134 lines
3.9 KiB
C++
134 lines
3.9 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 "nsMathMLmsubFrame.h"
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//
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// <msub> -- attach a subscript to a base - implementation
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//
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nsresult
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NS_NewMathMLmsubFrame(nsIPresShell* aPresShell, 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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nsMathMLmsubFrame* it = new (aPresShell) nsMathMLmsubFrame;
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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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nsMathMLmsubFrame::nsMathMLmsubFrame()
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{
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}
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nsMathMLmsubFrame::~nsMathMLmsubFrame()
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{
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}
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NS_IMETHODIMP
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nsMathMLmsubFrame::Place(nsIPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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PRBool aPlaceOrigin,
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nsHTMLReflowMetrics& aDesiredSize)
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{
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nscoord count = 0;
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nsRect rect[2];
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nsIFrame* child[2];
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nsIFrame* childFrame = mFrames.FirstChild();
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while (childFrame) {
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if (!IsOnlyWhitespace(childFrame) && 2 > count) {
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childFrame->GetRect(rect[count]);
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child[count] = childFrame;
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count++;
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}
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childFrame->GetNextSibling(&childFrame);
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}
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aDesiredSize.ascent = rect[0].y;
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// Get the subscript offset
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nscoord subscriptOffset, 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->GetLeading(leading);
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// XXX temporary hack pending bug http://bugzilla.mozilla.org/show_bug.cgi?id=9640
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//#if 0
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nscoord fmAscent, xHeight;
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fm->GetMaxAscent(fmAscent);
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fm->GetXHeight(xHeight);
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subscriptOffset = PR_MAX(subscriptOffset,fmAscent-(xHeight*4)/5);
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//#endif
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//for (int i=0; i<100; i++) {
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//printf("Ascent:%d xHeight:%d subscriptOffset:%d leading: %d ",
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//fmAscent, xHeight, subscriptOffset, leading);
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//}
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subscriptOffset += leading;
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// logic derived after examining the boxes on three cases: h0==h1, h0>h1, h0<h1
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aDesiredSize.height = rect[0].height + rect[1].height - subscriptOffset;
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aDesiredSize.width = rect[0].width + rect[1].width;
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rect[0].x = 0;
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rect[0].y = 0;
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rect[1].x = rect[0].width;
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rect[1].y = aDesiredSize.height - rect[1].height;
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aDesiredSize.descent = aDesiredSize.height - aDesiredSize.ascent;
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if (aPlaceOrigin) {
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// child[0]->SetRect(aPresContext, rect[0]);
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// child[1]->SetRect(aPresContext, rect[1]);
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nsHTMLReflowMetrics childSize(nsnull);
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for (PRInt32 i=0; i<count; i++) {
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childSize.width = rect[i].width;
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childSize.height = rect[i].height;
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FinishReflowChild(child[i], aPresContext, childSize, rect[i].x, rect[i].y, 0);
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}
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}
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return NS_OK;
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}
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