1863 lines
68 KiB
C++
1863 lines
68 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 "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 "nsIPresShell.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 "nsITextContent.h"
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#include "nsMathMLAtoms.h"
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#include "nsMathMLParts.h"
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#include "nsMathMLChar.h"
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#include "nsMathMLContainerFrame.h"
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//
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// nsMathMLContainerFrame implementation
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//
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// TODO: Proper management of ignorable whitespace
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// and handling of non-math related frames.
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// * Should math markups only enclose other math markups?
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// Why bother... we can leave them in, as hinted in the newsgroup.
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//
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// * Space doesn't count. Handling space is more complicated than it seems.
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// We have to clean inside and outside:
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// <mi> a </mi> <mo> + </mo> <mi> b </mi>
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// ^ ^ ^ ^ ^ ^ ^ ^
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// *Outside* currently handled using IsOnlyWhitespace().
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// For whitespace only frames, their rect is set zero.
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//
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// *Inside* not currently handled... so the user must do <mi>a</mi>
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// What to do?!
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// - Add a nsTextFrame::CompressWhitespace() *if* it is MathML content?!
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// - via CSS property? Support for "none/compress"? (white-space: normal | pre | nowrap)
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// nsISupports
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// =============================================================================
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NS_INTERFACE_MAP_BEGIN(nsMathMLContainerFrame)
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NS_INTERFACE_MAP_ENTRY(nsIMathMLFrame)
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#ifdef NS_DEBUG
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NS_INTERFACE_MAP_ENTRY(nsIFrameDebug)
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#endif
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NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIMathMLFrame)
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NS_INTERFACE_MAP_END_INHERITING(nsHTMLContainerFrame)
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NS_IMETHODIMP_(nsrefcnt)
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nsMathMLContainerFrame::AddRef(void)
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{
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return NS_OK;
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}
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NS_IMETHODIMP_(nsrefcnt)
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nsMathMLContainerFrame::Release(void)
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{
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return NS_OK;
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}
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/* ///////////////
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* MathML specific - Whitespace management ...
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* WHITESPACE: don't forget that whitespace doesn't count in MathML!
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* empty frames shouldn't be created in MathML, oh well that's another story.
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* =============================================================================
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*/
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PRBool
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nsMathMLContainerFrame::IsOnlyWhitespace(nsIFrame* aFrame)
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{
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NS_PRECONDITION(aFrame, "null arg");
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// quick return if we have encountered this frame before
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nsFrameState state;
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aFrame->GetFrameState(&state);
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if (NS_FRAME_IS_UNFLOWABLE & state)
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return PR_TRUE;
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// by empty frame we mean a leaf frame whose text content is empty...
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PRBool rv = PR_FALSE;
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nsCOMPtr<nsIContent> aContent;
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aFrame->GetContent(getter_AddRefs(aContent));
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if (!aContent) return PR_TRUE;
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PRInt32 numKids;
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aContent->ChildCount(numKids);
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if (0 == numKids) {
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nsCOMPtr<nsITextContent> tc(do_QueryInterface(aContent));
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if (tc.get()) tc->IsOnlyWhitespace(&rv);
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}
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if (rv) {
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// mark the frame as unflowable
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aFrame->SetFrameState(NS_FRAME_IS_UNFLOWABLE | state);
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}
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return rv;
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}
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// helper to get an attribute from the content or the surrounding <mstyle> hierarchy
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nsresult
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nsMathMLContainerFrame::GetAttribute(nsIContent* aContent,
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nsIFrame* aMathMLmstyleFrame,
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nsIAtom* aAttributeAtom,
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nsString& aValue)
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{
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nsresult rv = NS_CONTENT_ATTR_NOT_THERE;
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// see if we can get the attribute from the content
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if (aContent)
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{
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rv = aContent->GetAttribute(kNameSpaceID_None, aAttributeAtom, aValue);
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}
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if (NS_CONTENT_ATTR_NOT_THERE == rv)
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{
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// see if we can get the attribute from the mstyle frame
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if (aMathMLmstyleFrame)
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{
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nsCOMPtr<nsIContent> mstyleContent;
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aMathMLmstyleFrame->GetContent(getter_AddRefs(mstyleContent));
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nsIFrame* mstyleParent;
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aMathMLmstyleFrame->GetParent(&mstyleParent);
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nsPresentationData mstyleParentData;
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mstyleParentData.mstyle = nsnull;
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if (mstyleParent)
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{
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nsIMathMLFrame* aMathMLFrame = nsnull;
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rv = mstyleParent->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&aMathMLFrame);
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if (NS_SUCCEEDED(rv) && nsnull != aMathMLFrame)
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{
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aMathMLFrame->GetPresentationData(mstyleParentData);
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}
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}
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// recurse all the way up into the <mstyle> hierarchy
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rv = GetAttribute(mstyleContent, mstyleParentData.mstyle, aAttributeAtom, aValue);
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}
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}
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return rv;
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}
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void
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nsMathMLContainerFrame::GetRuleThickness(nsIRenderingContext& aRenderingContext,
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nsIFontMetrics* aFontMetrics,
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nscoord& aRuleThickness)
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{
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// get the bounding metrics of the overbar char, the rendering context
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// is assumed to have been set with the font of the current style context
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nscoord xHeight;
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aFontMetrics->GetXHeight(xHeight);
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PRUnichar overBar = 0x00AF;
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nsBoundingMetrics bm;
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nsresult rv = aRenderingContext.GetBoundingMetrics(&overBar, PRUint32(1), bm);
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if (NS_SUCCEEDED(rv)) {
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aRuleThickness = bm.ascent + bm.descent;
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}
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if (NS_FAILED(rv) || aRuleThickness <= 0 || aRuleThickness >= xHeight) {
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// fall-back to the other version
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GetRuleThickness(aFontMetrics, aRuleThickness);
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}
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#if 0
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nscoord oldRuleThickness;
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GetRuleThickness(aFontMetrics, oldRuleThickness);
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PRUnichar sqrt = 0xE063; // a sqrt glyph from TeX's CMEX font
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rv = aRenderingContext.GetBoundingMetrics(&sqrt, PRUint32(1), bm);
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nscoord sqrtrule = bm.ascent; // according to TeX, the ascent should be the rule
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printf("xheight:%4d rule:%4d oldrule:%4d sqrtrule:%4d\n",
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xHeight, aRuleThickness, oldRuleThickness, sqrtrule);
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#endif
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}
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void
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nsMathMLContainerFrame::GetAxisHeight(nsIRenderingContext& aRenderingContext,
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nsIFontMetrics* aFontMetrics,
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nscoord& aAxisHeight)
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{
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// get the bounding metrics of the minus sign, the rendering context
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// is assumed to have been set with the font of the current style context
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nscoord xHeight;
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aFontMetrics->GetXHeight(xHeight);
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PRUnichar minus = '-';
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nsBoundingMetrics bm;
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nsresult rv = aRenderingContext.GetBoundingMetrics(&minus, PRUint32(1), bm);
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if (NS_SUCCEEDED(rv)) {
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aAxisHeight = bm.ascent - (bm.ascent + bm.descent)/2;
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}
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if (NS_FAILED(rv) || aAxisHeight <= 0 || aAxisHeight >= xHeight) {
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// fall-back to the other version
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GetAxisHeight(aFontMetrics, aAxisHeight);
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}
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#if 0
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nscoord oldAxis;
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GetAxisHeight(aFontMetrics, oldAxis);
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PRUnichar plus = '+';
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rv = aRenderingContext.GetBoundingMetrics(&plus, PRUint32(1), bm);
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nscoord plusAxis = bm.ascent - (bm.ascent + bm.descent)/2;;
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printf("xheight:%4d Axis:%4d oldAxis:%4d plusAxis:%4d\n",
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xHeight, aAxisHeight, oldAxis, plusAxis);
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#endif
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}
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// ================
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// Utilities for parsing and retrieving numeric values
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// All returned values are in twips.
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/*
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The REC says:
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An explicit plus sign ('+') is not allowed as part of a numeric value
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except when it is specifically listed in the syntax (as a quoted '+' or "+"),
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Units allowed
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ID Description
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em ems (font-relative unit traditionally used for horizontal lengths)
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ex exs (font-relative unit traditionally used for vertical lengths)
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px pixels, or pixel size of a "typical computer display"
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in inches (1 inch = 2.54 centimeters)
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cm centimeters
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mm millimeters
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pt points (1 point = 1/72 inch)
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pc picas (1 pica = 12 points)
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% percentage of default value
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Implementation here:
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The numeric value is valid only if it is of the form nnn.nnn [h/v-unit]
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*/
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// Adapted from nsCSSScanner.cpp & CSSParser.cpp
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PRBool
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nsMathMLContainerFrame::ParseNumericValue(nsString& aString,
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nsCSSValue& aCSSValue)
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{
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aCSSValue.Reset();
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aString.CompressWhitespace(); // aString is not a const in this code...
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PRInt32 stringLength = aString.Length();
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if (!stringLength) return PR_FALSE;
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nsAutoString number(aString);
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number.SetLength(0);
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nsAutoString unit(aString);
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unit.SetLength(0);
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// Gather up characters that make up the number
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PRBool gotDot = PR_FALSE;
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PRUnichar c;
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for (PRInt32 i = 0; i < stringLength; i++) {
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c = aString[i];
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if (gotDot && c == '.')
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return PR_FALSE; // two dots encountered
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else if (c == '.')
