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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 "nsHTMLAtoms.h"
#include "nsHTMLParts.h"
#include "nsStyleContext.h"
#include "nsIPresShell.h"
#include "nsPresContext.h"
#include "nsIRenderingContext.h"
#include "nsIFontMetrics.h"
#include "nsAbsoluteContainingBlock.h"
#include "nsLayoutAtoms.h"
#include "nsCSSAnonBoxes.h"
#include "nsReflowPath.h"
#include "nsAutoPtr.h"
#include "nsFrameManager.h"
#ifdef ACCESSIBILITY
#include "nsIServiceManager.h"
#include "nsIAccessibilityService.h"
#endif
#include "nsDisplayList.h"
#ifdef DEBUG
#undef NOISY_PUSHING
#endif
NS_DEFINE_IID(kInlineFrameCID, NS_INLINE_FRAME_CID);
//////////////////////////////////////////////////////////////////////
// Basic nsInlineFrame methods
nsIFrame*
NS_NewInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsInlineFrame(aContext);
}
NS_IMETHODIMP
nsInlineFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
if (nsnull == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if (aIID.Equals(kInlineFrameCID)) {
nsInlineFrame* tmp = this;
*aInstancePtr = (void*) tmp;
return NS_OK;
}
return nsInlineFrameSuper::QueryInterface(aIID, aInstancePtr);
}
#ifdef DEBUG
NS_IMETHODIMP
nsInlineFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Inline"), aResult);
}
#endif
nsIAtom*
nsInlineFrame::GetType() const
{
return nsLayoutAtoms::inlineFrame;
}
inline PRBool
IsPaddingZero(nsStyleUnit aUnit, nsStyleCoord &aCoord)
{
return (aUnit == eStyleUnit_Null ||
(aUnit == eStyleUnit_Coord && aCoord.GetCoordValue() == 0) ||
(aUnit == eStyleUnit_Percent && aCoord.GetPercentValue() == 0.0));
}
inline PRBool
IsMarginZero(nsStyleUnit aUnit, nsStyleCoord &aCoord)
{
return (aUnit == eStyleUnit_Null ||
aUnit == eStyleUnit_Auto ||
(aUnit == eStyleUnit_Coord && aCoord.GetCoordValue() == 0) ||
(aUnit == eStyleUnit_Percent && aCoord.GetPercentValue() == 0.0));
}
/* 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();
nsStyleCoord coord;
// 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?
if (border->GetBorderWidth(NS_SIDE_RIGHT) != 0 ||
border->GetBorderWidth(NS_SIDE_LEFT) != 0 ||
!IsPaddingZero(padding->mPadding.GetRightUnit(),
padding->mPadding.GetRight(coord)) ||
!IsPaddingZero(padding->mPadding.GetLeftUnit(),
padding->mPadding.GetLeft(coord)) ||
!IsMarginZero(margin->mMargin.GetRightUnit(),
margin->mMargin.GetRight(coord)) ||
!IsMarginZero(margin->mMargin.GetLeftUnit(),
margin->mMargin.GetLeft(coord))) {
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;
}
NS_IMETHODIMP
nsInlineFrame::AppendFrames(nsIAtom* aListName,
nsIFrame* aFrameList)
{
if (nsnull != aListName) {
#ifdef IBMBIDI
if (aListName != nsLayoutAtoms::nextBidi)
#endif
{
NS_ERROR("unexpected child list");
return NS_ERROR_INVALID_ARG;
}
}
if (aFrameList) {
mFrames.AppendFrames(this, aFrameList);
// Ask the parent frame to reflow me.
