840 lines
33 KiB
C++
840 lines
33 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#ifndef nsTextFrame_h__
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#define nsTextFrame_h__
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#include "mozilla/Attributes.h"
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#include "mozilla/EventForwards.h"
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#include "mozilla/gfx/2D.h"
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#include "nsFrame.h"
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#include "nsSplittableFrame.h"
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#include "nsLineBox.h"
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#include "gfxSkipChars.h"
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#include "gfxTextRun.h"
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#include "nsDisplayList.h"
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#include "JustificationUtils.h"
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#include "RubyUtils.h"
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// Undo the windows.h damage
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#if defined(XP_WIN) && defined(DrawText)
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#undef DrawText
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#endif
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class nsTextPaintStyle;
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class PropertyProvider;
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struct SelectionDetails;
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class nsTextFragment;
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class nsDisplayTextGeometry;
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class nsDisplayText;
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namespace mozilla {
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class SVGContextPaint;
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};
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class nsTextFrame : public nsFrame {
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typedef mozilla::LayoutDeviceRect LayoutDeviceRect;
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typedef mozilla::RawSelectionType RawSelectionType;
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typedef mozilla::SelectionType SelectionType;
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typedef mozilla::TextRangeStyle TextRangeStyle;
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typedef mozilla::gfx::DrawTarget DrawTarget;
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typedef mozilla::gfx::Point Point;
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typedef mozilla::gfx::Rect Rect;
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typedef mozilla::gfx::Size Size;
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typedef gfxTextRun::Range Range;
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public:
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NS_DECL_QUERYFRAME_TARGET(nsTextFrame)
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NS_DECL_FRAMEARENA_HELPERS
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friend class nsContinuingTextFrame;
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friend class nsDisplayTextGeometry;
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friend class nsDisplayText;
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explicit nsTextFrame(nsStyleContext* aContext)
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: nsFrame(aContext)
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{
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NS_ASSERTION(mContentOffset == 0, "Bogus content offset");
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}
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// nsQueryFrame
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NS_DECL_QUERYFRAME
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// nsIFrame
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virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists) override;
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virtual void Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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virtual void DestroyFrom(nsIFrame* aDestructRoot) override;
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virtual nsresult GetCursor(const nsPoint& aPoint,
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nsIFrame::Cursor& aCursor) override;
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virtual nsresult CharacterDataChanged(CharacterDataChangeInfo* aInfo) override;
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virtual nsIFrame* GetNextContinuation() const override {
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return mNextContinuation;
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}
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virtual void SetNextContinuation(nsIFrame* aNextContinuation) override {
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NS_ASSERTION (!aNextContinuation || GetType() == aNextContinuation->GetType(),
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"setting a next continuation with incorrect type!");
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NS_ASSERTION (!nsSplittableFrame::IsInNextContinuationChain(aNextContinuation, this),
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"creating a loop in continuation chain!");
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mNextContinuation = aNextContinuation;
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if (aNextContinuation)
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aNextContinuation->RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
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// Setting a non-fluid continuation might affect our flow length (they're
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// quite rare so we assume it always does) so we delete our cached value:
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GetContent()->DeleteProperty(nsGkAtoms::flowlength);
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}
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virtual nsIFrame* GetNextInFlowVirtual() const override { return GetNextInFlow(); }
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nsIFrame* GetNextInFlow() const {
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return mNextContinuation && (mNextContinuation->GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ?
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mNextContinuation : nullptr;
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}
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virtual void SetNextInFlow(nsIFrame* aNextInFlow) override {
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NS_ASSERTION (!aNextInFlow || GetType() == aNextInFlow->GetType(),
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"setting a next in flow with incorrect type!");
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NS_ASSERTION (!nsSplittableFrame::IsInNextContinuationChain(aNextInFlow, this),
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"creating a loop in continuation chain!");
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mNextContinuation = aNextInFlow;
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if (mNextContinuation &&
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!mNextContinuation->HasAnyStateBits(NS_FRAME_IS_FLUID_CONTINUATION)) {
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// Changing from non-fluid to fluid continuation might affect our flow
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// length, so we delete our cached value:
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GetContent()->DeleteProperty(nsGkAtoms::flowlength);
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}
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if (aNextInFlow) {
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aNextInFlow->AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
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}
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}
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virtual nsIFrame* LastInFlow() const override;
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virtual nsIFrame* LastContinuation() const override;
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virtual nsSplittableType GetSplittableType() const override {
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return NS_FRAME_SPLITTABLE;
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}
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/**
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* Get the "type" of the frame
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*
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* @see nsGkAtoms::textFrame
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*/
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virtual nsIAtom* GetType() const override;
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virtual bool IsFrameOfType(uint32_t aFlags) const override
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{
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// Set the frame state bit for text frames to mark them as replaced.
