, nullptr)) {
LAYOUT_PHASE_TEMP_REENTER();
return NS_OK;
}
LAYOUT_PHASE_TEMP_REENTER();
if (parentFrame->IsLeaf()) {
// Nothing to do here; we shouldn't be constructing kids of leaves
// Clear lazy bits so we don't try to construct again.
ClearLazyBits(aFirstNewContent, nullptr);
return NS_OK;
}
if (parentFrame->IsFrameOfType(nsIFrame::eMathML)) {
LAYOUT_PHASE_TEMP_EXIT();
nsresult rv = RecreateFramesForContent(parentFrame->GetContent(), false);
LAYOUT_PHASE_TEMP_REENTER();
return rv;
}
// If the frame we are manipulating is a ``special'' frame (that is, one
// that's been created as a result of a block-in-inline situation) then we
// need to append to the last special sibling, not to the frame itself.
bool parentSpecial = IsFrameSpecial(parentFrame);
if (parentSpecial) {
#ifdef DEBUG
if (gNoisyContentUpdates) {
printf("nsCSSFrameConstructor::ContentAppended: parentFrame=");
nsFrame::ListTag(stdout, parentFrame);
printf(" is special\n");
}
#endif
// Since we're appending, we'll walk to the last anonymous frame
// that was created for the broken inline frame. But don't walk
// to the trailing inline if it's empty; stop at the block.
parentFrame = GetLastSpecialSibling(parentFrame, false);
}
// Get continuation that parents the last child. This MUST be done
// before the AdjustAppendParentForAfterContent call.
parentFrame = nsLayoutUtils::LastContinuationWithChild(parentFrame);
// We should never get here with fieldsets, since they have multiple
// insertion points.
NS_ASSERTION(parentFrame->GetType() != nsGkAtoms::fieldSetFrame,
"Unexpected parent");
// Deal with possible :after generated content on the parent
nsIFrame* parentAfterFrame;
parentFrame =
::AdjustAppendParentForAfterContent(mPresShell->GetPresContext(),
aContainer, parentFrame,
&parentAfterFrame);
// Create some new frames
nsFrameConstructorState state(mPresShell,
GetAbsoluteContainingBlock(parentFrame, FIXED_POS),
GetAbsoluteContainingBlock(parentFrame, ABS_POS),
GetFloatContainingBlock(parentFrame));
state.mTreeMatchContext.InitAncestors(aContainer->AsElement());
// See if the containing block has :first-letter style applied.
bool haveFirstLetterStyle = false, haveFirstLineStyle = false;
nsIFrame* containingBlock = state.mFloatedItems.containingBlock;
if (containingBlock) {
haveFirstLetterStyle = HasFirstLetterStyle(containingBlock);
haveFirstLineStyle =
ShouldHaveFirstLineStyle(containingBlock->GetContent(),
containingBlock->StyleContext());
}
if (haveFirstLetterStyle) {
// Before we get going, remove the current letter frames
RemoveLetterFrames(state.mPresContext, state.mPresShell,
containingBlock);
}
nsIAtom* frameType = parentFrame->GetType();
FlattenedChildIterator iter(aContainer);
bool haveNoXBLChildren = (!iter.XBLInvolved() || !iter.GetNextChild());
FrameConstructionItemList items;
if (aFirstNewContent->GetPreviousSibling() &&
GetParentType(frameType) == eTypeBlock &&
haveNoXBLChildren) {
// If there's a text node in the normal content list just before the new
// items, and it has no frame, make a frame construction item for it. If it
// doesn't need a frame, ConstructFramesFromItemList below won't give it
// one. No need to do all this if our parent type is not block, though,
// since WipeContainingBlock already handles that situation.
//
// Because we're appending, we don't need to worry about any text
// after the appended content; there can only be XBL anonymous content
// (text in an XBL binding is not suppressed) or generated content
// (and bare text nodes are not generated). Native anonymous content
// generated by frames never participates in inline layout.
AddTextItemIfNeeded(state, parentFrame,
aFirstNewContent->GetPreviousSibling(), items);
}
for (nsIContent* child = aFirstNewContent;
child;
child = child->GetNextSibling()) {
AddFrameConstructionItems(state, child, false, parentFrame, items);
}
nsIFrame* prevSibling = ::FindAppendPrevSibling(parentFrame, parentAfterFrame);
// Perform special check for diddling around with the frames in
// a special inline frame.
// If we're appending before :after content, then we're not really
// appending, so let WipeContainingBlock know that.
LAYOUT_PHASE_TEMP_EXIT();
if (WipeContainingBlock(state, containingBlock, parentFrame, items,
true, prevSibling)) {
LAYOUT_PHASE_TEMP_REENTER();
return NS_OK;
}
LAYOUT_PHASE_TEMP_REENTER();
// If the parent is a block frame, and we're not in a special case
// where frames can be moved around, determine if the list is for the
// start or end of the block.
if (nsLayoutUtils::GetAsBlock(parentFrame) && !haveFirstLetterStyle &&
!haveFirstLineStyle && !parentSpecial) {
items.SetLineBoundaryAtStart(!prevSibling ||
!prevSibling->IsInlineOutside() ||
prevSibling->GetType() == nsGkAtoms::brFrame);
// :after content can't be <br> so no need to check it
items.SetLineBoundaryAtEnd(!parentAfterFrame ||
!parentAfterFrame->IsInlineOutside());
}
// To suppress whitespace-only text frames, we have to verify that
// our container's DOM child list matches its flattened tree child list.
items.SetParentHasNoXBLChildren(haveNoXBLChildren);
nsFrameItems frameItems;
ConstructFramesFromItemList(state, items, parentFrame, frameItems);
for (nsIContent* child = aFirstNewContent;
child;
child = child->GetNextSibling()) {
// Invalidate now instead of before the WipeContainingBlock call, just in
// case we do wipe; in that case we don't need to do this walk at all.
// XXXbz does that matter? Would it make more sense to save some virtual
// GetChildAt calls instead and do this during construction of our
// FrameConstructionItemList?
InvalidateCanvasIfNeeded(mPresShell, child);
}
// if the container is a table and a caption was appended, it needs to be put
// in the outer table frame's additional child list.
nsFrameItems captionItems;
if (nsGkAtoms::tableFrame == frameType) {
// Pull out the captions. Note that we don't want to do that as we go,
// because processing a single caption can add a whole bunch of things to
// the frame items due to pseudoframe processing. So we'd have to pull
// captions from a list anyway; might as well do that here.
// XXXbz this is no longer true; we could pull captions directly out of the
// FrameConstructionItemList now.
PullOutCaptionFrames(frameItems, captionItems);
}
if (haveFirstLineStyle && parentFrame == containingBlock) {
// It's possible that some of the new frames go into a
// first-line frame. Look at them and see...
AppendFirstLineFrames(state, containingBlock->GetContent(),
containingBlock, frameItems);
}
// Notify the parent frame passing it the list of new frames
// Append the flowed frames to the principal child list; captions
// need special treatment
if (captionItems.NotEmpty()) { // append the caption to the outer table
NS_ASSERTION(nsGkAtoms::tableFrame == frameType, "how did that happen?");
nsIFrame* outerTable = parentFrame->GetParent();
AppendFrames(outerTable, nsIFrame::kCaptionList, captionItems);
}
if (frameItems.NotEmpty()) { // append the in-flow kids
AppendFramesToParent(state, parentFrame, frameItems, prevSibling);
}
// Recover first-letter frames
if (haveFirstLetterStyle) {
RecoverLetterFrames(containingBlock);
}
#ifdef DEBUG
if (gReallyNoisyContentUpdates) {
printf("nsCSSFrameConstructor::ContentAppended: resulting frame model:\n");
parentFrame->List(stdout, 0);
}
#endif
#ifdef ACCESSIBILITY
nsAccessibilityService* accService = nsIPresShell::AccService();
if (accService) {
accService->ContentRangeInserted(mPresShell, aContainer,
aFirstNewContent, nullptr);
}
#endif
return NS_OK;
}
#ifdef MOZ_XUL
enum content_operation
{
CONTENT_INSERTED,
CONTENT_REMOVED
};
// Helper function to lookup the listbox body frame and send a notification
// for insertion or removal of content
static
bool NotifyListBoxBody(nsPresContext* aPresContext,
nsIContent* aContainer,
nsIContent* aChild,
// Only used for the removed notification
nsIContent* aOldNextSibling,
nsIDocument* aDocument,
nsIFrame* aChildFrame,
content_operation aOperation)
{
nsListBoxBodyFrame* listBoxBodyFrame =
MaybeGetListBoxBodyFrame(aContainer, aChild);
if (listBoxBodyFrame) {
if (aOperation == CONTENT_REMOVED) {
// Except if we have an aChildFrame and its parent is not the right
// thing, then we don't do this. Pseudo frames are so much fun....
if (!aChildFrame || aChildFrame->GetParent() == listBoxBodyFrame) {
listBoxBodyFrame->OnContentRemoved(aPresContext, aContainer,
aChildFrame, aOldNextSibling);
return true;
}
} else {
listBoxBodyFrame->OnContentInserted(aPresContext, aChild);
return true;
}
}
return false;
}
#endif // MOZ_XUL
nsresult
nsCSSFrameConstructor::ContentInserted(nsIContent* aContainer,
nsIContent* aChild,
nsILayoutHistoryState* aFrameState,
bool aAllowLazyConstruction)
{
return ContentRangeInserted(aContainer,
aChild,
aChild->GetNextSibling(),
aFrameState,
aAllowLazyConstruction);
}
// ContentRangeInserted handles creating frames for a range of nodes that
// aren't at the end of their childlist. ContentRangeInserted isn't a real
// content notification, but rather it handles regular ContentInserted calls
// for a single node as well as the lazy construction of frames for a range of
// nodes when called from CreateNeededFrames. For a range of nodes to be
// suitable to have its frames constructed all at once they must meet the same
// conditions that ContentAppended imposes (GetRangeInsertionPoint checks
// these), plus more. Namely when finding the insertion prevsibling we must not
// need to consult something specific to any one node in the range, so that the
// insertion prevsibling would be the same for each node in the range. So we
// pass the first node in the range to GetInsertionPrevSibling, and if
// IsValidSibling (the only place GetInsertionPrevSibling might look at the
// passed in node itself) needs to resolve style on the node we record this and
// return that this range needs to be split up and inserted separately. Table
// captions need extra attention as we need to determine where to insert them
// in the caption list, while skipping any nodes in the range being inserted
// (because when we treat the caption frames the other nodes have had their
// frames constructed but not yet inserted into the frame tree).
nsresult
nsCSSFrameConstructor::ContentRangeInserted(nsIContent* aContainer,
nsIContent* aStartChild,
nsIContent* aEndChild,
nsILayoutHistoryState* aFrameState,
bool aAllowLazyConstruction)
{
AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
NS_PRECONDITION(mUpdateCount != 0,
"Should be in an update while creating frames");
NS_PRECONDITION(aStartChild, "must always pass a child");
// XXXldb Do we need to re-resolve style to handle the CSS2 + combinator and
// the :empty pseudo-class?
#ifdef DEBUG
if (gNoisyContentUpdates) {
printf("nsCSSFrameConstructor::ContentRangeInserted container=%p "
"start-child=%p end-child=%p lazy=%d\n",
static_cast<void*>(aContainer),
static_cast<void*>(aStartChild), static_cast<void*>(aEndChild),
aAllowLazyConstruction);
if (gReallyNoisyContentUpdates) {
if (aContainer) {
aContainer->List(stdout,0);
} else {
aStartChild->List(stdout, 0);
}
}
}
#endif
#ifdef DEBUG
for (nsIContent* child = aStartChild;
child != aEndChild;
child = child->GetNextSibling()) {
// XXX the GetContent() != child check is needed due to bug 135040.
// Remove it once that's fixed.
NS_ASSERTION(!child->GetPrimaryFrame() ||
child->GetPrimaryFrame()->GetContent() != child,
"asked to construct a frame for a node that already has a frame");
}
#endif
bool isSingleInsert = (aStartChild->GetNextSibling() == aEndChild);
NS_ASSERTION(isSingleInsert || !aAllowLazyConstruction,
"range insert shouldn't be lazy");
NS_ASSERTION(isSingleInsert || aEndChild,
"range should not include all nodes after aStartChild");
#ifdef MOZ_XUL
if (aContainer && IsXULListBox(aContainer)) {
if (isSingleInsert) {
if (NotifyListBoxBody(mPresShell->GetPresContext(), aContainer,
// The insert case in NotifyListBoxBody
// doesn't use "old next sibling".
aStartChild, nullptr,
mDocument, nullptr, CONTENT_INSERTED)) {
return NS_OK;
}
} else {
// We don't handle a range insert to a listbox parent, issue single
// ContertInserted calls for each node inserted.
LAYOUT_PHASE_TEMP_EXIT();
IssueSingleInsertNofications(aContainer, aStartChild, aEndChild,
aAllowLazyConstruction);
LAYOUT_PHASE_TEMP_REENTER();
return NS_OK;
}
}
#endif // MOZ_XUL
// If we have a null parent, then this must be the document element being
// inserted, or some other child of the document in the DOM (might be a PI,
// say).
if (! aContainer) {
NS_ASSERTION(isSingleInsert,
"root node insertion should be a single insertion");
Element *docElement = mDocument->GetRootElement();
if (aStartChild != docElement) {
// Not the root element; just bail out
return NS_OK;
}
NS_PRECONDITION(nullptr == mRootElementFrame,
"root element frame already created");
// Create frames for the document element and its child elements
nsIFrame* docElementFrame =
ConstructDocElementFrame(docElement, aFrameState);
if (docElementFrame) {
InvalidateCanvasIfNeeded(mPresShell, aStartChild);
#ifdef DEBUG
if (gReallyNoisyContentUpdates) {
printf("nsCSSFrameConstructor::ContentRangeInserted: resulting frame "
"model:\n");
mFixedContainingBlock->List(stdout, 0);
}
#endif
}
if (aFrameState) {
// Restore frame state for the root scroll frame if there is one
nsIFrame* rootScrollFrame = mPresShell->GetRootScrollFrame();
if (rootScrollFrame) {
RestoreFrameStateFor(rootScrollFrame, aFrameState);
}
}
#ifdef ACCESSIBILITY
nsAccessibilityService* accService = nsIPresShell::AccService();
if (accService) {
accService->ContentRangeInserted(mPresShell, aContainer,
aStartChild, aEndChild);
}
#endif
return NS_OK;
}
nsIFrame* parentFrame = GetFrameFor(aContainer);
// The xbl:children element won't have a frame, but default content can have the children as
// a parent. While its uncommon to change the structure of the default content itself, a label,
// for example, can be reframed by having its value attribute set or removed.
if (!parentFrame && !aContainer->IsActiveChildrenElement()) {
return NS_OK;
}
// Otherwise, we've got parent content. Find its frame.
NS_ASSERTION(!parentFrame || parentFrame->GetContent() == aContainer, "New XBL code is possibly wrong!");
if (aAllowLazyConstruction &&
MaybeConstructLazily(CONTENTINSERT, aContainer, aStartChild)) {
return NS_OK;
}
if (isSingleInsert) {
// See if we have an XBL insertion point. If so, then that's our
// real parent frame; if not, then the frame hasn't been built yet
// and we just bail.
parentFrame = GetInsertionPoint(aContainer, aStartChild);
} else {
// Get our insertion point. If we need to issue single ContentInserted's
// GetRangeInsertionPoint will take care of that for us.
LAYOUT_PHASE_TEMP_EXIT();
parentFrame = GetRangeInsertionPoint(aContainer, aStartChild, aEndChild,
aAllowLazyConstruction);
LAYOUT_PHASE_TEMP_REENTER();
}
if (!parentFrame) {
return NS_OK;
}
bool isAppend, isRangeInsertSafe;
nsIFrame* prevSibling =
GetInsertionPrevSibling(parentFrame, aContainer, aStartChild,
&isAppend, &isRangeInsertSafe);
// check if range insert is safe
if (!isSingleInsert && !isRangeInsertSafe) {
// must fall back to a single ContertInserted for each child in the range
LAYOUT_PHASE_TEMP_EXIT();
IssueSingleInsertNofications(aContainer, aStartChild, aEndChild,
aAllowLazyConstruction);
LAYOUT_PHASE_TEMP_REENTER();
return NS_OK;
}
nsIContent* container = parentFrame->GetContent();
nsIAtom* frameType = parentFrame->GetType();
LAYOUT_PHASE_TEMP_EXIT();
if (MaybeRecreateForFrameset(parentFrame, aStartChild, aEndChild)) {
LAYOUT_PHASE_TEMP_REENTER();
return NS_OK;
}
LAYOUT_PHASE_TEMP_REENTER();
// We should only get here with fieldsets when doing a single insert, because
// fieldsets have multiple insertion points.
NS_ASSERTION(isSingleInsert || frameType != nsGkAtoms::fieldSetFrame,
"Unexpected parent");
if (frameType == nsGkAtoms::fieldSetFrame &&
aStartChild->Tag() == nsGkAtoms::legend) {
// Just reframe the parent, since figuring out whether this
// should be the new legend and then handling it is too complex.
// We could do a little better here --- check if the fieldset already
// has a legend which occurs earlier in its child list than this node,
// and if so, proceed. But we'd have to extend nsFieldSetFrame
// to locate this legend in the inserted frames and extract it.
LAYOUT_PHASE_TEMP_EXIT();
nsresult rv = RecreateFramesForContent(parentFrame->GetContent(), false);
LAYOUT_PHASE_TEMP_REENTER();
return rv;
}
// Don't construct kids of leaves
if (parentFrame->IsLeaf()) {
// Clear lazy bits so we don't try to construct again.
ClearLazyBits(aStartChild, aEndChild);
return NS_OK;
}
if (parentFrame->IsFrameOfType(nsIFrame::eMathML)) {
LAYOUT_PHASE_TEMP_EXIT();
nsresult rv = RecreateFramesForContent(parentFrame->GetContent(), false);
LAYOUT_PHASE_TEMP_REENTER();
return rv;
}
nsFrameConstructorState state(mPresShell,
GetAbsoluteContainingBlock(parentFrame, FIXED_POS),
GetAbsoluteContainingBlock(parentFrame, ABS_POS),
GetFloatContainingBlock(parentFrame),
aFrameState);
state.mTreeMatchContext.InitAncestors(aContainer ?
aContainer->AsElement() :
nullptr);
// Recover state for the containing block - we need to know if
// it has :first-letter or :first-line style applied to it. The
// reason we care is that the internal structure in these cases
// is not the normal structure and requires custom updating
// logic.
nsIFrame* containingBlock = state.mFloatedItems.containingBlock;
bool haveFirstLetterStyle = false;
bool haveFirstLineStyle = false;
// In order to shave off some cycles, we only dig up the
// containing block haveFirst* flags if the parent frame where
// the insertion/append is occurring is an inline or block
// container. For other types of containers this isn't relevant.
uint8_t parentDisplay = parentFrame->GetDisplay();
// Examine the parentFrame where the insertion is taking
// place. If it's a certain kind of container then some special
// processing is done.
if ((NS_STYLE_DISPLAY_BLOCK == parentDisplay) ||
(NS_STYLE_DISPLAY_LIST_ITEM == parentDisplay) ||
(NS_STYLE_DISPLAY_INLINE == parentDisplay) ||
(NS_STYLE_DISPLAY_INLINE_BLOCK == parentDisplay)) {
// Recover the special style flags for the containing block
if (containingBlock) {
haveFirstLetterStyle = HasFirstLetterStyle(containingBlock);
haveFirstLineStyle =
ShouldHaveFirstLineStyle(containingBlock->GetContent(),
containingBlock->StyleContext());
}
if (haveFirstLetterStyle) {
// If our current parentFrame is a Letter frame, use its parent as our
// new parent hint
if (parentFrame->GetType() == nsGkAtoms::letterFrame) {
// If parentFrame is out of flow, then we actually want the parent of
// the placeholder frame.
if (parentFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
nsPlaceholderFrame* placeholderFrame =
GetPlaceholderFrameFor(parentFrame);
NS_ASSERTION(placeholderFrame, "No placeholder for out-of-flow?");
parentFrame = placeholderFrame->GetParent();
} else {
parentFrame = parentFrame->GetParent();
}
}
// Remove the old letter frames before doing the insertion
RemoveLetterFrames(state.mPresContext, mPresShell,
state.mFloatedItems.containingBlock);
// Removing the letterframes messes around with the frame tree, removing
// and creating frames. We need to reget our prevsibling, parent frame,
// etc.
prevSibling = GetInsertionPrevSibling(parentFrame, aContainer,
aStartChild, &isAppend,
&isRangeInsertSafe);
// Need check whether a range insert is still safe.
if (!isSingleInsert && !isRangeInsertSafe) {
// Need to recover the letter frames first.
RecoverLetterFrames(state.mFloatedItems.containingBlock);
// must fall back to a single ContertInserted for each child in the range
LAYOUT_PHASE_TEMP_EXIT();
IssueSingleInsertNofications(aContainer, aStartChild, aEndChild,
aAllowLazyConstruction);
LAYOUT_PHASE_TEMP_REENTER();
return NS_OK;
}
container = parentFrame->GetContent();
frameType = parentFrame->GetType();
}
}
if (!prevSibling) {
// We're inserting the new frames as the first child. See if the
// parent has a :before pseudo-element
nsIFrame* firstChild = parentFrame->GetFirstPrincipalChild();
if (firstChild &&
nsLayoutUtils::IsGeneratedContentFor(container, firstChild,
nsCSSPseudoElements::before)) {
// Insert the new frames after the last continuation of the :before
prevSibling = firstChild->GetTailContinuation();
parentFrame = prevSibling->GetParent()->GetContentInsertionFrame();
// Don't change isAppend here; we'll can call AppendFrames as needed, and
// the change to our prevSibling doesn't affect that.
