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nsMathMLmpaddedFrame.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 nsMathMLmpaddedFrame_h___
00040 #define nsMathMLmpaddedFrame_h___
00041 
00042 #include "nsCOMPtr.h"
00043 #include "nsMathMLContainerFrame.h"
00044 
00045 //
00046 // <mpadded> -- adjust space around content  
00047 //
00048 
00049 class nsMathMLmpaddedFrame : public nsMathMLContainerFrame {
00050 public:
00051   friend nsresult NS_NewMathMLmpaddedFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame);
00052 
00053   NS_IMETHOD
00054   InheritAutomaticData(nsIFrame* aParent);
00055 
00056   NS_IMETHOD
00057   Reflow(nsPresContext*          aPresContext,
00058          nsHTMLReflowMetrics&     aDesiredSize,
00059          const nsHTMLReflowState& aReflowState,
00060          nsReflowStatus&          aStatus);
00061   
00062 protected:
00063   nsMathMLmpaddedFrame();
00064   virtual ~nsMathMLmpaddedFrame();
00065   
00066   virtual PRIntn GetSkipSides() const { return 0; }
00067 
00068 private:
00069   nsCSSValue mWidth;
00070   nsCSSValue mHeight;
00071   nsCSSValue mDepth;
00072   nsCSSValue mLeftSpace;
00073 
00074   PRInt32    mWidthSign;
00075   PRInt32    mHeightSign;
00076   PRInt32    mDepthSign;
00077   PRInt32    mLeftSpaceSign;
00078 
00079   PRInt32    mWidthPseudoUnit;
00080   PRInt32    mHeightPseudoUnit;
00081   PRInt32    mDepthPseudoUnit;
00082   PRInt32    mLeftSpacePseudoUnit;
00083 
00084   // helpers to process the attributes
00085   void
00086   ProcessAttributes();
00087 
00088   static PRBool
00089   ParseAttribute(nsString&   aString,
00090                  PRInt32&    aSign,
00091                  nsCSSValue& aCSSValue,
00092                  PRInt32&    aPseudoUnit);
00093 
00094   static void
00095   UpdateValue(nsPresContext*      aPresContext,
00096               nsStyleContext*      aStyleContext,
00097               PRInt32              aSign,
00098               PRInt32              aPseudoUnit,
00099               nsCSSValue&          aCSSValue,
00100               nscoord              aLeftSpace,
00101               nsBoundingMetrics&   aBoundingMetrics,
00102               nscoord&             aValueToUpdate);
00103 };
00104 
00105 #endif /* nsMathMLmpaddedFrame_h___ */