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// XXX kipp: temporary
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return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced |
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nsIFrame::eLineParticipant));
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}
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bool ShouldSuppressLineBreak() const
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{
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// If the parent frame of the text frame is ruby content box, it must
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// suppress line break inside. This check is necessary, because when
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// a whitespace is only contained by pseudo ruby frames, its style
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// context won't have SuppressLineBreak bit set.
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if (mozilla::RubyUtils::IsRubyContentBox(GetParent()->GetType())) {
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return true;
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}
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return StyleContext()->ShouldSuppressLineBreak();
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}
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virtual void InvalidateFrame(uint32_t aDisplayItemKey = 0) override;
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virtual void InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey = 0) override;
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#ifdef DEBUG_FRAME_DUMP
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void List(FILE* out = stderr, const char* aPrefix = "", uint32_t aFlags = 0) const override;
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virtual nsresult GetFrameName(nsAString& aResult) const override;
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void ToCString(nsCString& aBuf, int32_t* aTotalContentLength) const;
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#endif
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#ifdef DEBUG
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virtual nsFrameState GetDebugStateBits() const override;
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#endif
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virtual ContentOffsets CalcContentOffsetsFromFramePoint(nsPoint aPoint) override;
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ContentOffsets GetCharacterOffsetAtFramePoint(const nsPoint &aPoint);
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/**
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* This is called only on the primary text frame. It indicates that
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* the selection state of the given character range has changed.
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* Text in the range is unconditionally invalidated
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* (Selection::Repaint depends on this).
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* @param aSelected true if the selection has been added to the range,
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* false otherwise
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* @param aType the type of selection added or removed
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*/
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void SetSelectedRange(uint32_t aStart, uint32_t aEnd, bool aSelected,
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SelectionType aSelectionType);
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virtual FrameSearchResult PeekOffsetNoAmount(bool aForward, int32_t* aOffset) override;
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virtual FrameSearchResult PeekOffsetCharacter(bool aForward, int32_t* aOffset,
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bool aRespectClusters = true) override;
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virtual FrameSearchResult PeekOffsetWord(bool aForward, bool aWordSelectEatSpace, bool aIsKeyboardSelect,
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int32_t* aOffset, PeekWordState* aState) override;
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virtual nsresult CheckVisibility(nsPresContext* aContext, int32_t aStartIndex, int32_t aEndIndex, bool aRecurse, bool *aFinished, bool *_retval) override;
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// Flags for aSetLengthFlags
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enum { ALLOW_FRAME_CREATION_AND_DESTRUCTION = 0x01 };
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// Update offsets to account for new length. This may clear mTextRun.
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void SetLength(int32_t aLength, nsLineLayout* aLineLayout,
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uint32_t aSetLengthFlags = 0);
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virtual nsresult GetOffsets(int32_t &start, int32_t &end)const override;
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virtual void AdjustOffsetsForBidi(int32_t start, int32_t end) override;
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virtual nsresult GetPointFromOffset(int32_t inOffset,
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nsPoint* outPoint) override;
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virtual nsresult GetCharacterRectsInRange(int32_t aInOffset,
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int32_t aLength,
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nsTArray<nsRect>& aRects) override;
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virtual nsresult GetChildFrameContainingOffset(int32_t inContentOffset,
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bool inHint,
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int32_t* outFrameContentOffset,
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nsIFrame** outChildFrame) override;
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virtual bool IsVisibleInSelection(nsISelection* aSelection) override;
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virtual bool IsEmpty() override;
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virtual bool IsSelfEmpty() override { return IsEmpty(); }
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nscoord GetLogicalBaseline(mozilla::WritingMode aWritingMode) const final;
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virtual bool HasSignificantTerminalNewline() const override;
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/**
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* Returns true if this text frame is logically adjacent to the end of the
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* line.
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*/
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bool IsAtEndOfLine() const;
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/**
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* Call this only after reflow the frame. Returns true if non-collapsed
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* characters are present.
