зеркало из https://github.com/mozilla/gecko-dev.git
948 строки
36 KiB
C++
948 строки
36 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "TextOverflow.h"
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#include <algorithm>
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// Please maintain alphabetical order below
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#include "gfxContext.h"
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#include "nsBlockFrame.h"
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#include "nsCaret.h"
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#include "nsContentUtils.h"
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#include "nsCSSAnonBoxes.h"
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#include "nsFontMetrics.h"
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#include "nsGfxScrollFrame.h"
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#include "nsIScrollableFrame.h"
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#include "nsLayoutUtils.h"
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#include "nsPresContext.h"
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#include "nsRect.h"
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#include "nsTextFrame.h"
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#include "nsIFrameInlines.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/Likely.h"
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#include "mozilla/PresShell.h"
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#include "mozilla/dom/Selection.h"
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#include "TextDrawTarget.h"
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using mozilla::layout::TextDrawTarget;
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namespace mozilla {
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namespace css {
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class LazyReferenceRenderingDrawTargetGetterFromFrame final
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: public gfxFontGroup::LazyReferenceDrawTargetGetter {
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public:
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typedef mozilla::gfx::DrawTarget DrawTarget;
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explicit LazyReferenceRenderingDrawTargetGetterFromFrame(nsIFrame* aFrame)
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: mFrame(aFrame) {}
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virtual already_AddRefed<DrawTarget> GetRefDrawTarget() override {
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RefPtr<gfxContext> ctx =
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mFrame->PresShell()->CreateReferenceRenderingContext();
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RefPtr<DrawTarget> dt = ctx->GetDrawTarget();
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return dt.forget();
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}
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private:
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nsIFrame* mFrame;
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};
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static gfxTextRun* GetEllipsisTextRun(nsIFrame* aFrame) {
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RefPtr<nsFontMetrics> fm =
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nsLayoutUtils::GetInflatedFontMetricsForFrame(aFrame);
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LazyReferenceRenderingDrawTargetGetterFromFrame lazyRefDrawTargetGetter(
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aFrame);
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return fm->GetThebesFontGroup()->GetEllipsisTextRun(
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aFrame->PresContext()->AppUnitsPerDevPixel(),
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nsLayoutUtils::GetTextRunOrientFlagsForStyle(aFrame->Style()),
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lazyRefDrawTargetGetter);
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}
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static nsIFrame* GetSelfOrNearestBlock(nsIFrame* aFrame) {
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MOZ_ASSERT(aFrame);
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return aFrame->IsBlockFrameOrSubclass()
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? aFrame
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: nsLayoutUtils::FindNearestBlockAncestor(aFrame);
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}
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// Return true if the frame is an atomic inline-level element.
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// It's not supposed to be called for block frames since we never
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// process block descendants for text-overflow.
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static bool IsAtomicElement(nsIFrame* aFrame, LayoutFrameType aFrameType) {
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MOZ_ASSERT(!aFrame->IsBlockFrameOrSubclass() || !aFrame->IsBlockOutside(),
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"unexpected block frame");
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MOZ_ASSERT(aFrameType != LayoutFrameType::Placeholder,
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"unexpected placeholder frame");
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return !aFrame->IsFrameOfType(nsIFrame::eLineParticipant);
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}
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static bool IsFullyClipped(nsTextFrame* aFrame, nscoord aLeft, nscoord aRight,
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nscoord* aSnappedLeft, nscoord* aSnappedRight) {
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*aSnappedLeft = aLeft;
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*aSnappedRight = aRight;
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if (aLeft <= 0 && aRight <= 0) {
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return false;
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}
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return !aFrame->MeasureCharClippedText(aLeft, aRight, aSnappedLeft,
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aSnappedRight);
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}
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static bool IsInlineAxisOverflowVisible(nsIFrame* aFrame) {
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MOZ_ASSERT(aFrame && aFrame->IsBlockFrameOrSubclass(),
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"expected a block frame");
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nsIFrame* f = aFrame;
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while (f && f->Style()->IsAnonBox() && !f->IsScrollFrame()) {
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f = f->GetParent();
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}
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if (!f) {
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return true;
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}
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auto overflow = aFrame->GetWritingMode().IsVertical()
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? f->StyleDisplay()->mOverflowY
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: f->StyleDisplay()->mOverflowX;
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return overflow == StyleOverflow::Visible;
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}
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static void ClipMarker(const nsRect& aContentArea, const nsRect& aMarkerRect,
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DisplayListClipState::AutoSaveRestore& aClipState) {
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nscoord rightOverflow = aMarkerRect.XMost() - aContentArea.XMost();
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nsRect markerRect = aMarkerRect;
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if (rightOverflow > 0) {
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// Marker overflows on the right side (content width < marker width).
