layout/mathml/nsMathMLmrowFrame.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef nsMathMLmrowFrame_h___
   8 #define nsMathMLmrowFrame_h___
   9
  10 #include "mozilla/Attributes.h"
  11 #include "nsMathMLContainerFrame.h"
  12
  13 namespace mozilla {
  14 class PresShell;
  15 }  // namespace mozilla
  16
  17 //
  18 // <mrow> -- horizontally group any number of subexpressions
  19 // <mphantom> -- make content invisible but preserve its size
  20 // <mstyle> -- make style changes that affect the rendering of its contents
  21 //
  22
  23 class nsMathMLmrowFrame final : public nsMathMLContainerFrame {
  24  public:
  25   NS_DECL_FRAMEARENA_HELPERS(nsMathMLmrowFrame)
  26
  27   friend nsIFrame* NS_NewMathMLmrowFrame(mozilla::PresShell* aPresShell,
  28                                          ComputedStyle* aStyle);
  29
  30   virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
  31                                     int32_t aModType) override;
  32
  33   NS_IMETHOD
  34   InheritAutomaticData(nsIFrame* aParent) override;
  35
  36   NS_IMETHOD
  37   TransmitAutomaticData() override {
  38     return TransmitAutomaticDataForMrowLikeElement();
  39   }
  40
  41   virtual eMathMLFrameType GetMathMLFrameType() override;
  42
  43   bool IsMrowLike() override {
  44     // <mrow> elements with a single child are treated identically to the case
  45     // where the child wasn't within an mrow, so we pretend the mrow isn't an
  46     // mrow in that situation.
  47     return mFrames.FirstChild() != mFrames.LastChild() || !mFrames.FirstChild();
  48   }
  49
  50  protected:
  51   explicit nsMathMLmrowFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
  52       : nsMathMLContainerFrame(aStyle, aPresContext, kClassID) {}
  53   virtual ~nsMathMLmrowFrame();
  54 };
  55
  56 #endif /* nsMathMLmrowFrame_h___ */