420 lines
14 KiB
C++
420 lines
14 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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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* 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 "nsUnitConversion.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 "nsIDOMText.h"
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#include "nsITextContent.h"
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#include "nsFrameManager.h"
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#include "nsLayoutAtoms.h"
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#include "nsStyleChangeList.h"
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#include "nsINameSpaceManager.h"
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#include "nsMathMLTokenFrame.h"
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nsIFrame*
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NS_NewMathMLTokenFrame(nsIPresShell* aPresShell)
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{
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return new (aPresShell) nsMathMLTokenFrame;
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}
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nsMathMLTokenFrame::nsMathMLTokenFrame()
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{
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}
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nsMathMLTokenFrame::~nsMathMLTokenFrame()
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{
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}
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nsIAtom*
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nsMathMLTokenFrame::GetType() const
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{
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// treat everything other than <mi> as ordinary...
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if (mContent->Tag() != nsMathMLAtoms::mi_) {
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return nsMathMLAtoms::ordinaryMathMLFrame;
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}
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// for <mi>, distinguish between italic and upright...
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nsAutoString value;
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mContent->GetAttr(kNameSpaceID_None, nsMathMLAtoms::MOZfontstyle, value);
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// treat invariant the same as italic to inherit its inter-space properties
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return value.EqualsLiteral("normal")
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? nsMathMLAtoms::uprightIdentifierMathMLFrame
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: nsMathMLAtoms::italicIdentifierMathMLFrame;
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}
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static void
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CompressWhitespace(nsIContent* aContent)
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{
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PRUint32 numKids = aContent->GetChildCount();
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for (PRUint32 kid = 0; kid < numKids; kid++) {
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nsCOMPtr<nsITextContent> tc(do_QueryInterface(aContent->GetChildAt(kid)));
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if (tc && tc->IsContentOfType(nsIContent::eTEXT)) {
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nsAutoString text;
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tc->AppendTextTo(text);
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text.CompressWhitespace();
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tc->SetText(text, PR_FALSE); // not meant to be used if notify is needed
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}
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}
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::Init(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aParent,
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nsStyleContext* aContext,
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nsIFrame* aPrevInFlow)
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{
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// leading and trailing whitespace doesn't count -- bug 15402
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// brute force removal for people who do <mi> a </mi> instead of <mi>a</mi>
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// XXX the best fix is to skip these in nsTextFrame
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CompressWhitespace(aContent);
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// let the base class do its Init()
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return nsMathMLContainerFrame::Init(aPresContext, aContent, aParent, aContext, aPrevInFlow);
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::SetInitialChildList(nsPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame* 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(aPresContext, aListName, aChildList);
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if (NS_FAILED(rv))
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return rv;
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// Safety measure to cater for math fonts with metrics that sometimes
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// cause glyphs in the text frames to protrude outside. Without this,
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// such glyphs may be clipped at the painting stage
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mState |= NS_FRAME_OUTSIDE_CHILDREN;
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nsIFrame* childFrame = mFrames.FirstChild();
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while (childFrame) {
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childFrame->AddStateBits(NS_FRAME_OUTSIDE_CHILDREN);
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childFrame = childFrame->GetNextSibling();
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}
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SetQuotes(aPresContext);
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ProcessTextData(aPresContext);
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return rv;
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}
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nsresult
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nsMathMLTokenFrame::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 = NS_OK;
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// See if this is an incremental reflow
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if (aReflowState.reason == eReflowReason_Incremental) {
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#ifdef MATHML_NOISY_INCREMENTAL_REFLOW
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printf("nsMathMLContainerFrame::ReflowTokenFor:IncrementalReflow received by: ");
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nsFrame::ListTag(stdout, aFrame);
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printf("\n");
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#endif
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}
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// initializations needed for empty markup like <mtag></mtag>
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aDesiredSize.width = aDesiredSize.height = 0;
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aDesiredSize.ascent = aDesiredSize.descent = 0;
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aDesiredSize.mBoundingMetrics.Clear();
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// ask our children to compute their bounding metrics
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nsHTMLReflowMetrics childDesiredSize(aDesiredSize.mComputeMEW,
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aDesiredSize.mFlags | NS_REFLOW_CALC_BOUNDING_METRICS);
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nsSize availSize(aReflowState.mComputedWidth, aReflowState.mComputedHeight);
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PRInt32 count = 0;
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nsIFrame* childFrame = GetFirstChild(nsnull);
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while (childFrame) {
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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, aStatus);
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//NS_ASSERTION(NS_FRAME_IS_COMPLETE(aStatus), "bad status");
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if (NS_FAILED(rv)) return rv;
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// origins are used as placeholders to store the child's ascent and descent.
