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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /layout/generic/TextOverflow.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'layout/generic/TextOverflow.cpp')
-rw-r--r--layout/generic/TextOverflow.cpp837
1 files changed, 837 insertions, 0 deletions
diff --git a/layout/generic/TextOverflow.cpp b/layout/generic/TextOverflow.cpp
new file mode 100644
index 000000000..b4d935fbf
--- /dev/null
+++ b/layout/generic/TextOverflow.cpp
@@ -0,0 +1,837 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
+/* 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/. */
+
+#include "TextOverflow.h"
+#include <algorithm>
+
+// Please maintain alphabetical order below
+#include "nsBlockFrame.h"
+#include "nsCaret.h"
+#include "nsContentUtils.h"
+#include "nsCSSAnonBoxes.h"
+#include "nsFontMetrics.h"
+#include "nsGfxScrollFrame.h"
+#include "nsIScrollableFrame.h"
+#include "nsLayoutUtils.h"
+#include "nsPresContext.h"
+#include "nsRect.h"
+#include "nsRenderingContext.h"
+#include "nsTextFrame.h"
+#include "nsIFrameInlines.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/Likely.h"
+#include "nsISelection.h"
+
+namespace mozilla {
+namespace css {
+
+class LazyReferenceRenderingDrawTargetGetterFromFrame final :
+ public gfxFontGroup::LazyReferenceDrawTargetGetter {
+public:
+ typedef mozilla::gfx::DrawTarget DrawTarget;
+
+ explicit LazyReferenceRenderingDrawTargetGetterFromFrame(nsIFrame* aFrame)
+ : mFrame(aFrame) {}
+ virtual already_AddRefed<DrawTarget> GetRefDrawTarget() override
+ {
+ RefPtr<gfxContext> ctx =
+ mFrame->PresContext()->PresShell()->CreateReferenceRenderingContext();
+ RefPtr<DrawTarget> dt = ctx->GetDrawTarget();
+ return dt.forget();
+ }
+private:
+ nsIFrame* mFrame;
+};
+
+static gfxTextRun*
+GetEllipsisTextRun(nsIFrame* aFrame)
+{
+ RefPtr<nsFontMetrics> fm =
+ nsLayoutUtils::GetInflatedFontMetricsForFrame(aFrame);
+ LazyReferenceRenderingDrawTargetGetterFromFrame lazyRefDrawTargetGetter(aFrame);
+ return fm->GetThebesFontGroup()->GetEllipsisTextRun(
+ aFrame->PresContext()->AppUnitsPerDevPixel(),
+ nsLayoutUtils::GetTextRunOrientFlagsForStyle(aFrame->StyleContext()),
+ lazyRefDrawTargetGetter);
+}
+
+static nsIFrame*
+GetSelfOrNearestBlock(nsIFrame* aFrame)
+{
+ return nsLayoutUtils::GetAsBlock(aFrame) ? aFrame :
+ nsLayoutUtils::FindNearestBlockAncestor(aFrame);
+}
+
+// Return true if the frame is an atomic inline-level element.
+// It's not supposed to be called for block frames since we never
+// process block descendants for text-overflow.
+static bool
+IsAtomicElement(nsIFrame* aFrame, const nsIAtom* aFrameType)
+{
+ NS_PRECONDITION(!nsLayoutUtils::GetAsBlock(aFrame) ||
+ !aFrame->IsBlockOutside(),
+ "unexpected block frame");
+ NS_PRECONDITION(aFrameType != nsGkAtoms::placeholderFrame,
+ "unexpected placeholder frame");
+ return !aFrame->IsFrameOfType(nsIFrame::eLineParticipant);
+}
+
+static bool
+IsFullyClipped(nsTextFrame* aFrame, nscoord aLeft, nscoord aRight,
+ nscoord* aSnappedLeft, nscoord* aSnappedRight)
+{
+ *aSnappedLeft = aLeft;
+ *aSnappedRight = aRight;
+ if (aLeft <= 0 && aRight <= 0) {
+ return false;
+ }
+ return !aFrame->MeasureCharClippedText(aLeft, aRight,
+ aSnappedLeft, aSnappedRight);
+}
+
+static bool
+IsInlineAxisOverflowVisible(nsIFrame* aFrame)
+{
+ NS_PRECONDITION(nsLayoutUtils::GetAsBlock(aFrame) != nullptr,
+ "expected a block frame");
+
+ nsIFrame* f = aFrame;
+ while (f && f->StyleContext()->GetPseudo() &&
+ f->GetType() != nsGkAtoms::scrollFrame) {
+ f = f->GetParent();
+ }
+ if (!f) {
+ return true;
+ }
+ auto overflow = aFrame->GetWritingMode().IsVertical() ?
