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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsMathMLmfencedFrame_h
#define nsMathMLmfencedFrame_h
#include "mozilla/Attributes.h"
#include "nsMathMLContainerFrame.h"
class nsFontMetrics;
//
// <mfenced> -- surround content with a pair of fences
//
class nsMathMLmfencedFrame final : public nsMathMLContainerFrame {
public:
NS_DECL_FRAMEARENA_HELPERS
friend nsIFrame* NS_NewMathMLmfencedFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
virtual void
SetAdditionalStyleContext(int32_t aIndex,
nsStyleContext* aStyleContext) override;
virtual nsStyleContext*
GetAdditionalStyleContext(int32_t aIndex) const override;
NS_IMETHOD
InheritAutomaticData(nsIFrame* aParent) override;
virtual void
SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList) override;
virtual void
Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) override;
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) override;
virtual void
GetIntrinsicISizeMetrics(nsRenderingContext* aRenderingContext,
ReflowOutput& aDesiredSize) override;
virtual nsresult
AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType) override;
// override the base method because we must keep separators in sync
virtual nsresult
ChildListChanged(int32_t aModType) override;
// override the base method so that we can deal with fences and separators
virtual nscoord
FixInterFrameSpacing(ReflowOutput& aDesiredSize) override;
// helper routines to format the MathMLChars involved here
static nsresult
ReflowChar(nsPresContext* aPresContext,
DrawTarget* aDrawTarget,
nsFontMetrics& aFontMetrics,
float aFontSizeInflation,
nsMathMLChar* aMathMLChar,
nsOperatorFlags aForm,
int32_t aScriptLevel,
nscoord axisHeight,
nscoord leading,
nscoord em,
nsBoundingMetrics& aContainerSize,
nscoord& aAscent,
nscoord& aDescent,
bool aRTL);
static void
PlaceChar(nsMathMLChar* aMathMLChar,
nscoord aDesiredSize,
nsBoundingMetrics& bm,
nscoord& dx);
virtual bool
IsMrowLike() override
{
// Always treated as an mrow with > 1 child as
// <mfenced> <mo>%</mo> </mfenced>
// renders equivalently to
// <mrow> <mo> ( </mo> <mo>%</mo> <mo> ) </mo> </mrow>
// This also holds with multiple children. (MathML3 3.3.8.1)
return true;
}
protected:
explicit nsMathMLmfencedFrame(nsStyleContext* aContext) : nsMathMLContainerFrame(aContext) {}
virtual ~nsMathMLmfencedFrame();
nsMathMLChar* mOpenChar;
nsMathMLChar* mCloseChar;
nsMathMLChar* mSeparatorsChar;
int32_t mSeparatorsCount;
// clean up
void
RemoveFencesAndSeparators();
// add fences and separators when all child frames are known
void
CreateFencesAndSeparators(nsPresContext* aPresContext);
};
#endif /* nsMathMLmfencedFrame_h */
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