29d310bf8a
This patch does several things. Sorry. In BuildDisplayList implementations, instead of wrapping display items in nsDisplayClip, we push clip state onto the nsDisplayListBuilder and give the display items an explicit clip when they're created. In FrameLayerBuilder, we use the explicit clips we find on display items instead of computing our own. We remove nsDisplayClip and everything that depends on it. We remove ExplodeAnonymousChildLists. With nsDisplayClip gone, and nsDisplayOptionEventGrabber removed in a previous patch, there are no anonymous child lists. nsDisplayItem::TryMerge implementations need to make sure they have the same clip before being merged. I ripped out the part of PruneDisplayListForExtraPage that adjusts clip rects. As far as I can tell, it isn't actually necessary.
775 lines
27 KiB
C++
775 lines
27 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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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 "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 "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 "nsRenderingContext.h"
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#include "nsTextFrame.h"
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#include "nsStyleStructInlines.h"
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#include "mozilla/Util.h"
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#include "mozilla/Likely.h"
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namespace mozilla {
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namespace css {
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class LazyReferenceRenderingContextGetterFromFrame MOZ_FINAL :
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public gfxFontGroup::LazyReferenceContextGetter {
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public:
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LazyReferenceRenderingContextGetterFromFrame(nsIFrame* aFrame)
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: mFrame(aFrame) {}
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virtual already_AddRefed<gfxContext> GetRefContext() MOZ_OVERRIDE
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{
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nsRefPtr<nsRenderingContext> rc =
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mFrame->PresContext()->PresShell()->GetReferenceRenderingContext();
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nsRefPtr<gfxContext> ctx = rc->ThebesContext();
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return ctx.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*
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GetEllipsisTextRun(nsIFrame* aFrame)
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{
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nsRefPtr<nsFontMetrics> fm;
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nsLayoutUtils::GetFontMetricsForFrame(aFrame, getter_AddRefs(fm),
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nsLayoutUtils::FontSizeInflationFor(aFrame));
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LazyReferenceRenderingContextGetterFromFrame lazyRefContextGetter(aFrame);
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return fm->GetThebesFontGroup()->GetEllipsisTextRun(
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aFrame->PresContext()->AppUnitsPerDevPixel(), lazyRefContextGetter);
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}
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static nsIFrame*
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GetSelfOrNearestBlock(nsIFrame* aFrame)
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{
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return nsLayoutUtils::GetAsBlock(aFrame) ? 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
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IsAtomicElement(nsIFrame* aFrame, const nsIAtom* aFrameType)
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{
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NS_PRECONDITION(!nsLayoutUtils::GetAsBlock(aFrame) ||
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!aFrame->IsBlockOutside(),
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"unexpected block frame");
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NS_PRECONDITION(aFrameType != nsGkAtoms::placeholderFrame,
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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
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IsFullyClipped(nsTextFrame* aFrame, nscoord aLeft, nscoord aRight,
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nscoord* aSnappedLeft, nscoord* aSnappedRight)
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{
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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,
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aSnappedLeft, aSnappedRight);
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}
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static bool
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IsHorizontalOverflowVisible(nsIFrame* aFrame)
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{
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NS_PRECONDITION(nsLayoutUtils::GetAsBlock(aFrame) != nullptr,
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"expected a block frame");
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nsIFrame* f = aFrame;
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while (f && f->StyleContext()->GetPseudo() &&
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f->GetType() != nsGkAtoms::scrollFrame) {
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f = f->GetParent();
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}
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return !f || f->StyleDisplay()->mOverflowX == NS_STYLE_OVERFLOW_VISIBLE;
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}
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static void
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ClipMarker(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame,
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const nsRect& aContentArea,
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const nsRect& aMarkerRect,
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DisplayItemClip& aClipOnStack)
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{
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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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aBuilder->ClipState().ClipContentDescendants(markerRect, aClipOnStack);
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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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aBuilder->ClipState().ClipContentDescendants(markerRect, aClipOnStack);
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}
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}
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}
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static void
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InflateLeft(nsRect* aRect, nscoord aDelta)
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{
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nscoord xmost = aRect->XMost();