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*/
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bool HasNoncollapsedCharacters() const {
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return (GetStateBits() & TEXT_HAS_NONCOLLAPSED_CHARACTERS) != 0;
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}
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#ifdef ACCESSIBILITY
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virtual mozilla::a11y::AccType AccessibleType() override;
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#endif
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float GetFontSizeInflation() const;
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bool IsCurrentFontInflation(float aInflation) const;
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bool HasFontSizeInflation() const {
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return (GetStateBits() & TEXT_HAS_FONT_INFLATION) != 0;
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}
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void SetFontSizeInflation(float aInflation);
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virtual void MarkIntrinsicISizesDirty() override;
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virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override;
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virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;
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virtual void AddInlineMinISize(nsRenderingContext *aRenderingContext,
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InlineMinISizeData *aData) override;
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virtual void AddInlinePrefISize(nsRenderingContext *aRenderingContext,
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InlinePrefISizeData *aData) override;
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virtual mozilla::LogicalSize
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ComputeSize(nsRenderingContext *aRenderingContext,
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mozilla::WritingMode aWritingMode,
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const mozilla::LogicalSize& aCBSize,
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nscoord aAvailableISize,
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const mozilla::LogicalSize& aMargin,
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const mozilla::LogicalSize& aBorder,
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const mozilla::LogicalSize& aPadding,
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ComputeSizeFlags aFlags) override;
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virtual nsRect ComputeTightBounds(DrawTarget* aDrawTarget) const override;
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virtual nsresult GetPrefWidthTightBounds(nsRenderingContext* aContext,
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nscoord* aX,
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nscoord* aXMost) override;
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virtual void Reflow(nsPresContext* aPresContext,
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ReflowOutput& aMetrics,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) override;
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virtual bool CanContinueTextRun() const override;
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// Method that is called for a text frame that is logically
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// adjacent to the end of the line (i.e. followed only by empty text frames,
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// placeholders or inlines containing such).
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struct TrimOutput {
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// true if we trimmed some space or changed metrics in some other way.
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// In this case, we should call RecomputeOverflow on this frame.
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bool mChanged;
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// an amount to *subtract* from the frame's width (zero if !mChanged)
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nscoord mDeltaWidth;
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};
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TrimOutput TrimTrailingWhiteSpace(DrawTarget* aDrawTarget);
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virtual RenderedText GetRenderedText(uint32_t aStartOffset = 0,
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uint32_t aEndOffset = UINT32_MAX,
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TextOffsetType aOffsetType =
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TextOffsetType::OFFSETS_IN_CONTENT_TEXT,
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TrailingWhitespace aTrimTrailingWhitespace =
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TrailingWhitespace::TRIM_TRAILING_WHITESPACE) override;
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nsOverflowAreas RecomputeOverflow(nsIFrame* aBlockFrame);
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enum TextRunType {
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// Anything in reflow (but not intrinsic width calculation) or
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// painting should use the inflated text run (i.e., with font size
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// inflation applied).
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eInflated,
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// Intrinsic width calculation should use the non-inflated text run.
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// When there is font size inflation, it will be different.
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eNotInflated
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};
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void AddInlineMinISizeForFlow(nsRenderingContext *aRenderingContext,
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nsIFrame::InlineMinISizeData *aData,
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TextRunType aTextRunType);
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void AddInlinePrefISizeForFlow(nsRenderingContext *aRenderingContext,
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InlinePrefISizeData *aData,
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TextRunType aTextRunType);
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/**
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* Calculate the horizontal bounds of the grapheme clusters that fit entirely
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* inside the given left[top]/right[bottom] edges (which are positive lengths
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* from the respective frame edge). If an input value is zero it is ignored
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* and the result for that edge is zero. All out parameter values are
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* undefined when the method returns false.
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* @return true if at least one whole grapheme cluster fit between the edges
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*/
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bool MeasureCharClippedText(nscoord aVisIStartEdge, nscoord aVisIEndEdge,
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nscoord* aSnappedStartEdge,
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nscoord* aSnappedEndEdge);
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/**
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* Same as above; this method also the returns the corresponding text run
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* offset and number of characters that fit. All out parameter values are
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* undefined when the method returns false.
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* @return true if at least one whole grapheme cluster fit between the edges
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*/
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bool MeasureCharClippedText(PropertyProvider& aProvider,
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nscoord aVisIStartEdge, nscoord aVisIEndEdge,
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uint32_t* aStartOffset, uint32_t* aMaxLength,
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nscoord* aSnappedStartEdge,
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nscoord* aSnappedEndEdge);
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/**
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* Object with various callbacks for PaintText() to invoke for different parts
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* of the frame's text rendering, when we're generating paths rather than
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* painting.
