650 lines
23 KiB
C++
650 lines
23 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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* Pierre Phaneuf <pp@ludusdesign.com>
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*/
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#include "nsCOMPtr.h"
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#include "nsFrame.h"
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#include "nsIPresContext.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 "nsIRenderingContext.h"
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#include "nsIFontMetrics.h"
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#include "nsMathMLmfencedFrame.h"
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//
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// <mfenced> -- surround content with a pair of fences
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//
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nsresult
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NS_NewMathMLmfencedFrame(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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nsMathMLmfencedFrame* it = new (aPresShell) nsMathMLmfencedFrame;
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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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nsMathMLmfencedFrame::nsMathMLmfencedFrame()
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{
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}
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nsMathMLmfencedFrame::~nsMathMLmfencedFrame()
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{
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RemoveFencesAndSeparators();
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}
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NS_IMETHODIMP
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nsMathMLmfencedFrame::InheritAutomaticData(nsIPresContext* aPresContext,
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nsIFrame* aParent)
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{
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// let the base class get the default from our parent
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nsMathMLContainerFrame::InheritAutomaticData(aPresContext, aParent);
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mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmfencedFrame::SetInitialChildList(nsIPresContext* 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)) return rv;
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// No need to tract the style contexts given to our MathML chars.
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// The Style System will use Get/SetAdditionalStyleContext() to keep them
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// up-to-date if dynamic changes arise.
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return CreateFencesAndSeparators(aPresContext);
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}
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NS_IMETHODIMP
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nsMathMLmfencedFrame::AttributeChanged(nsIPresContext* aPresContext,
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nsIContent* aContent,
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PRInt32 aNameSpaceID,
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nsIAtom* aAttribute,
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PRInt32 aModType,
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PRInt32 aHint)
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{
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RemoveFencesAndSeparators();
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CreateFencesAndSeparators(aPresContext);
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return nsMathMLContainerFrame::
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AttributeChanged(aPresContext, aContent, aNameSpaceID,
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aAttribute, aModType, aHint);
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}
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nsresult
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nsMathMLmfencedFrame::ChildListChanged(nsIPresContext* aPresContext,
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PRInt32 aModType)
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{
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RemoveFencesAndSeparators();
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CreateFencesAndSeparators(aPresContext);
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return nsMathMLContainerFrame::ChildListChanged(aPresContext, aModType);
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}
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void
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nsMathMLmfencedFrame::RemoveFencesAndSeparators()
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{
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if (mOpenChar) delete mOpenChar;
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if (mCloseChar) delete mCloseChar;
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if (mSeparatorsChar) delete[] mSeparatorsChar;
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mOpenChar = nsnull;
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mCloseChar = nsnull;
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mSeparatorsChar = nsnull;
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mSeparatorsCount = 0;
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}
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nsresult
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nsMathMLmfencedFrame::CreateFencesAndSeparators(nsIPresContext* aPresContext)
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{
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nsresult rv;
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nsAutoString value, data;
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PRBool isMutable = PR_FALSE;
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//////////////
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// see if the opening fence is there ...
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rv = GetAttribute(mContent, mPresentationData.mstyle,
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nsMathMLAtoms::open_, value);
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if (NS_CONTENT_ATTR_HAS_VALUE == rv) {
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value.Trim(" ");
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data = value;
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}
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else if (NS_CONTENT_ATTR_NOT_THERE == rv)
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data = PRUnichar('('); // default as per the MathML REC
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else
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data.Truncate();
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if (0 < data.Length()) {
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mOpenChar = new nsMathMLChar;
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if (!mOpenChar) return NS_ERROR_OUT_OF_MEMORY;
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mOpenChar->SetData(aPresContext, data);
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isMutable = nsMathMLOperators::IsMutableOperator(data);
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ResolveMathMLCharStyle(aPresContext, mContent, mStyleContext, mOpenChar, isMutable);
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}
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//////////////
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// see if the closing fence is there ...
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rv = GetAttribute(mContent, mPresentationData.mstyle,
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nsMathMLAtoms::close_, value);
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if (NS_CONTENT_ATTR_HAS_VALUE == rv) {
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value.Trim(" ");
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data = value;
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}
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else if (NS_CONTENT_ATTR_NOT_THERE == rv)
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data = PRUnichar(')'); // default as per the MathML REC
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else
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data.Truncate();
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if (0 < data.Length()) {
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mCloseChar = new nsMathMLChar;
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if (!mCloseChar) return NS_ERROR_OUT_OF_MEMORY;
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mCloseChar->SetData(aPresContext, data);
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isMutable = nsMathMLOperators::IsMutableOperator(data);
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ResolveMathMLCharStyle(aPresContext, mContent, mStyleContext, mCloseChar, isMutable);
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}
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//////////////
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// see if separators are there ...
