зеркало из https://github.com/mozilla/gecko-dev.git
1015 строки
40 KiB
C++
1015 строки
40 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#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 "mozilla/UniquePtr.h"
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#include "mozilla/dom/Text.h"
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#include "nsIFrame.h"
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#include "nsFrameSelection.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 "nsFontMetrics.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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struct SelectionDetails;
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class nsTextFragment;
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namespace mozilla {
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class SVGContextPaint;
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class SVGTextFrame;
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} // namespace mozilla
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class nsTextFrame : public nsIFrame {
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typedef mozilla::LayoutDeviceRect LayoutDeviceRect;
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typedef mozilla::SelectionTypeMask SelectionTypeMask;
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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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enum TextRunType : uint8_t;
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struct TabWidthStore;
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/**
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* An implementation of gfxTextRun::PropertyProvider that computes spacing and
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* hyphenation based on CSS properties for a text frame.
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*/
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class MOZ_STACK_CLASS PropertyProvider final
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: public gfxTextRun::PropertyProvider {
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typedef gfxTextRun::Range Range;
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typedef gfxTextRun::HyphenType HyphenType;
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typedef mozilla::gfx::DrawTarget DrawTarget;
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public:
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/**
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* Use this constructor for reflow, when we don't know what text is
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* really mapped by the frame and we have a lot of other data around.
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*
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* @param aLength can be INT32_MAX to indicate we cover all the text
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* associated with aFrame up to where its flow chain ends in the given
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* textrun. If INT32_MAX is passed, justification and hyphen-related methods
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* cannot be called, nor can GetOriginalLength().
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*/
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PropertyProvider(gfxTextRun* aTextRun, const nsStyleText* aTextStyle,
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const nsTextFragment* aFrag, nsTextFrame* aFrame,
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const gfxSkipCharsIterator& aStart, int32_t aLength,
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nsIFrame* aLineContainer,
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nscoord aOffsetFromBlockOriginForTabs,
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nsTextFrame::TextRunType aWhichTextRun);
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/**
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* Use this constructor after the frame has been reflowed and we don't
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* have other data around. Gets everything from the frame. EnsureTextRun
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* *must* be called before this!!!
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*/
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PropertyProvider(nsTextFrame* aFrame, const gfxSkipCharsIterator& aStart,
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nsTextFrame::TextRunType aWhichTextRun,
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nsFontMetrics* aFontMetrics);
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/**
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* As above, but assuming we want the inflated text run and associated
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* metrics.
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*/
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PropertyProvider(nsTextFrame* aFrame, const gfxSkipCharsIterator& aStart)
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: PropertyProvider(aFrame, aStart, nsTextFrame::eInflated,
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aFrame->InflatedFontMetrics()) {}
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// Call this after construction if you're not going to reflow the text
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void InitializeForDisplay(bool aTrimAfter);
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void InitializeForMeasure();
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void GetSpacing(Range aRange, Spacing* aSpacing) const final;
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gfxFloat GetHyphenWidth() const final;
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void GetHyphenationBreaks(Range aRange,
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HyphenType* aBreakBefore) const final;
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mozilla::StyleHyphens GetHyphensOption() const final {
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return mTextStyle->mHyphens;
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}
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already_AddRefed<DrawTarget> GetDrawTarget() const final;
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uint32_t GetAppUnitsPerDevUnit() const final {
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return mTextRun->GetAppUnitsPerDevUnit();
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}
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void GetSpacingInternal(Range aRange, Spacing* aSpacing,
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bool aIgnoreTabs) const;
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/**
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* Compute the justification information in given DOM range, return
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* justification info and assignments if requested.
