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gecko-dev/layout/generic/nsInlineFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* rendering object for CSS display:inline objects */
#include "nsCOMPtr.h"
#include "nsInlineFrame.h"
#include "nsBlockFrame.h"
#include "nsPlaceholderFrame.h"
#include "nsGkAtoms.h"
#include "nsHTMLParts.h"
#include "nsStyleContext.h"
#include "nsIPresShell.h"
#include "nsPresContext.h"
#include "nsRenderingContext.h"
#include "nsCSSAnonBoxes.h"
#include "nsAutoPtr.h"
#include "nsFrameManager.h"
#ifdef ACCESSIBILITY
#include "nsIServiceManager.h"
#include "nsAccessibilityService.h"
#endif
#include "nsDisplayList.h"
#ifdef DEBUG
#undef NOISY_PUSHING
#endif
//////////////////////////////////////////////////////////////////////
// Basic nsInlineFrame methods
nsIFrame*
NS_NewInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsInlineFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsInlineFrame)
NS_QUERYFRAME_HEAD(nsInlineFrame)
NS_QUERYFRAME_ENTRY(nsInlineFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsInlineFrameSuper)
#ifdef DEBUG
NS_IMETHODIMP
nsInlineFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Inline"), aResult);
}
#endif
nsIAtom*
nsInlineFrame::GetType() const
{
return nsGkAtoms::inlineFrame;
}
static inline PRBool
IsMarginZero(const nsStyleCoord &aCoord)
{
return aCoord.GetUnit() == eStyleUnit_Auto ||
nsLayoutUtils::IsMarginZero(aCoord);
}
/* virtual */ PRBool
nsInlineFrame::IsSelfEmpty()
{
#if 0
// I used to think inline frames worked this way, but it seems they
// don't. At least not in our codebase.
if (GetPresContext()->CompatibilityMode() == eCompatibility_FullStandards) {
return PR_FALSE;
}
#endif
const nsStyleMargin* margin = GetStyleMargin();
const nsStyleBorder* border = GetStyleBorder();
const nsStylePadding* padding = GetStylePadding();
// XXX Top and bottom removed, since they shouldn't affect things, but this
// doesn't really match with nsLineLayout.cpp's setting of
// ZeroEffectiveSpanBox, anymore, so what should this really be?
PRBool haveRight =
border->GetActualBorderWidth(NS_SIDE_RIGHT) != 0 ||
!nsLayoutUtils::IsPaddingZero(padding->mPadding.GetRight()) ||
!IsMarginZero(margin->mMargin.GetRight());
PRBool haveLeft =
border->GetActualBorderWidth(NS_SIDE_LEFT) != 0 ||
!nsLayoutUtils::IsPaddingZero(padding->mPadding.GetLeft()) ||
!IsMarginZero(margin->mMargin.GetLeft());
if (haveLeft || haveRight) {
if (GetStateBits() & NS_FRAME_IS_SPECIAL) {
PRBool haveStart, haveEnd;
if (NS_STYLE_DIRECTION_LTR == GetStyleVisibility()->mDirection) {
haveStart = haveLeft;
haveEnd = haveRight;
} else {
haveStart = haveRight;
haveEnd = haveLeft;
}
// For special frames, ignore things we know we'll skip in GetSkipSides.
// XXXbz should we be doing this for non-special frames too, in a more
// general way?
// Get the first continuation eagerly, as a performance optimization, to
// avoid having to get it twice..
nsIFrame* firstCont = GetFirstContinuation();
return
(!haveStart || nsLayoutUtils::FrameIsNonFirstInIBSplit(firstCont)) &&
(!haveEnd || nsLayoutUtils::FrameIsNonLastInIBSplit(firstCont));
}
return PR_FALSE;
}
return PR_TRUE;
}
PRBool
nsInlineFrame::IsEmpty()
{
if (!IsSelfEmpty()) {
return PR_FALSE;
}
for (nsIFrame *kid = mFrames.FirstChild(); kid; kid = kid->GetNextSibling()) {
if (!kid->IsEmpty())
return PR_FALSE;
}
return PR_TRUE;
}
PRBool
nsInlineFrame::PeekOffsetCharacter(PRBool aForward, PRInt32* aOffset,
PRBool aRespectClusters)
{
// Override the implementation in nsFrame, to skip empty inline frames
NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
PRInt32 startOffset = *aOffset;
if (startOffset < 0)
startOffset = 1;
if (aForward == (startOffset == 0)) {
// We're before the frame and moving forward, or after it and moving backwards:
// skip to the other side, but keep going.
