зеркало из https://github.com/mozilla/pjs.git
538 строки
18 KiB
C++
538 строки
18 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* The University Of Queensland.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. 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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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsINameSpaceManager.h"
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#include "nsMathMLFrame.h"
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#include "nsMathMLChar.h"
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#include "nsCSSPseudoElements.h"
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// used to map attributes into CSS rules
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#include "nsIDocument.h"
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#include "nsStyleSet.h"
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#include "nsIStyleSheet.h"
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#include "nsIDOMCSSStyleSheet.h"
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#include "nsICSSRule.h"
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#include "nsICSSStyleRule.h"
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#include "nsStyleChangeList.h"
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#include "nsFrameManager.h"
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#include "nsNetUtil.h"
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#include "nsIURI.h"
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#include "nsContentCID.h"
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#include "nsAutoPtr.h"
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#include "nsStyleSet.h"
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#include "nsStyleUtil.h"
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#include "nsDisplayList.h"
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#include "nsAttrName.h"
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eMathMLFrameType
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nsMathMLFrame::GetMathMLFrameType()
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{
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// see if it is an embellished operator (mapped to 'Op' in TeX)
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if (mEmbellishData.coreFrame)
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return GetMathMLFrameTypeFor(mEmbellishData.coreFrame);
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// if it has a prescribed base, fetch the type from there
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if (mPresentationData.baseFrame)
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return GetMathMLFrameTypeFor(mPresentationData.baseFrame);
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// everything else is treated as ordinary (mapped to 'Ord' in TeX)
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return eMathMLFrameType_Ordinary;
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}
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// snippet of code used by <mstyle> and <mtable>, which are the only
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// two tags where the displaystyle attribute is allowed by the spec.
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/* static */ void
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nsMathMLFrame::FindAttrDisplaystyle(nsIContent* aContent,
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nsPresentationData& aPresentationData)
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{
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NS_ASSERTION(aContent->Tag() == nsGkAtoms::mstyle_ ||
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aContent->Tag() == nsGkAtoms::mtable_, "bad caller");
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static nsIContent::AttrValuesArray strings[] =
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{&nsGkAtoms::_false, &nsGkAtoms::_true, nsnull};
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// see if the explicit displaystyle attribute is there
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switch (aContent->FindAttrValueIn(kNameSpaceID_None,
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nsGkAtoms::displaystyle_, strings, eCaseMatters)) {
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case 0:
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aPresentationData.flags &= ~NS_MATHML_DISPLAYSTYLE;
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aPresentationData.flags |= NS_MATHML_EXPLICIT_DISPLAYSTYLE;
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break;
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case 1:
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aPresentationData.flags |= NS_MATHML_DISPLAYSTYLE;
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aPresentationData.flags |= NS_MATHML_EXPLICIT_DISPLAYSTYLE;
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break;
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}
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// no reset if the attr isn't found. so be sure to call it on inherited flags
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}
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NS_IMETHODIMP
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nsMathMLFrame::InheritAutomaticData(nsIFrame* aParent)
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{
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mEmbellishData.flags = 0;
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mEmbellishData.coreFrame = nsnull;
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mEmbellishData.direction = NS_STRETCH_DIRECTION_UNSUPPORTED;
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mEmbellishData.leftSpace = 0;
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mEmbellishData.rightSpace = 0;
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mPresentationData.flags = 0;
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mPresentationData.baseFrame = nsnull;
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mPresentationData.mstyle = nsnull;
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// by default, just inherit the display of our parent
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nsPresentationData parentData;
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GetPresentationDataFrom(aParent, parentData);
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mPresentationData.mstyle = parentData.mstyle;
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if (NS_MATHML_IS_DISPLAYSTYLE(parentData.flags)) {
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mPresentationData.flags |= NS_MATHML_DISPLAYSTYLE;
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}
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#if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
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mPresentationData.flags |= NS_MATHML_SHOW_BOUNDING_METRICS;
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#endif
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLFrame::UpdatePresentationData(PRUint32 aFlagsValues,
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PRUint32 aWhichFlags)
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{
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// update flags that are relevant to this call
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if (NS_MATHML_IS_DISPLAYSTYLE(aWhichFlags)) {
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// updating the displaystyle flag is allowed
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if (NS_MATHML_IS_DISPLAYSTYLE(aFlagsValues)) {
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mPresentationData.flags |= NS_MATHML_DISPLAYSTYLE;
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}
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else {
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mPresentationData.flags &= ~NS_MATHML_DISPLAYSTYLE;
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}
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}
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if (NS_MATHML_IS_COMPRESSED(aWhichFlags)) {
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// updating the compression flag is allowed
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if (NS_MATHML_IS_COMPRESSED(aFlagsValues)) {
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// 'compressed' means 'prime' style in App. G, TeXbook
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mPresentationData.flags |= NS_MATHML_COMPRESSED;
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}
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// no else. the flag is sticky. it retains its value once it is set
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}
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return NS_OK;
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}
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// Helper to give a style context suitable for doing the stretching of
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// a MathMLChar. Frame classes that use this should ensure that the
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// extra leaf style contexts given to the MathMLChars are accessible to
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// the Style System via the Get/Set AdditionalStyleContext() APIs.
