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nsMathMLmencloseFrame.h (3303B)

      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 nsMathMLmencloseFrame_h___
      8 #define nsMathMLmencloseFrame_h___
      9 
     10 #include "mozilla/EnumSet.h"
     11 #include "nsMathMLChar.h"
     12 #include "nsMathMLContainerFrame.h"
     13 
     14 namespace mozilla {
     15 class PresShell;
     16 }  // namespace mozilla
     17 
     18 //
     19 // <menclose> -- enclose content with a stretching symbol such
     20 // as a long division sign.
     21 //
     22 
     23 /*
     24  The MathML REC describes:
     25 
     26  The menclose element renders its content inside the enclosing notation
     27  specified by its notation attribute. menclose accepts any number of arguments;
     28  if this number is not 1, its contents are treated as a single "inferred mrow"
     29  containing its arguments, as described in Section 3.1.3 Required Arguments.
     30 */
     31 
     32 enum nsMencloseNotation {
     33  NOTATION_LONGDIV,
     34  NOTATION_ROUNDEDBOX,
     35  NOTATION_CIRCLE,
     36  NOTATION_LEFT,
     37  NOTATION_RIGHT,
     38  NOTATION_TOP,
     39  NOTATION_BOTTOM,
     40  NOTATION_UPDIAGONALSTRIKE,
     41  NOTATION_DOWNDIAGONALSTRIKE,
     42  NOTATION_VERTICALSTRIKE,
     43  NOTATION_HORIZONTALSTRIKE,
     44  NOTATION_UPDIAGONALARROW,
     45  NOTATION_PHASORANGLE
     46 };
     47 
     48 class nsMathMLmencloseFrame : public nsMathMLContainerFrame {
     49 public:
     50  NS_DECL_FRAMEARENA_HELPERS(nsMathMLmencloseFrame)
     51 
     52  friend nsIFrame* NS_NewMathMLmencloseFrame(mozilla::PresShell* aPresShell,
     53                                             ComputedStyle* aStyle);
     54 
     55  void Place(DrawTarget* aDrawTarget, const PlaceFlags& aFlags,
     56             ReflowOutput& aDesiredSize) override;
     57 
     58  nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
     59                            AttrModType aModType) override;
     60 
     61  void DidSetComputedStyle(ComputedStyle* aOldStyle) override;
     62 
     63  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
     64                        const nsDisplayListSet& aLists) override;
     65 
     66  NS_IMETHOD
     67  InheritAutomaticData(nsIFrame* aParent) override;
     68 
     69  nscoord FixInterFrameSpacing(ReflowOutput& aDesiredSize) override;
     70 
     71  bool IsMrowLike() override {
     72    return mFrames.FirstChild() != mFrames.LastChild() || !mFrames.FirstChild();
     73  }
     74 
     75 protected:
     76  explicit nsMathMLmencloseFrame(ComputedStyle* aStyle,
     77                                 nsPresContext* aPresContext);
     78  virtual ~nsMathMLmencloseFrame();
     79 
     80  // functions to parse the "notation" attribute.
     81  nsresult AddNotation(const nsAString& aNotation);
     82  void InitNotations();
     83 
     84  // Description of the notations to draw
     85  mozilla::EnumSet<nsMencloseNotation> mNotationsToDraw;
     86  bool IsToDraw(nsMencloseNotation notation) {
     87    return mNotationsToDraw.contains(notation);
     88  }
     89 
     90  nscoord mRuleThickness;
     91  nsTArray<nsMathMLChar> mMathMLChar;
     92  int8_t mLongDivCharIndex;
     93  nscoord mContentWidth;
     94  nsresult AllocateMathMLChar(nsMencloseNotation mask);
     95 
     96  // Display a frame of the specified type.
     97  // @param aType Type of frame to display
     98  void DisplayNotation(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
     99                       const nsRect& aRect, const nsDisplayListSet& aLists,
    100                       nscoord aThickness, nsMencloseNotation aType);
    101 };
    102 
    103 #endif /* nsMathMLmencloseFrame_h___ */