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*/
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mozilla::JustificationInfo ComputeJustification(
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Range aRange,
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nsTArray<mozilla::JustificationAssignment>* aAssignments = nullptr);
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const nsTextFrame* GetFrame() const { return mFrame; }
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// This may not be equal to the frame offset/length in because we may have
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// adjusted for whitespace trimming according to the state bits set in the
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// frame (for the static provider)
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const gfxSkipCharsIterator& GetStart() const { return mStart; }
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// May return INT32_MAX if that was given to the constructor
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uint32_t GetOriginalLength() const {
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NS_ASSERTION(mLength != INT32_MAX, "Length not known");
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return mLength;
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}
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const nsTextFragment* GetFragment() const { return mFrag; }
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gfxFontGroup* GetFontGroup() const {
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if (!mFontGroup) {
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mFontGroup = GetFontMetrics()->GetThebesFontGroup();
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}
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return mFontGroup;
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}
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nsFontMetrics* GetFontMetrics() const {
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if (!mFontMetrics) {
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InitFontGroupAndFontMetrics();
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}
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return mFontMetrics;
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}
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void CalcTabWidths(Range aTransformedRange, gfxFloat aTabWidth) const;
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gfxFloat MinTabAdvance() const;
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const gfxSkipCharsIterator& GetEndHint() const { return mTempIterator; }
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protected:
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void SetupJustificationSpacing(bool aPostReflow);
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void InitFontGroupAndFontMetrics() const;
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const RefPtr<gfxTextRun> mTextRun;
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mutable gfxFontGroup* mFontGroup;
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mutable RefPtr<nsFontMetrics> mFontMetrics;
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const nsStyleText* mTextStyle;
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const nsTextFragment* mFrag;
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const nsIFrame* mLineContainer;
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nsTextFrame* mFrame;
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gfxSkipCharsIterator mStart; // Offset in original and transformed string
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const gfxSkipCharsIterator mTempIterator;
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// Either null, or pointing to the frame's TabWidthProperty.
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mutable nsTextFrame::TabWidthStore* mTabWidths;
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// How far we've done tab-width calculation; this is ONLY valid when
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// mTabWidths is nullptr (otherwise rely on mTabWidths->mLimit instead).
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// It's a DOM offset relative to the current frame's offset.
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mutable uint32_t mTabWidthsAnalyzedLimit;
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int32_t mLength; // DOM string length, may be INT32_MAX
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const gfxFloat mWordSpacing; // space for each whitespace char
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const gfxFloat mLetterSpacing; // space for each letter
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mutable gfxFloat mMinTabAdvance; // min advance for <tab> char
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mutable gfxFloat mHyphenWidth;
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mutable gfxFloat mOffsetFromBlockOriginForTabs;
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// The values in mJustificationSpacings corresponds to unskipped
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// characters start from mJustificationArrayStart.
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uint32_t mJustificationArrayStart;
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nsTArray<Spacing> mJustificationSpacings;
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const bool mReflowing;
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const nsTextFrame::TextRunType mWhichTextRun;
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};
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explicit nsTextFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
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ClassID aID = kClassID)
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: nsIFrame(aStyle, aPresContext, aID),
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mNextContinuation(nullptr),
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mContentOffset(0),
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mContentLengthHint(0),
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mAscent(0),
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mIsSelected(SelectionState::Unknown) {}
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NS_DECL_FRAMEARENA_HELPERS(nsTextFrame)
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friend class nsContinuingTextFrame;
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// nsQueryFrame
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NS_DECL_QUERYFRAME
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// nsIFrame
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void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists) final;
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void Init(nsIContent* aContent, nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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void DestroyFrom(nsIFrame* aDestructRoot,