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markerRect.width -= rightOverflow;
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aClipState.ClipContentDescendants(markerRect);
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} else {
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nscoord leftOverflow = aContentArea.x - aMarkerRect.x;
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if (leftOverflow > 0) {
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// Marker overflows on the left side
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markerRect.width -= leftOverflow;
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markerRect.x += leftOverflow;
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aClipState.ClipContentDescendants(markerRect);
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}
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}
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}
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static void InflateIStart(WritingMode aWM, LogicalRect* aRect, nscoord aDelta) {
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nscoord iend = aRect->IEnd(aWM);
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aRect->IStart(aWM) -= aDelta;
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aRect->ISize(aWM) = std::max(iend - aRect->IStart(aWM), 0);
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}
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static void InflateIEnd(WritingMode aWM, LogicalRect* aRect, nscoord aDelta) {
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aRect->ISize(aWM) = std::max(aRect->ISize(aWM) + aDelta, 0);
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}
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static bool IsFrameDescendantOfAny(
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nsIFrame* aChild, const TextOverflow::FrameHashtable& aSetOfFrames,
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nsIFrame* aCommonAncestor) {
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for (nsIFrame* f = aChild; f && f != aCommonAncestor;
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f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
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if (aSetOfFrames.GetEntry(f)) {
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return true;
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}
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}
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return false;
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}
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class nsDisplayTextOverflowMarker final : public nsPaintedDisplayItem {
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public:
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nsDisplayTextOverflowMarker(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
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const nsRect& aRect, nscoord aAscent,
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const StyleTextOverflowSide& aStyle,
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uint32_t aLineNumber, uint16_t aIndex)
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: nsPaintedDisplayItem(aBuilder, aFrame),
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mRect(aRect),
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mStyle(aStyle),
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mAscent(aAscent),
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mIndex((aLineNumber << 1) + aIndex) {
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MOZ_COUNT_CTOR(nsDisplayTextOverflowMarker);
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}
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#ifdef NS_BUILD_REFCNT_LOGGING
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virtual ~nsDisplayTextOverflowMarker() {
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MOZ_COUNT_DTOR(nsDisplayTextOverflowMarker);
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}
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#endif
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virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
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bool* aSnap) const override {
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*aSnap = false;
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nsRect shadowRect = nsLayoutUtils::GetTextShadowRectsUnion(mRect, mFrame);
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return mRect.Union(shadowRect);
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}
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virtual nsRect GetComponentAlphaBounds(
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nsDisplayListBuilder* aBuilder) const override {
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if (gfxPlatform::GetPlatform()->RespectsFontStyleSmoothing()) {
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// On OS X, web authors can turn off subpixel text rendering using the
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// CSS property -moz-osx-font-smoothing. If they do that, we don't need
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// to use component alpha layers for the affected text.
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if (mFrame->StyleFont()->mFont.smoothing == NS_FONT_SMOOTHING_GRAYSCALE) {
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return nsRect();
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}
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}
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bool snap;
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return GetBounds(aBuilder, &snap);
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}
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virtual void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override;
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virtual uint16_t CalculatePerFrameKey() const override { return mIndex; }
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void PaintTextToContext(gfxContext* aCtx, nsPoint aOffsetFromRect);
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virtual bool CreateWebRenderCommands(
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mozilla::wr::DisplayListBuilder& aBuilder,
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mozilla::wr::IpcResourceUpdateQueue& aResources,
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const StackingContextHelper& aSc,
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layers::RenderRootStateManager* aManager,
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nsDisplayListBuilder* aDisplayListBuilder) override;
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NS_DISPLAY_DECL_NAME("TextOverflow", TYPE_TEXT_OVERFLOW)
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private:
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nsRect mRect; // in reference frame coordinates
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const StyleTextOverflowSide mStyle;
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nscoord mAscent; // baseline for the marker text in mRect
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uint16_t mIndex;
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};
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static void PaintTextShadowCallback(gfxContext* aCtx, nsPoint aShadowOffset,
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const nscolor& aShadowColor, void* aData) {
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reinterpret_cast<nsDisplayTextOverflowMarker*>(aData)->PaintTextToContext(
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aCtx, aShadowOffset);
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}
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void nsDisplayTextOverflowMarker::Paint(nsDisplayListBuilder* aBuilder,
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gfxContext* aCtx) {
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DrawTargetAutoDisableSubpixelAntialiasing disable(aCtx->GetDrawTarget(),
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IsSubpixelAADisabled());
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nscolor foregroundColor =