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rv = GetAttribute(mContent, mPresentationData.mstyle,
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nsMathMLAtoms::separators_, value);
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if (NS_CONTENT_ATTR_HAS_VALUE == rv) {
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value.Trim(" ");
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data = value;
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}
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else if (NS_CONTENT_ATTR_NOT_THERE == rv)
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data = PRUnichar(','); // default as per the MathML REC
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else
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data.Truncate();
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mSeparatorsCount = data.Length();
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if (0 < mSeparatorsCount) {
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PRInt32 sepCount = mFrames.GetLength() - 1;
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if (0 < sepCount) {
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mSeparatorsChar = new nsMathMLChar[sepCount];
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if (!mSeparatorsChar) return NS_ERROR_OUT_OF_MEMORY;
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nsAutoString sepChar;
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for (PRInt32 i = 0; i < sepCount; i++) {
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if (i < mSeparatorsCount) {
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sepChar = data[i];
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isMutable = nsMathMLOperators::IsMutableOperator(sepChar);
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}
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else {
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sepChar = data[mSeparatorsCount-1];
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// keep the value of isMutable that was set earlier
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}
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mSeparatorsChar[i].SetData(aPresContext, sepChar);
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ResolveMathMLCharStyle(aPresContext, mContent, mStyleContext, &mSeparatorsChar[i], isMutable);
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}
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}
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mSeparatorsCount = sepCount;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmfencedFrame::Paint(nsIPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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nsFramePaintLayer aWhichLayer,
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PRUint32 aFlags)
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{
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/////////////
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// paint the content
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nsresult rv = nsMathMLContainerFrame::Paint(aPresContext, aRenderingContext,
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aDirtyRect, aWhichLayer);
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////////////
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// paint fences and separators
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if (NS_SUCCEEDED(rv)) {
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if (mOpenChar) mOpenChar->Paint(aPresContext, aRenderingContext,
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aDirtyRect, aWhichLayer, this);
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if (mCloseChar) mCloseChar->Paint(aPresContext, aRenderingContext,
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aDirtyRect, aWhichLayer, this);
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for (PRInt32 i = 0; i < mSeparatorsCount; i++) {
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mSeparatorsChar[i].Paint(aPresContext, aRenderingContext,
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aDirtyRect, aWhichLayer, this);
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}
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}
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return rv;
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}
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NS_IMETHODIMP
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nsMathMLmfencedFrame::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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return doReflow(aPresContext, aReflowState, aDesiredSize, aStatus, this,
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mOpenChar, mCloseChar, mSeparatorsChar, mSeparatorsCount);
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}
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// exported routine that both mfenced and mfrac share.
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// mfrac uses this when its bevelled attribute is set.
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/*static*/ nsresult
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nsMathMLmfencedFrame::doReflow(nsIPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nsHTMLReflowMetrics& aDesiredSize,
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nsReflowStatus& aStatus,
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nsIFrame* aForFrame,
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nsMathMLChar* aOpenChar,
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nsMathMLChar* aCloseChar,
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nsMathMLChar* aSeparatorsChar,
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PRInt32 aSeparatorsCount)
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{
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nsresult rv;
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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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nsMathMLContainerFrame* mathMLFrame =
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NS_STATIC_CAST(nsMathMLContainerFrame*, aForFrame);
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PRInt32 i;
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const nsStyleFont* font;
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aForFrame->GetStyleData(eStyleStruct_Font, (const nsStyleStruct *&)font);
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nsCOMPtr<nsIFontMetrics> fm;
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aReflowState.rendContext->SetFont(font->mFont, nsnull);
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aReflowState.rendContext->GetFontMetrics(*getter_AddRefs(fm));
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nscoord axisHeight, em;
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GetAxisHeight(*aReflowState.rendContext, fm, axisHeight);
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GetEmHeight(fm, em);
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// leading to be left at the top and the bottom of stretched chars
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nscoord leading = NSToCoordRound(0.2f * em);
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/////////////
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// Reflow children
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// Asking each child to cache its bounding metrics
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// Note that we don't use the base method nsMathMLContainerFrame::Reflow()
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// because we want to stretch our fences, separators and stretchy frames using
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// the *same* initial aDesiredSize.mBoundingMetrics. If we were to use the base
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// method here, our stretchy frames will be stretched and placed, and we may
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// end up stretching our fences/separators with a different aDesiredSize.