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PostDestroyData& aPostDestroyData) override;
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mozilla::Maybe<Cursor> GetCursor(const nsPoint&) final;
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nsresult CharacterDataChanged(const CharacterDataChangeInfo&) final;
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nsTextFrame* GetPrevContinuation() const override { return nullptr; }
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nsTextFrame* GetNextContinuation() const final { return mNextContinuation; }
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void SetNextContinuation(nsIFrame* aNextContinuation) final {
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NS_ASSERTION(!aNextContinuation || Type() == aNextContinuation->Type(),
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"setting a next continuation with incorrect type!");
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NS_ASSERTION(
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!nsSplittableFrame::IsInNextContinuationChain(aNextContinuation, this),
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"creating a loop in continuation chain!");
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mNextContinuation = static_cast<nsTextFrame*>(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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if (GetContent()->HasFlag(NS_HAS_FLOWLENGTH_PROPERTY)) {
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GetContent()->RemoveProperty(nsGkAtoms::flowlength);
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GetContent()->UnsetFlags(NS_HAS_FLOWLENGTH_PROPERTY);
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}
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}
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nsTextFrame* GetNextInFlow() const final {
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return mNextContinuation && mNextContinuation->HasAnyStateBits(
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NS_FRAME_IS_FLUID_CONTINUATION)
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? mNextContinuation
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: nullptr;
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}
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void SetNextInFlow(nsIFrame* aNextInFlow) final {
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NS_ASSERTION(!aNextInFlow || Type() == aNextInFlow->Type(),
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"setting a next in flow with incorrect type!");
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NS_ASSERTION(
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!nsSplittableFrame::IsInNextContinuationChain(aNextInFlow, this),
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"creating a loop in continuation chain!");
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mNextContinuation = static_cast<nsTextFrame*>(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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if (GetContent()->HasFlag(NS_HAS_FLOWLENGTH_PROPERTY)) {
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GetContent()->RemoveProperty(nsGkAtoms::flowlength);
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GetContent()->UnsetFlags(NS_HAS_FLOWLENGTH_PROPERTY);
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}
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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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nsTextFrame* LastInFlow() const final;
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nsTextFrame* LastContinuation() const final;
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bool IsFrameOfType(uint32_t aFlags) const final {
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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 nsIFrame::IsFrameOfType(
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aFlags & ~(nsIFrame::eReplaced | nsIFrame::eLineParticipant));
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}
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bool ShouldSuppressLineBreak() const {
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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()->Type())) {
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return true;
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}
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return Style()->ShouldSuppressLineBreak();
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}
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void InvalidateFrame(uint32_t aDisplayItemKey = 0,
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bool aRebuildDisplayItems = true) final;
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void InvalidateFrameWithRect(const nsRect& aRect,
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uint32_t aDisplayItemKey = 0,
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bool aRebuildDisplayItems = true) final;
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#ifdef DEBUG_FRAME_DUMP
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void List(FILE* out = stderr, const char* aPrefix = "",
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ListFlags aFlags = ListFlags()) const final;
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nsresult GetFrameName(nsAString& aResult) const final;
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void ToCString(nsCString& aBuf, int32_t* aTotalContentLength) const;
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void ListTextRuns(FILE* out, nsTHashSet<const void*>& aSeen) const final;
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#endif
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// Returns this text frame's content's text fragment.
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//
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// Assertions in Init() ensure we only ever get a Text node as content.
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const nsTextFragment* TextFragment() const {
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return &mContent->AsText()->TextFragment();
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}
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ContentOffsets CalcContentOffsetsFromFramePoint(const nsPoint& aPoint) final;
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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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* Frames corresponding to the character range are unconditionally invalidated
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* (Selection::Repaint depends on this).
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* @param aStart start of character range.
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* @param aEnd end (exclusive) of character range.
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* @param aSelected true iff the character range is now selected.
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* @param aType the type of the changed selection.
