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140 lines
3.9 KiB
C++
140 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsCOMPtr.h"
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#include "nsFrame.h"
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#include "nsPresContext.h"
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#include "nsStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsMathMLmspaceFrame.h"
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//
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// <mspace> -- space - implementation
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//
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nsIFrame*
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NS_NewMathMLmspaceFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsMathMLmspaceFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmspaceFrame)
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nsMathMLmspaceFrame::~nsMathMLmspaceFrame()
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{
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}
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bool
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nsMathMLmspaceFrame::IsLeaf() const
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{
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return true;
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}
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void
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nsMathMLmspaceFrame::ProcessAttributes(nsPresContext* aPresContext)
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{
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nsAutoString value;
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// width
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//
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// "Specifies the desired width of the space."
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//
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// values: length
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// default: 0em
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//
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// The default value is "0em", so unitless values can be ignored.
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// <mspace/> is listed among MathML elements allowing negative spacing and
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// the MathML test suite contains "Presentation/TokenElements/mspace/mspace2"
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// as an example. Hence we allow negative values.
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//
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mWidth = 0;
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GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::width,
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value);
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if (!value.IsEmpty()) {
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ParseNumericValue(value, &mWidth,
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nsMathMLElement::PARSE_ALLOW_NEGATIVE,
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aPresContext, mStyleContext);
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}
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// height
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//
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// "Specifies the desired height (above the baseline) of the space."
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//
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// values: length
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// default: 0ex
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//
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// The default value is "0ex", so unitless values can be ignored.
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// We do not allow negative values. See bug 716349.
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//
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mHeight = 0;
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GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::height,
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value);
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if (!value.IsEmpty()) {
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ParseNumericValue(value, &mHeight, 0,
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aPresContext, mStyleContext);
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}
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// depth
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//
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// "Specifies the desired depth (below the baseline) of the space."
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//
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// values: length
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// default: 0ex
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//
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// The default value is "0ex", so unitless values can be ignored.
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// We do not allow negative values. See bug 716349.
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//
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mDepth = 0;
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GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::depth_,
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value);
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if (!value.IsEmpty()) {
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ParseNumericValue(value, &mDepth, 0,
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aPresContext, mStyleContext);
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}
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}
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NS_IMETHODIMP
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nsMathMLmspaceFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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ProcessAttributes(aPresContext);
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// nsLineLayout doesn't expect negative widths.
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// XXXfredw Negative spaces are not implemented. See bug 717546
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mBoundingMetrics = nsBoundingMetrics();
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mBoundingMetrics.width = NS_MAX(0, mWidth);
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mBoundingMetrics.ascent = mHeight;
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mBoundingMetrics.descent = mDepth;
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mBoundingMetrics.leftBearing = 0;
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mBoundingMetrics.rightBearing = mBoundingMetrics.width;
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aDesiredSize.ascent = mHeight;
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aDesiredSize.width = mBoundingMetrics.width;
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aDesiredSize.height = aDesiredSize.ascent + mDepth;
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// Also return our bounding metrics
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
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aStatus = NS_FRAME_COMPLETE;
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
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return NS_OK;
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}
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/* virtual */ nsresult
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nsMathMLmspaceFrame::MeasureForWidth(nsRenderingContext& aRenderingContext,
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nsHTMLReflowMetrics& aDesiredSize)
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{
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ProcessAttributes(PresContext());
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mBoundingMetrics = nsBoundingMetrics();
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mBoundingMetrics.width = NS_MAX(0, mWidth);
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aDesiredSize.width = mBoundingMetrics.width;
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
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return NS_OK;
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}
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