+ f->StyleDisplay()->mOverflowY : f->StyleDisplay()->mOverflowX;
+ return overflow == NS_STYLE_OVERFLOW_VISIBLE;
+}
+
+static void
+ClipMarker(const nsRect& aContentArea,
+ const nsRect& aMarkerRect,
+ DisplayListClipState::AutoSaveRestore& aClipState)
+{
+ nscoord rightOverflow = aMarkerRect.XMost() - aContentArea.XMost();
+ nsRect markerRect = aMarkerRect;
+ if (rightOverflow > 0) {
+ // Marker overflows on the right side (content width < marker width).
+ markerRect.width -= rightOverflow;
+ aClipState.ClipContentDescendants(markerRect);
+ } else {
+ nscoord leftOverflow = aContentArea.x - aMarkerRect.x;
+ if (leftOverflow > 0) {
+ // Marker overflows on the left side
+ markerRect.width -= leftOverflow;
+ markerRect.x += leftOverflow;
+ aClipState.ClipContentDescendants(markerRect);
+ }
+ }
+}
+
+static void
+InflateIStart(WritingMode aWM, LogicalRect* aRect, nscoord aDelta)
+{
+ nscoord iend = aRect->IEnd(aWM);
+ aRect->IStart(aWM) -= aDelta;
+ aRect->ISize(aWM) = std::max(iend - aRect->IStart(aWM), 0);
+}
+
+static void
+InflateIEnd(WritingMode aWM, LogicalRect* aRect, nscoord aDelta)
+{
+ aRect->ISize(aWM) = std::max(aRect->ISize(aWM) + aDelta, 0);
+}
+
+static bool
+IsFrameDescendantOfAny(nsIFrame* aChild,
+ const TextOverflow::FrameHashtable& aSetOfFrames,
+ nsIFrame* aCommonAncestor)
+{
+ for (nsIFrame* f = aChild; f && f != aCommonAncestor;
+ f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
+ if (aSetOfFrames.GetEntry(f)) {
+ return true;
+ }
+ }
+ return false;
+}
+
+class nsDisplayTextOverflowMarker : public nsDisplayItem
+{
+public:
+ nsDisplayTextOverflowMarker(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
+ const nsRect& aRect, nscoord aAscent,
+ const nsStyleTextOverflowSide* aStyle,
+ uint32_t aIndex)
+ : nsDisplayItem(aBuilder, aFrame), mRect(aRect),
+ mStyle(aStyle), mAscent(aAscent), mIndex(aIndex) {
+ MOZ_COUNT_CTOR(nsDisplayTextOverflowMarker);
+ }
+#ifdef NS_BUILD_REFCNT_LOGGING
+ virtual ~nsDisplayTextOverflowMarker() {
+ MOZ_COUNT_DTOR(nsDisplayTextOverflowMarker);
+ }
+#endif
+ virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) override {
+ *aSnap = false;
+ nsRect shadowRect =
+ nsLayoutUtils::GetTextShadowRectsUnion(mRect, mFrame);
+ return mRect.Union(shadowRect);
+ }
+
+ virtual nsRect GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder) override
+ {
+ if (gfxPlatform::GetPlatform()->RespectsFontStyleSmoothing()) {
+ // On OS X, web authors can turn off subpixel text rendering using the
+ // CSS property -moz-osx-font-smoothing. If they do that, we don't need
+ // to use component alpha layers for the affected text.
+ if (mFrame->StyleFont()->mFont.smoothing == NS_FONT_SMOOTHING_GRAYSCALE) {
+ return nsRect();
+ }
+ }
+ bool snap;
+ return GetBounds(aBuilder, &snap);
+ }
+
+ virtual void Paint(nsDisplayListBuilder* aBuilder,
+ nsRenderingContext* aCtx) override;
+
+ virtual uint32_t GetPerFrameKey() override {
+ return (mIndex << nsDisplayItem::TYPE_BITS) | nsDisplayItem::GetPerFrameKey();
+ }
+ void PaintTextToContext(nsRenderingContext* aCtx,
+ nsPoint aOffsetFromRect);
+ NS_DISPLAY_DECL_NAME("TextOverflow", TYPE_TEXT_OVERFLOW)
+private:
+ nsRect mRect; // in reference frame coordinates
+ const nsStyleTextOverflowSide* mStyle;
+ nscoord mAscent; // baseline for the marker text in mRect
+ uint32_t mIndex;
+};
+
+static void
+PaintTextShadowCallback(nsRenderingContext* aCtx,
+ nsPoint aShadowOffset,
+ const nscolor& aShadowColor,
