зеркало из https://github.com/mozilla/pjs.git
720 строки
24 KiB
C++
720 строки
24 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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* Pierre Phaneuf <pp@ludusdesign.com>
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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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#include "nsCOMPtr.h"
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#include "nsFrame.h"
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#include "nsPresContext.h"
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#include "nsStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsIRenderingContext.h"
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#include "nsIFontMetrics.h"
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#include "nsMathMLmfencedFrame.h"
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//
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// <mfenced> -- surround content with a pair of fences
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//
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nsIFrame*
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NS_NewMathMLmfencedFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsMathMLmfencedFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmfencedFrame)
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nsMathMLmfencedFrame::~nsMathMLmfencedFrame()
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{
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RemoveFencesAndSeparators();
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}
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NS_IMETHODIMP
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nsMathMLmfencedFrame::InheritAutomaticData(nsIFrame* aParent)
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{
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// let the base class get the default from our parent
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nsMathMLContainerFrame::InheritAutomaticData(aParent);
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mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmfencedFrame::SetInitialChildList(nsIAtom* aListName,
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nsFrameList& aChildList)
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{
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// First, let the base class do its work
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nsresult rv = nsMathMLContainerFrame::SetInitialChildList(aListName, aChildList);
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if (NS_FAILED(rv)) return rv;
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// No need to track the style contexts given to our MathML chars.
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// The Style System will use Get/SetAdditionalStyleContext() to keep them
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// up-to-date if dynamic changes arise.
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CreateFencesAndSeparators(PresContext());
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmfencedFrame::AttributeChanged(PRInt32 aNameSpaceID,
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nsIAtom* aAttribute,
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PRInt32 aModType)
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{
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RemoveFencesAndSeparators();
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CreateFencesAndSeparators(PresContext());
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return nsMathMLContainerFrame::
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AttributeChanged(aNameSpaceID, aAttribute, aModType);
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}
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nsresult
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nsMathMLmfencedFrame::ChildListChanged(PRInt32 aModType)
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{
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RemoveFencesAndSeparators();
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CreateFencesAndSeparators(PresContext());
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return nsMathMLContainerFrame::ChildListChanged(aModType);
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}
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void
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nsMathMLmfencedFrame::RemoveFencesAndSeparators()
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{
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if (mOpenChar) delete mOpenChar;
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if (mCloseChar) delete mCloseChar;
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if (mSeparatorsChar) delete[] mSeparatorsChar;
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mOpenChar = nsnull;
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mCloseChar = nsnull;
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mSeparatorsChar = nsnull;
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mSeparatorsCount = 0;
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}
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void
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nsMathMLmfencedFrame::CreateFencesAndSeparators(nsPresContext* aPresContext)
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{
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nsAutoString value;
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PRBool isMutable = PR_FALSE;
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//////////////
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// see if the opening fence is there ...
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if (!GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::open,
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value)) {
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value = PRUnichar('('); // default as per the MathML REC
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} else {
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value.CompressWhitespace();
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}
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if (!value.IsEmpty()) {
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mOpenChar = new nsMathMLChar;
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mOpenChar->SetData(aPresContext, value);
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isMutable = nsMathMLOperators::IsMutableOperator(value);
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ResolveMathMLCharStyle(aPresContext, mContent, mStyleContext, mOpenChar, isMutable);
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}
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//////////////
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// see if the closing fence is there ...
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if(!GetAttribute(mContent, mPresentationData.mstyle,
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nsGkAtoms::close, value)) {
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value = PRUnichar(')'); // default as per the MathML REC
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} else {
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value.CompressWhitespace();
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}
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if (!value.IsEmpty()) {
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mCloseChar = new nsMathMLChar;
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mCloseChar->SetData(aPresContext, value);
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isMutable = nsMathMLOperators::IsMutableOperator(value);
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ResolveMathMLCharStyle(aPresContext, mContent, mStyleContext, mCloseChar, isMutable);
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}
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//////////////
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// see if separators are there ...
