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Mypal/layout/generic/nsInlineFrame.cpp

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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 "nsLineLayout.h"
#include "nsBlockFrame.h"
#include "nsPlaceholderFrame.h"
#include "nsGkAtoms.h"
#include "nsStyleContext.h"
#include "nsPresContext.h"
#include "nsRenderingContext.h"
#include "nsCSSAnonBoxes.h"
#include "mozilla/RestyleManagerHandle.h"
#include "mozilla/RestyleManagerHandleInlines.h"
#include "nsDisplayList.h"
#include "mozilla/Likely.h"
#include "SVGTextFrame.h"
#include "mozilla/StyleSetHandle.h"
#include "mozilla/StyleSetHandleInlines.h"
#ifdef DEBUG
#undef NOISY_PUSHING
#endif
using namespace mozilla;
using namespace mozilla::layout;
//////////////////////////////////////////////////////////////////////
// Basic nsInlineFrame methods
nsInlineFrame*
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_FRAME_DUMP
nsresult
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::svgTextFrame);
svgTextFrame->InvalidateFrame();
return;
}
nsContainerFrame::InvalidateFrame(aDisplayItemKey);
}
void
nsInlineFrame::InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey)
{
if (IsSVGText()) {
nsIFrame* svgTextFrame =
nsLayoutUtils::GetClosestFrameOfType(GetParent(),
nsGkAtoms::svgTextFrame);
svgTextFrame->InvalidateFrame();
return;
}
nsContainerFrame::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();
// Block-start and -end ignored, 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?
WritingMode wm = GetWritingMode();
bool haveStart, haveEnd;
// Initially set up haveStart and haveEnd in terms of visual (LTR/TTB)
// coordinates; we'll exchange them later if bidi-RTL is in effect to
// get logical start and end flags.
if (wm.IsVertical()) {
haveStart =
border->GetComputedBorderWidth(NS_SIDE_TOP) != 0 ||
!nsLayoutUtils::IsPaddingZero(padding->mPadding.GetTop()) ||
!IsMarginZero(margin->mMargin.GetTop());
haveEnd =
border->GetComputedBorderWidth(NS_SIDE_BOTTOM) != 0 ||
!nsLayoutUtils::IsPaddingZero(padding->mPadding.GetBottom()) ||
!IsMarginZero(margin->mMargin.GetBottom());
} else {
haveStart =
border->GetComputedBorderWidth(NS_SIDE_LEFT) != 0 ||
!nsLayoutUtils::IsPaddingZero(padding->mPadding.GetLeft()) ||
!IsMarginZero(margin->mMargin.GetLeft());
haveEnd =
border->GetComputedBorderWidth(NS_SIDE_RIGHT) != 0 ||
!nsLayoutUtils::IsPaddingZero(padding->mPadding.GetRight()) ||
!IsMarginZero(margin->mMargin.GetRight());
}
if (haveStart || haveEnd) {
// We skip this block and return false for box-decoration-break:clone since
// in that case all the continuations will have the border/padding/margin.
if ((GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) &&
StyleBorder()->mBoxDecorationBreak == StyleBoxDecorationBreak::Slice) {
// When direction=rtl, we need to consider logical rather than visual
// start and end, so swap the flags.
if (!wm.IsBidiLTR()) {
Swap(haveStart, haveEnd);
}
// For ib-split frames, ignore things we know we'll skip in GetSkipSides.
// XXXbz should we be doing this for non-ib-split 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 = FirstContinuation();
return
(!haveStart || firstCont->FrameIsNonFirstInIBSplit()) &&
(!haveEnd || firstCont->FrameIsNonLastInIBSplit());
}
return false;
}
return true;
}
bool
nsInlineFrame::IsEmpty()
{
if (!IsSelfEmpty()) {
return false;
}
for (nsIFrame* kid : mFrames) {
if (!kid->IsEmpty())
return false;
}
return true;
}
nsIFrame::FrameSearchResult
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 CONTINUE;
}
void
nsInlineFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
nsFrameList* overflowFrames = GetOverflowFrames();
if (overflowFrames) {
// Fixup the parent pointers for any child frames on the OverflowList.