*aOffset = 1 - startOffset;
}
return PR_FALSE;
}
NS_IMETHODIMP
nsInlineFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
nsresult rv = nsHTMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
NS_ENSURE_SUCCESS(rv, rv);
// The sole purpose of this is to trigger display of the selection
// window for Named Anchors, which don't have any children and
// normally don't have any size, but in Editor we use CSS to display
// an image to represent this "hidden" element.
if (!mFrames.FirstChild()) {
rv = DisplaySelectionOverlay(aBuilder, aLists.Content());
}
return rv;
}
//////////////////////////////////////////////////////////////////////
// Reflow methods
/* virtual */ void
nsInlineFrame::AddInlineMinWidth(nsRenderingContext *aRenderingContext,
nsIFrame::InlineMinWidthData *aData)
{
DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::MIN_WIDTH);
}
/* virtual */ void
nsInlineFrame::AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
nsIFrame::InlinePrefWidthData *aData)
{
DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::PREF_WIDTH);
}
/* virtual */ nsSize
nsInlineFrame::ComputeSize(nsRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder, nsSize aPadding,
PRBool aShrinkWrap)
{
// Inlines and text don't compute size before reflow.
return nsSize(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsRect
nsInlineFrame::ComputeTightBounds(gfxContext* aContext) const
{
// be conservative
if (GetStyleContext()->HasTextDecorationLines()) {
return GetVisualOverflowRect();
}
return ComputeSimpleTightBounds(aContext);
}
void
nsInlineFrame::ReparentFloatsForInlineChild(nsIFrame* aOurLineContainer,
nsIFrame* aFrame,
PRBool aReparentSiblings)
{
// XXXbz this would be better if it took a nsFrameList or a frame
// list slice....
NS_ASSERTION(aOurLineContainer->GetNextContinuation() ||
aOurLineContainer->GetPrevContinuation(),
"Don't call this when we have no continuation, it's a waste");
if (!aFrame) {
NS_ASSERTION(aReparentSiblings, "Why did we get called?");
return;
}
nsIFrame* ancestor = aFrame;
nsIFrame* ancestorBlockChild;
do {
ancestorBlockChild = ancestor;
ancestor = ancestor->GetParent();
if (!ancestor)
return;
} while (!ancestor->IsFloatContainingBlock());
if (ancestor == aOurLineContainer)
return;
nsBlockFrame* ourBlock = nsLayoutUtils::GetAsBlock(aOurLineContainer);
NS_ASSERTION(ourBlock, "Not a block, but broke vertically?");
nsBlockFrame* frameBlock = nsLayoutUtils::GetAsBlock(ancestor);
NS_ASSERTION(frameBlock, "ancestor not a block");
const nsFrameList& blockChildren(ancestor->GetChildList(nsnull));
PRBool isOverflow = !blockChildren.ContainsFrame(ancestorBlockChild);
while (PR_TRUE) {
ourBlock->ReparentFloats(aFrame, frameBlock, isOverflow, PR_FALSE);
if (!aReparentSiblings)
return;
nsIFrame* next = aFrame->GetNextSibling();
if (!next)
return;
if (next->GetParent() == aFrame->GetParent()) {
aFrame = next;
continue;
}
// This is paranoid and will hardly ever get hit ... but we can't actually
// trust that the frames in the sibling chain all have the same parent,
// because lazy reparenting may be going on. If we find a different
// parent we need to redo our analysis.
ReparentFloatsForInlineChild(aOurLineContainer, next, aReparentSiblings);
return;
}
}
static void
ReparentChildListStyle(nsPresContext* aPresContext,
const nsFrameList::Slice& aFrames,
nsIFrame* aParentFrame)
{
nsFrameManager *frameManager = aPresContext->FrameManager();
for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) {
NS_ASSERTION(e.get()->GetParent() == aParentFrame, "Bogus parentage");
frameManager->ReparentStyleContext(e.get());
}
}
NS_IMETHODIMP
nsInlineFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsInlineFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
if (nsnull == aReflowState.mLineLayout) {
return NS_ERROR_INVALID_ARG;
}
PRBool lazilySetParentPointer = PR_FALSE;
nsIFrame* lineContainer = aReflowState.mLineLayout->GetLineContainerFrame();
// Check for an overflow list with our prev-in-flow
nsInlineFrame* prevInFlow = (nsInlineFrame*)GetPrevInFlow();
if (nsnull != prevInFlow) {
nsAutoPtr<nsFrameList> prevOverflowFrames(prevInFlow->StealOverflowFrames());
if (prevOverflowFrames) {
// When pushing and pulling frames we need to check for whether any
// views need to be reparented.
nsContainerFrame::ReparentFrameViewList(aPresContext,
*prevOverflowFrames,
prevInFlow, this);
// Check if we should do the lazilySetParentPointer optimization.
// Only do it in simple cases where we're being reflowed for the
// first time, nothing (e.g. bidi resolution) has already given
// us children, and there's no next-in-flow, so all our frames
// will be taken from prevOverflowFrames.
if ((GetStateBits() & NS_FRAME_FIRST_REFLOW) && mFrames.IsEmpty() &&
!GetNextInFlow()) {
// If our child list is empty, just put the new frames into it.
