426 lines
14 KiB
C++
426 lines
14 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 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 "nsFrame.h"
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#include "nsIPresContext.h"
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#include "nsUnitConversion.h"
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#include "nsStyleContext.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 "nsIDOMText.h"
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#include "nsITextContent.h"
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#include "nsIFrameManager.h"
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#include "nsLayoutAtoms.h"
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#include "nsStyleChangeList.h"
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#include "nsINameSpaceManager.h"
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#include "nsMathMLTokenFrame.h"
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nsresult
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NS_NewMathMLTokenFrame(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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nsMathMLTokenFrame* it = new (aPresShell) nsMathMLTokenFrame;
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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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nsMathMLTokenFrame::nsMathMLTokenFrame()
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{
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}
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nsMathMLTokenFrame::~nsMathMLTokenFrame()
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{
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::GetFrameType(nsIAtom** aType) const
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{
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*aType = nsMathMLAtoms::ordinaryMathMLFrame;
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NS_ADDREF(*aType);
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return NS_OK;
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}
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static void
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CompressWhitespace(nsIContent* aContent)
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{
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PRUint32 numKids = aContent->GetChildCount();
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for (PRUint32 kid = 0; kid < numKids; kid++) {
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nsCOMPtr<nsITextContent> tc(do_QueryInterface(aContent->GetChildAt(kid)));
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if (tc && tc->IsContentOfType(nsIContent::eTEXT)) {
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nsAutoString text;
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tc->CopyText(text);
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text.CompressWhitespace();
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tc->SetText(text, PR_FALSE); // not meant to be used if notify is needed
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}
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}
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::Init(nsIPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aParent,
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nsStyleContext* aContext,
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nsIFrame* aPrevInFlow)
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{
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// leading and trailing whitespace doesn't count -- bug 15402
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// brute force removal for people who do <mi> a </mi> instead of <mi>a</mi>
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// XXX the best fix is to skip these in nsTextFrame
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CompressWhitespace(aContent);
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// let the base class do its Init()
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return nsMathMLContainerFrame::Init(aPresContext, aContent, aParent, aContext, aPrevInFlow);
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::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))
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return rv;
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// Safety measure to cater for math fonts with metrics that sometimes
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// cause glyphs in the text frames to protrude outside. Without this,
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// such glyphs may be clipped at the painting stage
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mState |= NS_FRAME_OUTSIDE_CHILDREN;
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nsIFrame* childFrame = mFrames.FirstChild();
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while (childFrame) {
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childFrame->AddStateBits(NS_FRAME_OUTSIDE_CHILDREN);
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childFrame = childFrame->GetNextSibling();
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}
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SetQuotes(aPresContext);
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ProcessTextData(aPresContext);
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return rv;
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}
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nsresult
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nsMathMLTokenFrame::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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// See if this is an incremental reflow
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if (aReflowState.reason == eReflowReason_Incremental) {
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#ifdef MATHML_NOISY_INCREMENTAL_REFLOW
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printf("nsMathMLContainerFrame::ReflowTokenFor:IncrementalReflow received by: ");
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nsFrame::ListTag(stdout, aFrame);
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printf("\n");
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#endif
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}
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// initializations needed for empty markup like <mtag></mtag>
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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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// ask our children to compute their bounding metrics
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nsHTMLReflowMetrics childDesiredSize(aDesiredSize.mComputeMEW,
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aDesiredSize.mFlags | NS_REFLOW_CALC_BOUNDING_METRICS);
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nsSize availSize(aReflowState.mComputedWidth, aReflowState.mComputedHeight);
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PRInt32 count = 0;
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nsIFrame* childFrame;
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FirstChild(aPresContext, nsnull, &childFrame);
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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 = ReflowChild(childFrame, aPresContext, childDesiredSize,
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childReflowState, aStatus);
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//NS_ASSERTION(NS_FRAME_IS_COMPLETE(aStatus), "bad status");
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if (NS_FAILED(rv)) return rv;
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// origins are used as placeholders to store the child's ascent and descent.