+ void* aData)
+{
+ reinterpret_cast<nsDisplayTextOverflowMarker*>(aData)->
+ PaintTextToContext(aCtx, aShadowOffset);
+}
+
+void
+nsDisplayTextOverflowMarker::Paint(nsDisplayListBuilder* aBuilder,
+ nsRenderingContext* aCtx)
+{
+ nscolor foregroundColor = nsLayoutUtils::
+ GetColor(mFrame, eCSSProperty__webkit_text_fill_color);
+
+ // Paint the text-shadows for the overflow marker
+ nsLayoutUtils::PaintTextShadow(mFrame, aCtx, mRect, mVisibleRect,
+ foregroundColor, PaintTextShadowCallback,
+ (void*)this);
+ aCtx->ThebesContext()->SetColor(gfx::Color::FromABGR(foregroundColor));
+ PaintTextToContext(aCtx, nsPoint(0, 0));
+}
+
+void
+nsDisplayTextOverflowMarker::PaintTextToContext(nsRenderingContext* aCtx,
+ nsPoint aOffsetFromRect)
+{
+ WritingMode wm = mFrame->GetWritingMode();
+ nsPoint pt(mRect.x, mRect.y);
+ if (wm.IsVertical()) {
+ if (wm.IsVerticalLR()) {
+ pt.x = NSToCoordFloor(nsLayoutUtils::GetSnappedBaselineX(
+ mFrame, aCtx->ThebesContext(), pt.x, mAscent));
+ } else {
+ pt.x = NSToCoordFloor(nsLayoutUtils::GetSnappedBaselineX(
+ mFrame, aCtx->ThebesContext(), pt.x + mRect.width, -mAscent));
+ }
+ } else {
+ pt.y = NSToCoordFloor(nsLayoutUtils::GetSnappedBaselineY(
+ mFrame, aCtx->ThebesContext(), pt.y, mAscent));
+ }
+ pt += aOffsetFromRect;
+
+ if (mStyle->mType == NS_STYLE_TEXT_OVERFLOW_ELLIPSIS) {
+ gfxTextRun* textRun = GetEllipsisTextRun(mFrame);
+ if (textRun) {
+ NS_ASSERTION(!textRun->IsRightToLeft(),
+ "Ellipsis textruns should always be LTR!");
+ gfxPoint gfxPt(pt.x, pt.y);
+ textRun->Draw(gfxTextRun::Range(textRun), gfxPt,
+ gfxTextRun::DrawParams(aCtx->ThebesContext()));
+ }
+ } else {
+ RefPtr<nsFontMetrics> fm =
+ nsLayoutUtils::GetInflatedFontMetricsForFrame(mFrame);
+ nsLayoutUtils::DrawString(mFrame, *fm, aCtx, mStyle->mString.get(),
+ mStyle->mString.Length(), pt);
+ }
+}
+
+TextOverflow::TextOverflow(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aBlockFrame)
+ : mContentArea(aBlockFrame->GetWritingMode(),
+ aBlockFrame->GetContentRectRelativeToSelf(),
+ aBlockFrame->GetSize())
+ , mBuilder(aBuilder)
+ , mBlock(aBlockFrame)
+ , mScrollableFrame(nsLayoutUtils::GetScrollableFrameFor(aBlockFrame))
+ , mBlockSize(aBlockFrame->GetSize())
+ , mBlockWM(aBlockFrame->GetWritingMode())
+ , mAdjustForPixelSnapping(false)
+{
+#ifdef MOZ_XUL
+ if (!mScrollableFrame) {
+ nsIAtom* pseudoType = aBlockFrame->StyleContext()->GetPseudo();
+ if (pseudoType == nsCSSAnonBoxes::mozXULAnonymousBlock) {
+ mScrollableFrame =
+ nsLayoutUtils::GetScrollableFrameFor(aBlockFrame->GetParent());
+ // nsXULScrollFrame::ClampAndSetBounds rounds to nearest pixels
+ // for RTL blocks (also for overflow:hidden), so we need to move
+ // the edges 1px outward in ExamineLineFrames to avoid triggering
+ // a text-overflow marker in this case.
+ mAdjustForPixelSnapping = !mBlockWM.IsBidiLTR();
+ }
+ }
+#endif
+ mCanHaveInlineAxisScrollbar = false;
+ if (mScrollableFrame) {
+ auto scrollbarStyle = mBlockWM.IsVertical() ?
+ mScrollableFrame->GetScrollbarStyles().mVertical :
+ mScrollableFrame->GetScrollbarStyles().mHorizontal;
+ mCanHaveInlineAxisScrollbar = scrollbarStyle != NS_STYLE_OVERFLOW_HIDDEN;
+ if (!mAdjustForPixelSnapping) {
+ // Scrolling to the end position can leave some text still overflowing due
+ // to pixel snapping behaviour in our scrolling code.
+ mAdjustForPixelSnapping = mCanHaveInlineAxisScrollbar;
+ }
+ // Use a null containerSize to convert a vector from logical to physical.