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// XXX The above decision was revisited in bug 121748 and this code can be
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// refactored to use nsMathMLContainerFrame::Reflow() at some stage.
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PRInt32 count = 0;
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nsReflowStatus childStatus;
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nsSize availSize(aReflowState.mComputedWidth, aReflowState.mComputedHeight);
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nsHTMLReflowMetrics childDesiredSize(aDesiredSize.maxElementSize,
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aDesiredSize.mFlags | NS_REFLOW_CALC_BOUNDING_METRICS);
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nsIFrame* firstChild;
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aForFrame->FirstChild(aPresContext, nsnull, &firstChild);
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nsIFrame* childFrame = firstChild;
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if (firstChild || aOpenChar || aCloseChar || aSeparatorsCount > 0) {
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// We use the ASCII metrics to get our minimum height. This way, if we have
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// borders or a background, they will fit better with other elements on the line
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fm->GetMaxAscent(aDesiredSize.ascent);
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fm->GetMaxDescent(aDesiredSize.descent);
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}
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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 = mathMLFrame->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)) return rv;
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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 as placeholders to store the child's ascent and descent. Later on,
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// we should set the origins so as to overwrite what we are storing there now.
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childFrame->SetRect(aPresContext,
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nsRect(childDesiredSize.descent, childDesiredSize.ascent,
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childDesiredSize.width, childDesiredSize.height));
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// compute the bounding metrics right now for mfrac
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if (aDesiredSize.descent < childDesiredSize.descent)
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aDesiredSize.descent = childDesiredSize.descent;
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if (aDesiredSize.ascent < childDesiredSize.ascent)
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aDesiredSize.ascent = childDesiredSize.ascent;
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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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childFrame->GetNextSibling(&childFrame);
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}
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/////////////
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// Ask stretchy children to stretch themselves
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nsBoundingMetrics containerSize;
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nsStretchDirection stretchDir = NS_STRETCH_DIRECTION_VERTICAL;
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nsPresentationData presentationData;
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mathMLFrame->GetPresentationData(presentationData);
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if (!NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(presentationData.flags)) {
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// case when the call is made for mfrac, we only need to stretch the '/' separator
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containerSize = aDesiredSize.mBoundingMetrics; // computed earlier
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}
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else {
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// case when the call is made for mfenced
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mathMLFrame->GetPreferredStretchSize(aPresContext, *aReflowState.rendContext,
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0, /* i.e., without embellishments */
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stretchDir, containerSize);
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childFrame = firstChild;
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while (childFrame) {
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nsIMathMLFrame* mathmlChild;
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childFrame->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&mathmlChild);
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if (mathmlChild) {
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// retrieve the metrics that was stored at the previous pass
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GetReflowAndBoundingMetricsFor(childFrame, childDesiredSize, childDesiredSize.mBoundingMetrics);
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mathmlChild->Stretch(aPresContext, *aReflowState.rendContext,
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stretchDir, containerSize, childDesiredSize);
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// store the updated metrics
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childFrame->SetRect(aPresContext,
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nsRect(childDesiredSize.descent, childDesiredSize.ascent,
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childDesiredSize.width, childDesiredSize.height));
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if (aDesiredSize.descent < childDesiredSize.descent)
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aDesiredSize.descent = childDesiredSize.descent;
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if (aDesiredSize.ascent < childDesiredSize.ascent)
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aDesiredSize.ascent = childDesiredSize.ascent;
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}
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childFrame->GetNextSibling(&childFrame);
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}
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// bug 121748: for surrounding fences & separators, use a size that covers everything
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mathMLFrame->GetPreferredStretchSize(aPresContext, *aReflowState.rendContext,
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STRETCH_CONSIDER_EMBELLISHMENTS,
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stretchDir, containerSize);
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}
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//////////////////////////////////////////
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// Prepare the opening fence, separators, and closing fence, and
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// adjust the origin of children.
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// we need to center around the axis
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if (firstChild) { // do nothing for an empty <mfenced></mfenced>
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nscoord delta = PR_MAX(containerSize.ascent - axisHeight,
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containerSize.descent + axisHeight);
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containerSize.ascent = delta + axisHeight;
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containerSize.descent = delta - axisHeight;
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}
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/////////////////
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// opening fence ...