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*/
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void SelectionStateChanged(uint32_t aStart, uint32_t aEnd, bool aSelected,
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SelectionType aSelectionType);
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FrameSearchResult PeekOffsetNoAmount(bool aForward, int32_t* aOffset) final;
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FrameSearchResult PeekOffsetCharacter(
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bool aForward, int32_t* aOffset,
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PeekOffsetCharacterOptions aOptions = PeekOffsetCharacterOptions()) final;
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FrameSearchResult PeekOffsetWord(bool aForward, bool aWordSelectEatSpace,
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bool aIsKeyboardSelect, int32_t* aOffset,
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PeekWordState* aState,
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bool aTrimSpaces) final;
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nsresult CheckVisibility(nsPresContext* aContext, int32_t aStartIndex,
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int32_t aEndIndex, bool aRecurse, bool* aFinished,
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bool* _retval) final;
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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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std::pair<int32_t, int32_t> GetOffsets() const final;
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void AdjustOffsetsForBidi(int32_t start, int32_t end) final;
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nsresult GetPointFromOffset(int32_t inOffset, nsPoint* outPoint) final;
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nsresult GetCharacterRectsInRange(int32_t aInOffset, int32_t aLength,
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nsTArray<nsRect>& aRects) final;
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nsresult GetChildFrameContainingOffset(int32_t inContentOffset, bool inHint,
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int32_t* outFrameContentOffset,
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nsIFrame** outChildFrame) final;
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bool IsEmpty() final;
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bool IsSelfEmpty() final { return IsEmpty(); }
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nscoord GetLogicalBaseline(mozilla::WritingMode aWritingMode) const final;
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bool HasSignificantTerminalNewline() const final;
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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 HasAnyStateBits(TEXT_HAS_NONCOLLAPSED_CHARACTERS);
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}
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#ifdef ACCESSIBILITY
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mozilla::a11y::AccType AccessibleType() final;
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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 HasAnyStateBits(TEXT_HAS_FONT_INFLATION);
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}
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void SetFontSizeInflation(float aInflation);
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void MarkIntrinsicISizesDirty() final;
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nscoord GetMinISize(gfxContext* aRenderingContext) final;
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nscoord GetPrefISize(gfxContext* aRenderingContext) final;
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void AddInlineMinISize(gfxContext* aRenderingContext,
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InlineMinISizeData* aData) override;
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void AddInlinePrefISize(gfxContext* aRenderingContext,
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InlinePrefISizeData* aData) override;
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SizeComputationResult ComputeSize(
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gfxContext* aRenderingContext, mozilla::WritingMode aWM,
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const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
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const mozilla::LogicalSize& aMargin,
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const mozilla::LogicalSize& aBorderPadding,
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const mozilla::StyleSizeOverrides& aSizeOverrides,
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mozilla::ComputeSizeFlags aFlags) final;
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nsRect ComputeTightBounds(DrawTarget* aDrawTarget) const final;
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nsresult GetPrefWidthTightBounds(gfxContext* aContext, nscoord* aX,
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nscoord* aXMost) final;
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void Reflow(nsPresContext* aPresContext, ReflowOutput& aMetrics,
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const ReflowInput& aReflowInput, nsReflowStatus& aStatus) final;
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bool CanContinueTextRun() const final;
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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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RenderedText GetRenderedText(
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uint32_t aStartOffset = 0, uint32_t aEndOffset = UINT32_MAX,
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TextOffsetType aOffsetType = TextOffsetType::OffsetsInContentText,
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TrailingWhitespace aTrimTrailingWhitespace =
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TrailingWhitespace::Trim) final;
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mozilla::OverflowAreas RecomputeOverflow(nsIFrame* aBlockFrame,
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bool aIncludeShadows = true);
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enum TextRunType : uint8_t {
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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(gfxContext* aRenderingContext,
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nsIFrame::InlineMinISizeData* aData,
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TextRunType aTextRunType);
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void AddInlinePrefISizeForFlow(gfxContext* 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.
|
|
* @return true if at least one whole grapheme cluster fit between the edges
|
|
*/
|
|
bool MeasureCharClippedText(PropertyProvider& aProvider,
|
|
nscoord aVisIStartEdge, nscoord aVisIEndEdge,
|
|
uint32_t* aStartOffset, uint32_t* aMaxLength,
|
|
nscoord* aSnappedStartEdge,
|
|
nscoord* aSnappedEndEdge);
|
|
|
|
/**
|
|
* Return true if this box has some text to display.