// nsIFrame::DestroyFrom depends on that to find the sticky scroll
// container (an ancestor).
overflowFrames->ApplySetParent(this);
}
nsContainerFrame::DestroyFrom(aDestructRoot);
}
nsresult
nsInlineFrame::StealFrame(nsIFrame* aChild)
{
if (MaybeStealOverflowContainerFrame(aChild)) {
return NS_OK;
}
nsInlineFrame* parent = this;
bool removed = false;
do {
removed = parent->mFrames.StartRemoveFrame(aChild);
if (removed) {
break;
}
// We didn't find the child in our principal child list.
// Maybe it's on the overflow list?
nsFrameList* frameList = parent->GetOverflowFrames();
if (frameList) {
removed = frameList->ContinueRemoveFrame(aChild);
if (frameList->IsEmpty()) {
parent->DestroyOverflowList();
}
if (removed) {
break;
}
}
// Due to our "lazy reparenting" optimization 'aChild' might not actually
// be on any of our child lists, but instead in one of our next-in-flows.
parent = static_cast<nsInlineFrame*>(parent->GetNextInFlow());
} while (parent);
MOZ_ASSERT(removed, "nsInlineFrame::StealFrame: can't find aChild");
return removed ? NS_OK : NS_ERROR_UNEXPECTED;
}
void
nsInlineFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists)
{
BuildDisplayListForInline(aBuilder, 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::AddInlineMinISize(nsRenderingContext *aRenderingContext,
nsIFrame::InlineMinISizeData *aData)
{
DoInlineIntrinsicISize(aRenderingContext, aData, nsLayoutUtils::MIN_ISIZE);
}
/* virtual */ void
nsInlineFrame::AddInlinePrefISize(nsRenderingContext *aRenderingContext,
nsIFrame::InlinePrefISizeData *aData)
{
DoInlineIntrinsicISize(aRenderingContext, aData, nsLayoutUtils::PREF_ISIZE);
}
/* virtual */
LogicalSize
nsInlineFrame::ComputeSize(nsRenderingContext *aRenderingContext,
WritingMode aWM,
const LogicalSize& aCBSize,
nscoord aAvailableISize,
const LogicalSize& aMargin,
const LogicalSize& aBorder,
const LogicalSize& aPadding,
ComputeSizeFlags aFlags)
{
// Inlines and text don't compute size before reflow.
return LogicalSize(aWM, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsRect
nsInlineFrame::ComputeTightBounds(DrawTarget* aDrawTarget) const
{
// be conservative
if (StyleContext()->HasTextDecorationLines()) {
return GetVisualOverflowRect();
}
return ComputeSimpleTightBounds(aDrawTarget);
}
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;
}
nsBlockFrame* frameBlock = nsLayoutUtils::GetFloatContainingBlock(aFrame);
if (!frameBlock || frameBlock == aOurLineContainer) {
return;
}
nsBlockFrame* ourBlock = nsLayoutUtils::GetAsBlock(aOurLineContainer);
NS_ASSERTION(ourBlock, "Not a block, but broke vertically?");
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)
{
RestyleManagerHandle restyleManager = aPresContext->RestyleManager();
for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) {
NS_ASSERTION(e.get()->GetParent() == aParentFrame, "Bogus parentage");
restyleManager->ReparentStyleContext(e.get());
nsLayoutUtils::MarkDescendantsDirty(e.get());
}
}
void
nsInlineFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aMetrics,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus)
{
MarkInReflow();
DO_GLOBAL_REFLOW_COUNT("nsInlineFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowInput, aMetrics, aStatus);
if (nullptr == aReflowInput.mLineLayout) {
NS_ERROR("must have non-null aReflowInput.mLineLayout");
return;
}
if (IsFrameTreeTooDeep(aReflowInput, aMetrics, aStatus)) {
return;
}
bool lazilySetParentPointer = false;
// 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(*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 {
// 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 (aReflowInput.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)) {
DrainFlags flags =
lazilySetParentPointer ? eDontReparentFrames : DrainFlags(0);
if (aReflowInput.mLineLayout->GetInFirstLine()) {
flags = DrainFlags(flags | eInFirstLine);
}
DrainSelfOverflowListInternal(flags);
}
// Set our own reflow state (additional state above and beyond aReflowInput)
InlineReflowInput irs;
irs.mPrevFrame = nullptr;
irs.mLineContainer = aReflowInput.mLineLayout->LineContainerFrame();
irs.mLineLayout = aReflowInput.mLineLayout;
irs.mNextInFlow = (nsInlineFrame*) GetNextInFlow();
irs.mSetParentPointer = lazilySetParentPointer;
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);
}
ReflowFrames(aPresContext, aReflowInput, irs, aMetrics, aStatus);
ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowInput, aStatus);
// Note: the line layout code will properly compute our
// overflow-rect state for us.
NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aMetrics);
}
nsresult
nsInlineFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
nsresult rv =
nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
if (NS_FAILED(rv)) {
return rv;
}
if (IsSVGText()) {
SVGTextFrame* f = static_cast<SVGTextFrame*>(
nsLayoutUtils::GetClosestFrameOfType(this, nsGkAtoms::svgTextFrame));
f->HandleAttributeChangeInDescendant(mContent->AsElement(),
aNameSpaceID, aAttribute);
}
return NS_OK;
}
bool
nsInlineFrame::DrainSelfOverflowListInternal(DrainFlags aFlags)
{
AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames());
if (overflowFrames) {
// The frames on our own overflowlist may have been pushed by a
// previous lazilySetParentPointer Reflow so we need to ensure the
// correct parent pointer. This is sometimes skipped by Reflow.
if (!(aFlags & eDontReparentFrames)) {
nsIFrame* firstChild = overflowFrames->FirstChild();
const bool doReparentSC = (aFlags & eInFirstLine);
RestyleManagerHandle restyleManager = PresContext()->RestyleManager();
for (nsIFrame* f = firstChild; f; f = f->GetNextSibling()) {
f->SetParent(this);
if (doReparentSC) {
restyleManager->ReparentStyleContext(f);
nsLayoutUtils::MarkDescendantsDirty(f);
}
}
}
bool result = !overflowFrames->IsEmpty();
mFrames.AppendFrames(nullptr, *overflowFrames);
return result;
}
return false;
}
/* virtual */ bool
nsInlineFrame::DrainSelfOverflowList()
{
nsIFrame* lineContainer = nsLayoutUtils::FindNearestBlockAncestor(this);
// Add the eInFirstLine flag if we have a ::first-line ancestor frame.
// No need to look further than the nearest line container though.
DrainFlags flags = DrainFlags(0);
for (nsIFrame* p = GetParent(); p != lineContainer; p = p->GetParent()) {
if (p->GetType() == nsGkAtoms::lineFrame) {
flags = DrainFlags(flags | eInFirstLine);
break;
}
}
return DrainSelfOverflowListInternal(flags);
}
/* 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(*prevOverflowFrames, prevInFlow,
this);
mFrames.InsertFrames(this, nullptr, *prevOverflowFrames);
}
}
}
void
nsInlineFrame::ReflowFrames(nsPresContext* aPresContext,
const ReflowInput& aReflowInput,
InlineReflowInput& irs,
ReflowOutput& aMetrics,
nsReflowStatus& aStatus)
{
aStatus = NS_FRAME_COMPLETE;
nsLineLayout* lineLayout = aReflowInput.mLineLayout;
bool inFirstLine = aReflowInput.mLineLayout->GetInFirstLine();
RestyleManagerHandle restyleManager = aPresContext->RestyleManager();
WritingMode frameWM = aReflowInput.GetWritingMode();
WritingMode lineWM = aReflowInput.mLineLayout->mRootSpan->mWritingMode;
LogicalMargin framePadding = aReflowInput.ComputedLogicalBorderPadding();
nscoord startEdge = 0;
const bool boxDecorationBreakClone =
MOZ_UNLIKELY(StyleBorder()->mBoxDecorationBreak ==
StyleBoxDecorationBreak::Clone);
// 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. For
// box-decoration-break:clone we always offset our start since all
// continuations have border/padding.
