gecko/layout/mathml/nsMathMLmrowFrame.cpp

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 * for the specific language governing rights and limitations under the
 * License.
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 * The Original Code is Mozilla MathML Project.
 *
 * The Initial Developer of the Original Code is
 * The University Of Queensland.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Roger B. Sidje <rbs@maths.uq.edu.au>
 *   David J. Fiddes <D.J.Fiddes@hw.ac.uk>
 *
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#include "nsCOMPtr.h"
#include "nsFrame.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIRenderingContext.h"
#include "nsIFontMetrics.h"

#include "nsMathMLmrowFrame.h"

//
// <mrow> -- horizontally group any number of subexpressions - implementation
//

nsIFrame*
NS_NewMathMLmrowFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsMathMLmrowFrame(aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmrowFrame)

nsMathMLmrowFrame::~nsMathMLmrowFrame()
{
}

NS_IMETHODIMP
nsMathMLmrowFrame::InheritAutomaticData(nsIFrame* aParent)
{
  // let the base class get the default from our parent
  nsMathMLContainerFrame::InheritAutomaticData(aParent);

  mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;

  return NS_OK;
}

NS_IMETHODIMP
nsMathMLmrowFrame::AttributeChanged(PRInt32  aNameSpaceID,
                                    nsIAtom* aAttribute,
                                    PRInt32  aModType)
{
  // Special for <mtable>: In the frame construction code, we also use
  // this frame class as a wrapper for mtable. Hence, we should pass the
  // notification to the real mtable
  if (mContent->Tag() == nsGkAtoms::mtable_) {
    nsIFrame* frame = mFrames.FirstChild();
    for ( ; frame; frame = frame->GetFirstChild(nsnull)) {
      // drill down to the real mtable
      if (frame->GetType() == nsGkAtoms::tableOuterFrame)
        return frame->AttributeChanged(aNameSpaceID, aAttribute, aModType);
    }
    NS_NOTREACHED("mtable wrapper without the real table frame");
  }

  return nsMathMLContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
}