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nsLayoutUtils::GetColor(mFrame, &nsStyleText::mWebkitTextFillColor);
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// Paint the text-shadows for the overflow marker
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nsLayoutUtils::PaintTextShadow(mFrame, aCtx, mRect, GetPaintRect(),
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foregroundColor, PaintTextShadowCallback,
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(void*)this);
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aCtx->SetColor(gfx::sRGBColor::FromABGR(foregroundColor));
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PaintTextToContext(aCtx, nsPoint(0, 0));
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}
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void nsDisplayTextOverflowMarker::PaintTextToContext(gfxContext* aCtx,
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nsPoint aOffsetFromRect) {
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WritingMode wm = mFrame->GetWritingMode();
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nsPoint pt(mRect.x, mRect.y);
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if (wm.IsVertical()) {
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if (wm.IsVerticalLR()) {
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pt.x = NSToCoordFloor(
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nsLayoutUtils::GetSnappedBaselineX(mFrame, aCtx, pt.x, mAscent));
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} else {
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pt.x = NSToCoordFloor(nsLayoutUtils::GetSnappedBaselineX(
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mFrame, aCtx, pt.x + mRect.width, -mAscent));
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}
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} else {
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pt.y = NSToCoordFloor(
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nsLayoutUtils::GetSnappedBaselineY(mFrame, aCtx, pt.y, mAscent));
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}
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pt += aOffsetFromRect;
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if (mStyle.IsEllipsis()) {
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gfxTextRun* textRun = GetEllipsisTextRun(mFrame);
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if (textRun) {
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NS_ASSERTION(!textRun->IsRightToLeft(),
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"Ellipsis textruns should always be LTR!");
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gfx::Point gfxPt(pt.x, pt.y);
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textRun->Draw(gfxTextRun::Range(textRun), gfxPt,
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gfxTextRun::DrawParams(aCtx));
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}
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} else {
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RefPtr<nsFontMetrics> fm =
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nsLayoutUtils::GetInflatedFontMetricsForFrame(mFrame);
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NS_ConvertUTF8toUTF16 str16{mStyle.AsString().AsString()};
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nsLayoutUtils::DrawString(mFrame, *fm, aCtx, str16.get(), str16.Length(),
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pt);
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}
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}
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bool nsDisplayTextOverflowMarker::CreateWebRenderCommands(
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mozilla::wr::DisplayListBuilder& aBuilder,
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mozilla::wr::IpcResourceUpdateQueue& aResources,
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const StackingContextHelper& aSc, layers::RenderRootStateManager* aManager,
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nsDisplayListBuilder* aDisplayListBuilder) {
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bool snap;
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nsRect bounds = GetBounds(aDisplayListBuilder, &snap);
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if (bounds.IsEmpty()) {
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return true;
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}
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// Run the rendering algorithm to capture the glyphs and shadows
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RefPtr<TextDrawTarget> textDrawer =
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new TextDrawTarget(aBuilder, aResources, aSc, aManager, this, bounds);
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RefPtr<gfxContext> captureCtx = gfxContext::CreateOrNull(textDrawer);
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Paint(aDisplayListBuilder, captureCtx);
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textDrawer->TerminateShadows();
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return textDrawer->Finish();
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}
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TextOverflow::TextOverflow(nsDisplayListBuilder* aBuilder,
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nsIFrame* aBlockFrame)
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: mContentArea(aBlockFrame->GetWritingMode(),
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aBlockFrame->GetContentRectRelativeToSelf(),
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aBlockFrame->GetSize()),
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mBuilder(aBuilder),
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mBlock(aBlockFrame),
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mScrollableFrame(nsLayoutUtils::GetScrollableFrameFor(aBlockFrame)),
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mBlockSize(aBlockFrame->GetSize()),
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mBlockWM(aBlockFrame->GetWritingMode()),
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mAdjustForPixelSnapping(false) {
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#ifdef MOZ_XUL
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if (!mScrollableFrame) {
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auto pseudoType = aBlockFrame->Style()->GetPseudoType();
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if (pseudoType == PseudoStyleType::mozXULAnonymousBlock) {
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mScrollableFrame =
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nsLayoutUtils::GetScrollableFrameFor(aBlockFrame->GetParent());
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// nsXULScrollFrame::ClampAndSetBounds rounds to nearest pixels
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// for RTL blocks (also for overflow:hidden), so we need to move
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// the edges 1px outward in ExamineLineFrames to avoid triggering
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// a text-overflow marker in this case.
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mAdjustForPixelSnapping = mBlockWM.IsBidiRTL();
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}
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}
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#endif
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mCanHaveInlineAxisScrollbar = false;
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if (mScrollableFrame) {
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auto scrollbarStyle = mBlockWM.IsVertical()
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? mScrollableFrame->GetScrollStyles().mVertical
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: mScrollableFrame->GetScrollStyles().mHorizontal;
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mCanHaveInlineAxisScrollbar = scrollbarStyle != StyleOverflow::Hidden;
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if (!mAdjustForPixelSnapping) {
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// Scrolling to the end position can leave some text still overflowing due
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// to pixel snapping behaviour in our scrolling code.
