87 lines
3.0 KiB
C++
87 lines
3.0 KiB
C++
/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla MathML Project.
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*
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* The Initial Developer of the Original Code is The University Of
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* Queensland. Portions created by The University Of Queensland are
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* Copyright (C) 1999 The University Of Queensland. All Rights Reserved.
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*
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* Contributor(s):
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* Roger B. Sidje <rbs@maths.uq.edu.au>
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* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
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* Shyjan Mahamud <mahamud@cs.cmu.edu> (added TeX rendering rules)
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*/
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#ifndef nsMathMLmsubFrame_h___
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#define nsMathMLmsubFrame_h___
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#include "nsCOMPtr.h"
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#include "nsMathMLContainerFrame.h"
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//
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// <msub> -- attach a subscript to a base
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//
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class nsMathMLmsubFrame : public nsMathMLContainerFrame {
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public:
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friend nsresult NS_NewMathMLmsubFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame);
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NS_IMETHOD
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Init(nsIPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aParent,
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nsIStyleContext* aContext,
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nsIFrame* aPrevInFlow);
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NS_IMETHOD
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Place(nsIPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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PRBool aPlaceOrigin,
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nsHTMLReflowMetrics& aDesiredSize);
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static nsresult
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PlaceSubScript (nsIPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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PRBool aPlaceOrigin,
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nsHTMLReflowMetrics& aDesiredSize,
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nsIFrame* aForFrame,
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nscoord aUserSubScriptShift = 0,
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nscoord aScriptSpace = NSFloatPointsToTwips(0.5f));
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NS_IMETHOD
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SetInitialChildList(nsIPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList)
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{
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nsresult rv;
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rv = nsMathMLContainerFrame::SetInitialChildList(aPresContext, aListName, aChildList);
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// 1. The REC says:
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// The <msub> element increments scriptlevel by 1, and sets displaystyle to
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// "false", within subscript, but leaves both attributes unchanged within base.
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// 2. The TeXbook (Ch 17. p.141) says the subscript is compressed
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UpdatePresentationDataFromChildAt(aPresContext, 1, -1, 1,
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~NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED,
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NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED);
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// check whether or not this is an embellished operator
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EmbellishOperator();
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return rv;
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}
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protected:
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nsMathMLmsubFrame();
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virtual ~nsMathMLmsubFrame();
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virtual PRIntn GetSkipSides() const { return 0; }
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};
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#endif /* nsMathMLmsubFrame_h___ */
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