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aRect->x -= aDelta;
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aRect->width = std::max(xmost - aRect->x, 0);
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}
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static void
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InflateRight(nsRect* aRect, nscoord aDelta)
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{
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aRect->width = std::max(aRect->width + aDelta, 0);
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}
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static bool
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IsFrameDescendantOfAny(nsIFrame* aChild,
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const TextOverflow::FrameHashtable& aSetOfFrames,
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nsIFrame* aCommonAncestor)
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{
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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 : public nsDisplayItem
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{
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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 nsStyleTextOverflowSide* aStyle,
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uint32_t aIndex)
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: nsDisplayItem(aBuilder, aFrame), mRect(aRect),
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mStyle(aStyle), mAscent(aAscent), mIndex(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, bool* aSnap) {
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*aSnap = false;
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nsRect shadowRect =
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nsLayoutUtils::GetTextShadowRectsUnion(mRect, mFrame);
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return mRect.Union(shadowRect);
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}
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virtual void Paint(nsDisplayListBuilder* aBuilder,
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nsRenderingContext* aCtx);
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virtual uint32_t GetPerFrameKey() {
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return (mIndex << nsDisplayItem::TYPE_BITS) | nsDisplayItem::GetPerFrameKey();
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}
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void PaintTextToContext(nsRenderingContext* aCtx,
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nsPoint aOffsetFromRect);
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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 nsStyleTextOverflowSide* mStyle;
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nscoord mAscent; // baseline for the marker text in mRect
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uint32_t mIndex;
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};
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static void
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PaintTextShadowCallback(nsRenderingContext* aCtx,
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nsPoint aShadowOffset,
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const nscolor& aShadowColor,
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void* aData)
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{
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reinterpret_cast<nsDisplayTextOverflowMarker*>(aData)->
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PaintTextToContext(aCtx, aShadowOffset);
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}
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void
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nsDisplayTextOverflowMarker::Paint(nsDisplayListBuilder* aBuilder,
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nsRenderingContext* aCtx)
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{
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nscolor foregroundColor =
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nsLayoutUtils::GetColor(mFrame, eCSSProperty_color);
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// Paint the text-shadows for the overflow marker
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nsLayoutUtils::PaintTextShadow(mFrame, aCtx, mRect, mVisibleRect,
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foregroundColor, PaintTextShadowCallback,
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(void*)this);
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aCtx->SetColor(foregroundColor);
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PaintTextToContext(aCtx, nsPoint(0, 0));
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}
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void
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nsDisplayTextOverflowMarker::PaintTextToContext(nsRenderingContext* aCtx,
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nsPoint aOffsetFromRect)
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{
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gfxFloat y = nsLayoutUtils::GetSnappedBaselineY(mFrame, aCtx->ThebesContext(),
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mRect.y, mAscent);
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nsPoint baselinePt(mRect.x, NSToCoordFloor(y));
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nsPoint pt = baselinePt + aOffsetFromRect;
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if (mStyle->mType == NS_STYLE_TEXT_OVERFLOW_ELLIPSIS) {
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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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gfxPoint gfxPt(pt.x, pt.y);
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textRun->Draw(aCtx->ThebesContext(), gfxPt, gfxFont::GLYPH_FILL,
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0, textRun->GetLength(), nullptr, nullptr, nullptr);
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}
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} else {
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nsRefPtr<nsFontMetrics> fm;
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nsLayoutUtils::GetFontMetricsForFrame(mFrame, getter_AddRefs(fm),
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nsLayoutUtils::FontSizeInflationFor(mFrame));
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aCtx->SetFont(fm);
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nsLayoutUtils::DrawString(mFrame, aCtx, mStyle->mString.get(),
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mStyle->mString.Length(), pt);
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}
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}
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void
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TextOverflow::Init(nsDisplayListBuilder* aBuilder,
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nsIFrame* aBlockFrame)
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{
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mBuilder = aBuilder;
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mBlock = aBlockFrame;
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mContentArea = aBlockFrame->GetContentRectRelativeToSelf();