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mAdjustForPixelSnapping = mCanHaveInlineAxisScrollbar;
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}
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// Use a null containerSize to convert a vector from logical to physical.
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const nsSize nullContainerSize;
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mContentArea.MoveBy(
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mBlockWM, LogicalPoint(mBlockWM, mScrollableFrame->GetScrollPosition(),
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nullContainerSize));
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}
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StyleDirection direction = aBlockFrame->StyleVisibility()->mDirection;
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const nsStyleTextReset* style = aBlockFrame->StyleTextReset();
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const auto& textOverflow = style->mTextOverflow;
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bool shouldToggleDirection =
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textOverflow.sides_are_logical && (direction == StyleDirection::Rtl);
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const auto& leftSide =
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shouldToggleDirection ? textOverflow.second : textOverflow.first;
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const auto& rightSide =
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shouldToggleDirection ? textOverflow.first : textOverflow.second;
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if (mBlockWM.IsBidiLTR()) {
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mIStart.Init(leftSide);
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mIEnd.Init(rightSide);
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} else {
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mIStart.Init(rightSide);
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mIEnd.Init(leftSide);
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}
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// The left/right marker string is setup in ExamineLineFrames when a line
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// has overflow on that side.
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}
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/* static */
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Maybe<TextOverflow> TextOverflow::WillProcessLines(
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nsDisplayListBuilder* aBuilder, nsIFrame* aBlockFrame) {
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// Ignore text-overflow and -webkit-line-clamp for event and frame visibility
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// processing.
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if (aBuilder->IsForEventDelivery() || aBuilder->IsForFrameVisibility() ||
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!CanHaveOverflowMarkers(aBlockFrame)) {
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return Nothing();
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}
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nsIScrollableFrame* scrollableFrame =
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nsLayoutUtils::GetScrollableFrameFor(aBlockFrame);
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if (scrollableFrame && scrollableFrame->IsTransformingByAPZ()) {
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// If the APZ is actively scrolling this, don't bother with markers.
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return Nothing();
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}
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return Some(TextOverflow(aBuilder, aBlockFrame));
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}
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void TextOverflow::ExamineFrameSubtree(nsIFrame* aFrame,
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const LogicalRect& aContentArea,
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const LogicalRect& aInsideMarkersArea,
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FrameHashtable* aFramesToHide,
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AlignmentEdges* aAlignmentEdges,
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bool* aFoundVisibleTextOrAtomic,
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InnerClipEdges* aClippedMarkerEdges) {
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const LayoutFrameType frameType = aFrame->Type();
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if (frameType == LayoutFrameType::Br ||
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frameType == LayoutFrameType::Placeholder) {
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return;
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}
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const bool isAtomic = IsAtomicElement(aFrame, frameType);
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if (aFrame->StyleVisibility()->IsVisible()) {
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LogicalRect childRect =
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GetLogicalScrollableOverflowRectRelativeToBlock(aFrame);
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bool overflowIStart =
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childRect.IStart(mBlockWM) < aContentArea.IStart(mBlockWM);
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bool overflowIEnd = childRect.IEnd(mBlockWM) > aContentArea.IEnd(mBlockWM);
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if (overflowIStart) {
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mIStart.mHasOverflow = true;
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}
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if (overflowIEnd) {
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mIEnd.mHasOverflow = true;
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}
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if (isAtomic && ((mIStart.mActive && overflowIStart) ||
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(mIEnd.mActive && overflowIEnd))) {
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aFramesToHide->PutEntry(aFrame);
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} else if (isAtomic || frameType == LayoutFrameType::Text) {
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AnalyzeMarkerEdges(aFrame, frameType, aInsideMarkersArea, aFramesToHide,
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aAlignmentEdges, aFoundVisibleTextOrAtomic,
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aClippedMarkerEdges);