+ const nsSize nullContainerSize;
+ mContentArea.MoveBy(mBlockWM,
+ LogicalPoint(mBlockWM,
+ mScrollableFrame->GetScrollPosition(),
+ nullContainerSize));
+ nsIFrame* scrollFrame = do_QueryFrame(mScrollableFrame);
+ scrollFrame->AddStateBits(NS_SCROLLFRAME_INVALIDATE_CONTENTS_ON_SCROLL);
+ }
+ uint8_t direction = aBlockFrame->StyleVisibility()->mDirection;
+ const nsStyleTextReset* style = aBlockFrame->StyleTextReset();
+ if (mBlockWM.IsBidiLTR()) {
+ mIStart.Init(style->mTextOverflow.GetLeft(direction));
+ mIEnd.Init(style->mTextOverflow.GetRight(direction));
+ } else {
+ mIStart.Init(style->mTextOverflow.GetRight(direction));
+ mIEnd.Init(style->mTextOverflow.GetLeft(direction));
+ }
+ // The left/right marker string is setup in ExamineLineFrames when a line
+ // has overflow on that side.
+}
+
+/* static */ TextOverflow*
+TextOverflow::WillProcessLines(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aBlockFrame)
+{
+ if (!CanHaveTextOverflow(aBuilder, aBlockFrame)) {
+ return nullptr;
+ }
+ nsIScrollableFrame* scrollableFrame = nsLayoutUtils::GetScrollableFrameFor(aBlockFrame);
+ if (scrollableFrame && scrollableFrame->IsTransformingByAPZ()) {
+ // If the APZ is actively scrolling this, don't bother with markers.
+ return nullptr;
+ }
+ return new TextOverflow(aBuilder, aBlockFrame);
+}
+
+void
+TextOverflow::ExamineFrameSubtree(nsIFrame* aFrame,
+ const LogicalRect& aContentArea,
+ const LogicalRect& aInsideMarkersArea,
+ FrameHashtable* aFramesToHide,
+ AlignmentEdges* aAlignmentEdges,
+ bool* aFoundVisibleTextOrAtomic,
+ InnerClipEdges* aClippedMarkerEdges)
+{
+ const nsIAtom* frameType = aFrame->GetType();
+ if (frameType == nsGkAtoms::brFrame ||
+ frameType == nsGkAtoms::placeholderFrame) {
+ return;
+ }
+ const bool isAtomic = IsAtomicElement(aFrame, frameType);
+ if (aFrame->StyleVisibility()->IsVisible()) {
+ LogicalRect childRect =
+ GetLogicalScrollableOverflowRectRelativeToBlock(aFrame);
+ bool overflowIStart =
+ childRect.IStart(mBlockWM) < aContentArea.IStart(mBlockWM);
+ bool overflowIEnd =
+ childRect.IEnd(mBlockWM) > aContentArea.IEnd(mBlockWM);
+ if (overflowIStart) {
+ mIStart.mHasOverflow = true;
+ }
+ if (overflowIEnd) {
+ mIEnd.mHasOverflow = true;
+ }
+ if (isAtomic && ((mIStart.mActive && overflowIStart) ||
+ (mIEnd.mActive && overflowIEnd))) {
+ aFramesToHide->PutEntry(aFrame);
+ } else if (isAtomic || frameType == nsGkAtoms::textFrame) {
+ AnalyzeMarkerEdges(aFrame, frameType, aInsideMarkersArea,
+ aFramesToHide, aAlignmentEdges,
+ aFoundVisibleTextOrAtomic,
+ aClippedMarkerEdges);
+ }
+ }
+ if (isAtomic) {
+ return;
+ }
+
+ for (nsIFrame* child : aFrame->PrincipalChildList()) {
+ ExamineFrameSubtree(child, aContentArea, aInsideMarkersArea,
+ aFramesToHide, aAlignmentEdges,
+ aFoundVisibleTextOrAtomic,
+ aClippedMarkerEdges);
+ }
+}
+
+void
+TextOverflow::AnalyzeMarkerEdges(nsIFrame* aFrame,
+ const nsIAtom* aFrameType,
+ const LogicalRect& aInsideMarkersArea,
+ FrameHashtable* aFramesToHide,
+ AlignmentEdges* aAlignmentEdges,
+ bool* aFoundVisibleTextOrAtomic,
+ InnerClipEdges* aClippedMarkerEdges)
+{
+ LogicalRect borderRect(mBlockWM,
+ nsRect(aFrame->GetOffsetTo(mBlock),
+ aFrame->GetSize()),
+ mBlockSize);
+ nscoord istartOverlap = std::max(
+ aInsideMarkersArea.IStart(mBlockWM) - borderRect.IStart(mBlockWM), 0);
+ nscoord iendOverlap = std::max(
+ borderRect.IEnd(mBlockWM) - aInsideMarkersArea.IEnd(mBlockWM), 0);
+ bool insideIStartEdge =
+ aInsideMarkersArea.IStart(mBlockWM) <= borderRect.IEnd(mBlockWM);
+ bool insideIEndEdge =
+ borderRect.IStart(mBlockWM) <= aInsideMarkersArea.IEnd(mBlockWM);
+
+ if (istartOverlap > 0) {
+ aClippedMarkerEdges->AccumulateIStart(mBlockWM, borderRect);
+ if (!mIStart.mActive) {
+ istartOverlap = 0;
+ }
+ }
+ if (iendOverlap > 0) {
+ aClippedMarkerEdges->AccumulateIEnd(mBlockWM, borderRect);
+ if (!mIEnd.mActive) {
+ iendOverlap = 0;
+ }
+ }
+
+ if ((istartOverlap > 0 && insideIStartEdge) ||
+ (iendOverlap > 0 && insideIEndEdge)) {
+ if (aFrameType == nsGkAtoms::textFrame) {
+ if (aInsideMarkersArea.IStart(mBlockWM) <
+ aInsideMarkersArea.IEnd(mBlockWM)) {
+ // a clipped text frame and there is some room between the markers
+ nscoord snappedIStart, snappedIEnd;
+ auto textFrame = static_cast<nsTextFrame*>(aFrame);
+ bool isFullyClipped = mBlockWM.IsBidiLTR() ?
