layout/mathml/base/src/nsMathMLmrowFrame.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
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  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is Mozilla MathML Project.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * The University Of Queensland.
  19  * Portions created by the Initial Developer are Copyright (C) 1999
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *   Roger B. Sidje <rbs@maths.uq.edu.au>
  24  *   David J. Fiddes <D.J.Fiddes@hw.ac.uk>
  25  *
  26  * Alternatively, the contents of this file may be used under the terms of
  27  * either of the GNU General Public License Version 2 or later (the "GPL"),
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  38  * ***** END LICENSE BLOCK ***** */
  39
  40
  41 #include "nsCOMPtr.h"
  42 #include "nsFrame.h"
  43 #include "nsPresContext.h"
  44 #include "nsStyleContext.h"
  45 #include "nsStyleConsts.h"
  46 #include "nsIRenderingContext.h"
  47 #include "nsIFontMetrics.h"
  48
  49 #include "nsMathMLmrowFrame.h"
  50
  51 //
  52 // <mrow> -- horizontally group any number of subexpressions - implementation
  53 //
  54
  55 nsIFrame*
  56 NS_NewMathMLmrowFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
  57 {
  58   return new (aPresShell) nsMathMLmrowFrame(aContext);
  59 }
  60
  61 nsMathMLmrowFrame::~nsMathMLmrowFrame()
  62 {
  63 }
  64
  65 NS_IMETHODIMP
  66 nsMathMLmrowFrame::InheritAutomaticData(nsIFrame* aParent)
  67 {
  68   // let the base class get the default from our parent
  69   nsMathMLContainerFrame::InheritAutomaticData(aParent);
  70
  71   mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
  72
  73   return NS_OK;
  74 }
  75
  76 NS_IMETHODIMP
  77 nsMathMLmrowFrame::AttributeChanged(PRInt32  aNameSpaceID,
  78                                     nsIAtom* aAttribute,
  79                                     PRInt32  aModType)
  80 {
  81   // Special for <mtable>: In the frame construction code, we also use
  82   // this frame class as a wrapper for mtable. Hence, we should pass the
  83   // notification to the real mtable
  84   if (mContent->Tag() == nsGkAtoms::mtable_) {
  85     nsIFrame* frame = mFrames.FirstChild();
  86     for ( ; frame; frame = frame->GetFirstChild(nsnull)) {
  87       // drill down to the real mtable
  88       if (frame->GetType() == nsGkAtoms::tableOuterFrame)
  89         return frame->AttributeChanged(aNameSpaceID, aAttribute, aModType);
  90     }
  91     NS_NOTREACHED("mtable wrapper without the real table frame");
  92   }
  93
  94   return nsMathMLContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
  95 }