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if (!GetAttribute(mContent, mPresentationData.mstyle,
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nsGkAtoms::separators_, value)) {
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value = PRUnichar(','); // default as per the MathML REC
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} else {
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value.StripWhitespace();
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}
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mSeparatorsCount = value.Length();
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if (0 < mSeparatorsCount) {
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PRInt32 sepCount = mFrames.GetLength() - 1;
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if (0 < sepCount) {
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mSeparatorsChar = new nsMathMLChar[sepCount];
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nsAutoString sepChar;
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for (PRInt32 i = 0; i < sepCount; i++) {
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if (i < mSeparatorsCount) {
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sepChar = value[i];
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isMutable = nsMathMLOperators::IsMutableOperator(sepChar);
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}
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else {
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sepChar = value[mSeparatorsCount-1];
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// keep the value of isMutable that was set earlier
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}
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mSeparatorsChar[i].SetData(aPresContext, sepChar);
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ResolveMathMLCharStyle(aPresContext, mContent, mStyleContext, &mSeparatorsChar[i], isMutable);
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}
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mSeparatorsCount = sepCount;
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} else {
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// No separators. Note that sepCount can be -1 here, so don't
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// set mSeparatorsCount to it.
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mSeparatorsCount = 0;
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}
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}
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}
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NS_IMETHODIMP
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nsMathMLmfencedFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists)
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{
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/////////////
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// display the content
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nsresult rv = nsMathMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
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NS_ENSURE_SUCCESS(rv, rv);
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////////////
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// display fences and separators
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if (mOpenChar) {
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rv = mOpenChar->Display(aBuilder, this, aLists);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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if (mCloseChar) {
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rv = mCloseChar->Display(aBuilder, this, aLists);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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for (PRInt32 i = 0; i < mSeparatorsCount; i++) {
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rv = mSeparatorsChar[i].Display(aBuilder, this, aLists);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmfencedFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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nsresult rv;
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aDesiredSize.width = aDesiredSize.height = 0;
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aDesiredSize.ascent = 0;
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aDesiredSize.mBoundingMetrics.Clear();
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PRInt32 i;
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nsCOMPtr<nsIFontMetrics> fm;
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const nsStyleFont* font = GetStyleFont();
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aReflowState.rendContext->SetFont(font->mFont,
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aPresContext->GetUserFontSet());
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aReflowState.rendContext->GetFontMetrics(*getter_AddRefs(fm));
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nscoord axisHeight, em;
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GetAxisHeight(*aReflowState.rendContext, fm, axisHeight);
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GetEmHeight(fm, em);
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// leading to be left at the top and the bottom of stretched chars
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nscoord leading = NSToCoordRound(0.2f * em);
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/////////////
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// Reflow children
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// Asking each child to cache its bounding metrics
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// Note that we don't use the base method nsMathMLContainerFrame::Reflow()
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// because we want to stretch our fences, separators and stretchy frames using
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// the *same* initial aDesiredSize.mBoundingMetrics. If we were to use the base
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// method here, our stretchy frames will be stretched and placed, and we may
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// end up stretching our fences/separators with a different aDesiredSize.
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// XXX The above decision was revisited in bug 121748 and this code can be
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// refactored to use nsMathMLContainerFrame::Reflow() at some stage.
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nsReflowStatus childStatus;
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nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
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nsIFrame* firstChild = GetFirstChild(nsnull);
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nsIFrame* childFrame = firstChild;
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nscoord ascent = 0, descent = 0;
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if (firstChild || mOpenChar || mCloseChar || mSeparatorsCount > 0) {
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// We use the ASCII metrics to get our minimum height. This way, if we have
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// borders or a background, they will fit better with other elements on the line
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fm->GetMaxAscent(ascent);
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fm->GetMaxDescent(descent);
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}
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while (childFrame) {
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nsHTMLReflowMetrics childDesiredSize(aDesiredSize.mFlags
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| NS_REFLOW_CALC_BOUNDING_METRICS);
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nsHTMLReflowState childReflowState(aPresContext, aReflowState,
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childFrame, availSize);
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rv = ReflowChild(childFrame, aPresContext, childDesiredSize,
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childReflowState, childStatus);
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//NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status");
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if (NS_FAILED(rv)) {
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// Call DidReflow() for the child frames we successfully did reflow.
