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a692880c23
gecko/layout/generic/nsInlineFrame.cpp
Ryan VanderMeulen a692880c23 Backed out 6 changesets (bug 743402) for reftest failures on a CLOSED TREE. 
Backed out changeset 19848fff857e (bug 743402)
Backed out changeset 049168537ae0 (bug 743402)
Backed out changeset 3098fea37f2d (bug 743402)
Backed out changeset ada93e976dca (bug 743402)
Backed out changeset c7907c54187f (bug 743402)
Backed out changeset 2edbbf6440c4 (bug 743402)
2013-07-24 15:14:04 -04:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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/. */
/* rendering object for CSS display:inline objects */
#include "nsInlineFrame.h"
#include "nsCOMPtr.h"
#include "nsLineLayout.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 "RestyleManager.h"
#include "nsDisplayList.h"
#include "mozilla/Likely.h"
#ifdef DEBUG
#undef NOISY_PUSHING
#endif
using namespace mozilla;
using namespace mozilla::layout;
//////////////////////////////////////////////////////////////////////
// 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(nsContainerFrame)
#ifdef DEBUG
NS_IMETHODIMP
nsInlineFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Inline"), aResult);
}
#endif
nsIAtom*
nsInlineFrame::GetType() const
{
return nsGkAtoms::inlineFrame;
}
void
nsInlineFrame::InvalidateFrame(uint32_t aDisplayItemKey)
{
if (IsSVGText()) {
nsIFrame* svgTextFrame =
nsLayoutUtils::GetClosestFrameOfType(GetParent(),
nsGkAtoms::svgTextFrame2);
svgTextFrame->InvalidateFrame();
return;
}
nsInlineFrameBase::InvalidateFrame(aDisplayItemKey);
}
void
nsInlineFrame::InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey)
{
if (IsSVGText()) {
nsIFrame* svgTextFrame =
nsLayoutUtils::GetClosestFrameOfType(GetParent(),
nsGkAtoms::svgTextFrame2);
svgTextFrame->InvalidateFrame();
return;
}
nsInlineFrameBase::InvalidateFrameWithRect(aRect, aDisplayItemKey);
}
static inline bool
IsMarginZero(const nsStyleCoord &aCoord)
{
return aCoord.GetUnit() == eStyleUnit_Auto ||
nsLayoutUtils::IsMarginZero(aCoord);
}
/* virtual */ bool
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 false;
}
#endif
const nsStyleMargin* margin = StyleMargin();
const nsStyleBorder* border = StyleBorder();
const nsStylePadding* padding = StylePadding();
// 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?
bool haveRight =
border->GetComputedBorderWidth(NS_SIDE_RIGHT) != 0 ||
!nsLayoutUtils::IsPaddingZero(padding->mPadding.GetRight()) ||
!IsMarginZero(margin->mMargin.GetRight());
bool haveLeft =
border->GetComputedBorderWidth(NS_SIDE_LEFT) != 0 ||
!nsLayoutUtils::IsPaddingZero(padding->mPadding.GetLeft()) ||
!IsMarginZero(margin->mMargin.GetLeft());
if (haveLeft || haveRight) {
if (GetStateBits() & NS_FRAME_IS_SPECIAL) {
bool haveStart, haveEnd;
if (NS_STYLE_DIRECTION_LTR == StyleVisibility()->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 false;
}
return true;
}
bool
nsInlineFrame::IsEmpty()
{
if (!IsSelfEmpty()) {
return false;
}
for (nsIFrame *kid = mFrames.FirstChild(); kid; kid = kid->GetNextSibling()) {
if (!kid->IsEmpty())
return false;
}
return true;
}
bool
nsInlineFrame::PeekOffsetCharacter(bool aForward, int32_t* aOffset,
bool aRespectClusters)
{
// Override the implementation in nsFrame, to skip empty inline frames
NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
int32_t 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 false;
}
void
nsInlineFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
BuildDisplayListForInline(aBuilder, aDirtyRect, aLists);
// 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()) {
DisplaySelectionOverlay(aBuilder, aLists.Content());
}
}
//////////////////////////////////////////////////////////////////////
// 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,
uint32_t aFlags)
{
// Inlines and text don't compute size before reflow.