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}
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}
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if (isAtomic) {
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return;
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}
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for (nsIFrame* child : aFrame->PrincipalChildList()) {
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ExamineFrameSubtree(child, aContentArea, aInsideMarkersArea, aFramesToHide,
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aAlignmentEdges, aFoundVisibleTextOrAtomic,
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aClippedMarkerEdges);
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}
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}
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void TextOverflow::AnalyzeMarkerEdges(nsIFrame* aFrame,
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LayoutFrameType aFrameType,
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const LogicalRect& aInsideMarkersArea,
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FrameHashtable* aFramesToHide,
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AlignmentEdges* aAlignmentEdges,
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bool* aFoundVisibleTextOrAtomic,
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InnerClipEdges* aClippedMarkerEdges) {
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MOZ_ASSERT(aFrameType == LayoutFrameType::Text ||
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IsAtomicElement(aFrame, aFrameType));
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LogicalRect borderRect(mBlockWM,
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nsRect(aFrame->GetOffsetTo(mBlock), aFrame->GetSize()),
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mBlockSize);
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nscoord istartOverlap = std::max(
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aInsideMarkersArea.IStart(mBlockWM) - borderRect.IStart(mBlockWM), 0);
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nscoord iendOverlap = std::max(
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borderRect.IEnd(mBlockWM) - aInsideMarkersArea.IEnd(mBlockWM), 0);
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bool insideIStartEdge =
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aInsideMarkersArea.IStart(mBlockWM) <= borderRect.IEnd(mBlockWM);
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bool insideIEndEdge =
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borderRect.IStart(mBlockWM) <= aInsideMarkersArea.IEnd(mBlockWM);
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if (istartOverlap > 0) {
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aClippedMarkerEdges->AccumulateIStart(mBlockWM, borderRect);
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if (!mIStart.mActive) {
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istartOverlap = 0;
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}
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}
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if (iendOverlap > 0) {
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aClippedMarkerEdges->AccumulateIEnd(mBlockWM, borderRect);
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if (!mIEnd.mActive) {
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iendOverlap = 0;
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}
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}
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if ((istartOverlap > 0 && insideIStartEdge) ||
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(iendOverlap > 0 && insideIEndEdge)) {
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if (aFrameType == LayoutFrameType::Text) {
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auto textFrame = static_cast<nsTextFrame*>(aFrame);
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if ((aInsideMarkersArea.IStart(mBlockWM) <
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aInsideMarkersArea.IEnd(mBlockWM)) &&
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textFrame->HasNonSuppressedText()) {
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// a clipped text frame and there is some room between the markers
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nscoord snappedIStart, snappedIEnd;
|
|
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->AccumulateInner(mBlockWM, snappedRect);
|
|
*aFoundVisibleTextOrAtomic = true;
|
|
}
|
|
}
|
|
} else {
|
|
aFramesToHide->PutEntry(aFrame);
|
|
}
|
|
} else if (!insideIStartEdge || !insideIEndEdge) {
|
|
// frame is outside
|
|
if (!insideIStartEdge) {
|
|
aAlignmentEdges->AccumulateOuter(mBlockWM, borderRect);
|
|
}
|
|
if (IsAtomicElement(aFrame, aFrameType)) {
|
|
aFramesToHide->PutEntry(aFrame);
|
|
}
|
|
} else {
|
|
// frame is inside
|
|
aAlignmentEdges->AccumulateInner(mBlockWM, borderRect);
|
|
if (aFrameType == LayoutFrameType::Text) {
|
|
auto textFrame = static_cast<nsTextFrame*>(aFrame);
|
|
if (textFrame->HasNonSuppressedText()) {
|
|
*aFoundVisibleTextOrAtomic = true;
|
|
}
|
|
} else {
|
|
*aFoundVisibleTextOrAtomic = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
LogicalRect TextOverflow::ExamineLineFrames(nsLineBox* aLine,
|
|
FrameHashtable* aFramesToHide,
|
|
AlignmentEdges* aAlignmentEdges) {
|
|
// No ellipsing for 'clip' style.
|
|
bool suppressIStart = mIStart.IsSuppressed();
|
|
bool suppressIEnd = mIEnd.IsSuppressed();
|
|
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)) {
|
|
// Except that we always want to display a -webkit-line-clamp ellipsis.
|
|
if (!mIEnd.mHasBlockEllipsis) {
|
|
suppressIEnd = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
LogicalRect contentArea = mContentArea;
|
|
bool snapStart = true, snapEnd = true;
|
|
nscoord startEdge, endEdge;
|
|
if (aLine->GetFloatEdges(&startEdge, &endEdge)) {
|
|
// Narrow the |contentArea| to account for any floats on this line, and
|
|
// don't bother with the snapping quirk on whichever side(s) we narrow.
|
|
nscoord delta = endEdge - contentArea.IEnd(mBlockWM);
|
|
if (delta < 0) {
|
|
nscoord newSize = contentArea.ISize(mBlockWM) + delta;
|
|
contentArea.ISize(mBlockWM) = std::max(nscoord(0), newSize);
|
|
snapEnd = false;
|
|
}
|
|
delta = startEdge - contentArea.IStart(mBlockWM);
|
|
if (delta > 0) {
|
|
contentArea.IStart(mBlockWM) = startEdge;
|
|
nscoord newSize = contentArea.ISize(mBlockWM) - delta;
|
|
contentArea.ISize(mBlockWM) = std::max(nscoord(0), newSize);
|
|
snapStart = false;
|
|
}
|
|
}
|
|
// Save the non-snapped area since that's what we want to use when placing
|
|
// the markers (our return value). The snapped area is only for analysis.