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DidReflowChildren(firstChild, childFrame);
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return rv;
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}
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SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
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childDesiredSize.mBoundingMetrics);
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nscoord childDescent = childDesiredSize.height - childDesiredSize.ascent;
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if (descent < childDescent)
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descent = childDescent;
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if (ascent < childDesiredSize.ascent)
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ascent = childDesiredSize.ascent;
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childFrame = childFrame->GetNextSibling();
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}
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/////////////
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// Ask stretchy children to stretch themselves
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nsBoundingMetrics containerSize;
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nsStretchDirection stretchDir = NS_STRETCH_DIRECTION_VERTICAL;
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nsPresentationData presentationData;
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GetPresentationData(presentationData);
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GetPreferredStretchSize(*aReflowState.rendContext,
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0, /* i.e., without embellishments */
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stretchDir, containerSize);
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childFrame = firstChild;
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while (childFrame) {
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nsIMathMLFrame* mathmlChild = do_QueryFrame(childFrame);
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if (mathmlChild) {
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nsHTMLReflowMetrics childDesiredSize;
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// retrieve the metrics that was stored at the previous pass
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GetReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
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childDesiredSize.mBoundingMetrics);
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mathmlChild->Stretch(*aReflowState.rendContext,
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stretchDir, containerSize, childDesiredSize);
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// store the updated metrics
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SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
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childDesiredSize.mBoundingMetrics);
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nscoord childDescent = childDesiredSize.height - childDesiredSize.ascent;
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if (descent < childDescent)
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descent = childDescent;
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if (ascent < childDesiredSize.ascent)
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ascent = childDesiredSize.ascent;
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}
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childFrame = childFrame->GetNextSibling();
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}
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// bug 121748: for surrounding fences & separators, use a size that covers everything
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GetPreferredStretchSize(*aReflowState.rendContext,
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STRETCH_CONSIDER_EMBELLISHMENTS,
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stretchDir, containerSize);
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//////////////////////////////////////////
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// Prepare the opening fence, separators, and closing fence, and
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// adjust the origin of children.
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// we need to center around the axis
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if (firstChild) { // do nothing for an empty <mfenced></mfenced>
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nscoord delta = NS_MAX(containerSize.ascent - axisHeight,
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containerSize.descent + axisHeight);
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containerSize.ascent = delta + axisHeight;
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containerSize.descent = delta - axisHeight;
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}
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/////////////////
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// opening fence ...
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ReflowChar(aPresContext, *aReflowState.rendContext, mOpenChar,
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NS_MATHML_OPERATOR_FORM_PREFIX, font->mScriptLevel,
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axisHeight, leading, em, containerSize, ascent, descent);
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/////////////////
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// separators ...
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for (i = 0; i < mSeparatorsCount; i++) {
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ReflowChar(aPresContext, *aReflowState.rendContext, &mSeparatorsChar[i],
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NS_MATHML_OPERATOR_FORM_INFIX, font->mScriptLevel,
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axisHeight, leading, em, containerSize, ascent, descent);
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}
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/////////////////
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// closing fence ...
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ReflowChar(aPresContext, *aReflowState.rendContext, mCloseChar,
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NS_MATHML_OPERATOR_FORM_POSTFIX, font->mScriptLevel,
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axisHeight, leading, em, containerSize, ascent, descent);
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//////////////////
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// Adjust the origins of each child.