+ IsFullyClipped(textFrame, istartOverlap, iendOverlap,
+ &snappedIStart, &snappedIEnd) :
+ IsFullyClipped(textFrame, iendOverlap, istartOverlap,
+ &snappedIEnd, &snappedIStart);
+ if (!isFullyClipped) {
+ LogicalRect snappedRect = borderRect;
+ if (istartOverlap > 0) {
+ snappedRect.IStart(mBlockWM) += snappedIStart;
+ snappedRect.ISize(mBlockWM) -= snappedIStart;
+ }
+ if (iendOverlap > 0) {
+ snappedRect.ISize(mBlockWM) -= snappedIEnd;
+ }
+ aAlignmentEdges->Accumulate(mBlockWM, snappedRect);
+ *aFoundVisibleTextOrAtomic = true;
+ }
+ }
+ } else {
+ aFramesToHide->PutEntry(aFrame);
+ }
+ } else if (!insideIStartEdge || !insideIEndEdge) {
+ // frame is outside
+ if (IsAtomicElement(aFrame, aFrameType)) {
+ aFramesToHide->PutEntry(aFrame);
+ }
+ } else {
+ // frame is inside
+ aAlignmentEdges->Accumulate(mBlockWM, borderRect);
+ *aFoundVisibleTextOrAtomic = true;
+ }
+}
+
+void
+TextOverflow::ExamineLineFrames(nsLineBox* aLine,
+ FrameHashtable* aFramesToHide,
+ AlignmentEdges* aAlignmentEdges)
+{
+ // No ellipsing for 'clip' style.
+ bool suppressIStart = mIStart.mStyle->mType == NS_STYLE_TEXT_OVERFLOW_CLIP;
+ bool suppressIEnd = mIEnd.mStyle->mType == NS_STYLE_TEXT_OVERFLOW_CLIP;
+ if (mCanHaveInlineAxisScrollbar) {
+ LogicalPoint pos(mBlockWM, mScrollableFrame->GetScrollPosition(),
+ mBlockSize);
+ LogicalRect scrollRange(mBlockWM, mScrollableFrame->GetScrollRange(),
+ mBlockSize);
+ // No ellipsing when nothing to scroll to on that side (this includes
+ // overflow:auto that doesn't trigger a horizontal scrollbar).
+ if (pos.I(mBlockWM) <= scrollRange.IStart(mBlockWM)) {
+ suppressIStart = true;
+ }
+ if (pos.I(mBlockWM) >= scrollRange.IEnd(mBlockWM)) {
+ suppressIEnd = true;
+ }
+ }
+
+ LogicalRect contentArea = mContentArea;
+ const nscoord scrollAdjust = mAdjustForPixelSnapping ?
+ mBlock->PresContext()->AppUnitsPerDevPixel() : 0;
+ InflateIStart(mBlockWM, &contentArea, scrollAdjust);
+ InflateIEnd(mBlockWM, &contentArea, scrollAdjust);
+ LogicalRect lineRect(mBlockWM, aLine->GetScrollableOverflowArea(),
+ mBlockSize);
+ const bool istartOverflow =
+ !suppressIStart && lineRect.IStart(mBlockWM) < contentArea.IStart(mBlockWM);
+ const bool iendOverflow =
+ !suppressIEnd && lineRect.IEnd(mBlockWM) > contentArea.IEnd(mBlockWM);
+ if (!istartOverflow && !iendOverflow) {
+ // The line does not overflow on a side we should ellipsize.