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gotDot = PR_TRUE;
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else if (!nsCRT::IsAsciiDigit(c)) {
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aString.Right(unit, stringLength - i);
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unit.CompressWhitespace(); // some authors leave blanks before the unit
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break;
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}
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number.Append(c);
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}
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#if 0
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char s1[50], s2[50], s3[50];
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aString.ToCString(s1, 50);
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number.ToCString(s2, 50);
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unit.ToCString(s3, 50);
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printf("String:%s, Number:%s, Unit:%s\n", s1, s2, s3);
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#endif
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// Convert number to floating point
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PRInt32 errorCode;
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float floatValue = number.ToFloat(&errorCode);
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if (NS_FAILED(errorCode)) return PR_FALSE;
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nsCSSUnit cssUnit;
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if (0 == unit.Length()) {
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cssUnit = eCSSUnit_Number; // no explicit unit, this is a number that will act as a multiplier
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}
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else if (unit.EqualsWithConversion("%")) {
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floatValue = floatValue / 100.0f;
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aCSSValue.SetPercentValue(floatValue);
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return PR_TRUE;
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}
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else if (unit.EqualsWithConversion("em")) cssUnit = eCSSUnit_EM;
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else if (unit.EqualsWithConversion("ex")) cssUnit = eCSSUnit_XHeight;
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else if (unit.EqualsWithConversion("px")) cssUnit = eCSSUnit_Pixel;
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else if (unit.EqualsWithConversion("in")) cssUnit = eCSSUnit_Inch;
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else if (unit.EqualsWithConversion("cm")) cssUnit = eCSSUnit_Centimeter;
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else if (unit.EqualsWithConversion("mm")) cssUnit = eCSSUnit_Millimeter;
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else if (unit.EqualsWithConversion("pt")) cssUnit = eCSSUnit_Point;
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else if (unit.EqualsWithConversion("pc")) cssUnit = eCSSUnit_Pica;
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else // unexpected unit
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return PR_FALSE;
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aCSSValue.SetFloatValue(floatValue, cssUnit);
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return PR_TRUE;
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}
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// Adapted from nsCSSStyleRule.cpp
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nscoord
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nsMathMLContainerFrame::CalcLength(nsIPresContext* aPresContext,
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nsIStyleContext* aStyleContext,
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const nsCSSValue& aCSSValue)
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{
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NS_ASSERTION(aCSSValue.IsLengthUnit(), "not a length unit");
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if (aCSSValue.IsFixedLengthUnit()) {
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return aCSSValue.GetLengthTwips();
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}
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nsCSSUnit unit = aCSSValue.GetUnit();
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if (eCSSUnit_Pixel == unit) {
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float p2t;
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aPresContext->GetScaledPixelsToTwips(&p2t);
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return NSFloatPixelsToTwips(aCSSValue.GetFloatValue(), p2t);
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}
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else if (eCSSUnit_EM == unit) {
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nsStyleFont font;
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aStyleContext->GetStyle(eStyleStruct_Font, font);
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return NSToCoordRound(aCSSValue.GetFloatValue() * (float)font.mFont.size);
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}
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else if (eCSSUnit_XHeight == unit) {
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nscoord xHeight;
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nsStyleFont font;
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aStyleContext->GetStyle(eStyleStruct_Font, font);
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nsCOMPtr<nsIFontMetrics> fm;
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aPresContext->GetMetricsFor(font.mFont, getter_AddRefs(fm));
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fm->GetXHeight(xHeight);
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return NSToCoordRound(aCSSValue.GetFloatValue() * (float)xHeight);
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}
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return 0;
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}
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PRBool
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nsMathMLContainerFrame::ParseNamedSpaceValue(nsIFrame* aMathMLmstyleFrame,
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nsString& aString,
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nsCSSValue& aCSSValue)
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{
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aCSSValue.Reset();
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aString.CompressWhitespace(); // aString is not a const in this code...
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if (!aString.Length()) return PR_FALSE;
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// See if it is one of the 'namedspace' (ranging 1/18em...7/18em)
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PRInt32 i = 0;
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nsIAtom* namedspaceAtom;
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if (aString.EqualsWithConversion("veryverythinmathspace"))
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{
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i = 1;
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namedspaceAtom = nsMathMLAtoms::veryverythinmathspace_;
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}
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else if (aString.EqualsWithConversion("verythinmathspace"))
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{
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i = 2;
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namedspaceAtom = nsMathMLAtoms::verythinmathspace_;
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}
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else if (aString.EqualsWithConversion("thinmathspace"))
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{
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i = 3;
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namedspaceAtom = nsMathMLAtoms::thinmathspace_;
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}
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else if (aString.EqualsWithConversion("mediummathspace"))
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{
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i = 4;
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namedspaceAtom = nsMathMLAtoms::mediummathspace_;
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}
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else if (aString.EqualsWithConversion("thickmathspace"))
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{
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i = 5;
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namedspaceAtom = nsMathMLAtoms::thickmathspace_;
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}
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else if (aString.EqualsWithConversion("verythickmathspace"))
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{
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i = 6;
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namedspaceAtom = nsMathMLAtoms::verythickmathspace_;
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}
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else if (aString.EqualsWithConversion("veryverythickmathspace"))
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{
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i = 7;
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namedspaceAtom = nsMathMLAtoms::veryverythickmathspace_;
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}
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if (0 != i)
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{
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if (aMathMLmstyleFrame)
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{
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// see if there is a <mstyle> that has overriden the default value
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// GetAttribute() will recurse all the way up into the <mstyle> hierarchy
|
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nsAutoString value;
|
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if (NS_CONTENT_ATTR_HAS_VALUE ==
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GetAttribute(nsnull, aMathMLmstyleFrame, namedspaceAtom, value))
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{
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if (ParseNumericValue(value, aCSSValue) &&
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aCSSValue.IsLengthUnit())
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{
|
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return PR_TRUE;
|
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}
|
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}
|
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}
|
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|
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// fall back to the default value
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aCSSValue.SetFloatValue(float(i)/float(18), eCSSUnit_EM);
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return PR_TRUE;
|
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}
|
|
|
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return PR_FALSE;
|
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}
|
|
|
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// -------------------------
|
|
// error handlers
|
|
// by default show the Unicode REPLACEMENT CHARACTER U+FFFD
|
|
// when a frame with bad markup can not be rendered
|
|
nsresult
|
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nsMathMLContainerFrame::ReflowError(nsIPresContext* aPresContext,
|
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nsIRenderingContext& aRenderingContext,
|
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nsHTMLReflowMetrics& aDesiredSize)
|
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{
|
|
nsresult rv;
|
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|
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// clear all other flags and record that there is an error with this frame
|
|
mEmbellishData.flags = 0;
|
|
mPresentationData.flags = NS_MATHML_ERROR;
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|
|
///////////////
|
|
// Set font
|
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nsStyleFont font;
|
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mStyleContext->GetStyle(eStyleStruct_Font, font);
|
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aRenderingContext.SetFont(font.mFont);
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|
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// bounding metrics
|
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nsAutoString errorMsg(PRUnichar(0xFFFD));
|
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rv = aRenderingContext.GetBoundingMetrics(errorMsg.GetUnicode(),
|
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PRUint32(errorMsg.Length()),
|
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mBoundingMetrics);
|
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if (NS_FAILED(rv)) {
|
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printf("GetBoundingMetrics failed\n");
|
|
aDesiredSize.width = aDesiredSize.height = 0;
|
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aDesiredSize.ascent = aDesiredSize.descent = 0;
|
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return NS_OK;
|
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}
|
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|
|
// reflow metrics
|
|
nsCOMPtr<nsIFontMetrics> fm;
|
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aRenderingContext.GetFontMetrics(*getter_AddRefs(fm));
|
|
fm->GetMaxAscent(aDesiredSize.ascent);
|
|
fm->GetMaxDescent(aDesiredSize.descent);
|
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aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
|
|
aDesiredSize.width = mBoundingMetrics.width;
|
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|
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if (nsnull != aDesiredSize.maxElementSize) {
|
|
aDesiredSize.maxElementSize->width = aDesiredSize.width;
|
|
aDesiredSize.maxElementSize->height = aDesiredSize.height;
|
|
}
|
|
// Also return our bounding metrics
|
|
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
|
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|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
nsMathMLContainerFrame::PaintError(nsIPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
const nsRect& aDirtyRect,
|
|
nsFramePaintLayer aWhichLayer)
|
|
{
|
|
if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer)
|
|
{
|
|
NS_ASSERTION(NS_MATHML_HAS_ERROR(mPresentationData.flags),
|
|
"There is nothing wrong with this frame!");
|
|
// Set color and font ...