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childFrame->SetRect(nsRect(childDesiredSize.descent, childDesiredSize.ascent,
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childDesiredSize.width, childDesiredSize.height));
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// compute and cache the bounding metrics
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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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count++;
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childFrame = childFrame->GetNextSibling();
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}
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if (aDesiredSize.mComputeMEW) {
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aDesiredSize.mMaxElementWidth = childDesiredSize.mMaxElementWidth;
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}
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// cache the frame's mBoundingMetrics
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mBoundingMetrics = aDesiredSize.mBoundingMetrics;
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// place and size children
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FinalizeReflow(aPresContext, *aReflowState.rendContext, aDesiredSize);
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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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// For token elements, mBoundingMetrics is computed at the ReflowToken
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// pass, it is not computed here because our children may be text frames
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// that do not implement the GetBoundingMetrics() interface.
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nsresult
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nsMathMLTokenFrame::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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nsCOMPtr<nsIFontMetrics> fm;
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aPresContext->GetMetricsFor(GetStyleFont()->mFont, getter_AddRefs(fm));
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nscoord ascent, descent;
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fm->GetMaxAscent(ascent);
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fm->GetMaxDescent(descent);
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
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aDesiredSize.width = mBoundingMetrics.width;
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aDesiredSize.ascent = PR_MAX(mBoundingMetrics.ascent, ascent);
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aDesiredSize.descent = PR_MAX(mBoundingMetrics.descent, descent);
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aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
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if (aPlaceOrigin) {
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nscoord dy, dx = 0;
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nsIFrame* childFrame;
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FirstChild(aPresContext, nsnull, &childFrame);
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while (childFrame) {
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nsRect rect = childFrame->GetRect();
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nsHTMLReflowMetrics childSize(nsnull);
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childSize.width = rect.width;
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childSize.height = aDesiredSize.height; //rect.height;
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// place and size the child; (dx,0) makes the caret happy - bug 188146
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dy = rect.IsEmpty() ? 0 : aDesiredSize.ascent - rect.y;
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FinishReflowChild(childFrame, aPresContext, nsnull, childSize, dx, dy, 0);
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dx += rect.width;
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childFrame = childFrame->GetNextSibling();
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}
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}
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SetReference(nsPoint(0, aDesiredSize.ascent));
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::ReflowDirtyChild(nsIPresShell* aPresShell,
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nsIFrame* aChild)
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{
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// if we get this, it means it was called by the nsTextFrame beneath us, and
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// this means something changed in the text content. So re-process our text
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nsCOMPtr<nsIPresContext> presContext;
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aPresShell->GetPresContext(getter_AddRefs(presContext));
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ProcessTextData(presContext);
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mState |= NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN;
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return mParent->ReflowDirtyChild(aPresShell, this);
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::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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{
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if (nsMathMLAtoms::lquote_ == aAttribute ||
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nsMathMLAtoms::rquote_ == aAttribute) {
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SetQuotes(aPresContext);
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}
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return nsMathMLContainerFrame::
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AttributeChanged(aPresContext, aContent, aNameSpaceID,
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aAttribute, aModType);
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}
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void
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nsMathMLTokenFrame::ProcessTextData(nsIPresContext* aPresContext)
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{
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SetTextStyle(aPresContext);
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}
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///////////////////////////////////////////////////////////////////////////
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// For <mi>, if the content is not a single character, turn the font to
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// normal (this function will also query attributes from the mstyle hierarchy)
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void
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nsMathMLTokenFrame::SetTextStyle(nsIPresContext* aPresContext)
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{
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nsCOMPtr<nsIAtom> tag;
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mContent->GetTag(getter_AddRefs(tag));
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if (tag != nsMathMLAtoms::mi_)
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return;
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if (!mFrames.FirstChild())
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return;
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// Get the text content that we enclose and its length
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// our content can include comment-nodes, attribute-nodes, text-nodes...
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// we use the DOM to make sure that we are only looking at text-nodes...
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nsAutoString data;
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PRUint32 numKids = mContent->GetChildCount();
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for (PRUint32 kid = 0; kid < numKids; kid++) {
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nsCOMPtr<nsIDOMText> kidText(do_QueryInterface(mContent->GetChildAt(kid)));
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if (kidText) {
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nsAutoString kidData;
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kidText->GetData(kidData);
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data += kidData;
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}
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}
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// attributes may override the default behavior
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PRInt32 length = data.Length();
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nsAutoString fontstyle;
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PRBool restyle = PR_TRUE;
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if (NS_CONTENT_ATTR_HAS_VALUE == GetAttribute(mContent, mPresentationData.mstyle,
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nsMathMLAtoms::fontstyle_, fontstyle))
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restyle = PR_FALSE;
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if (1 == length) {
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// our textual content consists of a single character
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PRBool isStyleInvariant = nsMathMLOperators::LookupInvariantChar(data[0]);
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if (isStyleInvariant) {
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// bug 65951 - we always enforce the style to normal for a non-stylable char
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// XXX also disable bold type? (makes sense to let the set IR be bold, no?)