// Note that we don't set the parent pointer for the new frames. Instead wait
// to do this until we actually reflow the frame. If the overflow list contains
// thousands of frames this is a big performance issue (see bug #5588)
mFrames.SetFrames(*prevOverflowFrames);
lazilySetParentPointer = PR_TRUE;
} else {
// Assign all floats to our block if necessary
if (lineContainer && lineContainer->GetPrevContinuation()) {
ReparentFloatsForInlineChild(lineContainer,
prevOverflowFrames->FirstChild(),
PR_TRUE);
}
// Insert the new frames at the beginning of the child list
// and set their parent pointer
const nsFrameList::Slice& newFrames =
mFrames.InsertFrames(this, nsnull, *prevOverflowFrames);
// If our prev in flow was under the first continuation of a first-line
// frame then we need to reparent the style contexts to remove the
// the special first-line styling. In the lazilySetParentPointer case
// we reparent the style contexts when we set their parents in
// nsInlineFrame::ReflowFrames and nsInlineFrame::ReflowInlineFrame.
if (aReflowState.mLineLayout->GetInFirstLine()) {
ReparentChildListStyle(aPresContext, newFrames, this);
}
}
}
}
// It's also possible that we have an overflow list for ourselves
#ifdef DEBUG
if (GetStateBits() & NS_FRAME_FIRST_REFLOW) {
// If it's our initial reflow, then we should not have an overflow list.
// However, add an assertion in case we get reflowed more than once with
// the initial reflow reason
nsFrameList* overflowFrames = GetOverflowFrames();
NS_ASSERTION(!overflowFrames || overflowFrames->IsEmpty(),
"overflow list is not empty for initial reflow");
}
#endif
if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
nsAutoPtr<nsFrameList> overflowFrames(StealOverflowFrames());
if (overflowFrames) {
NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
// Because we lazily set the parent pointer of child frames we get from
// our prev-in-flow's overflow list, it's possible that we have not set
// the parent pointer for these frames.
mFrames.AppendFrames(this, *overflowFrames);
}
}
if (IsFrameTreeTooDeep(aReflowState, aMetrics, aStatus)) {
return NS_OK;
}
// Set our own reflow state (additional state above and beyond
// aReflowState)
InlineReflowState irs;
irs.mPrevFrame = nsnull;
irs.mLineContainer = lineContainer;
irs.mLineLayout = aReflowState.mLineLayout;
irs.mNextInFlow = (nsInlineFrame*) GetNextInFlow();
irs.mSetParentPointer = lazilySetParentPointer;
nsresult rv;
if (mFrames.IsEmpty()) {
// Try to pull over one frame before starting so that we know
// whether we have an anonymous block or not.
PRBool complete;
(void) PullOneFrame(aPresContext, irs, &complete);
}
rv = ReflowFrames(aPresContext, aReflowState, irs, aMetrics, aStatus);
ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowState, aStatus);
// Note: the line layout code will properly compute our
// overflow-rect state for us.
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
return rv;
}
/* virtual */ PRBool
nsInlineFrame::CanContinueTextRun() const
{
// We can continue a text run through an inline frame
return PR_TRUE;
}
/* virtual */ void
nsInlineFrame::PullOverflowsFromPrevInFlow()
{
nsInlineFrame* prevInFlow = static_cast<nsInlineFrame*>(GetPrevInFlow());
if (prevInFlow) {
nsAutoPtr<nsFrameList> prevOverflowFrames(prevInFlow->StealOverflowFrames());
if (prevOverflowFrames) {
// Assume that our prev-in-flow has the same line container that we do.
nsContainerFrame::ReparentFrameViewList(PresContext(),
*prevOverflowFrames,
prevInFlow, this);
mFrames.InsertFrames(this, nsnull, *prevOverflowFrames);
}
}
}
nsresult
nsInlineFrame::ReflowFrames(nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
InlineReflowState& irs,
nsHTMLReflowMetrics& aMetrics,
nsReflowStatus& aStatus)
{
nsresult rv = NS_OK;
aStatus = NS_FRAME_COMPLETE;
nsLineLayout* lineLayout = aReflowState.mLineLayout;
PRBool inFirstLine = aReflowState.mLineLayout->GetInFirstLine();
nsFrameManager* frameManager = aPresContext->FrameManager();
PRBool ltr = (NS_STYLE_DIRECTION_LTR == aReflowState.mStyleVisibility->mDirection);
nscoord leftEdge = 0;
// Don't offset by our start borderpadding if we have a prev continuation or
// if we're in a part of an {ib} split other than the first one.