+ return;
+ }
+
+ int pass = 0;
+ bool retryEmptyLine = true;
+ bool guessIStart = istartOverflow;
+ bool guessIEnd = iendOverflow;
+ mIStart.mActive = istartOverflow;
+ mIEnd.mActive = iendOverflow;
+ bool clippedIStartMarker = false;
+ bool clippedIEndMarker = false;
+ do {
+ // Setup marker strings as needed.
+ if (guessIStart) {
+ mIStart.SetupString(mBlock);
+ }
+ if (guessIEnd) {
+ mIEnd.SetupString(mBlock);
+ }
+
+ // If there is insufficient space for both markers then keep the one on the
+ // end side per the block's 'direction'.
+ nscoord istartMarkerISize = mIStart.mActive ? mIStart.mISize : 0;
+ nscoord iendMarkerISize = mIEnd.mActive ? mIEnd.mISize : 0;
+ if (istartMarkerISize && iendMarkerISize &&
+ istartMarkerISize + iendMarkerISize > contentArea.ISize(mBlockWM)) {
+ istartMarkerISize = 0;
+ }
+
+ // Calculate the area between the potential markers aligned at the
+ // block's edge.
+ LogicalRect insideMarkersArea = mContentArea;
+ if (guessIStart) {
+ InflateIStart(mBlockWM, &insideMarkersArea, -istartMarkerISize);
+ }
+ if (guessIEnd) {
+ InflateIEnd(mBlockWM, &insideMarkersArea, -iendMarkerISize);
+ }
+
+ // Analyze the frames on aLine for the overflow situation at the content
+ // edges and at the edges of the area between the markers.
+ bool foundVisibleTextOrAtomic = false;
+ int32_t n = aLine->GetChildCount();
+ nsIFrame* child = aLine->mFirstChild;
+ InnerClipEdges clippedMarkerEdges;
+ for (; n-- > 0; child = child->GetNextSibling()) {
+ ExamineFrameSubtree(child, contentArea, insideMarkersArea,
+ aFramesToHide, aAlignmentEdges,
+ &foundVisibleTextOrAtomic,
+ &clippedMarkerEdges);
+ }
+ if (!foundVisibleTextOrAtomic && retryEmptyLine) {
+ aAlignmentEdges->mAssigned = false;
+ aFramesToHide->Clear();
+ pass = -1;
+ if (mIStart.IsNeeded() && mIStart.mActive && !clippedIStartMarker) {
+ if (clippedMarkerEdges.mAssignedIStart &&
+ clippedMarkerEdges.mIStart > mContentArea.IStart(mBlockWM)) {
+ mIStart.mISize =
+ clippedMarkerEdges.mIStart - mContentArea.IStart(mBlockWM);
+ NS_ASSERTION(mIStart.mISize < mIStart.mIntrinsicISize,
+ "clipping a marker should make it strictly smaller");
+ clippedIStartMarker = true;
+ } else {
+ mIStart.mActive = guessIStart = false;
+ }
+ continue;
+ }
+ if (mIEnd.IsNeeded() && mIEnd.mActive && !clippedIEndMarker) {
+ if (clippedMarkerEdges.mAssignedIEnd &&
+ mContentArea.IEnd(mBlockWM) > clippedMarkerEdges.mIEnd) {
+ mIEnd.mISize = mContentArea.IEnd(mBlockWM) - clippedMarkerEdges.mIEnd;
+ NS_ASSERTION(mIEnd.mISize < mIEnd.mIntrinsicISize,
+ "clipping a marker should make it strictly smaller");
+ clippedIEndMarker = true;
+ } else {
+ mIEnd.mActive = guessIEnd = false;
+ }
+ continue;
+ }
+ // The line simply has no visible content even without markers,
+ // so examine the line again without suppressing markers.
+ retryEmptyLine = false;
+ mIStart.mISize = mIStart.mIntrinsicISize;
+ mIStart.mActive = guessIStart = istartOverflow;
+ mIEnd.mISize = mIEnd.mIntrinsicISize;
+ mIEnd.mActive = guessIEnd = iendOverflow;
+ continue;
+ }
+ if (guessIStart == (mIStart.mActive && mIStart.IsNeeded()) &&
+ guessIEnd == (mIEnd.mActive && mIEnd.IsNeeded())) {
+ break;
+ } else {
+ guessIStart = mIStart.mActive && mIStart.IsNeeded();
+ guessIEnd = mIEnd.mActive && mIEnd.IsNeeded();
+ mIStart.Reset();
+ mIEnd.Reset();
+ aFramesToHide->Clear();
+ }
+ NS_ASSERTION(pass == 0, "2nd pass should never guess wrong");
+ } while (++pass != 2);
+ if (!istartOverflow || !mIStart.mActive) {
+ mIStart.Reset();
+ }
+ if (!iendOverflow || !mIEnd.mActive) {
+ mIEnd.Reset();
+ }
+}
+
+void
+TextOverflow::ProcessLine(const nsDisplayListSet& aLists,
+ nsLineBox* aLine)
+{
+ NS_ASSERTION(mIStart.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP ||
+ mIEnd.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP,
+ "TextOverflow with 'clip' for both sides");
+ mIStart.Reset();
+ mIStart.mActive = mIStart.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP;
+ mIEnd.Reset();
+ mIEnd.mActive = mIEnd.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP;
+
+ FrameHashtable framesToHide(64);
+ AlignmentEdges alignmentEdges;
+ ExamineLineFrames(aLine, &framesToHide, &alignmentEdges);
+ bool needIStart = mIStart.IsNeeded();
+ bool needIEnd = mIEnd.IsNeeded();
+ if (!needIStart && !needIEnd) {
+ return;
+ }
+ NS_ASSERTION(mIStart.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP ||
+ !needIStart, "left marker for 'clip'");
+ NS_ASSERTION(mIEnd.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP ||
+ !needIEnd, "right marker for 'clip'");
+
+ // If there is insufficient space for both markers then keep the one on the
+ // end side per the block's 'direction'.
