LCOV - code coverage report
Current view: directory - layout/mathml - nsMathMLmfracFrame.h (source / functions) Found Hit Coverage
Test: app.info Lines: 2 0 0.0 %
Date: 2012-06-02 Functions: 2 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is Mozilla MathML Project.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * The University Of Queensland.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 1999
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *   Roger B. Sidje <rbs@maths.uq.edu.au>
      24                 :  *   David J. Fiddes <D.J.Fiddes@hw.ac.uk>
      25                 :  *   Shyjan Mahamud <mahamud@cs.cmu.edu>
      26                 :  *   Frederic Wang <fred.wang@free.fr>
      27                 :  *
      28                 :  * Alternatively, the contents of this file may be used under the terms of
      29                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      30                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      31                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      32                 :  * of those above. If you wish to allow use of your version of this file only
      33                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      34                 :  * use your version of this file under the terms of the MPL, indicate your
      35                 :  * decision by deleting the provisions above and replace them with the notice
      36                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      37                 :  * the provisions above, a recipient may use your version of this file under
      38                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      39                 :  *
      40                 :  * ***** END LICENSE BLOCK ***** */
      41                 : 
      42                 : #ifndef nsMathMLmfracFrame_h___
      43                 : #define nsMathMLmfracFrame_h___
      44                 : 
      45                 : #include "nsCOMPtr.h"
      46                 : #include "nsMathMLContainerFrame.h"
      47                 : 
      48                 : //
      49                 : // <mfrac> -- form a fraction from two subexpressions 
      50                 : //
      51                 : 
      52                 : /*
      53                 : The MathML REC describes:
      54                 : 
      55                 : The <mfrac> element is used for fractions. It can also be used to mark up 
      56                 : fraction-like objects such as binomial coefficients and Legendre symbols. 
      57                 : The syntax for <mfrac> is:
      58                 :   <mfrac> numerator denominator </mfrac>
      59                 : 
      60                 : Attributes of <mfrac>:
      61                 :      Name                      values                     default 
      62                 :   linethickness  number [ v-unit ] | thin | medium | thick  1 
      63                 : 
      64                 : E.g., 
      65                 : linethickness=2 actually means that linethickness=2*DEFAULT_THICKNESS
      66                 : (DEFAULT_THICKNESS is not specified by MathML, see below.)
      67                 : 
      68                 : The linethickness attribute indicates the thickness of the horizontal
      69                 : "fraction bar", or "rule", typically used to render fractions. A fraction
      70                 : with linethickness="0" renders without the bar, and might be used within
      71                 : binomial coefficients. A linethickness greater than one might be used with
      72                 : nested fractions. 
      73                 : 
      74                 : In general, the value of linethickness can be a number, as a multiplier
      75                 : of the default thickness of the fraction bar (the default thickness is
      76                 : not specified by MathML), or a number with a unit of vertical length (see
      77                 : Section 2.3.3), or one of the keywords medium (same as 1), thin (thinner
      78                 : than 1, otherwise up to the renderer), or thick (thicker than 1, otherwise
      79                 : up to the renderer). 
      80                 : 
      81                 : The <mfrac> element sets displaystyle to "false", or if it was already
      82                 : false increments scriptlevel by 1, within numerator and denominator.
      83                 : These attributes are inherited by every element from its rendering 
      84                 : environment, but can be set explicitly only on the <mstyle> 
      85                 : element. 
      86                 : */
      87                 : 
      88                 : class nsMathMLmfracFrame : public nsMathMLContainerFrame {
      89                 : public:
      90                 :   NS_DECL_FRAMEARENA_HELPERS
      91                 : 
      92                 :   friend nsIFrame* NS_NewMathMLmfracFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
      93                 : 
      94                 :   virtual eMathMLFrameType GetMathMLFrameType();
      95                 : 
      96                 :   virtual nsresult
      97                 :   MeasureForWidth(nsRenderingContext& aRenderingContext,
      98                 :                   nsHTMLReflowMetrics& aDesiredSize);
      99                 : 
     100                 :   virtual nsresult
     101                 :   Place(nsRenderingContext& aRenderingContext,
     102                 :         bool                 aPlaceOrigin,
     103                 :         nsHTMLReflowMetrics& aDesiredSize);
     104                 : 
     105                 :   NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
     106                 :                               const nsRect&           aDirtyRect,
     107                 :                               const nsDisplayListSet& aLists);
     108                 : 
     109                 :   NS_IMETHOD
     110                 :   TransmitAutomaticData();
     111                 : 
     112                 :   NS_IMETHOD
     113                 :   UpdatePresentationDataFromChildAt(PRInt32         aFirstIndex,
     114                 :                                     PRInt32         aLastIndex,
     115                 :                                     PRUint32        aFlagsValues,
     116                 :                                     PRUint32        aFlagsToUpdate);
     117                 : 
     118                 :   // override the base method so that we can deal with the fraction line
     119                 :   virtual nscoord
     120                 :   FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize);
     121                 : 
     122                 :   // helper to translate the thickness attribute into a usable form
     123                 :   static nscoord 
     124                 :   CalcLineThickness(nsPresContext*  aPresContext,
     125                 :                     nsStyleContext*  aStyleContext,
     126                 :                     nsString&        aThicknessAttribute,
     127                 :                     nscoord          onePixel,
     128                 :                     nscoord          aDefaultRuleThickness);
     129                 : 
     130                 : protected:
     131               0 :   nsMathMLmfracFrame(nsStyleContext* aContext) : nsMathMLContainerFrame(aContext) {}
     132                 :   virtual ~nsMathMLmfracFrame();
     133                 :   
     134               0 :   virtual PRIntn GetSkipSides() const { return 0; }
     135                 : 
     136                 :   nsresult PlaceInternal(nsRenderingContext& aRenderingContext,
     137                 :                          bool                 aPlaceOrigin,
     138                 :                          nsHTMLReflowMetrics& aDesiredSize,
     139                 :                          bool                 aWidthOnly);
     140                 : 
     141                 :   // Display a slash
     142                 :   nsresult DisplaySlash(nsDisplayListBuilder* aBuilder,
     143                 :                         nsIFrame* aFrame, const nsRect& aRect,
     144                 :                         nscoord aThickness,
     145                 :                         const nsDisplayListSet& aLists);
     146                 : 
     147                 :   nsRect        mLineRect;
     148                 :   nsMathMLChar* mSlashChar;
     149                 :   nscoord       mLineThickness;
     150                 :   bool          mIsBevelled;
     151                 : };
     152                 : 
     153                 : #endif /* nsMathMLmfracFrame_h___ */

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