if (!GetPrevContinuation() &&
!nsLayoutUtils::FrameIsNonFirstInIBSplit(this)) {
leftEdge = ltr ? aReflowState.mComputedBorderPadding.left
: aReflowState.mComputedBorderPadding.right;
}
nscoord availableWidth = aReflowState.availableWidth;
NS_ASSERTION(availableWidth != NS_UNCONSTRAINEDSIZE,
"should no longer use available widths");
// Subtract off left and right border+padding from availableWidth
availableWidth -= leftEdge;
availableWidth -= ltr ? aReflowState.mComputedBorderPadding.right
: aReflowState.mComputedBorderPadding.left;
lineLayout->BeginSpan(this, &aReflowState, leftEdge, leftEdge + availableWidth);
// First reflow our current children
nsIFrame* frame = mFrames.FirstChild();
PRBool done = PR_FALSE;
while (nsnull != frame) {
PRBool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
// Check if we should lazily set the child frame's parent pointer
if (irs.mSetParentPointer) {
PRBool havePrevBlock =
irs.mLineContainer && irs.mLineContainer->GetPrevContinuation();
// If our block is the first in flow, then any floats under the pulled
// frame must already belong to our block.
if (havePrevBlock) {
// This has to happen before we update frame's parent; we need to
// know frame's ancestry under its old block.
// The blockChildren.ContainsFrame check performed by
// ReparentFloatsForInlineChild here may be slow, but we can't
// easily avoid it because we don't know where 'frame' originally
// came from. If we really really have to optimize this we could
// cache whether frame->GetParent() is under its containing blocks
// overflowList or not.
ReparentFloatsForInlineChild(irs.mLineContainer, frame, PR_FALSE);
}
frame->SetParent(this);
if (inFirstLine) {
frameManager->ReparentStyleContext(frame);
}
// We also need to check if frame has a next-in-flow. If it does, then set
// its parent frame pointer, too. Otherwise, if we reflow frame and it's
// complete we'll fail when deleting its next-in-flow which is no longer
// needed. This scenario doesn't happen often, but it can happen
nsIFrame* nextInFlow = frame->GetNextInFlow();
for ( ; nextInFlow; nextInFlow = nextInFlow->GetNextInFlow()) {
// Since we only do lazy setting of parent pointers for the frame's
// initial reflow, this frame can't have a next-in-flow. That means
// the continuing child frame must be in our child list as well. If
// not, then something is wrong
NS_ASSERTION(mFrames.ContainsFrame(nextInFlow), "unexpected flow");
if (havePrevBlock) {
ReparentFloatsForInlineChild(irs.mLineContainer, nextInFlow, PR_FALSE);
}
nextInFlow->SetParent(this);
if (inFirstLine) {
frameManager->ReparentStyleContext(nextInFlow);
}
}
// Fix the parent pointer for ::first-letter child frame next-in-flows,
// so nsFirstLetterFrame::Reflow can destroy them safely (bug 401042).
nsIFrame* realFrame = nsPlaceholderFrame::GetRealFrameFor(frame);
if (realFrame->GetType() == nsGkAtoms::letterFrame) {
nsIFrame* child = realFrame->GetFirstChild(nsnull);
if (child) {
NS_ASSERTION(child->GetType() == nsGkAtoms::textFrame,
"unexpected frame type");
nsIFrame* nextInFlow = child->GetNextInFlow();
for ( ; nextInFlow; nextInFlow = nextInFlow->GetNextInFlow()) {
NS_ASSERTION(nextInFlow->GetType() == nsGkAtoms::textFrame,
"unexpected frame type");
if (mFrames.ContainsFrame(nextInFlow)) {
nextInFlow->SetParent(this);
if (inFirstLine) {
frameManager->ReparentStyleContext(nextInFlow);
}
}
else {
#ifdef DEBUG
// Once we find a next-in-flow that isn't ours none of the
// remaining next-in-flows should be either.
for ( ; nextInFlow; nextInFlow = nextInFlow->GetNextInFlow()) {
NS_ASSERTION(!mFrames.ContainsFrame(nextInFlow),
"unexpected letter frame flow");
}
#endif
break;
}
}
}
}
}
rv = ReflowInlineFrame(aPresContext, aReflowState, irs, frame, aStatus);
if (NS_FAILED(rv)) {
done = PR_TRUE;
break;
}
if (NS_INLINE_IS_BREAK(aStatus) ||
(!reflowingFirstLetter && NS_FRAME_IS_NOT_COMPLETE(aStatus))) {
done = PR_TRUE;
break;
}
irs.mPrevFrame = frame;
frame = frame->GetNextSibling();
}
// Attempt to pull frames from our next-in-flow until we can't
if (!done && (nsnull != GetNextInFlow())) {
while (!done) {
PRBool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
PRBool isComplete;
if (!frame) { // Could be non-null if we pulled a first-letter frame and
// it created a continuation, since we don't push those.