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*
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* Callbacks are invoked in the following order:
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*
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* NotifySelectionBackgroundNeedsFill?
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* PaintDecorationLine*
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* NotifyBeforeText
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* NotifyGlyphPathEmitted*
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* NotifyAfterText
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* PaintDecorationLine*
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* PaintSelectionDecorationLine*
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*
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* The color of each part of the frame's text rendering is passed as an argument
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* to the NotifyBefore* callback for that part. The nscolor can take on one of
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* the three selection special colors defined in LookAndFeel.h --
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* NS_TRANSPARENT, NS_SAME_AS_FOREGROUND_COLOR and
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* NS_40PERCENT_FOREGROUND_COLOR.
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*/
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struct DrawPathCallbacks : gfxTextRunDrawCallbacks
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{
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/**
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* @param aShouldPaintSVGGlyphs Whether SVG glyphs should be painted.
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*/
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explicit DrawPathCallbacks(bool aShouldPaintSVGGlyphs = false)
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: gfxTextRunDrawCallbacks(aShouldPaintSVGGlyphs)
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{
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}
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/**
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* Called to have the selection highlight drawn before the text is drawn
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* over the top.
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*/
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virtual void NotifySelectionBackgroundNeedsFill(const Rect& aBackgroundRect,
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nscolor aColor,
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DrawTarget& aDrawTarget) { }
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/**
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* Called before (for under/over-line) or after (for line-through) the text
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* is drawn to have a text decoration line drawn.
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*/
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virtual void PaintDecorationLine(Rect aPath, nscolor aColor) { }
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/**
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* Called after selected text is drawn to have a decoration line drawn over
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* the text. (All types of text decoration are drawn after the text when
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* text is selected.)
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*/
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virtual void PaintSelectionDecorationLine(Rect aPath, nscolor aColor) { }
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/**
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* Called just before any paths have been emitted to the gfxContext
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* for the glyphs of the frame's text.
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*/
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virtual void NotifyBeforeText(nscolor aColor) { }
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/**
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* Called just after all the paths have been emitted to the gfxContext
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* for the glyphs of the frame's text.
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*/
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virtual void NotifyAfterText() { }
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/**
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* Called just before a path corresponding to a selection decoration line
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* has been emitted to the gfxContext.
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*/
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virtual void NotifyBeforeSelectionDecorationLine(nscolor aColor) { }
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/**
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* Called just after a path corresponding to a selection decoration line
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* has been emitted to the gfxContext.
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*/
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virtual void NotifySelectionDecorationLinePathEmitted() { }
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};
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struct PaintTextParams
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{
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gfxContext* context;
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gfxPoint framePt;
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LayoutDeviceRect dirtyRect;
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mozilla::SVGContextPaint* contextPaint = nullptr;
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DrawPathCallbacks* callbacks = nullptr;
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enum {
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PaintText, // Normal text painting.
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PaintTextBGColor, // Only paint background color of the selected text
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// range in this state.
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GenerateTextMask // To generate a mask from a text frame. Should
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// only paint text itself with opaque color.
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// Text shadow, text selection color and text
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// decoration are all discarded in this state.
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};
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uint8_t state = PaintText;
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explicit PaintTextParams(gfxContext* aContext) : context(aContext) {}
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bool IsPaintText() const { return state == PaintText; }
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bool IsGenerateTextMask() const { return state == GenerateTextMask; }
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bool IsPaintBGColor() const { return state == PaintTextBGColor; }
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};
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struct PaintTextSelectionParams : PaintTextParams
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{
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gfxPoint textBaselinePt;
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PropertyProvider* provider = nullptr;
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Range contentRange;
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nsTextPaintStyle* textPaintStyle = nullptr;
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explicit PaintTextSelectionParams(const PaintTextParams& aParams)
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: PaintTextParams(aParams) {}
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};
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struct DrawTextRunParams
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{
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gfxContext* context;
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PropertyProvider* provider = nullptr;
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gfxFloat* advanceWidth = nullptr;
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mozilla::SVGContextPaint* contextPaint = nullptr;
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DrawPathCallbacks* callbacks = nullptr;
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nscolor textColor = NS_RGBA(0, 0, 0, 0);
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nscolor textStrokeColor = NS_RGBA(0, 0, 0, 0);
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float textStrokeWidth = 0.0f;
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bool drawSoftHyphen = false;
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explicit DrawTextRunParams(gfxContext* aContext)
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: context(aContext) {}
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};
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struct DrawTextParams : DrawTextRunParams
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{
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gfxPoint framePt;
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LayoutDeviceRect dirtyRect;
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const nsTextPaintStyle* textStyle = nullptr;
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const nsCharClipDisplayItem::ClipEdges* clipEdges = nullptr;
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const nscolor* decorationOverrideColor = nullptr;
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explicit DrawTextParams(gfxContext* aContext)
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: DrawTextRunParams(aContext) {}
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};
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// Primary frame paint method called from nsDisplayText. Can also be used
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// to generate paths rather than paint the frame's text by passing a callback
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// object. The private DrawText() is what applies the text to a graphics
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// context.
