layout/mathml/nsMathMLmspaceFrame.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   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/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is Mozilla MathML Project.
  16  *
  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.
  21  *
  22  * Contributor(s):
  23  *   Roger B. Sidje <rbs@maths.uq.edu.au>
  24  *
  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either of the GNU General Public License Version 2 or later (the "GPL"),
  27  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28  * in which case the provisions of the GPL or the LGPL are applicable instead
  29  * of those above. If you wish to allow use of your version of this file only
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  34  * the provisions above, a recipient may use your version of this file under
  35  * the terms of any one of the MPL, the GPL or the LGPL.
  36  *
  37  * ***** END LICENSE BLOCK ***** */
  38
  39
  40 #include "nsCOMPtr.h"
  41 #include "nsFrame.h"
  42 #include "nsPresContext.h"
  43 #include "nsStyleContext.h"
  44 #include "nsStyleConsts.h"
  45 #include "nsIRenderingContext.h"
  46 #include "nsIFontMetrics.h"
  47
  48 #include "nsMathMLmspaceFrame.h"
  49
  50
  51 //
  52 // <mspace> -- space - implementation
  53 //
  54
  55 nsIFrame*
  56 NS_NewMathMLmspaceFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
  57 {
  58   return new (aPresShell) nsMathMLmspaceFrame(aContext);
  59 }
  60
  61 NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmspaceFrame)
  62
  63 nsMathMLmspaceFrame::~nsMathMLmspaceFrame()
  64 {
  65 }
  66
  67 PRBool
  68 nsMathMLmspaceFrame::IsLeaf() const
  69 {
  70   return PR_TRUE;
  71 }
  72
  73 void
  74 nsMathMLmspaceFrame::ProcessAttributes(nsPresContext* aPresContext)
  75 {
  76   /*
  77   parse the attributes
  78
  79   width  = number h-unit
  80   height = number v-unit
  81   depth  = number v-unit
  82   */
  83
  84   nsAutoString value;
  85   nsCSSValue cssValue;
  86
  87   // width
  88   mWidth = 0;
  89   GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::width,
  90                value);
  91   if (!value.IsEmpty()) {
  92     if ((ParseNumericValue(value, cssValue) ||
  93          ParseNamedSpaceValue(mPresentationData.mstyle, value, cssValue)) &&
  94          cssValue.IsLengthUnit()) {
  95       mWidth = CalcLength(aPresContext, mStyleContext, cssValue);
  96     }
  97   }
  98
  99   // height
 100   mHeight = 0;
 101   GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::height,
 102                value);
 103   if (!value.IsEmpty()) {
 104     if ((ParseNumericValue(value, cssValue) ||
 105          ParseNamedSpaceValue(mPresentationData.mstyle, value, cssValue)) &&
 106          cssValue.IsLengthUnit()) {
 107       mHeight = CalcLength(aPresContext, mStyleContext, cssValue);
 108     }
 109   }
 110
 111   // depth
 112   mDepth = 0;
 113   GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::depth_,
 114                value);
 115   if (!value.IsEmpty()) {
 116     if ((ParseNumericValue(value, cssValue) ||
 117          ParseNamedSpaceValue(mPresentationData.mstyle, value, cssValue)) &&
 118          cssValue.IsLengthUnit()) {
 119       mDepth = CalcLength(aPresContext, mStyleContext, cssValue);
 120     }
 121   }
 122 }
 123
 124 NS_IMETHODIMP
 125 nsMathMLmspaceFrame::Reflow(nsPresContext*          aPresContext,
 126                             nsHTMLReflowMetrics&     aDesiredSize,
 127                             const nsHTMLReflowState& aReflowState,
 128                             nsReflowStatus&          aStatus)
 129 {
 130   ProcessAttributes(aPresContext);
 131
 132   mBoundingMetrics.Clear();
 133   mBoundingMetrics.width = mWidth;
 134   mBoundingMetrics.ascent = mHeight;
 135   mBoundingMetrics.descent = mDepth;
 136   mBoundingMetrics.leftBearing = 0;
 137   mBoundingMetrics.rightBearing = mWidth;
 138
 139   aDesiredSize.ascent = mHeight;
 140   aDesiredSize.width = mWidth;
 141   aDesiredSize.height = aDesiredSize.ascent + mDepth;
 142   // Also return our bounding metrics
 143   aDesiredSize.mBoundingMetrics = mBoundingMetrics;
 144
 145   aStatus = NS_FRAME_COMPLETE;
 146   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
 147   return NS_OK;
 148 }