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mScrollableFrame = nsLayoutUtils::GetScrollableFrameFor(aBlockFrame);
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uint8_t direction = aBlockFrame->StyleVisibility()->mDirection;
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mBlockIsRTL = direction == NS_STYLE_DIRECTION_RTL;
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mAdjustForPixelSnapping = false;
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#ifdef MOZ_XUL
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if (!mScrollableFrame) {
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nsIAtom* pseudoType = aBlockFrame->StyleContext()->GetPseudo();
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if (pseudoType == nsCSSAnonBoxes::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 = mBlockIsRTL;
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}
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}
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#endif
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mCanHaveHorizontalScrollbar = false;
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if (mScrollableFrame) {
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mCanHaveHorizontalScrollbar =
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mScrollableFrame->GetScrollbarStyles().mHorizontal != NS_STYLE_OVERFLOW_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 = mCanHaveHorizontalScrollbar;
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}
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mContentArea.MoveBy(mScrollableFrame->GetScrollPosition());
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nsIFrame* scrollFrame = do_QueryFrame(mScrollableFrame);
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scrollFrame->AddStateBits(NS_SCROLLFRAME_INVALIDATE_CONTENTS_ON_SCROLL);
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}
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const nsStyleTextReset* style = aBlockFrame->StyleTextReset();
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mLeft.Init(style->mTextOverflow.GetLeft(direction));
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mRight.Init(style->mTextOverflow.GetRight(direction));
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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 */ TextOverflow*
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TextOverflow::WillProcessLines(nsDisplayListBuilder* aBuilder,
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nsIFrame* aBlockFrame)
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{
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if (!CanHaveTextOverflow(aBuilder, aBlockFrame)) {
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return nullptr;
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}
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nsAutoPtr<TextOverflow> textOverflow(new TextOverflow);
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textOverflow->Init(aBuilder, aBlockFrame);
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return textOverflow.forget();
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}
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void
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TextOverflow::ExamineFrameSubtree(nsIFrame* aFrame,
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const nsRect& aContentArea,
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const nsRect& 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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{
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const nsIAtom* frameType = aFrame->GetType();
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if (frameType == nsGkAtoms::brFrame ||
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frameType == nsGkAtoms::placeholderFrame) {
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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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nsRect childRect = aFrame->GetScrollableOverflowRect() +
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aFrame->GetOffsetTo(mBlock);
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bool overflowLeft = childRect.x < aContentArea.x;
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bool overflowRight = childRect.XMost() > aContentArea.XMost();
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if (overflowLeft) {
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mLeft.mHasOverflow = true;
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}
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if (overflowRight) {
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mRight.mHasOverflow = true;
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}
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if (isAtomic && ((mLeft.mActive && overflowLeft) ||
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(mRight.mActive && overflowRight))) {
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aFramesToHide->PutEntry(aFrame);
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} else if (isAtomic || frameType == nsGkAtoms::textFrame) {
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AnalyzeMarkerEdges(aFrame, frameType, aInsideMarkersArea,
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aFramesToHide, aAlignmentEdges,
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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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nsIFrame* child = aFrame->GetFirstPrincipalChild();
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while (child) {
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ExamineFrameSubtree(child, aContentArea, aInsideMarkersArea,
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aFramesToHide, aAlignmentEdges,
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aFoundVisibleTextOrAtomic,
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aClippedMarkerEdges);
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child = child->GetNextSibling();
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}
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}
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void
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TextOverflow::AnalyzeMarkerEdges(nsIFrame* aFrame,
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const nsIAtom* aFrameType,
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const nsRect& 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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{
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nsRect borderRect(aFrame->GetOffsetTo(mBlock), aFrame->GetSize());
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nscoord leftOverlap =
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std::max(aInsideMarkersArea.x - borderRect.x, 0);
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nscoord rightOverlap =
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std::max(borderRect.XMost() - aInsideMarkersArea.XMost(), 0);
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bool insideLeftEdge = aInsideMarkersArea.x <= borderRect.XMost();
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bool insideRightEdge = borderRect.x <= aInsideMarkersArea.XMost();
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if (leftOverlap > 0) {
