241 lines
8.1 KiB
C++
241 lines
8.1 KiB
C++
/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 The University Of
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* Queensland. Portions created by The University Of Queensland are
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* Copyright (C) 1999 The University Of Queensland. 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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*/
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#include "nsCOMPtr.h"
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#include "nsHTMLParts.h"
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#include "nsIHTMLContent.h"
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#include "nsFrame.h"
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#include "nsLineLayout.h"
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#include "nsHTMLIIDs.h"
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#include "nsIPresContext.h"
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#include "nsHTMLAtoms.h"
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#include "nsUnitConversion.h"
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#include "nsIStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsINameSpaceManager.h"
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#include "nsIRenderingContext.h"
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#include "nsIFontMetrics.h"
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#include "nsStyleUtil.h"
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#include "nsMathMLAtoms.h"
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#include "nsMathMLParts.h"
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#include "nsMathMLmmultiscriptsFrame.h"
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//
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// <mmultiscripts> -- attach prescripts and tensor indices to a base - implementation
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//
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nsresult
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NS_NewMathMLmmultiscriptsFrame(nsIFrame** aNewFrame)
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{
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NS_PRECONDITION(aNewFrame, "null OUT ptr");
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if (nsnull == aNewFrame) {
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return NS_ERROR_NULL_POINTER;
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}
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nsMathMLmmultiscriptsFrame* it = new nsMathMLmmultiscriptsFrame;
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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*aNewFrame = it;
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return NS_OK;
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}
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nsMathMLmmultiscriptsFrame::nsMathMLmmultiscriptsFrame()
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{
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}
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nsMathMLmmultiscriptsFrame::~nsMathMLmmultiscriptsFrame()
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{
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}
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NS_IMETHODIMP
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nsMathMLmmultiscriptsFrame::Reflow(nsIPresContext& 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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nsReflowStatus childStatus;
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nsHTMLReflowMetrics childDesiredSize(aDesiredSize.maxElementSize);
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nsSize availSize(aReflowState.mComputedWidth, aReflowState.mComputedHeight);
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//////////////////
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// Reflow Children
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nsIFrame* mprescriptsFrame = nsnull; // frame of <mprescripts/>, if there.
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PRBool isSubscript = PR_FALSE;
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nscoord ascent, descent, width, height;
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nscoord subsupWidth, subHeight, supHeight, subDescent, supAscent;
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nscoord count = 0;
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nsIFrame* baseFrame = nsnull;
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nsIFrame* childFrame = mFrames.FirstChild();
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while (nsnull != childFrame)
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{
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//////////////
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// WHITESPACE: don't forget that whitespace doesn't count in MathML!
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if (IsOnlyWhitespace(childFrame)) {
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ReflowEmptyChild(childFrame);
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}
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else {
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nsCOMPtr<nsIContent> childContent;
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nsCOMPtr<nsIAtom> childTag;
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childFrame->GetContent(getter_AddRefs(childContent));
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childContent->GetTag(*getter_AddRefs(childTag));
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if (childTag == nsMathMLAtoms::mprescripts) {
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// NS_ASSERTION(mprescriptsFrame == nsnull,"duplicate <mprescripts/>");
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//printf("mprescripts Found ...\n"); // should ignore?