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// and update our bounding metrics
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i = 0;
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nscoord dx = 0;
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nsBoundingMetrics bm;
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PRBool firstTime = PR_TRUE;
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if (mOpenChar) {
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PlaceChar(mOpenChar, ascent, bm, dx);
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aDesiredSize.mBoundingMetrics = bm;
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firstTime = PR_FALSE;
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}
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childFrame = firstChild;
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while (childFrame) {
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nsHTMLReflowMetrics childSize;
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GetReflowAndBoundingMetricsFor(childFrame, childSize, bm);
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if (firstTime) {
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firstTime = PR_FALSE;
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aDesiredSize.mBoundingMetrics = bm;
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}
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else
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aDesiredSize.mBoundingMetrics += bm;
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FinishReflowChild(childFrame, aPresContext, nsnull, childSize,
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dx, ascent - childSize.ascent, 0);
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dx += childSize.width;
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if (i < mSeparatorsCount) {
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PlaceChar(&mSeparatorsChar[i], ascent, bm, dx);
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aDesiredSize.mBoundingMetrics += bm;
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}
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i++;
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childFrame = childFrame->GetNextSibling();
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}
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if (mCloseChar) {
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PlaceChar(mCloseChar, ascent, bm, dx);
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if (firstTime)
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aDesiredSize.mBoundingMetrics = bm;
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else
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aDesiredSize.mBoundingMetrics += bm;
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}
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aDesiredSize.width = aDesiredSize.mBoundingMetrics.width;
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aDesiredSize.height = ascent + descent;
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aDesiredSize.ascent = ascent;
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SetBoundingMetrics(aDesiredSize.mBoundingMetrics);
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SetReference(nsPoint(0, aDesiredSize.ascent));
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// see if we should fix the spacing
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FixInterFrameSpacing(aDesiredSize);
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// Finished with these:
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ClearSavedChildMetrics();
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// Set our overflow area
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GatherAndStoreOverflow(&aDesiredSize);
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aStatus = NS_FRAME_COMPLETE;
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
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return NS_OK;
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}
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static void
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GetCharSpacing(nsMathMLChar* aMathMLChar,
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nsOperatorFlags aForm,
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PRInt32 aScriptLevel,
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nscoord em,
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nscoord& aLeftSpace,
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nscoord& aRightSpace)
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{
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nsAutoString data;
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aMathMLChar->GetData(data);
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nsOperatorFlags flags = 0;
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float lspace = 0.0f;
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float rspace = 0.0f;
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PRBool found = nsMathMLOperators::LookupOperator(data, aForm,
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&flags, &lspace, &rspace);
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// We don't want extra space when we are a script
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if (found && aScriptLevel > 0) {
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lspace /= 2.0f;
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rspace /= 2.0f;
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}
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aLeftSpace = NSToCoordRound(lspace * em);
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aRightSpace = NSToCoordRound(rspace * em);
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}
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// helper functions to perform the common task of formatting our chars
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/*static*/ nsresult
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nsMathMLmfencedFrame::ReflowChar(nsPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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nsMathMLChar* aMathMLChar,
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nsOperatorFlags aForm,
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PRInt32 aScriptLevel,
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nscoord axisHeight,
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nscoord leading,
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nscoord em,
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nsBoundingMetrics& aContainerSize,
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nscoord& aAscent,
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nscoord& aDescent)
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{
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if (aMathMLChar && 0 < aMathMLChar->Length()) {
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nscoord leftSpace;
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nscoord rightSpace;
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GetCharSpacing(aMathMLChar, aForm, aScriptLevel, em, leftSpace, rightSpace);
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// stretch the char to the appropriate height if it is not big enough.
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nsBoundingMetrics charSize;
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nsresult res = aMathMLChar->Stretch(aPresContext, aRenderingContext,
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NS_STRETCH_DIRECTION_VERTICAL,
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aContainerSize, charSize);
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|
|
if (NS_STRETCH_DIRECTION_UNSUPPORTED != aMathMLChar->GetStretchDirection()) {
|
|
// has changed... so center the char around the axis
|
|
nscoord height = charSize.ascent + charSize.descent;
|
|
charSize.ascent = height/2 + axisHeight;
|
|
charSize.descent = height - charSize.ascent;
|
|
}
|
|
else {
|
|
// either it hasn't changed or stretching the char failed (i.e.,
|
|
// GetBoundingMetrics failed)
|
|
leading = 0;
|
|
if (NS_FAILED(res)) {
|
|
nsAutoString data;
|
|
aMathMLChar->GetData(data);
|
|
nsTextDimensions dimensions;
|
|
aRenderingContext.GetTextDimensions(data.get(), data.Length(), dimensions);
|
|
charSize.ascent = dimensions.ascent;
|
|
charSize.descent = dimensions.descent;
|
|
charSize.width = dimensions.width;
|
|
// Set this as the bounding metrics of the MathMLChar to leave
|
|
// the necessary room to paint the char.