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/* static */ void
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nsMathMLFrame::ResolveMathMLCharStyle(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsStyleContext* aParentStyleContext,
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nsMathMLChar* aMathMLChar,
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PRBool aIsMutableChar)
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{
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nsCSSPseudoElements::Type pseudoType = (aIsMutableChar) ?
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nsCSSPseudoElements::ePseudo_mozMathStretchy :
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nsCSSPseudoElements::ePseudo_mozMathAnonymous; // savings
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nsRefPtr<nsStyleContext> newStyleContext;
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newStyleContext = aPresContext->StyleSet()->
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ResolvePseudoElementStyle(aContent->AsElement(), pseudoType,
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aParentStyleContext);
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if (newStyleContext)
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aMathMLChar->SetStyleContext(newStyleContext);
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}
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/* static */ void
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nsMathMLFrame::GetEmbellishDataFrom(nsIFrame* aFrame,
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nsEmbellishData& aEmbellishData)
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{
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// initialize OUT params
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aEmbellishData.flags = 0;
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aEmbellishData.coreFrame = nsnull;
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aEmbellishData.direction = NS_STRETCH_DIRECTION_UNSUPPORTED;
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aEmbellishData.leftSpace = 0;
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aEmbellishData.rightSpace = 0;
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if (aFrame && aFrame->IsFrameOfType(nsIFrame::eMathML)) {
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nsIMathMLFrame* mathMLFrame = do_QueryFrame(aFrame);
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if (mathMLFrame) {
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mathMLFrame->GetEmbellishData(aEmbellishData);
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}
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}
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}
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// helper to get the presentation data of a frame, by possibly walking up
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// the frame hierarchy if we happen to be surrounded by non-MathML frames.
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/* static */ void
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nsMathMLFrame::GetPresentationDataFrom(nsIFrame* aFrame,
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nsPresentationData& aPresentationData,
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PRBool aClimbTree)
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{
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// initialize OUT params
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aPresentationData.flags = 0;
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aPresentationData.baseFrame = nsnull;
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aPresentationData.mstyle = nsnull;
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nsIFrame* frame = aFrame;
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while (frame) {
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if (frame->IsFrameOfType(nsIFrame::eMathML)) {
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nsIMathMLFrame* mathMLFrame = do_QueryFrame(frame);
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if (mathMLFrame) {
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mathMLFrame->GetPresentationData(aPresentationData);
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break;
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}
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}
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// stop if the caller doesn't want to lookup beyond the frame
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if (!aClimbTree) {
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break;
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}
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// stop if we reach the root <math> tag
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nsIContent* content = frame->GetContent();
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NS_ASSERTION(content || !frame->GetParent(), // no assert for the root
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"dangling frame without a content node");
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if (!content)
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break;
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if (content->Tag() == nsGkAtoms::math) {
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const nsStyleDisplay* display = frame->GetStyleDisplay();
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if (display->mDisplay == NS_STYLE_DISPLAY_BLOCK) {
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aPresentationData.flags |= NS_MATHML_DISPLAYSTYLE;
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}
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break;
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}
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frame = frame->GetParent();
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}
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NS_WARN_IF_FALSE(frame && frame->GetContent(),
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"bad MathML markup - could not find the top <math> element");
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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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/* static */ PRBool
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nsMathMLFrame::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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// see if we can get the attribute from the content