#ifdef IBMBIDI
if (nsnull == aListName)
#endif
ReflowDirtyChild(GetPresContext()->PresShell(), nsnull);
}
return NS_OK;
}
NS_IMETHODIMP
nsInlineFrame::InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList)
{
NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == this,
"inserting after sibling frame with different parent");
if (nsnull != aListName) {
#ifdef IBMBIDI
if (aListName != nsLayoutAtoms::nextBidi)
#endif
{
NS_ERROR("unexpected child list");
return NS_ERROR_INVALID_ARG;
}
}
if (aFrameList) {
// Insert frames after aPrevFrame
mFrames.InsertFrames(this, aPrevFrame, aFrameList);
#ifdef IBMBIDI
if (nsnull == aListName)
#endif
// Ask the parent frame to reflow me.
ReflowDirtyChild(GetPresContext()->PresShell(), nsnull);
}
return NS_OK;
}
NS_IMETHODIMP
nsInlineFrame::RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame)
{
if (nsnull != aListName) {
#ifdef IBMBIDI
if (nsLayoutAtoms::nextBidi != aListName)
#endif
{
NS_ERROR("unexpected child list");
return NS_ERROR_INVALID_ARG;
}
}
if (aOldFrame) {
// Loop and destroy the frame and all of its continuations.
// If the frame we are removing is a brFrame, we need a reflow so
// the line the brFrame was on can attempt to pull up any frames
// that can fit from lines below it.
PRBool generateReflowCommand =
aOldFrame->GetType() == nsLayoutAtoms::brFrame;
nsInlineFrame* parent = NS_STATIC_CAST(nsInlineFrame*, aOldFrame->GetParent());
while (aOldFrame) {
#ifdef IBMBIDI
if (nsLayoutAtoms::nextBidi != aListName) {
#endif
// If the frame being removed has zero size then don't bother
// generating a reflow command, otherwise make sure we do.
nsRect bbox = aOldFrame->GetRect();
if (bbox.width || bbox.height) {
generateReflowCommand = PR_TRUE;
}
#ifdef IBMBIDI
}
#endif
// When the parent is an inline frame we have a simple task - just
// remove the frame from its parents list and generate a reflow
// command.
nsIFrame* oldFrameNextContinuation = aOldFrame->GetNextContinuation();
parent->mFrames.DestroyFrame(aOldFrame);
aOldFrame = oldFrameNextContinuation;
if (aOldFrame) {
parent = NS_STATIC_CAST(nsInlineFrame*, aOldFrame->GetParent());
}
}
if (generateReflowCommand) {
// Ask the parent frame to reflow me.
ReflowDirtyChild(GetPresContext()->PresShell(), nsnull);
}
}
return NS_OK;
}
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);
}
return rv;
}
//////////////////////////////////////////////////////////////////////
// Reflow methods
NS_IMETHODIMP
nsInlineFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsInlineFrame", aReflowState.reason);
DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
if (nsnull == aReflowState.mLineLayout) {
return NS_ERROR_INVALID_ARG;
}
PRBool lazilySetParentPointer = PR_FALSE;
// Check for an overflow list with our prev-in-flow
nsInlineFrame* prevInFlow = (nsInlineFrame*)GetPrevInFlow();
if (nsnull != prevInFlow) {
nsIFrame* prevOverflowFrames = prevInFlow->GetOverflowFrames(aPresContext, PR_TRUE);
if (prevOverflowFrames) {
// When pushing and pulling frames we need to check for whether any
// views need to be reparented.
nsHTMLContainerFrame::ReparentFrameViewList(aPresContext, prevOverflowFrames,
prevInFlow, this);
if (aReflowState.reason == eReflowReason_Initial) {
// If it's the initial reflow, then our child list must be empty, so
// just set the child list rather than calling InsertFrame(). This avoids
// having to get the last child frame in the list.
