151 lines
4.4 KiB
C++
151 lines
4.4 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 "nsMathMLmsupFrame.h"
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//
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// <msup> -- attach a superscript to a base - implementation
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//
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nsresult
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NS_NewMathMLmsupFrame(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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nsMathMLmsupFrame* it = new nsMathMLmsupFrame;
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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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nsMathMLmsupFrame::nsMathMLmsupFrame()
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{
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}
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nsMathMLmsupFrame::~nsMathMLmsupFrame()
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{
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}
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NS_IMETHODIMP
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nsMathMLmsupFrame::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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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 (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(aPresContext, childFrame);
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}
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else if (2 > 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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child[count] = childFrame;
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rect[count].width = childDesiredSize.width;
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rect[count].height = childDesiredSize.height;
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if (0 == count) {
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aDesiredSize.descent = childDesiredSize.descent;
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}
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count++;
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}
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// else { invalid markup... }
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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 superscript offset
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nscoord 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->GetSuperscriptOffset(superscriptOffset);
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fm->GetLeading(leading);
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superscriptOffset += leading;
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aDesiredSize.height = rect[0].height + rect[1].height - superscriptOffset;
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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[1].x = rect[0].width;
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rect[1].y = 0;
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rect[0].y = aDesiredSize.height - rect[0].height;
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aDesiredSize.ascent = aDesiredSize.height - aDesiredSize.descent;
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child[0]->SetRect(aPresContext, rect[0]);
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child[1]->SetRect(aPresContext, rect[1]);
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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 NS_OK;
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}
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