if ((!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) ||
boxDecorationBreakClone) {
startEdge = framePadding.IStart(frameWM);
}
nscoord availableISize = aReflowInput.AvailableISize();
NS_ASSERTION(availableISize != NS_UNCONSTRAINEDSIZE,
"should no longer use available widths");
// Subtract off inline axis border+padding from availableISize
availableISize -= startEdge;
availableISize -= framePadding.IEnd(frameWM);
lineLayout->BeginSpan(this, &aReflowInput, startEdge,
startEdge + availableISize, &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) {
nsIFrame* child = frame;
do {
child->SetParent(this);
if (inFirstLine) {
restyleManager->ReparentStyleContext(child);
nsLayoutUtils::MarkDescendantsDirty(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->PrincipalChildList().FirstChild();
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);
nsLayoutUtils::MarkDescendantsDirty(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();
ReflowInlineFrame(aPresContext, aReflowInput, irs, frame, aStatus);
done = 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;
}
ReflowInlineFrame(aPresContext, aReflowInput, irs, frame, aStatus);
if (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.ISize(lineWM) = lineLayout->EndSpan(this);
// Compute final width.
// XXX Note that that the padding start and end are in the frame's
// writing mode, but the metrics' inline-size is in the line's
// writing mode. This makes sense if the line and frame are both
// vertical or both horizontal, but what should happen with
// orthogonal inlines?
// 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. For box-decoration-break:clone we always include our start border
// and padding since all continuations have them.
if ((!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) ||
boxDecorationBreakClone) {
aMetrics.ISize(lineWM) += framePadding.IStart(frameWM);
}
/*
* 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. For box-decoration-break:clone we always apply the end border and
* padding since all continuations have them.
*/
if ((NS_FRAME_IS_COMPLETE(aStatus) &&
!LastInFlow()->GetNextContinuation() &&
!FrameIsNonLastInIBSplit()) ||
boxDecorationBreakClone) {
aMetrics.ISize(lineWM) += framePadding.IEnd(frameWM);
}
nsLayoutUtils::SetBSizeFromFontMetrics(this, aMetrics,
framePadding, lineWM, frameWM);
// 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.TopAscent());
#endif
}
void
nsInlineFrame::ReflowInlineFrame(nsPresContext* aPresContext,
const ReflowInput& aReflowInput,
InlineReflowInput& irs,
nsIFrame* aFrame,
nsReflowStatus& aStatus)
{
nsLineLayout* lineLayout = aReflowInput.mLineLayout;
bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
bool pushedFrame;
lineLayout->ReflowFrame(aFrame, aStatus, nullptr, pushedFrame);
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;
}
// Create a next-in-flow if needed.
if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus)) {
CreateNextInFlow(aFrame);
}
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;
}
if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus) && !reflowingFirstLetter) {
nsIFrame* nextFrame = aFrame->GetNextSibling();
if (nextFrame) {
PushFrames(aPresContext, nextFrame, aFrame, irs);
}
}
}
nsIFrame*
nsInlineFrame::PullOneFrame(nsPresContext* aPresContext,
InlineReflowInput& 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();
} 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(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,
InlineReflowInput& 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(mFrames.RemoveFramesAfter(aPrevSibling));
if (aState.mLineLayout) {
aState.mLineLayout->SetDirtyNextLine();
}
}
//////////////////////////////////////////////////////////////////////
nsIFrame::LogicalSides
nsInlineFrame::GetLogicalSkipSides(const ReflowInput* aReflowInput) const
{
if (MOZ_UNLIKELY(StyleBorder()->mBoxDecorationBreak ==
StyleBoxDecorationBreak::Clone)) {
return LogicalSides();
}
LogicalSides skip;
if (!IsFirst()) {
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 start
// border edge.
skip |= eLogicalSideBitsIStart;
}
else {
// If the prev continuation is empty, then go ahead and let our start
// edge border render.