|
|
nsStyleFont font;
|
|
nsStyleColor color;
|
|
mStyleContext->GetStyle(eStyleStruct_Font, font);
|
|
mStyleContext->GetStyle(eStyleStruct_Color, color);
|
|
aRenderingContext.SetColor(color.mColor);
|
|
aRenderingContext.SetFont(font.mFont);
|
|
|
|
nsAutoString errorMsg(PRUnichar(0xFFFD));
|
|
aRenderingContext.DrawString(errorMsg.GetUnicode(),
|
|
PRUint32(errorMsg.Length()),
|
|
mRect.x, mRect.y);
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
// -------------------------
|
|
|
|
void
|
|
nsMathMLContainerFrame::ReflowEmptyChild(nsIPresContext* aPresContext,
|
|
nsIFrame* aFrame)
|
|
{
|
|
// nsHTMLReflowMetrics emptySize(nsnull);
|
|
// nsHTMLReflowState emptyReflowState(aPresContext, aReflowState, aFrame, nsSize(0,0));
|
|
// nsresult rv = ReflowChild(aFrame, aPresContext, emptySize, emptyReflowState, aStatus);
|
|
|
|
// 0-size the frame
|
|
aFrame->SetRect(aPresContext, nsRect(0,0,0,0));
|
|
|
|
// 0-size the view, if any
|
|
nsIView* view = nsnull;
|
|
aFrame->GetView(aPresContext, &view);
|
|
if (view) {
|
|
nsCOMPtr<nsIViewManager> vm;
|
|
view->GetViewManager(*getter_AddRefs(vm));
|
|
vm->ResizeView(view, 0,0);
|
|
}
|
|
}
|
|
|
|
/* /////////////
|
|
* nsIMathMLFrame - support methods for precise positioning
|
|
* =============================================================================
|
|
*/
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::GetBoundingMetrics(nsBoundingMetrics& aBoundingMetrics)
|
|
{
|
|
aBoundingMetrics = mBoundingMetrics;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::SetBoundingMetrics(const nsBoundingMetrics& aBoundingMetrics)
|
|
{
|
|
mBoundingMetrics = aBoundingMetrics;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::GetReference(nsPoint& aReference)
|
|
{
|
|
aReference = mReference;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::SetReference(const nsPoint& aReference)
|
|
{
|
|
mReference = aReference;
|
|
return NS_OK;
|
|
}
|
|
|
|
// helper method to facilitate getting the reflow and bounding metrics
|
|
void
|
|
nsMathMLContainerFrame::GetReflowAndBoundingMetricsFor(nsIFrame* aFrame,
|
|
nsHTMLReflowMetrics& aReflowMetrics,
|
|
nsBoundingMetrics& aBoundingMetrics)
|
|
{
|
|
NS_PRECONDITION(aFrame, "null arg");
|
|
|
|
// IMPORTANT: This function is only meant to be called in Place() methods
|
|
// where it is assumed that the frame's rect is still acting as place holder
|
|
// for the frame's ascent and descent information
|
|
|
|
nsRect aRect;
|
|
aFrame->GetRect(aRect);
|
|
aReflowMetrics.descent = aRect.x;
|
|
aReflowMetrics.ascent = aRect.y;
|
|
aReflowMetrics.width = aRect.width;
|
|
aReflowMetrics.height = aRect.height;
|
|
|
|
aBoundingMetrics.Clear();
|
|
nsIMathMLFrame* aMathMLFrame = nsnull;
|
|
nsresult rv = aFrame->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&aMathMLFrame);
|
|
if (NS_SUCCEEDED(rv) && aMathMLFrame) {
|
|
aMathMLFrame->GetBoundingMetrics(aBoundingMetrics);
|
|
#if 0
|
|
nsFrame::ListTag(stdout, aFrame);
|
|
printf(" subItalicCorrection:%d supItalicCorrection:%d\n",
|
|
aBoundingMetrics.subItalicCorrection, aBoundingMetrics.supItalicCorrection);
|
|
#endif
|
|
}
|
|
else { // aFrame is not a MathML frame, just return the reflow metrics
|
|
aBoundingMetrics.descent = aReflowMetrics.descent;
|
|
aBoundingMetrics.ascent = aReflowMetrics.ascent;
|
|
aBoundingMetrics.width = aReflowMetrics.width;
|
|
#if 0
|
|
printf("GetBoundingMetrics() failed for: "); /* getchar(); */
|
|
nsFrame::ListTag(stdout, aFrame);
|
|
printf("\n");
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/* /////////////
|
|
* nsIMathMLFrame - support methods for stretchy elements
|
|
* =============================================================================
|
|
*/
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::Stretch(nsIPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
nsStretchDirection aStretchDirection,
|
|
nsBoundingMetrics& aContainerSize,
|
|
nsHTMLReflowMetrics& aDesiredStretchSize)
|
|
{
|
|
nsresult rv = NS_OK;
|
|
if (NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags)) {
|
|
|
|
if (NS_MATHML_STRETCH_WAS_DONE(mEmbellishData.flags)) {
|
|
printf("WARNING *** it is wrong to fire stretch more than once on a frame...\n");
|
|
// NS_ASSERTION(PR_FALSE,"Stretch() was fired more than once on a frame!");
|
|
return NS_OK;
|
|
}
|
|
mEmbellishData.flags |= NS_MATHML_STRETCH_DONE;
|
|
|
|
if (NS_MATHML_HAS_ERROR(mPresentationData.flags)) {
|
|
printf("WARNING *** it is wrong to fire stretch on a erroneous frame...\n");
|
|
return NS_OK;
|
|
}
|
|
|
|
// Pass the stretch to the first non-empty child ...
|
|
|
|
nsIFrame* childFrame = mEmbellishData.firstChild;
|
|
NS_ASSERTION(childFrame, "Something is wrong somewhere");
|
|
|
|
if (childFrame) {
|
|
nsIMathMLFrame* aMathMLFrame = nsnull;
|
|
rv = childFrame->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&aMathMLFrame);
|
|
NS_ASSERTION(NS_SUCCEEDED(rv) && aMathMLFrame, "Something is wrong somewhere");
|
|
if (NS_SUCCEEDED(rv) && aMathMLFrame) {
|
|
|
|
// And the trick is that the child's rect.x is still holding the descent,
|
|
// and rect.y is still holding the ascent ...
|
|
nsRect rect;
|
|
childFrame->GetRect(rect);
|
|
|
|
nsHTMLReflowMetrics childSize(aDesiredStretchSize);
|
|
aMathMLFrame->GetBoundingMetrics(childSize.mBoundingMetrics);
|
|
childSize.descent = rect.x;
|
|
childSize.ascent = rect.y;
|
|
childSize.height = rect.height;
|
|
childSize.width = rect.width;
|
|
|
|
nsBoundingMetrics containerSize = aContainerSize;
|
|
|
|
if (aStretchDirection != NS_STRETCH_DIRECTION_DEFAULT &&
|
|
aStretchDirection != mEmbellishData.direction) {
|
|
// change the direction and confine the stretch to us
|
|
// XXX tune this
|
|
containerSize = mBoundingMetrics;
|
|
}
|
|
|
|
// do the stretching...
|
|
aMathMLFrame->Stretch(aPresContext, aRenderingContext,
|
|
mEmbellishData.direction, containerSize, childSize);
|
|
|
|
// store the updated metrics
|
|
childFrame->SetRect(aPresContext,
|
|
nsRect(childSize.descent, childSize.ascent,
|
|
childSize.width, childSize.height));
|
|
|
|
// We now have one child that may have changed, re-position all our children
|
|
Place(aPresContext, aRenderingContext, PR_TRUE, aDesiredStretchSize);
|
|
|
|
// If our parent is not embellished, it means we are the outermost embellished
|
|
// container and so we put the spacing, otherwise we don't include the spacing,
|
|
// the outermost embellished container will take care of it.
|
|
|
|
if (!IsEmbellishOperator(mParent)) {
|
|
|
|
nsStyleFont font;
|
|
mStyleContext->GetStyle(eStyleStruct_Font, font);
|
|
nscoord em = NSToCoordRound(float(font.mFont.size));
|
|
|
|
nsEmbellishData coreData;
|
|
mEmbellishData.core->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&aMathMLFrame);
|
|
aMathMLFrame->GetEmbellishData(coreData);
|
|
|
|
// cache these values
|
|
mEmbellishData.leftSpace = coreData.leftSpace;
|
|
mEmbellishData.rightSpace = coreData.rightSpace;
|
|
|
|
aDesiredStretchSize.width +=
|
|
NSToCoordRound((coreData.leftSpace + coreData.rightSpace) * em);
|
|
|
|
// XXX is this what to do ?
|
|
aDesiredStretchSize.mBoundingMetrics.width +=
|
|
NSToCoordRound((coreData.leftSpace + coreData.rightSpace) * em);
|
|
|
|
nscoord dx = nscoord( coreData.leftSpace * em );
|
|
if (0 == dx) return NS_OK;
|
|
|
|
aDesiredStretchSize.mBoundingMetrics.leftBearing += dx;
|
|
aDesiredStretchSize.mBoundingMetrics.rightBearing += dx;
|
|
|
|
nsPoint origin;
|
|
childFrame = mFrames.FirstChild();
|
|
while (childFrame) {
|
|
childFrame->GetOrigin(origin);
|
|
childFrame->MoveTo(aPresContext, origin.x + dx, origin.y);
|
|
childFrame->GetNextSibling(&childFrame);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
nsMathMLContainerFrame::FinalizeReflow(nsIPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
nsHTMLReflowMetrics& aDesiredSize)
|
|
{
|
|
// During reflow, we use rect.x and rect.y as placeholders for the child's ascent
|
|
// and descent in expectation of a stretch command. Hence we need to ensure that
|
|
// a stretch command will actually be fired later on, after exiting from our
|
|
// reflow. If the stretch is not fired, the rect.x, and rect.y will remain
|
|
// with inappropriate data causing children to be improperly positioned.
|
|
// This helper method checks to see if our parent will fire a stretch command
|
|
// targeted at us. If not, we go ahead and fire an involutive stretch on
|
|
// ourselves. This will clear all the rect.x and rect.y, and return our
|
|
// desired size.
|
|
|
|
|
|
// First, complete the post-reflow hook.
|
|
// We use the information in our children rectangles to position them.
|
|
// If placeOrigin==false, then Place() will not touch rect.x, and rect.y.
|
|
// They will still be holding the ascent and descent for each child.
|
|
PRBool placeOrigin = !NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags);
|
|
Place(aPresContext, aRenderingContext, placeOrigin, aDesiredSize);
|
|
|
|
if (!placeOrigin) {
|
|
// This means the rect.x and rect.y of our children were not set!!
|
|
// Don't go without checking to see if our parent will later fire a Stretch() command
|
|
// targeted at us. The Stretch() will cause the rect.x and rect.y to clear...
|
|
PRBool parentWillFireStretch = PR_FALSE;
|
|
nsEmbellishData parentData;
|
|
nsIMathMLFrame* aMathMLFrame = nsnull;
|
|
nsresult rv = mParent->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&aMathMLFrame);
|
|
if (NS_SUCCEEDED(rv) && aMathMLFrame) {
|
|
aMathMLFrame->GetEmbellishData(parentData);
|
|
if (NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(parentData.flags) ||
|
|
NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(parentData.flags) ||
|
|
(NS_MATHML_IS_EMBELLISH_OPERATOR(parentData.flags)
|
|
&& parentData.firstChild == this))
|
|
{
|
|
parentWillFireStretch = PR_TRUE;
|
|
}
|
|
}
|
|
if (!parentWillFireStretch) {
|
|
// There is nobody who will fire the stretch for us, we do it ourselves!
