LCOV - code coverage report
Current view: directory - layout/mathml - nsMathMLmrootFrame.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 173 0 0.0 %
Date: 2012-06-02 Functions: 14 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                 :  *   Vilya Harvey <vilya@nag.co.uk>
      26                 :  *   Shyjan Mahamud <mahamud@cs.cmu.edu>
      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                 : 
      43                 : #include "nsCOMPtr.h"
      44                 : #include "nsFrame.h"
      45                 : #include "nsPresContext.h"
      46                 : #include "nsStyleContext.h"
      47                 : #include "nsStyleConsts.h"
      48                 : #include "nsRenderingContext.h"
      49                 : 
      50                 : #include "nsMathMLmrootFrame.h"
      51                 : 
      52                 : //
      53                 : // <msqrt> and <mroot> -- form a radical - implementation
      54                 : //
      55                 : 
      56                 : //NOTE:
      57                 : //  The code assumes that TeX fonts are picked.
      58                 : //  There is no fall-back to draw the branches of the sqrt explicitly
      59                 : //  in the case where TeX fonts are not there. In general, there are no
      60                 : //  fall-back(s) in MathML when some (freely-downloadable) fonts are missing.
      61                 : //  Otherwise, this will add much work and unnecessary complexity to the core
      62                 : //  MathML  engine. Assuming that authors have the free fonts is part of the
      63                 : //  deal. We are not responsible for cases of misconfigurations out there.
      64                 : 
      65                 : // additional style context to be used by our MathMLChar.
      66                 : #define NS_SQR_CHAR_STYLE_CONTEXT_INDEX   0
      67                 : 
      68                 : static const PRUnichar kSqrChar = PRUnichar(0x221A);
      69                 : 
      70                 : nsIFrame*
      71               0 : NS_NewMathMLmrootFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
      72                 : {
      73               0 :   return new (aPresShell) nsMathMLmrootFrame(aContext);
      74                 : }
      75                 : 
      76               0 : NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmrootFrame)
      77                 : 
      78               0 : nsMathMLmrootFrame::nsMathMLmrootFrame(nsStyleContext* aContext) :
      79                 :   nsMathMLContainerFrame(aContext),
      80                 :   mSqrChar(),
      81               0 :   mBarRect()
      82                 : {
      83               0 : }
      84                 : 
      85               0 : nsMathMLmrootFrame::~nsMathMLmrootFrame()
      86                 : {
      87               0 : }
      88                 : 
      89                 : NS_IMETHODIMP
      90               0 : nsMathMLmrootFrame::Init(nsIContent*      aContent,
      91                 :                          nsIFrame*        aParent,
      92                 :                          nsIFrame*        aPrevInFlow)
      93                 : {
      94               0 :   nsresult rv = nsMathMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
      95                 :   
      96               0 :   nsPresContext *presContext = PresContext();
      97                 : 
      98                 :   // No need to track the style context given to our MathML char. 
      99                 :   // The Style System will use Get/SetAdditionalStyleContext() to keep it
     100                 :   // up-to-date if dynamic changes arise.
     101               0 :   nsAutoString sqrChar; sqrChar.Assign(kSqrChar);
     102               0 :   mSqrChar.SetData(presContext, sqrChar);
     103               0 :   ResolveMathMLCharStyle(presContext, mContent, mStyleContext, &mSqrChar, true);
     104                 : 
     105               0 :   return rv;
     106                 : }
     107                 : 
     108                 : NS_IMETHODIMP
     109               0 : nsMathMLmrootFrame::TransmitAutomaticData()
     110                 : {
     111                 :   // 1. The REC says:
     112                 :   //    The <mroot> element increments scriptlevel by 2, and sets displaystyle to
     113                 :   //    "false", within index, but leaves both attributes unchanged within base.