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void PaintText(const PaintTextParams& aParams,
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const nsCharClipDisplayItem& aItem,
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float aOpacity = 1.0f);
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// helper: paint text frame when we're impacted by at least one selection.
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// Return false if the text was not painted and we should continue with
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// the fast path.
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bool PaintTextWithSelection(const PaintTextSelectionParams& aParams,
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const nsCharClipDisplayItem::ClipEdges& aClipEdges);
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// helper: paint text with foreground and background colors determined
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// by selection(s). Also computes a mask of all selection types applying to
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// our text, returned in aAllTypes.
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// Return false if the text was not painted and we should continue with
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// the fast path.
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bool PaintTextWithSelectionColors(
|
|
const PaintTextSelectionParams& aParams,
|
|
SelectionDetails* aDetails,
|
|
RawSelectionType* aAllRawSelectionTypes,
|
|
const nsCharClipDisplayItem::ClipEdges& aClipEdges);
|
|
// helper: paint text decorations for text selected by aSelectionType
|
|
void PaintTextSelectionDecorations(const PaintTextSelectionParams& aParams,
|
|
SelectionDetails* aDetails,
|
|
SelectionType aSelectionType);
|
|
|
|
void DrawEmphasisMarks(gfxContext* aContext,
|
|
mozilla::WritingMode aWM,
|
|
const gfxPoint& aTextBaselinePt,
|
|
const gfxPoint& aFramePt, Range aRange,
|
|
const nscolor* aDecorationOverrideColor,
|
|
PropertyProvider* aProvider);
|
|
|
|
virtual nscolor GetCaretColorAt(int32_t aOffset) override;
|
|
|
|
int16_t GetSelectionStatus(int16_t* aSelectionFlags);
|
|
|
|
int32_t GetContentOffset() const { return mContentOffset; }
|
|
int32_t GetContentLength() const
|
|
{
|
|
NS_ASSERTION(GetContentEnd() - mContentOffset >= 0, "negative length");
|
|
return GetContentEnd() - mContentOffset;
|
|
}
|
|
int32_t GetContentEnd() const;
|
|
// This returns the length the frame thinks it *should* have after it was
|
|
// last reflowed (0 if it hasn't been reflowed yet). This should be used only
|
|
// when setting up the text offsets for a new continuation frame.
|
|
int32_t GetContentLengthHint() const { return mContentLengthHint; }
|
|
|
|
// Compute the length of the content mapped by this frame
|
|
// and all its in-flow siblings. Basically this means starting at mContentOffset
|
|
// and going to the end of the text node or the next bidi continuation
|
|
// boundary.
|
|
int32_t GetInFlowContentLength();
|
|
|
|
/**
|
|
* Acquires the text run for this content, if necessary.
|
|
* @param aWhichTextRun indicates whether to get an inflated or non-inflated
|
|
* text run
|
|
* @param aRefDrawTarget the DrawTarget to use as a reference for creating the
|
|
* textrun, if available (if not, we'll create one which will just be slower)
|
|
* @param aLineContainer the block ancestor for this frame, or nullptr if
|
|
* unknown
|
|
* @param aFlowEndInTextRun if non-null, this returns the textrun offset of
|
|
* end of the text associated with this frame and its in-flow siblings
|
|
* @return a gfxSkipCharsIterator set up to map DOM offsets for this frame
|
|
* to offsets into the textrun; its initial offset is set to this frame's
|
|
* content offset
|
|
*/
|
|
gfxSkipCharsIterator EnsureTextRun(TextRunType aWhichTextRun,
|
|
DrawTarget* aRefDrawTarget = nullptr,
|
|
nsIFrame* aLineContainer = nullptr,
|
|
const nsLineList::iterator* aLine = nullptr,
|
|
uint32_t* aFlowEndInTextRun = nullptr);
|
|
|
|
gfxTextRun* GetTextRun(TextRunType aWhichTextRun) {
|
|
if (aWhichTextRun == eInflated || !HasFontSizeInflation())
|
|
return mTextRun;
|
|
return GetUninflatedTextRun();
|
|
}
|
|
gfxTextRun* GetUninflatedTextRun();
|
|
void SetTextRun(gfxTextRun* aTextRun, TextRunType aWhichTextRun,
|
|
float aInflation);
|
|
bool IsInTextRunUserData() const {
|
|
return GetStateBits() &
|
|
(TEXT_IN_TEXTRUN_USER_DATA | TEXT_IN_UNINFLATED_TEXTRUN_USER_DATA);
|
|
}
|
|
/**
|
|
* Notify the frame that it should drop its pointer to a text run.
