gecko-dev/layout/mathml/nsMathMLmrowFrame.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "nsMathMLmrowFrame.h"
#include "mozilla/gfx/2D.h"

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

nsIFrame*
NS_NewMathMLmrowFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle)
{
  return new (aPresShell) nsMathMLmrowFrame(aStyle);
}

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;
}

nsresult
nsMathMLmrowFrame::AttributeChanged(int32_t  aNameSpaceID,
                                    nsAtom* aAttribute,
                                    int32_t  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->IsMathMLElement(nsGkAtoms::mtable_)) {
    nsIFrame* frame = mFrames.FirstChild();
    for ( ; frame; frame = frame->PrincipalChildList().FirstChild()) {
      // drill down to the real mtable
      if (frame->IsTableWrapperFrame())
        return frame->AttributeChanged(aNameSpaceID, aAttribute, aModType);
    }
    MOZ_ASSERT_UNREACHABLE("mtable wrapper without the real table frame");
  }

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

/* virtual */ eMathMLFrameType
nsMathMLmrowFrame::GetMathMLFrameType()
{
  if (!IsMrowLike()) {
    nsIMathMLFrame* child = do_QueryFrame(mFrames.FirstChild());
    if (child) {
      // We only have one child, so we return the frame type of that child as if
      // we didn't exist.
      return child->GetMathMLFrameType();
    }
  }
  return nsMathMLFrame::GetMathMLFrameType();
}