layout/mathml/nsMathMLmrowFrame.h

   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/. */
   5
   6 #ifndef nsMathMLmrowFrame_h___
   7 #define nsMathMLmrowFrame_h___
   8
   9 #include "mozilla/Attributes.h"
  10 #include "nsMathMLContainerFrame.h"
  11
  12 //
  13 // <mrow> -- horizontally group any number of subexpressions
  14 //
  15
  16 class nsMathMLmrowFrame : public nsMathMLContainerFrame {
  17 public:
  18   NS_DECL_FRAMEARENA_HELPERS
  19
  20   friend nsIFrame* NS_NewMathMLmrowFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
  21
  22   virtual nsresult
  23   AttributeChanged(int32_t  aNameSpaceID,
  24                    nsIAtom* aAttribute,
  25                    int32_t  aModType) MOZ_OVERRIDE;
  26
  27   NS_IMETHOD
  28   InheritAutomaticData(nsIFrame* aParent) MOZ_OVERRIDE;
  29
  30   NS_IMETHOD
  31   TransmitAutomaticData() MOZ_OVERRIDE {
  32     return TransmitAutomaticDataForMrowLikeElement();
  33   }
  34
  35   virtual eMathMLFrameType
  36   GetMathMLFrameType() MOZ_OVERRIDE;
  37
  38   bool
  39   IsMrowLike() MOZ_OVERRIDE {
  40     // <mrow> elements with a single child are treated identically to the case
  41     // where the child wasn't within an mrow, so we pretend the mrow isn't an
  42     // mrow in that situation.
  43     return mFrames.FirstChild() != mFrames.LastChild() ||
  44            !mFrames.FirstChild();
  45   }
  46
  47 protected:
  48   explicit nsMathMLmrowFrame(nsStyleContext* aContext) : nsMathMLContainerFrame(aContext) {}
  49   virtual ~nsMathMLmrowFrame();
  50 };
  51
  52 #endif /* nsMathMLmrowFrame_h___ */