|
|
|
|
// BEGIN of GETTING THE STRETCH SIZE
|
|
// What is the size that we should use to stretch our stretchy children ????
|
|
|
|
// 1) With this code, vertical stretching works. But horizontal stretching
|
|
// does not work when the firstChild happens to be the core embellished mo...
|
|
// nsRect rect;
|
|
// nsIFrame* childFrame = mEmbellishData.firstChild;
|
|
// NS_ASSERTION(childFrame, "Something is wrong somewhere");
|
|
// childFrame->GetRect(rect);
|
|
// nsStretchMetrics curSize(rect.x, rect.y, rect.width, rect.height);
|
|
|
|
|
|
// 2) With this code, horizontal stretching works. But vertical stretching
|
|
// is done in some cases where frames could have simply been kept as is.
|
|
// nsStretchMetrics curSize(aDesiredSize);
|
|
nsBoundingMetrics curSize = mBoundingMetrics;
|
|
|
|
|
|
// 3) With this code, we should get appropriate size when it is done !!
|
|
// GetDesiredSize(aDirection, aPresContext, aRenderingContext, curSize);
|
|
|
|
// XXX It is not clear if a direction should be imposed.
|
|
// With the default direction, the MathMLChar will attempt to stretch
|
|
// in its preferred direction.
|
|
|
|
Stretch(aPresContext, aRenderingContext, NS_STRETCH_DIRECTION_DEFAULT,
|
|
curSize, aDesiredSize);
|
|
}
|
|
}
|
|
if (nsnull != aDesiredSize.maxElementSize) {
|
|
aDesiredSize.maxElementSize->width = aDesiredSize.width;
|
|
aDesiredSize.maxElementSize->height = aDesiredSize.height;
|
|
}
|
|
// Also return our bounding metrics
|
|
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
|
|
return NS_OK;
|
|
}
|
|
|
|
// This is the method used to set the frame as an embellished container.
|
|
// It checks if the first (non-empty) child is embellished. Hence, calls
|
|
// must be bottom-up. The method must only be called from within frames who are
|
|
// entitled to be potential embellished operators as per the MathML REC.
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::EmbellishOperator()
|
|
{
|
|
// Get the first non-empty child
|
|
nsIFrame* firstChild = mFrames.FirstChild();
|
|
while (firstChild) {
|
|
if (!IsOnlyWhitespace(firstChild)) break;
|
|
firstChild->GetNextSibling(&firstChild);
|
|
}
|
|
if (firstChild && IsEmbellishOperator(firstChild)) {
|
|
// Cache the first child
|
|
mEmbellishData.flags |= NS_MATHML_EMBELLISH_OPERATOR;
|
|
mEmbellishData.firstChild = firstChild;
|
|
// Cache also the inner-most embellished frame at the core of the hierarchy
|
|
nsIMathMLFrame* aMathMLFrame = nsnull;
|
|
firstChild->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&aMathMLFrame);
|
|
nsEmbellishData embellishData;
|
|
aMathMLFrame->GetEmbellishData(embellishData);
|
|
mEmbellishData.core = embellishData.core;
|
|
mEmbellishData.direction = embellishData.direction;
|
|
}
|
|
else {
|
|
mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_OPERATOR;
|
|
mEmbellishData.firstChild = nsnull;
|
|
mEmbellishData.core = nsnull;
|
|
mEmbellishData.direction = NS_STRETCH_DIRECTION_UNSUPPORTED;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::GetEmbellishData(nsEmbellishData& aEmbellishData)
|
|
{
|
|
aEmbellishData = mEmbellishData;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::SetEmbellishData(const nsEmbellishData& aEmbellishData)
|
|
{
|
|
mEmbellishData = aEmbellishData;
|
|
return NS_OK;
|
|
}
|
|
|
|
PRBool
|
|
nsMathMLContainerFrame::IsEmbellishOperator(nsIFrame* aFrame)
|
|
{
|
|
NS_PRECONDITION(aFrame, "null arg");
|
|
if (!aFrame) return PR_FALSE;
|
|
nsIMathMLFrame* aMathMLFrame = nsnull;
|
|
nsresult rv = aFrame->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&aMathMLFrame);
|
|
if (NS_FAILED(rv) || !aMathMLFrame) return PR_FALSE;
|
|
nsEmbellishData aEmbellishData;
|
|
aMathMLFrame->GetEmbellishData(aEmbellishData);
|
|
return NS_MATHML_IS_EMBELLISH_OPERATOR(aEmbellishData.flags);
|
|
}
|
|
|
|
/* /////////////
|
|
* nsIMathMLFrame - support methods for scripting elements (nested frames
|
|
* within msub, msup, msubsup, munder, mover, munderover, mmultiscripts,
|
|
* mfrac, mroot, mtable).
|
|
* =============================================================================
|
|
*/
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::GetPresentationData(nsPresentationData& aPresentationData)
|
|
{
|
|
aPresentationData = mPresentationData;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::SetPresentationData(const nsPresentationData& aPresentationData)
|
|
{
|
|
mPresentationData = aPresentationData;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::UpdatePresentationData(PRInt32 aScriptLevelIncrement,
|
|
PRBool aDisplayStyle,
|
|
PRBool aCompressed)
|
|
{
|
|
mPresentationData.scriptLevel += aScriptLevelIncrement;
|
|
if (aDisplayStyle)
|
|
mPresentationData.flags |= NS_MATHML_DISPLAYSTYLE;
|
|
else
|
|
mPresentationData.flags &= ~NS_MATHML_DISPLAYSTYLE;
|
|
if (aCompressed) {
|
|
// 'compressed' means 'prime' style in App. G, TeXbook
|
|
// (the flag retains its value once it is set)
|
|
mPresentationData.flags |= NS_MATHML_COMPRESSED;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::UpdatePresentationDataFromChildAt(PRInt32 aIndex,
|
|
PRInt32 aScriptLevelIncrement,
|
|
PRBool aDisplayStyle,
|
|
PRBool aCompressed)
|
|
{
|
|
nsIFrame* childFrame = mFrames.FirstChild();
|
|
while (nsnull != childFrame) {
|
|
if (!IsOnlyWhitespace(childFrame)) {
|
|
if (0 >= aIndex--) {
|
|
nsIMathMLFrame* aMathMLFrame = nsnull;
|
|
nsresult rv = childFrame->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&aMathMLFrame);
|
|
if (NS_SUCCEEDED(rv) && nsnull != aMathMLFrame) {
|
|
// update
|
|
aMathMLFrame->UpdatePresentationData(aScriptLevelIncrement, aDisplayStyle, aCompressed);
|
|
// propagate down the subtrees
|
|
aMathMLFrame->UpdatePresentationDataFromChildAt(0, aScriptLevelIncrement, aDisplayStyle, aCompressed);
|
|
}
|
|
}
|
|
}
|
|
childFrame->GetNextSibling(&childFrame);
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
PRInt32
|
|
nsMathMLContainerFrame::FindSmallestFontSizeFor(nsIPresContext* aPresContext,
|
|
nsIFrame* aFrame)
|
|
{
|
|
nsStyleFont aFont;
|
|
nsCOMPtr<nsIStyleContext> aStyleContext;
|
|
aFrame->GetStyleContext(getter_AddRefs(aStyleContext));
|
|
aStyleContext->GetStyle(eStyleStruct_Font, aFont);
|
|
PRInt32 fontSize = aFont.mFont.size;
|
|
|
|
PRInt32 childSize;
|
|
nsIFrame* childFrame;
|
|
aFrame->FirstChild(aPresContext, nsnull, &childFrame);
|
|
while (nsnull != childFrame) {
|
|
if (!IsOnlyWhitespace(childFrame)) {
|
|
childSize = FindSmallestFontSizeFor(aPresContext, childFrame);
|
|
if (fontSize > childSize) fontSize = childSize;
|
|
}
|
|
childFrame->GetNextSibling(&childFrame);
|
|
}
|
|
return fontSize;
|
|
}
|
|
|
|
// Helper to give a style context suitable for doing the stretching of
|
|
// a MathMLChar. Frame classes that use this should ensure that the
|
|
// extra leaf style contexts given to the MathMLChars are acessible to
|
|
// the Style System via the Get/Set AdditionalStyleContext() APIs.
|
|
PRBool
|
|
nsMathMLContainerFrame::ResolveMathMLCharStyle(nsIPresContext* aPresContext,
|
|
nsIContent* aContent,
|
|
nsIStyleContext* aParentStyleContext,
|
|
nsMathMLChar* aMathMLChar)
|
|
{
|
|
nsAutoString data;
|
|
aMathMLChar->GetData(data);
|
|
PRBool isStretchy = nsMathMLOperators::IsMutableOperator(data);
|
|
nsIAtom* fontAtom = (isStretchy) ?
|
|
nsMathMLAtoms::fontstyle_stretchy :
|
|
nsMathMLAtoms::fontstyle_anonymous;
|
|
nsCOMPtr<nsIStyleContext> newStyleContext;
|
|
nsresult rv = aPresContext->ResolvePseudoStyleContextFor(aContent, fontAtom,
|
|
aParentStyleContext, PR_FALSE,
|
|
getter_AddRefs(newStyleContext));
|
|
if (NS_SUCCEEDED(rv) && newStyleContext)
|
|
aMathMLChar->SetStyleContext(newStyleContext);
|
|
|
|
return isStretchy;
|
|
}
|
|
|
|
// helper method to alter the style context
|
|
// This method is used for switching the font to a subscript/superscript font in
|
|
// mfrac, msub, msup, msubsup, munder, mover, munderover, mmultiscripts
|
|
|
|
// XXX change the code to ensure that the size decreases in a top-down manner.