|
|
aMathMLChar->SetBoundingMetrics(charSize);
|
|
}
|
|
}
|
|
|
|
if (aAscent < charSize.ascent + leading)
|
|
aAscent = charSize.ascent + leading;
|
|
if (aDescent < charSize.descent + leading)
|
|
aDescent = charSize.descent + leading;
|
|
|
|
// account the spacing
|
|
charSize.width += leftSpace + rightSpace;
|
|
|
|
// x-origin is used to store lspace ...
|
|
// y-origin is used to stored the ascent ...
|
|
aMathMLChar->SetRect(nsRect(leftSpace,
|
|
charSize.ascent, charSize.width,
|
|
charSize.ascent + charSize.descent));
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
/*static*/ void
|
|
nsMathMLmfencedFrame::PlaceChar(nsMathMLChar* aMathMLChar,
|
|
nscoord aDesiredAscent,
|
|
nsBoundingMetrics& bm,
|
|
nscoord& dx)
|
|
{
|
|
aMathMLChar->GetBoundingMetrics(bm);
|
|
|
|
// the char's x-origin was used to store lspace ...
|
|
// the char's y-origin was used to store the ascent ...
|
|
// the char's width was used to store the advance with (with spacing) ...
|
|
nsRect rect;
|
|
aMathMLChar->GetRect(rect);
|
|
|
|
nscoord dy = aDesiredAscent - rect.y;
|
|
if (aMathMLChar->GetStretchDirection() != NS_STRETCH_DIRECTION_UNSUPPORTED) {
|
|
// the stretchy char will be centered around the axis
|
|
// so we adjust the returned bounding metrics accordingly
|
|
bm.descent = (bm.ascent + bm.descent) - rect.y;
|
|
bm.ascent = rect.y;
|
|
}
|
|
|
|
aMathMLChar->SetRect(nsRect(dx + rect.x, dy, bm.width, rect.height));
|
|
|
|
bm.leftBearing += rect.x;
|
|
bm.rightBearing += rect.x;
|
|
|
|
// return rect.width since it includes lspace and rspace
|
|
bm.width = rect.width;
|
|
dx += rect.width;
|
|
}
|
|
|
|
static nscoord
|
|
GetMaxCharWidth(nsPresContext* aPresContext,
|
|
nsIRenderingContext* aRenderingContext,
|
|
nsMathMLChar* aMathMLChar,
|
|
nsOperatorFlags aForm,
|
|
PRInt32 aScriptLevel,
|
|
nscoord em)
|
|
{
|
|
nscoord width = aMathMLChar->GetMaxWidth(aPresContext, *aRenderingContext);
|
|
|
|
if (0 < aMathMLChar->Length()) {
|
|
nscoord leftSpace;
|
|
nscoord rightSpace;
|
|
GetCharSpacing(aMathMLChar, aForm, aScriptLevel, em, leftSpace, rightSpace);
|
|
|
|
width += leftSpace + rightSpace;
|
|
}
|
|
|
|
return width;
|
|
}
|
|
|
|
/* virtual */ nscoord
|
|
nsMathMLmfencedFrame::GetIntrinsicWidth(nsIRenderingContext* aRenderingContext)
|
|
{
|
|
nscoord width = 0;
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
const nsStyleFont* font = GetStyleFont();
|
|
nsCOMPtr<nsIFontMetrics> fm = presContext->GetMetricsFor(font->mFont);
|
|
nscoord em;
|
|
GetEmHeight(fm, em);
|
|
|
|
if (mOpenChar) {
|
|
width +=
|
|
GetMaxCharWidth(presContext, aRenderingContext, mOpenChar,
|
|
NS_MATHML_OPERATOR_FORM_PREFIX, font->mScriptLevel, em);
|
|
}
|
|
|
|
PRInt32 i = 0;
|
|
nsIFrame* childFrame = GetFirstChild(nsnull);
|
|
while (childFrame) {
|
|
// XXX This includes margin while Reflow currently doesn't consider
|
|
// margin, so we may end up with too much space, but, with stretchy
|
|
// characters, this is an approximation anyway.