     114                 :   // 2. The TeXbook (Ch 17. p.141) says \sqrt is compressed
     115                 :   UpdatePresentationDataFromChildAt(1, 1,
     116                 :     ~NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED,
     117               0 :      NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED);
     118                 :   UpdatePresentationDataFromChildAt(0, 0,
     119               0 :      NS_MATHML_COMPRESSED, NS_MATHML_COMPRESSED);
     120                 : 
     121               0 :   return NS_OK;
     122                 : }
     123                 : 
     124                 : NS_IMETHODIMP
     125               0 : nsMathMLmrootFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
     126                 :                                      const nsRect&           aDirtyRect,
     127                 :                                      const nsDisplayListSet& aLists)
     128                 : {
     129                 :   /////////////
     130                 :   // paint the content we are square-rooting
     131               0 :   nsresult rv = nsMathMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
     132               0 :   NS_ENSURE_SUCCESS(rv, rv);
     133                 :   
     134                 :   /////////////
     135                 :   // paint the sqrt symbol
     136               0 :   if (!NS_MATHML_HAS_ERROR(mPresentationData.flags)) {
     137               0 :     rv = mSqrChar.Display(aBuilder, this, aLists);
     138               0 :     NS_ENSURE_SUCCESS(rv, rv);
     139                 : 
     140               0 :     rv = DisplayBar(aBuilder, this, mBarRect, aLists);
     141               0 :     NS_ENSURE_SUCCESS(rv, rv);
     142                 : 
     143                 : #if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
     144                 :     // for visual debug
     145                 :     nsRect rect;
     146                 :     mSqrChar.GetRect(rect);
     147                 :     nsBoundingMetrics bm;
     148                 :     mSqrChar.GetBoundingMetrics(bm);
     149                 :     rv = DisplayBoundingMetrics(aBuilder, this, rect.TopLeft(), bm, aLists);
     150                 : #endif
     151                 :   }
     152                 : 
     153               0 :   return rv;
     154                 : }
     155                 : 
     156                 : static void
     157               0 : GetRadicalXOffsets(nscoord aIndexWidth, nscoord aSqrWidth,
     158                 :                    nsFontMetrics* aFontMetrics,
     159                 :                    nscoord* aIndexOffset, nscoord* aSqrOffset)
     160                 : {
     161                 :   // The index is tucked in closer to the radical while making sure
     162                 :   // that the kern does not make the index and radical collide
     163                 :   nscoord dxIndex, dxSqr;
     164               0 :   nscoord xHeight = aFontMetrics->XHeight();
     165               0 :   nscoord indexRadicalKern = NSToCoordRound(1.35f * xHeight);
     166               0 :   if (indexRadicalKern > aIndexWidth) {
     167               0 :     dxIndex = indexRadicalKern - aIndexWidth;
     168               0 :     dxSqr = 0;
     169                 :   }
     170                 :   else {
     171               0 :     dxIndex = 0;
     172               0 :     dxSqr = aIndexWidth - indexRadicalKern;
     173                 :   }
     174                 :   // avoid collision by leaving a minimum space between index and radical
     175               0 :   nscoord minimumClearance = aSqrWidth/2;
     176               0 :   if (dxIndex + aIndexWidth + minimumClearance > dxSqr + aSqrWidth) {
     177               0 :     if (aIndexWidth + minimumClearance < aSqrWidth) {
     178               0 :       dxIndex = aSqrWidth - (aIndexWidth + minimumClearance);
     179               0 :       dxSqr = 0;
     180                 :     }
     181                 :     else {
     182               0 :       dxIndex = 0;
     183               0 :       dxSqr = (aIndexWidth + minimumClearance) - aSqrWidth;
     184                 :     }
     185                 :   }
     186                 : 
     187               0 :   if (aIndexOffset)
     188               0 :     *aIndexOffset = dxIndex;
     189               0 :   if (aSqrOffset)
     190               0 :     *aSqrOffset = dxSqr;
     191               0 : }
     192                 : 
     193                 : NS_IMETHODIMP
     194               0 : nsMathMLmrootFrame::Reflow(nsPresContext*          aPresContext,
     195                 :                            nsHTMLReflowMetrics&     aDesiredSize,
     196                 :                            const nsHTMLReflowState& aReflowState,
     197                 :                            nsReflowStatus&          aStatus)
     198                 : {
     199               0 :   nsresult rv = NS_OK;
     200               0 :   nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
     201                 :   nsReflowStatus childStatus;
     202                 : 
     203               0 :   aDesiredSize.width = aDesiredSize.height = 0;
     204               0 :   aDesiredSize.ascent = 0;
     205                 : 
     206               0 :   nsBoundingMetrics bmSqr, bmBase, bmIndex;
     207               0 :   nsRenderingContext& renderingContext = *aReflowState.rendContext;
     208                 : 
     209                 :   //////////////////
     210                 :   // Reflow Children
     211                 : 
     212               0 :   PRInt32 count = 0;
     213               0 :   nsIFrame* baseFrame = nsnull;
     214               0 :   nsIFrame* indexFrame = nsnull;
     215               0 :   nsHTMLReflowMetrics baseSize;
     216               0 :   nsHTMLReflowMetrics indexSize;
     217               0 :   nsIFrame* childFrame = mFrames.FirstChild();
     218               0 :   while (childFrame) {
     219                 :     // ask our children to compute their bounding metrics 
     220                 :     nsHTMLReflowMetrics childDesiredSize(aDesiredSize.mFlags
     221               0 :                                          | NS_REFLOW_CALC_BOUNDING_METRICS);
     222                 :     nsHTMLReflowState childReflowState(aPresContext, aReflowState,
     223               0 :                                        childFrame, availSize);
     224                 :     rv = ReflowChild(childFrame, aPresContext,
     225               0 :                      childDesiredSize, childReflowState, childStatus);
     226                 :     //NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status");
     227               0 :     if (NS_FAILED(rv)) {
     228                 :       // Call DidReflow() for the child frames we successfully did reflow.