}
}
FrameConstructionItemList items;
ParentType parentType = GetParentType(frameType);
FlattenedChildIterator iter(aContainer);
bool haveNoXBLChildren = (!iter.XBLInvolved() || !iter.GetNextChild());
if (aStartChild->GetPreviousSibling() &&
parentType == eTypeBlock && haveNoXBLChildren) {
// If there's a text node in the normal content list just before the
// new nodes, and it has no frame, make a frame construction item for
// it, because it might need a frame now. No need to do this if our
// parent type is not block, though, since WipeContainingBlock
// already handles that sitation.
AddTextItemIfNeeded(state, parentFrame, aStartChild->GetPreviousSibling(),
items);
}
if (isSingleInsert) {
AddFrameConstructionItems(state, aStartChild,
aStartChild->IsRootOfAnonymousSubtree(),
parentFrame, items);
} else {
for (nsIContent* child = aStartChild;
child != aEndChild;
child = child->GetNextSibling()){
AddFrameConstructionItems(state, child, false, parentFrame, items);
}
}
if (aEndChild && parentType == eTypeBlock && haveNoXBLChildren) {
// If there's a text node in the normal content list just after the
// new nodes, and it has no frame, make a frame construction item for
// it, because it might need a frame now. No need to do this if our
// parent type is not block, though, since WipeContainingBlock
// already handles that sitation.
AddTextItemIfNeeded(state, parentFrame, aEndChild, items);
}
// Perform special check for diddling around with the frames in
// a special inline frame.
// If we're appending before :after content, then we're not really
// appending, so let WipeContainingBlock know that.
LAYOUT_PHASE_TEMP_EXIT();
if (WipeContainingBlock(state, containingBlock, parentFrame, items,
isAppend, prevSibling)) {
LAYOUT_PHASE_TEMP_REENTER();
return NS_OK;
}
LAYOUT_PHASE_TEMP_REENTER();
// If the container is a table and a caption will be appended, it needs to be
// put in the outer table frame's additional child list.
// We make no attempt here to set flags to indicate whether the list
// will be at the start or end of a block. It doesn't seem worthwhile.
nsFrameItems frameItems, captionItems;
ConstructFramesFromItemList(state, items, parentFrame, frameItems);
if (frameItems.NotEmpty()) {
for (nsIContent* child = aStartChild;
child != aEndChild;
child = child->GetNextSibling()){
InvalidateCanvasIfNeeded(mPresShell, child);
}
if (nsGkAtoms::tableFrame == frameType ||
nsGkAtoms::tableOuterFrame == frameType) {
PullOutCaptionFrames(frameItems, captionItems);
}
}
// If the parent of our current prevSibling is different from the frame we'll
// actually use as the parent, then the calculated insertion point is now
// invalid and as it is unknown where to insert correctly we append instead
// (bug 341858).
// This can affect our prevSibling and isAppend, but should not have any
// effect on the WipeContainingBlock above, since this should only happen
// when neither parent is a special frame and should not affect whitespace
// handling inside table-related frames (and in fact, can only happen when
// one of the parents is an outer table and one is an inner table or when the
// parent is a fieldset or fieldset content frame). So it won't affect the
// {ib} or XUL box cases in WipeContainingBlock(), and the table pseudo
// handling will only be affected by us maybe thinking we're not inserting
// at the beginning, whereas we really are. That would have made us reframe
// unnecessarily, but that's ok.
// XXXbz we should push our frame construction item code up higher, so we
// know what our items are by the time we start figuring out previous
// siblings
if (prevSibling && frameItems.NotEmpty() &&
frameItems.FirstChild()->GetParent() != prevSibling->GetParent()) {
#ifdef DEBUG
nsIFrame* frame1 = frameItems.FirstChild()->GetParent();
nsIFrame* frame2 = prevSibling->GetParent();
NS_ASSERTION(!IsFrameSpecial(frame1) && !IsFrameSpecial(frame2),
"Neither should be special");
NS_ASSERTION((frame1->GetType() == nsGkAtoms::tableFrame &&
frame2->GetType() == nsGkAtoms::tableOuterFrame) ||
(frame1->GetType() == nsGkAtoms::tableOuterFrame &&
frame2->GetType() == nsGkAtoms::tableFrame) ||
frame1->GetType() == nsGkAtoms::fieldSetFrame ||
(frame1->GetParent() &&
frame1->GetParent()->GetType() == nsGkAtoms::fieldSetFrame),
"Unexpected frame types");
#endif
isAppend = true;
nsIFrame* appendAfterFrame;
parentFrame =
::AdjustAppendParentForAfterContent(mPresShell->GetPresContext(),
container,
frameItems.FirstChild()->GetParent(),
&appendAfterFrame);
prevSibling = ::FindAppendPrevSibling(parentFrame, appendAfterFrame);
}
if (haveFirstLineStyle && parentFrame == containingBlock) {
// It's possible that the new frame goes into a first-line
// frame. Look at it and see...
if (isAppend) {
// Use append logic when appending
AppendFirstLineFrames(state, containingBlock->GetContent(),
containingBlock, frameItems);
}
else {
// Use more complicated insert logic when inserting
// XXXbz this method is a no-op, so it's easy for the args being passed
// here to make no sense without anyone noticing... If it ever stops
// being a no-op, vet them carefully!
InsertFirstLineFrames(state, container, containingBlock, &parentFrame,
prevSibling, frameItems);
}
}
// We might have captions; put them into the caption list of the
// outer table frame.
if (captionItems.NotEmpty()) {
NS_ASSERTION(nsGkAtoms::tableFrame == frameType ||
nsGkAtoms::tableOuterFrame == frameType,
"parent for caption is not table?");
// We need to determine where to put the caption items; start with the
// the parent frame that has already been determined and get the insertion
// prevsibling of the first caption item.
nsIFrame* captionParent = parentFrame;
bool captionIsAppend;
nsIFrame* captionPrevSibling = nullptr;
// aIsRangeInsertSafe is ignored on purpose because it is irrelevant here.
bool ignored;
if (isSingleInsert) {
captionPrevSibling =
GetInsertionPrevSibling(captionParent, aContainer, aStartChild,
&captionIsAppend, &ignored);
} else {
nsIContent* firstCaption = captionItems.FirstChild()->GetContent();
// It is very important here that we skip the children in
// [aStartChild,aEndChild) when looking for a
// prevsibling.
captionPrevSibling =
GetInsertionPrevSibling(captionParent, aContainer, firstCaption,
&captionIsAppend, &ignored,
aStartChild, aEndChild);
}
nsIFrame* outerTable = nullptr;
if (GetCaptionAdjustedParent(captionParent, captionItems.FirstChild(),
&outerTable)) {
// If the parent is not an outer table frame we will try to add frames
// to a named child list that the parent does not honour and the frames
// will get lost
NS_ASSERTION(nsGkAtoms::tableOuterFrame == outerTable->GetType(),
"Pseudo frame construction failure; "
"a caption can be only a child of an outer table frame");
// If the parent of our current prevSibling is different from the frame
// we'll actually use as the parent, then the calculated insertion
// point is now invalid (bug 341382).
if (captionPrevSibling &&
captionPrevSibling->GetParent() != outerTable) {
captionPrevSibling = nullptr;
}
if (captionIsAppend) {
AppendFrames(outerTable, nsIFrame::kCaptionList, captionItems);
} else {
InsertFrames(outerTable, nsIFrame::kCaptionList,
captionPrevSibling, captionItems);
}
}
}
if (frameItems.NotEmpty()) {
// Notify the parent frame
if (isAppend) {
AppendFramesToParent(state, parentFrame, frameItems, prevSibling);
} else {
InsertFrames(parentFrame, kPrincipalList, prevSibling, frameItems);
}
}
if (haveFirstLetterStyle) {
// Recover the letter frames for the containing block when
// it has first-letter style.
RecoverLetterFrames(state.mFloatedItems.containingBlock);
}
#ifdef DEBUG
if (gReallyNoisyContentUpdates && parentFrame) {
printf("nsCSSFrameConstructor::ContentRangeInserted: resulting frame model:\n");
parentFrame->List(stdout, 0);
}
#endif
#ifdef ACCESSIBILITY
nsAccessibilityService* accService = nsIPresShell::AccService();
if (accService) {
accService->ContentRangeInserted(mPresShell, aContainer,
aStartChild, aEndChild);
}
#endif
return NS_OK;
}
nsresult
nsCSSFrameConstructor::ContentRemoved(nsIContent* aContainer,
nsIContent* aChild,
nsIContent* aOldNextSibling,
RemoveFlags aFlags,
bool* aDidReconstruct)
{
AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
NS_PRECONDITION(mUpdateCount != 0,
"Should be in an update while destroying frames");
*aDidReconstruct = false;
// XXXldb Do we need to re-resolve style to handle the CSS2 + combinator and
// the :empty pseudo-class?
#ifdef DEBUG
if (gNoisyContentUpdates) {
printf("nsCSSFrameConstructor::ContentRemoved container=%p child=%p "
"old-next-sibling=%p\n",
static_cast<void*>(aContainer),
static_cast<void*>(aChild),
static_cast<void*>(aOldNextSibling));
if (gReallyNoisyContentUpdates) {
aContainer->List(stdout, 0);
}
}
#endif
nsPresContext *presContext = mPresShell->GetPresContext();
nsresult rv = NS_OK;
// Find the child frame that maps the content
nsIFrame* childFrame = aChild->GetPrimaryFrame();
if (!childFrame || childFrame->GetContent() != aChild) {
// XXXbz the GetContent() != aChild check is needed due to bug 135040.
// Remove it once that's fixed.
ClearUndisplayedContentIn(aChild, aContainer);
}
#ifdef MOZ_XUL
if (NotifyListBoxBody(presContext, aContainer, aChild, aOldNextSibling,
mDocument, childFrame, CONTENT_REMOVED))
return NS_OK;
#endif // MOZ_XUL
// If we're removing the root, then make sure to remove things starting at
// the viewport's child instead of the primary frame (which might even be
// null if the root had an XBL binding or display:none, even though the
// frames above it got created). We do the adjustment after the childFrame
// check above, because we do want to clear any undisplayed content we might
// have for the root. Detecting removal of a root is a little exciting; in
// particular, having a null aContainer is necessary but NOT sufficient. Due
// to how we process reframes, the content node might not even be in our
// document by now. So explicitly check whether the viewport's first kid's
// content node is aChild.
bool isRoot = false;
if (!aContainer) {
nsIFrame* viewport = GetRootFrame();
if (viewport) {
nsIFrame* firstChild = viewport->GetFirstPrincipalChild();
if (firstChild && firstChild->GetContent() == aChild) {
isRoot = true;
childFrame = firstChild;
NS_ASSERTION(!childFrame->GetNextSibling(), "How did that happen?");
}
}
}
if (childFrame) {
InvalidateCanvasIfNeeded(mPresShell, aChild);
// See whether we need to remove more than just childFrame
LAYOUT_PHASE_TEMP_EXIT();
if (MaybeRecreateContainerForFrameRemoval(childFrame, &rv)) {
LAYOUT_PHASE_TEMP_REENTER();
*aDidReconstruct = true;
return rv;
}
LAYOUT_PHASE_TEMP_REENTER();
// Get the childFrame's parent frame
nsIFrame* parentFrame = childFrame->GetParent();
nsIAtom* parentType = parentFrame->GetType();
if (parentType == nsGkAtoms::frameSetFrame &&
IsSpecialFramesetChild(aChild)) {
// Just reframe the parent, since framesets are weird like that.
*aDidReconstruct = true;
LAYOUT_PHASE_TEMP_EXIT();
nsresult rv = RecreateFramesForContent(parentFrame->GetContent(), false);
LAYOUT_PHASE_TEMP_REENTER();
return rv;
}
// If we're a child of MathML, then we should reframe the MathML content.
// If we're non-MathML, then we would be wrapped in a block so we need to
// check our grandparent in that case.
nsIFrame* possibleMathMLAncestor = parentType == nsGkAtoms::blockFrame ?
parentFrame->GetParent() : parentFrame;
if (possibleMathMLAncestor->IsFrameOfType(nsIFrame::eMathML)) {
*aDidReconstruct = true;
LAYOUT_PHASE_TEMP_EXIT();
nsresult rv = RecreateFramesForContent(possibleMathMLAncestor->GetContent(), false);
LAYOUT_PHASE_TEMP_REENTER();
return rv;
}
// Undo XUL wrapping if it's no longer needed.
// (If we're in the XUL block-wrapping situation, parentFrame is the
// wrapper frame.)
nsIFrame* grandparentFrame = parentFrame->GetParent();
if (grandparentFrame && grandparentFrame->IsBoxFrame() &&
(grandparentFrame->GetStateBits() & NS_STATE_BOX_WRAPS_KIDS_IN_BLOCK) &&
// check if this frame is the only one needing wrapping
aChild == AnyKidsNeedBlockParent(parentFrame->GetFirstPrincipalChild()) &&
!AnyKidsNeedBlockParent(childFrame->GetNextSibling())) {
*aDidReconstruct = true;
LAYOUT_PHASE_TEMP_EXIT();
nsresult rv = RecreateFramesForContent(grandparentFrame->GetContent(), true);
LAYOUT_PHASE_TEMP_REENTER();
return rv;
}
#ifdef ACCESSIBILITY
nsAccessibilityService* accService = nsIPresShell::AccService();
if (accService) {
accService->ContentRemoved(mPresShell, aContainer, aChild);
}
#endif
// Examine the containing-block for the removed content and see if
// :first-letter style applies.
nsIFrame* inflowChild = childFrame;
if (childFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
inflowChild = GetPlaceholderFrameFor(childFrame);
NS_ASSERTION(inflowChild, "No placeholder for out-of-flow?");
}
nsIFrame* containingBlock =
GetFloatContainingBlock(inflowChild->GetParent());
bool haveFLS = containingBlock && HasFirstLetterStyle(containingBlock);
if (haveFLS) {
// Trap out to special routine that handles adjusting a blocks
// frame tree when first-letter style is present.
#ifdef NOISY_FIRST_LETTER
printf("ContentRemoved: containingBlock=");
nsFrame::ListTag(stdout, containingBlock);
printf(" parentFrame=");
nsFrame::ListTag(stdout, parentFrame);
printf(" childFrame=");
nsFrame::ListTag(stdout, childFrame);
printf("\n");
#endif
// First update the containing blocks structure by removing the
// existing letter frames. This makes the subsequent logic
// simpler.
RemoveLetterFrames(presContext, mPresShell, containingBlock);
// Recover childFrame and parentFrame
childFrame = aChild->GetPrimaryFrame();
if (!childFrame || childFrame->GetContent() != aChild) {
// XXXbz the GetContent() != aChild check is needed due to bug 135040.
// Remove it once that's fixed.
ClearUndisplayedContentIn(aChild, aContainer);
return NS_OK;
}
parentFrame = childFrame->GetParent();
parentType = parentFrame->GetType();
#ifdef NOISY_FIRST_LETTER
printf(" ==> revised parentFrame=");
nsFrame::ListTag(stdout, parentFrame);
printf(" childFrame=");
nsFrame::ListTag(stdout, childFrame);
printf("\n");
#endif
}
#ifdef DEBUG
if (gReallyNoisyContentUpdates) {
printf("nsCSSFrameConstructor::ContentRemoved: childFrame=");
nsFrame::ListTag(stdout, childFrame);
putchar('\n');
parentFrame->List(stdout, 0);
}
#endif
// Notify the parent frame that it should delete the frame
if (childFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
childFrame = GetPlaceholderFrameFor(childFrame);
NS_ASSERTION(childFrame, "Missing placeholder frame for out of flow.");
parentFrame = childFrame->GetParent();
}
rv = RemoveFrame(nsLayoutUtils::GetChildListNameFor(childFrame),
childFrame);
//XXXfr NS_ENSURE_SUCCESS(rv, rv) ?
if (isRoot) {
mRootElementFrame = nullptr;
mRootElementStyleFrame = nullptr;
mDocElementContainingBlock = nullptr;
mPageSequenceFrame = nullptr;
mGfxScrollFrame = nullptr;
mHasRootAbsPosContainingBlock = false;
mFixedContainingBlock = GetRootFrame();
}
if (haveFLS && mRootElementFrame) {
RecoverLetterFrames(containingBlock);
}
// If we're just reconstructing frames for the element, then the
// following ContentInserted notification on the element will
// take care of fixing up any adjacent text nodes. We don't need
// to do this if the table parent type of our parent type is not
// eTypeBlock, though, because in that case the whitespace isn't
// being suppressed due to us anyway.
if (aContainer && !aChild->IsRootOfAnonymousSubtree() &&
aFlags != REMOVE_FOR_RECONSTRUCTION &&
GetParentType(parentType) == eTypeBlock) {
// Adjacent whitespace-only text nodes might have been suppressed if
// this node does not have inline ends. Create frames for them now
// if necessary.
// Reframe any text node just before the node being removed, if there is
// one, and if it's not the last child or the first child. If a whitespace
// textframe was being suppressed and it's now the last child or first
// child then it can stay suppressed since the parent must be a block
// and hence it's adjacent to a block end.
// If aOldNextSibling is null, then the text node before the node being
// removed is the last node, and we don't need to worry about it.
if (aOldNextSibling) {
nsIContent* prevSibling = aOldNextSibling->GetPreviousSibling();
if (prevSibling && prevSibling->GetPreviousSibling()) {
LAYOUT_PHASE_TEMP_EXIT();
ReframeTextIfNeeded(aContainer, prevSibling);
LAYOUT_PHASE_TEMP_REENTER();
}
}
// Reframe any text node just after the node being removed, if there is
// one, and if it's not the last child or the first child.
if (aOldNextSibling && aOldNextSibling->GetNextSibling() &&
aOldNextSibling->GetPreviousSibling()) {
LAYOUT_PHASE_TEMP_EXIT();
ReframeTextIfNeeded(aContainer, aOldNextSibling);
LAYOUT_PHASE_TEMP_REENTER();
}
}
#ifdef DEBUG
if (gReallyNoisyContentUpdates && parentFrame) {
printf("nsCSSFrameConstructor::ContentRemoved: resulting frame model:\n");
parentFrame->List(stdout, 0);
}
#endif
}
return rv;
}
/**
* This method invalidates the canvas when frames are removed or added for a
* node that might have its background propagated to the canvas, i.e., a
* document root node or an HTML BODY which is a child of the root node.
*
* @param aFrame a frame for a content node about to be removed or a frame that
* was just created for a content node that was inserted.
*/
static void
InvalidateCanvasIfNeeded(nsIPresShell* presShell, nsIContent* node)
{
NS_PRECONDITION(presShell->GetRootFrame(), "What happened here?");
NS_PRECONDITION(presShell->GetPresContext(), "Say what?");
// Note that both in ContentRemoved and ContentInserted the content node
// will still have the right parent pointer, so looking at that is ok.
nsIContent* parent = node->GetParent();
if (parent) {
// Has a parent; might not be what we want
nsIContent* grandParent = parent->GetParent();
if (grandParent) {
// Has a grandparent, so not what we want
return;
}
// Check whether it's an HTML body
if (node->Tag() != nsGkAtoms::body ||
!node->IsHTML()) {
return;
}
}
// At this point the node has no parent or it's an HTML <body> child of the
// root. We might not need to invalidate in this case (eg we might be in
// XHTML or something), but chances are we want to. Play it safe.
// Invalidate the viewport.
nsIFrame* rootFrame = presShell->GetRootFrame();
rootFrame->InvalidateFrameSubtree();
}
nsIFrame*
nsCSSFrameConstructor::EnsureFrameForTextNode(nsGenericDOMDataNode* aContent)
{
if (aContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE) &&
!aContent->HasFlag(NS_CREATE_FRAME_FOR_IGNORABLE_WHITESPACE)) {
// Text frame may have been suppressed. Disable suppression and signal
// that a flush should be performed.
aContent->SetFlags(NS_CREATE_FRAME_FOR_IGNORABLE_WHITESPACE);
nsAutoScriptBlocker blocker;
BeginUpdate();
RecreateFramesForContent(aContent, false);
EndUpdate();
}
return aContent->GetPrimaryFrame();
}
nsresult
nsCSSFrameConstructor::CharacterDataChanged(nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
nsresult rv = NS_OK;
if ((aContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE) &&
!aContent->TextIsOnlyWhitespace()) ||
(aContent->HasFlag(NS_REFRAME_IF_WHITESPACE) &&
aContent->TextIsOnlyWhitespace())) {
#ifdef DEBUG
nsIFrame* frame = aContent->GetPrimaryFrame();
NS_ASSERTION(!frame || !frame->IsGeneratedContentFrame(),
"Bit should never be set on generated content");
#endif
LAYOUT_PHASE_TEMP_EXIT();
nsresult rv = RecreateFramesForContent(aContent, false);
LAYOUT_PHASE_TEMP_REENTER();
return rv;
}
// Find the child frame
nsIFrame* frame = aContent->GetPrimaryFrame();
// Notify the first frame that maps the content. It will generate a reflow
// command
// It's possible the frame whose content changed isn't inserted into the
// frame hierarchy yet, or that there is no frame that maps the content
if (nullptr != frame) {
#if 0
NS_FRAME_LOG(NS_FRAME_TRACE_CALLS,
("nsCSSFrameConstructor::CharacterDataChanged: content=%p[%s] subcontent=%p frame=%p",
aContent, ContentTag(aContent, 0),
aSubContent, frame));
#endif
// Special check for text content that is a child of a letter frame. If
// this happens, we should remove the letter frame, do whatever we're
// planning to do with this notification, then put the letter frame back.
