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diff --git a/layout/mathml/nsMathMLmfencedFrame.h b/layout/mathml/nsMathMLmfencedFrame.h
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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 nsRect& aDirtyRect,
+ 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 */