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ReflowChar(aPresContext, *aReflowState.rendContext, aOpenChar,
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NS_MATHML_OPERATOR_FORM_PREFIX, presentationData.scriptLevel,
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axisHeight, leading, em, containerSize, aDesiredSize);
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/////////////////
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// separators ...
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for (i = 0; i < aSeparatorsCount; i++) {
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ReflowChar(aPresContext, *aReflowState.rendContext, &aSeparatorsChar[i],
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NS_MATHML_OPERATOR_FORM_INFIX, presentationData.scriptLevel,
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axisHeight, leading, em, containerSize, aDesiredSize);
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}
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/////////////////
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// closing fence ...
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ReflowChar(aPresContext, *aReflowState.rendContext, aCloseChar,
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NS_MATHML_OPERATOR_FORM_POSTFIX, presentationData.scriptLevel,
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axisHeight, leading, em, containerSize, aDesiredSize);
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//////////////////
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// Adjust the origins of each child.
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// and update our bounding metrics
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i = 0;
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nscoord dx = 0;
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nsBoundingMetrics bm;
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PRBool firstTime = PR_TRUE;
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if (aOpenChar) {
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PlaceChar(aOpenChar, aDesiredSize.ascent, bm, dx);
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aDesiredSize.mBoundingMetrics = bm;
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firstTime = PR_FALSE;
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}
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childFrame = firstChild;
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while (childFrame) {
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nsHTMLReflowMetrics childSize(nsnull);
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GetReflowAndBoundingMetricsFor(childFrame, childSize, bm);
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if (firstTime) {
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firstTime = PR_FALSE;
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aDesiredSize.mBoundingMetrics = bm;
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}
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else
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aDesiredSize.mBoundingMetrics += bm;
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mathMLFrame->FinishReflowChild(childFrame, aPresContext, nsnull, childSize,
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dx, aDesiredSize.ascent - childSize.ascent, 0);
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dx += childSize.width;
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if (i < aSeparatorsCount) {
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PlaceChar(&aSeparatorsChar[i], aDesiredSize.ascent, bm, dx);
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aDesiredSize.mBoundingMetrics += bm;
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}
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i++;
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childFrame->GetNextSibling(&childFrame);
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}
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if (aCloseChar) {
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PlaceChar(aCloseChar, aDesiredSize.ascent, bm, dx);
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if (firstTime)
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aDesiredSize.mBoundingMetrics = bm;
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else
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aDesiredSize.mBoundingMetrics += bm;
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}
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aDesiredSize.width = aDesiredSize.mBoundingMetrics.width;
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aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
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if (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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mathMLFrame->SetBoundingMetrics(aDesiredSize.mBoundingMetrics);
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mathMLFrame->SetReference(nsPoint(0, aDesiredSize.ascent));
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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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// helper functions to perform the common task of formatting our chars
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/*static*/ nsresult
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nsMathMLmfencedFrame::ReflowChar(nsIPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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nsMathMLChar* aMathMLChar,
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nsOperatorFlags aForm,
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PRInt32 aScriptLevel,
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nscoord axisHeight,
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nscoord leading,
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nscoord em,
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nsBoundingMetrics& aContainerSize,
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nsHTMLReflowMetrics& aDesiredSize)
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{
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if (aMathMLChar && 0 < aMathMLChar->Length()) {
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nsOperatorFlags flags = 0;
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float leftSpace = 0.0f;
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float rightSpace = 0.0f;
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nsAutoString data;
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aMathMLChar->GetData(data);
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PRBool found = nsMathMLOperators::LookupOperator(data, aForm,
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&flags, &leftSpace, &rightSpace);
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// If we don't want extra space when we are a script
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if (found && aScriptLevel > 0) {
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leftSpace /= 2.0f;
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rightSpace /= 2.0f;
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}
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// stretch the char to the appropriate height if it is not big enough.
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nsBoundingMetrics charSize;
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nsresult res = aMathMLChar->Stretch(aPresContext, aRenderingContext,
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NS_STRETCH_DIRECTION_VERTICAL,
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aContainerSize, charSize);
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if (NS_STRETCH_DIRECTION_UNSUPPORTED != aMathMLChar->GetStretchDirection()) {
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// has changed... so center the char around the axis
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nscoord height = charSize.ascent + charSize.descent;
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charSize.ascent = height/2 + axisHeight;
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charSize.descent = height - charSize.ascent;
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}
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else {
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// either it hasn't changed or stretching the char failed (i.e.,
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// GetBoundingMetrics failed)
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leading = 0;
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if (NS_FAILED(res)) {
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nsTextDimensions dimensions;
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aRenderingContext.GetTextDimensions(data.get(), data.Length(), dimensions);
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charSize.ascent = dimensions.ascent;
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charSize.descent = dimensions.descent;
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charSize.width = dimensions.width;
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// Set this as the bounding metrics of the MathMLChar to leave
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// the necessary room to paint the char.