frame = PullOneFrame(aPresContext, irs, &isComplete);
}
#ifdef NOISY_PUSHING
printf("%p pulled up %p\n", this, frame);
#endif
if (nsnull == frame) {
if (!isComplete) {
aStatus = NS_FRAME_NOT_COMPLETE;
}
break;
}
rv = ReflowInlineFrame(aPresContext, aReflowState, irs, frame, aStatus);
if (NS_FAILED(rv)) {
done = PR_TRUE;
break;
}
if (NS_INLINE_IS_BREAK(aStatus) ||
(!reflowingFirstLetter && NS_FRAME_IS_NOT_COMPLETE(aStatus))) {
done = PR_TRUE;
break;
}
irs.mPrevFrame = frame;
frame = frame->GetNextSibling();
}
}
#ifdef DEBUG
if (NS_FRAME_IS_COMPLETE(aStatus)) {
// We can't be complete AND have overflow frames!
NS_ASSERTION(!GetOverflowFrames(), "whoops");
}
#endif
// If after reflowing our children they take up no area then make
// sure that we don't either.
//
// Note: CSS demands that empty inline elements still affect the
// line-height calculations. However, continuations of an inline
// that are empty we force to empty so that things like collapsed
// whitespace in an inline element don't affect the line-height.
aMetrics.width = lineLayout->EndSpan(this);
// Compute final width.
// Make sure to not include our start border and padding if we have a prev
// continuation or if we're in a part of an {ib} split other than the first
// one.
if (!GetPrevContinuation() &&
!nsLayoutUtils::FrameIsNonFirstInIBSplit(this)) {
aMetrics.width += ltr ? aReflowState.mComputedBorderPadding.left
: aReflowState.mComputedBorderPadding.right;
}
/*
* We want to only apply the end border and padding if we're the last
* continuation and either not in an {ib} split or the last part of it. To
* be the last continuation we have to be complete (so that we won't get a
* next-in-flow) and have no non-fluid continuations on our continuation
* chain.
*/
if (NS_FRAME_IS_COMPLETE(aStatus) &&
!GetLastInFlow()->GetNextContinuation() &&
!nsLayoutUtils::FrameIsNonLastInIBSplit(this)) {
aMetrics.width += ltr ? aReflowState.mComputedBorderPadding.right
: aReflowState.mComputedBorderPadding.left;
}
nsLayoutUtils::SetFontFromStyle(aReflowState.rendContext, mStyleContext);
nsFontMetrics* fm = aReflowState.rendContext->FontMetrics();
if (fm) {
// Compute final height of the frame.
//
// Do things the standard css2 way -- though it's hard to find it
// in the css2 spec! It's actually found in the css1 spec section
// 4.4 (you will have to read between the lines to really see
// it).
//
// The height of our box is the sum of our font size plus the top
// and bottom border and padding. The height of children do not
// affect our height.
aMetrics.ascent = fm->MaxAscent();
aMetrics.height = fm->MaxHeight();
} else {
NS_WARNING("Cannot get font metrics - defaulting sizes to 0");
aMetrics.ascent = aMetrics.height = 0;
}
aMetrics.ascent += aReflowState.mComputedBorderPadding.top;
aMetrics.height += aReflowState.mComputedBorderPadding.top +
aReflowState.mComputedBorderPadding.bottom;
// For now our overflow area is zero. The real value will be
// computed in |nsLineLayout::RelativePositionFrames|.
aMetrics.mOverflowAreas.Clear();
#ifdef NOISY_FINAL_SIZE
ListTag(stdout);
printf(": metrics=%d,%d ascent=%d\n",
aMetrics.width, aMetrics.height, aMetrics.ascent);
#endif
return rv;
}
nsresult
nsInlineFrame::ReflowInlineFrame(nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
InlineReflowState& irs,
nsIFrame* aFrame,
nsReflowStatus& aStatus)
{
nsLineLayout* lineLayout = aReflowState.mLineLayout;
PRBool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
PRBool pushedFrame;
nsresult rv =
lineLayout->ReflowFrame(aFrame, aStatus, nsnull, pushedFrame);
if (NS_FAILED(rv)) {
return rv;
}
if (NS_INLINE_IS_BREAK_BEFORE(aStatus)) {
if (aFrame != mFrames.FirstChild()) {
// Change break-before status into break-after since we have
// already placed at least one child frame. This preserves the
// break-type so that it can be propagated upward.
aStatus = NS_FRAME_NOT_COMPLETE |
NS_INLINE_BREAK | NS_INLINE_BREAK_AFTER |
(aStatus & NS_INLINE_BREAK_TYPE_MASK);
PushFrames(aPresContext, aFrame, irs.mPrevFrame, irs);
}
else {
// Preserve reflow status when breaking-before our first child
// and propagate it upward without modification.