     229               0 :       DidReflowChildren(mFrames.FirstChild(), childFrame);
     230               0 :       return rv;
     231                 :     }
     232               0 :     if (0 == count) {
     233                 :       // base 
     234               0 :       baseFrame = childFrame;
     235               0 :       baseSize = childDesiredSize;
     236               0 :       bmBase = childDesiredSize.mBoundingMetrics;
     237                 :     }
     238               0 :     else if (1 == count) {
     239                 :       // index
     240               0 :       indexFrame = childFrame;
     241               0 :       indexSize = childDesiredSize;
     242               0 :       bmIndex = childDesiredSize.mBoundingMetrics;
     243                 :     }
     244               0 :     count++;
     245               0 :     childFrame = childFrame->GetNextSibling();
     246                 :   }
     247               0 :   if (2 != count) {
     248                 :     // report an error, encourage people to get their markups in order
     249               0 :     rv = ReflowError(renderingContext, aDesiredSize);
     250               0 :     aStatus = NS_FRAME_COMPLETE;
     251               0 :     NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
     252                 :     // Call DidReflow() for the child frames we successfully did reflow.
     253               0 :     DidReflowChildren(mFrames.FirstChild(), childFrame);
     254               0 :     return rv;
     255                 :   }
     256                 : 
     257                 :   ////////////
     258                 :   // Prepare the radical symbol and the overline bar
     259                 : 
     260               0 :   nsRefPtr<nsFontMetrics> fm;
     261               0 :   nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
     262               0 :   renderingContext.SetFont(fm);
     263                 : 
     264                 :   // For radical glyphs from TeX fonts and some of the radical glyphs from
     265                 :   // Mathematica fonts, the thickness of the overline can be obtained from the
     266                 :   // ascent of the glyph.  Most fonts however have radical glyphs above the
     267                 :   // baseline so no assumption can be made about the meaning of the ascent.
     268                 :   nscoord ruleThickness, leading, em;
     269               0 :   GetRuleThickness(renderingContext, fm, ruleThickness);
     270                 : 
     271               0 :   PRUnichar one = '1';
     272               0 :   nsBoundingMetrics bmOne = renderingContext.GetBoundingMetrics(&one, 1);
     273                 : 
     274                 :   // get the leading to be left at the top of the resulting frame
     275                 :   // this seems more reliable than using fm->GetLeading() on suspicious fonts
     276               0 :   GetEmHeight(fm, em);
     277               0 :   leading = nscoord(0.2f * em); 
     278                 : 
     279                 :   // Rule 11, App. G, TeXbook
     280                 :   // psi = clearance between rule and content
     281               0 :   nscoord phi = 0, psi = 0;
     282               0 :   if (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags))
     283               0 :     phi = fm->XHeight();
     284                 :   else
     285               0 :     phi = ruleThickness;
     286               0 :   psi = ruleThickness + phi/4;
     287                 : 
     288                 :   // built-in: adjust clearance psi to emulate \mathstrut using '1' (TexBook, p.131)
     289               0 :   if (bmOne.ascent > bmBase.ascent)
     290               0 :     psi += bmOne.ascent - bmBase.ascent;
     291                 : 
     292                 :   // make sure that the rule appears on on screen
     293               0 :   nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
     294               0 :   if (ruleThickness < onePixel) {
     295               0 :     ruleThickness = onePixel;
     296                 :   }
     297                 : 
     298                 :   // adjust clearance psi to get an exact number of pixels -- this
     299                 :   // gives a nicer & uniform look on stacked radicals (bug 130282)
     300               0 :   nscoord delta = psi % onePixel;
     301               0 :   if (delta)
     302               0 :     psi += onePixel - delta; // round up
     303                 : 
     304                 :   // Stretch the radical symbol to the appropriate height if it is not big enough.