|
|
// the coide should always insert top-scriptstyle frames, and inner frames that
|
|
// cause the size to decrease pass the smallest limit should be removed
|
|
nsresult
|
|
nsMathMLContainerFrame::InsertScriptLevelStyleContext(nsIPresContext* aPresContext)
|
|
{
|
|
nsresult rv = NS_OK;
|
|
nsIFrame* nextFrame = mFrames.FirstChild();
|
|
while (nsnull != nextFrame && NS_SUCCEEDED(rv)) {
|
|
nsIFrame* childFrame = nextFrame;
|
|
rv = nextFrame->GetNextSibling(&nextFrame);
|
|
if (!IsOnlyWhitespace(childFrame) && NS_SUCCEEDED(rv)) {
|
|
|
|
// see if the child frame implements the nsIMathMLFrame interface
|
|
nsIMathMLFrame* aMathMLFrame = nsnull;
|
|
rv = childFrame->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&aMathMLFrame);
|
|
if (nsnull != aMathMLFrame && NS_SUCCEEDED(rv)) {
|
|
|
|
// get the scriptlevel of the child
|
|
nsPresentationData childData;
|
|
aMathMLFrame->GetPresentationData(childData);
|
|
|
|
// Iteration to set a style context for the script level font.
|
|
// Wow, here is what is happening: the style system requires that any style context
|
|
// *must* be uniquely associated to a frame. So we insert as many frames as needed
|
|
// to scale-down (or scale-up) the fontsize.
|
|
|
|
PRInt32 gap = childData.scriptLevel - mPresentationData.scriptLevel;
|
|
if (0 != gap) {
|
|
// We are about to change the font-size... We first see if we
|
|
// are in the scope of a <mstyle> that tells us what to do.
|
|
// This is one of the most obscure part to implement in the spec...
|
|
/*
|
|
The REC says:
|
|
|
|
Whenever the scriptlevel is changed, either automatically or by being
|
|
explicitly incremented, decremented, or set, the current font size is
|
|
multiplied by the value of scriptsizemultiplier to the power of the
|
|
change in scriptlevel. For example, if scriptlevel is increased by 2,
|
|
the font size is multiplied by scriptsizemultiplier twice in succession;
|
|
if scriptlevel is explicitly set to 2 when it had been 3, the font size
|
|
is divided by scriptsizemultiplier.
|
|
|
|
The default value of scriptsizemultiplier is less than one (in fact, it
|
|
is approximately the square root of 1/2), resulting in a smaller font size
|
|
with increasing scriptlevel. To prevent scripts from becoming unreadably
|
|
small, the font size is never allowed to go below the value of
|
|
scriptminsize as a result of a change to scriptlevel, though it can be
|
|
set to a lower value using the fontsize attribute on <mstyle> or on
|
|
token elements. If a change to scriptlevel would cause the font size to
|
|
become lower than scriptminsize using the above formula, the font size
|
|
is instead set equal to scriptminsize within the subexpression for which
|
|
scriptlevel was changed.
|
|
|
|
In the syntax for scriptminsize, v-unit represents a unit of vertical
|
|
length. The most common unit for specifying font sizes in typesetting
|
|
is pt (points).
|
|
*/
|
|
|
|
// default scriptsizemultiplier = 0.71
|
|
// default scriptminsize = 8pt
|
|
|
|
// here we only consider scriptminsize, and use the default
|
|
// smaller-font-size algorithm of the style system
|
|
PRInt32 scriptminsize = NSIntPointsToTwips(8);
|
|
|
|
// see if there is a scriptminsize attribute on a <mstyle> that wraps us
|
|
nsAutoString value;
|
|
if (NS_CONTENT_ATTR_HAS_VALUE ==
|
|
GetAttribute(nsnull, mPresentationData.mstyle,
|
|
nsMathMLAtoms::scriptminsize_, value))
|
|
{
|
|
nsCSSValue cssValue;
|
|
if (ParseNumericValue(value, cssValue)) {
|
|
nsCSSUnit unit = cssValue.GetUnit();
|
|
if (eCSSUnit_Number == unit)
|
|
scriptminsize = nscoord(float(scriptminsize) * cssValue.GetFloatValue());
|
|
else if (eCSSUnit_Percent == unit)
|
|
scriptminsize = nscoord(float(scriptminsize) * cssValue.GetPercentValue());
|
|
else if (eCSSUnit_Null != unit)
|
|
scriptminsize = CalcLength(aPresContext, mStyleContext, cssValue);
|
|
}
|
|
#ifdef NS_DEBUG
|
|
else {
|
|
char str[50];
|
|
value.ToCString(str, 50);
|
|
printf("Invalid attribute scriptminsize=%s\n", str);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
// get Nav's magic font scaler
|
|
PRInt32 scaler;
|
|
aPresContext->GetFontScaler(&scaler);
|
|
float scaleFactor = nsStyleUtil::GetScalingFactor(scaler);
|
|
const nsFont& defaultFont = aPresContext->GetDefaultFontDeprecated();
|
|
|
|
nsCOMPtr<nsIContent> childContent;
|
|
childFrame->GetContent(getter_AddRefs(childContent));
|
|
|
|
nsCOMPtr<nsIPresShell> shell;
|
|
aPresContext->GetShell(getter_AddRefs(shell));
|
|
|
|
nsIFrame* firstFrame = nsnull;
|
|
nsIFrame* lastFrame = this;
|
|
nsIStyleContext* lastStyleContext = mStyleContext;
|
|
nsCOMPtr<nsIStyleContext> newStyleContext;
|
|
|
|
// XXX seems not to decrease when the initail font-size is large (100pt)
|
|
nsIAtom* fontAtom = (0 < gap) ?
|
|
nsMathMLAtoms::fontsize_smaller :
|
|
nsMathMLAtoms::fontsize_larger;
|
|
|
|
PRBool isSmaller = PR_TRUE;
|
|
if (0 > gap) { isSmaller = PR_FALSE; gap = -gap; } // absolute value
|
|
|
|
PRInt32 smallestFontIndex, smallestFontSize = 0;
|
|
if (isSmaller) {
|
|
// find the smallest font-size in this subtree
|
|
smallestFontSize = FindSmallestFontSizeFor(aPresContext, childFrame);
|
|
}
|
|
|
|
while (0 < gap--) {
|
|
|
|
if (isSmaller) {
|
|
// look ahead for the next smallest font size that will be in the subtree
|
|
smallestFontIndex = nsStyleUtil::FindNextSmallerFontSize(smallestFontSize, (PRInt32)defaultFont.size, scaleFactor, aPresContext);
|
|
smallestFontSize = nsStyleUtil::CalcFontPointSize(smallestFontIndex, (PRInt32)defaultFont.size, scaleFactor, aPresContext);
|
|
//((nsFrame*)childFrame)->ListTag(stdout);
|
|
//printf(" About to move to fontsize:%dpt(%dtwips)\n",
|
|
//NSTwipsToFloorIntPoints(smallestFontSize), smallestFontSize);
|
|
if (smallestFontSize < scriptminsize) {
|
|
// don't bother doing any work
|
|
//printf("..... stopping ......\n");
|
|
// XXX there should be a mechanism so that we never try this subtree again
|
|
break;
|
|
}
|
|
}
|
|
|
|
aPresContext->ResolvePseudoStyleContextFor(childContent, fontAtom, lastStyleContext,
|
|
PR_FALSE, getter_AddRefs(newStyleContext));
|
|
if (newStyleContext && newStyleContext.get() != lastStyleContext) {
|
|
// create a new wrapper frame and append it as sole child of the last created frame
|
|
nsIFrame* newFrame = nsnull;
|
|
NS_NewMathMLWrapperFrame(shell, &newFrame);
|
|
NS_ASSERTION(newFrame, "Failed to create new frame");
|
|
if (!newFrame) break;
|
|
newFrame->Init(aPresContext, childContent, lastFrame, newStyleContext, nsnull);
|
|
|
|
if (nsnull == firstFrame) {
|
|
firstFrame = newFrame;
|
|
}
|
|
if (this != lastFrame) {
|
|
lastFrame->SetInitialChildList(aPresContext, nsnull, newFrame);
|
|
}
|
|
lastStyleContext = newStyleContext;
|
|
lastFrame = newFrame;
|
|
}
|
|
else {
|
|
break;
|
|
}
|
|
}
|
|
if (nsnull != firstFrame) { // at least one new frame was created
|
|
mFrames.ReplaceFrame(this, childFrame, firstFrame);
|
|
childFrame->SetParent(lastFrame);
|
|
childFrame->SetNextSibling(nsnull);
|
|
aPresContext->ReParentStyleContext(childFrame, lastStyleContext);
|
|
lastFrame->SetInitialChildList(aPresContext, nsnull, childFrame);
|
|
|
|
// if the child was an embellished operator,
|
|
// make the whole list embellished as well
|
|
nsEmbellishData embellishData;
|
|
aMathMLFrame->GetEmbellishData(embellishData);
|
|
if (0 != embellishData.flags && nsnull != embellishData.firstChild) {
|
|
do { // walk the hierarchy in a bottom-up manner
|
|
rv = lastFrame->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&aMathMLFrame);
|
|
NS_ASSERTION(NS_SUCCEEDED(rv) && aMathMLFrame, "Mystery!");
|
|
if (NS_FAILED(rv) || !aMathMLFrame) break;
|
|
embellishData.firstChild = childFrame;
|
|
aMathMLFrame->SetEmbellishData(embellishData);
|
|
childFrame = lastFrame;
|
|
lastFrame->GetParent(&lastFrame);
|
|
} while (lastFrame != this);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
|
|
/* //////////////////
|
|
* Frame construction
|
|
* =============================================================================
|
|
*/
|
|
|
|
#if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::Paint(nsIPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
const nsRect& aDirtyRect,
|
|
nsFramePaintLayer aWhichLayer)
|
|
{
|
|
nsresult rv = NS_OK;
|
|
|
|
// report an error if something wrong was found in this frame
|
|
if (NS_MATHML_HAS_ERROR(mPresentationData.flags)) {
|
|
return PaintError(aPresContext, aRenderingContext,
|
|
aDirtyRect, aWhichLayer);
|
|
}
|
|
|
|
rv = nsHTMLContainerFrame::Paint(aPresContext, aRenderingContext,
|
|
aDirtyRect, aWhichLayer);
|
|
|
|
// for visual debug
|
|
// ----------------
|
|
// if you want to see your bounding box, make sure to properly fill
|
|
// your mBoundingMetrics and mReference point, and set
|
|
// mPresentationData.flags |= NS_MATHML_SHOW_BOUNDING_METRICS
|
|
// in the Init() of your sub-class
|
|
|
|
if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer &&
|
|
NS_MATHML_PAINT_BOUNDING_METRICS(mPresentationData.flags))
|
|
{
|
|
aRenderingContext.SetColor(NS_RGB(0,0,255));
|
|
|
|
nscoord x = mReference.x + mBoundingMetrics.leftBearing;
|
|
nscoord y = mReference.y - mBoundingMetrics.ascent;
|
|
nscoord w = mBoundingMetrics.rightBearing - mBoundingMetrics.leftBearing;
|
|
nscoord h = mBoundingMetrics.ascent + mBoundingMetrics.descent;
|
|
|
|
aRenderingContext.DrawRect(x,y,w,h);
|
|
}
|
|
return rv;
|
|
}
|
|
#endif
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::Init(nsIPresContext* aPresContext,
|
|
nsIContent* aContent,
|
|
nsIFrame* aParent,
|
|
nsIStyleContext* aContext,
|
|
nsIFrame* aPrevInFlow)
|
|
{
|
|
nsresult rv;
|
|
// first, let the base class do its Init()
|
|
rv = nsHTMLContainerFrame::Init(aPresContext, aContent, aParent, aContext, aPrevInFlow);
|
|
|
|
mBoundingMetrics.Clear();
|
|
mReference.x = mReference.y = 0;
|
|
|
|
// now, if our parent implements the nsIMathMLFrame interface, we inherit
|
|
// its scriptlevel and displaystyle. If the parent later wishes to increment
|
|
// with other values, it will do so in its SetInitialChildList() method.
