gecko-dev/layout/mathml/nsMathMLmspaceFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
* 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
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* 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>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
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#include "nsCOMPtr.h"
#include "nsFrame.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
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#include "nsStyleConsts.h"
#include "nsIRenderingContext.h"
#include "nsIFontMetrics.h"
#include "nsMathMLmspaceFrame.h"
//
// <mspace> -- space - implementation
//
nsIFrame*
NS_NewMathMLmspaceFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
return new (aPresShell) nsMathMLmspaceFrame(aContext);
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}
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmspaceFrame)
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nsMathMLmspaceFrame::~nsMathMLmspaceFrame()
{
}
PRBool
nsMathMLmspaceFrame::IsLeaf() const
{
return PR_TRUE;
}
void
nsMathMLmspaceFrame::ProcessAttributes(nsPresContext* aPresContext)
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{
/*
parse the attributes
width = number h-unit
height = number v-unit
depth = number v-unit
*/
nsAutoString value;
nsCSSValue cssValue;
// width
mWidth = 0;
GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::width,
value);
if (!value.IsEmpty()) {
if ((ParseNumericValue(value, cssValue) ||
ParseNamedSpaceValue(mPresentationData.mstyle, value, cssValue)) &&
cssValue.IsLengthUnit()) {
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mWidth = CalcLength(aPresContext, mStyleContext, cssValue);
}
}
// height
mHeight = 0;
GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::height,
value);
if (!value.IsEmpty()) {
if ((ParseNumericValue(value, cssValue) ||
ParseNamedSpaceValue(mPresentationData.mstyle, value, cssValue)) &&
cssValue.IsLengthUnit()) {
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mHeight = CalcLength(aPresContext, mStyleContext, cssValue);
}
}
// depth
mDepth = 0;
GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::depth_,
value);
if (!value.IsEmpty()) {
if ((ParseNumericValue(value, cssValue) ||
ParseNamedSpaceValue(mPresentationData.mstyle, value, cssValue)) &&
cssValue.IsLengthUnit()) {
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mDepth = CalcLength(aPresContext, mStyleContext, cssValue);
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}
}
}
NS_IMETHODIMP
nsMathMLmspaceFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
ProcessAttributes(aPresContext);
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mBoundingMetrics.Clear();
mBoundingMetrics.width = mWidth;
mBoundingMetrics.ascent = mHeight;
mBoundingMetrics.descent = mDepth;
mBoundingMetrics.leftBearing = 0;
mBoundingMetrics.rightBearing = mWidth;
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aDesiredSize.ascent = mHeight;
aDesiredSize.width = mWidth;
aDesiredSize.height = aDesiredSize.ascent + mDepth;
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// Also return our bounding metrics
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
aStatus = NS_FRAME_COMPLETE;
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
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return NS_OK;
}