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aClippedMarkerEdges->AccumulateLeft(borderRect);
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if (!mLeft.mActive) {
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leftOverlap = 0;
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}
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}
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if (rightOverlap > 0) {
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aClippedMarkerEdges->AccumulateRight(borderRect);
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if (!mRight.mActive) {
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rightOverlap = 0;
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}
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}
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if ((leftOverlap > 0 && insideLeftEdge) ||
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(rightOverlap > 0 && insideRightEdge)) {
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if (aFrameType == nsGkAtoms::textFrame) {
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if (aInsideMarkersArea.x < aInsideMarkersArea.XMost()) {
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// a clipped text frame and there is some room between the markers
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nscoord snappedLeft, snappedRight;
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bool isFullyClipped =
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IsFullyClipped(static_cast<nsTextFrame*>(aFrame),
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leftOverlap, rightOverlap, &snappedLeft, &snappedRight);
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if (!isFullyClipped) {
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nsRect snappedRect = borderRect;
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if (leftOverlap > 0) {
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snappedRect.x += snappedLeft;
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snappedRect.width -= snappedLeft;
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}
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if (rightOverlap > 0) {
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snappedRect.width -= snappedRight;
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}
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aAlignmentEdges->Accumulate(snappedRect);
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*aFoundVisibleTextOrAtomic = true;
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}
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}
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} else {
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aFramesToHide->PutEntry(aFrame);
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}
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} else if (!insideLeftEdge || !insideRightEdge) {
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// frame is outside
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if (IsAtomicElement(aFrame, aFrameType)) {
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aFramesToHide->PutEntry(aFrame);
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}
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} else {
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// frame is inside
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aAlignmentEdges->Accumulate(borderRect);
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*aFoundVisibleTextOrAtomic = true;
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}
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}
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void
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TextOverflow::ExamineLineFrames(nsLineBox* aLine,
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FrameHashtable* aFramesToHide,
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AlignmentEdges* aAlignmentEdges)
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{
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// No ellipsing for 'clip' style.
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bool suppressLeft = mLeft.mStyle->mType == NS_STYLE_TEXT_OVERFLOW_CLIP;
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bool suppressRight = mRight.mStyle->mType == NS_STYLE_TEXT_OVERFLOW_CLIP;
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if (mCanHaveHorizontalScrollbar) {
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nsPoint pos = mScrollableFrame->GetScrollPosition();
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nsRect scrollRange = mScrollableFrame->GetScrollRange();
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// No ellipsing when nothing to scroll to on that side (this includes
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// overflow:auto that doesn't trigger a horizontal scrollbar).
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if (pos.x <= scrollRange.x) {
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suppressLeft = true;
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}
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if (pos.x >= scrollRange.XMost()) {
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suppressRight = true;
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}
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}
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nsRect contentArea = mContentArea;
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const nscoord scrollAdjust = mAdjustForPixelSnapping ?
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mBlock->PresContext()->AppUnitsPerDevPixel() : 0;
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InflateLeft(&contentArea, scrollAdjust);
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InflateRight(&contentArea, scrollAdjust);
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nsRect lineRect = aLine->GetScrollableOverflowArea();
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const bool leftOverflow =
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!suppressLeft && lineRect.x < contentArea.x;
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const bool rightOverflow =
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!suppressRight && lineRect.XMost() > contentArea.XMost();
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if (!leftOverflow && !rightOverflow) {
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// The line does not overflow on a side we should ellipsize.
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return;
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}
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int pass = 0;
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bool retryEmptyLine = true;
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bool guessLeft = leftOverflow;
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bool guessRight = rightOverflow;
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mLeft.mActive = leftOverflow;
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mRight.mActive = rightOverflow;
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bool clippedLeftMarker = false;
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bool clippedRightMarker = false;
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do {
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// Setup marker strings as needed.