|
|
LogicalRect nonSnappedContentArea = contentArea;
|
|
if (mAdjustForPixelSnapping) {
|
|
const nscoord scrollAdjust = mBlock->PresContext()->AppUnitsPerDevPixel();
|
|
if (snapStart) {
|
|
InflateIStart(mBlockWM, &contentArea, scrollAdjust);
|
|
}
|
|
if (snapEnd) {
|
|
InflateIEnd(mBlockWM, &contentArea, scrollAdjust);
|
|
}
|
|
}
|
|
|
|
LogicalRect lineRect(mBlockWM, aLine->GetScrollableOverflowArea(),
|
|
mBlockSize);
|
|
const bool istartWantsMarker =
|
|
!suppressIStart &&
|
|
lineRect.IStart(mBlockWM) < contentArea.IStart(mBlockWM);
|
|
const bool iendWantsTextOverflowMarker =
|
|
!suppressIEnd && lineRect.IEnd(mBlockWM) > contentArea.IEnd(mBlockWM);
|
|
const bool iendWantsBlockEllipsisMarker =
|
|
!suppressIEnd && mIEnd.mHasBlockEllipsis;
|
|
const bool iendWantsMarker =
|
|
iendWantsTextOverflowMarker || iendWantsBlockEllipsisMarker;
|
|
if (!istartWantsMarker && !iendWantsMarker) {
|
|
// We don't need any markers on this line.
|
|
return nonSnappedContentArea;
|
|
}
|
|
|
|
int pass = 0;
|
|
bool retryEmptyLine = true;
|
|
bool guessIStart = istartWantsMarker;
|
|
bool guessIEnd = iendWantsMarker;
|
|
mIStart.mActive = istartWantsMarker;
|
|
mIEnd.mActive = iendWantsMarker;
|
|
mIStart.mEdgeAligned = mCanHaveInlineAxisScrollbar && istartWantsMarker;
|
|
mIEnd.mEdgeAligned =
|
|
mCanHaveInlineAxisScrollbar && iendWantsTextOverflowMarker;
|
|
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 = nonSnappedContentArea;
|
|
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->mAssignedInner = false;
|
|
aAlignmentEdges->mIEndOuter = 0;
|
|
aFramesToHide->Clear();
|
|
pass = -1;
|
|
if (mIStart.IsNeeded() && mIStart.mActive && !clippedIStartMarker) {
|
|
if (clippedMarkerEdges.mAssignedIStart &&
|
|
clippedMarkerEdges.mIStart >
|
|
nonSnappedContentArea.IStart(mBlockWM)) {
|
|
mIStart.mISize = clippedMarkerEdges.mIStart -
|
|
nonSnappedContentArea.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 &&
|
|
nonSnappedContentArea.IEnd(mBlockWM) > clippedMarkerEdges.mIEnd) {
|
|
mIEnd.mISize =
|
|
nonSnappedContentArea.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 = istartWantsMarker;
|
|
mIEnd.mISize = mIEnd.mIntrinsicISize;
|
|
mIEnd.mActive = guessIEnd = iendWantsMarker;
|
|
// If we wanted to place a block ellipsis but didn't, due to not having
|
|
// any visible content to align to or the line's content being scrolled
|
|
// out of view, then clip the ellipsis so that it looks like it is aligned
|
|
// with the out of view content.
|
|
if (mIEnd.IsNeeded() && mIEnd.mActive && mIEnd.mHasBlockEllipsis) {
|
|
NS_ASSERTION(nonSnappedContentArea.IStart(mBlockWM) >
|
|
aAlignmentEdges->mIEndOuter,
|
|
"Expected the alignment edge for the out of view content "
|
|
"to be before the start of the content area");
|
|
mIEnd.mISize = std::max(
|
|
mIEnd.mIntrinsicISize - (nonSnappedContentArea.IStart(mBlockWM) -
|
|
aAlignmentEdges->mIEndOuter),
|
|
0);
|
|
}
|
|
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 (!istartWantsMarker || !mIStart.mActive) {
|
|
mIStart.Reset();
|
|
}
|
|
if (!iendWantsMarker || !mIEnd.mActive) {
|
|
mIEnd.Reset();
|
|
}
|
|
return nonSnappedContentArea;
|
|
}
|
|
|
|
void TextOverflow::ProcessLine(const nsDisplayListSet& aLists, nsLineBox* aLine,
|
|
uint32_t aLineNumber) {
|
|
if (mIStart.mStyle->IsClip() && mIEnd.mStyle->IsClip() &&
|
|
!aLine->HasLineClampEllipsis()) {
|
|
return;
|
|
}
|
|
|
|
mIStart.Reset();
|
|
mIStart.mActive = !mIStart.mStyle->IsClip();
|
|
mIEnd.Reset();
|
|
mIEnd.mHasBlockEllipsis = aLine->HasLineClampEllipsis();
|
|
mIEnd.mActive = !mIEnd.mStyle->IsClip() || aLine->HasLineClampEllipsis();
|
|
|
|
FrameHashtable framesToHide(64);
|
|
AlignmentEdges alignmentEdges;
|
|
const LogicalRect contentArea =
|
|