// 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)
NS_ASSERTION(mFrames.IsEmpty(), "child list is not empty for initial reflow");
mFrames.SetFrames(prevOverflowFrames);
lazilySetParentPointer = PR_TRUE;
} else {
// Insert the new frames at the beginning of the child list
// and set their parent pointer
mFrames.InsertFrames(this, nsnull, prevOverflowFrames);
}
}
}
// It's also possible that we have an overflow list for ourselves
#ifdef DEBUG
if (aReflowState.reason == eReflowReason_Initial) {
// 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
nsIFrame* overflowFrames = GetOverflowFrames(aPresContext, PR_FALSE);
NS_ASSERTION(!overflowFrames, "overflow list is not empty for initial reflow");
}
#endif
if (aReflowState.reason != eReflowReason_Initial) {
nsIFrame* overflowFrames = GetOverflowFrames(aPresContext, PR_TRUE);
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. Check the first frame to see, and
// if we haven't set the parent pointer then set it now
mFrames.AppendFrames(overflowFrames->GetParent() == this ? nsnull : this, overflowFrames);
}
}
if (IsFrameTreeTooDeep(aReflowState, aMetrics)) {
#ifdef DEBUG_kipp
{
extern char* nsPresShell_ReflowStackPointerTop;
char marker;
char* newsp = (char*) ▮
printf("XXX: frame tree is too deep; approx stack size = %d\n",
nsPresShell_ReflowStackPointerTop - newsp);
}
#endif
aStatus = NS_FRAME_COMPLETE;
return NS_OK;
}
// Set our own reflow state (additional state above and beyond
// aReflowState)
InlineReflowState irs;
irs.mPrevFrame = nsnull;
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);
// Note: the line layout code will properly compute our
// NS_FRAME_OUTSIDE_CHILDREN state for us.
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
return rv;
}
NS_IMETHODIMP
nsInlineFrame::CanContinueTextRun(PRBool& aContinueTextRun) const
{
// We can continue a text run through an inline frame
aContinueTextRun = PR_TRUE;
return NS_OK;
}
NS_IMETHODIMP
nsInlineFrame::ReflowDirtyChild(nsIPresShell* aPresShell, nsIFrame* aChild)
{
// The inline container frame does not handle the reflow
// request. It passes it up to its parent container.
// If you don't already have dirty children,
if (!(mState & NS_FRAME_HAS_DIRTY_CHILDREN)) {
if (mParent) {
// Record that you are dirty and have dirty children
mState |= NS_FRAME_IS_DIRTY;
mState |= NS_FRAME_HAS_DIRTY_CHILDREN;
// Pass the reflow request up to the parent
mParent->ReflowDirtyChild(aPresShell, this);
}
else {
NS_ERROR("No parent to pass the reflow request up to.");
}
}
return NS_OK;
}
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 ltr = (NS_STYLE_DIRECTION_LTR == aReflowState.mStyleVisibility->mDirection);
nscoord leftEdge = 0;
if (nsnull == GetPrevContinuation()) {
leftEdge = ltr ? aReflowState.mComputedBorderPadding.left
: aReflowState.mComputedBorderPadding.right;
}
nscoord availableWidth = aReflowState.availableWidth;
if (NS_UNCONSTRAINEDSIZE != availableWidth) {
// Subtract off left and right border+padding from availableWidth
availableWidth -= leftEdge;
availableWidth -= ltr ? aReflowState.mComputedBorderPadding.right
: aReflowState.mComputedBorderPadding.left;
availableWidth = PR_MAX(0, availableWidth);
}
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) {
frame->SetParent(this);
// 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();
while (nextInFlow) {
// 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");
nextInFlow->SetParent(this);
nextInFlow = nextInFlow->GetNextInFlow();
}
}
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;
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;
}
}
#ifdef DEBUG
if (NS_FRAME_IS_COMPLETE(aStatus)) {
// We can't be complete AND have overflow frames!
nsIFrame* overflowFrames = GetOverflowFrames(aPresContext, PR_FALSE);
NS_ASSERTION(!overflowFrames, "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.
nsSize size;
lineLayout->EndSpan(this, size,
aMetrics.mComputeMEW ? &aMetrics.mMaxElementWidth : nsnull);
if ((0 == size.height) && (0 == size.width) &&
((nsnull != GetPrevInFlow()) || (nsnull != GetNextInFlow()))) {
// This is a continuation of a previous inline. Therefore make
// sure we don't affect the line-height.