// Note: if we're lazily setting the frame pointer for our child
// frames, then we need to set it now. Don't return and leave the
// remaining child frames in our child list with the wrong parent
// frame pointer...
if (irs.mSetParentPointer) {
if (irs.mLineContainer && irs.mLineContainer->GetPrevContinuation()) {
ReparentFloatsForInlineChild(irs.mLineContainer, aFrame->GetNextSibling(),
PR_TRUE);
}
for (nsIFrame* f = aFrame->GetNextSibling(); f; f = f->GetNextSibling()) {
f->SetParent(this);
if (lineLayout->GetInFirstLine()) {
aPresContext->FrameManager()->ReparentStyleContext(f);
}
}
}
}
return NS_OK;
}
// Create a next-in-flow if needed.
if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus)) {
nsIFrame* newFrame;
rv = CreateNextInFlow(aPresContext, aFrame, newFrame);
if (NS_FAILED(rv)) {
return rv;
}
}
if (NS_INLINE_IS_BREAK_AFTER(aStatus)) {
nsIFrame* nextFrame = aFrame->GetNextSibling();
if (nextFrame) {
NS_FRAME_SET_INCOMPLETE(aStatus);
PushFrames(aPresContext, nextFrame, aFrame, irs);
}
else {
// We must return an incomplete status if there are more child
// frames remaining in a next-in-flow that follows this frame.
nsInlineFrame* nextInFlow = static_cast<nsInlineFrame*>(GetNextInFlow());
while (nextInFlow) {
if (nextInFlow->mFrames.NotEmpty()) {
NS_FRAME_SET_INCOMPLETE(aStatus);
break;
}
nextInFlow = static_cast<nsInlineFrame*>(nextInFlow->GetNextInFlow());
}
}
return NS_OK;
}
if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus) && !reflowingFirstLetter) {
nsIFrame* nextFrame = aFrame->GetNextSibling();
if (nextFrame) {
PushFrames(aPresContext, nextFrame, aFrame, irs);
}
}
return NS_OK;
}
nsIFrame*
nsInlineFrame::PullOneFrame(nsPresContext* aPresContext,
InlineReflowState& irs,
PRBool* aIsComplete)
{
PRBool isComplete = PR_TRUE;
nsIFrame* frame = nsnull;
nsInlineFrame* nextInFlow = irs.mNextInFlow;
while (nsnull != nextInFlow) {
frame = nextInFlow->mFrames.FirstChild();
if (!frame) {
// If the principal childlist has no frames, then try moving the overflow
// frames to it.
nsAutoPtr<nsFrameList> overflowFrames(nextInFlow->StealOverflowFrames());
if (overflowFrames) {
nextInFlow->mFrames.SetFrames(*overflowFrames);
frame = nextInFlow->mFrames.FirstChild();
}
}
if (nsnull != frame) {
// If our block has no next continuation, then any floats belonging to
// the pulled frame must belong to our block already. This check ensures
// we do no extra work in the common non-vertical-breaking case.
if (irs.mLineContainer && irs.mLineContainer->GetNextContinuation()) {
// The blockChildren.ContainsFrame check performed by
// ReparentFloatsForInlineChild will be fast because frame's ancestor
// will be the first child of its containing block.
ReparentFloatsForInlineChild(irs.mLineContainer, frame, PR_FALSE);
}
nextInFlow->mFrames.RemoveFirstChild();
// If we removed the last frame from the principal child list then move
// any overflow frames to it.
if (!nextInFlow->mFrames.FirstChild()) {
nsAutoPtr<nsFrameList> overflowFrames(nextInFlow->StealOverflowFrames());
if (overflowFrames) {
nextInFlow->mFrames.SetFrames(*overflowFrames);
}
}
mFrames.InsertFrame(this, irs.mPrevFrame, frame);
isComplete = PR_FALSE;
if (irs.mLineLayout) {
irs.mLineLayout->SetDirtyNextLine();
}
nsContainerFrame::ReparentFrameView(aPresContext, frame, nextInFlow, this);
break;
}
nextInFlow = (nsInlineFrame*) nextInFlow->GetNextInFlow();
irs.mNextInFlow = nextInFlow;
}
*aIsComplete = isComplete;
return frame;
}
void
nsInlineFrame::PushFrames(nsPresContext* aPresContext,
nsIFrame* aFromChild,
nsIFrame* aPrevSibling,
InlineReflowState& aState)
{
NS_PRECONDITION(aFromChild, "null pointer");
NS_PRECONDITION(aPrevSibling, "pushing first child");
NS_PRECONDITION(aPrevSibling->GetNextSibling() == aFromChild, "bad prev sibling");
#ifdef NOISY_PUSHING
printf("%p pushing aFromChild %p, disconnecting from prev sib %p\n",
this, aFromChild, aPrevSibling);
#endif
// Add the frames to our overflow list (let our next in flow drain
// our overflow list when it is ready)
SetOverflowFrames(aPresContext, mFrames.RemoveFramesAfter(aPrevSibling));
if (aState.mLineLayout) {
aState.mLineLayout->SetDirtyNextLine();
}
}
//////////////////////////////////////////////////////////////////////
PRIntn
nsInlineFrame::GetSkipSides() const
{
PRIntn skip = 0;
if (!IsLeftMost()) {
nsInlineFrame* prev = (nsInlineFrame*) GetPrevContinuation();
if ((GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET) ||
(prev && (prev->mRect.height || prev->mRect.width))) {
// Prev continuation is not empty therefore we don't render our left
// border edge.
skip |= 1 << NS_SIDE_LEFT;
}
else {
// If the prev continuation is empty, then go ahead and let our left
// edge border render.