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if (guessLeft) {
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mLeft.SetupString(mBlock);
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}
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if (guessRight) {
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mRight.SetupString(mBlock);
|
|
}
|
|
|
|
// If there is insufficient space for both markers then keep the one on the
|
|
// end side per the block's 'direction'.
|
|
nscoord rightMarkerWidth = mRight.mActive ? mRight.mWidth : 0;
|
|
nscoord leftMarkerWidth = mLeft.mActive ? mLeft.mWidth : 0;
|
|
if (leftMarkerWidth && rightMarkerWidth &&
|
|
leftMarkerWidth + rightMarkerWidth > contentArea.width) {
|
|
if (mBlockIsRTL) {
|
|
rightMarkerWidth = 0;
|
|
} else {
|
|
leftMarkerWidth = 0;
|
|
}
|
|
}
|
|
|
|
// Calculate the area between the potential markers aligned at the
|
|
// block's edge.
|
|
nsRect insideMarkersArea = mContentArea;
|
|
if (guessLeft) {
|
|
InflateLeft(&insideMarkersArea, -leftMarkerWidth);
|
|
}
|
|
if (guessRight) {
|
|
InflateRight(&insideMarkersArea, -rightMarkerWidth);
|
|
}
|
|
|
|
// 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 (mLeft.IsNeeded() && mLeft.mActive && !clippedLeftMarker) {
|
|
if (clippedMarkerEdges.mAssignedLeft &&
|
|
clippedMarkerEdges.mLeft - mContentArea.X() > 0) {
|
|
mLeft.mWidth = clippedMarkerEdges.mLeft - mContentArea.X();
|
|
NS_ASSERTION(mLeft.mWidth < mLeft.mIntrinsicWidth,
|
|
"clipping a marker should make it strictly smaller");
|
|
clippedLeftMarker = true;
|
|
} else {
|
|
mLeft.mActive = guessLeft = false;
|
|
}
|
|
continue;
|
|
}
|
|
if (mRight.IsNeeded() && mRight.mActive && !clippedRightMarker) {
|
|
if (clippedMarkerEdges.mAssignedRight &&
|
|
mContentArea.XMost() - clippedMarkerEdges.mRight > 0) {
|
|
mRight.mWidth = mContentArea.XMost() - clippedMarkerEdges.mRight;
|
|
NS_ASSERTION(mRight.mWidth < mRight.mIntrinsicWidth,
|
|
"clipping a marker should make it strictly smaller");
|
|
clippedRightMarker = true;
|
|
} else {
|
|
mRight.mActive = guessRight = false;
|
|
}
|
|
continue;
|
|
}
|
|
// The line simply has no visible content even without markers,
|
|
// so examine the line again without suppressing markers.