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if (aContent && aContent->GetAttr(kNameSpaceID_None, aAttributeAtom,
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aValue)) {
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return PR_TRUE;
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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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return PR_FALSE;
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}
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nsIFrame* mstyleParent = aMathMLmstyleFrame->GetParent();
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nsPresentationData mstyleParentData;
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mstyleParentData.mstyle = nsnull;
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if (mstyleParent) {
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nsIMathMLFrame* mathMLFrame = do_QueryFrame(mstyleParent);
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if (mathMLFrame) {
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mathMLFrame->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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return GetAttribute(aMathMLmstyleFrame->GetContent(),
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mstyleParentData.mstyle, aAttributeAtom, aValue);
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}
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/* static */ void
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nsMathMLFrame::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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#ifdef NS_DEBUG
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nsCOMPtr<nsIFontMetrics> currFontMetrics;
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aRenderingContext.GetFontMetrics(*getter_AddRefs(currFontMetrics));
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NS_ASSERTION(currFontMetrics->Font().Equals(aFontMetrics->Font()),
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"unexpected state");
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#endif
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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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/* static */ void
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nsMathMLFrame::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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#ifdef NS_DEBUG
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nsCOMPtr<nsIFontMetrics> currFontMetrics;
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aRenderingContext.GetFontMetrics(*getter_AddRefs(currFontMetrics));
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NS_ASSERTION(currFontMetrics->Font().Equals(aFontMetrics->Font()),
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"unexpected state");
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#endif
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nscoord xHeight;
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aFontMetrics->GetXHeight(xHeight);
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PRUnichar minus = 0x2212; // not '-', but official Unicode minus sign
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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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}
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/* static */ nscoord
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nsMathMLFrame::CalcLength(nsPresContext* aPresContext,
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nsStyleContext* 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.GetFixedLength(aPresContext);
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}
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if (aCSSValue.IsPixelLengthUnit()) {
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return aCSSValue.GetPixelLength();
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}
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nsCSSUnit unit = aCSSValue.GetUnit();
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if (eCSSUnit_EM == unit) {
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const nsStyleFont* font = aStyleContext->GetStyleFont();
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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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const nsStyleFont* font = aStyleContext->GetStyleFont();
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nsCOMPtr<nsIFontMetrics> fm = aPresContext->GetMetricsFor(font->mFont);
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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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// MathML doesn't specify other CSS units such as rem or ch
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NS_ERROR("Unsupported unit");
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return 0;
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}
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/* static */ PRBool
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nsMathMLFrame::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 = nsnull;
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if (aString.EqualsLiteral("veryverythinmathspace")) {
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i = 1;
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namedspaceAtom = nsGkAtoms::veryverythinmathspace_;
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}
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else if (aString.EqualsLiteral("verythinmathspace")) {
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i = 2;
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namedspaceAtom = nsGkAtoms::verythinmathspace_;
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}
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else if (aString.EqualsLiteral("thinmathspace")) {
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i = 3;
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namedspaceAtom = nsGkAtoms::thinmathspace_;
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}
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else if (aString.EqualsLiteral("mediummathspace")) {
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i = 4;
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namedspaceAtom = nsGkAtoms::mediummathspace_;