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fontstyle.Assign(NS_LITERAL_STRING("normal"));
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restyle = PR_TRUE;
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}
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else {
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fontstyle.Assign(NS_LITERAL_STRING("italic"));
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}
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}
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else {
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// our textual content consists of multiple characters
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fontstyle.Assign(NS_LITERAL_STRING("normal"));
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}
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// set the -moz-math-font-style attribute without notifying that we want a reflow
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if (restyle)
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mContent->SetAttr(kNameSpaceID_None, nsMathMLAtoms::fontstyle, fontstyle, PR_FALSE);
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// then, re-resolve the style contexts in our subtree
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nsCOMPtr<nsIPresShell> presShell;
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aPresContext->GetShell(getter_AddRefs(presShell));
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if (presShell) {
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nsCOMPtr<nsIFrameManager> fm;
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presShell->GetFrameManager(getter_AddRefs(fm));
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if (fm) {
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nsChangeHint maxChange, minChange = NS_STYLE_HINT_NONE;
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nsStyleChangeList changeList;
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fm->ComputeStyleChangeFor(this,
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kNameSpaceID_None, nsMathMLAtoms::fontstyle,
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changeList, minChange, maxChange);
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#ifdef DEBUG
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// Use the parent frame to make sure we catch in-flows and such
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nsIFrame* parentFrame = GetParent();
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fm->DebugVerifyStyleTree(parentFrame ? parentFrame : this);
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#endif
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}
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}
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}
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///////////////////////////////////////////////////////////////////////////
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// For <ms>, 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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//
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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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static void
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SetQuote(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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nsString& aValue)
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{
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nsIFrame* textFrame;
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do {
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// walk down the hierarchy of first children because they could be wrapped
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aFrame->FirstChild(aPresContext, nsnull, &textFrame);
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if (textFrame) {
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nsCOMPtr<nsIAtom> frameType;
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textFrame->GetFrameType(getter_AddRefs(frameType));
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if (frameType == nsLayoutAtoms::textFrame)
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break;
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}
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aFrame = textFrame;
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} while (textFrame);
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if (textFrame) {
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nsIContent* quoteContent = textFrame->GetContent();
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if (quoteContent) {
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nsCOMPtr<nsIDOMText> domText(do_QueryInterface(quoteContent));
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if (domText) {
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nsCOMPtr<nsITextContent> tc(do_QueryInterface(quoteContent));
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if (tc) {
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tc->SetText(aValue, PR_FALSE); // no notify since we don't want a reflow yet
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}
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}
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}
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}
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}
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void
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nsMathMLTokenFrame::SetQuotes(nsIPresContext* aPresContext)
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{
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nsCOMPtr<nsIAtom> tag;
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mContent->GetTag(getter_AddRefs(tag));
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if (tag != nsMathMLAtoms::ms_)
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return;
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nsIFrame* rightFrame = nsnull;
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nsIFrame* baseFrame = nsnull;
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nsIFrame* leftFrame = mFrames.FirstChild();
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if (leftFrame)
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baseFrame = leftFrame->GetNextSibling();
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if (baseFrame)
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rightFrame = baseFrame->GetNextSibling();
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if (!leftFrame || !baseFrame || !rightFrame)
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return;
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nsAutoString value;
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// lquote
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if (NS_CONTENT_ATTR_NOT_THERE != GetAttribute(mContent, mPresentationData.mstyle,
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nsMathMLAtoms::lquote_, value)) {
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SetQuote(aPresContext, leftFrame, value);
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}
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// rquote
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if (NS_CONTENT_ATTR_NOT_THERE != GetAttribute(mContent, mPresentationData.mstyle,
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nsMathMLAtoms::rquote_, value)) {
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SetQuote(aPresContext, rightFrame, value);
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}
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}
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