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494 lines
19 KiB
C++
494 lines
19 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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* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
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* Shyjan Mahamud <mahamud@cs.cmu.edu>
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* Pierre Phaneuf <pp@ludusdesign.com>
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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 "nsCOMPtr.h"
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#include "nsFrame.h"
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#include "nsPresContext.h"
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#include "nsStyleContext.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 "nsMathMLmunderoverFrame.h"
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#include "nsMathMLmsubsupFrame.h"
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//
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// <munderover> -- attach an underscript-overscript pair to a base - implementation
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//
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nsIFrame*
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NS_NewMathMLmunderoverFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsMathMLmunderoverFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmunderoverFrame)
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nsMathMLmunderoverFrame::~nsMathMLmunderoverFrame()
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{
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}
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NS_IMETHODIMP
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nsMathMLmunderoverFrame::AttributeChanged(PRInt32 aNameSpaceID,
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nsIAtom* aAttribute,
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PRInt32 aModType)
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{
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if (nsGkAtoms::accent_ == aAttribute ||
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nsGkAtoms::accentunder_ == aAttribute) {
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// When we have automatic data to update within ourselves, we ask our
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// parent to re-layout its children
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return ReLayoutChildren(mParent);
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}
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return nsMathMLContainerFrame::
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AttributeChanged(aNameSpaceID, aAttribute, aModType);
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}
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NS_IMETHODIMP
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nsMathMLmunderoverFrame::UpdatePresentationData(PRUint32 aFlagsValues,
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PRUint32 aFlagsToUpdate)
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{
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nsMathMLContainerFrame::UpdatePresentationData(aFlagsValues, aFlagsToUpdate);
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// disable the stretch-all flag if we are going to act like a subscript-superscript pair
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if ( NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) &&
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!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
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mPresentationData.flags &= ~NS_MATHML_STRETCH_ALL_CHILDREN_HORIZONTALLY;
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}
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else {
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mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_HORIZONTALLY;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmunderoverFrame::UpdatePresentationDataFromChildAt(PRInt32 aFirstIndex,
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PRInt32 aLastIndex,
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PRUint32 aFlagsValues,
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PRUint32 aFlagsToUpdate)
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{
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// munderover is special... The REC says:
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// Within underscript, <munder> always sets displaystyle to "false",
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// but increments scriptlevel by 1 only when accentunder is "false".
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// Within underscript, <munderover> always sets displaystyle to "false",
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// but increments scriptlevel by 1 only when accentunder is "false".
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// This means that
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// 1. don't allow displaystyle to change in the underscript & overscript
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// 2a if the value of the accent is changed, we need to recompute the
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// scriptlevel of the underscript. The problem is that the accent
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// can change in the <mo> deep down the embellished hierarchy
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// 2b if the value of the accent is changed, we need to recompute the
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// scriptlevel of the overscript. The problem is that the accent
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// can change in the <mo> deep down the embellished hierarchy
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// Do #1 here, prevent displaystyle to be changed in the underscript & overscript
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PRInt32 index = 0;
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nsIFrame* childFrame = mFrames.FirstChild();
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while (childFrame) {
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if ((index >= aFirstIndex) &&
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((aLastIndex <= 0) || ((aLastIndex > 0) && (index <= aLastIndex)))) {
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if (index > 0) {
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// disable the flag
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aFlagsToUpdate &= ~NS_MATHML_DISPLAYSTYLE;
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aFlagsValues &= ~NS_MATHML_DISPLAYSTYLE;
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}
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PropagatePresentationDataFor(childFrame, aFlagsValues, aFlagsToUpdate);
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}
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index++;
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childFrame = childFrame->GetNextSibling();
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}
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return NS_OK;
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// For #2, changing the accent attribute will trigger a re-build of
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// all automatic data in the embellished hierarchy
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}
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NS_IMETHODIMP
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nsMathMLmunderoverFrame::InheritAutomaticData(nsIFrame* aParent)
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{
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// let the base class get the default from our parent
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nsMathMLContainerFrame::InheritAutomaticData(aParent);
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mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_HORIZONTALLY;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmunderoverFrame::TransmitAutomaticData()
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{
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// At this stage, all our children are in sync and we can fully
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// resolve our own mEmbellishData struct
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//---------------------------------------------------------------------
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/*
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The REC says:
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The accent and accentunder attributes have the same effect as
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the attributes with the same names on <mover> and <munder>,
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respectively. Their default values are also computed in the
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same manner as described for those elements, with the default
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value of accent depending on overscript and the default value
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of accentunder depending on underscript.