     305               0 :   nsBoundingMetrics contSize = bmBase;
     306               0 :   contSize.descent = bmBase.ascent + bmBase.descent + psi;
     307               0 :   contSize.ascent = ruleThickness;
     308                 : 
     309                 :   // height(radical) should be >= height(base) + psi + ruleThickness
     310               0 :   nsBoundingMetrics radicalSize;
     311                 :   mSqrChar.Stretch(aPresContext, renderingContext,
     312                 :                    NS_STRETCH_DIRECTION_VERTICAL, 
     313                 :                    contSize, radicalSize,
     314                 :                    NS_STRETCH_LARGER,
     315               0 :                    NS_MATHML_IS_RTL(mPresentationData.flags));
     316                 :   // radicalSize have changed at this point, and should match with
     317                 :   // the bounding metrics of the char
     318               0 :   mSqrChar.GetBoundingMetrics(bmSqr);
     319                 : 
     320                 :   // Update the desired size for the container (like msqrt, index is not yet included)
     321                 :   // the baseline will be that of the base.
     322               0 :   mBoundingMetrics.ascent = bmBase.ascent + psi + ruleThickness;
     323                 :   mBoundingMetrics.descent = 
     324                 :     NS_MAX(bmBase.descent,
     325               0 :            (bmSqr.ascent + bmSqr.descent - mBoundingMetrics.ascent));
     326               0 :   mBoundingMetrics.width = bmSqr.width + bmBase.width;
     327               0 :   mBoundingMetrics.leftBearing = bmSqr.leftBearing;
     328                 :   mBoundingMetrics.rightBearing = bmSqr.width + 
     329               0 :     NS_MAX(bmBase.width, bmBase.rightBearing); // take also care of the rule
     330                 : 
     331               0 :   aDesiredSize.ascent = mBoundingMetrics.ascent + leading;
     332                 :   aDesiredSize.height = aDesiredSize.ascent +
     333                 :     NS_MAX(baseSize.height - baseSize.ascent,
     334               0 :            mBoundingMetrics.descent + ruleThickness);
     335               0 :   aDesiredSize.width = mBoundingMetrics.width;
     336                 : 
     337                 :   /////////////
     338                 :   // Re-adjust the desired size to include the index.
     339                 :   
     340                 :   // the index is raised by some fraction of the height
     341                 :   // of the radical, see \mroot macro in App. B, TexBook
     342               0 :   nscoord raiseIndexDelta = NSToCoordRound(0.6f * (bmSqr.ascent + bmSqr.descent));
     343                 :   nscoord indexRaisedAscent = mBoundingMetrics.ascent // top of radical 
     344                 :     - (bmSqr.ascent + bmSqr.descent) // to bottom of radical
     345               0 :     + raiseIndexDelta + bmIndex.ascent + bmIndex.descent; // to top of raised index
     346                 : 
     347               0 :   nscoord indexClearance = 0;
     348               0 :   if (mBoundingMetrics.ascent < indexRaisedAscent) {
     349                 :     indexClearance = 
     350               0 :       indexRaisedAscent - mBoundingMetrics.ascent; // excess gap introduced by a tall index 
     351               0 :     mBoundingMetrics.ascent = indexRaisedAscent;
     352               0 :     nscoord descent = aDesiredSize.height - aDesiredSize.ascent;
     353               0 :     aDesiredSize.ascent = mBoundingMetrics.ascent + leading;
     354               0 :     aDesiredSize.height = aDesiredSize.ascent + descent;
     355                 :   }
     356                 : 
     357                 :   nscoord dxIndex, dxSqr;
     358               0 :   GetRadicalXOffsets(bmIndex.width, bmSqr.width, fm, &dxIndex, &dxSqr);
     359                 : 
     360               0 :   mBoundingMetrics.width = dxSqr + bmSqr.width + bmBase.width;
     361                 :   mBoundingMetrics.leftBearing = 
     362               0 :     NS_MIN(dxIndex + bmIndex.leftBearing, dxSqr + bmSqr.leftBearing);
     363                 :   mBoundingMetrics.rightBearing = dxSqr + bmSqr.width +
     364               0 :     NS_MAX(bmBase.width, bmBase.rightBearing);
     365                 : 
     366               0 :   aDesiredSize.width = mBoundingMetrics.width;
     367               0 :   aDesiredSize.mBoundingMetrics = mBoundingMetrics;
     368               0 :   GatherAndStoreOverflow(&aDesiredSize);
     369                 : 
     370                 :   // place the index
     371               0 :   nscoord dx = dxIndex;
     372               0 :   nscoord dy = aDesiredSize.ascent - (indexRaisedAscent + indexSize.ascent - bmIndex.ascent);
