layout/mathml/nsMathMLmspaceFrame.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 nsMathMLmspaceFrame_h___
   8 #define nsMathMLmspaceFrame_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 // <mspace> -- space
  20 //
  21
  22 class nsMathMLmspaceFrame final : public nsMathMLContainerFrame {
  23  public:
  24   NS_DECL_FRAMEARENA_HELPERS(nsMathMLmspaceFrame)
  25
  26   friend nsIFrame* NS_NewMathMLmspaceFrame(mozilla::PresShell* aPresShell,
  27                                            ComputedStyle* aStyle);
  28
  29   NS_IMETHOD
  30   TransmitAutomaticData() override {
  31     // The REC defines the following elements to be space-like:
  32     // * an mtext, mspace, maligngroup, or malignmark element;
  33     mPresentationData.flags |= NS_MATHML_SPACE_LIKE;
  34     return NS_OK;
  35   }
  36
  37  protected:
  38   explicit nsMathMLmspaceFrame(ComputedStyle* aStyle,
  39                                nsPresContext* aPresContext)
  40       : nsMathMLContainerFrame(aStyle, aPresContext, kClassID) {}
  41   virtual ~nsMathMLmspaceFrame();
  42
  43  private:
  44   struct Attribute {
  45     nsCSSValue mValue;
  46     enum class ParsingState : uint8_t {
  47       Valid,
  48       Invalid,
  49       Dirty,
  50     };
  51     ParsingState mState = ParsingState::Dirty;
  52   };
  53   Attribute mWidth;
  54   Attribute mHeight;
  55   Attribute mDepth;
  56
  57   nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
  58                             int32_t aModType) final;
  59   nscoord CalculateAttributeValue(nsAtom* aAtom, Attribute& aAttribute,
  60                                   uint32_t aFlags, float aFontSizeInflation);
  61   nsresult Place(DrawTarget* aDrawTarget, const PlaceFlags& aFlags,
  62                  ReflowOutput& aDesiredSize) final;
  63 };
  64
  65 #endif /* nsMathMLmspaceFrame_h___ */