The Tor Browser: layout/mathml/nsMathMLmfencedFrame.h@7e26c7da4463

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #ifndef nsMathMLmfencedFrame_h

     7 #define nsMathMLmfencedFrame_h

     9 #include "mozilla/Attributes.h"

    10 #include "nsMathMLContainerFrame.h"

    12 //

    13 // <mfenced> -- surround content with a pair of fences

    14 //

    16 class nsMathMLmfencedFrame : public nsMathMLContainerFrame {

    17 public:

    18   NS_DECL_FRAMEARENA_HELPERS

    20   friend nsIFrame* NS_NewMathMLmfencedFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);

    22   virtual void

    23   SetAdditionalStyleContext(int32_t          aIndex,

    24                             nsStyleContext*  aStyleContext) MOZ_OVERRIDE;

    25   virtual nsStyleContext*

    26   GetAdditionalStyleContext(int32_t aIndex) const MOZ_OVERRIDE;

    28   NS_IMETHOD

    29   InheritAutomaticData(nsIFrame* aParent) MOZ_OVERRIDE;

    31   virtual nsresult

    32   SetInitialChildList(ChildListID     aListID,

    33                       nsFrameList&    aChildList) MOZ_OVERRIDE;

    35   virtual nsresult

    36   Reflow(nsPresContext*          aPresContext,

    37          nsHTMLReflowMetrics&     aDesiredSize,

    38          const nsHTMLReflowState& aReflowState,

    39          nsReflowStatus&          aStatus) MOZ_OVERRIDE;

    41   virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,

    42                                 const nsRect&           aDirtyRect,

    43                                 const nsDisplayListSet& aLists) MOZ_OVERRIDE;

    45   virtual void

    46   GetIntrinsicWidthMetrics(nsRenderingContext* aRenderingContext,

    47                            nsHTMLReflowMetrics& aDesiredSize) MOZ_OVERRIDE;

    49   virtual nsresult

    50   AttributeChanged(int32_t         aNameSpaceID,

    51                    nsIAtom*        aAttribute,

    52                    int32_t         aModType) MOZ_OVERRIDE;

    54   // override the base method because we must keep separators in sync

    55   virtual nsresult

    56   ChildListChanged(int32_t aModType) MOZ_OVERRIDE;

    58   // override the base method so that we can deal with fences and separators

    59   virtual nscoord

    60   FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize) MOZ_OVERRIDE;

    62   // helper routines to format the MathMLChars involved here

    63   static nsresult

    64   ReflowChar(nsPresContext*      aPresContext,

    65              nsRenderingContext& aRenderingContext,

    66              nsMathMLChar*        aMathMLChar,

    67              nsOperatorFlags      aForm,

    68              int32_t              aScriptLevel,

    69              nscoord              axisHeight,

    70              nscoord              leading,

    71              nscoord              em,

    72              nsBoundingMetrics&   aContainerSize,

    73              nscoord&             aAscent,

    74              nscoord&             aDescent,

    75              bool                 aRTL);

    77   static void

    78   PlaceChar(nsMathMLChar*      aMathMLChar,

    79             nscoord            aDesiredSize,

    80             nsBoundingMetrics& bm,

    81             nscoord&           dx);

    83   virtual bool

    84   IsMrowLike() MOZ_OVERRIDE

    85   {

    86     // Always treated as an mrow with > 1 child as

    87     // <mfenced> <mo>%</mo> </mfenced>

    88     // renders equivalently to

    89     // <mrow> <mo> ( </mo> <mo>%</mo> <mo> ) </mo> </mrow>

    90     // This also holds with multiple children.  (MathML3 3.3.8.1)

    91     return true;

    92   }

    94 protected:

    95   nsMathMLmfencedFrame(nsStyleContext* aContext) : nsMathMLContainerFrame(aContext) {}

    96   virtual ~nsMathMLmfencedFrame();

    98   nsMathMLChar* mOpenChar;

    99   nsMathMLChar* mCloseChar;

   100   nsMathMLChar* mSeparatorsChar;

   101   int32_t       mSeparatorsCount;

   103   // clean up

   104   void

   105   RemoveFencesAndSeparators();

   107   // add fences and separators when all child frames are known

   108   void

   109   CreateFencesAndSeparators(nsPresContext* aPresContext);

   110 };

   112 #endif /* nsMathMLmfencedFrame_h */

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