// Note that this is basically what RecreateFramesForContent ends up doing;
// the reason we dont' want to call that here is that our text content
// could be native anonymous, in which case RecreateFramesForContent would
// completely barf on it. And recreating the non-anonymous ancestor would
// just lead us to come back into this notification (e.g. if quotes or
// counters are involved), leading to a loop.
nsIFrame* block = GetFloatContainingBlock(frame);
bool haveFirstLetterStyle = false;
if (block) {
// See if the block has first-letter style applied to it.
haveFirstLetterStyle = HasFirstLetterStyle(block);
if (haveFirstLetterStyle) {
RemoveLetterFrames(mPresShell->GetPresContext(), mPresShell,
block);
// Reget |frame|, since we might have killed it.
// Do we really need to call CharacterDataChanged in this case, though?
frame = aContent->GetPrimaryFrame();
NS_ASSERTION(frame, "Should have frame here!");
}
}
frame->CharacterDataChanged(aInfo);
if (haveFirstLetterStyle) {
RecoverLetterFrames(block);
}
}
return rv;
}
void
nsCSSFrameConstructor::BeginUpdate() {
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"Someone forgot a script blocker");
nsRootPresContext* rootPresContext =
mPresShell->GetPresContext()->GetRootPresContext();
if (rootPresContext) {
rootPresContext->IncrementDOMGeneration();
}
++sGlobalGenerationNumber;
++mUpdateCount;
}
void
nsCSSFrameConstructor::EndUpdate()
{
if (mUpdateCount == 1) {
// This is the end of our last update. Before we decrement
// mUpdateCount, recalc quotes and counters as needed.
RecalcQuotesAndCounters();
NS_ASSERTION(mUpdateCount == 1, "Odd update count");
}
NS_ASSERTION(mUpdateCount, "Negative mUpdateCount!");
--mUpdateCount;
}
void
nsCSSFrameConstructor::RecalcQuotesAndCounters()
{
if (mQuotesDirty) {
mQuotesDirty = false;
mQuoteList.RecalcAll();
}
if (mCountersDirty) {
mCountersDirty = false;
mCounterManager.RecalcAll();
}
NS_ASSERTION(!mQuotesDirty, "Quotes updates will be lost");
NS_ASSERTION(!mCountersDirty, "Counter updates will be lost");
}
void
nsCSSFrameConstructor::WillDestroyFrameTree()
{
#if defined(DEBUG_dbaron_off)
mCounterManager.Dump();
#endif
mIsDestroyingFrameTree = true;
// Prevent frame tree destruction from being O(N^2)
mQuoteList.Clear();
mCounterManager.Clear();
// Remove our presshell as a style flush observer. But leave
// RestyleManager::mObservingRefreshDriver true so we don't readd to
// it even if someone tries to post restyle events on us from this
// point on for some reason.
mPresShell->GetPresContext()->RefreshDriver()->
RemoveStyleFlushObserver(mPresShell);
nsFrameManager::Destroy();
}
//STATIC
// XXXbz I'd really like this method to go away. Once we have inline-block and
// I can just use that for sized broken images, that can happen, maybe.
void nsCSSFrameConstructor::GetAlternateTextFor(nsIContent* aContent,
nsIAtom* aTag, // content object's tag
nsXPIDLString& aAltText)
{
// The "alt" attribute specifies alternate text that is rendered
// when the image can not be displayed
// If there's no "alt" attribute, and aContent is an input
// element, then use the value of the "value" attribute
if (!aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::alt, aAltText) &&
nsGkAtoms::input == aTag) {
// If there's no "value" attribute either, then use the localized string
// for "Submit" as the alternate text.
if (!aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::value, aAltText)) {
nsContentUtils::GetLocalizedString(nsContentUtils::eFORMS_PROPERTIES,
"Submit", aAltText);
}
}
}
nsIFrame*
nsCSSFrameConstructor::CreateContinuingOuterTableFrame(nsIPresShell* aPresShell,
nsPresContext* aPresContext,
nsIFrame* aFrame,
nsIFrame* aParentFrame,
nsIContent* aContent,
nsStyleContext* aStyleContext)
{
nsIFrame* newFrame = NS_NewTableOuterFrame(aPresShell, aStyleContext);
newFrame->Init(aContent, aParentFrame, aFrame);
// Create a continuing inner table frame, and if there's a caption then
// replicate the caption
nsFrameItems newChildFrames;
nsIFrame* childFrame = aFrame->GetFirstPrincipalChild();
if (childFrame) {
nsIFrame* continuingTableFrame =
CreateContinuingFrame(aPresContext, childFrame, newFrame);
newChildFrames.AddChild(continuingTableFrame);
NS_ASSERTION(!childFrame->GetNextSibling(),"there can be only one inner table frame");
}
// Set the outer table's initial child list
newFrame->SetInitialChildList(kPrincipalList, newChildFrames);
return newFrame;
}
nsIFrame*
nsCSSFrameConstructor::CreateContinuingTableFrame(nsIPresShell* aPresShell,
nsPresContext* aPresContext,
nsIFrame* aFrame,
nsIFrame* aParentFrame,
nsIContent* aContent,
nsStyleContext* aStyleContext)
{
nsIFrame* newFrame = NS_NewTableFrame(aPresShell, aStyleContext);
newFrame->Init(aContent, aParentFrame, aFrame);
// Replicate any header/footer frames
nsFrameItems childFrames;
nsIFrame* childFrame = aFrame->GetFirstPrincipalChild();
for ( ; childFrame; childFrame = childFrame->GetNextSibling()) {
// See if it's a header/footer, possibly wrapped in a scroll frame.
nsTableRowGroupFrame* rowGroupFrame =
static_cast<nsTableRowGroupFrame*>(childFrame);
// If the row group was continued, then don't replicate it.
nsIFrame* rgNextInFlow = rowGroupFrame->GetNextInFlow();
if (rgNextInFlow) {
rowGroupFrame->SetRepeatable(false);
}
else if (rowGroupFrame->IsRepeatable()) {
// Replicate the header/footer frame.
nsTableRowGroupFrame* headerFooterFrame;
nsFrameItems childItems;
nsFrameConstructorState state(mPresShell,
GetAbsoluteContainingBlock(newFrame, FIXED_POS),
GetAbsoluteContainingBlock(newFrame, ABS_POS),
nullptr);
state.mCreatingExtraFrames = true;
headerFooterFrame = static_cast<nsTableRowGroupFrame*>
(NS_NewTableRowGroupFrame(aPresShell, rowGroupFrame->StyleContext()));
nsIContent* headerFooter = rowGroupFrame->GetContent();
headerFooterFrame->Init(headerFooter, newFrame, nullptr);
ProcessChildren(state, headerFooter, rowGroupFrame->StyleContext(),
headerFooterFrame, true, childItems, false,
nullptr);
NS_ASSERTION(state.mFloatedItems.IsEmpty(), "unexpected floated element");
headerFooterFrame->SetInitialChildList(kPrincipalList, childItems);
headerFooterFrame->SetRepeatable(true);
// Table specific initialization
headerFooterFrame->InitRepeatedFrame(aPresContext, rowGroupFrame);
// XXX Deal with absolute and fixed frames...
childFrames.AddChild(headerFooterFrame);
}
}
// Set the table frame's initial child list
newFrame->SetInitialChildList(kPrincipalList, childFrames);
return newFrame;
}
nsIFrame*
nsCSSFrameConstructor::CreateContinuingFrame(nsPresContext* aPresContext,
nsIFrame* aFrame,
nsIFrame* aParentFrame,
bool aIsFluid)
{
nsIPresShell* shell = aPresContext->PresShell();
nsStyleContext* styleContext = aFrame->StyleContext();
nsIFrame* newFrame = nullptr;
nsIFrame* nextContinuation = aFrame->GetNextContinuation();
nsIFrame* nextInFlow = aFrame->GetNextInFlow();
// Use the frame type to determine what type of frame to create
nsIAtom* frameType = aFrame->GetType();
nsIContent* content = aFrame->GetContent();
NS_ASSERTION(aFrame->GetSplittableType() != NS_FRAME_NOT_SPLITTABLE,
"why CreateContinuingFrame for a non-splittable frame?");
if (nsGkAtoms::textFrame == frameType) {
newFrame = NS_NewContinuingTextFrame(shell, styleContext);
newFrame->Init(content, aParentFrame, aFrame);
} else if (nsGkAtoms::inlineFrame == frameType) {
newFrame = NS_NewInlineFrame(shell, styleContext);
newFrame->Init(content, aParentFrame, aFrame);
} else if (nsGkAtoms::blockFrame == frameType) {
newFrame = NS_NewBlockFrame(shell, styleContext);
newFrame->Init(content, aParentFrame, aFrame);
#ifdef MOZ_XUL
} else if (nsGkAtoms::XULLabelFrame == frameType) {
newFrame = NS_NewXULLabelFrame(shell, styleContext);
newFrame->Init(content, aParentFrame, aFrame);
#endif
} else if (nsGkAtoms::columnSetFrame == frameType) {
newFrame = NS_NewColumnSetFrame(shell, styleContext, 0);
newFrame->Init(content, aParentFrame, aFrame);
} else if (nsGkAtoms::pageFrame == frameType) {
nsIFrame* canvasFrame;
newFrame = ConstructPageFrame(shell, aPresContext, aParentFrame, aFrame,
canvasFrame);
} else if (nsGkAtoms::tableOuterFrame == frameType) {
newFrame =
CreateContinuingOuterTableFrame(shell, aPresContext, aFrame, aParentFrame,
content, styleContext);
} else if (nsGkAtoms::tableFrame == frameType) {
newFrame =
CreateContinuingTableFrame(shell, aPresContext, aFrame, aParentFrame,
content, styleContext);
} else if (nsGkAtoms::tableRowGroupFrame == frameType) {
newFrame = NS_NewTableRowGroupFrame(shell, styleContext);
newFrame->Init(content, aParentFrame, aFrame);
} else if (nsGkAtoms::tableRowFrame == frameType) {
newFrame = NS_NewTableRowFrame(shell, styleContext);
newFrame->Init(content, aParentFrame, aFrame);
// Create a continuing frame for each table cell frame
nsFrameItems newChildList;
nsIFrame* cellFrame = aFrame->GetFirstPrincipalChild();
while (cellFrame) {
// See if it's a table cell frame
if (IS_TABLE_CELL(cellFrame->GetType())) {
nsIFrame* continuingCellFrame =
CreateContinuingFrame(aPresContext, cellFrame, newFrame);
newChildList.AddChild(continuingCellFrame);
}
cellFrame = cellFrame->GetNextSibling();
}
// Set the table cell's initial child list
newFrame->SetInitialChildList(kPrincipalList, newChildList);
} else if (IS_TABLE_CELL(frameType)) {
// Warning: If you change this and add a wrapper frame around table cell
// frames, make sure Bug 368554 doesn't regress!
// See IsInAutoWidthTableCellForQuirk() in nsImageFrame.cpp.
newFrame = NS_NewTableCellFrame(shell, styleContext, IsBorderCollapse(aParentFrame));
newFrame->Init(content, aParentFrame, aFrame);
// Create a continuing area frame
nsIFrame* blockFrame = aFrame->GetFirstPrincipalChild();
nsIFrame* continuingBlockFrame =
CreateContinuingFrame(aPresContext, blockFrame, newFrame);
// Set the table cell's initial child list
SetInitialSingleChild(newFrame, continuingBlockFrame);
} else if (nsGkAtoms::lineFrame == frameType) {
newFrame = NS_NewFirstLineFrame(shell, styleContext);
newFrame->Init(content, aParentFrame, aFrame);
} else if (nsGkAtoms::letterFrame == frameType) {
newFrame = NS_NewFirstLetterFrame(shell, styleContext);
newFrame->Init(content, aParentFrame, aFrame);
} else if (nsGkAtoms::imageFrame == frameType) {
newFrame = NS_NewImageFrame(shell, styleContext);
newFrame->Init(content, aParentFrame, aFrame);
} else if (nsGkAtoms::imageControlFrame == frameType) {
newFrame = NS_NewImageControlFrame(shell, styleContext);
newFrame->Init(content, aParentFrame, aFrame);
} else if (nsGkAtoms::placeholderFrame == frameType) {
// create a continuing out of flow frame
nsIFrame* oofFrame = nsPlaceholderFrame::GetRealFrameForPlaceholder(aFrame);
nsIFrame* oofContFrame =
CreateContinuingFrame(aPresContext, oofFrame, aParentFrame);
newFrame =
CreatePlaceholderFrameFor(shell, content, oofContFrame, styleContext,
aParentFrame, aFrame,
aFrame->GetStateBits() & PLACEHOLDER_TYPE_MASK);
} else if (nsGkAtoms::fieldSetFrame == frameType) {
newFrame = NS_NewFieldSetFrame(shell, styleContext);
newFrame->Init(content, aParentFrame, aFrame);
// Create a continuing area frame
// XXXbz we really shouldn't have to do this by hand!
nsIFrame* blockFrame = GetFieldSetBlockFrame(aFrame);
if (blockFrame) {
nsIFrame* continuingBlockFrame =
CreateContinuingFrame(aPresContext, blockFrame, newFrame);
// Set the fieldset's initial child list
SetInitialSingleChild(newFrame, continuingBlockFrame);
} else {
MOZ_ASSERT(aFrame->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER,
"FieldSet block may only be null for overflow containers");
}
} else if (nsGkAtoms::legendFrame == frameType) {
newFrame = NS_NewLegendFrame(shell, styleContext);
newFrame->Init(content, aParentFrame, aFrame);
} else {
NS_RUNTIMEABORT("unexpected frame type");
}
// Init() set newFrame to be a fluid continuation of aFrame.
// If we want a non-fluid continuation, we need to call SetPrevContinuation()
// to reset NS_FRAME_IS_FLUID_CONTINUATION.
if (!aIsFluid) {
newFrame->SetPrevContinuation(aFrame);
}
// A continuation of generated content is also generated content
if (aFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT) {
newFrame->AddStateBits(NS_FRAME_GENERATED_CONTENT);
}
// A continuation of an out-of-flow is also an out-of-flow
if (aFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
newFrame->AddStateBits(NS_FRAME_OUT_OF_FLOW);
}
if (nextInFlow) {
nextInFlow->SetPrevInFlow(newFrame);
newFrame->SetNextInFlow(nextInFlow);
} else if (nextContinuation) {
nextContinuation->SetPrevContinuation(newFrame);
newFrame->SetNextContinuation(nextContinuation);
}
NS_POSTCONDITION(!newFrame->GetNextSibling(), "unexpected sibling");
return newFrame;
}
nsresult
nsCSSFrameConstructor::ReplicateFixedFrames(nsPageContentFrame* aParentFrame)
{
// Now deal with fixed-pos things.... They should appear on all pages,
// so we want to move over the placeholders when processing the child
// of the pageContentFrame.
nsIFrame* prevPageContentFrame = aParentFrame->GetPrevInFlow();
if (!prevPageContentFrame) {
return NS_OK;
}
nsIFrame* canvasFrame = aParentFrame->GetFirstPrincipalChild();
nsIFrame* prevCanvasFrame = prevPageContentFrame->GetFirstPrincipalChild();
if (!canvasFrame || !prevCanvasFrame) {
// document's root element frame missing
return NS_ERROR_UNEXPECTED;
}
nsFrameItems fixedPlaceholders;
nsIFrame* firstFixed = prevPageContentFrame->GetFirstChild(nsIFrame::kFixedList);
if (!firstFixed) {
return NS_OK;
}
// Don't allow abs-pos descendants of the fixed content to escape the content.
// This should not normally be possible (because fixed-pos elements should
// be absolute containers) but fixed-pos tables currently aren't abs-pos
// containers.
nsFrameConstructorState state(mPresShell, aParentFrame,
nullptr,
mRootElementFrame);
state.mCreatingExtraFrames = true;
// We can't use an ancestor filter here, because we're not going to
// be usefully recurring down the tree. This means that other
// places in frame construction can't assume a filter is
// initialized!
// Iterate across fixed frames and replicate each whose placeholder is a
// descendant of aFrame. (We don't want to explicitly copy placeholders that
// are within fixed frames, because that would cause duplicates on the new
// page - bug 389619)
for (nsIFrame* fixed = firstFixed; fixed; fixed = fixed->GetNextSibling()) {
nsIFrame* prevPlaceholder = GetPlaceholderFrameFor(fixed);
if (prevPlaceholder &&
nsLayoutUtils::IsProperAncestorFrame(prevCanvasFrame, prevPlaceholder)) {
// We want to use the same style as the primary style frame for
// our content
nsIContent* content = fixed->GetContent();
nsStyleContext* styleContext =
nsLayoutUtils::GetStyleFrame(content)->StyleContext();
FrameConstructionItemList items;
AddFrameConstructionItemsInternal(state, content, canvasFrame,
content->Tag(),
content->GetNameSpaceID(),
true,
styleContext,
ITEM_ALLOW_XBL_BASE |
ITEM_ALLOW_PAGE_BREAK,
nullptr, items);
items.SetTriedConstructingFrames();
for (FCItemIterator iter(items); !iter.IsDone(); iter.Next()) {
NS_ASSERTION(iter.item().DesiredParentType() ==
GetParentType(canvasFrame),
"This is not going to work");
ConstructFramesFromItem(state, iter, canvasFrame, fixedPlaceholders);
}
}
}
// Add the placeholders to our primary child list.
// XXXbz this is a little screwed up, since the fixed frames will have
// broken auto-positioning. Oh, well.
NS_ASSERTION(!canvasFrame->GetFirstPrincipalChild(),
"leaking frames; doc root continuation must be empty");
canvasFrame->SetInitialChildList(kPrincipalList, fixedPlaceholders);
return NS_OK;
}
nsIFrame*
nsCSSFrameConstructor::GetInsertionPoint(nsIContent* aContainer,
nsIContent* aChildContent,
bool* aMultiple)
{
nsBindingManager *bindingManager = mDocument->BindingManager();
nsIContent* insertionElement;
if (aChildContent) {
// We've got an explicit insertion child. Check to see if it's
// anonymous.
if (aChildContent->GetBindingParent() == aContainer) {
// This child content is anonymous. Don't use the insertion
// point, since that's only for the explicit kids.
return GetFrameFor(aContainer);
}
insertionElement = bindingManager->FindNestedInsertionPoint(aContainer, aChildContent);
}
else {
bool multiple;
insertionElement = bindingManager->FindNestedSingleInsertionPoint(aContainer, &multiple);
if (multiple) {
if (aMultiple) {
*aMultiple = true;
}
return nullptr;
}
}
if (!insertionElement) {
insertionElement = aContainer;
}
nsIFrame* insertionPoint = GetFrameFor(insertionElement);
// fieldsets have multiple insertion points. Note that we might
// have to look at insertionElement here...
if (aMultiple && insertionElement->IsHTML(nsGkAtoms::fieldset)) {
*aMultiple = true;
}
return insertionPoint;
}
// Capture state for the frame tree rooted at the frame associated with the
// content object, aContent
void
nsCSSFrameConstructor::CaptureStateForFramesOf(nsIContent* aContent,
nsILayoutHistoryState* aHistoryState)
{
if (!aHistoryState) {
return;
}
nsIFrame* frame = aContent->GetPrimaryFrame();
if (frame == mRootElementFrame) {
frame = mFixedContainingBlock;
}
for ( ; frame;
frame = nsLayoutUtils::GetNextContinuationOrSpecialSibling(frame)) {
CaptureFrameState(frame, aHistoryState);
}
}
static bool EqualURIs(mozilla::css::URLValue *aURI1,
mozilla::css::URLValue *aURI2)
{
return aURI1 == aURI2 || // handle null==null, and optimize
(aURI1 && aURI2 && aURI1->URIEquals(*aURI2));
}
nsresult
nsCSSFrameConstructor::MaybeRecreateFramesForElement(Element* aElement)
{
nsRefPtr<nsStyleContext> oldContext = GetUndisplayedContent(aElement);
if (!oldContext) {
return NS_OK;
}
// The parent has a frame, so try resolving a new context.
nsRefPtr<nsStyleContext> newContext = mPresShell->StyleSet()->
ResolveStyleFor(aElement, oldContext->GetParent());
ChangeUndisplayedContent(aElement, newContext);
const nsStyleDisplay* disp = newContext->StyleDisplay();
if (disp->mDisplay == NS_STYLE_DISPLAY_NONE) {
// We can skip trying to recreate frames here, but only if our style
// context does not have a binding URI that differs from our old one.