}
}
if (!IsLast()) {
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 end
// border edge.
skip |= eLogicalSideBitsIEnd;
}
else {
// If the next continuation is empty, then go ahead and let our end
// edge border render.
}
}
if (GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) {
// 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.
if (skip != LogicalSides(eLogicalSideBitsIBoth)) {
// 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 = FirstContinuation();
if (firstContinuation->FrameIsNonLastInIBSplit()) {
skip |= eLogicalSideBitsIEnd;
}
if (firstContinuation->FrameIsNonFirstInIBSplit()) {
skip |= eLogicalSideBitsIStart;
}
}
}
return skip;
}
nscoord
nsInlineFrame::GetLogicalBaseline(mozilla::WritingMode aWritingMode) 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
if (mContent->IsHTMLElement(nsGkAtoms::input)) // Broken <input type=image ... />
return a11y::eHTMLButtonType;
if (mContent->IsHTMLElement(nsGkAtoms::img)) // Create accessible for broken <img>
return a11y::eHyperTextType;
return a11y::eNoType;
}
#endif
//////////////////////////////////////////////////////////////////////
// nsLineFrame implementation
nsFirstLineFrame*
NS_NewFirstLineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsFirstLineFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsFirstLineFrame)
void
nsFirstLineFrame::Init(nsIContent* aContent,
nsContainerFrame* 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(FirstInFlow() == 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();
RefPtr<nsStyleContext> newSC = PresContext()->StyleSet()->
ResolveAnonymousBoxStyle(nsCSSAnonBoxes::mozLineFrame, parentContext);
SetStyleContext(newSC);
} else {
MOZ_ASSERT(FirstInFlow() != aPrevInFlow);
MOZ_ASSERT(aPrevInFlow->StyleContext()->GetPseudo() ==
nsCSSAnonBoxes::mozLineFrame);
}
}
#ifdef DEBUG_FRAME_DUMP
nsresult
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, InlineReflowInput& 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);
nsLayoutUtils::MarkDescendantsDirty(frame);
}
return frame;
}
void
nsFirstLineFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aMetrics,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus)
{
MarkInReflow();
if (nullptr == aReflowInput.mLineLayout) {
return; // XXX does this happen? why?
}
// Check for an overflow list with our prev-in-flow
nsFirstLineFrame* prevInFlow = (nsFirstLineFrame*)GetPrevInFlow();
if (prevInFlow) {
AutoFrameListPtr prevOverflowFrames(aPresContext,
prevInFlow->StealOverflowFrames());
if (prevOverflowFrames) {
// Reparent the new frames and their style contexts.
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.
DrainSelfOverflowList();
// Set our own reflow state (additional state above and beyond
// aReflowInput)
InlineReflowInput irs;
irs.mPrevFrame = nullptr;
irs.mLineContainer = aReflowInput.mLineLayout->LineContainerFrame();
irs.mLineLayout = aReflowInput.mLineLayout;
irs.mNextInFlow = (nsInlineFrame*) GetNextInFlow();
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(!aReflowInput.mLineLayout->GetInFirstLine(),
"Nested first-line frames? BOGUS");
aReflowInput.mLineLayout->SetInFirstLine(true);
ReflowFrames(aPresContext, aReflowInput, irs, aMetrics, aStatus);
aReflowInput.mLineLayout->SetInFirstLine(false);
ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowInput, aStatus);
// Note: the line layout code will properly compute our overflow state for us
}
/* 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);
}
}
}
/* virtual */ bool
nsFirstLineFrame::DrainSelfOverflowList()
{
AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames());
if (overflowFrames) {
bool result = !overflowFrames->IsEmpty();
const nsFrameList::Slice& newFrames =
mFrames.AppendFrames(nullptr, *overflowFrames);
ReparentChildListStyle(PresContext(), newFrames, this);
return result;
}
return false;
}
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