|
|
* Returns whether the text run was removed (i.e., whether it was
|
|
* associated with this frame, either as its inflated or non-inflated
|
|
* text run.
|
|
*/
|
|
bool RemoveTextRun(gfxTextRun* aTextRun);
|
|
/**
|
|
* Clears out |mTextRun| (or the uninflated text run, when aInflated
|
|
* is nsTextFrame::eNotInflated and there is inflation) from all frames that hold a
|
|
* reference to it, starting at |aStartContinuation|, or if it's
|
|
* nullptr, starting at |this|. Deletes the text run if all references
|
|
* were cleared and it's not cached.
|
|
*/
|
|
void ClearTextRun(nsTextFrame* aStartContinuation,
|
|
TextRunType aWhichTextRun);
|
|
|
|
void ClearTextRuns() {
|
|
ClearTextRun(nullptr, nsTextFrame::eInflated);
|
|
if (HasFontSizeInflation()) {
|
|
ClearTextRun(nullptr, nsTextFrame::eNotInflated);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Wipe out references to textrun(s) without deleting the textruns.
|
|
*/
|
|
void DisconnectTextRuns();
|
|
|
|
// Get the DOM content range mapped by this frame after excluding
|
|
// whitespace subject to start-of-line and end-of-line trimming.
|
|
// The textrun must have been created before calling this.
|
|
struct TrimmedOffsets {
|
|
int32_t mStart;
|
|
int32_t mLength;
|
|
int32_t GetEnd() const { return mStart + mLength; }
|
|
};
|
|
TrimmedOffsets GetTrimmedOffsets(const nsTextFragment* aFrag,
|
|
bool aTrimAfter, bool aPostReflow = true);
|
|
|
|
// Similar to Reflow(), but for use from nsLineLayout
|
|
void ReflowText(nsLineLayout& aLineLayout, nscoord aAvailableWidth,
|
|
DrawTarget* aDrawTarget,
|
|
ReflowOutput& aMetrics, nsReflowStatus& aStatus);
|
|
|
|
bool IsFloatingFirstLetterChild() const;
|
|
|
|
bool IsInitialLetterChild() const;
|
|
|
|
virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override;
|
|
|
|
void AssignJustificationGaps(const mozilla::JustificationAssignment& aAssign);
|
|
mozilla::JustificationAssignment GetJustificationAssignment() const;
|
|
|
|
uint32_t CountGraphemeClusters() const;
|
|
|
|
protected:
|
|
virtual ~nsTextFrame();
|
|
|
|
RefPtr<gfxTextRun> mTextRun;
|
|
nsIFrame* mNextContinuation;
|
|
// The key invariant here is that mContentOffset never decreases along
|
|
// a next-continuation chain. And of course mContentOffset is always <= the
|
|
// the text node's content length, and the mContentOffset for the first frame
|
|
// is always 0. Furthermore the text mapped by a frame is determined by
|
|
// GetContentOffset() and GetContentLength()/GetContentEnd(), which get
|
|
// the length from the difference between this frame's offset and the next
|
|
// frame's offset, or the text length if there is no next frame. This means
|
|
// the frames always map the text node without overlapping or leaving any gaps.
|
|
int32_t mContentOffset;
|
|
// This does *not* indicate the length of text currently mapped by the frame;
|
|
// instead it's a hint saying that this frame *wants* to map this much text
|
|
// so if we create a new continuation, this is where that continuation should
|
|
// start.
|
|
int32_t mContentLengthHint;
|
|
nscoord mAscent;
|
|
|
|
/**
|
|
* Return true if the frame is part of a Selection.
|
|
* Helper method to implement the public IsSelected() API.