// Otherwise, we should try to recreate, because we may want to apply the
// new binding
if (!disp->mBinding) {
return NS_OK;
}
const nsStyleDisplay* oldDisp = oldContext->PeekStyleDisplay();
if (oldDisp && EqualURIs(disp->mBinding, oldDisp->mBinding)) {
return NS_OK;
}
}
return RecreateFramesForContent(aElement, false);
}
static nsIFrame*
FindFirstNonWhitespaceChild(nsIFrame* aParentFrame)
{
nsIFrame* f = aParentFrame->GetFirstPrincipalChild();
while (f && f->GetType() == nsGkAtoms::textFrame &&
f->GetContent()->TextIsOnlyWhitespace()) {
f = f->GetNextSibling();
}
return f;
}
static nsIFrame*
FindNextNonWhitespaceSibling(nsIFrame* aFrame)
{
nsIFrame* f = aFrame;
do {
f = f->GetNextSibling();
} while (f && f->GetType() == nsGkAtoms::textFrame &&
f->GetContent()->TextIsOnlyWhitespace());
return f;
}
static nsIFrame*
FindPreviousNonWhitespaceSibling(nsIFrame* aFrame)
{
nsIFrame* f = aFrame;
do {
f = f->GetPrevSibling();
} while (f && f->GetType() == nsGkAtoms::textFrame &&
f->GetContent()->TextIsOnlyWhitespace());
return f;
}
bool
nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval(nsIFrame* aFrame,
nsresult* aResult)
{
NS_PRECONDITION(aFrame, "Must have a frame");
NS_PRECONDITION(aFrame->GetParent(), "Frame shouldn't be root");
NS_PRECONDITION(aResult, "Null out param?");
NS_PRECONDITION(aFrame == aFrame->FirstContinuation(),
"aFrame not the result of GetPrimaryFrame()?");
if (IsFrameSpecial(aFrame)) {
// The removal functions can't handle removal of an {ib} split directly; we
// need to rebuild the containing block.
#ifdef DEBUG
if (gNoisyContentUpdates) {
printf("nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval: "
"frame=");
nsFrame::ListTag(stdout, aFrame);
printf(" is special\n");
}
#endif
*aResult = ReframeContainingBlock(aFrame);
return true;
}
if (aFrame->GetContentInsertionFrame()->GetType() == nsGkAtoms::legendFrame &&
aFrame->GetParent()->GetType() == nsGkAtoms::fieldSetFrame) {
// When we remove the legend for a fieldset, we should reframe
// the fieldset to ensure another legend is used, if there is one
*aResult = RecreateFramesForContent(aFrame->GetParent()->GetContent(), false);
return true;
}
// Now check for possibly needing to reconstruct due to a pseudo parent
nsIFrame* inFlowFrame =
(aFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) ?
GetPlaceholderFrameFor(aFrame) : aFrame;
MOZ_ASSERT(inFlowFrame, "How did that happen?");
MOZ_ASSERT(inFlowFrame == inFlowFrame->FirstContinuation(),
"placeholder for primary frame has previous continuations?");
nsIFrame* parent = inFlowFrame->GetParent();
if (IsTablePseudo(parent)) {
if (FindFirstNonWhitespaceChild(parent) == inFlowFrame ||
!FindNextNonWhitespaceSibling(inFlowFrame->LastContinuation()) ||
// If we're a table-column-group, then the GetFirstChild check above is
// not going to catch cases when we're the first child.
(inFlowFrame->GetType() == nsGkAtoms::tableColGroupFrame &&
parent->GetFirstChild(nsIFrame::kColGroupList) == inFlowFrame) ||
// Similar if we're a table-caption.
(inFlowFrame->GetType() == nsGkAtoms::tableCaptionFrame &&
parent->GetFirstChild(nsIFrame::kCaptionList) == inFlowFrame)) {
// We're the first or last frame in the pseudo. Need to reframe.
// Good enough to recreate frames for |parent|'s content
*aResult = RecreateFramesForContent(parent->GetContent(), true);
return true;
}
}
// Might need to reconstruct things if this frame's nextSibling is a table
// pseudo, since removal of this frame might mean that this pseudo needs to
// get merged with the frame's prevSibling if that's also a table pseudo.
nsIFrame* nextSibling =
FindNextNonWhitespaceSibling(inFlowFrame->LastContinuation());
NS_ASSERTION(!IsTablePseudo(inFlowFrame), "Shouldn't happen here");
if (nextSibling && IsTablePseudo(nextSibling)) {
nsIFrame* prevSibling = FindPreviousNonWhitespaceSibling(inFlowFrame);
if (prevSibling && IsTablePseudo(prevSibling)) {
#ifdef DEBUG
if (gNoisyContentUpdates) {
printf("nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval: "
"frame=");
nsFrame::ListTag(stdout, aFrame);
printf(" has a table pseudo next sibling of different type and a "
"table pseudo prevsibling\n");
}
#endif
// Good enough to recreate frames for aFrame's parent's content; even if
// aFrame's parent is a table pseudo, that'll be the right content node.
*aResult = RecreateFramesForContent(parent->GetContent(), true);
return true;
}
}
// Might need to reconstruct things if the removed frame's nextSibling is an
// anonymous flex item. The removed frame might've been what divided two
// runs of inline content into two anonymous flex items, which would now
// need to be merged.
// NOTE: It's fine that we've advanced nextSibling past whitespace (up above);
// we're only interested in anonymous flex items here, and those can never
// be adjacent to whitespace, since they absorb contiguous runs of inline
// non-replaced content (including whitespace).
if (nextSibling && IsAnonymousFlexItem(nextSibling)) {
NS_ABORT_IF_FALSE(parent->GetType() == nsGkAtoms::flexContainerFrame,
"anonymous flex items should only exist as children "
"of flex container frames");
#ifdef DEBUG
if (gNoisyContentUpdates) {
printf("nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval: "
"frame=");
nsFrame::ListTag(stdout, aFrame);
printf(" has an anonymous flex item as its next sibling\n");
}
#endif // DEBUG
// Recreate frames for the flex container (the removed frame's parent)
*aResult = RecreateFramesForContent(parent->GetContent(), true);
return true;
}
// Might need to reconstruct things if the removed frame's nextSibling is
// null and its parent is an anonymous flex item. (This might be the last
// remaining child of that anonymous flex item, which can then go away.)
if (!nextSibling && IsAnonymousFlexItem(parent)) {
NS_ABORT_IF_FALSE(parent->GetParent() &&
parent->GetParent()->GetType() == nsGkAtoms::flexContainerFrame,
"anonymous flex items should only exist as children "
"of flex container frames");
#ifdef DEBUG
if (gNoisyContentUpdates) {
printf("nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval: "
"frame=");
nsFrame::ListTag(stdout, aFrame);
printf(" has an anonymous flex item as its parent\n");
}
#endif // DEBUG
// Recreate frames for the flex container (the removed frame's grandparent)
*aResult = RecreateFramesForContent(parent->GetParent()->GetContent(),
true);
return true;
}
#ifdef MOZ_XUL
if (aFrame->GetType() == nsGkAtoms::popupSetFrame) {
nsIRootBox* rootBox = nsIRootBox::GetRootBox(mPresShell);
if (rootBox && rootBox->GetPopupSetFrame() == aFrame) {
*aResult = ReconstructDocElementHierarchy();
return true;
}
}
#endif
// Reconstruct if inflowFrame is parent's only child, and parent is, or has,
// a non-fluid continuation, i.e. it was split by bidi resolution
if (!inFlowFrame->GetPrevSibling() &&
!inFlowFrame->GetNextSibling() &&
((parent->GetPrevContinuation() && !parent->GetPrevInFlow()) ||
(parent->GetNextContinuation() && !parent->GetNextInFlow()))) {
*aResult = RecreateFramesForContent(parent->GetContent(), true);
return true;
}
// We might still need to reconstruct things if the parent of inFlowFrame is
// special, since in that case the removal of aFrame might affect the
// splitting of its parent.
if (!IsFrameSpecial(parent)) {
return false;
}
// If inFlowFrame is not the only in-flow child of |parent|, then removing
// it will change nothing about the {ib} split.
if (inFlowFrame != parent->GetFirstPrincipalChild() ||
inFlowFrame->LastContinuation()->GetNextSibling()) {
return false;
}
// If the parent is the first or last part of the {ib} split, then
// removing one of its kids will have no effect on the splitting.
// Get the first continuation up front so we don't have to do it twice.
nsIFrame* parentFirstContinuation = parent->FirstContinuation();
if (!GetSpecialSibling(parentFirstContinuation) ||
!GetSpecialPrevSibling(parentFirstContinuation)) {
return false;
}
#ifdef DEBUG
if (gNoisyContentUpdates) {
printf("nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval: "
"frame=");
nsFrame::ListTag(stdout, parent);
printf(" is special\n");
}
#endif
*aResult = ReframeContainingBlock(parent);
return true;
}
nsresult
nsCSSFrameConstructor::RecreateFramesForContent(nsIContent* aContent,
bool aAsyncInsert)
{
NS_PRECONDITION(!aAsyncInsert || aContent->IsElement(),
"Can only insert elements async");
// If there is no document, we don't want to recreate frames for it. (You
// shouldn't generally be giving this method content without a document
// anyway).
// Rebuilding the frame tree can have bad effects, especially if it's the
// frame tree for chrome (see bug 157322).
NS_ENSURE_TRUE(aContent->GetDocument(), NS_ERROR_FAILURE);
// Is the frame `special'? If so, we need to reframe the containing
// block *here*, rather than trying to remove and re-insert the
// content (which would otherwise result in *two* nested reframe
// containing block from ContentRemoved() and ContentInserted(),
// below!). We'd really like to optimize away one of those
// containing block reframes, hence the code here.
nsIFrame* frame = aContent->GetPrimaryFrame();
if (frame && frame->IsFrameOfType(nsIFrame::eMathML)) {
// Reframe the topmost MathML element to prevent exponential blowup
// (see bug 397518)
while (true) {
nsIContent* parentContent = aContent->GetParent();
nsIFrame* parentContentFrame = parentContent->GetPrimaryFrame();
if (!parentContentFrame || !parentContentFrame->IsFrameOfType(nsIFrame::eMathML))
break;
aContent = parentContent;
frame = parentContentFrame;
}
}
if (frame) {
nsIFrame* nonGeneratedAncestor = nsLayoutUtils::GetNonGeneratedAncestor(frame);
if (nonGeneratedAncestor->GetContent() != aContent) {
return RecreateFramesForContent(nonGeneratedAncestor->GetContent(), aAsyncInsert);
}
nsIFrame* parent = frame->GetParent();
nsIContent* parentContent = parent ? parent->GetContent() : nullptr;
// If the parent frame is a leaf then the subsequent insert will fail to
// create a frame, so we need to recreate the parent content. This happens
// with native anonymous content from the editor.
if (parent && parent->IsLeaf() && parentContent &&
parentContent != aContent) {
return RecreateFramesForContent(parentContent, aAsyncInsert);
}
}
nsresult rv = NS_OK;
if (frame && MaybeRecreateContainerForFrameRemoval(frame, &rv)) {
return rv;
}
nsINode* containerNode = aContent->GetParentNode();
// XXXbz how can containerNode be null here?
if (containerNode) {
// Before removing the frames associated with the content object,
// ask them to save their state onto a temporary state object.
CaptureStateForFramesOf(aContent, mTempFrameTreeState);
// Need the nsIContent parent, which might be null here, since we need to
// pass it to ContentInserted and ContentRemoved.
nsCOMPtr<nsIContent> container = aContent->GetParent();
// Remove the frames associated with the content object.
bool didReconstruct;
rv = ContentRemoved(container, aContent,
aContent->IsRootOfAnonymousSubtree() ?
nullptr :
aContent->GetNextSibling(),
REMOVE_FOR_RECONSTRUCTION, &didReconstruct);
if (NS_SUCCEEDED(rv) && !didReconstruct) {
// Now, recreate the frames associated with this content object. If
// ContentRemoved triggered reconstruction, then we don't need to do this
// because the frames will already have been built.
if (aAsyncInsert) {
RestyleManager()->PostRestyleEvent(
aContent->AsElement(), nsRestyleHint(0), nsChangeHint_ReconstructFrame);
} else {
rv = ContentInserted(container, aContent, mTempFrameTreeState, false);
}
}
}
return rv;
}
//////////////////////////////////////////////////////////////////////
// Block frame construction code
already_AddRefed<nsStyleContext>
nsCSSFrameConstructor::GetFirstLetterStyle(nsIContent* aContent,
nsStyleContext* aStyleContext)
{
if (aContent) {
return mPresShell->StyleSet()->
ResolvePseudoElementStyle(aContent->AsElement(),
nsCSSPseudoElements::ePseudo_firstLetter,
aStyleContext);
}
return nullptr;
}
already_AddRefed<nsStyleContext>
nsCSSFrameConstructor::GetFirstLineStyle(nsIContent* aContent,
nsStyleContext* aStyleContext)
{
if (aContent) {
return mPresShell->StyleSet()->
ResolvePseudoElementStyle(aContent->AsElement(),
nsCSSPseudoElements::ePseudo_firstLine,
aStyleContext);
}
return nullptr;
}
// Predicate to see if a given content (block element) has
// first-letter style applied to it.
bool
nsCSSFrameConstructor::ShouldHaveFirstLetterStyle(nsIContent* aContent,
nsStyleContext* aStyleContext)
{
return nsLayoutUtils::HasPseudoStyle(aContent, aStyleContext,
nsCSSPseudoElements::ePseudo_firstLetter,
mPresShell->GetPresContext());
}
bool
nsCSSFrameConstructor::HasFirstLetterStyle(nsIFrame* aBlockFrame)
{
NS_PRECONDITION(aBlockFrame, "Need a frame");
NS_ASSERTION(nsLayoutUtils::GetAsBlock(aBlockFrame),
"Not a block frame?");
return (aBlockFrame->GetStateBits() & NS_BLOCK_HAS_FIRST_LETTER_STYLE) != 0;
}
bool
nsCSSFrameConstructor::ShouldHaveFirstLineStyle(nsIContent* aContent,
nsStyleContext* aStyleContext)
{
bool hasFirstLine =
nsLayoutUtils::HasPseudoStyle(aContent, aStyleContext,
nsCSSPseudoElements::ePseudo_firstLine,
mPresShell->GetPresContext());
if (hasFirstLine) {
// But disable for fieldsets
int32_t namespaceID;
nsIAtom* tag = mDocument->BindingManager()->ResolveTag(aContent,
&namespaceID);
// This check must match the one in FindHTMLData.
hasFirstLine = tag != nsGkAtoms::fieldset ||
namespaceID != kNameSpaceID_XHTML;
}
return hasFirstLine;
}
void
nsCSSFrameConstructor::ShouldHaveSpecialBlockStyle(nsIContent* aContent,
nsStyleContext* aStyleContext,
bool* aHaveFirstLetterStyle,
bool* aHaveFirstLineStyle)
{
*aHaveFirstLetterStyle =
ShouldHaveFirstLetterStyle(aContent, aStyleContext);
*aHaveFirstLineStyle =
ShouldHaveFirstLineStyle(aContent, aStyleContext);
}
/* static */
const nsCSSFrameConstructor::PseudoParentData
nsCSSFrameConstructor::sPseudoParentData[eParentTypeCount] = {
{ // Cell
FULL_CTOR_FCDATA(FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET |
FCDATA_USE_CHILD_ITEMS |
FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRow),
&nsCSSFrameConstructor::ConstructTableCell),
&nsCSSAnonBoxes::tableCell
},
{ // Row
FULL_CTOR_FCDATA(FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET |
FCDATA_USE_CHILD_ITEMS |
FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRowGroup),
&nsCSSFrameConstructor::ConstructTableRow),
&nsCSSAnonBoxes::tableRow
},
{ // Row group
FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET |
FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_USE_CHILD_ITEMS |
FCDATA_SKIP_ABSPOS_PUSH |
FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable),
NS_NewTableRowGroupFrame),
&nsCSSAnonBoxes::tableRowGroup
},
{ // Column group
FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET |
FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_USE_CHILD_ITEMS |
FCDATA_SKIP_ABSPOS_PUSH |
FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable),
NS_NewTableColGroupFrame),
&nsCSSAnonBoxes::tableColGroup
},
{ // Table
FULL_CTOR_FCDATA(FCDATA_SKIP_FRAMESET | FCDATA_USE_CHILD_ITEMS,
&nsCSSFrameConstructor::ConstructTable),
&nsCSSAnonBoxes::table
}
};
void
nsCSSFrameConstructor::CreateNeededAnonFlexItems(
nsFrameConstructorState& aState,
FrameConstructionItemList& aItems,
nsIFrame* aParentFrame)
{
NS_ABORT_IF_FALSE(aParentFrame->GetType() == nsGkAtoms::flexContainerFrame,
"Should only be called for items in a flex container frame");
if (aItems.IsEmpty()) {
return;
}
FCItemIterator iter(aItems);
do {
// Advance iter past children that don't want to be wrapped
if (iter.SkipItemsThatDontNeedAnonFlexItem(aState)) {
// Hit the end of the items without finding any remaining children that
// need to be wrapped. We're finished!
return;
}
// If our next potentially-wrappable child is whitespace, then see if
// there's anything wrappable immediately after it. If not, we just drop
// the whitespace and move on. (We're not supposed to create any anonymous
// flex items that _only_ contain whitespace).
// (BUT if this is generated content, then we don't give whitespace nodes
// any special treatment, because they're probably not really whitespace --
// they're just temporarily empty, waiting for their generated text.)
// XXXdholbert If this node's generated text will *actually end up being
// entirely whitespace*, then we technically should still skip over it, per
// the flexbox spec. I'm not bothering with that at this point, since it's
// a pretty extreme edge case.
if (!aParentFrame->IsGeneratedContentFrame() &&
iter.item().IsWhitespace(aState)) {
FCItemIterator afterWhitespaceIter(iter);
bool hitEnd = afterWhitespaceIter.SkipWhitespace(aState);
bool nextChildNeedsAnonFlexItem =
!hitEnd && afterWhitespaceIter.item().NeedsAnonFlexItem(aState);
if (!nextChildNeedsAnonFlexItem) {
// There's nothing after the whitespace that we need to wrap, so we
// just drop this run of whitespace.
iter.DeleteItemsTo(afterWhitespaceIter);
if (hitEnd) {
// Nothing left to do -- we're finished!
return;
}
// else, we have a next child and it does not want to be wrapped. So,
// we jump back to the beginning of the loop to skip over that child
// (and anything else non-wrappable after it)
NS_ABORT_IF_FALSE(!iter.IsDone() &&
!iter.item().NeedsAnonFlexItem(aState),
"hitEnd and/or nextChildNeedsAnonFlexItem lied");
continue;
}
}
// Now |iter| points to the first child that needs to be wrapped in an
// anonymous flex item. Now we see how many children after it also want
// to be wrapped in an anonymous flex item.
FCItemIterator endIter(iter); // iterator to find the end of the group
endIter.SkipItemsThatNeedAnonFlexItem(aState);
NS_ASSERTION(iter != endIter,
"Should've had at least one wrappable child to seek past");
// Now, we create the anonymous flex item to contain the children
// between |iter| and |endIter|.
nsIAtom* pseudoType = nsCSSAnonBoxes::anonymousFlexItem;
nsStyleContext* parentStyle = aParentFrame->StyleContext();
nsIContent* parentContent = aParentFrame->GetContent();
nsRefPtr<nsStyleContext> wrapperStyle =
mPresShell->StyleSet()->ResolveAnonymousBoxStyle(pseudoType, parentStyle);
static const FrameConstructionData sBlockFormattingContextFCData =
FCDATA_DECL(FCDATA_SKIP_FRAMESET | FCDATA_USE_CHILD_ITEMS,
NS_NewBlockFormattingContext);
FrameConstructionItem* newItem =
new FrameConstructionItem(&sBlockFormattingContextFCData,
// Use the content of our parent frame
parentContent,
// Lie about the tag; it doesn't matter anyway
pseudoType,
iter.item().mNameSpaceID,
// no pending binding
nullptr,
wrapperStyle.forget(),
true, nullptr);
newItem->mIsAllInline = newItem->mHasInlineEnds =
newItem->mStyleContext->StyleDisplay()->IsInlineOutsideStyle();
newItem->mIsBlock = !newItem->mIsAllInline;
NS_ABORT_IF_FALSE(!newItem->mIsAllInline && newItem->mIsBlock,
"expecting anonymous flex items to be block-level "
"(this will make a difference when we encounter "
"'flex-align: baseline')");
// Anonymous flex items induce line boundaries around their
// contents.
newItem->mChildItems.SetLineBoundaryAtStart(true);
newItem->mChildItems.SetLineBoundaryAtEnd(true);
// The parent of the items in aItems is also the parent of the items
// in mChildItems
newItem->mChildItems.SetParentHasNoXBLChildren(
aItems.ParentHasNoXBLChildren());
// Eat up all items between |iter| and |endIter| and put them in our
// wrapper. This advances |iter| to point to |endIter|.
iter.AppendItemsToList(endIter, newItem->mChildItems);
iter.InsertItem(newItem);
} while (!iter.IsDone());
}
/*
* This function works as follows: we walk through the child list (aItems) and
* find items that cannot have aParentFrame as their parent. We wrap
* continuous runs of such items into a FrameConstructionItem for a frame that
* gets them closer to their desired parents. For example, a run of non-row
* children of a row-group will get wrapped in a row. When we later construct
* the frame for this wrapper (in this case for the row), it'll be the correct
* parent for the cells in the set of items we wrapped or we'll wrap cells
* around everything else. At the end of this method, aItems is guaranteed to
* contain only items for frames that can be direct kids of aParentFrame.