aMetrics.width = 0;
aMetrics.height = 0;
aMetrics.ascent = 0;
aMetrics.descent = 0;
if (aMetrics.mComputeMEW) {
aMetrics.mMaxElementWidth = 0;
}
}
else {
// Compute final width
aMetrics.width = size.width;
if (nsnull == GetPrevContinuation()) {
aMetrics.width += ltr ? aReflowState.mComputedBorderPadding.left
: aReflowState.mComputedBorderPadding.right;
}
if (NS_FRAME_IS_COMPLETE(aStatus) && (!GetNextContinuation() || GetNextInFlow())) {
aMetrics.width += ltr ? aReflowState.mComputedBorderPadding.right
: aReflowState.mComputedBorderPadding.left;
}
SetFontFromStyle(aReflowState.rendContext, mStyleContext);
nsCOMPtr<nsIFontMetrics> fm;
aReflowState.rendContext->GetFontMetrics(*getter_AddRefs(fm));
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.
fm->GetMaxAscent(aMetrics.ascent);
fm->GetMaxDescent(aMetrics.descent);
fm->GetHeight(aMetrics.height);
} else {
NS_WARNING("Cannot get font metrics - defaulting sizes to 0");
aMetrics.ascent = aMetrics.descent = aMetrics.height = 0;
}
aMetrics.ascent += aReflowState.mComputedBorderPadding.top;
aMetrics.descent += aReflowState.mComputedBorderPadding.bottom;
aMetrics.height += aReflowState.mComputedBorderPadding.top +
aReflowState.mComputedBorderPadding.bottom;
}
// For now our overflow area is zero. The real value will be
// computed during vertical alignment of the line we are on.
aMetrics.mOverflowArea.SetRect(0, 0, 0, 0);
#ifdef NOISY_FINAL_SIZE
ListTag(stdout);
printf(": metrics=%d,%d ascent=%d descent=%d\n",
aMetrics.width, aMetrics.height, aMetrics.ascent, aMetrics.descent);
if (aMetrics.mComputeMEW) {
printf(" maxElementWidth %d\n", aMetrics.mMaxElementWidth);
}
#endif
return rv;
}
static
void SetContainsPercentAwareChild(nsIFrame *aFrame)
{
aFrame->AddStateBits(NS_INLINE_FRAME_CONTAINS_PERCENT_AWARE_CHILD);
}
static
void MarkPercentAwareFrame(nsPresContext *aPresContext,
nsInlineFrame *aInline,
nsIFrame *aFrame)
{
if (aFrame->GetStateBits() & NS_FRAME_REPLACED_ELEMENT)
{ // aFrame is a replaced element, check it's style
if (nsLineLayout::IsPercentageAwareReplacedElement(aPresContext, aFrame)) {
SetContainsPercentAwareChild(aInline);
}
}
else
{
if (aFrame->GetFirstChild(nsnull))
{ // aFrame is an inline container frame, check my frame state
if (aFrame->GetStateBits() & NS_INLINE_FRAME_CONTAINS_PERCENT_AWARE_CHILD) {
SetContainsPercentAwareChild(aInline); // if a child container is effected, so am I
}
}
// else frame is a leaf that we don't care about
}
}
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);
/* This next block is for bug 28811
Test the child frame for %-awareness,
and mark this frame with a bit if it is %-aware.