|
|
* It returns false if at least one of these conditions are met:
|
|
* a. the frame hasn't been reflowed yet
|
|
* b. GetContentLength() == 0
|
|
* c. it contains only non-significant white-space
|
|
*/
|
|
bool HasNonSuppressedText() const;
|
|
|
|
/**
|
|
* Object with various callbacks for PaintText() to invoke for different parts
|
|
* of the frame's text rendering, when we're generating paths rather than
|
|
* painting.
|
|
*
|
|
* Callbacks are invoked in the following order:
|
|
*
|
|
* NotifySelectionBackgroundNeedsFill?
|
|
* PaintDecorationLine*
|
|
* NotifyBeforeText
|
|
* NotifyGlyphPathEmitted*
|
|
* NotifyAfterText
|
|
* PaintDecorationLine*
|
|
* PaintSelectionDecorationLine*
|
|
*
|
|
* The color of each part of the frame's text rendering is passed as an
|
|
* argument to the NotifyBefore* callback for that part. The nscolor can take
|
|
* on one of the three selection special colors defined in LookAndFeel.h --
|
|
* NS_TRANSPARENT, NS_SAME_AS_FOREGROUND_COLOR and
|
|
* NS_40PERCENT_FOREGROUND_COLOR.
|
|
*/
|
|
struct DrawPathCallbacks : gfxTextRunDrawCallbacks {
|
|
/**
|
|
* @param aShouldPaintSVGGlyphs Whether SVG glyphs should be painted.
|
|
*/
|
|
explicit DrawPathCallbacks(bool aShouldPaintSVGGlyphs = false)
|
|
: gfxTextRunDrawCallbacks(aShouldPaintSVGGlyphs) {}
|
|
|
|
/**
|
|
* Called to have the selection highlight drawn before the text is drawn
|
|
* over the top.
|
|
*/
|
|
virtual void NotifySelectionBackgroundNeedsFill(const Rect& aBackgroundRect,
|
|
nscolor aColor,
|
|
DrawTarget& aDrawTarget) {}
|
|
|
|
/**
|
|
* Called before (for under/over-line) or after (for line-through) the text
|
|
* is drawn to have a text decoration line drawn.
|
|
*/
|
|
virtual void PaintDecorationLine(Rect aPath, nscolor aColor) {}
|
|
|
|
/**
|
|
* Called after selected text is drawn to have a decoration line drawn over
|
|
* the text. (All types of text decoration are drawn after the text when
|
|
* text is selected.)
|
|
*/
|
|
virtual void PaintSelectionDecorationLine(Rect aPath, nscolor aColor) {}
|
|
|
|
/**
|
|
* Called just before any paths have been emitted to the gfxContext
|
|
* for the glyphs of the frame's text.
|
|
*/
|
|
virtual void NotifyBeforeText(nscolor aColor) {}
|
|
|
|
/**
|
|
* Called just after all the paths have been emitted to the gfxContext
|
|
* for the glyphs of the frame's text.
|
|
*/
|
|
virtual void NotifyAfterText() {}
|
|
|
|
/**
|
|
* Called just before a path corresponding to a selection decoration line
|
|
* has been emitted to the gfxContext.
|
|
*/
|
|
virtual void NotifyBeforeSelectionDecorationLine(nscolor aColor) {}
|
|
|
|
/**
|
|
* Called just after a path corresponding to a selection decoration line
|
|
* has been emitted to the gfxContext.
|
|
*/
|
|
virtual void NotifySelectionDecorationLinePathEmitted() {}
|
|
};
|
|
|
|
struct PaintTextParams {
|
|
gfxContext* context;
|
|
mozilla::gfx::Point framePt;
|
|
LayoutDeviceRect dirtyRect;
|
|
mozilla::SVGContextPaint* contextPaint = nullptr;
|
|
DrawPathCallbacks* callbacks = nullptr;
|
|
enum {
|
|
PaintText, // Normal text painting.
|
|
GenerateTextMask // To generate a mask from a text frame. Should
|
|
// only paint text itself with opaque color.