}
}
if (!IsRightMost()) {
nsInlineFrame* next = (nsInlineFrame*) GetNextContinuation();
if ((GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET) ||
(next && (next->mRect.height || next->mRect.width))) {
// Next continuation is not empty therefore we don't render our right
// border edge.
skip |= 1 << NS_SIDE_RIGHT;
}
else {
// If the next continuation is empty, then go ahead and let our right
// edge border render.
}
}
if (GetStateBits() & NS_FRAME_IS_SPECIAL) {
// All but the last part of an {ib} split should skip the "end" side (as
// determined by this frame's direction) and all but the first part of such
// a split should skip the "start" side. But figuring out which part of
// the split we are involves getting our first continuation, which might be
// expensive. So don't bother if we already have the relevant bits set.
PRBool ltr = (NS_STYLE_DIRECTION_LTR == GetStyleVisibility()->mDirection);
PRIntn startBit = (1 << (ltr ? NS_SIDE_LEFT : NS_SIDE_RIGHT));
PRIntn endBit = (1 << (ltr ? NS_SIDE_RIGHT : NS_SIDE_LEFT));
if (((startBit | endBit) & skip) != (startBit | endBit)) {
// We're missing one of the skip bits, so check whether we need to set it.
// Only get the first continuation once, as an optimization.
nsIFrame* firstContinuation = GetFirstContinuation();
if (nsLayoutUtils::FrameIsNonLastInIBSplit(firstContinuation)) {
skip |= endBit;
}
if (nsLayoutUtils::FrameIsNonFirstInIBSplit(firstContinuation)) {
skip |= startBit;
}
}
}
return skip;
}
nscoord
nsInlineFrame::GetBaseline() const
{
nscoord ascent = 0;
nsRefPtr<nsFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
if (fm) {
ascent = fm->MaxAscent();
}
return NS_MIN(mRect.height, ascent + GetUsedBorderAndPadding().top);
}
void
nsInlineFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
DestroyAbsoluteFrames(aDestructRoot);
nsInlineFrameSuper::DestroyFrom(aDestructRoot);
}
#ifdef ACCESSIBILITY
already_AddRefed<nsAccessible>
nsInlineFrame::CreateAccessible()
{
// Broken image accessibles are created here, because layout
// replaces the image or image control frame with an inline frame
nsIAtom *tagAtom = mContent->Tag();
if ((tagAtom == nsGkAtoms::img || tagAtom == nsGkAtoms::input ||
tagAtom == nsGkAtoms::label) && mContent->IsHTML()) {
// Only get accessibility service if we're going to use it
nsAccessibilityService* accService = nsIPresShell::AccService();
if (!accService)
return nsnull;
if (tagAtom == nsGkAtoms::input) // Broken <input type=image ... />
return accService->CreateHTMLButtonAccessible(mContent,
PresContext()->PresShell());
else if (tagAtom == nsGkAtoms::img) // Create accessible for broken <img>
return accService->CreateHTMLImageAccessible(mContent,
PresContext()->PresShell());
else if (tagAtom == nsGkAtoms::label) // Creat accessible for <label>
return accService->CreateHTMLLabelAccessible(mContent,
PresContext()->PresShell());
}
return nsnull;
}
#endif
//////////////////////////////////////////////////////////////////////
// nsLineFrame implementation
nsIFrame*
NS_NewFirstLineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsFirstLineFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsFirstLineFrame)
#ifdef DEBUG
NS_IMETHODIMP
nsFirstLineFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Line"), aResult);
}
#endif
nsIAtom*
nsFirstLineFrame::GetType() const
{
return nsGkAtoms::lineFrame;
}
nsIFrame*
nsFirstLineFrame::PullOneFrame(nsPresContext* aPresContext, InlineReflowState& irs,
PRBool* aIsComplete)
{
nsIFrame* frame = nsInlineFrame::PullOneFrame(aPresContext, irs, aIsComplete);
if (frame && !GetPrevInFlow()) {
// We are a first-line frame. Fixup the child frames
// style-context that we just pulled.