Don't bother if this frame is already marked
*/
if (!(mState & NS_INLINE_FRAME_CONTAINS_PERCENT_AWARE_CHILD)) {
MarkPercentAwareFrame(aPresContext, this, aFrame);
}
if (NS_FAILED(rv)) {
return rv;
}
if (NS_INLINE_IS_BREAK(aStatus)) {
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);
}
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) {
for (nsIFrame* f = aFrame->GetNextSibling(); f; f = f->GetNextSibling()) {
f->SetParent(this);
}
}
}
}
else {
// Break-after
if (NS_FRAME_IS_NOT_COMPLETE(aStatus)) {
nsIFrame* newFrame;
rv = CreateNextInFlow(aPresContext, this, aFrame, newFrame);
if (NS_FAILED(rv)) {
return rv;
}
}
nsIFrame* nextFrame = aFrame->GetNextSibling();
if (nextFrame) {
aStatus |= NS_FRAME_NOT_COMPLETE;
PushFrames(aPresContext, nextFrame, aFrame);
}
else if (nsnull != GetNextInFlow()) {
// We must return an incomplete status if there are more child
// frames remaining in a next-in-flow that follows this frame.
nsInlineFrame* nextInFlow = (nsInlineFrame*) GetNextInFlow();
while (nsnull != nextInFlow) {
if (nextInFlow->mFrames.NotEmpty()) {
aStatus |= NS_FRAME_NOT_COMPLETE;
break;
}
nextInFlow = (nsInlineFrame*) nextInFlow->GetNextInFlow();
}
}
}
}
else if (NS_FRAME_IS_NOT_COMPLETE(aStatus)) {
if (nsLayoutAtoms::placeholderFrame == aFrame->GetType()) {
nsBlockReflowState* blockRS = lineLayout->mBlockRS;
blockRS->mBlock->SplitPlaceholder(*blockRS, aFrame);
// Allow the parent to continue reflowing
aStatus = NS_FRAME_COMPLETE;
}
else {
nsIFrame* newFrame;
rv = CreateNextInFlow(aPresContext, this, aFrame, newFrame);
if (NS_FAILED(rv)) {
return rv;
}
if (!reflowingFirstLetter) {
nsIFrame* nextFrame = aFrame->GetNextSibling();
if (nextFrame) {
PushFrames(aPresContext, nextFrame, aFrame);
}
}
}
}
return rv;
}
nsIFrame*
nsInlineFrame::PullOneFrame(nsPresContext* aPresContext,
InlineReflowState& irs,
PRBool* aIsComplete)
{
PRBool isComplete = PR_TRUE;
nsIFrame* frame = nsnull;
nsInlineFrame* nextInFlow = irs.mNextInFlow;
while (nsnull != nextInFlow) {
frame = mFrames.PullFrame(this, irs.mPrevFrame, nextInFlow->mFrames);
if (nsnull != frame) {
isComplete = PR_FALSE;
nsHTMLContainerFrame::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)
{
NS_PRECONDITION(nsnull != aFromChild, "null pointer");
NS_PRECONDITION(nsnull != 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
// Disconnect aFromChild from its previous sibling
aPrevSibling->SetNextSibling(nsnull);
// Add the frames to our overflow list (let our next in flow drain
// our overflow list when it is ready)
SetOverflowFrames(aPresContext, aFromChild);
}
//////////////////////////////////////////////////////////////////////
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.
