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lightning-sunbird  0.9+nobinonly
nsMathMLmphantomFrame.cpp
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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 
00040 #include "nsCOMPtr.h"
00041 #include "nsFrame.h"
00042 #include "nsPresContext.h"
00043 #include "nsUnitConversion.h"
00044 #include "nsStyleConsts.h"
00045 #include "nsIRenderingContext.h"
00046 #include "nsIFontMetrics.h"
00047 
00048 #include "nsMathMLmphantomFrame.h"
00049 
00050 //
00051 // <mphantom> -- make content invisible but preserve its size
00052 //
00053 
00054 nsresult
00055 NS_NewMathMLmphantomFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
00056 {
00057   NS_PRECONDITION(aNewFrame, "null OUT ptr");
00058   if (nsnull == aNewFrame) {
00059     return NS_ERROR_NULL_POINTER;
00060   }
00061   nsMathMLmphantomFrame* it = new (aPresShell) nsMathMLmphantomFrame;
00062   if (nsnull == it) {
00063     return NS_ERROR_OUT_OF_MEMORY;
00064   }
00065   *aNewFrame = it;
00066   return NS_OK;
00067 }
00068 
00069 nsMathMLmphantomFrame::nsMathMLmphantomFrame()
00070 {
00071 }
00072 
00073 nsMathMLmphantomFrame::~nsMathMLmphantomFrame()
00074 {
00075 }
00076 
00077 NS_IMETHODIMP
00078 nsMathMLmphantomFrame::InheritAutomaticData(nsIFrame* aParent)
00079 {
00080   // let the base class get the default from our parent
00081   nsMathMLContainerFrame::InheritAutomaticData(aParent);
00082 
00083   mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
00084 
00085   return NS_OK;
00086 }
00087 
00088 NS_METHOD
00089 nsMathMLmphantomFrame::Paint(nsPresContext*      aPresContext,
00090                              nsIRenderingContext& aRenderingContext,
00091                              const nsRect&        aDirtyRect,
00092                              nsFramePaintLayer    aWhichLayer,
00093                              PRUint32             aFlags)
00094 {
00095   // do nothing, this is not a bug.
00096   return NS_OK;
00097 }