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childFrame->SetRect(nsRect(childDesiredSize.descent, childDesiredSize.ascent,
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childDesiredSize.width, childDesiredSize.height));
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// compute and cache the bounding metrics
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if (0 == count)
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aDesiredSize.mBoundingMetrics = childDesiredSize.mBoundingMetrics;
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else
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aDesiredSize.mBoundingMetrics += childDesiredSize.mBoundingMetrics;
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count++;
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childFrame = childFrame->GetNextSibling();
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}
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if (aDesiredSize.mComputeMEW) {
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aDesiredSize.mMaxElementWidth = childDesiredSize.mMaxElementWidth;
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}
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FinishAndStoreOverflow(&aDesiredSize);
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// Act as if there is overflow no matter what. This is a
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// safety measure to cater for math fonts with metrics that sometimes
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// cause glyphs in the text frames to protrude outside. Without this,
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// such glyphs may be clipped at the painting stage
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// This flag has already been set on the children as well in
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// SetInitialChildList()
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mState |= NS_FRAME_OUTSIDE_CHILDREN;
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// cache the frame's mBoundingMetrics
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mBoundingMetrics = aDesiredSize.mBoundingMetrics;
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// place and size children
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FinalizeReflow(*aReflowState.rendContext, 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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// For token elements, mBoundingMetrics is computed at the ReflowToken
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// pass, it is not computed here because our children may be text frames
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// that do not implement the GetBoundingMetrics() interface.
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nsresult
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nsMathMLTokenFrame::Place(nsIRenderingContext& aRenderingContext,
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PRBool aPlaceOrigin,
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nsHTMLReflowMetrics& aDesiredSize)
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{
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nsCOMPtr<nsIFontMetrics> fm =
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GetPresContext()->GetMetricsFor(GetStyleFont()->mFont);
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nscoord ascent, descent;
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fm->GetMaxAscent(ascent);
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fm->GetMaxDescent(descent);
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
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aDesiredSize.width = mBoundingMetrics.width;
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aDesiredSize.ascent = PR_MAX(mBoundingMetrics.ascent, ascent);
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aDesiredSize.descent = PR_MAX(mBoundingMetrics.descent, descent);
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aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
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if (aPlaceOrigin) {
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nscoord dy, dx = 0;
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nsIFrame* childFrame = GetFirstChild(nsnull);
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while (childFrame) {
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nsRect rect = childFrame->GetRect();
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nsHTMLReflowMetrics childSize(nsnull);
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childSize.width = rect.width;
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childSize.height = aDesiredSize.height; //rect.height;
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// place and size the child; (dx,0) makes the caret happy - bug 188146
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dy = rect.IsEmpty() ? 0 : aDesiredSize.ascent - rect.y;
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FinishReflowChild(childFrame, GetPresContext(), nsnull, childSize, dx, dy, 0);
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dx += rect.width;
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childFrame = childFrame->GetNextSibling();
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}
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}
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SetReference(nsPoint(0, aDesiredSize.ascent));
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::ReflowDirtyChild(nsIPresShell* aPresShell,
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nsIFrame* aChild)
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{
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// if we get this, it means it was called by the nsTextFrame beneath us, and
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// this means something changed in the text content. So re-process our text
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ProcessTextData(aPresShell->GetPresContext());
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mState |= NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN;
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return mParent->ReflowDirtyChild(aPresShell, this);
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::AttributeChanged(PRInt32 aNameSpaceID,
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nsIAtom* aAttribute,
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PRInt32 aModType)
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{
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if (nsMathMLAtoms::lquote_ == aAttribute ||
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nsMathMLAtoms::rquote_ == aAttribute) {
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SetQuotes(GetPresContext());
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}
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return nsMathMLContainerFrame::
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AttributeChanged(aNameSpaceID, aAttribute, aModType);
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}
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void
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nsMathMLTokenFrame::ProcessTextData(nsPresContext* aPresContext)
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{
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SetTextStyle(aPresContext);
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}
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///////////////////////////////////////////////////////////////////////////
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// For <mi>, if the content is not a single character, turn the font to
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// normal (this function will also query attributes from the mstyle hierarchy)
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void
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nsMathMLTokenFrame::SetTextStyle(nsPresContext* aPresContext)
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{
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if (mContent->Tag() != nsMathMLAtoms::mi_)
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return;
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if (!mFrames.FirstChild())
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return;
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// Get the text content that we enclose and its length
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// our content can include comment-nodes, attribute-nodes, text-nodes...