return nsSize(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsRect
nsInlineFrame::ComputeTightBounds(gfxContext* aContext) const
{
// be conservative
if (StyleContext()->HasTextDecorationLines()) {
return GetVisualOverflowRect();
}
return ComputeSimpleTightBounds(aContext);
}
void
nsInlineFrame::ReparentFloatsForInlineChild(nsIFrame* aOurLineContainer,
nsIFrame* aFrame,
bool 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;
do {
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");
while (true) {
ourBlock->ReparentFloats(aFrame, frameBlock, 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)
{
RestyleManager* restyleManager = aPresContext->RestyleManager();
for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) {
NS_ASSERTION(e.get()->GetParent() == aParentFrame, "Bogus parentage");
restyleManager->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 (nullptr == aReflowState.mLineLayout) {
return NS_ERROR_INVALID_ARG;
}
if (IsFrameTreeTooDeep(aReflowState, aMetrics, aStatus)) {
return NS_OK;
}
bool lazilySetParentPointer = false;
nsIFrame* lineContainer = aReflowState.mLineLayout->LineContainerFrame();
// Check for an overflow list with our prev-in-flow
nsInlineFrame* prevInFlow = (nsInlineFrame*)GetPrevInFlow();
if (prevInFlow) {
AutoFrameListPtr prevOverflowFrames(aPresContext,
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 = true;
} else {
// Assign all floats to our block if necessary
if (lineContainer && lineContainer->GetPrevContinuation()) {
ReparentFloatsForInlineChild(lineContainer,
prevOverflowFrames->FirstChild(),
true);
}
// Insert the new frames at the beginning of the child list
// and set their parent pointer
const nsFrameList::Slice& newFrames =
mFrames.InsertFrames(this, nullptr, *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)) {
AutoFrameListPtr overflowFrames(aPresContext, StealOverflowFrames());
if (overflowFrames) {
NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
if (!lazilySetParentPointer) {
// The frames on our own overflowlist may have been pushed by a
// previous lazilySetParentPointer Reflow so we need to ensure
// the correct parent pointer now since we're not setting it
// lazily in this Reflow.
nsIFrame* firstChild = overflowFrames->FirstChild();
if (lineContainer && lineContainer->GetPrevContinuation()) {
ReparentFloatsForInlineChild(lineContainer, firstChild, true);
}
const bool inFirstLine = aReflowState.mLineLayout->GetInFirstLine();
RestyleManager* restyleManager = PresContext()->RestyleManager();
for (nsIFrame* f = firstChild; f; f = f->GetNextSibling()) {
f->SetParent(this);
if (inFirstLine) {
restyleManager->ReparentStyleContext(f);
}
}
}
mFrames.AppendFrames(nullptr, *overflowFrames);
}
}
// Set our own reflow state (additional state above and beyond
// aReflowState)
InlineReflowState irs;
irs.mPrevFrame = nullptr;
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.
bool 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 */ bool
nsInlineFrame::CanContinueTextRun() const
{
// We can continue a text run through an inline frame
return true;
}
/* virtual */ void
nsInlineFrame::PullOverflowsFromPrevInFlow()
{
nsInlineFrame* prevInFlow = static_cast<nsInlineFrame*>(GetPrevInFlow());
if (prevInFlow) {
nsPresContext* presContext = PresContext();
AutoFrameListPtr prevOverflowFrames(presContext,
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, nullptr, *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;
bool inFirstLine = aReflowState.mLineLayout->GetInFirstLine();
RestyleManager* restyleManager = aPresContext->RestyleManager();
bool 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, &mBaseline);
// First reflow our principal children.
nsIFrame* frame = mFrames.FirstChild();
bool done = false;
while (frame) {
// Check if we should lazily set the child frame's parent pointer.
if (irs.mSetParentPointer) {
bool havePrevBlock =
irs.mLineContainer && irs.mLineContainer->GetPrevContinuation();
nsIFrame* child = frame;
do {
// 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, child, false);
}
child->SetParent(this);
if (inFirstLine) {
restyleManager->ReparentStyleContext(child);
}
// We also need to do the same for |frame|'s next-in-flows that are in
// the sibling list. Otherwise, if we reflow |frame| and it's complete
// we'll crash when trying to delete its next-in-flow.
