134 lines
4.1 KiB
C++
134 lines
4.1 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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*/
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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 "nsIDOMText.h"
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#include "nsMathMLmsFrame.h"
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//
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// <ms> -- string literal - implementation
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//
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nsresult
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NS_NewMathMLmsFrame(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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nsMathMLmsFrame* it = new (aPresShell) nsMathMLmsFrame;
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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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nsMathMLmsFrame::nsMathMLmsFrame()
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{
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}
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nsMathMLmsFrame::~nsMathMLmsFrame()
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{
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}
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NS_IMETHODIMP
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nsMathMLmsFrame::SetInitialChildList(nsIPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList)
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{
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// 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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// 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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PRInt32 count = 0;
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nsIFrame* rightFrame = nsnull;
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nsIFrame* leftFrame = nsnull;
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nsIFrame* childFrame = aChildList;
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while (childFrame) {
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if (0 == count) leftFrame = childFrame;
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// 1 == count is the the frame for the actual content of <ms>
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else if (2 == count) rightFrame = childFrame;
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count++;
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childFrame->GetNextSibling(&childFrame);
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}
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if (3 == count && leftFrame && rightFrame) {
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nsAutoString value;
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nsIFrame* textFrame;
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nsCOMPtr<nsIContent> quoteContent;
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// lquote
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if (NS_CONTENT_ATTR_HAS_VALUE == GetAttribute(mContent, mPresentationData.mstyle,
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nsMathMLAtoms::lquote_, value)) {
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leftFrame->FirstChild(aPresContext, nsnull, &textFrame);
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if (textFrame) {
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textFrame->GetContent(getter_AddRefs(quoteContent));
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if (quoteContent.get()) {
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nsCOMPtr<nsIDOMText> domText(do_QueryInterface(quoteContent));
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if (domText.get()) domText->SetData(value);
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}
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}
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}
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// rquote
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if (NS_CONTENT_ATTR_HAS_VALUE == GetAttribute(mContent, mPresentationData.mstyle,
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nsMathMLAtoms::rquote_, value)) {
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rightFrame->FirstChild(aPresContext, nsnull, &textFrame);
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if (textFrame) {
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textFrame->GetContent(getter_AddRefs(quoteContent));
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if (quoteContent.get()) {
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nsCOMPtr<nsIDOMText> domText(do_QueryInterface(quoteContent));
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if (domText.get()) domText->SetData(value);
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}
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}
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}
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}
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// let the base class take care of the rest
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return nsMathMLContainerFrame::SetInitialChildList(aPresContext, aListName, aChildList);
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}
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