}
}
return skip;
}
#ifdef ACCESSIBILITY
NS_IMETHODIMP nsInlineFrame::GetAccessible(nsIAccessible** aAccessible)
{
// Broken image accessibles are created here, because layout
// replaces the image or image control frame with an inline frame
*aAccessible = nsnull;
nsIAtom *tagAtom = mContent->Tag();
if ((tagAtom == nsHTMLAtoms::img || tagAtom == nsHTMLAtoms::input ||
tagAtom == nsHTMLAtoms::label) && mContent->IsNodeOfType(nsINode::eHTML)) {
// Only get accessibility service if we're going to use it
nsCOMPtr<nsIAccessibilityService> accService(do_GetService("@mozilla.org/accessibilityService;1"));
if (!accService)
return NS_ERROR_FAILURE;
if (tagAtom == nsHTMLAtoms::input) // Broken <input type=image ... />
return accService->CreateHTMLButtonAccessible(NS_STATIC_CAST(nsIFrame*, this), aAccessible);
else if (tagAtom == nsHTMLAtoms::img) // Create accessible for broken <img>
return accService->CreateHTMLImageAccessible(NS_STATIC_CAST(nsIFrame*, this), aAccessible);
else if (tagAtom == nsHTMLAtoms::label) // Creat accessible for <label>
return accService->CreateHTMLLabelAccessible(NS_STATIC_CAST(nsIFrame*, this), aAccessible);
}
return NS_ERROR_FAILURE;
}
#endif
//////////////////////////////////////////////////////////////////////
// nsLineFrame implementation
static void
ReParentChildListStyle(nsPresContext* aPresContext,
nsFrameList& aFrameList,
nsIFrame* aParentFrame)
{
nsFrameManager *frameManager = aPresContext->FrameManager();
for (nsIFrame* kid = aFrameList.FirstChild(); kid;
kid = kid->GetNextSibling()) {
NS_ASSERTION(kid->GetParent() == aParentFrame, "Bogus parentage");
frameManager->ReParentStyleContext(kid);
}
}
nsIFrame*
NS_NewFirstLineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsFirstLineFrame(aContext);
}
#ifdef DEBUG
NS_IMETHODIMP
nsFirstLineFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Line"), aResult);
}
#endif
nsIAtom*
nsFirstLineFrame::GetType() const
{
return nsLayoutAtoms::lineFrame;
}
void
nsFirstLineFrame::StealFramesFrom(nsIFrame* aFrame)
{
nsIFrame* prevFrame = mFrames.GetPrevSiblingFor(aFrame);
if (prevFrame) {
prevFrame->SetNextSibling(nsnull);
}
else {
mFrames.SetFrames(nsnull);
}
}
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;
}
// Check for an overflow list with our prev-in-flow
nsFirstLineFrame* prevInFlow = (nsFirstLineFrame*)GetPrevInFlow();
if (nsnull != prevInFlow) {
nsIFrame* prevOverflowFrames = prevInFlow->GetOverflowFrames(aPresContext, PR_TRUE);
if (prevOverflowFrames) {
nsFrameList frames(prevOverflowFrames);
mFrames.InsertFrames(this, nsnull, prevOverflowFrames);
ReParentChildListStyle(aPresContext, frames, this);
}
}
// It's also possible that we have an overflow list for ourselves
nsIFrame* overflowFrames = GetOverflowFrames(aPresContext, PR_TRUE);
if (overflowFrames) {
NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
nsFrameList frames(overflowFrames);
mFrames.AppendFrames(nsnull, overflowFrames);
ReParentChildListStyle(aPresContext, frames, this);
}
// Set our own reflow state (additional state above and beyond
// aReflowState)
InlineReflowState irs;
irs.mPrevFrame = nsnull;
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()->
ResolvePseudoStyleFor(nsnull,
nsCSSAnonBoxes::mozLineFrame, parentContext);
if (newSC) {
// Switch to the new style context.
