gecko/layout/mathml/nsMathMLmencloseFrame.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla MathML Project.
 *
 * The Initial Developer of the Original Code is
 * The University Of Queensland.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Roger B. Sidje <rbs@maths.uq.edu.au>
 *   David J. Fiddes <D.J.Fiddes@hw.ac.uk>
 *   Vilya Harvey <vilya@nag.co.uk>
 *   Shyjan Mahamud <mahamud@cs.cmu.edu>
 *   Frederic Wang <fred.wang@free.fr> - extension of <msqrt/> to <menclose/>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */


#ifndef nsMathMLmencloseFrame_h___
#define nsMathMLmencloseFrame_h___

#include "nsCOMPtr.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 = 0x1,
    NOTATION_RADICAL = 0x2,
    NOTATION_ROUNDEDBOX = 0x4,
    NOTATION_CIRCLE = 0x8,
    NOTATION_LEFT = 0x10,
    NOTATION_RIGHT = 0x20,
    NOTATION_TOP = 0x40,
    NOTATION_BOTTOM = 0x80,
    NOTATION_UPDIAGONALSTRIKE = 0x100,
    NOTATION_DOWNDIAGONALSTRIKE = 0x200,
    NOTATION_VERTICALSTRIKE = 0x400,
    NOTATION_HORIZONTALSTRIKE = 0x800
    // NOTATION_MADRUWB = 0x1000
  };

class nsMathMLmencloseFrame : public nsMathMLContainerFrame {
public:
  NS_DECL_FRAMEARENA_HELPERS

  friend nsIFrame* NS_NewMathMLmencloseFrame(nsIPresShell*   aPresShell,
                                             nsStyleContext* aContext);
  
  virtual nsresult
  Place(nsIRenderingContext& aRenderingContext,
        PRBool               aPlaceOrigin,
        nsHTMLReflowMetrics& aDesiredSize);
  
  virtual nsresult
  MeasureForWidth(nsIRenderingContext& aRenderingContext,
                  nsHTMLReflowMetrics& aDesiredSize);
  
  NS_IMETHOD
  AttributeChanged(PRInt32         aNameSpaceID,
                   nsIAtom*        aAttribute,
                   PRInt32         aModType);
  
  virtual void
  SetAdditionalStyleContext(PRInt32          aIndex, 
                            nsStyleContext*  aStyleContext);
  virtual nsStyleContext*
  GetAdditionalStyleContext(PRInt32 aIndex) const;

  NS_IMETHOD
  Init(nsIContent* aContent,
       nsIFrame*   aParent,
       nsIFrame*   aPrevInFlow);

  NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                              const nsRect&           aDirtyRect,
                              const nsDisplayListSet& aLists);

  NS_IMETHOD
  InheritAutomaticData(nsIFrame* aParent);

  NS_IMETHOD
  TransmitAutomaticData();

  virtual nscoord
  FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize);

protected:
  nsMathMLmencloseFrame(nsStyleContext* aContext);
  virtual ~nsMathMLmencloseFrame();

  nsresult PlaceInternal(nsIRenderingContext& aRenderingContext,
                         PRBool               aPlaceOrigin,
                         nsHTMLReflowMetrics& aDesiredSize,
                         PRBool               aWidthOnly);
  
  // functions to parse the "notation" attribute.
  nsresult AddNotation(const nsAString& aNotation);
  void InitNotations();

  // Description of the notations to draw
  PRUint32 mNotationsToDraw;
  PRBool IsToDraw(nsMencloseNotation mask)
  {
    return mask & mNotationsToDraw;
  }

  nscoord mRuleThickness;
  nsTArray<nsMathMLChar> mMathMLChar;
  PRInt8 mLongDivCharIndex, mRadicalCharIndex;
  nscoord mContentWidth;
  nsresult AllocateMathMLChar(nsMencloseNotation mask);

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

#endif /* nsMathMLmencloseFrame_h___ */