gecko/layout/mathml/nsMathMLForeignFrameWrapper.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
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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.
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 * Contributor(s):
 *   Roger B. Sidje <rbs@maths.uq.edu.au>
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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//
// a helper frame class to wrap non-MathML frames so that foreign elements 
// (e.g., html:img) can mix better with other surrounding MathML markups
//

#include "nsCOMPtr.h"
#include "nsHTMLParts.h"
#include "nsFrame.h"
#include "nsBlockFrame.h"
#include "nsLineLayout.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIRenderingContext.h"
#include "nsIFontMetrics.h"

#include "nsMathMLForeignFrameWrapper.h"

NS_QUERYFRAME_HEAD(nsMathMLForeignFrameWrapper)
  NS_QUERYFRAME_ENTRY(nsMathMLFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsBlockFrame)

nsIFrame*
NS_NewMathMLForeignFrameWrapper(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsMathMLForeignFrameWrapper(aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsMathMLForeignFrameWrapper)

NS_IMETHODIMP
nsMathMLForeignFrameWrapper::Reflow(nsPresContext*          aPresContext,
                                    nsHTMLReflowMetrics&     aDesiredSize,
                                    const nsHTMLReflowState& aReflowState,
                                    nsReflowStatus&          aStatus)
{
  // Let the base class do the reflow
  nsresult rv = nsBlockFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);

  mReference.x = 0;
  mReference.y = aDesiredSize.ascent;

  // just make-up a bounding metrics
  mBoundingMetrics.Clear();
  mBoundingMetrics.ascent = aDesiredSize.ascent;
  mBoundingMetrics.descent = aDesiredSize.height - aDesiredSize.ascent;
  mBoundingMetrics.width = aDesiredSize.width;
  mBoundingMetrics.leftBearing = 0;
  mBoundingMetrics.rightBearing = aDesiredSize.width;
  aDesiredSize.mBoundingMetrics = mBoundingMetrics;

  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
  return rv;
}