|
|
retryEmptyLine = false;
|
|
mLeft.mWidth = mLeft.mIntrinsicWidth;
|
|
mLeft.mActive = guessLeft = leftOverflow;
|
|
mRight.mWidth = mRight.mIntrinsicWidth;
|
|
mRight.mActive = guessRight = rightOverflow;
|
|
continue;
|
|
}
|
|
if (guessLeft == (mLeft.mActive && mLeft.IsNeeded()) &&
|
|
guessRight == (mRight.mActive && mRight.IsNeeded())) {
|
|
break;
|
|
} else {
|
|
guessLeft = mLeft.mActive && mLeft.IsNeeded();
|
|
guessRight = mRight.mActive && mRight.IsNeeded();
|
|
mLeft.Reset();
|
|
mRight.Reset();
|
|
aFramesToHide->Clear();
|
|
}
|
|
NS_ASSERTION(pass == 0, "2nd pass should never guess wrong");
|
|
} while (++pass != 2);
|
|
if (!leftOverflow || !mLeft.mActive) {
|
|
mLeft.Reset();
|
|
}
|
|
if (!rightOverflow || !mRight.mActive) {
|
|
mRight.Reset();
|
|
}
|
|
}
|
|
|
|
void
|
|
TextOverflow::ProcessLine(const nsDisplayListSet& aLists,
|
|
nsLineBox* aLine)
|
|
{
|
|
NS_ASSERTION(mLeft.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP ||
|
|
mRight.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP,
|
|
"TextOverflow with 'clip' for both sides");
|
|
mLeft.Reset();
|
|
mLeft.mActive = mLeft.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP;
|
|
mRight.Reset();
|
|
mRight.mActive = mRight.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP;
|
|
|
|
FrameHashtable framesToHide;
|
|
framesToHide.Init(100);
|
|
AlignmentEdges alignmentEdges;
|
|
ExamineLineFrames(aLine, &framesToHide, &alignmentEdges);
|
|
bool needLeft = mLeft.IsNeeded();
|
|
bool needRight = mRight.IsNeeded();
|
|
if (!needLeft && !needRight) {
|
|
return;
|
|
}
|
|
NS_ASSERTION(mLeft.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP ||
|
|
!needLeft, "left marker for 'clip'");
|
|
NS_ASSERTION(mRight.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP ||
|
|
!needRight, "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 (needLeft && needRight &&
|
|
mLeft.mWidth + mRight.mWidth > mContentArea.width) {
|
|
if (mBlockIsRTL) {
|
|
needRight = false;
|
|
} else {
|
|
needLeft = false;
|
|
}
|
|
}
|
|
nsRect insideMarkersArea = mContentArea;
|
|
if (needLeft) {
|
|
InflateLeft(&insideMarkersArea, -mLeft.mWidth);
|
|
}
|
|
if (needRight) {
|
|
InflateRight(&insideMarkersArea, -mRight.mWidth);
|
|
}
|
|
if (!mCanHaveHorizontalScrollbar && alignmentEdges.mAssigned) {
|
|
nsRect alignmentRect = nsRect(alignmentEdges.x, insideMarkersArea.y,
|
|
alignmentEdges.Width(), 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, needLeft, needRight, insideMarkersArea);
|
|
}
|
|
|
|
void
|
|
TextOverflow::PruneDisplayListContents(nsDisplayList* aList,
|
|
const FrameHashtable& aFramesToHide,
|
|
const nsRect& aInsideMarkersArea)
|
|
{
|
|
nsDisplayList saved;
|
|
nsDisplayItem* item;
|
|
while ((item = aList->RemoveBottom())) {
|
|
nsIFrame* itemFrame = item->GetUnderlyingFrame();
|
|
if (itemFrame && 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) {
|
|
nsRect rect = itemFrame->GetScrollableOverflowRect() +
|
|
itemFrame->GetOffsetTo(mBlock);
|
|
if (mLeft.IsNeeded() && rect.x < aInsideMarkersArea.x) {
|
|
nscoord left = aInsideMarkersArea.x - rect.x;
|
|
if (MOZ_UNLIKELY(left < 0)) {
|
|
item->~nsDisplayItem();
|
|
continue;
|
|
}
|
|
charClip->mLeftEdge = left;
|
|
}
|
|
if (mRight.IsNeeded() && rect.XMost() > aInsideMarkersArea.XMost()) {
|
|
nscoord right = rect.XMost() - aInsideMarkersArea.XMost();
|
|
if (MOZ_UNLIKELY(right < 0)) {
|
|
item->~nsDisplayItem();
|
|
continue;
|
|
}
|
|
charClip->mRightEdge = right;
|
|
}
|
|
}
|
|
|
|
saved.AppendToTop(item);
|
|
}
|
|
aList->AppendToTop(&saved);
|
|
}
|
|
|
|
/* static */ bool
|
|
TextOverflow::CanHaveTextOverflow(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aBlockFrame)
|
|
{
|
|
const nsStyleTextReset* style = aBlockFrame->StyleTextReset();
|
|
// Nothing to do for text-overflow:clip or if 'overflow-x:visible'
|
|
// or if we're just building items for event processing.
