mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
167 lines
6.2 KiB
C++
167 lines
6.2 KiB
C++
/* -*- 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
|
|
*
|
|
* 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.
|
|
*
|
|
* 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.
|
|
*
|
|
* Contributor(s):
|
|
* Roger B. Sidje <rbs@maths.uq.edu.au>
|
|
* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
|
|
* Shyjan Mahamud <mahamud@cs.cmu.edu>
|
|
* Frederic Wang <fred.wang@free.fr>
|
|
*
|
|
* 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 ***** */
|
|
|
|
#ifndef nsMathMLmfracFrame_h___
|
|
#define nsMathMLmfracFrame_h___
|
|
|
|
#include "nsCOMPtr.h"
|
|
#include "nsMathMLContainerFrame.h"
|
|
|
|
//
|
|
// <mfrac> -- form a fraction from two subexpressions
|
|
//
|
|
|
|
/*
|
|
The MathML REC describes:
|
|
|
|
The <mfrac> element is used for fractions. It can also be used to mark up
|
|
fraction-like objects such as binomial coefficients and Legendre symbols.
|
|
The syntax for <mfrac> is:
|
|
<mfrac> numerator denominator </mfrac>
|
|
|
|
Attributes of <mfrac>:
|
|
Name values default
|
|
linethickness number [ v-unit ] | thin | medium | thick 1
|
|
|
|
E.g.,
|
|
linethickness=2 actually means that linethickness=2*DEFAULT_THICKNESS
|
|
(DEFAULT_THICKNESS is not specified by MathML, see below.)
|
|
|
|
The linethickness attribute indicates the thickness of the horizontal
|
|
"fraction bar", or "rule", typically used to render fractions. A fraction
|
|
with linethickness="0" renders without the bar, and might be used within
|
|
binomial coefficients. A linethickness greater than one might be used with
|
|
nested fractions.
|
|
|
|
In general, the value of linethickness can be a number, as a multiplier
|
|
of the default thickness of the fraction bar (the default thickness is
|
|
not specified by MathML), or a number with a unit of vertical length (see
|
|
Section 2.3.3), or one of the keywords medium (same as 1), thin (thinner
|
|
than 1, otherwise up to the renderer), or thick (thicker than 1, otherwise
|
|
up to the renderer).
|
|
|
|
The <mfrac> element sets displaystyle to "false", or if it was already
|
|
false increments scriptlevel by 1, within numerator and denominator.
|
|
These attributes are inherited by every element from its rendering
|
|
environment, but can be set explicitly only on the <mstyle>
|
|
element.
|
|
*/
|
|
|
|
class nsMathMLmfracFrame : public nsMathMLContainerFrame {
|
|
public:
|
|
NS_DECL_FRAMEARENA_HELPERS
|
|
|
|
friend nsIFrame* NS_NewMathMLmfracFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
|
|
|
|
virtual eMathMLFrameType GetMathMLFrameType();
|
|
|
|
NS_IMETHOD
|
|
AttributeChanged(PRInt32 aNameSpaceID,
|
|
nsIAtom* aAttribute,
|
|
PRInt32 aModType);
|
|
|
|
NS_IMETHOD
|
|
Init(nsIContent* aContent,
|
|
nsIFrame* aParent,
|
|
nsIFrame* aPrevInFlow);
|
|
|
|
virtual nsresult
|
|
MeasureForWidth(nsIRenderingContext& aRenderingContext,
|
|
nsHTMLReflowMetrics& aDesiredSize);
|
|
|
|
virtual nsresult
|
|
Place(nsIRenderingContext& aRenderingContext,
|
|
PRBool aPlaceOrigin,
|
|
nsHTMLReflowMetrics& aDesiredSize);
|
|
|
|
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsRect& aDirtyRect,
|
|
const nsDisplayListSet& aLists);
|
|
|
|
NS_IMETHOD
|
|
TransmitAutomaticData();
|
|
|
|
NS_IMETHOD
|
|
UpdatePresentationDataFromChildAt(PRInt32 aFirstIndex,
|
|
PRInt32 aLastIndex,
|
|
PRUint32 aFlagsValues,
|
|
PRUint32 aFlagsToUpdate);
|
|
|
|
// override the base method so that we can deal with the fraction line
|
|
virtual nscoord
|
|
FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize);
|
|
|
|
// helper to translate the thickness attribute into a usable form
|
|
static nscoord
|
|
CalcLineThickness(nsPresContext* aPresContext,
|
|
nsStyleContext* aStyleContext,
|
|
nsString& aThicknessAttribute,
|
|
nscoord onePixel,
|
|
nscoord aDefaultRuleThickness);
|
|
|
|
protected:
|
|
nsMathMLmfracFrame(nsStyleContext* aContext) : nsMathMLContainerFrame(aContext) {}
|
|
virtual ~nsMathMLmfracFrame();
|
|
|
|
virtual PRIntn GetSkipSides() const { return 0; }
|
|
|
|
PRBool
|
|
IsBevelled();
|
|
|
|
nsresult PlaceInternal(nsIRenderingContext& aRenderingContext,
|
|
PRBool aPlaceOrigin,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
PRBool aWidthOnly);
|
|
|
|
// Display a slash
|
|
nsresult DisplaySlash(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame, const nsRect& aRect,
|
|
nscoord aThickness,
|
|
const nsDisplayListSet& aLists);
|
|
|
|
nsRect mLineRect;
|
|
nsMathMLChar* mSlashChar;
|
|
nscoord mLineThickness;
|
|
PRPackedBool mIsBevelled;
|
|
};
|
|
|
|
#endif /* nsMathMLmfracFrame_h___ */
|