*/
void
nsCSSFrameConstructor::CreateNeededTablePseudos(nsFrameConstructorState& aState,
FrameConstructionItemList& aItems,
nsIFrame* aParentFrame)
{
ParentType ourParentType = GetParentType(aParentFrame);
if (aItems.AllWantParentType(ourParentType)) {
// Nothing to do here
return;
}
FCItemIterator iter(aItems);
do {
if (iter.SkipItemsWantingParentType(ourParentType)) {
// Nothing else to do here; we're finished
return;
}
// Now we're pointing to the first child that wants a different parent
// type.
// Now try to figure out what kids we can group together. We can generally
// group everything that has a different desired parent type from us. Two
// exceptions to this:
// 1) If our parent type is table, we can't group columns with anything
// else other than whitespace.
// 2) Whitespace that lies between two things we can group which both want
// a non-block parent should be dropped, even if we can't group them
// with each other and even if the whitespace wants a parent of
// ourParentType. Ends of the list count as things that don't want a
// block parent (so that for example we'll drop a whitespace-only list).
FCItemIterator endIter(iter); /* iterator to find the end of the group */
ParentType groupingParentType = endIter.item().DesiredParentType();
if (aItems.AllWantParentType(groupingParentType) &&
groupingParentType != eTypeBlock) {
// Just group them all and be done with it. We need the check for
// eTypeBlock here to catch the "all the items are whitespace" case
// described above.
endIter.SetToEnd();
} else {
// Locate the end of the group.
// Keep track of the type the previous item wanted, in case we have to
// deal with whitespace. Start it off with ourParentType, since that's
// the last thing |iter| would have skipped over.
ParentType prevParentType = ourParentType;
do {
/* Walk an iterator past any whitespace that we might be able to drop from the list */
FCItemIterator spaceEndIter(endIter);
if (prevParentType != eTypeBlock &&
!aParentFrame->IsGeneratedContentFrame() &&
spaceEndIter.item().IsWhitespace(aState)) {
bool trailingSpaces = spaceEndIter.SkipWhitespace(aState);
// We drop the whitespace if these are not trailing spaces and the next item
// does not want a block parent (see case 2 above)
// if these are trailing spaces and aParentFrame is a tabular container
// according to rule 1.3 of CSS 2.1 Sec 17.2.1. (Being a tabular container
// pretty much means ourParentType != eTypeBlock besides the eTypeColGroup case,
// which won't reach here.)
if ((trailingSpaces && ourParentType != eTypeBlock) ||
(!trailingSpaces && spaceEndIter.item().DesiredParentType() !=
eTypeBlock)) {
bool updateStart = (iter == endIter);
endIter.DeleteItemsTo(spaceEndIter);
NS_ASSERTION(trailingSpaces == endIter.IsDone(), "These should match");
if (updateStart) {
iter = endIter;
}
if (trailingSpaces) {
break; /* Found group end */
}
if (updateStart) {
// Update groupingParentType, since it might have been eTypeBlock
// just because of the whitespace.
groupingParentType = iter.item().DesiredParentType();
}
}
}
// Now endIter points to a non-whitespace item or a non-droppable
// whitespace item. In the latter case, if this is the end of the group
// we'll traverse this whitespace again. But it'll all just be quick
// DesiredParentType() checks which will match ourParentType (that's
// what it means that this is the group end), so it's OK.
prevParentType = endIter.item().DesiredParentType();
if (prevParentType == ourParentType) {
// End the group at endIter.
break;
}
if (ourParentType == eTypeTable &&
(prevParentType == eTypeColGroup) !=
(groupingParentType == eTypeColGroup)) {
// Either we started with columns and now found something else, or vice
// versa. In any case, end the grouping.
break;
}
// Include the whitespace we didn't drop (if any) in the group, since
// this is not the end of the group. Note that this doesn't change
// prevParentType, since if we didn't drop the whitespace then we ended
// at something that wants a block parent.
endIter = spaceEndIter;
endIter.Next();
} while (!endIter.IsDone());
}
if (iter == endIter) {
// Nothing to wrap here; just skipped some whitespace
continue;
}
// Now group together all the items between iter and endIter. The right
// parent type to use depends on ourParentType.
ParentType wrapperType;
switch (ourParentType) {
case eTypeBlock:
wrapperType = eTypeTable;
break;
case eTypeRow:
// The parent type for a cell is eTypeBlock, since that's what a cell
// looks like to its kids.
wrapperType = eTypeBlock;
break;
case eTypeRowGroup:
wrapperType = eTypeRow;
break;
case eTypeTable:
// Either colgroup or rowgroup, depending on what we're grouping.
wrapperType = groupingParentType == eTypeColGroup ?
eTypeColGroup : eTypeRowGroup;
break;
default:
MOZ_CRASH("Colgroups should be suppresing non-col child items");
}
const PseudoParentData& pseudoData = sPseudoParentData[wrapperType];
nsIAtom* pseudoType = *pseudoData.mPseudoType;
nsStyleContext* parentStyle = aParentFrame->StyleContext();
nsIContent* parentContent = aParentFrame->GetContent();
if (pseudoType == nsCSSAnonBoxes::table &&
parentStyle->StyleDisplay()->mDisplay == NS_STYLE_DISPLAY_INLINE) {
pseudoType = nsCSSAnonBoxes::inlineTable;
}
nsRefPtr<nsStyleContext> wrapperStyle =
mPresShell->StyleSet()->ResolveAnonymousBoxStyle(pseudoType, parentStyle);
FrameConstructionItem* newItem =
new FrameConstructionItem(&pseudoData.mFCData,
// Use the content of our parent frame
parentContent,
// Lie about the tag; it doesn't matter anyway
pseudoType,
// The namespace does matter, however; it needs
// to match that of our first child item to
// match the old behavior
iter.item().mNameSpaceID,
// no pending binding
nullptr,
wrapperStyle.forget(),
true, nullptr);
// Here we're cheating a tad... technically, table-internal items should be
// inline if aParentFrame is inline, but they'll get wrapped in an
// inline-table in the end, so it'll all work out. In any case, arguably
// we don't need to maintain this state at this point... but it's better
// to, I guess.
newItem->mIsAllInline = newItem->mHasInlineEnds =
newItem->mStyleContext->StyleDisplay()->IsInlineOutsideStyle();
// Table pseudo frames always induce line boundaries around their
// contents.
newItem->mChildItems.SetLineBoundaryAtStart(true);
newItem->mChildItems.SetLineBoundaryAtEnd(true);
// The parent of the items in aItems is also the parent of the items
// in mChildItems
newItem->mChildItems.SetParentHasNoXBLChildren(
aItems.ParentHasNoXBLChildren());
// Eat up all items between |iter| and |endIter| and put them in our wrapper
// Advances |iter| to point to |endIter|.
iter.AppendItemsToList(endIter, newItem->mChildItems);
iter.InsertItem(newItem);
// Now |iter| points to the item that was the first one we didn't wrap;
// loop and see whether we need to skip it or wrap it in something
// different.
} while (!iter.IsDone());
}
inline void
nsCSSFrameConstructor::ConstructFramesFromItemList(nsFrameConstructorState& aState,
FrameConstructionItemList& aItems,
nsIFrame* aParentFrame,
nsFrameItems& aFrameItems)
{
aItems.SetTriedConstructingFrames();
CreateNeededTablePseudos(aState, aItems, aParentFrame);
if (aParentFrame->GetType() == nsGkAtoms::flexContainerFrame) {
CreateNeededAnonFlexItems(aState, aItems, aParentFrame);
}
#ifdef DEBUG
for (FCItemIterator iter(aItems); !iter.IsDone(); iter.Next()) {
NS_ASSERTION(iter.item().DesiredParentType() == GetParentType(aParentFrame),
"Needed pseudos didn't get created; expect bad things");
}
#endif
for (FCItemIterator iter(aItems); !iter.IsDone(); iter.Next()) {
ConstructFramesFromItem(aState, iter, aParentFrame, aFrameItems);
}
NS_ASSERTION(!aState.mHavePendingPopupgroup,
"Should have proccessed it by now");
}
void
nsCSSFrameConstructor::AddFCItemsForAnonymousContent(
nsFrameConstructorState& aState,
nsIFrame* aFrame,
nsTArray<nsIAnonymousContentCreator::ContentInfo>& aAnonymousItems,
FrameConstructionItemList& aItemsToConstruct,
uint32_t aExtraFlags)
{
for (uint32_t i = 0; i < aAnonymousItems.Length(); ++i) {
nsIContent* content = aAnonymousItems[i].mContent;
#ifdef DEBUG
nsIAnonymousContentCreator* creator = do_QueryFrame(aFrame);
NS_ASSERTION(!creator || !creator->CreateFrameFor(content),
"If you need to use CreateFrameFor, you need to call "
"CreateAnonymousFrames manually and not follow the standard "
"ProcessChildren() codepath for this frame");
#endif
// Assert some things about this content
NS_ABORT_IF_FALSE(!(content->GetFlags() &
(NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME)),
"Should not be marked as needing frames");
NS_ABORT_IF_FALSE(!content->IsElement() ||
!(content->GetFlags() & ELEMENT_ALL_RESTYLE_FLAGS),
"Should have no pending restyle flags");
NS_ABORT_IF_FALSE(!content->GetPrimaryFrame(),
"Should have no existing frame");
NS_ABORT_IF_FALSE(!content->IsNodeOfType(nsINode::eCOMMENT) &&
!content->IsNodeOfType(nsINode::ePROCESSING_INSTRUCTION),
"Why is someone creating garbage anonymous content");
nsRefPtr<nsStyleContext> styleContext;
TreeMatchContext::AutoFlexItemStyleFixupSkipper
flexItemStyleFixupSkipper(aState.mTreeMatchContext);
if (aAnonymousItems[i].mStyleContext) {
styleContext = aAnonymousItems[i].mStyleContext.forget();
} else {
styleContext = ResolveStyleContext(aFrame, content, &aState);
}
nsTArray<nsIAnonymousContentCreator::ContentInfo>* anonChildren = nullptr;
if (!aAnonymousItems[i].mChildren.IsEmpty()) {
anonChildren = &aAnonymousItems[i].mChildren;
}
uint32_t flags = ITEM_ALLOW_XBL_BASE | ITEM_ALLOW_PAGE_BREAK | aExtraFlags;
AddFrameConstructionItemsInternal(aState, content, aFrame,
content->Tag(), content->GetNameSpaceID(),
true, styleContext, flags,
anonChildren, aItemsToConstruct);
}
}
void
nsCSSFrameConstructor::ProcessChildren(nsFrameConstructorState& aState,
nsIContent* aContent,
nsStyleContext* aStyleContext,
nsIFrame* aFrame,
const bool aCanHaveGeneratedContent,
nsFrameItems& aFrameItems,
const bool aAllowBlockStyles,
PendingBinding* aPendingBinding,
nsIFrame* aPossiblyLeafFrame)
{
NS_PRECONDITION(aFrame, "Must have parent frame here");
NS_PRECONDITION(aFrame->GetContentInsertionFrame() == aFrame,
"Parent frame in ProcessChildren should be its own "
"content insertion frame");
const uint32_t kMaxDepth = 2 * MAX_REFLOW_DEPTH;
static_assert(kMaxDepth <= UINT16_MAX, "mCurrentDepth type is too narrow");
AutoRestore<uint16_t> savedDepth(mCurrentDepth);
if (mCurrentDepth != UINT16_MAX) {
++mCurrentDepth;
}
if (!aPossiblyLeafFrame) {
aPossiblyLeafFrame = aFrame;
}
// XXXbz ideally, this would do all the pushing of various
// containing blocks as needed, so callers don't have to do it...
bool haveFirstLetterStyle = false, haveFirstLineStyle = false;
if (aAllowBlockStyles) {
ShouldHaveSpecialBlockStyle(aContent, aStyleContext, &haveFirstLetterStyle,
&haveFirstLineStyle);
}
// The logic here needs to match the logic in GetFloatContainingBlock()
nsFrameConstructorSaveState floatSaveState;
if (ShouldSuppressFloatingOfDescendants(aFrame)) {
aState.PushFloatContainingBlock(nullptr, floatSaveState);
} else if (aFrame->IsFloatContainingBlock()) {
aState.PushFloatContainingBlock(aFrame, floatSaveState);
}
nsFrameConstructorState::PendingBindingAutoPusher pusher(aState,
aPendingBinding);
FrameConstructionItemList itemsToConstruct;
// If we have first-letter or first-line style then frames can get
// moved around so don't set these flags.
if (aAllowBlockStyles && !haveFirstLetterStyle && !haveFirstLineStyle) {
itemsToConstruct.SetLineBoundaryAtStart(true);
itemsToConstruct.SetLineBoundaryAtEnd(true);
}
// Create any anonymous frames we need here. This must happen before the
// non-anonymous children are processed to ensure that popups are never
// constructed before the popupset.
nsAutoTArray<nsIAnonymousContentCreator::ContentInfo, 4> anonymousItems;
GetAnonymousContent(aContent, aPossiblyLeafFrame, anonymousItems);
#ifdef DEBUG
for (uint32_t i = 0; i < anonymousItems.Length(); ++i) {
NS_ABORT_IF_FALSE(anonymousItems[i].mContent->IsRootOfAnonymousSubtree(),
"Content should know it's an anonymous subtree");
}
#endif
AddFCItemsForAnonymousContent(aState, aFrame, anonymousItems,
itemsToConstruct);
if (!aPossiblyLeafFrame->IsLeaf()) {
// :before/:after content should have the same style context parent
// as normal kids.
// Note that we don't use this style context for looking up things like
// special block styles because in some cases involving table pseudo-frames
// it has nothing to do with the parent frame's desired behavior.
nsStyleContext* styleContext;
if (aCanHaveGeneratedContent) {
aFrame->AddStateBits(NS_FRAME_MAY_HAVE_GENERATED_CONTENT);
styleContext =
nsFrame::CorrectStyleParentFrame(aFrame, nullptr)->StyleContext();
// Probe for generated content before
CreateGeneratedContentItem(aState, aFrame, aContent, styleContext,
nsCSSPseudoElements::ePseudo_before,
itemsToConstruct);
}
const bool addChildItems = MOZ_LIKELY(mCurrentDepth < kMaxDepth);
if (!addChildItems) {
NS_WARNING("ProcessChildren max depth exceeded");
}
FlattenedChildIterator iter(aContent);
for (nsIContent* child = iter.GetNextChild(); child; child = iter.GetNextChild()) {
// Get the parent of the content and check if it is a XBL children element
// (if the content is a children element then parent != aContent because the
// FlattenedChildIterator will transitively iterate through <xbl:children>
// for default content). Push the children element as an ancestor here because
// it does not have a frame and would not otherwise be pushed as an ancestor.
nsIContent* parent = child->GetParent();
MOZ_ASSERT(parent, "Parent must be non-null because we are iterating children.");
MOZ_ASSERT(parent->IsElement());
bool pushInsertionPoint = parent != aContent &&
aState.mTreeMatchContext.mAncestorFilter.HasFilter();
TreeMatchContext::AutoAncestorPusher
ancestorPusher(pushInsertionPoint, aState.mTreeMatchContext,
parent->AsElement());
// Frame construction item construction should not post
// restyles, so removing restyle flags here is safe.
if (child->IsElement()) {
child->UnsetFlags(ELEMENT_ALL_RESTYLE_FLAGS);
}
if (addChildItems) {
AddFrameConstructionItems(aState, child, iter.XBLInvolved(), aFrame,
itemsToConstruct);
} else {
ClearLazyBits(child, child->GetNextSibling());
}
}
itemsToConstruct.SetParentHasNoXBLChildren(!iter.XBLInvolved());
if (aCanHaveGeneratedContent) {
// Probe for generated content after
CreateGeneratedContentItem(aState, aFrame, aContent, styleContext,
nsCSSPseudoElements::ePseudo_after,
itemsToConstruct);
}
} else {
ClearLazyBits(aContent->GetFirstChild(), nullptr);
}
ConstructFramesFromItemList(aState, itemsToConstruct, aFrame, aFrameItems);
NS_ASSERTION(!aAllowBlockStyles || !aFrame->IsBoxFrame(),
"can't be both block and box");
if (haveFirstLetterStyle) {
WrapFramesInFirstLetterFrame(aContent, aFrame, aFrameItems);
}
if (haveFirstLineStyle) {
WrapFramesInFirstLineFrame(aState, aContent, aFrame, nullptr,
aFrameItems);
}
// We might end up with first-line frames that change
// AnyKidsNeedBlockParent() without changing itemsToConstruct, but that
// should never happen for cases whan aFrame->IsBoxFrame().
NS_ASSERTION(!haveFirstLineStyle || !aFrame->IsBoxFrame(),
"Shouldn't have first-line style if we're a box");
NS_ASSERTION(!aFrame->IsBoxFrame() ||
itemsToConstruct.AnyItemsNeedBlockParent() ==
(AnyKidsNeedBlockParent(aFrameItems.FirstChild()) != nullptr),
"Something went awry in our block parent calculations");
if (aFrame->IsBoxFrame() && itemsToConstruct.AnyItemsNeedBlockParent()) {
// XXXbz we could do this on the FrameConstructionItemList level,
// no? And if we cared we could look through the item list
// instead of groveling through the framelist here..
nsStyleContext *frameStyleContext = aFrame->StyleContext();
// Report a warning for non-GC frames:
if (!aFrame->IsGeneratedContentFrame()) {
nsIContent *badKid = AnyKidsNeedBlockParent(aFrameItems.FirstChild());
nsDependentAtomString parentTag(aContent->Tag()), kidTag(badKid->Tag());
const PRUnichar* params[] = { parentTag.get(), kidTag.get() };
const nsStyleDisplay *display = frameStyleContext->StyleDisplay();
const char *message =
(display->mDisplay == NS_STYLE_DISPLAY_INLINE_BOX)
? "NeededToWrapXULInlineBox" : "NeededToWrapXUL";
nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
NS_LITERAL_CSTRING("FrameConstructor"),
mDocument,
nsContentUtils::eXUL_PROPERTIES,
message,
params, ArrayLength(params));
}
nsRefPtr<nsStyleContext> blockSC = mPresShell->StyleSet()->
ResolveAnonymousBoxStyle(nsCSSAnonBoxes::mozXULAnonymousBlock,
frameStyleContext);
nsIFrame *blockFrame = NS_NewBlockFrame(mPresShell, blockSC);
// We might, in theory, want to set NS_BLOCK_FLOAT_MGR and
// NS_BLOCK_MARGIN_ROOT, but I think it's a bad idea given that
// a real block placed here wouldn't get those set on it.
InitAndRestoreFrame(aState, aContent, aFrame, blockFrame, false);
NS_ASSERTION(!blockFrame->HasView(), "need to do view reparenting");
ReparentFrames(this, blockFrame, aFrameItems);
blockFrame->SetInitialChildList(kPrincipalList, aFrameItems);
NS_ASSERTION(aFrameItems.IsEmpty(), "How did that happen?");
aFrameItems.Clear();
aFrameItems.AddChild(blockFrame);
aFrame->AddStateBits(NS_STATE_BOX_WRAPS_KIDS_IN_BLOCK);
}
}
//----------------------------------------------------------------------
// Support for :first-line style
// Special routine to handle placing a list of frames into a block
// frame that has first-line style. The routine ensures that the first
// collection of inline frames end up in a first-line frame.
// NOTE: aState may have containing block information related to a
// different part of the frame tree than where the first line occurs.
// In particular aState may be set up for where ContentInserted or
// ContentAppended is inserting content, which may be some
// non-first-in-flow continuation of the block to which the first-line
// belongs. So this function needs to be careful about how it uses
// aState.
void
nsCSSFrameConstructor::WrapFramesInFirstLineFrame(
nsFrameConstructorState& aState,
nsIContent* aBlockContent,
nsIFrame* aBlockFrame,
nsIFrame* aLineFrame,
nsFrameItems& aFrameItems)
{
// Find the part of aFrameItems that we want to put in the first-line
nsFrameList::FrameLinkEnumerator link(aFrameItems);
while (!link.AtEnd() && link.NextFrame()->IsInlineOutside()) {
link.Next();
}
nsFrameList firstLineChildren = aFrameItems.ExtractHead(link);
if (firstLineChildren.IsEmpty()) {
// Nothing is supposed to go into the first-line; nothing to do
return;
}
if (!aLineFrame) {
// Create line frame
nsStyleContext* parentStyle =
nsFrame::CorrectStyleParentFrame(aBlockFrame,
nsCSSPseudoElements::firstLine)->
StyleContext();
nsRefPtr<nsStyleContext> firstLineStyle = GetFirstLineStyle(aBlockContent,
parentStyle);
aLineFrame = NS_NewFirstLineFrame(mPresShell, firstLineStyle);
// Initialize the line frame
InitAndRestoreFrame(aState, aBlockContent, aBlockFrame, aLineFrame);
// The lineFrame will be the block's first child; the rest of the
// frame list (after lastInlineFrame) will be the second and
// subsequent children; insert lineFrame into aFrameItems.
aFrameItems.InsertFrame(nullptr, nullptr, aLineFrame);
NS_ASSERTION(aLineFrame->StyleContext() == firstLineStyle,
"Bogus style context on line frame");
}
// Give the inline frames to the lineFrame <b>after</b> reparenting them
ReparentFrames(this, aLineFrame, firstLineChildren);
if (aLineFrame->PrincipalChildList().IsEmpty() &&
(aLineFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
aLineFrame->SetInitialChildList(kPrincipalList, firstLineChildren);
} else {
AppendFrames(aLineFrame, kPrincipalList, firstLineChildren);
}
}
// Special routine to handle appending a new frame to a block frame's
// child list. Takes care of placing the new frame into the right
// place when first-line style is present.
void
nsCSSFrameConstructor::AppendFirstLineFrames(
nsFrameConstructorState& aState,
nsIContent* aBlockContent,
nsIFrame* aBlockFrame,
nsFrameItems& aFrameItems)
{
// It's possible that aBlockFrame needs to have a first-line frame
// created because it doesn't currently have any children.
const nsFrameList& blockKids = aBlockFrame->PrincipalChildList();
if (blockKids.IsEmpty()) {
WrapFramesInFirstLineFrame(aState, aBlockContent,
aBlockFrame, nullptr, aFrameItems);
return;
}
// Examine the last block child - if it's a first-line frame then
// appended frames need special treatment.
nsIFrame* lastBlockKid = blockKids.LastChild();
if (lastBlockKid->GetType() != nsGkAtoms::lineFrame) {
// No first-line frame at the end of the list, therefore there is
// an intervening block between any first-line frame the frames
// we are appending. Therefore, we don't need any special
// treatment of the appended frames.
return;
}
WrapFramesInFirstLineFrame(aState, aBlockContent, aBlockFrame,
lastBlockKid, aFrameItems);
}
// Special routine to handle inserting a new frame into a block
// frame's child list. Takes care of placing the new frame into the
// right place when first-line style is present.
nsresult
nsCSSFrameConstructor::InsertFirstLineFrames(
nsFrameConstructorState& aState,
nsIContent* aContent,
nsIFrame* aBlockFrame,
nsIFrame** aParentFrame,
nsIFrame* aPrevSibling,
nsFrameItems& aFrameItems)
{
nsresult rv = NS_OK;
// XXXbz If you make this method actually do something, check to
// make sure that the caller is passing what you expect. In
// particular, which content is aContent? And audit the rest of
// this code too; it makes bogus assumptions and may not build.
