layout/mathml/nsMathMLmpaddedFrame.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 nsMathMLmpaddedFrame_h___
   8 #define nsMathMLmpaddedFrame_h___
   9
  10 #include "mozilla/Attributes.h"
  11 #include "nsCSSValue.h"
  12 #include "nsMathMLContainerFrame.h"
  13
  14 namespace mozilla {
  15 class PresShell;
  16 }  // namespace mozilla
  17
  18 //
  19 // <mpadded> -- adjust space around content
  20 //
  21
  22 class nsMathMLmpaddedFrame final : public nsMathMLContainerFrame {
  23  public:
  24   NS_DECL_FRAMEARENA_HELPERS(nsMathMLmpaddedFrame)
  25
  26   friend nsIFrame* NS_NewMathMLmpaddedFrame(mozilla::PresShell* aPresShell,
  27                                             ComputedStyle* aStyle);
  28
  29   NS_IMETHOD
  30   InheritAutomaticData(nsIFrame* aParent) override;
  31
  32   NS_IMETHOD
  33   TransmitAutomaticData() override {
  34     return TransmitAutomaticDataForMrowLikeElement();
  35   }
  36
  37   virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
  38                       const ReflowInput& aReflowInput,
  39                       nsReflowStatus& aStatus) override;
  40
  41   virtual nsresult Place(DrawTarget* aDrawTarget, bool aPlaceOrigin,
  42                          ReflowOutput& aDesiredSize) override;
  43
  44   bool IsMrowLike() override {
  45     return mFrames.FirstChild() != mFrames.LastChild() || !mFrames.FirstChild();
  46   }
  47
  48  protected:
  49   explicit nsMathMLmpaddedFrame(ComputedStyle* aStyle,
  50                                 nsPresContext* aPresContext)
  51       : nsMathMLContainerFrame(aStyle, aPresContext, kClassID),
  52         mWidthSign(0),
  53         mHeightSign(0),
  54         mDepthSign(0),
  55         mLeadingSpaceSign(0),
  56         mVerticalOffsetSign(0),
  57         mWidthPseudoUnit(0),
  58         mHeightPseudoUnit(0),
  59         mDepthPseudoUnit(0),
  60         mLeadingSpacePseudoUnit(0),
  61         mVerticalOffsetPseudoUnit(0) {}
  62
  63   virtual ~nsMathMLmpaddedFrame();
  64
  65   virtual nsresult MeasureForWidth(DrawTarget* aDrawTarget,
  66                                    ReflowOutput& aDesiredSize) override;
  67
  68  private:
  69   nsCSSValue mWidth;
  70   nsCSSValue mHeight;
  71   nsCSSValue mDepth;
  72   nsCSSValue mLeadingSpace;
  73   nsCSSValue mVerticalOffset;
  74
  75   int32_t mWidthSign;
  76   int32_t mHeightSign;
  77   int32_t mDepthSign;
  78   int32_t mLeadingSpaceSign;
  79   int32_t mVerticalOffsetSign;
  80
  81   int32_t mWidthPseudoUnit;
  82   int32_t mHeightPseudoUnit;
  83   int32_t mDepthPseudoUnit;
  84   int32_t mLeadingSpacePseudoUnit;
  85   int32_t mVerticalOffsetPseudoUnit;
  86
  87   // helpers to process the attributes
  88   void ProcessAttributes();
  89
  90   bool ParseAttribute(nsString& aString, int32_t& aSign, nsCSSValue& aCSSValue,
  91                       int32_t& aPseudoUnit);
  92
  93   void UpdateValue(int32_t aSign, int32_t aPseudoUnit,
  94                    const nsCSSValue& aCSSValue,
  95                    const ReflowOutput& aDesiredSize, nscoord& aValueToUpdate,
  96                    float aFontSizeInflation) const;
  97 };
  98
  99 #endif /* nsMathMLmpaddedFrame_h___ */