зеркало из https://github.com/mozilla/gecko-dev.git
154 строки
5.9 KiB
C++
154 строки
5.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* The University Of Queensland.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. 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>
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* Frederic Wang <fred.wang@free.fr>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsMathMLmfracFrame_h___
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#define nsMathMLmfracFrame_h___
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#include "nsCOMPtr.h"
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#include "nsMathMLContainerFrame.h"
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//
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// <mfrac> -- form a fraction from two subexpressions
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//
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/*
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The MathML REC describes:
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The <mfrac> element is used for fractions. It can also be used to mark up
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fraction-like objects such as binomial coefficients and Legendre symbols.
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The syntax for <mfrac> is:
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<mfrac> numerator denominator </mfrac>
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Attributes of <mfrac>:
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Name values default
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linethickness number [ v-unit ] | thin | medium | thick 1
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E.g.,
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linethickness=2 actually means that linethickness=2*DEFAULT_THICKNESS
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(DEFAULT_THICKNESS is not specified by MathML, see below.)
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The linethickness attribute indicates the thickness of the horizontal
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"fraction bar", or "rule", typically used to render fractions. A fraction
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with linethickness="0" renders without the bar, and might be used within
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binomial coefficients. A linethickness greater than one might be used with
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nested fractions.
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In general, the value of linethickness can be a number, as a multiplier
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of the default thickness of the fraction bar (the default thickness is
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not specified by MathML), or a number with a unit of vertical length (see
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Section 2.3.3), or one of the keywords medium (same as 1), thin (thinner
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than 1, otherwise up to the renderer), or thick (thicker than 1, otherwise
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up to the renderer).
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The <mfrac> element sets displaystyle to "false", or if it was already
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false increments scriptlevel by 1, within numerator and denominator.
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These attributes are inherited by every element from its rendering
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environment, but can be set explicitly only on the <mstyle>
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element.
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*/
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class nsMathMLmfracFrame : public nsMathMLContainerFrame {
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public:
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NS_DECL_FRAMEARENA_HELPERS
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friend nsIFrame* NS_NewMathMLmfracFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
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virtual eMathMLFrameType GetMathMLFrameType();
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virtual nsresult
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MeasureForWidth(nsRenderingContext& aRenderingContext,
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nsHTMLReflowMetrics& aDesiredSize);
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virtual nsresult
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Place(nsRenderingContext& aRenderingContext,
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bool aPlaceOrigin,
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nsHTMLReflowMetrics& aDesiredSize);
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NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists);
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NS_IMETHOD
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TransmitAutomaticData();
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NS_IMETHOD
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UpdatePresentationDataFromChildAt(PRInt32 aFirstIndex,
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PRInt32 aLastIndex,
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PRUint32 aFlagsValues,
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PRUint32 aFlagsToUpdate);
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// override the base method so that we can deal with the fraction line
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virtual nscoord
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FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize);
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// helper to translate the thickness attribute into a usable form
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static nscoord
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CalcLineThickness(nsPresContext* aPresContext,
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nsStyleContext* aStyleContext,
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nsString& aThicknessAttribute,
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nscoord onePixel,
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nscoord aDefaultRuleThickness);
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protected:
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nsMathMLmfracFrame(nsStyleContext* aContext) : nsMathMLContainerFrame(aContext) {}
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virtual ~nsMathMLmfracFrame();
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virtual PRIntn GetSkipSides() const { return 0; }
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nsresult PlaceInternal(nsRenderingContext& aRenderingContext,
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bool aPlaceOrigin,
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nsHTMLReflowMetrics& aDesiredSize,
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bool aWidthOnly);
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// Display a slash
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nsresult DisplaySlash(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame, const nsRect& aRect,
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nscoord aThickness,
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const nsDisplayListSet& aLists);
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nsRect mLineRect;
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nsMathMLChar* mSlashChar;
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nscoord mLineThickness;
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bool mIsBevelled;
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};
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#endif /* nsMathMLmfracFrame_h___ */
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