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aMathMLChar->SetBoundingMetrics(charSize);
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}
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}
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if (aDesiredSize.ascent < charSize.ascent + leading)
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aDesiredSize.ascent = charSize.ascent + leading;
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if (aDesiredSize.descent < charSize.descent + leading)
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aDesiredSize.descent = charSize.descent + leading;
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// account the spacing
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charSize.width += NSToCoordRound((leftSpace + rightSpace) * em);
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// x-origin is used to store lspace ...
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// y-origin is used to stored the ascent ...
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aMathMLChar->SetRect(nsRect(NSToCoordRound(leftSpace * em),
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charSize.ascent, charSize.width,
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charSize.ascent + charSize.descent));
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}
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return NS_OK;
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}
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/*static*/ void
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nsMathMLmfencedFrame::PlaceChar(nsMathMLChar* aMathMLChar,
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nscoord aDesiredAscent,
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nsBoundingMetrics& bm,
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nscoord& dx)
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{
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aMathMLChar->GetBoundingMetrics(bm);
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// the char's x-origin was used to store lspace ...
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// the char's y-origin was used to store the ascent ...
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nsRect rect;
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aMathMLChar->GetRect(rect);
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nscoord dy = aDesiredAscent - rect.y;
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if (aMathMLChar->GetStretchDirection() != NS_STRETCH_DIRECTION_UNSUPPORTED) {
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// the stretchy char will be centered around the axis
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// so we adjust the returned bounding metrics accordingly
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bm.descent = (bm.ascent + bm.descent) - rect.y;
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bm.ascent = rect.y;
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}
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aMathMLChar->SetRect(nsRect(dx + rect.x, dy, bm.width, rect.height));
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bm.leftBearing += rect.x;
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bm.rightBearing += rect.x;
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// return rect.width since it includes lspace and rspace
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bm.width = rect.width;
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dx += rect.width;
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}
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// ----------------------
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// the Style System will use these to pass the proper style context to our MathMLChar
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NS_IMETHODIMP
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nsMathMLmfencedFrame::GetAdditionalStyleContext(PRInt32 aIndex,
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nsIStyleContext** aStyleContext) const
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{
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NS_PRECONDITION(aStyleContext, "null OUT ptr");
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PRInt32 openIndex = -1;
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PRInt32 closeIndex = -1;
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PRInt32 lastIndex = mSeparatorsCount-1;
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if (mOpenChar) {
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lastIndex++;
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openIndex = lastIndex;
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}
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if (mCloseChar) {
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lastIndex++;
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closeIndex = lastIndex;
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}
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if (aIndex < 0 || aIndex > lastIndex) {
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return NS_ERROR_INVALID_ARG;
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}
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*aStyleContext = nsnull;
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if (aIndex < mSeparatorsCount) {
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mSeparatorsChar[aIndex].GetStyleContext(aStyleContext);
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}
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else if (aIndex == openIndex) {
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mOpenChar->GetStyleContext(aStyleContext);
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}
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else if (aIndex == closeIndex) {
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mCloseChar->GetStyleContext(aStyleContext);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmfencedFrame::SetAdditionalStyleContext(PRInt32 aIndex,
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nsIStyleContext* aStyleContext)
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{
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PRInt32 openIndex = -1;
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PRInt32 closeIndex = -1;
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PRInt32 lastIndex = mSeparatorsCount-1;
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if (mOpenChar) {
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lastIndex++;
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openIndex = lastIndex;
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}
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if (mCloseChar) {
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lastIndex++;
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closeIndex = lastIndex;
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}
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if (aIndex < 0 || aIndex > lastIndex) {
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return NS_ERROR_INVALID_ARG;
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}
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if (aIndex < mSeparatorsCount) {
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mSeparatorsChar[aIndex].SetStyleContext(aStyleContext);
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}
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else if (aIndex == openIndex) {
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mOpenChar->SetStyleContext(aStyleContext);
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}
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else if (aIndex == closeIndex) {
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mCloseChar->SetStyleContext(aStyleContext);
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}
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return NS_OK;
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}
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