|
|
if ((style->mTextOverflow.mLeft.mType == NS_STYLE_TEXT_OVERFLOW_CLIP &&
|
|
style->mTextOverflow.mRight.mType == NS_STYLE_TEXT_OVERFLOW_CLIP) ||
|
|
IsHorizontalOverflowVisible(aBlockFrame) ||
|
|
aBuilder->IsForEventDelivery()) {
|
|
return false;
|
|
}
|
|
|
|
// Inhibit the markers if a descendant content owns the caret.
|
|
nsRefPtr<nsCaret> caret = aBlockFrame->PresContext()->PresShell()->GetCaret();
|
|
bool visible = false;
|
|
if (caret && NS_SUCCEEDED(caret->GetCaretVisible(&visible)) && visible) {
|
|
nsCOMPtr<nsISelection> domSelection = caret->GetCaretDOMSelection();
|
|
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 aCreateLeft,
|
|
bool aCreateRight,
|
|
const nsRect& aInsideMarkersArea)
|
|
{
|
|
if (aCreateLeft) {
|
|
DisplayListClipState::AutoSaveRestore saveClip(mBuilder->ClipState());
|
|
|
|
nsRect markerRect = nsRect(aInsideMarkersArea.x - mLeft.mIntrinsicWidth,
|
|
aLine->mBounds.y,
|
|
mLeft.mIntrinsicWidth, aLine->mBounds.height);
|
|
markerRect += mBuilder->ToReferenceFrame(mBlock);
|
|
DisplayItemClip clipOnStack;
|
|
ClipMarker(mBuilder, mBlock,
|
|
mContentArea + mBuilder->ToReferenceFrame(mBlock),
|
|
markerRect, clipOnStack);
|
|
nsDisplayItem* marker = new (mBuilder)
|
|
nsDisplayTextOverflowMarker(mBuilder, mBlock, markerRect,
|
|
aLine->GetAscent(), mLeft.mStyle, 0);
|
|
mMarkerList.AppendNewToTop(marker);
|
|
}
|
|
|
|
if (aCreateRight) {
|
|
DisplayListClipState::AutoSaveRestore saveClip(mBuilder->ClipState());
|
|
|
|
nsRect markerRect = nsRect(aInsideMarkersArea.XMost(),
|
|
aLine->mBounds.y,
|
|
mRight.mIntrinsicWidth, aLine->mBounds.height);
|
|
markerRect += mBuilder->ToReferenceFrame(mBlock);
|
|
DisplayItemClip clipOnStack;
|
|
ClipMarker(mBuilder, mBlock,
|
|
mContentArea + mBuilder->ToReferenceFrame(mBlock),
|
|
markerRect, clipOnStack);
|
|
nsDisplayItem* marker = new (mBuilder)
|
|
nsDisplayTextOverflowMarker(mBuilder, mBlock, markerRect,
|
|
aLine->GetAscent(), mRight.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) {
|
|
mWidth = textRun->GetAdvanceWidth(0, textRun->GetLength(), nullptr);
|
|
} else {
|
|
mWidth = 0;
|
|
}
|
|
} else {
|
|
nsRefPtr<nsRenderingContext> rc =
|
|
aFrame->PresContext()->PresShell()->GetReferenceRenderingContext();
|
|
nsRefPtr<nsFontMetrics> fm;
|
|
nsLayoutUtils::GetFontMetricsForFrame(aFrame, getter_AddRefs(fm),
|
|
nsLayoutUtils::FontSizeInflationFor(aFrame));
|
|
rc->SetFont(fm);
|
|
mWidth = nsLayoutUtils::GetStringWidth(aFrame, rc, mStyle->mString.get(),
|
|
mStyle->mString.Length());
|
|
}
|
|
mIntrinsicWidth = mWidth;
|
|
mInitialized = true;
|
|
}
|
|
|
|
} // namespace css
|
|
} // namespace mozilla
|