#if 0
nsIFrame* parentFrame = *aParentFrame;
nsIFrame* newFrame = aFrameItems.childList;
bool isInline = IsInlineOutside(newFrame);
if (!aPrevSibling) {
// Insertion will become the first frame. Two cases: we either
// already have a first-line frame or we don't.
nsIFrame* firstBlockKid = aBlockFrame->GetFirstPrincipalChild();
if (firstBlockKid->GetType() == nsGkAtoms::lineFrame) {
// We already have a first-line frame
nsIFrame* lineFrame = firstBlockKid;
if (isInline) {
// Easy case: the new inline frame will go into the lineFrame.
ReparentFrame(this, lineFrame, newFrame);
InsertFrames(lineFrame, kPrincipalList, nullptr, newFrame);
// Since the frame is going into the lineFrame, don't let it
// go into the block too.
aFrameItems.childList = nullptr;
aFrameItems.lastChild = nullptr;
}
else {
// Harder case: We are about to insert a block level element
// before the first-line frame.
// XXX need a method to steal away frames from the line-frame
}
}
else {
// We do not have a first-line frame
if (isInline) {
// We now need a first-line frame to contain the inline frame.
nsIFrame* lineFrame = NS_NewFirstLineFrame(firstLineStyle);
if (NS_SUCCEEDED(rv)) {
// Lookup first-line style context
nsStyleContext* parentStyle =
nsFrame::CorrectStyleParentFrame(aBlockFrame,
nsCSSPseudoElements::firstLine)->
StyleContext();
nsRefPtr<nsStyleContext> firstLineStyle =
GetFirstLineStyle(aContent, parentStyle);
// Initialize the line frame
InitAndRestoreFrame(aState, aContent, aBlockFrame, lineFrame);
// Make sure the caller inserts the lineFrame into the
// blocks list of children.
aFrameItems.childList = lineFrame;
aFrameItems.lastChild = lineFrame;
// Give the inline frames to the lineFrame <b>after</b>
// reparenting them
NS_ASSERTION(lineFrame->StyleContext() == firstLineStyle,
"Bogus style context on line frame");
ReparentFrame(aPresContext, lineFrame, newFrame);
lineFrame->SetInitialChildList(kPrincipalList, newFrame);
}
}
else {
// Easy case: the regular insertion logic can insert the new
// frame because it's a block frame.
}
}
}
else {
// Insertion will not be the first frame.
nsIFrame* prevSiblingParent = aPrevSibling->GetParent();
if (prevSiblingParent == aBlockFrame) {
// Easy case: The prev-siblings parent is the block
// frame. Therefore the prev-sibling is not currently in a
// line-frame. Therefore the new frame which is going after it,
// regardless of type, is not going into a line-frame.
}
else {
// If the prevSiblingParent is not the block-frame then it must
// be a line-frame (if it were a letter-frame, that logic would
// already have adjusted the prev-sibling to be the
// letter-frame).
if (isInline) {
// Easy case: the insertion can go where the caller thinks it
// should go (which is into prevSiblingParent).
}
else {
// Block elements don't end up in line-frames, therefore
// change the insertion point to aBlockFrame. However, there
// might be more inline elements following aPrevSibling that
// need to be pulled out of the line-frame and become children
// of the block.
nsIFrame* nextSibling = aPrevSibling->GetNextSibling();
nsIFrame* nextLineFrame = prevSiblingParent->GetNextInFlow();
if (nextSibling || nextLineFrame) {
// Oy. We have work to do. Create a list of the new frames
// that are going into the block by stripping them away from
// the line-frame(s).
if (nextSibling) {
nsLineFrame* lineFrame = (nsLineFrame*) prevSiblingParent;
nsFrameList tail = lineFrame->StealFramesAfter(aPrevSibling);
// XXX do something with 'tail'
}
nsLineFrame* nextLineFrame = (nsLineFrame*) lineFrame;
for (;;) {
nextLineFrame = nextLineFrame->GetNextInFlow();
if (!nextLineFrame) {
break;
}
nsIFrame* kids = nextLineFrame->GetFirstPrincipalChild();
}
}
else {
// We got lucky: aPrevSibling was the last inline frame in
// the line-frame.
ReparentFrame(this, aBlockFrame, newFrame);
InsertFrames(aBlockFrame, kPrincipalList,
prevSiblingParent, newFrame);
aFrameItems.childList = nullptr;
aFrameItems.lastChild = nullptr;
}
}
}
}
#endif
return rv;
}
//----------------------------------------------------------------------
// First-letter support
// Determine how many characters in the text fragment apply to the
// first letter
static int32_t
FirstLetterCount(const nsTextFragment* aFragment)
{
int32_t count = 0;
int32_t firstLetterLength = 0;
int32_t i, n = aFragment->GetLength();
for (i = 0; i < n; i++) {
PRUnichar ch = aFragment->CharAt(i);
// FIXME: take content language into account when deciding whitespace.
if (dom::IsSpaceCharacter(ch)) {
if (firstLetterLength) {
break;
}
count++;
continue;
}
// XXX I18n
if ((ch == '\'') || (ch == '\"')) {
if (firstLetterLength) {
break;
}
// keep looping
firstLetterLength = 1;
}
else {
count++;
break;
}
}
return count;
}
static bool
NeedFirstLetterContinuation(nsIContent* aContent)
{
NS_PRECONDITION(aContent, "null ptr");
bool result = false;
if (aContent) {
const nsTextFragment* frag = aContent->GetText();
if (frag) {
int32_t flc = FirstLetterCount(frag);
int32_t tl = frag->GetLength();
if (flc < tl) {
result = true;
}
}
}
return result;
}
static bool IsFirstLetterContent(nsIContent* aContent)
{
return aContent->TextLength() &&
!aContent->TextIsOnlyWhitespace();
}
/**
* Create a letter frame, only make it a floating frame.
*/
void
nsCSSFrameConstructor::CreateFloatingLetterFrame(
nsFrameConstructorState& aState,
nsIFrame* aBlockFrame,
nsIContent* aTextContent,
nsIFrame* aTextFrame,
nsIContent* aBlockContent,
nsIFrame* aParentFrame,
nsStyleContext* aStyleContext,
nsFrameItems& aResult)
{
// Create the first-letter-frame
nsIFrame* letterFrame;
nsStyleSet *styleSet = mPresShell->StyleSet();
letterFrame = NS_NewFirstLetterFrame(mPresShell, aStyleContext);
// We don't want to use a text content for a non-text frame (because we want
// its primary frame to be a text frame). So use its parent for the
// first-letter.
nsIContent* letterContent = aTextContent->GetParent();
nsIFrame* containingBlock = aState.GetGeometricParent(
aStyleContext->StyleDisplay(), aParentFrame);
InitAndRestoreFrame(aState, letterContent, containingBlock, letterFrame);
// Init the text frame to refer to the letter frame. Make sure we
// get a proper style context for it (the one passed in is for the
// letter frame and will have the float property set on it; the text
// frame shouldn't have that set).
nsRefPtr<nsStyleContext> textSC;
textSC = styleSet->ResolveStyleForNonElement(aStyleContext);
aTextFrame->SetStyleContextWithoutNotification(textSC);
InitAndRestoreFrame(aState, aTextContent, letterFrame, aTextFrame);
// And then give the text frame to the letter frame
SetInitialSingleChild(letterFrame, aTextFrame);
// See if we will need to continue the text frame (does it contain
// more than just the first-letter text or not?) If it does, then we
// create (in advance) a continuation frame for it.
nsIFrame* nextTextFrame = nullptr;
if (NeedFirstLetterContinuation(aTextContent)) {
// Create continuation
nextTextFrame =
CreateContinuingFrame(aState.mPresContext, aTextFrame, aParentFrame);
// Repair the continuations style context
nsStyleContext* parentStyleContext = aStyleContext->GetParent();
if (parentStyleContext) {
nsRefPtr<nsStyleContext> newSC;
newSC = styleSet->ResolveStyleForNonElement(parentStyleContext);
nextTextFrame->SetStyleContext(newSC);
}
}
NS_ASSERTION(aResult.IsEmpty(), "aResult should be an empty nsFrameItems!");
// Put the new float before any of the floats in the block we're doing
// first-letter for, that is, before any floats whose parent is
// containingBlock.
nsFrameList::FrameLinkEnumerator link(aState.mFloatedItems);
while (!link.AtEnd() && link.NextFrame()->GetParent() != containingBlock) {
link.Next();
}
aState.AddChild(letterFrame, aResult, letterContent, aStyleContext,
aParentFrame, false, true, false, true,
link.PrevFrame());
if (nextTextFrame) {
aResult.AddChild(nextTextFrame);
}
}
/**
* Create a new letter frame for aTextFrame. The letter frame will be
* a child of aParentFrame.
*/
void
nsCSSFrameConstructor::CreateLetterFrame(nsIFrame* aBlockFrame,
nsIFrame* aBlockContinuation,
nsIContent* aTextContent,
nsIFrame* aParentFrame,
nsFrameItems& aResult)
{
NS_PRECONDITION(aTextContent->IsNodeOfType(nsINode::eTEXT),
"aTextContent isn't text");
NS_ASSERTION(nsLayoutUtils::GetAsBlock(aBlockFrame),
"Not a block frame?");
// Get style context for the first-letter-frame
nsStyleContext* parentStyleContext =
nsFrame::CorrectStyleParentFrame(aParentFrame,
nsCSSPseudoElements::firstLetter)->
StyleContext();
// Use content from containing block so that we can actually
// find a matching style rule.
nsIContent* blockContent = aBlockFrame->GetContent();
// Create first-letter style rule
nsRefPtr<nsStyleContext> sc = GetFirstLetterStyle(blockContent,
parentStyleContext);
if (sc) {
nsRefPtr<nsStyleContext> textSC;
textSC = mPresShell->StyleSet()->ResolveStyleForNonElement(sc);
// Create a new text frame (the original one will be discarded)
// pass a temporary stylecontext, the correct one will be set
// later. Start off by unsetting the primary frame for
// aTextContent, so it's no longer pointing to the to-be-destroyed
// frame.
// XXXbz it would be really nice to destroy the old frame _first_,
// then create the new one, so we could avoid this hack.
aTextContent->SetPrimaryFrame(nullptr);
nsIFrame* textFrame = NS_NewTextFrame(mPresShell, textSC);
NS_ASSERTION(aBlockContinuation == GetFloatContainingBlock(aParentFrame),
"Containing block is confused");
nsFrameConstructorState state(mPresShell,
GetAbsoluteContainingBlock(aParentFrame, FIXED_POS),
GetAbsoluteContainingBlock(aParentFrame, ABS_POS),
aBlockContinuation);
// Create the right type of first-letter frame
const nsStyleDisplay* display = sc->StyleDisplay();
if (display->IsFloatingStyle() && !aParentFrame->IsSVGText()) {
// Make a floating first-letter frame
CreateFloatingLetterFrame(state, aBlockFrame, aTextContent, textFrame,
blockContent, aParentFrame, sc, aResult);
}
else {
// Make an inflow first-letter frame
nsIFrame* letterFrame = NS_NewFirstLetterFrame(mPresShell, sc);
// Initialize the first-letter-frame. We don't want to use a text
// content for a non-text frame (because we want its primary frame to
// be a text frame). So use its parent for the first-letter.
nsIContent* letterContent = aTextContent->GetParent();
letterFrame->Init(letterContent, aParentFrame, nullptr);
InitAndRestoreFrame(state, aTextContent, letterFrame, textFrame);
SetInitialSingleChild(letterFrame, textFrame);
aResult.Clear();
aResult.AddChild(letterFrame);
NS_ASSERTION(!aBlockFrame->GetPrevContinuation(),
"should have the first continuation here");
aBlockFrame->AddStateBits(NS_BLOCK_HAS_FIRST_LETTER_CHILD);
}
aTextContent->SetPrimaryFrame(textFrame);
}
}
void
nsCSSFrameConstructor::WrapFramesInFirstLetterFrame(
nsIContent* aBlockContent,
nsIFrame* aBlockFrame,
nsFrameItems& aBlockFrames)
{
aBlockFrame->AddStateBits(NS_BLOCK_HAS_FIRST_LETTER_STYLE);
nsIFrame* parentFrame = nullptr;
nsIFrame* textFrame = nullptr;
nsIFrame* prevFrame = nullptr;
nsFrameItems letterFrames;
bool stopLooking = false;
WrapFramesInFirstLetterFrame(aBlockFrame, aBlockFrame, aBlockFrame,
aBlockFrames.FirstChild(),
&parentFrame, &textFrame, &prevFrame,
letterFrames, &stopLooking);
if (parentFrame) {
if (parentFrame == aBlockFrame) {
// Take textFrame out of the block's frame list and substitute the
// letter frame(s) instead.
aBlockFrames.DestroyFrame(textFrame);
aBlockFrames.InsertFrames(nullptr, prevFrame, letterFrames);
}
else {
// Take the old textFrame out of the inline parent's child list
RemoveFrame(kPrincipalList, textFrame);
// Insert in the letter frame(s)
parentFrame->InsertFrames(kPrincipalList, prevFrame, letterFrames);
}
}
}
void
nsCSSFrameConstructor::WrapFramesInFirstLetterFrame(
nsIFrame* aBlockFrame,
nsIFrame* aBlockContinuation,
nsIFrame* aParentFrame,
nsIFrame* aParentFrameList,
nsIFrame** aModifiedParent,
nsIFrame** aTextFrame,
nsIFrame** aPrevFrame,
nsFrameItems& aLetterFrames,
bool* aStopLooking)
{
nsIFrame* prevFrame = nullptr;
nsIFrame* frame = aParentFrameList;
while (frame) {
nsIFrame* nextFrame = frame->GetNextSibling();
nsIAtom* frameType = frame->GetType();
if (nsGkAtoms::textFrame == frameType) {
// Wrap up first-letter content in a letter frame
nsIContent* textContent = frame->GetContent();
if (IsFirstLetterContent(textContent)) {
// Create letter frame to wrap up the text
CreateLetterFrame(aBlockFrame, aBlockContinuation, textContent,
aParentFrame, aLetterFrames);
// Provide adjustment information for parent
*aModifiedParent = aParentFrame;
*aTextFrame = frame;
*aPrevFrame = prevFrame;
*aStopLooking = true;
return;
}
}
else if (IsInlineFrame(frame) && frameType != nsGkAtoms::brFrame) {
nsIFrame* kids = frame->GetFirstPrincipalChild();
WrapFramesInFirstLetterFrame(aBlockFrame, aBlockContinuation, frame,
kids, aModifiedParent, aTextFrame,
aPrevFrame, aLetterFrames, aStopLooking);
if (*aStopLooking) {
return;
}
}
else {
// This will stop us looking to create more letter frames. For
// example, maybe the frame-type is "letterFrame" or
// "placeholderFrame". This keeps us from creating extra letter
// frames, and also prevents us from creating letter frames when
// the first real content child of a block is not text (e.g. an
// image, hr, etc.)
*aStopLooking = true;
break;
}
prevFrame = frame;
frame = nextFrame;
}
}
static nsIFrame*
FindFirstLetterFrame(nsIFrame* aFrame, nsIFrame::ChildListID aListID)
{
nsFrameList list = aFrame->GetChildList(aListID);
for (nsFrameList::Enumerator e(list); !e.AtEnd(); e.Next()) {
if (nsGkAtoms::letterFrame == e.get()->GetType()) {
return e.get();
}
}
return nullptr;
}
nsresult
nsCSSFrameConstructor::RemoveFloatingFirstLetterFrames(
nsPresContext* aPresContext,
nsIPresShell* aPresShell,
nsIFrame* aBlockFrame,
bool* aStopLooking)
{
// Look for the first letter frame on the kFloatList, then kPushedFloatsList.
nsIFrame* floatFrame =
::FindFirstLetterFrame(aBlockFrame, nsIFrame::kFloatList);
if (!floatFrame) {
floatFrame =
::FindFirstLetterFrame(aBlockFrame, nsIFrame::kPushedFloatsList);
if (!floatFrame) {
return NS_OK;
}
}
// Take the text frame away from the letter frame (so it isn't
// destroyed when we destroy the letter frame).
nsIFrame* textFrame = floatFrame->GetFirstPrincipalChild();
if (!textFrame) {
return NS_OK;
}
// Discover the placeholder frame for the letter frame
nsIFrame* parentFrame;
nsPlaceholderFrame* placeholderFrame = GetPlaceholderFrameFor(floatFrame);
if (!placeholderFrame) {
// Somethings really wrong
return NS_OK;
}
parentFrame = placeholderFrame->GetParent();
if (!parentFrame) {
// Somethings really wrong
return NS_OK;
}
// Create a new text frame with the right style context that maps
// all of the content that was previously part of the letter frame
// (and probably continued elsewhere).
nsStyleContext* parentSC = parentFrame->StyleContext();
nsIContent* textContent = textFrame->GetContent();
if (!textContent) {
return NS_OK;
}
nsRefPtr<nsStyleContext> newSC;
newSC = aPresShell->StyleSet()->ResolveStyleForNonElement(parentSC);
nsIFrame* newTextFrame = NS_NewTextFrame(aPresShell, newSC);
newTextFrame->Init(textContent, parentFrame, nullptr);
// Destroy the old text frame's continuations (the old text frame
// will be destroyed when its letter frame is destroyed).
nsIFrame* frameToDelete = textFrame->LastContinuation();
while (frameToDelete != textFrame) {
nsIFrame* nextFrameToDelete = frameToDelete->GetPrevContinuation();
RemoveFrame(kPrincipalList, frameToDelete);
frameToDelete = nextFrameToDelete;
}
nsIFrame* prevSibling = placeholderFrame->GetPrevSibling();
// Now that everything is set...