// This scenario doesn't happen often, but it can happen.
nsIFrame* nextSibling = child->GetNextSibling();
child = child->GetNextInFlow();
if (MOZ_UNLIKELY(child)) {
while (child != nextSibling && nextSibling) {
nextSibling = nextSibling->GetNextSibling();
}
if (!nextSibling) {
child = nullptr;
}
}
MOZ_ASSERT(!child || mFrames.ContainsFrame(child));
} while (child);
// 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->GetFirstPrincipalChild();
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) {
restyleManager->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;
}
}
}
}
}
MOZ_ASSERT(frame->GetParent() == this);
if (!done) {
bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
rv = ReflowInlineFrame(aPresContext, aReflowState, irs, frame, aStatus);
done = NS_FAILED(rv) ||
NS_INLINE_IS_BREAK(aStatus) ||
(!reflowingFirstLetter && NS_FRAME_IS_NOT_COMPLETE(aStatus));
if (done) {
if (!irs.mSetParentPointer) {
break;
}
// Keep reparenting the remaining siblings, but don't reflow them.
nsFrameList* pushedFrames = GetOverflowFrames();
if (pushedFrames && pushedFrames->FirstChild() == frame) {
// Don't bother if |frame| was pushed to our overflow list.
break;
}
} else {
irs.mPrevFrame = frame;
}
}
frame = frame->GetNextSibling();
}
// Attempt to pull frames from our next-in-flow until we can't
if (!done && GetNextInFlow()) {
while (true) {
bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
bool 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 (nullptr == frame) {
if (!isComplete) {
aStatus = NS_FRAME_NOT_COMPLETE;
}
break;
}
rv = ReflowInlineFrame(aPresContext, aReflowState, irs, frame, aStatus);
if (NS_FAILED(rv) ||
NS_INLINE_IS_BREAK(aStatus) ||
(!reflowingFirstLetter && NS_FRAME_IS_NOT_COMPLETE(aStatus))) {
break;
}
irs.mPrevFrame = frame;
frame = frame->GetNextSibling();
}
}
NS_ASSERTION(!NS_FRAME_IS_COMPLETE(aStatus) || !GetOverflowFrames(),
"We can't be complete AND have overflow frames!");
// 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;
}
nsRefPtr<nsFontMetrics> fm;
float inflation = nsLayoutUtils::FontSizeInflationFor(this);
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm), inflation);
aReflowState.rendContext->SetFont(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.
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;
bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
bool pushedFrame;
nsresult rv =
lineLayout->ReflowFrame(aFrame, aStatus, nullptr, 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.
}
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,
bool* aIsComplete)
{
bool isComplete = true;
nsIFrame* frame = nullptr;
nsInlineFrame* nextInFlow = irs.mNextInFlow;
while (nextInFlow) {
frame = nextInFlow->mFrames.FirstChild();
if (!frame) {
// The nextInFlow's principal list has no frames, try its overflow list.
nsFrameList* overflowFrames = nextInFlow->GetOverflowFrames();
if (overflowFrames) {
frame = overflowFrames->RemoveFirstChild();
if (overflowFrames->IsEmpty()) {
// We're stealing the only frame - delete the overflow list.
nextInFlow->DestroyOverflowList(aPresContext);
} else {
// We leave the remaining frames on the overflow list (rather than
// putting them on nextInFlow's principal list) so we don't have to
// set up the parent for them.
}
// ReparentFloatsForInlineChild needs it to be on a child list -
// we remove it again below.
nextInFlow->mFrames.SetFrames(frame);
}
}
if (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, false);
}
nextInFlow->mFrames.RemoveFirstChild();
// nsFirstLineFrame::PullOneFrame calls ReparentStyleContext.
mFrames.InsertFrame(this, irs.mPrevFrame, frame);
isComplete = false;
if (irs.mLineLayout) {
irs.mLineLayout->SetDirtyNextLine();
}
nsContainerFrame::ReparentFrameView(aPresContext, frame, nextInFlow, this);
break;
}
nextInFlow = static_cast<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();
}
}
//////////////////////////////////////////////////////////////////////
int
nsInlineFrame::GetSkipSides() const
{
int 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.