|
|
|
|
mPresentationData.flags = 0;
|
|
mPresentationData.scriptLevel = 0;
|
|
mPresentationData.mstyle = nsnull;
|
|
|
|
mEmbellishData.flags = 0;
|
|
mEmbellishData.firstChild = nsnull;
|
|
|
|
nsIMathMLFrame* aMathMLFrame = nsnull;
|
|
nsresult res = aParent->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&aMathMLFrame);
|
|
if (NS_SUCCEEDED(res) && nsnull != aMathMLFrame) {
|
|
nsPresentationData parentData;
|
|
aMathMLFrame->GetPresentationData(parentData);
|
|
|
|
mPresentationData.mstyle = parentData.mstyle;
|
|
mPresentationData.scriptLevel = parentData.scriptLevel;
|
|
if (NS_MATHML_IS_DISPLAYSTYLE(parentData.flags))
|
|
mPresentationData.flags |= NS_MATHML_DISPLAYSTYLE;
|
|
else
|
|
mPresentationData.flags &= ~NS_MATHML_DISPLAYSTYLE;
|
|
}
|
|
else {
|
|
// see if our parent has 'display: block'
|
|
// XXX should we restrict this to the top level <math> parent ?
|
|
const nsStyleDisplay* display;
|
|
aParent->GetStyleData(eStyleStruct_Display, (const nsStyleStruct*&)display);
|
|
if (display->mDisplay == NS_STYLE_DISPLAY_BLOCK) {
|
|
mPresentationData.flags |= NS_MATHML_DISPLAYSTYLE;
|
|
}
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::SetInitialChildList(nsIPresContext* aPresContext,
|
|
nsIAtom* aListName,
|
|
nsIFrame* aChildList)
|
|
{
|
|
// First, let the base class do its job
|
|
nsresult rv;
|
|
rv = nsHTMLContainerFrame::SetInitialChildList(aPresContext, aListName, aChildList);
|
|
|
|
// Next, since we are an inline frame, and since we are a container, we have to
|
|
// be very careful with the way we treat our children. Things look okay when
|
|
// all of our children are only MathML frames. But there are problems if one of
|
|
// our children happens to be an nsInlineFrame, e.g., from generated content such
|
|
// as :before { content: open-quote } or :after { content: close-quote }
|
|
// The code asserts during reflow (in nsLineLayout::BeginSpan)
|
|
// Also there are problems when our children are hybrid, e.g., from html markups.
|
|
// In short, the nsInlineFrame class expects a number of *invariants* that are not
|
|
// met when we mix things.
|
|
|
|
// So what we do here is to wrap children that happen to be nsInlineFrames in
|
|
// anonymous block frames.
|
|
// XXX Question: Do we have to handle Insert/Remove/Append on behalf of
|
|
// these anonymous blocks?
|
|
// Note: By construction, our anonymous blocks have only one child.
|
|
|
|
nsIFrame* next = mFrames.FirstChild();
|
|
while (next) {
|
|
nsIFrame* child = next;
|
|
next->GetNextSibling(&next);
|
|
if (!IsOnlyWhitespace(child)) {
|
|
nsInlineFrame* inlineFrame = nsnull;
|
|
nsresult res = child->QueryInterface(nsInlineFrame::kInlineFrameCID, (void**)&inlineFrame);
|
|
if (NS_SUCCEEDED(res) && inlineFrame) {
|
|
// create a new anonymous block frame to wrap this child...
|
|
nsCOMPtr<nsIPresShell> shell;
|
|
aPresContext->GetShell(getter_AddRefs(shell));
|
|
nsIFrame* anonymous;
|
|
rv = NS_NewBlockFrame(shell, &anonymous);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
nsCOMPtr<nsIStyleContext> newStyleContext;
|
|
aPresContext->ResolvePseudoStyleContextFor(mContent, nsHTMLAtoms::mozAnonymousBlock,
|
|
mStyleContext, PR_FALSE,
|
|
getter_AddRefs(newStyleContext));
|
|
rv = anonymous->Init(aPresContext, mContent, this, newStyleContext, nsnull);
|
|
if (NS_FAILED(rv)) {
|
|
anonymous->Destroy(aPresContext);
|
|
return rv;
|
|
}
|
|
mFrames.ReplaceFrame(this, child, anonymous);
|
|
child->SetParent(anonymous);
|
|
child->SetNextSibling(nsnull);
|
|
aPresContext->ReParentStyleContext(child, newStyleContext);
|
|
anonymous->SetInitialChildList(aPresContext, nsnull, child);
|
|
}
|
|
}
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
// helper function to reflow token elements
|
|
// note that mBoundingMetrics is computed here
|
|
nsresult
|
|
nsMathMLContainerFrame::ReflowTokenFor(nsIFrame* aFrame,
|
|
nsIPresContext* aPresContext,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aStatus)
|
|
{
|
|
NS_PRECONDITION(aFrame, "null arg");
|
|
nsresult rv = NS_OK;
|
|
|
|
// See if this is an incremental reflow
|
|
if (aReflowState.reason == eReflowReason_Incremental) {
|
|
nsIFrame* targetFrame;
|
|
aReflowState.reflowCommand->GetTarget(targetFrame);
|
|
#ifdef MATHML_NOISY_INCREMENTAL_REFLOW
|
|
printf("nsMathMLContainerFrame::ReflowTokenFor:IncrementalReflow received by: ");
|
|
nsFrame::ListTag(stdout, aFrame);
|
|
printf("for target: ");
|
|
nsFrame::ListTag(stdout, targetFrame);
|
|
printf("\n");
|
|
#endif
|
|
if (aFrame == targetFrame) {
|
|
}
|
|
else {
|
|
// Remove the next frame from the reflow path
|
|
nsIFrame* nextFrame;
|
|
aReflowState.reflowCommand->GetNext(nextFrame);
|
|
}
|
|
}
|
|
|
|
// initializations needed for empty markup like <mtag></mtag>
|
|
aDesiredSize.width = aDesiredSize.height = 0;
|
|
aDesiredSize.ascent = aDesiredSize.descent = 0;
|
|
aDesiredSize.mBoundingMetrics.Clear();
|
|
|
|
// ask our children to compute their bounding metrics
|
|
nsHTMLReflowMetrics childDesiredSize(aDesiredSize.maxElementSize,
|
|
aDesiredSize.mFlags | NS_REFLOW_CALC_BOUNDING_METRICS);
|
|
nsSize availSize(aReflowState.mComputedWidth, aReflowState.mComputedHeight);
|
|
PRInt32 count = 0;
|
|
nsIFrame* childFrame;
|
|
aFrame->FirstChild(aPresContext, nsnull, &childFrame);
|
|
while (childFrame) {
|
|
if (IsOnlyWhitespace(childFrame)) {
|
|
ReflowEmptyChild(aPresContext, childFrame);
|
|
}
|
|
else {
|
|
nsHTMLReflowState childReflowState(aPresContext, aReflowState,
|
|
childFrame, availSize);
|
|
rv = NS_STATIC_CAST(nsMathMLContainerFrame*,
|
|
aFrame)->ReflowChild(childFrame,
|
|
aPresContext, childDesiredSize,
|
|
childReflowState, aStatus);
|
|
NS_ASSERTION(NS_FRAME_IS_COMPLETE(aStatus), "bad status");
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
// origins are used as placeholders to store the child's ascent and descent.