#ifdef NOISY_FIRST_LETTER
printf("RemoveFloatingFirstLetterFrames: textContent=%p oldTextFrame=%p newTextFrame=%p\n",
textContent.get(), textFrame, newTextFrame);
#endif
// Remove placeholder frame and the float
RemoveFrame(kPrincipalList, placeholderFrame);
// Now that the old frames are gone, we can start pointing to our
// new primary frame.
textContent->SetPrimaryFrame(newTextFrame);
// Wallpaper bug 822910.
if (prevSibling && prevSibling->GetType() == nsGkAtoms::textFrame) {
prevSibling->AddStateBits(NS_FRAME_IS_DIRTY);
}
// Insert text frame in its place
nsFrameList textList(newTextFrame, newTextFrame);
InsertFrames(parentFrame, kPrincipalList, prevSibling, textList);
return NS_OK;
}
nsresult
nsCSSFrameConstructor::RemoveFirstLetterFrames(nsPresContext* aPresContext,
nsIPresShell* aPresShell,
nsIFrame* aFrame,
nsIFrame* aBlockFrame,
bool* aStopLooking)
{
nsIFrame* prevSibling = nullptr;
nsIFrame* kid = aFrame->GetFirstPrincipalChild();
while (kid) {
if (nsGkAtoms::letterFrame == kid->GetType()) {
// Bingo. Found it. First steal away the text frame.
nsIFrame* textFrame = kid->GetFirstPrincipalChild();
if (!textFrame) {
break;
}
// Create a new textframe
nsStyleContext* parentSC = aFrame->StyleContext();
if (!parentSC) {
break;
}
nsIContent* textContent = textFrame->GetContent();
if (!textContent) {
break;
}
nsRefPtr<nsStyleContext> newSC;
newSC = aPresShell->StyleSet()->ResolveStyleForNonElement(parentSC);
textFrame = NS_NewTextFrame(aPresShell, newSC);
textFrame->Init(textContent, aFrame, nullptr);
// Next rip out the kid and replace it with the text frame
RemoveFrame(kPrincipalList, kid);
// Now that the old frames are gone, we can start pointing to our
// new primary frame.
textContent->SetPrimaryFrame(textFrame);
// Wallpaper bug 822910.
if (prevSibling && prevSibling->GetType() == nsGkAtoms::textFrame) {
prevSibling->AddStateBits(NS_FRAME_IS_DIRTY);
}
// Insert text frame in its place
nsFrameList textList(textFrame, textFrame);
InsertFrames(aFrame, kPrincipalList, prevSibling, textList);
*aStopLooking = true;
NS_ASSERTION(!aBlockFrame->GetPrevContinuation(),
"should have the first continuation here");
aBlockFrame->RemoveStateBits(NS_BLOCK_HAS_FIRST_LETTER_CHILD);
break;
}
else if (IsInlineFrame(kid)) {
// Look inside child inline frame for the letter frame
RemoveFirstLetterFrames(aPresContext, aPresShell,
kid, aBlockFrame, aStopLooking);
if (*aStopLooking) {
break;
}
}
prevSibling = kid;
kid = kid->GetNextSibling();
}
return NS_OK;
}
nsresult
nsCSSFrameConstructor::RemoveLetterFrames(nsPresContext* aPresContext,
nsIPresShell* aPresShell,
nsIFrame* aBlockFrame)
{
aBlockFrame = aBlockFrame->FirstContinuation();
nsIFrame* continuation = aBlockFrame;
bool stopLooking = false;
nsresult rv;
do {
rv = RemoveFloatingFirstLetterFrames(aPresContext, aPresShell,
continuation, &stopLooking);
if (NS_SUCCEEDED(rv) && !stopLooking) {
rv = RemoveFirstLetterFrames(aPresContext, aPresShell,
continuation, aBlockFrame, &stopLooking);
}
if (stopLooking) {
break;
}
continuation = continuation->GetNextContinuation();
} while (continuation);
return rv;
}
// Fixup the letter frame situation for the given block
void
nsCSSFrameConstructor::RecoverLetterFrames(nsIFrame* aBlockFrame)
{
aBlockFrame = aBlockFrame->FirstContinuation();
nsIFrame* continuation = aBlockFrame;
nsIFrame* parentFrame = nullptr;
nsIFrame* textFrame = nullptr;
nsIFrame* prevFrame = nullptr;
nsFrameItems letterFrames;
bool stopLooking = false;
do {
// XXX shouldn't this bit be set already (bug 408493), assert instead?
continuation->AddStateBits(NS_BLOCK_HAS_FIRST_LETTER_STYLE);
WrapFramesInFirstLetterFrame(aBlockFrame, continuation, continuation,
continuation->GetFirstPrincipalChild(),
&parentFrame, &textFrame, &prevFrame,
letterFrames, &stopLooking);
if (stopLooking) {
break;
}
continuation = continuation->GetNextContinuation();
} while (continuation);
if (parentFrame) {
// Take the old textFrame out of the parents child list
RemoveFrame(kPrincipalList, textFrame);
// Insert in the letter frame(s)
parentFrame->InsertFrames(kPrincipalList, prevFrame, letterFrames);
}
}
//----------------------------------------------------------------------
// listbox Widget Routines
nsresult
nsCSSFrameConstructor::CreateListBoxContent(nsPresContext* aPresContext,
nsIFrame* aParentFrame,
nsIFrame* aPrevFrame,
nsIContent* aChild,
nsIFrame** aNewFrame,
bool aIsAppend,
bool aIsScrollbar,
nsILayoutHistoryState* aFrameState)
{
#ifdef MOZ_XUL
nsresult rv = NS_OK;
// Construct a new frame
if (nullptr != aParentFrame) {
nsFrameItems frameItems;
nsFrameConstructorState state(mPresShell, GetAbsoluteContainingBlock(aParentFrame, FIXED_POS),
GetAbsoluteContainingBlock(aParentFrame, ABS_POS),
GetFloatContainingBlock(aParentFrame),
mTempFrameTreeState);
// If we ever initialize the ancestor filter on |state|, make sure
// to push the right parent!
nsRefPtr<nsStyleContext> styleContext;
styleContext = ResolveStyleContext(aParentFrame, aChild, &state);
// Pre-check for display "none" - only if we find that, do we create
// any frame at all
const nsStyleDisplay* display = styleContext->StyleDisplay();
if (NS_STYLE_DISPLAY_NONE == display->mDisplay) {
*aNewFrame = nullptr;
return NS_OK;
}
BeginUpdate();
FrameConstructionItemList items;
AddFrameConstructionItemsInternal(state, aChild, aParentFrame,
aChild->Tag(), aChild->GetNameSpaceID(),
true, styleContext,
ITEM_ALLOW_XBL_BASE, nullptr, items);
ConstructFramesFromItemList(state, items, aParentFrame, frameItems);
nsIFrame* newFrame = frameItems.FirstChild();
*aNewFrame = newFrame;
if (newFrame) {
// Notify the parent frame
if (aIsAppend)
rv = ((nsListBoxBodyFrame*)aParentFrame)->ListBoxAppendFrames(frameItems);
else
rv = ((nsListBoxBodyFrame*)aParentFrame)->ListBoxInsertFrames(aPrevFrame, frameItems);
}
EndUpdate();
#ifdef ACCESSIBILITY
if (newFrame) {
nsAccessibilityService* accService = nsIPresShell::AccService();
if (accService) {
accService->ContentRangeInserted(mPresShell, aChild->GetParent(),
aChild, aChild->GetNextSibling());
}
}
#endif
}
return rv;
#else
return NS_ERROR_FAILURE;
#endif
}
//----------------------------------------
void
nsCSSFrameConstructor::ConstructBlock(nsFrameConstructorState& aState,
const nsStyleDisplay* aDisplay,
nsIContent* aContent,
nsIFrame* aParentFrame,
nsIFrame* aContentParentFrame,
nsStyleContext* aStyleContext,
nsIFrame** aNewFrame,
nsFrameItems& aFrameItems,
nsIFrame* aPositionedFrameForAbsPosContainer,
PendingBinding* aPendingBinding)
{
// Create column wrapper if necessary
nsIFrame* blockFrame = *aNewFrame;
NS_ASSERTION(blockFrame->GetType() == nsGkAtoms::blockFrame, "not a block frame?");
nsIFrame* parent = aParentFrame;
nsRefPtr<nsStyleContext> blockStyle = aStyleContext;
const nsStyleColumn* columns = aStyleContext->StyleColumn();
if (columns->mColumnCount != NS_STYLE_COLUMN_COUNT_AUTO
|| columns->mColumnWidth.GetUnit() != eStyleUnit_Auto) {
nsIFrame* columnSetFrame = nullptr;
columnSetFrame = NS_NewColumnSetFrame(mPresShell, aStyleContext, 0);
InitAndRestoreFrame(aState, aContent, aParentFrame, columnSetFrame);
blockStyle = mPresShell->StyleSet()->
ResolveAnonymousBoxStyle(nsCSSAnonBoxes::columnContent, aStyleContext);
parent = columnSetFrame;
*aNewFrame = columnSetFrame;
SetInitialSingleChild(columnSetFrame, blockFrame);
}
blockFrame->SetStyleContextWithoutNotification(blockStyle);
InitAndRestoreFrame(aState, aContent, parent, blockFrame);
aState.AddChild(*aNewFrame, aFrameItems, aContent, aStyleContext,
aContentParentFrame ? aContentParentFrame :
aParentFrame);
if (!mRootElementFrame) {
// The frame we're constructing will be the root element frame.
// Set mRootElementFrame before processing children.
mRootElementFrame = *aNewFrame;
}
// We should make the outer frame be the absolute containing block,
// if one is required. We have to do this because absolute
// positioning must be computed with respect to the CSS dimensions
// of the element, which are the dimensions of the outer block. But
// we can't really do that because only blocks can have absolute
// children. So use the block and try to compensate with hacks
// in nsBlockFrame::CalculateContainingBlockSizeForAbsolutes.
nsFrameConstructorSaveState absoluteSaveState;
(*aNewFrame)->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
if (aPositionedFrameForAbsPosContainer) {
// NS_ASSERTION(aRelPos, "should have made area frame for this");
aState.PushAbsoluteContainingBlock(*aNewFrame, aPositionedFrameForAbsPosContainer, absoluteSaveState);
}
// Process the child content
nsFrameItems childItems;
ProcessChildren(aState, aContent, aStyleContext, blockFrame, true,
childItems, true, aPendingBinding);
// Set the frame's initial child list
blockFrame->SetInitialChildList(kPrincipalList, childItems);
}
nsIFrame*
nsCSSFrameConstructor::ConstructInline(nsFrameConstructorState& aState,
FrameConstructionItem& aItem,
nsIFrame* aParentFrame,
const nsStyleDisplay* aDisplay,
nsFrameItems& aFrameItems)
{
// If an inline frame has non-inline kids, then we chop up the child list
// into runs of blocks and runs of inlines, create anonymous block frames to
// contain the runs of blocks, inline frames with our style context for the
// runs of inlines, and put all these frames, in order, into aFrameItems. We
// return the the first one. The whole setup is called an {ib}
// split; in what follows "frames in the split" refers to the anonymous blocks
// and inlines that contain our children.
//
// {ib} splits maintain the following invariants:
// 1) All frames in the split have the NS_FRAME_IS_SPECIAL bit set.
// 2) Each frame in the split has the nsIFrame::IBSplitSpecialSibling
// property pointing to the next frame in the split, except for the last
// one, which does not have it set.
// 3) Each frame in the split has the nsIFrame::IBSplitSpecialPrevSibling
// property pointing to the previous frame in the split, except for the
// first one, which does not have it set.
// 4) The first and last frame in the split are always inlines.
//
// An invariant that is NOT maintained is that the wrappers are actually
// linked via GetNextSibling linkage. A simple example is an inline
// containing an inline that contains a block. The three parts of the inner
// inline end up with three different parents.
//
// For example, this HTML:
// <span>
// <div>a</div>
// <span>
// b
// <div>c</div>
// </span>
// d
// <div>e</div>
// f
// </span>
// Gives the following frame tree:
//
// Inline (outer span)
// Block (anonymous, outer span)
// Block (div)
// Text("a")
// Inline (outer span)
// Inline (inner span)
// Text("b")
// Block (anonymous, outer span)
// Block (anonymous, inner span)
// Block (div)
// Text("c")
// Inline (outer span)
// Inline (inner span)
// Text("d")
// Block (anonymous, outer span)
// Block (div)
// Text("e")
// Inline (outer span)
// Text("f")
nsIContent* const content = aItem.mContent;
nsStyleContext* const styleContext = aItem.mStyleContext;
bool positioned =
NS_STYLE_DISPLAY_INLINE == aDisplay->mDisplay &&
aDisplay->IsRelativelyPositionedStyle() &&
!aParentFrame->IsSVGText();
nsIFrame* newFrame = NS_NewInlineFrame(mPresShell, styleContext);
// Initialize the frame
InitAndRestoreFrame(aState, content, aParentFrame, newFrame);
// Inline frames can always have generated content
newFrame->AddStateBits(NS_FRAME_MAY_HAVE_GENERATED_CONTENT);
nsFrameConstructorSaveState absoluteSaveState; // definition cannot be inside next block
// because the object's destructor is significant
// this is part of the fix for bug 42372
newFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
if (positioned) {
// Relatively positioned frames becomes a container for child
// frames that are positioned
aState.PushAbsoluteContainingBlock(newFrame, newFrame, absoluteSaveState);
}
// Process the child content
nsFrameItems childItems;
ConstructFramesFromItemList(aState, aItem.mChildItems, newFrame, childItems);
nsFrameList::FrameLinkEnumerator firstBlockEnumerator(childItems);
if (!aItem.mIsAllInline) {
FindFirstBlock(firstBlockEnumerator);
}
if (aItem.mIsAllInline || firstBlockEnumerator.AtEnd()) {
// This part is easy. We either already know we have no non-inline kids,
// or haven't found any when constructing actual frames (the latter can
// happen only if out-of-flows that we thought had no containing block
// acquired one when ancestor inline frames and {ib} splits got
// constructed). Just put all the kids into the single inline frame and
// bail.
newFrame->SetInitialChildList(kPrincipalList, childItems);
aState.AddChild(newFrame, aFrameItems, content, styleContext, aParentFrame);
return newFrame;
}
// This inline frame contains several types of children. Therefore this frame
// has to be chopped into several pieces, as described above.
// Grab the first inline's kids
nsFrameList firstInlineKids = childItems.ExtractHead(firstBlockEnumerator);
newFrame->SetInitialChildList(kPrincipalList, firstInlineKids);
aFrameItems.AddChild(newFrame);
CreateIBSiblings(aState, newFrame, positioned, childItems, aFrameItems);
return newFrame;
}
void
nsCSSFrameConstructor::CreateIBSiblings(nsFrameConstructorState& aState,
nsIFrame* aInitialInline,
bool aIsPositioned,
nsFrameItems& aChildItems,
nsFrameItems& aSiblings)
{
nsIContent* content = aInitialInline->GetContent();
nsStyleContext* styleContext = aInitialInline->StyleContext();
nsIFrame* parentFrame = aInitialInline->GetParent();
// Resolve the right style context for our anonymous blocks.
// The distinction in styles is needed because of CSS 2.1, section
// 9.2.1.1, which says:
// When such an inline box is affected by relative positioning, any
// resulting translation also affects the block-level box contained
// in the inline box.
nsRefPtr<nsStyleContext> blockSC =
mPresShell->StyleSet()->
ResolveAnonymousBoxStyle(aIsPositioned ?
nsCSSAnonBoxes::mozAnonymousPositionedBlock :
nsCSSAnonBoxes::mozAnonymousBlock,
styleContext);
nsIFrame* lastNewInline = aInitialInline->FirstContinuation();
do {
// On entry to this loop aChildItems is not empty and the first frame in it
// is block-level.
NS_PRECONDITION(aChildItems.NotEmpty(), "Should have child items");
NS_PRECONDITION(!aChildItems.FirstChild()->IsInlineOutside(),
"Must have list starting with block");
// The initial run of blocks belongs to an anonymous block that we create
// right now. The anonymous block will be the parent of these block
// children of the inline.
nsIFrame* blockFrame;
blockFrame = NS_NewBlockFrame(mPresShell, blockSC);
InitAndRestoreFrame(aState, content, parentFrame, blockFrame, false);
// Find the first non-block child which defines the end of our block kids
// and the start of our next inline's kids
nsFrameList::FrameLinkEnumerator firstNonBlock =
FindFirstNonBlock(aChildItems);
nsFrameList blockKids = aChildItems.ExtractHead(firstNonBlock);
MoveChildrenTo(aState.mPresContext, aInitialInline, blockFrame, blockKids);
SetFrameIsSpecial(lastNewInline, blockFrame);
aSiblings.AddChild(blockFrame);
// Now grab the initial inlines in aChildItems and put them into an inline
// frame
nsIFrame* inlineFrame = NS_NewInlineFrame(mPresShell, styleContext);
InitAndRestoreFrame(aState, content, parentFrame, inlineFrame, false);
inlineFrame->AddStateBits(NS_FRAME_MAY_HAVE_GENERATED_CONTENT |
NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
if (aIsPositioned) {
inlineFrame->MarkAsAbsoluteContainingBlock();
}
if (aChildItems.NotEmpty()) {
nsFrameList::FrameLinkEnumerator firstBlock(aChildItems);
FindFirstBlock(firstBlock);
nsFrameList inlineKids = aChildItems.ExtractHead(firstBlock);
MoveChildrenTo(aState.mPresContext, aInitialInline, inlineFrame,
inlineKids);
}
SetFrameIsSpecial(blockFrame, inlineFrame);
aSiblings.AddChild(inlineFrame);
lastNewInline = inlineFrame;
} while (aChildItems.NotEmpty());
SetFrameIsSpecial(lastNewInline, nullptr);
}
void
nsCSSFrameConstructor::BuildInlineChildItems(nsFrameConstructorState& aState,
FrameConstructionItem& aParentItem,
bool aItemIsWithinSVGText,
bool aItemAllowsTextPathChild)
{
// XXXbz should we preallocate aParentItem.mChildItems to some sane
// length? Maybe even to parentContent->GetChildCount()?
nsFrameConstructorState::PendingBindingAutoPusher
pusher(aState, aParentItem.mPendingBinding);
nsStyleContext* const parentStyleContext = aParentItem.mStyleContext;
nsIContent* const parentContent = aParentItem.mContent;
TreeMatchContext::AutoAncestorPusher
ancestorPusher(aState.mTreeMatchContext.mAncestorFilter.HasFilter(),
aState.mTreeMatchContext,
parentContent->AsElement());
if (!aItemIsWithinSVGText) {
// Probe for generated content before
CreateGeneratedContentItem(aState, nullptr, parentContent, parentStyleContext,
nsCSSPseudoElements::ePseudo_before,
aParentItem.mChildItems);
}
uint32_t flags = ITEM_ALLOW_XBL_BASE | ITEM_ALLOW_PAGE_BREAK;
if (aItemIsWithinSVGText) {
flags |= ITEM_IS_WITHIN_SVG_TEXT;
}
if (aItemAllowsTextPathChild && aParentItem.mIsForSVGAElement) {
flags |= ITEM_ALLOWS_TEXT_PATH_CHILD;
}
if (!aParentItem.mAnonChildren.IsEmpty()) {
// Use the anon-children list instead of the content tree child list so
// that we use any special style context that should be associated with
// the children, and so that we won't try to construct grandchildren frame
// constructor items before the frame is available for their parent.
AddFCItemsForAnonymousContent(aState, nullptr, aParentItem.mAnonChildren,
aParentItem.mChildItems, flags);
} else {
// Use the content tree child list:
FlattenedChildIterator iter(parentContent);
for (nsIContent* content = iter.GetNextChild(); content; content = iter.GetNextChild()) {
// Get the parent of the content and check if it is a XBL children element
// (if the content is a children element then contentParent != parentContent because the
// FlattenedChildIterator will transitively iterate through <xbl:children>
// for default content). Push the children element as an ancestor here because
// it does not have a frame and would not otherwise be pushed as an ancestor.
nsIContent* contentParent = content->GetParent();
MOZ_ASSERT(contentParent, "Parent must be non-null because we are iterating children.");
MOZ_ASSERT(contentParent->IsElement());
bool pushInsertionPoint = contentParent != parentContent &&
aState.mTreeMatchContext.mAncestorFilter.HasFilter();
TreeMatchContext::AutoAncestorPusher
insertionPointPusher(pushInsertionPoint, aState.mTreeMatchContext,
contentParent->AsElement());
// Manually check for comments/PIs, since we don't have a frame to pass to
// AddFrameConstructionItems. We know our parent is a non-replaced inline,
// so there is no need to do the NeedFrameFor check.
content->UnsetFlags(NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME);
if (content->IsNodeOfType(nsINode::eCOMMENT) ||
content->IsNodeOfType(nsINode::ePROCESSING_INSTRUCTION)) {
continue;
}
if (content->IsElement()) {
// See comment explaining why we need to remove the "is possible
// restyle root" flags in AddFrameConstructionItems. But note
// that we can remove all restyle flags, just like in
// ProcessChildren and for the same reason.
content->UnsetFlags(ELEMENT_ALL_RESTYLE_FLAGS);
}
nsRefPtr<nsStyleContext> childContext =
ResolveStyleContext(parentStyleContext, content, &aState);
AddFrameConstructionItemsInternal(aState, content, nullptr, content->Tag(),
content->GetNameSpaceID(),
iter.XBLInvolved(), childContext,
flags, nullptr,
aParentItem.mChildItems);
}
}
if (!aItemIsWithinSVGText) {
// Probe for generated content after
CreateGeneratedContentItem(aState, nullptr, parentContent, parentStyleContext,
nsCSSPseudoElements::ePseudo_after,
aParentItem.mChildItems);
}
aParentItem.mIsAllInline = aParentItem.mChildItems.AreAllItemsInline();
}
// return whether it's ok to append (in the AppendFrames sense) to
// aParentFrame if our nextSibling is aNextSibling. aParentFrame must
// be an {ib} special inline.
static bool
IsSafeToAppendToSpecialInline(nsIFrame* aParentFrame, nsIFrame* aNextSibling)
{
NS_PRECONDITION(IsInlineFrame(aParentFrame),
"Must have an inline parent here");
do {
NS_ASSERTION(IsFrameSpecial(aParentFrame), "How is this not special?");
if (aNextSibling || aParentFrame->GetNextContinuation() ||
GetSpecialSibling(aParentFrame)) {
return false;
}
aNextSibling = aParentFrame->GetNextSibling();
aParentFrame = aParentFrame->GetParent();
} while (IsInlineFrame(aParentFrame));
return true;
}
bool
nsCSSFrameConstructor::WipeContainingBlock(nsFrameConstructorState& aState,
nsIFrame* aContainingBlock,
nsIFrame* aFrame,
FrameConstructionItemList& aItems,
bool aIsAppend,
nsIFrame* aPrevSibling)
{
if (aItems.IsEmpty()) {
return false;
}
// Before we go and append the frames, we must check for several
// special situations.