bool ltr = (NS_STYLE_DIRECTION_LTR == StyleVisibility()->mDirection);
int startBit = (1 << (ltr ? NS_SIDE_LEFT : NS_SIDE_RIGHT));
int 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
{
return mBaseline;
}
#ifdef ACCESSIBILITY
a11y::AccType
nsInlineFrame::AccessibleType()
{
// 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::input) // Broken <input type=image ... />
return a11y::eHTMLButtonType;
if (tagAtom == nsGkAtoms::img) // Create accessible for broken <img>
return a11y::eHyperTextType;
if (tagAtom == nsGkAtoms::label) // Creat accessible for <label>
return a11y::eHTMLLabelType;
return a11y::eNoType;
}
#endif
//////////////////////////////////////////////////////////////////////
// nsLineFrame implementation
nsIFrame*
NS_NewFirstLineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsFirstLineFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsFirstLineFrame)
void
nsFirstLineFrame::Init(nsIContent* aContent, nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsInlineFrame::Init(aContent, aParent, aPrevInFlow);
if (!aPrevInFlow) {
MOZ_ASSERT(StyleContext()->GetPseudo() == nsCSSPseudoElements::firstLine);
return;
}
// This frame is a continuation - fixup the style context if aPrevInFlow
// is the first-in-flow (the only one with a ::first-line pseudo).
if (aPrevInFlow->StyleContext()->GetPseudo() == nsCSSPseudoElements::firstLine) {
MOZ_ASSERT(GetFirstInFlow() == aPrevInFlow);
// 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.
nsStyleContext* parentContext = aParent->StyleContext();
nsRefPtr<nsStyleContext> newSC = PresContext()->StyleSet()->
ResolveAnonymousBoxStyle(nsCSSAnonBoxes::mozLineFrame, parentContext);
SetStyleContext(newSC);
} else {
MOZ_ASSERT(GetFirstInFlow() != aPrevInFlow);
MOZ_ASSERT(aPrevInFlow->StyleContext()->GetPseudo() ==
nsCSSAnonBoxes::mozLineFrame);
}
}
#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,
bool* 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->RestyleManager()->ReparentStyleContext(frame);
}
return frame;
}
NS_IMETHODIMP
nsFirstLineFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
if (nullptr == aReflowState.mLineLayout) {
return NS_ERROR_INVALID_ARG;
}
nsIFrame* lineContainer = aReflowState.mLineLayout->LineContainerFrame();
// Check for an overflow list with our prev-in-flow
nsFirstLineFrame* prevInFlow = (nsFirstLineFrame*)GetPrevInFlow();
if (prevInFlow) {
AutoFrameListPtr prevOverflowFrames(aPresContext,
prevInFlow->StealOverflowFrames());
if (prevOverflowFrames) {
// Assign all floats to our block if necessary
if (lineContainer && lineContainer->GetPrevContinuation()) {
ReparentFloatsForInlineChild(lineContainer,
prevOverflowFrames->FirstChild(),
true);
}
const nsFrameList::Slice& newFrames =
mFrames.InsertFrames(this, nullptr, *prevOverflowFrames);
ReparentChildListStyle(aPresContext, newFrames, this);
}
}
// It's also possible that we have an overflow list for ourselves
AutoFrameListPtr overflowFrames(aPresContext, StealOverflowFrames());
if (overflowFrames) {
NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
const nsFrameList::Slice& newFrames =
mFrames.AppendFrames(nullptr, *overflowFrames);
ReparentChildListStyle(aPresContext, newFrames, this);
}
// Set our own reflow state (additional state above and beyond
// aReflowState)
InlineReflowState irs;
irs.mPrevFrame = nullptr;
irs.mLineContainer = lineContainer;
irs.mLineLayout = aReflowState.mLineLayout;
irs.mNextInFlow = (nsInlineFrame*) GetNextInFlow();
nsresult rv;
bool 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.
bool complete;
PullOneFrame(aPresContext, irs, &complete);
}
if (nullptr == 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 (;;) {
bool complete;
nsIFrame* frame = PullOneFrame(aPresContext, irs, &complete);
if (!frame) {
break;
}
irs.mPrevFrame = frame;
}
irs.mPrevFrame = nullptr;
}
NS_ASSERTION(!aReflowState.mLineLayout->GetInFirstLine(),
"Nested first-line frames? BOGUS");
aReflowState.mLineLayout->SetInFirstLine(true);
rv = ReflowFrames(aPresContext, aReflowState, irs, aMetrics, aStatus);
aReflowState.mLineLayout->SetInFirstLine(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) {
nsPresContext* presContext = PresContext();
AutoFrameListPtr prevOverflowFrames(presContext,
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, nullptr, *prevOverflowFrames);
ReparentChildListStyle(presContext, newFrames, this);
}
}
}
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