+ if (needIStart && needIEnd &&
+ mIStart.mISize + mIEnd.mISize > mContentArea.ISize(mBlockWM)) {
+ needIStart = false;
+ }
+ LogicalRect insideMarkersArea = mContentArea;
+ if (needIStart) {
+ InflateIStart(mBlockWM, &insideMarkersArea, -mIStart.mISize);
+ }
+ if (needIEnd) {
+ InflateIEnd(mBlockWM, &insideMarkersArea, -mIEnd.mISize);
+ }
+ if (!mCanHaveInlineAxisScrollbar && alignmentEdges.mAssigned) {
+ LogicalRect alignmentRect(mBlockWM, alignmentEdges.mIStart,
+ insideMarkersArea.BStart(mBlockWM),
+ alignmentEdges.ISize(), 1);
+ insideMarkersArea.IntersectRect(insideMarkersArea, alignmentRect);
+ }
+
+ // Clip and remove display items as needed at the final marker edges.
+ nsDisplayList* lists[] = { aLists.Content(), aLists.PositionedDescendants() };
+ for (uint32_t i = 0; i < ArrayLength(lists); ++i) {
+ PruneDisplayListContents(lists[i], framesToHide, insideMarkersArea);
+ }
+ CreateMarkers(aLine, needIStart, needIEnd, insideMarkersArea);
+}
+
+void
+TextOverflow::PruneDisplayListContents(nsDisplayList* aList,
+ const FrameHashtable& aFramesToHide,
+ const LogicalRect& aInsideMarkersArea)
+{
+ nsDisplayList saved;
+ nsDisplayItem* item;
+ while ((item = aList->RemoveBottom())) {
+ nsIFrame* itemFrame = item->Frame();
+ if (IsFrameDescendantOfAny(itemFrame, aFramesToHide, mBlock)) {
+ item->~nsDisplayItem();
+ continue;
+ }
+
+ nsDisplayList* wrapper = item->GetSameCoordinateSystemChildren();
+ if (wrapper) {
+ if (!itemFrame || GetSelfOrNearestBlock(itemFrame) == mBlock) {
+ PruneDisplayListContents(wrapper, aFramesToHide, aInsideMarkersArea);
+ }
+ }
+
+ nsCharClipDisplayItem* charClip = itemFrame ?
+ nsCharClipDisplayItem::CheckCast(item) : nullptr;
+ if (charClip && GetSelfOrNearestBlock(itemFrame) == mBlock) {
+ LogicalRect rect =
+ GetLogicalScrollableOverflowRectRelativeToBlock(itemFrame);
+ if (mIStart.IsNeeded()) {
+ nscoord istart =
+ aInsideMarkersArea.IStart(mBlockWM) - rect.IStart(mBlockWM);
+ if (istart > 0) {
+ (mBlockWM.IsBidiLTR() ?
+ charClip->mVisIStartEdge : charClip->mVisIEndEdge) = istart;
+ }
+ }
+ if (mIEnd.IsNeeded()) {
+ nscoord iend = rect.IEnd(mBlockWM) - aInsideMarkersArea.IEnd(mBlockWM);
+ if (iend > 0) {
+ (mBlockWM.IsBidiLTR() ?
+ charClip->mVisIEndEdge : charClip->mVisIStartEdge) = iend;
+ }
+ }
+ }
+
+ saved.AppendToTop(item);
+ }
+ aList->AppendToTop(&saved);
+}
+
+/* static */ bool
+TextOverflow::HasClippedOverflow(nsIFrame* aBlockFrame)
+{
+ const nsStyleTextReset* style = aBlockFrame->StyleTextReset();
+ return style->mTextOverflow.mLeft.mType == NS_STYLE_TEXT_OVERFLOW_CLIP &&
+ style->mTextOverflow.mRight.mType == NS_STYLE_TEXT_OVERFLOW_CLIP;
+}
+
+/* static */ bool
+TextOverflow::CanHaveTextOverflow(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aBlockFrame)
+{
+ // Nothing to do for text-overflow:clip or if 'overflow-x/y:visible' or if
+ // we're just building items for event processing or frame visibility.
