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nsMathMLmoFrame.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  *   Shyjan Mahamud <mahamud@cs.cmu.edu>
00025  *
00026  * Alternatively, the contents of this file may be used under the terms of
00027  * either of the GNU General Public License Version 2 or later (the "GPL"),
00028  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00029  * in which case the provisions of the GPL or the LGPL are applicable instead
00030  * of those above. If you wish to allow use of your version of this file only
00031  * under the terms of either the GPL or the LGPL, and not to allow others to
00032  * use your version of this file under the terms of the MPL, indicate your
00033  * decision by deleting the provisions above and replace them with the notice
00034  * and other provisions required by the GPL or the LGPL. If you do not delete
00035  * the provisions above, a recipient may use your version of this file under
00036  * the terms of any one of the MPL, the GPL or the LGPL.
00037  *
00038  * ***** END LICENSE BLOCK ***** */
00039 
00040 #ifndef nsMathMLmoFrame_h___
00041 #define nsMathMLmoFrame_h___
00042 
00043 #include "nsCOMPtr.h"
00044 #include "nsMathMLTokenFrame.h"
00045 
00046 //
00047 // <mo> -- operator, fence, or separator
00048 //
00049 
00050 class nsMathMLmoFrame : public nsMathMLTokenFrame {
00051 public:
00052   friend nsresult NS_NewMathMLmoFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame);
00053 
00054   virtual eMathMLFrameType GetMathMLFrameType();
00055 
00056   virtual void
00057   SetAdditionalStyleContext(PRInt32          aIndex, 
00058                             nsStyleContext*  aStyleContext);
00059   virtual nsStyleContext*
00060   GetAdditionalStyleContext(PRInt32 aIndex) const;
00061 
00062   NS_IMETHOD
00063   Paint(nsPresContext*      aPresContext,
00064         nsIRenderingContext& aRenderingContext,
00065         const nsRect&        aDirtyRect,
00066         nsFramePaintLayer    aWhichLayer,
00067         PRUint32             aFlags = 0);
00068 
00069   NS_IMETHOD
00070   InheritAutomaticData(nsIFrame* aParent);
00071 
00072   NS_IMETHOD
00073   TransmitAutomaticData();
00074 
00075   NS_IMETHOD
00076   Reflow(nsPresContext*          aPresContext,
00077          nsHTMLReflowMetrics&     aDesiredSize,
00078          const nsHTMLReflowState& aReflowState,
00079          nsReflowStatus&          aStatus);
00080 
00081   NS_IMETHOD
00082   ReflowDirtyChild(nsIPresShell* aPresShell,
00083                    nsIFrame*     aChild);
00084 
00085   NS_IMETHOD
00086   AttributeChanged(nsIContent*     aContent,
00087                    PRInt32         aNameSpaceID,
00088                    nsIAtom*        aAttribute,
00089                    PRInt32         aModType);
00090 
00091   // This method is called by the parent frame to ask <mo> 
00092   // to stretch itself.
00093   NS_IMETHOD
00094   Stretch(nsIRenderingContext& aRenderingContext,
00095           nsStretchDirection   aStretchDirection,
00096           nsBoundingMetrics&   aContainerSize,
00097           nsHTMLReflowMetrics& aDesiredStretchSize);
00098 
00099 protected:
00100   nsMathMLmoFrame();
00101   virtual ~nsMathMLmoFrame();
00102   
00103   virtual PRIntn GetSkipSides() const { return 0; }
00104 
00105   nsMathMLChar     mMathMLChar; // Here is the MathMLChar that will deal with the operator.
00106   nsOperatorFlags  mFlags;
00107   float            mMinSize;
00108   float            mMaxSize;
00109 
00110   // overload the base method so that we can setup our nsMathMLChar
00111   virtual void
00112   ProcessTextData(nsPresContext* aPresContext);
00113 
00114   // helper to get our 'form' and lookup in the Operator Dictionary to fetch 
00115   // our default data that may come from there, and to complete the setup
00116   // using attributes that we may have
00117   void
00118   ProcessOperatorData();
00119 
00120   // helper to double check thar our char should be rendered as a selected char
00121   PRBool
00122   IsFrameInSelection(nsIFrame* aFrame);
00123 };
00124 
00125 #endif /* nsMathMLmoFrame_h___ */