|
|
*/
|
|
virtual bool IsFrameSelected() const override;
|
|
|
|
// The caller of this method must call DestroySelectionDetails() on the
|
|
// return value, if that return value is not null. Calling
|
|
// DestroySelectionDetails() on a null value is still OK, just not necessary.
|
|
SelectionDetails* GetSelectionDetails();
|
|
|
|
void UnionAdditionalOverflow(nsPresContext* aPresContext,
|
|
nsIFrame* aBlock,
|
|
PropertyProvider& aProvider,
|
|
nsRect* aVisualOverflowRect,
|
|
bool aIncludeTextDecorations);
|
|
|
|
// Update information of emphasis marks, and return the visial
|
|
// overflow rect of the emphasis marks.
|
|
nsRect UpdateTextEmphasis(mozilla::WritingMode aWM,
|
|
PropertyProvider& aProvider);
|
|
|
|
struct PaintShadowParams
|
|
{
|
|
gfxTextRun::Range range;
|
|
LayoutDeviceRect dirtyRect;
|
|
gfxPoint framePt;
|
|
gfxPoint textBaselinePt;
|
|
gfxContext* context;
|
|
nscolor foregroundColor = NS_RGBA(0, 0, 0, 0);
|
|
const nsCharClipDisplayItem::ClipEdges* clipEdges = nullptr;
|
|
PropertyProvider* provider = nullptr;
|
|
nscoord leftSideOffset = 0;
|
|
explicit PaintShadowParams(const PaintTextParams& aParams)
|
|
: dirtyRect(aParams.dirtyRect)
|
|
, framePt(aParams.framePt)
|
|
, context(aParams.context) {}
|
|
};
|
|
|
|
void PaintOneShadow(const PaintShadowParams& aParams,
|
|
nsCSSShadowItem* aShadowDetails,
|
|
gfxRect& aBoundingBox,
|
|
uint32_t aBlurFlags);
|
|
|
|
void PaintShadows(nsCSSShadowArray* aShadow,
|
|
const PaintShadowParams& aParams);
|
|
|
|
struct LineDecoration {
|
|
nsIFrame* mFrame;
|
|
|
|
// This is represents the offset from our baseline to mFrame's baseline;
|
|
// positive offsets are *above* the baseline and negative offsets below
|
|
nscoord mBaselineOffset;
|
|
|
|
nscolor mColor;
|
|
uint8_t mStyle;
|
|
|
|
LineDecoration(nsIFrame *const aFrame,
|
|
const nscoord aOff,
|
|
const nscolor aColor,
|
|
const uint8_t aStyle)
|
|
: mFrame(aFrame),
|
|
mBaselineOffset(aOff),
|
|
mColor(aColor),
|
|
mStyle(aStyle)
|
|
{}
|
|
|
|
LineDecoration(const LineDecoration& aOther)
|
|
: mFrame(aOther.mFrame),
|
|
mBaselineOffset(aOther.mBaselineOffset),
|
|
mColor(aOther.mColor),
|
|
mStyle(aOther.mStyle)
|
|
{}
|
|
|
|
bool operator==(const LineDecoration& aOther) const {
|
|
return mFrame == aOther.mFrame &&
|
|
mStyle == aOther.mStyle &&
|
|
mColor == aOther.mColor &&
|
|
mBaselineOffset == aOther.mBaselineOffset;
|
|
}
|
|
|
|
bool operator!=(const LineDecoration& aOther) const {
|
|
return !(*this == aOther);
|
|
}
|
|
};
|
|
struct TextDecorations {
|
|
AutoTArray<LineDecoration, 1> mOverlines, mUnderlines, mStrikes;
|
|
|
|
TextDecorations() { }
|
|
|
|
bool HasDecorationLines() const {
|
|
return HasUnderline() || HasOverline() || HasStrikeout();
|
|
}
|
|
bool HasUnderline() const {
|
|
return !mUnderlines.IsEmpty();
|
|
}
|
|
bool HasOverline() const {
|
|
return !mOverlines.IsEmpty();
|
|
}
|
|
bool HasStrikeout() const {
|
|
return !mStrikes.IsEmpty();
|
|
}
|
|
bool operator==(const TextDecorations& aOther) const {
|
|
return mOverlines == aOther.mOverlines &&
|
|
mUnderlines == aOther.mUnderlines &&
|
|
mStrikes == aOther.mStrikes;
|
|
}
|
|
|
|
bool operator!=(const TextDecorations& aOther) const {
|
|
return !(*this == aOther);
|
|
}
|
|
|
|
};
|
|
enum TextDecorationColorResolution {
|
|
eResolvedColors,
|
|
eUnresolvedColors
|
|
};
|
|
void GetTextDecorations(nsPresContext* aPresContext,
|
|
TextDecorationColorResolution aColorResolution,
|
|
TextDecorations& aDecorations);
|
|
|
|
void DrawTextRun(Range aRange, const gfxPoint& aTextBaselinePt,
|
|
const DrawTextRunParams& aParams);
|
|
|
|
void DrawTextRunAndDecorations(Range aRange, const gfxPoint& aTextBaselinePt,
|
|
const DrawTextParams& aParams,
|
|
const TextDecorations& aDecorations);
|
|
|
|
void DrawText(Range aRange, const gfxPoint& aTextBaselinePt,
|
|
const DrawTextParams& aParams);
|
|
|
|
// Set non empty rect to aRect, it should be overflow rect or frame rect.
