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comparison: layout/mathml/nsMathMLmfracFrame.h
layout/mathml/nsMathMLmfracFrame.h
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- TOR_BUG_9701
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| -1:000000000000 | 0:9b0a1ce33098 |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef nsMathMLmfracFrame_h___ | |
| 7 #define nsMathMLmfracFrame_h___ | |
| 8 | |
| 9 #include "mozilla/Attributes.h" | |
| 10 #include "nsMathMLContainerFrame.h" | |
| 11 | |
| 12 // | |
| 13 // <mfrac> -- form a fraction from two subexpressions | |
| 14 // | |
| 15 | |
| 16 /* | |
| 17 The MathML REC describes: | |
| 18 | |
| 19 The <mfrac> element is used for fractions. It can also be used to mark up | |
| 20 fraction-like objects such as binomial coefficients and Legendre symbols. | |
| 21 The syntax for <mfrac> is: | |
| 22 <mfrac> numerator denominator </mfrac> | |
| 23 | |
| 24 Attributes of <mfrac>: | |
| 25 Name values default | |
| 26 linethickness number [ v-unit ] | thin | medium | thick 1 | |
| 27 | |
| 28 E.g., | |
| 29 linethickness=2 actually means that linethickness=2*DEFAULT_THICKNESS | |
| 30 (DEFAULT_THICKNESS is not specified by MathML, see below.) | |
| 31 | |
| 32 The linethickness attribute indicates the thickness of the horizontal | |
| 33 "fraction bar", or "rule", typically used to render fractions. A fraction | |
| 34 with linethickness="0" renders without the bar, and might be used within | |
| 35 binomial coefficients. A linethickness greater than one might be used with | |
| 36 nested fractions. | |
| 37 | |
| 38 In general, the value of linethickness can be a number, as a multiplier | |
| 39 of the default thickness of the fraction bar (the default thickness is | |
| 40 not specified by MathML), or a number with a unit of vertical length (see | |
| 41 Section 2.3.3), or one of the keywords medium (same as 1), thin (thinner | |
| 42 than 1, otherwise up to the renderer), or thick (thicker than 1, otherwise | |
| 43 up to the renderer). | |
| 44 | |
| 45 The <mfrac> element sets displaystyle to "false", or if it was already | |
| 46 false increments scriptlevel by 1, within numerator and denominator. | |
| 47 These attributes are inherited by every element from its rendering | |
| 48 environment, but can be set explicitly only on the <mstyle> | |
| 49 element. | |
| 50 */ | |
| 51 | |
| 52 class nsMathMLmfracFrame : public nsMathMLContainerFrame { | |
| 53 public: | |
| 54 NS_DECL_FRAMEARENA_HELPERS | |
| 55 | |
| 56 friend nsIFrame* NS_NewMathMLmfracFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); | |
| 57 | |
| 58 virtual eMathMLFrameType GetMathMLFrameType() MOZ_OVERRIDE; | |
| 59 | |
| 60 virtual nsresult | |
| 61 MeasureForWidth(nsRenderingContext& aRenderingContext, | |
| 62 nsHTMLReflowMetrics& aDesiredSize) MOZ_OVERRIDE; | |
| 63 | |
| 64 virtual nsresult | |
| 65 Place(nsRenderingContext& aRenderingContext, | |
| 66 bool aPlaceOrigin, | |
| 67 nsHTMLReflowMetrics& aDesiredSize) MOZ_OVERRIDE; | |
| 68 | |
| 69 virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder, | |
| 70 const nsRect& aDirtyRect, | |
| 71 const nsDisplayListSet& aLists) MOZ_OVERRIDE; | |
| 72 | |
| 73 NS_IMETHOD | |
| 74 TransmitAutomaticData() MOZ_OVERRIDE; | |
| 75 | |
| 76 // override the base method so that we can deal with the fraction line | |
| 77 virtual nscoord | |
| 78 FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize) MOZ_OVERRIDE; | |
| 79 | |
| 80 // helper to translate the thickness attribute into a usable form | |
| 81 static nscoord | |
| 82 CalcLineThickness(nsPresContext* aPresContext, | |
| 83 nsStyleContext* aStyleContext, | |
| 84 nsString& aThicknessAttribute, | |
| 85 nscoord onePixel, | |
| 86 nscoord aDefaultRuleThickness); | |
| 87 | |
| 88 uint8_t | |
| 89 ScriptIncrement(nsIFrame* aFrame) MOZ_OVERRIDE; | |
| 90 | |
| 91 protected: | |
| 92 nsMathMLmfracFrame(nsStyleContext* aContext) : nsMathMLContainerFrame(aContext) {} | |
| 93 virtual ~nsMathMLmfracFrame(); | |
| 94 | |
| 95 nsresult PlaceInternal(nsRenderingContext& aRenderingContext, | |
| 96 bool aPlaceOrigin, | |
| 97 nsHTMLReflowMetrics& aDesiredSize, | |
| 98 bool aWidthOnly); | |
| 99 | |
| 100 // Display a slash | |
| 101 void DisplaySlash(nsDisplayListBuilder* aBuilder, | |
| 102 nsIFrame* aFrame, const nsRect& aRect, | |
| 103 nscoord aThickness, | |
| 104 const nsDisplayListSet& aLists); | |
| 105 | |
| 106 nsRect mLineRect; | |
| 107 nsMathMLChar* mSlashChar; | |
| 108 nscoord mLineThickness; | |
| 109 bool mIsBevelled; | |
| 110 }; | |
| 111 | |
| 112 #endif /* nsMathMLmfracFrame_h___ */ |