|
|
// Text shadow, text selection color and text
|
|
// decoration are all discarded in this state.
|
|
};
|
|
uint8_t state = PaintText;
|
|
explicit PaintTextParams(gfxContext* aContext) : context(aContext) {}
|
|
|
|
bool IsPaintText() const { return state == PaintText; }
|
|
bool IsGenerateTextMask() const { return state == GenerateTextMask; }
|
|
};
|
|
|
|
struct PaintTextSelectionParams : PaintTextParams {
|
|
mozilla::gfx::Point textBaselinePt;
|
|
PropertyProvider* provider = nullptr;
|
|
Range contentRange;
|
|
nsTextPaintStyle* textPaintStyle = nullptr;
|
|
Range glyphRange;
|
|
explicit PaintTextSelectionParams(const PaintTextParams& aParams)
|
|
: PaintTextParams(aParams) {}
|
|
};
|
|
|
|
struct DrawTextRunParams {
|
|
gfxContext* context;
|
|
PropertyProvider* provider = nullptr;
|
|
gfxFloat* advanceWidth = nullptr;
|
|
mozilla::SVGContextPaint* contextPaint = nullptr;
|
|
DrawPathCallbacks* callbacks = nullptr;
|
|
nscolor textColor = NS_RGBA(0, 0, 0, 0);
|
|
nscolor textStrokeColor = NS_RGBA(0, 0, 0, 0);
|
|
float textStrokeWidth = 0.0f;
|
|
bool drawSoftHyphen = false;
|
|
explicit DrawTextRunParams(gfxContext* aContext) : context(aContext) {}
|
|
};
|
|
|
|
struct DrawTextParams : DrawTextRunParams {
|
|
mozilla::gfx::Point framePt;
|
|
LayoutDeviceRect dirtyRect;
|
|
const nsTextPaintStyle* textStyle = nullptr;
|
|
const nsDisplayText::ClipEdges* clipEdges = nullptr;
|
|
const nscolor* decorationOverrideColor = nullptr;
|
|
Range glyphRange;
|
|
explicit DrawTextParams(gfxContext* aContext)
|
|
: DrawTextRunParams(aContext) {}
|
|
};
|
|
|
|
// Primary frame paint method called from nsDisplayText. Can also be used
|
|
// to generate paths rather than paint the frame's text by passing a callback
|
|
// object. The private DrawText() is what applies the text to a graphics
|
|
// context.
|
|
void PaintText(const PaintTextParams& aParams, const nscoord aVisIStartEdge,
|
|
const nscoord aVisIEndEdge, const nsPoint& aToReferenceFrame,
|
|
const bool aIsSelected, float aOpacity = 1.0f);
|
|
// helper: paint text frame when we're impacted by at least one selection.
|
|
// Return false if the text was not painted and we should continue with
|
|
// the fast path.
|
|
bool PaintTextWithSelection(const PaintTextSelectionParams& aParams,
|
|
const nsDisplayText::ClipEdges& aClipEdges);
|
|
// helper: paint text with foreground and background colors determined
|
|
// by selection(s). Also computes a mask of all selection types applying to
|
|
// our text, returned in aAllSelectionTypeMask.
|
|
// Return false if the text was not painted and we should continue with
|
|
// the fast path.
|
|
bool PaintTextWithSelectionColors(
|
|
const PaintTextSelectionParams& aParams,
|
|
const mozilla::UniquePtr<SelectionDetails>& aDetails,
|
|
SelectionTypeMask* aAllSelectionTypeMask,
|
|
const nsDisplayText::ClipEdges& aClipEdges);
|
|
// helper: paint text decorations for text selected by aSelectionType
|
|
void PaintTextSelectionDecorations(
|
|
const PaintTextSelectionParams& aParams,
|
|
const mozilla::UniquePtr<SelectionDetails>& aDetails,
|
|
SelectionType aSelectionType);
|
|
|
|
void DrawEmphasisMarks(gfxContext* aContext, mozilla::WritingMode aWM,
|
|
const mozilla::gfx::Point& aTextBaselinePt,
|
|
const mozilla::gfx::Point& aFramePt, Range aRange,
|
|
const nscolor* aDecorationOverrideColor,
|
|
PropertyProvider* aProvider);
|
|
|
|
nscolor GetCaretColorAt(int32_t aOffset) final;
|
|
|
|
// @param aSelectionFlags may be multiple of nsISelectionDisplay::DISPLAY_*.