// Situation #1 is a XUL frame that contains frames that are required
// to be wrapped in blocks.
if (aFrame->IsBoxFrame() &&
!(aFrame->GetStateBits() & NS_STATE_BOX_WRAPS_KIDS_IN_BLOCK) &&
aItems.AnyItemsNeedBlockParent()) {
RecreateFramesForContent(aFrame->GetContent(), true);
return true;
}
nsIFrame* nextSibling = ::GetInsertNextSibling(aFrame, aPrevSibling);
// Situation #2 is a flex container frame into which we're inserting new
// inline non-replaced children, adjacent to an existing anonymous flex item.
if (aFrame->GetType() == nsGkAtoms::flexContainerFrame) {
FCItemIterator iter(aItems);
// Check if we're adding to-be-wrapped content right *after* an existing
// anonymous flex item (which would need to absorb this content).
if (aPrevSibling && IsAnonymousFlexItem(aPrevSibling) &&
iter.item().NeedsAnonFlexItem(aState)) {
RecreateFramesForContent(aFrame->GetContent(), true);
return true;
}
// Check if we're adding to-be-wrapped content right *before* an existing
// anonymous flex item (which would need to absorb this content).
if (nextSibling && IsAnonymousFlexItem(nextSibling)) {
// Jump to the last entry in the list
iter.SetToEnd();
iter.Prev();
if (iter.item().NeedsAnonFlexItem(aState)) {
RecreateFramesForContent(aFrame->GetContent(), true);
return true;
}
}
}
// Situation #3 is an anonymous flex item that's getting new children who
// don't want to be wrapped.
if (IsAnonymousFlexItem(aFrame)) {
nsIFrame* flexContainerFrame = aFrame->GetParent();
NS_ABORT_IF_FALSE(flexContainerFrame &&
flexContainerFrame->GetType() == nsGkAtoms::flexContainerFrame,
"anonymous flex items should only exist as children "
"of flex container frames");
// We need to push a null float containing block to be sure that
// "NeedsAnonFlexItem" will know we're not honoring floats for this
// inserted content. (In particular, this is necessary in order for
// NeedsAnonFlexItem's "GetGeometricParent" call to return the correct
// result.) We're not honoring floats on this content because it has the
// _flex container_ as its parent in the content tree.
nsFrameConstructorSaveState floatSaveState;
aState.PushFloatContainingBlock(nullptr, floatSaveState);
FCItemIterator iter(aItems);
// Skip over things that _do_ need an anonymous flex item, because
// they're perfectly happy to go here -- they won't cause a reframe.
if (!iter.SkipItemsThatNeedAnonFlexItem(aState)) {
// We hit something that _doesn't_ need an anonymous flex item!
// Rebuild the flex container to bust it out.
RecreateFramesForContent(flexContainerFrame->GetContent(), true);
return true;
}
// If we get here, then everything in |aItems| needs to be wrapped in
// an anonymous flex item. That's where it's already going - good!
}
// Situation #4 is a case when table pseudo-frames don't work out right
ParentType parentType = GetParentType(aFrame);
// If all the kids want a parent of the type that aFrame is, then we're all
// set to go. Indeed, there won't be any table pseudo-frames created between
// aFrame and the kids, so those won't need to be merged with any table
// pseudo-frames that might already be kids of aFrame. If aFrame itself is a
// table pseudo-frame, then all the kids in this list would have wanted a
// frame of that type wrapping them anyway, so putting them inside it is ok.
if (!aItems.AllWantParentType(parentType)) {
// Don't give up yet. If parentType is not eTypeBlock and the parent is
// not a generated content frame, then try filtering whitespace out of the
// list.
if (parentType != eTypeBlock && !aFrame->IsGeneratedContentFrame()) {
// For leading whitespace followed by a kid that wants our parent type,
// there are four cases:
// 1) We have a previous sibling which is not a table pseudo. That means
// that previous sibling wanted a (non-block) parent of the type we're
// looking at. Then the whitespace comes between two table-internal
// elements, so should be collapsed out.
// 2) We have a previous sibling which is a table pseudo. It might have
// kids who want this whitespace, so we need to reframe.
// 3) We have no previous sibling and our parent frame is not a table
// pseudo. That means that we'll be at the beginning of our actual
// non-block-type parent, and the whitespace is OK to collapse out.
// If something is ever inserted before us, it'll find our own parent
// as its parent and if it's something that would care about the
// whitespace it'll want a block parent, so it'll trigger a reframe at
// that point.
// 4) We have no previous sibling and our parent frame is a table pseudo.
// Need to reframe.
// All that is predicated on finding the correct previous sibling. We
// might have to walk backwards along continuations from aFrame to do so.
//
// It's always OK to drop whitespace between any two items that want a
// parent of type parentType.
//
// For trailing whitespace preceded by a kid that wants our parent type,
// there are four cases:
// 1) We have a next sibling which is not a table pseudo. That means
// that next sibling wanted a (non-block) parent of the type we're
// looking at. Then the whitespace comes between two table-internal
// elements, so should be collapsed out.
// 2) We have a next sibling which is a table pseudo. It might have
// kids who want this whitespace, so we need to reframe.
// 3) We have no next sibling and our parent frame is not a table
// pseudo. That means that we'll be at the end of our actual
// non-block-type parent, and the whitespace is OK to collapse out.
// If something is ever inserted after us, it'll find our own parent
// as its parent and if it's something that would care about the
// whitespace it'll want a block parent, so it'll trigger a reframe at
// that point.
// 4) We have no next sibling and our parent frame is a table pseudo.
// Need to reframe.
// All that is predicated on finding the correct next sibling. We might
// have to walk forward along continuations from aFrame to do so. That
// said, in the case when nextSibling is null at this point and aIsAppend
// is true, we know we're in case 3. Furthermore, in that case we don't
// even have to worry about the table pseudo situation; we know our
// parent is not a table pseudo there.
FCItemIterator iter(aItems);
FCItemIterator start(iter);
do {
if (iter.SkipItemsWantingParentType(parentType)) {
break;
}
// iter points to an item that wants a different parent. If it's not
// whitespace, we're done; no more point scanning the list.
if (!iter.item().IsWhitespace(aState)) {
break;
}
if (iter == start) {
// Leading whitespace. How to handle this depends on our
// previous sibling and aFrame. See the long comment above.
nsIFrame* prevSibling = aPrevSibling;
if (!prevSibling) {
// Try to find one after all
nsIFrame* parentPrevCont = aFrame->GetPrevContinuation();
while (parentPrevCont) {
prevSibling = parentPrevCont->GetLastChild(kPrincipalList);
if (prevSibling) {
break;
}
parentPrevCont = parentPrevCont->GetPrevContinuation();
}
};
if (prevSibling) {
if (IsTablePseudo(prevSibling)) {
// need to reframe
break;
}
} else if (IsTablePseudo(aFrame)) {
// need to reframe
break;
}
}
FCItemIterator spaceEndIter(iter);
// Advance spaceEndIter past any whitespace
bool trailingSpaces = spaceEndIter.SkipWhitespace(aState);
bool okToDrop;
if (trailingSpaces) {
// Trailing whitespace. How to handle this depeds on aIsAppend, our
// next sibling and aFrame. See the long comment above.
okToDrop = aIsAppend && !nextSibling;
if (!okToDrop) {
if (!nextSibling) {
// Try to find one after all
nsIFrame* parentNextCont = aFrame->GetNextContinuation();
while (parentNextCont) {
nextSibling = parentNextCont->GetFirstPrincipalChild();
if (nextSibling) {
break;
}
parentNextCont = parentNextCont->GetNextContinuation();
}
}
okToDrop = (nextSibling && !IsTablePseudo(nextSibling)) ||
(!nextSibling && !IsTablePseudo(aFrame));
}
#ifdef DEBUG
else {
NS_ASSERTION(!IsTablePseudo(aFrame), "How did that happen?");
}
#endif
} else {
okToDrop = (spaceEndIter.item().DesiredParentType() == parentType);
}
if (okToDrop) {
iter.DeleteItemsTo(spaceEndIter);
} else {
// We're done: we don't want to drop the whitespace, and it has the
// wrong parent type.
break;
}
// Now loop, since |iter| points to item right after the whitespace we
// removed.
} while (!iter.IsDone());
}
// We might be able to figure out some sort of optimizations here, but they
// would have to depend on having a correct aPrevSibling and a correct next
// sibling. For example, we can probably avoid reframing if none of
// aFrame, aPrevSibling, and next sibling are table pseudo-frames. But it
// doesn't seem worth it to worry about that for now, especially since we
// in fact do not have a reliable aPrevSibling, nor any next sibling, in
// this method.
// aItems might have changed, so recheck the parent type thing. In fact,
// it might be empty, so recheck that too.
if (aItems.IsEmpty()) {
return false;
}
if (!aItems.AllWantParentType(parentType)) {
// Reframing aFrame->GetContent() is good enough, since the content of
// table pseudo-frames is the ancestor content.
RecreateFramesForContent(aFrame->GetContent(), true);
return true;
}
}
// Now we have several cases involving {ib} splits. Put them all in a
// do/while with breaks to take us to the "go and reconstruct" code.
do {
if (IsInlineFrame(aFrame)) {
if (aItems.AreAllItemsInline()) {
// We can just put the kids in.
return false;
}
if (!IsFrameSpecial(aFrame)) {
// Need to go ahead and reconstruct.
break;
}
// Now we're adding kids including some blocks to an inline part of an
// {ib} split. If we plan to call AppendFrames, and don't have a next
// sibling for the new frames, and our parent is the last continuation of
// the last part of the {ib} split, and the same is true of all our
// ancestor inlines (they have no following continuations and they're the
// last part of their {ib} splits and we'd be adding to the end for all
// of them), then AppendFrames will handle things for us. Bail out in
// that case.
if (aIsAppend && IsSafeToAppendToSpecialInline(aFrame, nextSibling)) {
return false;
}
// Need to reconstruct.
break;
}
// Now we know we have a block parent. If it's not special, we're all set.
if (!IsFrameSpecial(aFrame)) {
return false;
}
// We're adding some kids to a block part of an {ib} split. If all the
// kids are blocks, we don't need to reconstruct.
if (aItems.AreAllItemsBlock()) {
return false;
}
// We might have some inline kids for this block. Just reconstruct.
break;
} while (0);
// If we don't have a containing block, start with aFrame and look for one.
if (!aContainingBlock) {
aContainingBlock = aFrame;
}
// To find the right block to reframe, just walk up the tree until we find a
// frame that is:
// 1) Not part of an IB split (not special)
// 2) Not a pseudo-frame
// 3) Not an inline frame
// We're guaranteed to find one, since nsStyleContext::ApplyStyleFixups
// enforces that the root is display:none, display:table, or display:block.
// Note that walking up "too far" is OK in terms of correctness, even if it
// might be a little inefficient. This is why we walk out of all
// pseudo-frames -- telling which ones are or are not OK to walk out of is
// too hard (and I suspect that we do in fact need to walk out of all of
// them).
while (IsFrameSpecial(aContainingBlock) || aContainingBlock->IsInlineOutside() ||
aContainingBlock->StyleContext()->GetPseudo()) {
aContainingBlock = aContainingBlock->GetParent();
NS_ASSERTION(aContainingBlock,
"Must have non-inline, non-special, non-pseudo frame as root "
"(or child of root, for a table root)!");
}
// Tell parent of the containing block to reformulate the
// entire block. This is painful and definitely not optimal
// but it will *always* get the right answer.
nsIContent *blockContent = aContainingBlock->GetContent();
#ifdef DEBUG
if (gNoisyContentUpdates) {
printf("nsCSSFrameConstructor::WipeContainingBlock: blockContent=%p\n",
static_cast<void*>(blockContent));
}
#endif
RecreateFramesForContent(blockContent, true);
return true;
}
nsresult
nsCSSFrameConstructor::ReframeContainingBlock(nsIFrame* aFrame)
{
#ifdef DEBUG
// ReframeContainingBlock is a NASTY routine, it causes terrible performance problems
// so I want to see when it is happening! Unfortunately, it is happening way to often because
// so much content on the web causes 'special' block-in-inline frame situations and we handle them
// very poorly
if (gNoisyContentUpdates) {
printf("nsCSSFrameConstructor::ReframeContainingBlock frame=%p\n",
static_cast<void*>(aFrame));
}
#endif
// XXXbz how exactly would we get here while isReflowing anyway? Should this
// whole test be ifdef DEBUG?
if (mPresShell->IsReflowLocked()) {
// don't ReframeContainingBlock, this will result in a crash
// if we remove a tree that's in reflow - see bug 121368 for testcase
NS_ERROR("Atemptted to nsCSSFrameConstructor::ReframeContainingBlock during a Reflow!!!");
return NS_OK;
}
// Get the first "normal" ancestor of the target frame.
nsIFrame* containingBlock = GetIBContainingBlockFor(aFrame);
if (containingBlock) {
// From here we look for the containing block in case the target
// frame is already a block (which can happen when an inline frame
// wraps some of its content in an anonymous block; see
// ConstructInline)
// NOTE: We used to get the FloatContainingBlock here, but it was often wrong.
// GetIBContainingBlock works much better and provides the correct container in all cases
// so GetFloatContainingBlock(aFrame) has been removed
// And get the containingBlock's content
nsCOMPtr<nsIContent> blockContent = containingBlock->GetContent();
if (blockContent) {
#ifdef DEBUG
if (gNoisyContentUpdates) {
printf(" ==> blockContent=%p\n", static_cast<void*>(blockContent));
}
#endif
return RecreateFramesForContent(blockContent, true);
}
}
// If we get here, we're screwed!
return RecreateFramesForContent(mPresShell->GetDocument()->GetRootElement(),
true);
}
nsresult
nsCSSFrameConstructor::GenerateChildFrames(nsIFrame* aFrame)
{
{
nsAutoScriptBlocker scriptBlocker;
BeginUpdate();
nsFrameItems childItems;
nsFrameConstructorState state(mPresShell, nullptr, nullptr, nullptr);
// We don't have a parent frame with a pending binding constructor here,
// so no need to worry about ordering of the kids' constructors with it.
// Pass null for the PendingBinding.
ProcessChildren(state, aFrame->GetContent(), aFrame->StyleContext(),
aFrame, false, childItems, false,
nullptr);
aFrame->SetInitialChildList(kPrincipalList, childItems);
EndUpdate();
}
#ifdef ACCESSIBILITY
nsAccessibilityService* accService = nsIPresShell::AccService();
if (accService) {
nsIContent* container = aFrame->GetContent();
nsIContent* child = container->GetFirstChild();
if (child) {
accService->ContentRangeInserted(mPresShell, container, child, nullptr);
}
}
#endif
// call XBL constructors after the frames are created
mPresShell->GetDocument()->BindingManager()->ProcessAttachedQueue();
return NS_OK;
}
//////////////////////////////////////////////////////////
// nsCSSFrameConstructor::FrameConstructionItem methods //
//////////////////////////////////////////////////////////
bool
nsCSSFrameConstructor::
FrameConstructionItem::IsWhitespace(nsFrameConstructorState& aState) const
{
NS_PRECONDITION(aState.mCreatingExtraFrames ||
!mContent->GetPrimaryFrame(), "How did that happen?");
if (!mIsText) {
return false;
}
mContent->SetFlags(NS_CREATE_FRAME_IF_NON_WHITESPACE |
NS_REFRAME_IF_WHITESPACE);
return mContent->TextIsOnlyWhitespace();
}
//////////////////////////////////////////////////////////////
// nsCSSFrameConstructor::FrameConstructionItemList methods //
//////////////////////////////////////////////////////////////
void
nsCSSFrameConstructor::FrameConstructionItemList::
AdjustCountsForItem(FrameConstructionItem* aItem, int32_t aDelta)
{
NS_PRECONDITION(aDelta == 1 || aDelta == -1, "Unexpected delta");
mItemCount += aDelta;
if (aItem->mIsAllInline) {
mInlineCount += aDelta;
}
if (aItem->mIsBlock) {
mBlockCount += aDelta;
}
if (aItem->mIsLineParticipant) {
mLineParticipantCount += aDelta;
}
mDesiredParentCounts[aItem->DesiredParentType()] += aDelta;
}
////////////////////////////////////////////////////////////////////////
// nsCSSFrameConstructor::FrameConstructionItemList::Iterator methods //
////////////////////////////////////////////////////////////////////////
inline bool
nsCSSFrameConstructor::FrameConstructionItemList::
Iterator::SkipItemsWantingParentType(ParentType aParentType)
{
NS_PRECONDITION(!IsDone(), "Shouldn't be done yet");
while (item().DesiredParentType() == aParentType) {
Next();
if (IsDone()) {
return true;
}
}
return false;
}
bool
nsCSSFrameConstructor::FrameConstructionItem::
NeedsAnonFlexItem(const nsFrameConstructorState& aState)
{
if (mFCData->mBits & FCDATA_IS_LINE_PARTICIPANT) {
// This will be an inline non-replaced box.
return true;
}
if (!(mFCData->mBits & FCDATA_DISALLOW_OUT_OF_FLOW) &&
aState.GetGeometricParent(mStyleContext->StyleDisplay(), nullptr)) {
// We're abspos or fixedpos, which means we'll spawn a placeholder which
// we'll need to wrap in an anonymous flex item. So, we just treat
// _this_ frame as if _it_ needs to be wrapped in an anonymous flex item,
// and then when we spawn the placeholder, it'll end up in the right spot.
return true;
}
return false;
}
inline bool
nsCSSFrameConstructor::FrameConstructionItemList::
Iterator::SkipItemsThatNeedAnonFlexItem(
const nsFrameConstructorState& aState)
{
NS_PRECONDITION(!IsDone(), "Shouldn't be done yet");
while (item().NeedsAnonFlexItem(aState)) {
Next();
if (IsDone()) {
return true;
}
}
return false;
}
inline bool
nsCSSFrameConstructor::FrameConstructionItemList::
Iterator::SkipItemsThatDontNeedAnonFlexItem(
const nsFrameConstructorState& aState)
{
NS_PRECONDITION(!IsDone(), "Shouldn't be done yet");
while (!(item().NeedsAnonFlexItem(aState))) {
Next();
if (IsDone()) {
return true;
}
}
return false;
}
inline bool
nsCSSFrameConstructor::FrameConstructionItemList::
Iterator::SkipWhitespace(nsFrameConstructorState& aState)
{
NS_PRECONDITION(!IsDone(), "Shouldn't be done yet");
NS_PRECONDITION(item().IsWhitespace(aState), "Not pointing to whitespace?");
do {
Next();
if (IsDone()) {
return true;
}
} while (item().IsWhitespace(aState));
return false;
}
void
nsCSSFrameConstructor::FrameConstructionItemList::
Iterator::AppendItemToList(FrameConstructionItemList& aTargetList)
{
NS_ASSERTION(&aTargetList != &mList, "Unexpected call");
NS_PRECONDITION(!IsDone(), "should not be done");
FrameConstructionItem* item = ToItem(mCurrent);
Next();
PR_REMOVE_LINK(item);
PR_APPEND_LINK(item, &aTargetList.mItems);
mList.AdjustCountsForItem(item, -1);
aTargetList.AdjustCountsForItem(item, 1);
}
void
nsCSSFrameConstructor::FrameConstructionItemList::
Iterator::AppendItemsToList(const Iterator& aEnd,
FrameConstructionItemList& aTargetList)
{
NS_ASSERTION(&aTargetList != &mList, "Unexpected call");
NS_PRECONDITION(mEnd == aEnd.mEnd, "end iterator for some other list?");
// We can't just move our guts to the other list if it already has
// some information or if we're not moving our entire list.
if (!AtStart() || !aEnd.IsDone() || !aTargetList.IsEmpty() ||
!aTargetList.mUndisplayedItems.IsEmpty()) {
do {
AppendItemToList(aTargetList);
} while (*this != aEnd);
return;
}
// move over the list of items
PR_INSERT_AFTER(&aTargetList.mItems, &mList.mItems);
// Need to init when we remove to makd ~FrameConstructionItemList work right.
PR_REMOVE_AND_INIT_LINK(&mList.mItems);
// Copy over the various counters
aTargetList.mInlineCount = mList.mInlineCount;
aTargetList.mBlockCount = mList.mBlockCount;
aTargetList.mLineParticipantCount = mList.mLineParticipantCount;
aTargetList.mItemCount = mList.mItemCount;
memcpy(aTargetList.mDesiredParentCounts, mList.mDesiredParentCounts,
sizeof(aTargetList.mDesiredParentCounts));
// Swap out undisplayed item arrays, before we nuke the array on our end
aTargetList.mUndisplayedItems.SwapElements(mList.mUndisplayedItems);
// reset mList
mList.~FrameConstructionItemList();
new (&mList) FrameConstructionItemList();
// Point ourselves to aEnd, as advertised
mCurrent = mEnd = &mList.mItems;
NS_POSTCONDITION(*this == aEnd, "How did that happen?");
}
void
nsCSSFrameConstructor::FrameConstructionItemList::
Iterator::InsertItem(FrameConstructionItem* aItem)
{
// Just insert the item before us. There's no magic here.
PR_INSERT_BEFORE(aItem, mCurrent);
mList.AdjustCountsForItem(aItem, 1);
NS_POSTCONDITION(PR_NEXT_LINK(aItem) == mCurrent, "How did that happen?");
}
void
nsCSSFrameConstructor::FrameConstructionItemList::
Iterator::DeleteItemsTo(const Iterator& aEnd)
{
NS_PRECONDITION(mEnd == aEnd.mEnd, "end iterator for some other list?");
NS_PRECONDITION(*this != aEnd, "Shouldn't be at aEnd yet");
do {
NS_ASSERTION(!IsDone(), "Ran off end of list?");
FrameConstructionItem* item = ToItem(mCurrent);
Next();
PR_REMOVE_LINK(item);
mList.AdjustCountsForItem(item, -1);
delete item;
} while (*this != aEnd);
}
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