ExamineLineFrames(aLine, &framesToHide, &alignmentEdges);
|
|
bool needIStart = mIStart.IsNeeded();
|
|
bool needIEnd = mIEnd.IsNeeded();
|
|
if (!needIStart && !needIEnd) {
|
|
return;
|
|
}
|
|
NS_ASSERTION(!mIStart.IsSuppressed() || !needIStart,
|
|
"left marker when not needed");
|
|
NS_ASSERTION(!mIEnd.IsSuppressed() || !needIEnd,
|
|
"right marker when not needed");
|
|
|
|
// 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 > contentArea.ISize(mBlockWM)) {
|
|
needIStart = false;
|
|
}
|
|
LogicalRect insideMarkersArea = contentArea;
|
|
if (needIStart) {
|
|
InflateIStart(mBlockWM, &insideMarkersArea, -mIStart.mISize);
|
|
}
|
|
if (needIEnd) {
|
|
InflateIEnd(mBlockWM, &insideMarkersArea, -mIEnd.mISize);
|
|
}
|
|
|
|
if (alignmentEdges.mAssignedInner) {
|
|
if (mIStart.mEdgeAligned) {
|
|
alignmentEdges.mIStart = insideMarkersArea.IStart(mBlockWM);
|
|
}
|
|
if (mIEnd.mEdgeAligned) {
|
|
alignmentEdges.mIEnd = insideMarkersArea.IEnd(mBlockWM);
|
|
}
|
|
LogicalRect alignmentRect(mBlockWM, alignmentEdges.mIStart,
|
|
insideMarkersArea.BStart(mBlockWM),
|
|
alignmentEdges.ISize(), 1);
|
|
insideMarkersArea.IntersectRect(insideMarkersArea, alignmentRect);
|
|
} else {
|
|
// There was no content on the line that was visible at the current scolled
|
|
// position. If we wanted to place a block ellipsis but failed due to
|
|
// having no visible content to align it to, we still need to ensure it
|
|
// is displayed. It goes at the start of the line, even though it's an
|
|
// IEnd marker, since that is the side of the line that the content has
|
|
// been scrolled past. We set the insideMarkersArea to a zero-sized
|
|
// rectangle placed next to the scrolled-out-of-view content.
|
|
if (mIEnd.mHasBlockEllipsis) {
|
|
insideMarkersArea = LogicalRect(mBlockWM, alignmentEdges.mIEndOuter,
|
|
insideMarkersArea.BStart(mBlockWM), 0, 1);
|
|
}
|
|
}
|
|
|
|
// 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, contentArea,
|
|
aLineNumber);
|
|
}
|
|
|
|
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->Destroy(mBuilder);
|
|
continue;
|
|
}
|
|
|
|
nsDisplayList* wrapper = item->GetSameCoordinateSystemChildren();
|
|
if (wrapper) {
|
|
if (!itemFrame || GetSelfOrNearestBlock(itemFrame) == mBlock) {
|
|
PruneDisplayListContents(wrapper, aFramesToHide, aInsideMarkersArea);
|
|
}
|
|
}
|
|
|
|
nsDisplayText* textItem =
|
|
itemFrame ? nsDisplayText::CheckCast(item) : nullptr;
|
|
if (textItem && GetSelfOrNearestBlock(itemFrame) == mBlock) {
|
|
LogicalRect rect =
|
|
GetLogicalScrollableOverflowRectRelativeToBlock(itemFrame);
|
|
if (mIStart.IsNeeded()) {
|
|
nscoord istart =
|
|
aInsideMarkersArea.IStart(mBlockWM) - rect.IStart(mBlockWM);
|
|
if (istart > 0) {
|
|
(mBlockWM.IsBidiLTR() ? textItem->VisIStartEdge()
|
|
: textItem->VisIEndEdge()) = istart;
|
|
}
|
|
}
|
|
if (mIEnd.IsNeeded()) {
|
|
nscoord iend = rect.IEnd(mBlockWM) - aInsideMarkersArea.IEnd(mBlockWM);
|
|
if (iend > 0) {
|
|
(mBlockWM.IsBidiLTR() ? textItem->VisIEndEdge()
|
|
: textItem->VisIStartEdge()) = iend;
|
|
}
|
|
}
|
|
}
|
|
|
|
saved.AppendToTop(item);
|
|
}
|
|
aList->AppendToTop(&saved);
|
|
}
|
|
|
|
/* static */
|
|
bool TextOverflow::HasClippedTextOverflow(nsIFrame* aBlockFrame) {
|
|
const nsStyleTextReset* style = aBlockFrame->StyleTextReset();
|
|
return style->mTextOverflow.first.IsClip() &&
|
|
style->mTextOverflow.second.IsClip();
|
|
}
|
|
|
|
/* static */
|
|
bool TextOverflow::HasBlockEllipsis(nsIFrame* aBlockFrame) {
|
|
nsBlockFrame* f = do_QueryFrame(aBlockFrame);
|
|
return f && f->HasAnyStateBits(NS_BLOCK_HAS_LINE_CLAMP_ELLIPSIS);
|
|
}
|
|
|
|
/* static */
|
|
bool TextOverflow::CanHaveOverflowMarkers(nsIFrame* aBlockFrame) {
|
|
// Treat a line with a -webkit-line-clamp ellipsis as a kind of text
|
|
// overflow.