NS_ASSERTION(frame->GetParent() == this, "Incorrect parent?");
aPresContext->FrameManager()->ReparentStyleContext(frame);
}
return frame;
}
NS_IMETHODIMP
nsFirstLineFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
if (nsnull == aReflowState.mLineLayout) {
return NS_ERROR_INVALID_ARG;
}
nsIFrame* lineContainer = aReflowState.mLineLayout->GetLineContainerFrame();
// Check for an overflow list with our prev-in-flow
nsFirstLineFrame* prevInFlow = (nsFirstLineFrame*)GetPrevInFlow();
if (nsnull != prevInFlow) {
nsAutoPtr<nsFrameList> prevOverflowFrames(prevInFlow->StealOverflowFrames());
if (prevOverflowFrames) {
// Assign all floats to our block if necessary
if (lineContainer && lineContainer->GetPrevContinuation()) {
ReparentFloatsForInlineChild(lineContainer,
prevOverflowFrames->FirstChild(),
PR_TRUE);
}
const nsFrameList::Slice& newFrames =
mFrames.InsertFrames(this, nsnull, *prevOverflowFrames);
ReparentChildListStyle(aPresContext, newFrames, this);
}
}
// It's also possible that we have an overflow list for ourselves
nsAutoPtr<nsFrameList> overflowFrames(StealOverflowFrames());
if (overflowFrames) {
NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
const nsFrameList::Slice& newFrames =
mFrames.AppendFrames(nsnull, *overflowFrames);
ReparentChildListStyle(aPresContext, newFrames, this);
}
// Set our own reflow state (additional state above and beyond
// aReflowState)
InlineReflowState irs;
irs.mPrevFrame = nsnull;
irs.mLineContainer = lineContainer;
irs.mLineLayout = aReflowState.mLineLayout;
irs.mNextInFlow = (nsInlineFrame*) GetNextInFlow();
nsresult rv;
PRBool wasEmpty = mFrames.IsEmpty();
if (wasEmpty) {
// Try to pull over one frame before starting so that we know
// whether we have an anonymous block or not.
PRBool complete;
PullOneFrame(aPresContext, irs, &complete);
}
if (nsnull == GetPrevInFlow()) {
// XXX This is pretty sick, but what we do here is to pull-up, in
// advance, all of the next-in-flows children. We re-resolve their
// style while we are at at it so that when we reflow they have
// the right style.
//
// All of this is so that text-runs reflow properly.
irs.mPrevFrame = mFrames.LastChild();
for (;;) {
PRBool complete;
nsIFrame* frame = PullOneFrame(aPresContext, irs, &complete);
if (!frame) {
break;
}
irs.mPrevFrame = frame;
}
irs.mPrevFrame = nsnull;
}
else {
// XXX do this in the Init method instead
// For continuations, we need to check and see if our style
// context is right. If its the same as the first-in-flow, then
// we need to fix it up (that way :first-line style doesn't leak
// into this continuation since we aren't the first line).
nsFirstLineFrame* first = (nsFirstLineFrame*) GetFirstInFlow();
if (mStyleContext == first->mStyleContext) {
// Fixup our style context and our children. First get the
// proper parent context.
nsStyleContext* parentContext = first->GetParent()->GetStyleContext();
if (parentContext) {
// Create a new style context that is a child of the parent
// style context thus removing the :first-line style. This way
// we behave as if an anonymous (unstyled) span was the child
// of the parent frame.
nsRefPtr<nsStyleContext> newSC;
newSC = aPresContext->StyleSet()->
ResolveAnonymousBoxStyle(nsCSSAnonBoxes::mozLineFrame, parentContext);
if (newSC) {
// Switch to the new style context.
SetStyleContext(newSC);
// Re-resolve all children
ReparentChildListStyle(aPresContext, mFrames, this);
}
}
}
}
NS_ASSERTION(!aReflowState.mLineLayout->GetInFirstLine(),
"Nested first-line frames? BOGUS");
aReflowState.mLineLayout->SetInFirstLine(PR_TRUE);
rv = ReflowFrames(aPresContext, aReflowState, irs, aMetrics, aStatus);
aReflowState.mLineLayout->SetInFirstLine(PR_FALSE);
ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowState, aStatus);
// Note: the line layout code will properly compute our overflow state for us
return rv;
}
/* virtual */ void
nsFirstLineFrame::PullOverflowsFromPrevInFlow()
{
nsFirstLineFrame* prevInFlow = static_cast<nsFirstLineFrame*>(GetPrevInFlow());
if (prevInFlow) {
nsAutoPtr<nsFrameList> prevOverflowFrames(prevInFlow->StealOverflowFrames());
if (prevOverflowFrames) {
// Assume that our prev-in-flow has the same line container that we do.
const nsFrameList::Slice& newFrames =
mFrames.InsertFrames(this, nsnull, *prevOverflowFrames);
ReparentChildListStyle(PresContext(), newFrames, this);
}
}
}
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