|
|
// If the result rect is larger than the given rect, this returns true.
|
|
bool CombineSelectionUnderlineRect(nsPresContext* aPresContext,
|
|
nsRect& aRect);
|
|
|
|
/**
|
|
* Utility methods to paint selection.
|
|
*/
|
|
void DrawSelectionDecorations(gfxContext* aContext,
|
|
const LayoutDeviceRect& aDirtyRect,
|
|
mozilla::SelectionType aSelectionType,
|
|
nsTextPaintStyle& aTextPaintStyle,
|
|
const TextRangeStyle &aRangeStyle,
|
|
const Point& aPt,
|
|
gfxFloat aICoordInFrame,
|
|
gfxFloat aWidth,
|
|
gfxFloat aAscent,
|
|
const gfxFont::Metrics& aFontMetrics,
|
|
DrawPathCallbacks* aCallbacks,
|
|
bool aVertical,
|
|
gfxFloat aDecorationOffsetDir,
|
|
uint8_t aDecoration);
|
|
|
|
struct PaintDecorationLineParams;
|
|
void PaintDecorationLine(const PaintDecorationLineParams& aParams);
|
|
/**
|
|
* ComputeDescentLimitForSelectionUnderline() computes the most far position
|
|
* where we can put selection underline.
|
|
*
|
|
* @return The maximum underline offset from the baseline (positive value
|
|
* means that the underline can put below the baseline).
|
|
*/
|
|
gfxFloat ComputeDescentLimitForSelectionUnderline(
|
|
nsPresContext* aPresContext,
|
|
const gfxFont::Metrics& aFontMetrics);
|
|
/**
|
|
* This function encapsulates all knowledge of how selections affect
|
|
* foreground and background colors.
|
|
* @param aForeground the foreground color to use
|
|
* @param aBackground the background color to use, or RGBA(0,0,0,0) if no
|
|
* background should be painted
|
|
* @return true if the selection affects colors, false otherwise
|
|
*/
|
|
static bool GetSelectionTextColors(SelectionType aSelectionType,
|
|
nsTextPaintStyle& aTextPaintStyle,
|
|
const TextRangeStyle &aRangeStyle,
|
|
nscolor* aForeground,
|
|
nscolor* aBackground);
|
|
/**
|
|
* ComputeSelectionUnderlineHeight() computes selection underline height of
|
|
* the specified selection type from the font metrics.
|
|
*/
|
|
static gfxFloat ComputeSelectionUnderlineHeight(
|
|
nsPresContext* aPresContext,
|
|
const gfxFont::Metrics& aFontMetrics,
|
|
SelectionType aSelectionType);
|
|
|
|
ContentOffsets GetCharacterOffsetAtFramePointInternal(nsPoint aPoint,
|
|
bool aForInsertionPoint);
|
|
|
|
void ClearFrameOffsetCache();
|
|
|
|
virtual bool HasAnyNoncollapsedCharacters() override;
|
|
|
|
void ClearMetrics(ReflowOutput& aMetrics);
|
|
|
|
/**
|
|
* UpdateIteratorFromOffset() updates the iterator from a given offset.
|
|
* Also, aInOffset may be updated to cluster start if aInOffset isn't
|
|
* the offset of cluster start.
|
|
*/
|
|
void UpdateIteratorFromOffset(const PropertyProvider& aProperties,
|
|
int32_t& aInOffset,
|
|
gfxSkipCharsIterator& aIter);
|
|
|
|
nsPoint GetPointFromIterator(const gfxSkipCharsIterator& aIter,
|
|
PropertyProvider& aProperties);
|
|
};
|
|
|
|
#endif
|