|
|
childFrame->SetRect(aPresContext,
|
|
nsRect(childDesiredSize.descent, childDesiredSize.ascent,
|
|
childDesiredSize.width, childDesiredSize.height));
|
|
// compute and cache the bounding metrics
|
|
if (0 == count)
|
|
aDesiredSize.mBoundingMetrics = childDesiredSize.mBoundingMetrics;
|
|
else
|
|
aDesiredSize.mBoundingMetrics += childDesiredSize.mBoundingMetrics;
|
|
|
|
count++;
|
|
}
|
|
rv = childFrame->GetNextSibling(&childFrame);
|
|
NS_ASSERTION(NS_SUCCEEDED(rv),"failed to get next child");
|
|
}
|
|
// cache the frame's mBoundingMetrics
|
|
NS_STATIC_CAST(nsMathMLContainerFrame*,
|
|
aFrame)->SetBoundingMetrics(aDesiredSize.mBoundingMetrics);
|
|
// place and size children
|
|
NS_STATIC_CAST(nsMathMLContainerFrame*,
|
|
aFrame)->FinalizeReflow(aPresContext, *aReflowState.rendContext,
|
|
aDesiredSize);
|
|
return NS_OK;
|
|
}
|
|
|
|
// helper function to place token elements
|
|
// mBoundingMetrics is computed at the ReflowToken pass, it is
|
|
// not computed here because our children may be text frames that
|
|
// do not implement the GetBoundingMetrics() interface.
|
|
nsresult
|
|
nsMathMLContainerFrame::PlaceTokenFor(nsIFrame* aFrame,
|
|
nsIPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
PRBool aPlaceOrigin,
|
|
nsHTMLReflowMetrics& aDesiredSize)
|
|
{
|
|
aDesiredSize.width = aDesiredSize.height = 0;
|
|
aDesiredSize.ascent = aDesiredSize.descent = 0;
|
|
|
|
nsRect rect;
|
|
nsIFrame* childFrame;
|
|
aFrame->FirstChild(aPresContext, nsnull, &childFrame);
|
|
while (childFrame) {
|
|
if (!IsOnlyWhitespace(childFrame)) {
|
|
childFrame->GetRect(rect);
|
|
aDesiredSize.width += rect.width;
|
|
if (aDesiredSize.descent < rect.x) aDesiredSize.descent = rect.x;
|
|
if (aDesiredSize.ascent < rect.y) aDesiredSize.ascent = rect.y;
|
|
}
|
|
childFrame->GetNextSibling(&childFrame);
|
|
}
|
|
aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
|
|
NS_STATIC_CAST(nsMathMLContainerFrame*,
|
|
aFrame)->GetBoundingMetrics(aDesiredSize.mBoundingMetrics);
|
|
|
|
if (aPlaceOrigin) {
|
|
nscoord dy, dx = 0;
|
|
aFrame->FirstChild(aPresContext, nsnull, &childFrame);
|
|
while (childFrame) {
|
|
childFrame->GetRect(rect);
|
|
nsHTMLReflowMetrics childSize(nsnull);
|
|
childSize.width = rect.width;
|
|
childSize.height = rect.height;
|
|
|
|
// place and size the child
|
|
dy = aDesiredSize.ascent - rect.y;
|
|
NS_STATIC_CAST(nsMathMLContainerFrame*,
|
|
aFrame)->FinishReflowChild(childFrame, aPresContext,
|
|
childSize, dx, dy, 0);
|
|
dx += rect.width;
|
|
childFrame->GetNextSibling(&childFrame);
|
|
}
|
|
}
|
|
NS_STATIC_CAST(nsMathMLContainerFrame*,
|
|
aFrame)->SetReference(nsPoint(0, aDesiredSize.ascent));
|
|
return NS_OK;
|
|
}
|
|
|
|
// We are an inline frame, so we handle dirty request like nsInlineFrame
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::ReflowDirtyChild(nsIPresShell* aPresShell, nsIFrame* aChild)
|
|
{
|
|
// The inline container frame does not handle the reflow
|
|
// request. It passes it up to its parent container.
|
|
|
|
// If you don't already have dirty children,
|
|
if (!(mState & NS_FRAME_HAS_DIRTY_CHILDREN)) {
|
|
if (mParent) {
|
|
// Record that you are dirty and have dirty children
|
|
mState |= NS_FRAME_IS_DIRTY;
|
|
mState |= NS_FRAME_HAS_DIRTY_CHILDREN;
|
|
|
|
// Pass the reflow request up to the parent
|
|
mParent->ReflowDirtyChild(aPresShell, (nsIFrame*) this);
|
|
}
|
|
else {
|
|
NS_ASSERTION(0, "No parent to pass the reflow request up to.");
|
|
}
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::Reflow(nsIPresContext* aPresContext,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aStatus)
|
|
{
|
|
nsresult rv;
|
|
aDesiredSize.width = aDesiredSize.height = 0;
|
|
aDesiredSize.ascent = aDesiredSize.descent = 0;
|
|
aDesiredSize.mBoundingMetrics.Clear();
|
|
|
|
// See if this is an incremental reflow
|
|
if (aReflowState.reason == eReflowReason_Incremental) {
|
|
nsIFrame* targetFrame;
|
|
aReflowState.reflowCommand->GetTarget(targetFrame);
|
|
#ifdef MATHML_NOISY_INCREMENTAL_REFLOW
|
|
printf("nsMathMLContainerFrame::Reflow:IncrementalReflow received by: ");
|
|
nsFrame::ListTag(stdout, this);
|
|
printf("for target: ");
|
|
nsFrame::ListTag(stdout, targetFrame);
|
|
printf("\n");
|
|
#endif
|
|
if (this == targetFrame) {
|
|
// XXX We are the target of the incremental reflow.
|
|
// Rather than reflowing everything, see if we can speedup things
|
|
// by just doing the minimal work needed to update ourselves
|
|
}
|
|
else {
|
|
// Remove the next frame from the reflow path
|
|
nsIFrame* nextFrame;
|
|
aReflowState.reflowCommand->GetNext(nextFrame);
|
|
}
|
|
}
|
|
|
|
/////////////
|
|
// Reflow children
|
|
// Asking each child to cache its bounding metrics
|
|
|
|
nsReflowStatus childStatus;
|
|
nsSize availSize(aReflowState.mComputedWidth, aReflowState.mComputedHeight);
|
|
nsHTMLReflowMetrics childDesiredSize(aDesiredSize.maxElementSize,
|
|
aDesiredSize.mFlags | NS_REFLOW_CALC_BOUNDING_METRICS);
|
|
nsIFrame* childFrame = mFrames.FirstChild();
|
|
while (childFrame) {
|
|
//////////////
|
|
// WHITESPACE: don't forget that whitespace doesn't count in MathML!
|
|
if (IsOnlyWhitespace(childFrame)) {
|
|
ReflowEmptyChild(aPresContext, childFrame);
|
|
}
|
|
else {
|
|
nsHTMLReflowState childReflowState(aPresContext, aReflowState,
|
|
childFrame, availSize);
|
|
rv = ReflowChild(childFrame, aPresContext, childDesiredSize,
|
|
childReflowState, childStatus);
|
|
NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status");
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
// At this stage, the origin points of the children have no use, so we will use the
|
|
// origins as placeholders to store the child's ascent and descent. Later on,
|
|
// we should set the origins so as to overwrite what we are storing there now.
|
|
childFrame->SetRect(aPresContext,
|
|
nsRect(childDesiredSize.descent, childDesiredSize.ascent,
|
|
childDesiredSize.width, childDesiredSize.height));
|
|
}
|
|
rv = childFrame->GetNextSibling(&childFrame);
|
|
NS_ASSERTION(NS_SUCCEEDED(rv),"failed to get next child");
|
|
}
|
|
|
|
/////////////
|
|
// If we are a container which is entitled to stretch its children, then we
|
|
// ask our stretchy children to stretch themselves
|
|
|
|
if (NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mEmbellishData.flags) ||
|
|
NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mEmbellishData.flags)) {
|
|
|
|
// get our tentative bounding metrics using Place()
|
|
Place(aPresContext, *aReflowState.rendContext, PR_FALSE, aDesiredSize);
|
|
|
|
// What size should we use to stretch our stretchy children
|
|
// XXX tune this
|
|
nsBoundingMetrics containerSize = mBoundingMetrics;
|
|
|
|
// get the strech direction
|
|
nsStretchDirection stretchDir =
|
|
NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mEmbellishData.flags) ?
|
|
NS_STRETCH_DIRECTION_VERTICAL : NS_STRETCH_DIRECTION_HORIZONTAL;
|
|
|
|
// fire the stretch on each child
|
|
childFrame = mFrames.FirstChild();
|
|
while (childFrame) {
|
|
if (mEmbellishData.firstChild == childFrame) {
|
|
// skip this child... because:
|
|
// If we are here it means we are an embellished container and
|
|
// for now, we don't touch our embellished child frame.
|
|
// Its stretch will be handled separatedly when we receive
|
|
// the stretch command fired by our parent frame.
