layout/mathml/base/src/nsMathMLForeignFrameWrapper.cpp

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   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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  15  * The Original Code is Mozilla MathML Project.
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  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.
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  22  * Contributor(s):
  23  *   Roger B. Sidje <rbs@maths.uq.edu.au>
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  25  * Alternatively, the contents of this file may be used under the terms of
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  38
  39 //
  40 // a helper frame class to wrap non-MathML frames so that foreign elements
  41 // (e.g., html:img) can mix better with other surrounding MathML markups
  42 //
  43
  44 #include "nsCOMPtr.h"
  45 #include "nsHTMLParts.h"
  46 #include "nsFrame.h"
  47 #include "nsAreaFrame.h"
  48 #include "nsLineLayout.h"
  49 #include "nsPresContext.h"
  50 #include "nsStyleContext.h"
  51 #include "nsStyleConsts.h"
  52 #include "nsIRenderingContext.h"
  53 #include "nsIFontMetrics.h"
  54
  55 #include "nsMathMLForeignFrameWrapper.h"
  56
  57 NS_IMPL_ADDREF_INHERITED(nsMathMLForeignFrameWrapper, nsMathMLFrame)
  58 NS_IMPL_RELEASE_INHERITED(nsMathMLForeignFrameWrapper, nsMathMLFrame)
  59 NS_IMPL_QUERY_INTERFACE_INHERITED1(nsMathMLForeignFrameWrapper, nsBlockFrame, nsMathMLFrame)
  60
  61 nsIFrame*
  62 NS_NewMathMLForeignFrameWrapper(nsIPresShell* aPresShell, nsStyleContext* aContext)
  63 {
  64   return new (aPresShell) nsMathMLForeignFrameWrapper(aContext);
  65 }
  66
  67 NS_IMETHODIMP
  68 nsMathMLForeignFrameWrapper::Reflow(nsPresContext*          aPresContext,
  69                                     nsHTMLReflowMetrics&     aDesiredSize,
  70                                     const nsHTMLReflowState& aReflowState,
  71                                     nsReflowStatus&          aStatus)
  72 {
  73   // Let the base class do the reflow
  74   nsresult rv = nsBlockFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
  75
  76   mReference.x = 0;
  77   mReference.y = aDesiredSize.ascent;
  78
  79   // just make-up a bounding metrics
  80   mBoundingMetrics.Clear();
  81   mBoundingMetrics.ascent = aDesiredSize.ascent;
  82   mBoundingMetrics.descent = aDesiredSize.height - aDesiredSize.ascent;
  83   mBoundingMetrics.width = aDesiredSize.width;
  84   mBoundingMetrics.leftBearing = 0;
  85   mBoundingMetrics.rightBearing = aDesiredSize.width;
  86   aDesiredSize.mBoundingMetrics = mBoundingMetrics;
  87
  88   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
  89   return rv;
  90 }