     373                 :   FinishReflowChild(indexFrame, aPresContext, nsnull, indexSize,
     374                 :                     MirrorIfRTL(aDesiredSize.width, indexSize.width, dx),
     375               0 :                     dy, 0);
     376                 : 
     377                 :   // place the radical symbol and the radical bar
     378               0 :   dx = dxSqr;
     379               0 :   dy = indexClearance + leading; // leave a leading at the top
     380                 :   mSqrChar.SetRect(nsRect(MirrorIfRTL(aDesiredSize.width, bmSqr.width, dx),
     381               0 :                           dy, bmSqr.width, bmSqr.ascent + bmSqr.descent));
     382               0 :   dx += bmSqr.width;
     383                 :   mBarRect.SetRect(MirrorIfRTL(aDesiredSize.width, bmBase.width, dx),
     384               0 :                    dy, bmBase.width, ruleThickness);
     385                 : 
     386                 :   // place the base
     387               0 :   dy = aDesiredSize.ascent - baseSize.ascent;
     388                 :   FinishReflowChild(baseFrame, aPresContext, nsnull, baseSize,
     389                 :                     MirrorIfRTL(aDesiredSize.width, baseSize.width, dx),
     390               0 :                     dy, 0);
     391                 : 
     392               0 :   mReference.x = 0;
     393               0 :   mReference.y = aDesiredSize.ascent;
     394                 : 
     395               0 :   aStatus = NS_FRAME_COMPLETE;
     396               0 :   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
     397               0 :   return NS_OK;
     398                 : }
     399                 : 
     400                 : /* virtual */ nscoord
     401               0 : nsMathMLmrootFrame::GetIntrinsicWidth(nsRenderingContext* aRenderingContext)
     402                 : {
     403               0 :   nsIFrame* baseFrame = mFrames.FirstChild();
     404               0 :   nsIFrame* indexFrame = nsnull;
     405               0 :   if (baseFrame)
     406               0 :     indexFrame = baseFrame->GetNextSibling();
     407               0 :   if (!indexFrame || indexFrame->GetNextSibling()) {
     408               0 :     nsHTMLReflowMetrics desiredSize;
     409               0 :     ReflowError(*aRenderingContext, desiredSize);
     410               0 :     return desiredSize.width;
     411                 :   }
     412                 : 
     413                 :   nscoord baseWidth =
     414                 :     nsLayoutUtils::IntrinsicForContainer(aRenderingContext, baseFrame,
     415               0 :                                          nsLayoutUtils::PREF_WIDTH);
     416                 :   nscoord indexWidth =
     417                 :     nsLayoutUtils::IntrinsicForContainer(aRenderingContext, indexFrame,
     418               0 :                                          nsLayoutUtils::PREF_WIDTH);
     419               0 :   nscoord sqrWidth = mSqrChar.GetMaxWidth(PresContext(), *aRenderingContext);
     420                 : 
     421                 :   nscoord dxSqr;
     422                 :   GetRadicalXOffsets(indexWidth, sqrWidth, aRenderingContext->FontMetrics(),
     423               0 :                      nsnull, &dxSqr);
     424                 : 
     425               0 :   return dxSqr + sqrWidth + baseWidth;
     426                 : }
     427                 : 
     428                 : // ----------------------
     429                 : // the Style System will use these to pass the proper style context to our MathMLChar
     430                 : nsStyleContext*
     431               0 : nsMathMLmrootFrame::GetAdditionalStyleContext(PRInt32 aIndex) const
     432                 : {
     433               0 :   switch (aIndex) {
     434                 :   case NS_SQR_CHAR_STYLE_CONTEXT_INDEX:
     435               0 :     return mSqrChar.GetStyleContext();
     436                 :     break;
     437                 :   default:
     438               0 :     return nsnull;
     439                 :   }
     440                 : }
     441                 : 
     442                 : void
     443               0 : nsMathMLmrootFrame::SetAdditionalStyleContext(PRInt32          aIndex, 
     444                 :                                               nsStyleContext*  aStyleContext)
     445                 : {
     446               0 :   switch (aIndex) {
     447                 :   case NS_SQR_CHAR_STYLE_CONTEXT_INDEX:
     448               0 :     mSqrChar.SetStyleContext(aStyleContext);
     449               0 :     break;
     450                 :   }
     451               0 : }

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