зеркало из https://github.com/mozilla/gecko-dev.git
105 строки
3.8 KiB
C++
105 строки
3.8 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 nsMathMLmfencedFrame_h
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#define nsMathMLmfencedFrame_h
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#include "mozilla/Attributes.h"
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#include "nsMathMLContainerFrame.h"
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class nsFontMetrics;
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namespace mozilla {
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class PresShell;
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} // namespace mozilla
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//
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// <mfenced> -- surround content with a pair of fences
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//
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class nsMathMLmfencedFrame final : public nsMathMLContainerFrame {
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public:
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NS_DECL_FRAMEARENA_HELPERS(nsMathMLmfencedFrame)
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friend nsIFrame* NS_NewMathMLmfencedFrame(mozilla::PresShell* aPresShell,
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ComputedStyle* aStyle);
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void DestroyFrom(nsIFrame* aDestructRoot,
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PostDestroyData& aPostDestroyData) override;
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virtual void SetAdditionalComputedStyle(
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int32_t aIndex, ComputedStyle* aComputedStyle) override;
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virtual ComputedStyle* GetAdditionalComputedStyle(
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int32_t aIndex) const override;
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NS_IMETHOD
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InheritAutomaticData(nsIFrame* aParent) override;
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virtual void SetInitialChildList(ChildListID aListID,
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nsFrameList& aChildList) override;
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virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) override;
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virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists) override;
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virtual void GetIntrinsicISizeMetrics(gfxContext* aRenderingContext,
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ReflowOutput& aDesiredSize) override;
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virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
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int32_t aModType) override;
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// override the base method because we must keep separators in sync
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virtual nsresult ChildListChanged(int32_t aModType) override;
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// override the base method so that we can deal with fences and separators
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virtual nscoord FixInterFrameSpacing(ReflowOutput& aDesiredSize) override;
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// helper routines to format the MathMLChars involved here
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nsresult ReflowChar(DrawTarget* aDrawTarget, nsFontMetrics& aFontMetrics,
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float aFontSizeInflation, nsMathMLChar* aMathMLChar,
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nsOperatorFlags aForm, int32_t aScriptLevel,
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nscoord axisHeight, nscoord leading, nscoord em,
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nsBoundingMetrics& aContainerSize, nscoord& aAscent,
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nscoord& aDescent, bool aRTL);
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static void PlaceChar(nsMathMLChar* aMathMLChar, nscoord aDesiredSize,
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nsBoundingMetrics& bm, nscoord& dx);
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virtual bool IsMrowLike() override {
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// Always treated as an mrow with > 1 child as
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// <mfenced> <mo>%</mo> </mfenced>
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// renders equivalently to
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// <mrow> <mo> ( </mo> <mo>%</mo> <mo> ) </mo> </mrow>
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// This also holds with multiple children. (MathML3 3.3.8.1)
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return true;
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}
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protected:
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explicit nsMathMLmfencedFrame(ComputedStyle* aStyle,
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nsPresContext* aPresContext)
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: nsMathMLContainerFrame(aStyle, aPresContext, kClassID),
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mOpenChar(nullptr),
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mCloseChar(nullptr),
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mSeparatorsChar(nullptr),
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mSeparatorsCount(0) {}
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nsMathMLChar* mOpenChar;
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nsMathMLChar* mCloseChar;
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nsMathMLChar* mSeparatorsChar;
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int32_t mSeparatorsCount;
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// clean up
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void RemoveFencesAndSeparators();
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// add fences and separators when all child frames are known
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void CreateFencesAndSeparators(nsPresContext* aPresContext);
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};
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#endif /* nsMathMLmfencedFrame_h */
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