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}
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else if (aString.EqualsLiteral("thickmathspace")) {
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i = 5;
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namedspaceAtom = nsGkAtoms::thickmathspace_;
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}
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else if (aString.EqualsLiteral("verythickmathspace")) {
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i = 6;
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namedspaceAtom = nsGkAtoms::verythickmathspace_;
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}
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else if (aString.EqualsLiteral("veryverythickmathspace")) {
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i = 7;
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namedspaceAtom = nsGkAtoms::veryverythickmathspace_;
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}
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if (0 != i) {
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if (aMathMLmstyleFrame) {
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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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GetAttribute(nsnull, aMathMLmstyleFrame, namedspaceAtom, value);
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if (!value.IsEmpty()) {
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if (ParseNumericValue(value, aCSSValue) &&
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aCSSValue.IsLengthUnit()) {
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return PR_TRUE;
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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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// ================
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// Utils to map attributes into CSS rules (work-around to bug 69409 which
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// is not scheduled to be fixed anytime soon)
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//
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static const PRInt32 kMathMLversion1 = 1;
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static const PRInt32 kMathMLversion2 = 2;
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struct
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nsCSSMapping {
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PRInt32 compatibility;
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const nsIAtom* attrAtom;
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const char* cssProperty;
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};
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#if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
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class nsDisplayMathMLBoundingMetrics : public nsDisplayItem {
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public:
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nsDisplayMathMLBoundingMetrics(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame, const nsRect& aRect)
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: nsDisplayItem(aBuilder, aFrame), mRect(aRect) {
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MOZ_COUNT_CTOR(nsDisplayMathMLBoundingMetrics);
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}
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#ifdef NS_BUILD_REFCNT_LOGGING
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virtual ~nsDisplayMathMLBoundingMetrics() {
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MOZ_COUNT_DTOR(nsDisplayMathMLBoundingMetrics);
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}
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#endif
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virtual void Paint(nsDisplayListBuilder* aBuilder,
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nsIRenderingContext* aCtx);
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NS_DISPLAY_DECL_NAME("MathMLBoundingMetrics", TYPE_MATHML_BOUNDING_METRICS)
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private:
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nsRect mRect;
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};
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void nsDisplayMathMLBoundingMetrics::Paint(nsDisplayListBuilder* aBuilder,
|
|
nsIRenderingContext* aCtx)
|
|
{
|
|
aCtx->SetColor(NS_RGB(0,0,255));
|
|
aCtx->DrawRect(mRect + ToReferenceFrame());
|
|
}
|
|
|
|
nsresult
|
|
nsMathMLFrame::DisplayBoundingMetrics(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame, const nsPoint& aPt,
|
|
const nsBoundingMetrics& aMetrics,
|
|
const nsDisplayListSet& aLists) {
|
|
if (!NS_MATHML_PAINT_BOUNDING_METRICS(mPresentationData.flags))
|
|
return NS_OK;
|
|
|
|
nscoord x = aPt.x + aMetrics.leftBearing;
|
|
nscoord y = aPt.y - aMetrics.ascent;
|
|
nscoord w = aMetrics.rightBearing - aMetrics.leftBearing;
|
|
nscoord h = aMetrics.ascent + aMetrics.descent;
|
|
|
|
return aLists.Content()->AppendNewToTop(new (aBuilder)
|
|
nsDisplayMathMLBoundingMetrics(aBuilder, this, nsRect(x,y,w,h)));
|
|
}
|
|
#endif
|
|
|
|
class nsDisplayMathMLBar : public nsDisplayItem {
|
|
public:
|
|
nsDisplayMathMLBar(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame, const nsRect& aRect)
|
|
: nsDisplayItem(aBuilder, aFrame), mRect(aRect) {
|
|
MOZ_COUNT_CTOR(nsDisplayMathMLBar);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayMathMLBar() {
|
|
MOZ_COUNT_DTOR(nsDisplayMathMLBar);
|
|
}
|
|
#endif
|
|
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder,
|
|
nsIRenderingContext* aCtx);
|
|
NS_DISPLAY_DECL_NAME("MathMLBar", TYPE_MATHML_BAR)
|
|
private:
|
|
nsRect mRect;
|
|
};
|
|
|
|
void nsDisplayMathMLBar::Paint(nsDisplayListBuilder* aBuilder,
|
|
nsIRenderingContext* aCtx)
|
|
{
|
|
// paint the bar with the current text color
|
|
aCtx->SetColor(mFrame->GetStyleColor()->mColor);
|
|
aCtx->FillRect(mRect + ToReferenceFrame());
|
|
}
|
|
|
|
nsresult
|
|
nsMathMLFrame::DisplayBar(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame, const nsRect& aRect,
|
|
const nsDisplayListSet& aLists) {
|
|
if (!aFrame->GetStyleVisibility()->IsVisible() || aRect.IsEmpty())
|
|
return NS_OK;
|
|
|
|
return aLists.Content()->AppendNewToTop(new (aBuilder)
|
|
nsDisplayMathMLBar(aBuilder, aFrame, aRect));
|
|
}
|