|
|
}
|
|
else if (!IsOnlyWhitespace(childFrame)) {
|
|
nsIMathMLFrame* aMathMLFrame = nsnull;
|
|
rv = childFrame->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&aMathMLFrame);
|
|
if (NS_SUCCEEDED(rv) && aMathMLFrame) {
|
|
// retrieve the metrics that was stored at the previous pass
|
|
nsRect rect;
|
|
childFrame->GetRect(rect);
|
|
aMathMLFrame->GetBoundingMetrics(childDesiredSize.mBoundingMetrics);
|
|
childDesiredSize.descent = rect.x;
|
|
childDesiredSize.ascent = rect.y;
|
|
childDesiredSize.height = rect.height;
|
|
childDesiredSize.width = rect.width;
|
|
|
|
aMathMLFrame->Stretch(aPresContext, *aReflowState.rendContext,
|
|
stretchDir, containerSize, childDesiredSize);
|
|
// store the updated metrics
|
|
childFrame->SetRect(aPresContext,
|
|
nsRect(childDesiredSize.descent, childDesiredSize.ascent,
|
|
childDesiredSize.width, childDesiredSize.height));
|
|
}
|
|
}
|
|
childFrame->GetNextSibling(&childFrame);
|
|
}
|
|
}
|
|
|
|
/////////////
|
|
// Place children now by re-adjusting the origins to align the baselines
|
|
FinalizeReflow(aPresContext, *aReflowState.rendContext, aDesiredSize);
|
|
|
|
aStatus = NS_FRAME_COMPLETE;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLContainerFrame::Place(nsIPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
PRBool aPlaceOrigin,
|
|
nsHTMLReflowMetrics& aDesiredSize)
|
|
{
|
|
aDesiredSize.width = aDesiredSize.height = 0;
|
|
aDesiredSize.ascent = aDesiredSize.descent = 0;
|
|
mBoundingMetrics.Clear();
|
|
|
|
PRInt32 count = 0;
|
|
nsBoundingMetrics bm;
|
|
nsHTMLReflowMetrics childSize(nsnull);
|
|
nsIFrame* childFrame = mFrames.FirstChild();
|
|
while (childFrame) {
|
|
if (!IsOnlyWhitespace(childFrame)) {
|
|
GetReflowAndBoundingMetricsFor(childFrame, childSize, bm);
|
|
|
|
aDesiredSize.width += childSize.width;
|
|
if (aDesiredSize.descent < childSize.descent)
|
|
aDesiredSize.descent = childSize.descent;
|
|
if (aDesiredSize.ascent < childSize.ascent)
|
|
aDesiredSize.ascent = childSize.ascent;
|
|
|
|
// Compute and cache our bounding metrics
|
|
if (0 == count)
|
|
mBoundingMetrics = bm;
|
|
else
|
|
mBoundingMetrics += bm;
|
|
|
|
count++;
|
|
}
|
|
childFrame->GetNextSibling(&childFrame);
|
|
}
|
|
aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
|
|
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
|
|
|
|
if (aPlaceOrigin) {
|
|
nsRect rect;
|
|
nscoord dy, dx = 0;
|
|
childFrame = mFrames.FirstChild();
|
|
while (childFrame) {
|
|
childFrame->GetRect(rect);
|
|
childSize.width = rect.width;
|
|
childSize.height = rect.height;
|
|
|
|
// Place and size the child
|
|
dy = aDesiredSize.ascent - rect.y;
|
|
FinishReflowChild(childFrame, aPresContext, childSize, dx, dy, 0);
|
|
|
|
dx += rect.width;
|
|
childFrame->GetNextSibling(&childFrame);
|
|
}
|
|
}
|
|
|
|
mReference.x = 0;
|
|
mReference.y = aDesiredSize.ascent;
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
//==========================
|
|
// *BEWARE* of the wrapper frame!
|
|
// This is the frame that is inserted to alter the style context of
|
|
// scripting elements. What this means is that looking for your parent
|
|
// or your siblings with (possible several) wrapper frames around you
|
|
// can make you wonder what is going on. For example, the direct parent
|
|
// of the subscript within <msub> is not <msub>, but instead the wrapper
|
|
// frame that was insterted to alter the style context of the subscript!
|
|
// You will seldom need to find out who is exactly your parent. You should
|
|
// first rethink your code to see if you can avoid finding who is your parent.
|
|
// Be careful, there are wrapper frames all over the place, and probably
|
|
// one or many are wrapping you if you are in a position where the
|
|
// scriptlevel is non zero.
|
|
|
|
nsresult
|
|
NS_NewMathMLWrapperFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
|
|
{
|
|
NS_PRECONDITION(aNewFrame, "null OUT ptr");
|
|
if (nsnull == aNewFrame) {
|
|
return NS_ERROR_NULL_POINTER;
|
|
}
|
|
nsMathMLWrapperFrame* it = new (aPresShell) nsMathMLWrapperFrame;
|
|
if (nsnull == it) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
*aNewFrame = it;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsMathMLWrapperFrame::nsMathMLWrapperFrame()
|
|
{
|
|
}
|
|
|
|
nsMathMLWrapperFrame::~nsMathMLWrapperFrame()
|
|
{
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLWrapperFrame::Reflow(nsIPresContext* aPresContext,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aStatus)
|
|
{
|
|
nsresult rv = NS_OK;
|
|
aStatus = NS_FRAME_COMPLETE;
|
|
aDesiredSize.width = aDesiredSize.height = aDesiredSize.ascent = aDesiredSize.descent = 0;
|
|
|
|
// See if this is an incremental reflow
|
|
if (aReflowState.reason == eReflowReason_Incremental) {
|
|
nsIFrame* targetFrame;
|
|
aReflowState.reflowCommand->GetTarget(targetFrame);
|
|
#ifdef MATHML_NOISY_INCREMENTAL_REFLOW
|
|
printf("nsMathMLWrapperFrame::Reflow:IncrementalReflow received by: ");
|
|
nsFrame::ListTag(stdout, this);
|
|
printf("for target: ");
|
|
nsFrame::ListTag(stdout, targetFrame);
|
|
printf("\n");
|
|
#endif
|
|
if (this == targetFrame) {
|
|
}
|
|
else {
|
|
// Remove the next frame from the reflow path
|
|
nsIFrame* nextFrame;
|
|
aReflowState.reflowCommand->GetNext(nextFrame);
|
|
}
|
|
}
|
|
|
|
nsIFrame* childFrame = mFrames.FirstChild();
|
|
if (childFrame) {
|
|
nsReflowStatus childStatus;
|
|
nsHTMLReflowMetrics childDesiredSize(aDesiredSize.maxElementSize,
|
|
aDesiredSize.mFlags | NS_REFLOW_CALC_BOUNDING_METRICS);
|
|
nsSize availSize(aReflowState.mComputedWidth, aReflowState.mComputedHeight);
|
|
nsHTMLReflowState childReflowState(aPresContext, aReflowState, childFrame, availSize);
|
|
rv = ReflowChild(childFrame, aPresContext, childDesiredSize, childReflowState, childStatus);
|
|
childFrame->SetRect(aPresContext,
|
|
nsRect(childDesiredSize.descent,childDesiredSize.ascent,
|
|
childDesiredSize.width,childDesiredSize.height));
|
|
aDesiredSize = childDesiredSize;
|
|
aStatus = childStatus;
|
|
|
|
mBoundingMetrics = childDesiredSize.mBoundingMetrics;
|
|
|
|
mReference.x = 0;
|
|
mReference.y = aDesiredSize.ascent;
|
|
|
|
FinalizeReflow(aPresContext, *aReflowState.rendContext, aDesiredSize);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLWrapperFrame::Place(nsIPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
PRBool aPlaceOrigin,
|
|
nsHTMLReflowMetrics& aDesiredSize)
|
|
{
|
|
aDesiredSize.width = aDesiredSize.height = 0;
|
|
aDesiredSize.ascent = aDesiredSize.descent = 0;
|
|
aDesiredSize.mBoundingMetrics.Clear();
|
|
|
|
nsIFrame* childFrame = mFrames.FirstChild();
|
|
if (childFrame) {
|
|
|
|
// get a possibly updated bounding metrics if the child is
|
|
// a stretchy MathML frame that has just been stretched, otherwise
|
|
// keep the bounding metrics that was computed in Reflow()
|
|
nsIMathMLFrame* aMathMLFrame = nsnull;
|
|
nsresult rv = childFrame->QueryInterface(NS_GET_IID(nsIMathMLFrame), (void**)&aMathMLFrame);
|
|
if (NS_SUCCEEDED(rv) && aMathMLFrame) {
|
|
aMathMLFrame->GetBoundingMetrics(mBoundingMetrics);
|
|
aMathMLFrame->GetReference(mReference); // XXX doesn't set the correct value (due to lspace) fix me!
|
|
}
|
|
|
|
nsRect rect;
|
|
childFrame->GetRect(rect);
|
|
aDesiredSize.descent = rect.x;
|
|
aDesiredSize.ascent = rect.y;
|
|
aDesiredSize.width = rect.width;
|
|
aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
|
|
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
|
|
|
|
if (aPlaceOrigin) {
|
|
nsHTMLReflowMetrics childSize(nsnull);
|
|
childSize.width = rect.width;
|
|
childSize.height = rect.height;
|
|
FinishReflowChild(childFrame, aPresContext, childSize, 0, 0, 0);
|
|
}
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
#if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
|
|
NS_IMETHODIMP
|
|
nsMathMLWrapperFrame::Paint(nsIPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
const nsRect& aDirtyRect,
|
|
nsFramePaintLayer aWhichLayer)
|
|
{
|
|
nsresult rv = NS_OK;
|
|
|
|
rv = nsHTMLContainerFrame::Paint(aPresContext,
|
|
aRenderingContext,
|
|
aDirtyRect,
|
|
aWhichLayer);
|
|
|
|
if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer)
|
|
{
|
|
aRenderingContext.SetColor(NS_RGB(255,0,0));
|
|
|
|
nscoord x = mReference.x + mBoundingMetrics.leftBearing;
|
|
nscoord y = mReference.y - mBoundingMetrics.ascent;
|
|
nscoord w = mBoundingMetrics.rightBearing - mBoundingMetrics.leftBearing;
|
|
nscoord h = mBoundingMetrics.ascent + mBoundingMetrics.descent;
|
|
|
|
aRenderingContext.DrawRect(x,y,w,h);
|
|
}
|
|
return rv;
|
|
}
|
|
#endif
|