SetStyleContext(newSC);
// Re-resolve all children
ReParentChildListStyle(aPresContext, mFrames, this);
}
}
}
}
rv = ReflowFrames(aPresContext, aReflowState, irs, aMetrics, aStatus);
// Note: the line layout code will properly compute our overflow state for us
return rv;
}
//////////////////////////////////////////////////////////////////////
nsIFrame*
NS_NewPositionedInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsPositionedInlineFrame(aContext);
}
void
nsPositionedInlineFrame::Destroy()
{
mAbsoluteContainer.DestroyFrames(this);
nsInlineFrame::Destroy();
}
NS_IMETHODIMP
nsPositionedInlineFrame::SetInitialChildList(nsIAtom* aListName,
nsIFrame* aChildList)
{
nsresult rv;
if (mAbsoluteContainer.GetChildListName() == aListName) {
rv = mAbsoluteContainer.SetInitialChildList(this, aListName, aChildList);
} else {
rv = nsInlineFrame::SetInitialChildList(aListName, aChildList);
}
return rv;
}
NS_IMETHODIMP
nsPositionedInlineFrame::AppendFrames(nsIAtom* aListName,
nsIFrame* aFrameList)
{
nsresult rv;
if (mAbsoluteContainer.GetChildListName() == aListName) {
rv = mAbsoluteContainer.AppendFrames(this, aListName, aFrameList);
} else {
rv = nsInlineFrame::AppendFrames(aListName, aFrameList);
}
return rv;
}
NS_IMETHODIMP
nsPositionedInlineFrame::InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList)
{
nsresult rv;
if (mAbsoluteContainer.GetChildListName() == aListName) {
rv = mAbsoluteContainer.InsertFrames(this, aListName, aPrevFrame,
aFrameList);
} else {
rv = nsInlineFrame::InsertFrames(aListName, aPrevFrame, aFrameList);
}
return rv;
}
NS_IMETHODIMP
nsPositionedInlineFrame::RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame)
{
nsresult rv;
if (mAbsoluteContainer.GetChildListName() == aListName) {
rv = mAbsoluteContainer.RemoveFrame(this, aListName, aOldFrame);
} else {
rv = nsInlineFrame::RemoveFrame(aListName, aOldFrame);
}
return rv;
}
NS_IMETHODIMP
nsPositionedInlineFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
aBuilder->MarkFramesForDisplayList(this, mAbsoluteContainer.GetFirstChild(), aDirtyRect);
return nsHTMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
}
nsIAtom*
nsPositionedInlineFrame::GetAdditionalChildListName(PRInt32 aIndex) const
{
if (0 == aIndex) {
return mAbsoluteContainer.GetChildListName();
}
return nsnull;
}
nsIFrame*
nsPositionedInlineFrame::GetFirstChild(nsIAtom* aListName) const
{
if (mAbsoluteContainer.GetChildListName() == aListName) {
nsIFrame* result = nsnull;
mAbsoluteContainer.FirstChild(this, aListName, &result);
return result;
}
return nsInlineFrame::GetFirstChild(aListName);
}
nsIAtom*
nsPositionedInlineFrame::GetType() const
{
return nsLayoutAtoms::positionedInlineFrame;
}
NS_IMETHODIMP
nsPositionedInlineFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
nsresult rv = NS_OK;
// Don't bother optimizing for fast incremental reflow of absolute
// children of an inline
// Let the inline frame do its reflow first
rv = nsInlineFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
// Let the absolutely positioned container reflow any absolutely positioned
// child frames that need to be reflowed
// We want to do this under either of two conditions:
// 1. If we didn't do the incremental reflow above.
// 2. If our size changed.
// Even though it's the padding edge that's the containing block, we
// can use our rect (the border edge) since if the border style
// changed, the reflow would have been targeted at us so we'd satisfy
// condition 1.
if (NS_SUCCEEDED(rv) &&
mAbsoluteContainer.HasAbsoluteFrames()) {
// The containing block for the abs pos kids is formed by our padding edge.
nsMargin computedBorder =
aReflowState.mComputedBorderPadding - aReflowState.mComputedPadding;
nscoord containingBlockWidth =
aDesiredSize.width - computedBorder.LeftRight();
nscoord containingBlockHeight =
aDesiredSize.height - computedBorder.TopBottom();
// Do any incremental reflows ... would be nice to merge with
// the reflows below but that would be more work, and more risky
if (eReflowReason_Incremental == aReflowState.reason) {
mAbsoluteContainer.IncrementalReflow(this, aPresContext, aReflowState,
containingBlockWidth,
containingBlockHeight);
}
// Factor the absolutely positioned child bounds into the overflow area
// Don't include this frame's bounds, nor its inline descendants' bounds,
// and don't store the overflow property.
// That will all be done by nsLineLayout::RelativePositionFrames.
rv = mAbsoluteContainer.Reflow(this, aPresContext, aReflowState,
containingBlockWidth, containingBlockHeight,
&aDesiredSize.mOverflowArea);
}
return rv;
}
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