gecko-dev/layout/mathml/nsMathMLmrowFrame.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */


#include "nsCOMPtr.h"
#include "nsFrame.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.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;

  if (mContent->Tag() == nsGkAtoms::mrow_) {
    // see if the directionality attribute is there
    nsMathMLFrame::FindAttrDirectionality(mContent, mPresentationData);
  }

  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->GetFirstPrincipalChild()) {
      // 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);
}