+ if (HasClippedOverflow(aBlockFrame) ||
+ IsInlineAxisOverflowVisible(aBlockFrame) ||
+ aBuilder->IsForEventDelivery() ||
+ aBuilder->IsForFrameVisibility()) {
+ return false;
+ }
+
+ // Skip ComboboxControlFrame because it would clip the drop-down arrow.
+ // Its anon block inherits 'text-overflow' and does what is expected.
+ if (aBlockFrame->GetType() == nsGkAtoms::comboboxControlFrame) {
+ return false;
+ }
+
+ // Inhibit the markers if a descendant content owns the caret.
+ RefPtr<nsCaret> caret = aBlockFrame->PresContext()->PresShell()->GetCaret();
+ if (caret && caret->IsVisible()) {
+ nsCOMPtr<nsISelection> domSelection = caret->GetSelection();
+ if (domSelection) {
+ nsCOMPtr<nsIDOMNode> node;
+ domSelection->GetFocusNode(getter_AddRefs(node));
+ nsCOMPtr<nsIContent> content = do_QueryInterface(node);
+ if (content && nsContentUtils::ContentIsDescendantOf(content,
+ aBlockFrame->GetContent())) {
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+void
+TextOverflow::CreateMarkers(const nsLineBox* aLine,
+ bool aCreateIStart, bool aCreateIEnd,
+ const mozilla::LogicalRect& aInsideMarkersArea)
+{
+ if (aCreateIStart) {
+ DisplayListClipState::AutoSaveRestore clipState(mBuilder);
+
+ LogicalRect markerLogicalRect(
+ mBlockWM, aInsideMarkersArea.IStart(mBlockWM) - mIStart.mIntrinsicISize,
+ aLine->BStart(), mIStart.mIntrinsicISize, aLine->BSize());
+ nsPoint offset = mBuilder->ToReferenceFrame(mBlock);
+ nsRect markerRect =
+ markerLogicalRect.GetPhysicalRect(mBlockWM, mBlockSize) + offset;
+ ClipMarker(mContentArea.GetPhysicalRect(mBlockWM, mBlockSize) + offset,
+ markerRect, clipState);
+ nsDisplayItem* marker = new (mBuilder)
+ nsDisplayTextOverflowMarker(mBuilder, mBlock, markerRect,
+ aLine->GetLogicalAscent(), mIStart.mStyle, 0);
+ mMarkerList.AppendNewToTop(marker);
+ }
+
+ if (aCreateIEnd) {
+ DisplayListClipState::AutoSaveRestore clipState(mBuilder);
+
+ LogicalRect markerLogicalRect(
+ mBlockWM, aInsideMarkersArea.IEnd(mBlockWM), aLine->BStart(),
+ mIEnd.mIntrinsicISize, aLine->BSize());
+ nsPoint offset = mBuilder->ToReferenceFrame(mBlock);
+ nsRect markerRect =
+ markerLogicalRect.GetPhysicalRect(mBlockWM, mBlockSize) + offset;
+ ClipMarker(mContentArea.GetPhysicalRect(mBlockWM, mBlockSize) + offset,
+ markerRect, clipState);
+ nsDisplayItem* marker = new (mBuilder)
+ nsDisplayTextOverflowMarker(mBuilder, mBlock, markerRect,
+ aLine->GetLogicalAscent(), mIEnd.mStyle, 1);
+ mMarkerList.AppendNewToTop(marker);
+ }
+}
+
+void
+TextOverflow::Marker::SetupString(nsIFrame* aFrame)
+{
+ if (mInitialized) {
+ return;
+ }
+
+ if (mStyle->mType == NS_STYLE_TEXT_OVERFLOW_ELLIPSIS) {
+ gfxTextRun* textRun = GetEllipsisTextRun(aFrame);
+ if (textRun) {
+ mISize = textRun->GetAdvanceWidth();
+ } else {
+ mISize = 0;
+ }
+ } else {
+ nsRenderingContext rc(
+ aFrame->PresContext()->PresShell()->CreateReferenceRenderingContext());
+ RefPtr<nsFontMetrics> fm =
+ nsLayoutUtils::GetInflatedFontMetricsForFrame(aFrame);
+ mISize = nsLayoutUtils::AppUnitWidthOfStringBidi(mStyle->mString, aFrame,
+ *fm, rc);
+ }
+ mIntrinsicISize = mISize;
+ mInitialized = true;
+}
+
+} // namespace css
+} // namespace mozilla