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mprescriptsFrame = childFrame;
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}
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else if (childTag == nsMathMLAtoms::none) {
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childDesiredSize.height = 0;
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childDesiredSize.width = 0;
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childDesiredSize.ascent = 0;
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childDesiredSize.descent = 0;
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}
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else {
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//printf("child count: %d...\n", count);
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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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return rv;
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}
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if (0 == count) {
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baseFrame = childFrame;
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ascent = childDesiredSize.ascent;
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descent = childDesiredSize.descent;
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height = childDesiredSize.height;
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subsupWidth = childDesiredSize.width;
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subHeight = supHeight = height;
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supAscent = ascent;
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subDescent = descent;
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}
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else {
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if (isSubscript) {
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subDescent = PR_MAX(subDescent, childDesiredSize.descent);
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subHeight = PR_MAX(subHeight, childDesiredSize.height);
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width = childDesiredSize.width;
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}
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else {
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supAscent = PR_MAX(supAscent, childDesiredSize.ascent);
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supHeight = PR_MAX(supHeight, childDesiredSize.height);
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width = PR_MAX(width, childDesiredSize.width);
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subsupWidth += width;
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}
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}
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// At this stage, the origin points of the children have no use, so we will use the
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// origins to store the child's ascent and descent. At the next pass, we should
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// set the origins so as to overwrite what we are storing there now
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childFrame->SetRect(nsRect(childDesiredSize.descent, childDesiredSize.ascent,
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childDesiredSize.width, childDesiredSize.height));
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isSubscript = !isSubscript;
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count++;
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}
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}
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rv = childFrame->GetNextSibling(&childFrame);
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NS_ASSERTION(NS_SUCCEEDED(rv),"failed to get next child");
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}
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//////////////////
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// Place Children
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// Get the subscript and superscript offsets
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nscoord subscriptOffset, superscriptOffset, leading;
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nsCOMPtr<nsIFontMetrics> fm;
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const nsStyleFont* aFont =
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(const nsStyleFont*)mStyleContext->GetStyleData(eStyleStruct_Font);
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aPresContext.GetMetricsFor(aFont->mFont, getter_AddRefs(fm));
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fm->GetSubscriptOffset(subscriptOffset);
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fm->GetSuperscriptOffset(superscriptOffset);
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fm->GetLeading(leading);
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subHeight = PR_MAX(height, subHeight) + subscriptOffset + leading;
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supHeight = PR_MAX(height, supHeight) + superscriptOffset;
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aDesiredSize.descent = subHeight - ascent;
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aDesiredSize.ascent = supHeight - descent;
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aDesiredSize.height = aDesiredSize.descent + aDesiredSize.ascent;
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aDesiredSize.width = subsupWidth;
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// Place prescripts, followed by base, and then postscripts.
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// The list of frames is in the order: {base} {postscripts} {prescripts}
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// We go over the list in a circular manner, starting at <prescripts/>
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nscoord offset = 0;
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nsIFrame* child[2];
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nsRect rect[2];
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count = 0;
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childFrame = mprescriptsFrame;
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do {
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if (nsnull == childFrame) { // end of prescripts,
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//printf("Placing the base ...\n");
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childFrame = baseFrame; // place the base
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childFrame->GetRect(rect[0]);
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rect[0].x = offset;
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rect[0].y = aDesiredSize.height - subHeight;
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childFrame->SetRect(rect[0]);
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offset += rect[0].width;
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}
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else if (mprescriptsFrame != childFrame) {
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//////////////
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// WHITESPACE: whitespace doesn't count. Iteration over non empty frames
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if (!IsOnlyWhitespace(childFrame)) {
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child[count++] = childFrame;
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if (2 == count) { // place a sub-sup pair
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count = 0;
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//printf("Placing the sub-sup pair...\n");
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child[0]->GetRect(rect[0]);
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child[1]->GetRect(rect[1]);
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rect[0].y = aDesiredSize.height - (subDescent + rect[0].y);
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rect[1].y = supAscent - rect[1].y;
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width = PR_MAX(rect[0].width, rect[1].width);
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rect[0].x = offset + (width - rect[0].width) / 2; // centering
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rect[1].x = offset + (width - rect[1].width) / 2;
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child[0]->SetRect(rect[0]);
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child[1]->SetRect(rect[1]);
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offset += width;
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}
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}
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}
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rv = childFrame->GetNextSibling(&childFrame);
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NS_ASSERTION(NS_SUCCEEDED(rv),"failed to get next child");
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} while (mprescriptsFrame != childFrame);
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if (nsnull != aDesiredSize.maxElementSize) {
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aDesiredSize.maxElementSize->width = aDesiredSize.width;
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aDesiredSize.maxElementSize->height = aDesiredSize.height;
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}
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aStatus = NS_FRAME_COMPLETE;
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return rv;
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}
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