|
|
// @return nsISelectionController.idl's `getDisplaySelection`.
|
|
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) const {
|
|
if (aWhichTextRun == eInflated || !HasFontSizeInflation()) return mTextRun;
|
|
return GetUninflatedTextRun();
|
|
}
|
|
gfxTextRun* GetUninflatedTextRun() const;
|
|
void SetTextRun(gfxTextRun* aTextRun, TextRunType aWhichTextRun,
|
|
float aInflation);
|
|
bool IsInTextRunUserData() const {
|
|
return HasAnyStateBits(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; }
|
|
};
|
|
enum class TrimmedOffsetFlags : uint8_t {
|
|
Default = 0,
|
|
NotPostReflow = 1 << 0,
|
|
NoTrimAfter = 1 << 1,
|
|
NoTrimBefore = 1 << 2
|
|
};
|
|
TrimmedOffsets GetTrimmedOffsets(
|
|
const nsTextFragment* aFrag,
|
|
TrimmedOffsetFlags aFlags = TrimmedOffsetFlags::Default) const;
|
|
|
|
// 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;
|
|
|
|
bool ComputeCustomOverflow(mozilla::OverflowAreas& aOverflowAreas) final;
|
|
bool ComputeCustomOverflowInternal(mozilla::OverflowAreas& aOverflowAreas,
|
|
bool aIncludeShadows);
|
|
|
|
void AssignJustificationGaps(const mozilla::JustificationAssignment& aAssign);
|
|
mozilla::JustificationAssignment GetJustificationAssignment() const;
|
|
|
|
uint32_t CountGraphemeClusters() const;
|
|
|
|
bool HasAnyNoncollapsedCharacters() final;
|
|
|
|
/**
|
|
* Call this after you have manually changed the text node contents without
|
|
* notifying that change. This behaves as if all the text contents changed.
|
|
* (You should only use this for native anonymous content.)
|
|
*/
|
|
void NotifyNativeAnonymousTextnodeChange(uint32_t aOldLength);
|
|
|
|
void SetInflatedFontMetrics(nsFontMetrics* aMetrics) {
|
|
mFontMetrics = aMetrics;
|
|
}
|
|
nsFontMetrics* InflatedFontMetrics() const { return mFontMetrics; }
|
|
|
|
nsRect WebRenderBounds();
|
|
|
|
protected:
|
|
virtual ~nsTextFrame();
|
|
|
|
friend class nsDisplayTextGeometry;
|
|
friend class nsDisplayText;
|
|
|
|
RefPtr<nsFontMetrics> mFontMetrics;
|
|
RefPtr<gfxTextRun> mTextRun;
|
|
nsTextFrame* 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;
|
|
|
|
// Cached selection state.
|
|
enum class SelectionState : uint8_t {
|
|
Unknown,
|
|
Selected,
|
|
NotSelected,
|
|
};
|
|
mutable SelectionState mIsSelected;
|
|
|
|
/**
|
|
* Return true if the frame is part of a Selection.
|
|
* Helper method to implement the public IsSelected() API.
