layout/mathml/nsMathMLmrootFrame.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 nsMathMLmrootFrame_h___
   8 #define nsMathMLmrootFrame_h___
   9
  10 #include "mozilla/Attributes.h"
  11 #include "nsMathMLContainerFrame.h"
  12 #include "nsMathMLChar.h"
  13
  14 namespace mozilla {
  15 class PresShell;
  16 }  // namespace mozilla
  17
  18 //
  19 // <msqrt> and <mroot> -- form a radical
  20 //
  21
  22 class nsMathMLmrootFrame final : public nsMathMLContainerFrame {
  23  public:
  24   NS_DECL_FRAMEARENA_HELPERS(nsMathMLmrootFrame)
  25
  26   friend nsIFrame* NS_NewMathMLmrootFrame(mozilla::PresShell* aPresShell,
  27                                           ComputedStyle* aStyle);
  28
  29   void DidSetComputedStyle(ComputedStyle* aOldStyle) override;
  30
  31   virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
  32                     nsIFrame* aPrevInFlow) override;
  33
  34   NS_IMETHOD
  35   TransmitAutomaticData() override;
  36
  37   virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
  38                       const ReflowInput& aReflowInput,
  39                       nsReflowStatus& aStatus) override;
  40
  41   void GetRadicalXOffsets(nscoord aIndexWidth, nscoord aSqrWidth,
  42                           nsFontMetrics* aFontMetrics, nscoord* aIndexOffset,
  43                           nscoord* aSqrOffset);
  44
  45   virtual void GetIntrinsicISizeMetrics(gfxContext* aRenderingContext,
  46                                         ReflowOutput& aDesiredSize) override;
  47
  48   virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
  49                                 const nsDisplayListSet& aLists) override;
  50
  51   uint8_t ScriptIncrement(nsIFrame* aFrame) override {
  52     return (aFrame && aFrame == mFrames.LastChild()) ? 2 : 0;
  53   }
  54
  55  protected:
  56   explicit nsMathMLmrootFrame(ComputedStyle* aStyle,
  57                               nsPresContext* aPresContext);
  58   virtual ~nsMathMLmrootFrame();
  59
  60   nsMathMLChar mSqrChar;
  61   nsRect mBarRect;
  62
  63  private:
  64   bool ShouldUseRowFallback();
  65 };
  66
  67 #endif /* nsMathMLmrootFrame_h___ */