|
|
if (aBlockFrame->HasAnyStateBits(NS_BLOCK_HAS_LINE_CLAMP_ELLIPSIS)) {
|
|
return true;
|
|
}
|
|
|
|
// Nothing to do for text-overflow:clip or if 'overflow-x/y:visible'.
|
|
if (HasClippedTextOverflow(aBlockFrame) ||
|
|
IsInlineAxisOverflowVisible(aBlockFrame)) {
|
|
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->IsComboboxControlFrame()) {
|
|
return false;
|
|
}
|
|
|
|
// Inhibit the markers if a descendant content owns the caret.
|
|
RefPtr<nsCaret> caret = aBlockFrame->PresShell()->GetCaret();
|
|
if (caret && caret->IsVisible()) {
|
|
RefPtr<dom::Selection> domSelection = caret->GetSelection();
|
|
if (domSelection) {
|
|
nsCOMPtr<nsIContent> content =
|
|
nsIContent::FromNodeOrNull(domSelection->GetFocusNode());
|
|
if (content &&
|
|
content->IsInclusiveDescendantOf(aBlockFrame->GetContent())) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void TextOverflow::CreateMarkers(const nsLineBox* aLine, bool aCreateIStart,
|
|
bool aCreateIEnd,
|
|
const LogicalRect& aInsideMarkersArea,
|
|
const LogicalRect& aContentArea,
|
|
uint32_t aLineNumber) {
|
|
if (!mBlock->IsVisibleForPainting()) {
|
|
return;
|
|
}
|
|
|
|
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(aContentArea.GetPhysicalRect(mBlockWM, mBlockSize) + offset,
|
|
markerRect, clipState);
|
|
mMarkerList.AppendNewToTop<nsDisplayTextOverflowMarker>(
|
|
mBuilder, mBlock, markerRect, aLine->GetLogicalAscent(),
|
|
*mIStart.mStyle, aLineNumber, 0);
|
|
}
|
|
|
|
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(aContentArea.GetPhysicalRect(mBlockWM, mBlockSize) + offset,
|
|
markerRect, clipState);
|
|
mMarkerList.AppendNewToTop<nsDisplayTextOverflowMarker>(
|
|
mBuilder, mBlock, markerRect, aLine->GetLogicalAscent(),
|
|
mIEnd.mHasBlockEllipsis ? StyleTextOverflowSide::Ellipsis()
|
|
: *mIEnd.mStyle,
|
|
aLineNumber, 1);
|
|
}
|
|
}
|
|
|
|
void TextOverflow::Marker::SetupString(nsIFrame* aFrame) {
|
|
if (mInitialized) {
|
|
return;
|
|
}
|
|
|
|
// A limitation here is that at the IEnd of a line, we only ever render one of
|
|
// a text-overflow marker and a -webkit-line-clamp block ellipsis. Since we
|
|
// don't track the block ellipsis string and the text-overflow marker string
|
|
// separately, if both apply to the element, we will always use "…" as the
|
|
// string for text-overflow.
|
|
if (HasBlockEllipsis(aFrame) || mStyle->IsEllipsis()) {
|
|
gfxTextRun* textRun = GetEllipsisTextRun(aFrame);
|
|
if (textRun) {
|
|
mISize = textRun->GetAdvanceWidth();
|
|
} else {
|
|
mISize = 0;
|
|
}
|
|
} else {
|
|
RefPtr<gfxContext> rc =
|
|
aFrame->PresShell()->CreateReferenceRenderingContext();
|
|
RefPtr<nsFontMetrics> fm =
|
|
nsLayoutUtils::GetInflatedFontMetricsForFrame(aFrame);
|
|
mISize = nsLayoutUtils::AppUnitWidthOfStringBidi(
|
|
NS_ConvertUTF8toUTF16(mStyle->AsString().AsString()), aFrame, *fm, *rc);
|
|
}
|
|
mIntrinsicISize = mISize;
|
|
mInitialized = true;
|
|
}
|
|
|
|
} // namespace css
|
|
} // namespace mozilla
|