|
|
*/
|
|
bool IsFrameSelected() const final;
|
|
|
|
void InvalidateSelectionState() { mIsSelected = SelectionState::Unknown; }
|
|
|
|
mozilla::UniquePtr<SelectionDetails> GetSelectionDetails();
|
|
|
|
void UnionAdditionalOverflow(nsPresContext* aPresContext, nsIFrame* aBlock,
|
|
PropertyProvider& aProvider,
|
|
nsRect* aInkOverflowRect,
|
|
bool aIncludeTextDecorations,
|
|
bool aIncludeShadows);
|
|
|
|
// 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;
|
|
mozilla::gfx::Point framePt;
|
|
mozilla::gfx::Point textBaselinePt;
|
|
gfxContext* context;
|
|
nscolor foregroundColor = NS_RGBA(0, 0, 0, 0);
|
|
const nsDisplayText::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,
|
|
const mozilla::StyleSimpleShadow& aShadowDetails,
|
|
gfxRect& aBoundingBox, uint32_t aBlurFlags);
|
|
|
|
void PaintShadows(mozilla::Span<const mozilla::StyleSimpleShadow>,
|
|
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;
|
|
|
|
// This represents the offset from the initial position of the underline
|
|
const mozilla::LengthPercentageOrAuto mTextUnderlineOffset;
|
|
|
|
// for CSS property text-decoration-thickness, the width refers to the
|
|
// thickness of the decoration line
|
|
const mozilla::StyleTextDecorationLength mTextDecorationThickness;
|
|
nscolor mColor;
|
|
uint8_t mStyle;
|
|
|
|
// The text-underline-position property; affects the underline offset only
|
|
// if mTextUnderlineOffset is auto.
|
|
const mozilla::StyleTextUnderlinePosition mTextUnderlinePosition;
|
|
|
|
LineDecoration(nsIFrame* const aFrame, const nscoord aOff,
|
|
mozilla::StyleTextUnderlinePosition aUnderlinePosition,
|
|
const mozilla::LengthPercentageOrAuto& aUnderlineOffset,
|
|
const mozilla::StyleTextDecorationLength& aDecThickness,
|
|
const nscolor aColor, const uint8_t aStyle)
|
|
: mFrame(aFrame),
|
|
mBaselineOffset(aOff),
|
|
mTextUnderlineOffset(aUnderlineOffset),
|
|
mTextDecorationThickness(aDecThickness),
|
|
mColor(aColor),
|
|
mStyle(aStyle),
|
|
mTextUnderlinePosition(aUnderlinePosition) {}
|
|
|
|
LineDecoration(const LineDecoration& aOther) = default;
|
|
|
|
bool operator==(const LineDecoration& aOther) const {
|
|
return mFrame == aOther.mFrame && mStyle == aOther.mStyle &&
|
|
mColor == aOther.mColor &&
|
|
mBaselineOffset == aOther.mBaselineOffset &&
|
|
mTextUnderlinePosition == aOther.mTextUnderlinePosition &&
|
|
mTextUnderlineOffset == aOther.mTextUnderlineOffset &&
|
|
mTextDecorationThickness == aOther.mTextDecorationThickness;
|
|
}
|
|
|
|
bool operator!=(const LineDecoration& aOther) const {
|
|
return !(*this == aOther);
|
|
}
|
|
};
|
|
struct TextDecorations {
|
|
AutoTArray<LineDecoration, 1> mOverlines, mUnderlines, mStrikes;
|
|
|
|
TextDecorations() = default;
|
|
|
|
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 mozilla::gfx::Point& aTextBaselinePt,
|
|
const DrawTextRunParams& aParams);
|
|
|
|
void DrawTextRunAndDecorations(Range aRange,
|
|
const mozilla::gfx::Point& aTextBaselinePt,
|
|
const DrawTextParams& aParams,
|
|
const TextDecorations& aDecorations);
|
|
|
|
void DrawText(Range aRange, const mozilla::gfx::Point& 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, mozilla::StyleTextDecorationLine 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(
|
|
const nsPoint& aPoint, bool aForInsertionPoint);
|
|
|
|
static float GetTextCombineScaleFactor(nsTextFrame* aFrame);
|
|
|
|
void ClearFrameOffsetCache();
|
|
|
|
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);
|
|
|
|
public:
|
|
};
|
|
|
|
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(nsTextFrame::TrimmedOffsetFlags)
|
|
|
|
#endif
|