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// we use the DOM to make sure that we are only looking at text-nodes...
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nsAutoString data;
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PRUint32 numKids = mContent->GetChildCount();
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for (PRUint32 kid = 0; kid < numKids; kid++) {
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nsCOMPtr<nsIDOMText> kidText(do_QueryInterface(mContent->GetChildAt(kid)));
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if (kidText) {
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nsAutoString kidData;
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kidText->GetData(kidData);
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data += kidData;
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}
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}
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PRInt32 length = data.Length();
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if (!length)
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return;
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// attributes may override the default behavior
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nsAutoString fontstyle;
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GetAttribute(mContent, mPresentationData.mstyle, nsMathMLAtoms::fontstyle_, fontstyle);
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if (1 == length && nsMathMLOperators::LookupInvariantChar(data[0])) {
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// bug 65951 - a non-stylable character has its own intrinsic appearance
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fontstyle.AssignLiteral("invariant");
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}
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if (fontstyle.IsEmpty()) {
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fontstyle.AssignASCII((1 == length) ? "italic" : "normal");
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}
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// set the -moz-math-font-style attribute without notifying that we want a reflow
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mContent->SetAttr(kNameSpaceID_None, nsMathMLAtoms::MOZfontstyle, fontstyle, PR_FALSE);
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// then, re-resolve the style contexts in our subtree
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nsFrameManager *fm = aPresContext->FrameManager();
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nsStyleChangeList changeList;
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fm->ComputeStyleChangeFor(this, &changeList, NS_STYLE_HINT_NONE);
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#ifdef DEBUG
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// Use the parent frame to make sure we catch in-flows and such
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nsIFrame* parentFrame = GetParent();
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fm->DebugVerifyStyleTree(parentFrame ? parentFrame : this);
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#endif
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}
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///////////////////////////////////////////////////////////////////////////
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// For <ms>, it is assumed that the mathml.css file contains two rules:
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// ms:before { content: open-quote; }
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// ms:after { content: close-quote; }
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// With these two rules, the frame construction code will
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// create inline frames that contain text frames which themselves
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// contain the text content of the quotes.
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// So the main idea in this code is to see if there are lquote and
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// rquote attributes. If these are there, we ovewrite the default
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// quotes in the text frames.
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//
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// But what if the mathml.css file wasn't loaded?
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// We also check that we are not relying on null pointers...
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static void
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SetQuote(nsPresContext* aPresContext,
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nsIFrame* aFrame,
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nsString& aValue)
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{
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nsIFrame* textFrame;
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do {
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// walk down the hierarchy of first children because they could be wrapped
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textFrame = aFrame->GetFirstChild(nsnull);
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if (textFrame) {
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if (textFrame->GetType() == nsLayoutAtoms::textFrame)
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break;
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}
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aFrame = textFrame;
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} while (textFrame);
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if (textFrame) {
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nsIContent* quoteContent = textFrame->GetContent();
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if (quoteContent) {
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nsCOMPtr<nsIDOMText> domText(do_QueryInterface(quoteContent));
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if (domText) {
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nsCOMPtr<nsITextContent> tc(do_QueryInterface(quoteContent));
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if (tc) {
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tc->SetText(aValue, PR_FALSE); // no notify since we don't want a reflow yet
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}
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}
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}
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}
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}
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void
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nsMathMLTokenFrame::SetQuotes(nsPresContext* aPresContext)
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{
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if (mContent->Tag() != nsMathMLAtoms::ms_)
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return;
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nsIFrame* rightFrame = nsnull;
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nsIFrame* baseFrame = nsnull;
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nsIFrame* leftFrame = mFrames.FirstChild();
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if (leftFrame)
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baseFrame = leftFrame->GetNextSibling();
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if (baseFrame)
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rightFrame = baseFrame->GetNextSibling();
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if (!leftFrame || !baseFrame || !rightFrame)
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return;
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nsAutoString value;
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// lquote
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if (GetAttribute(mContent, mPresentationData.mstyle,
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nsMathMLAtoms::lquote_, value)) {
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SetQuote(aPresContext, leftFrame, value);
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}
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// rquote
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if (GetAttribute(mContent, mPresentationData.mstyle,
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nsMathMLAtoms::rquote_, value)) {
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SetQuote(aPresContext, rightFrame, value);
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}
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}
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