gecko-dev/layout/mathml/nsMathMLmencloseFrame.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */


#ifndef nsMathMLmencloseFrame_h___
#define nsMathMLmencloseFrame_h___

#include "mozilla/Attributes.h"
#include "mozilla/EnumSet.h"
#include "nsMathMLContainerFrame.h"

//
// <menclose> -- enclose content with a stretching symbol such
// as a long division sign.
//

/*
  The MathML REC describes:

  The menclose element renders its content inside the enclosing notation
  specified by its notation attribute. menclose accepts any number of arguments;
  if this number is not 1, its contents are treated as a single "inferred mrow"
  containing its arguments, as described in Section 3.1.3 Required Arguments.
*/

enum nsMencloseNotation
  {
    NOTATION_LONGDIV,
    NOTATION_RADICAL,
    NOTATION_ROUNDEDBOX,
    NOTATION_CIRCLE,
    NOTATION_LEFT,
    NOTATION_RIGHT,
    NOTATION_TOP,
    NOTATION_BOTTOM,
    NOTATION_UPDIAGONALSTRIKE,
    NOTATION_DOWNDIAGONALSTRIKE,
    NOTATION_VERTICALSTRIKE,
    NOTATION_HORIZONTALSTRIKE,
    NOTATION_UPDIAGONALARROW,
    NOTATION_PHASORANGLE
  };

class nsMathMLmencloseFrame : public nsMathMLContainerFrame {
public:
  NS_DECL_FRAMEARENA_HELPERS(nsMathMLmencloseFrame)

  friend nsIFrame* NS_NewMathMLmencloseFrame(nsIPresShell*   aPresShell,
                                             nsStyleContext* aContext);

  virtual nsresult
  Place(DrawTarget*          aDrawTarget,
        bool                 aPlaceOrigin,
        ReflowOutput& aDesiredSize) override;

  virtual nsresult
  MeasureForWidth(DrawTarget* aDrawTarget,
                  ReflowOutput& aDesiredSize) override;

  virtual nsresult
  AttributeChanged(int32_t         aNameSpaceID,
                   nsAtom*        aAttribute,
                   int32_t         aModType) override;

  virtual void
  SetAdditionalStyleContext(int32_t          aIndex,
                            nsStyleContext*  aStyleContext) override;
  virtual nsStyleContext*
  GetAdditionalStyleContext(int32_t aIndex) const override;

  virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                const nsDisplayListSet& aLists) override;

  NS_IMETHOD
  InheritAutomaticData(nsIFrame* aParent) override;

  NS_IMETHOD
  TransmitAutomaticData() override;

  virtual nscoord
  FixInterFrameSpacing(ReflowOutput& aDesiredSize) override;

  bool
  IsMrowLike() override {
    return mFrames.FirstChild() != mFrames.LastChild() ||
           !mFrames.FirstChild();
  }

protected:
  explicit nsMathMLmencloseFrame(nsStyleContext* aContext, ClassID aID = kClassID);
  virtual ~nsMathMLmencloseFrame();

  nsresult PlaceInternal(DrawTarget*          aDrawTarget,
                         bool                 aPlaceOrigin,
                         ReflowOutput& aDesiredSize,
                         bool                 aWidthOnly);

  // functions to parse the "notation" attribute.
  nsresult AddNotation(const nsAString& aNotation);
  void InitNotations();

  // Description of the notations to draw
  mozilla::EnumSet<nsMencloseNotation> mNotationsToDraw;
  bool IsToDraw(nsMencloseNotation notation)
  {
    return mNotationsToDraw.contains(notation);
  }

  nscoord mRuleThickness;
  nscoord mRadicalRuleThickness;
  nsTArray<nsMathMLChar> mMathMLChar;
  int8_t mLongDivCharIndex, mRadicalCharIndex;
  nscoord mContentWidth;
  nsresult AllocateMathMLChar(nsMencloseNotation mask);

  // Display a frame of the specified type.
  // @param aType Type of frame to display
  void DisplayNotation(nsDisplayListBuilder* aBuilder,
                       nsIFrame* aFrame, const nsRect& aRect,
                       const nsDisplayListSet& aLists,
                       nscoord aThickness, nsMencloseNotation aType);
};

#endif /* nsMathMLmencloseFrame_h___ */