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nsMathMLmfencedFrame.h
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00001 /* ***** BEGIN LICENSE BLOCK *****
00002  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00003  *
00004  * The contents of this file are subject to the Mozilla Public License Version
00005  * 1.1 (the "License"); you may not use this file except in compliance with
00006  * the License. You may obtain a copy of the License at
00007  * http://www.mozilla.org/MPL/
00008  *
00009  * Software distributed under the License is distributed on an "AS IS" basis,
00010  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00011  * for the specific language governing rights and limitations under the
00012  * License.
00013  *
00014  * The Original Code is Mozilla MathML Project.
00015  *
00016  * The Initial Developer of the Original Code is
00017  * The University Of Queensland.
00018  * Portions created by the Initial Developer are Copyright (C) 1999
00019  * the Initial Developer. All Rights Reserved.
00020  *
00021  * Contributor(s):
00022  *   Roger B. Sidje <rbs@maths.uq.edu.au>
00023  *   David J. Fiddes <D.J.Fiddes@hw.ac.uk>
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either of the GNU General Public License Version 2 or later (the "GPL"),
00027  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
00030  * under the terms of either the GPL or the LGPL, and not to allow others to
00031  * use your version of this file under the terms of the MPL, indicate your
00032  * decision by deleting the provisions above and replace them with the notice
00033  * and other provisions required by the GPL or the LGPL. If you do not delete
00034  * the provisions above, a recipient may use your version of this file under
00035  * the terms of any one of the MPL, the GPL or the LGPL.
00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #ifndef nsMathMLmfencedFrame_h___
00040 #define nsMathMLmfencedFrame_h___
00041 
00042 #include "nsCOMPtr.h"
00043 #include "nsMathMLContainerFrame.h"
00044 
00045 //
00046 // <mfenced> -- surround content with a pair of fences
00047 //
00048 
00049 class nsMathMLmfencedFrame : public nsMathMLContainerFrame {
00050 public:
00051   friend nsresult NS_NewMathMLmfencedFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame);
00052 
00053   virtual void
00054   SetAdditionalStyleContext(PRInt32          aIndex, 
00055                             nsStyleContext*  aStyleContext);
00056   virtual nsStyleContext*
00057   GetAdditionalStyleContext(PRInt32 aIndex) const;
00058 
00059   NS_IMETHOD
00060   InheritAutomaticData(nsIFrame* aParent);
00061 
00062   NS_IMETHOD
00063   SetInitialChildList(nsPresContext* aPresContext,
00064                       nsIAtom*        aListName,
00065                       nsIFrame*       aChildList);
00066 
00067   NS_IMETHOD
00068   Reflow(nsPresContext*          aPresContext,
00069          nsHTMLReflowMetrics&     aDesiredSize,
00070          const nsHTMLReflowState& aReflowState,
00071          nsReflowStatus&          aStatus);
00072 
00073   NS_IMETHOD 
00074   Paint(nsPresContext*      aPresContext,
00075         nsIRenderingContext& aRenderingContext,
00076         const nsRect&        aDirtyRect,
00077         nsFramePaintLayer    aWhichLayer,
00078         PRUint32             aFlags = 0);
00079 
00080   NS_IMETHOD
00081   AttributeChanged(nsIContent*     aContent,
00082                    PRInt32         aNameSpaceID,
00083                    nsIAtom*        aAttribute,
00084                    PRInt32         aModType);
00085 
00086   // override the base method because we must keep separators in sync
00087   virtual nsresult
00088   ChildListChanged(PRInt32 aModType);
00089 
00090   // override the base method so that we can deal with fences and separators
00091   virtual nscoord
00092   FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize);
00093 
00094   // exported routine that both mfenced and mfrac share.
00095   // mfrac uses this when its bevelled attribute is set.
00096   static nsresult
00097   doReflow(nsPresContext*          aPresContext,
00098            const nsHTMLReflowState& aReflowState,
00099            nsHTMLReflowMetrics&     aDesiredSize,
00100            nsReflowStatus&          aStatus,
00101            nsIFrame*                aForFrame,
00102            nsMathMLChar*            aOpenChar,
00103            nsMathMLChar*            aCloseChar,
00104            nsMathMLChar*            aSeparatorsChar,
00105            PRInt32                  aSeparatorsCount);
00106 
00107   // helper routines to format the MathMLChars involved here
00108   static nsresult
00109   ReflowChar(nsPresContext*      aPresContext,
00110              nsIRenderingContext& aRenderingContext,
00111              nsMathMLChar*        aMathMLChar,
00112              nsOperatorFlags      aForm,
00113              PRInt32              aScriptLevel,
00114              nscoord              axisHeight,
00115              nscoord              leading,
00116              nscoord              em,
00117              nsBoundingMetrics&   aContainerSize,
00118              nsHTMLReflowMetrics& aDesiredSize);
00119 
00120   static void
00121   PlaceChar(nsMathMLChar*      aMathMLChar,
00122             nscoord            aDesiredSize,
00123             nsBoundingMetrics& bm,
00124             nscoord&           dx);
00125 
00126 protected:
00127   nsMathMLmfencedFrame();
00128   virtual ~nsMathMLmfencedFrame();
00129   
00130   virtual PRIntn GetSkipSides() const { return 0; }
00131 
00132   nsMathMLChar* mOpenChar;
00133   nsMathMLChar* mCloseChar;
00134   nsMathMLChar* mSeparatorsChar;
00135   PRInt32       mSeparatorsCount;
00136 
00137   // clean up
00138   void
00139   RemoveFencesAndSeparators();
00140 
00141   // add fences and separators when all child frames are known
00142   nsresult
00143   CreateFencesAndSeparators(nsPresContext* aPresContext);
00144 };
00145 
00146 #endif /* nsMathMLmfencedFrame_h___ */