|
|
width += nsLayoutUtils::IntrinsicForContainer(aRenderingContext, childFrame,
|
|
nsLayoutUtils::PREF_WIDTH);
|
|
|
|
if (i < mSeparatorsCount) {
|
|
width +=
|
|
GetMaxCharWidth(presContext, aRenderingContext, &mSeparatorsChar[i],
|
|
NS_MATHML_OPERATOR_FORM_INFIX, font->mScriptLevel, em);
|
|
}
|
|
i++;
|
|
|
|
childFrame = childFrame->GetNextSibling();
|
|
}
|
|
|
|
if (mCloseChar) {
|
|
width +=
|
|
GetMaxCharWidth(presContext, aRenderingContext, mCloseChar,
|
|
NS_MATHML_OPERATOR_FORM_POSTFIX, font->mScriptLevel, em);
|
|
}
|
|
|
|
return width;
|
|
}
|
|
|
|
nscoord
|
|
nsMathMLmfencedFrame::FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize)
|
|
{
|
|
nscoord gap = nsMathMLContainerFrame::FixInterFrameSpacing(aDesiredSize);
|
|
if (!gap) return 0;
|
|
|
|
nsRect rect;
|
|
if (mOpenChar) {
|
|
mOpenChar->GetRect(rect);
|
|
rect.MoveBy(gap, 0);
|
|
mOpenChar->SetRect(rect);
|
|
}
|
|
if (mCloseChar) {
|
|
mCloseChar->GetRect(rect);
|
|
rect.MoveBy(gap, 0);
|
|
mCloseChar->SetRect(rect);
|
|
}
|
|
for (PRInt32 i = 0; i < mSeparatorsCount; i++) {
|
|
mSeparatorsChar[i].GetRect(rect);
|
|
rect.MoveBy(gap, 0);
|
|
mSeparatorsChar[i].SetRect(rect);
|
|
}
|
|
return gap;
|
|
}
|
|
|
|
// ----------------------
|
|
// the Style System will use these to pass the proper style context to our MathMLChar
|
|
nsStyleContext*
|
|
nsMathMLmfencedFrame::GetAdditionalStyleContext(PRInt32 aIndex) const
|
|
{
|
|
PRInt32 openIndex = -1;
|
|
PRInt32 closeIndex = -1;
|
|
PRInt32 lastIndex = mSeparatorsCount-1;
|
|
|
|
if (mOpenChar) {
|
|
lastIndex++;
|
|
openIndex = lastIndex;
|
|
}
|
|
if (mCloseChar) {
|
|
lastIndex++;
|
|
closeIndex = lastIndex;
|
|
}
|
|
if (aIndex < 0 || aIndex > lastIndex) {
|
|
return nsnull;
|
|
}
|
|
|
|
if (aIndex < mSeparatorsCount) {
|
|
return mSeparatorsChar[aIndex].GetStyleContext();
|
|
}
|
|
else if (aIndex == openIndex) {
|
|
return mOpenChar->GetStyleContext();
|
|
}
|
|
else if (aIndex == closeIndex) {
|
|
return mCloseChar->GetStyleContext();
|
|
}
|
|
return nsnull;
|
|
}
|
|
|
|
void
|
|
nsMathMLmfencedFrame::SetAdditionalStyleContext(PRInt32 aIndex,
|
|
nsStyleContext* aStyleContext)
|
|
{
|
|
PRInt32 openIndex = -1;
|
|
PRInt32 closeIndex = -1;
|
|
PRInt32 lastIndex = mSeparatorsCount-1;
|
|
|
|
if (mOpenChar) {
|
|
lastIndex++;
|
|
openIndex = lastIndex;
|
|
}
|
|
if (mCloseChar) {
|
|
lastIndex++;
|
|
closeIndex = lastIndex;
|
|
}
|
|
if (aIndex < 0 || aIndex > lastIndex) {
|
|
return;
|
|
}
|
|
|
|
if (aIndex < mSeparatorsCount) {
|
|
mSeparatorsChar[aIndex].SetStyleContext(aStyleContext);
|
|
}
|
|
else if (aIndex == openIndex) {
|
|
mOpenChar->SetStyleContext(aStyleContext);
|
|
}
|
|
else if (aIndex == closeIndex) {
|
|
mCloseChar->SetStyleContext(aStyleContext);
|
|
}
|
|
}
|