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*/
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nsIFrame* overscriptFrame = nsnull;
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nsIFrame* underscriptFrame = nsnull;
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nsIFrame* baseFrame = mFrames.FirstChild();
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if (baseFrame)
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underscriptFrame = baseFrame->GetNextSibling();
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if (underscriptFrame)
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overscriptFrame = underscriptFrame->GetNextSibling();
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// if our base is an embellished operator, let its state bubble to us (in particular,
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// this is where we get the flag for NS_MATHML_EMBELLISH_MOVABLELIMITS). Our flags
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// are reset to the default values of false if the base frame isn't embellished.
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mPresentationData.baseFrame = baseFrame;
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GetEmbellishDataFrom(baseFrame, mEmbellishData);
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// The default value of accentunder is false, unless the underscript is embellished
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// and its core <mo> is an accent
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nsEmbellishData embellishData;
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GetEmbellishDataFrom(underscriptFrame, embellishData);
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if (NS_MATHML_EMBELLISH_IS_ACCENT(embellishData.flags))
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mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTUNDER;
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else
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mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTUNDER;
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static nsIContent::AttrValuesArray strings[] =
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{&nsGkAtoms::_true, &nsGkAtoms::_false, nsnull};
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// if we have an accentunder attribute, it overrides what the underscript said
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switch (mContent->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::accentunder_,
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strings, eCaseMatters)) {
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case 0: mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTUNDER; break;
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case 1: mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTUNDER; break;
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}
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// The default value of accent is false, unless the overscript is embellished
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// and its core <mo> is an accent
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GetEmbellishDataFrom(overscriptFrame, embellishData);
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if (NS_MATHML_EMBELLISH_IS_ACCENT(embellishData.flags))
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mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTOVER;
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else
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mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTOVER;
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// if we have an accent attribute, it overrides what the overscript said
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switch (mContent->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::accent_,
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strings, eCaseMatters)) {
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case 0: mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTOVER; break;
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case 1: mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTOVER; break;
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}
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// disable the stretch-all flag if we are going to act like a superscript
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if ( NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) &&
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!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags))
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mPresentationData.flags &= ~NS_MATHML_STRETCH_ALL_CHILDREN_HORIZONTALLY;
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// Now transmit any change that we want to our children so that they
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// can update their mPresentationData structs
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//---------------------------------------------------------------------
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/* The REC says:
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Within underscript, <munderover> always sets displaystyle to "false",
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but increments scriptlevel by 1 only when accentunder is "false".
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Within overscript, <munderover> always sets displaystyle to "false",
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but increments scriptlevel by 1 only when accent is "false".
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The TeXBook treats 'over' like a superscript, so p.141 or Rule 13a
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say it shouldn't be compressed. However, The TeXBook says
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that math accents and \overline change uncramped styles to their
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cramped counterparts.
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*/
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PRUint32 compress = NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags)
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? NS_MATHML_COMPRESSED : 0;
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SetIncrementScriptLevel(2, !NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags));
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PropagatePresentationDataFor(overscriptFrame,
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~NS_MATHML_DISPLAYSTYLE | compress,
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NS_MATHML_DISPLAYSTYLE | compress);
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/*
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The TeXBook treats 'under' like a subscript, so p.141 or Rule 13a
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say it should be compressed
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*/
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SetIncrementScriptLevel(1, !NS_MATHML_EMBELLISH_IS_ACCENTUNDER(mEmbellishData.flags));
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PropagatePresentationDataFor(underscriptFrame,
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~NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED,
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NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED);
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return NS_OK;
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}
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/*
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The REC says:
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* If the base is an operator with movablelimits="true" (or an embellished
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operator whose <mo> element core has movablelimits="true"), and
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displaystyle="false", then underscript and overscript are drawn in
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a subscript and superscript position, respectively. In this case,
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the accent and accentunder attributes are ignored. This is often
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used for limits on symbols such as ∑.
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i.e.,:
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if ( NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishDataflags) &&
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!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
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// place like subscript-superscript pair
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}
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else {
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// place like underscript-overscript pair
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}
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*/
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/* virtual */ nsresult
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nsMathMLmunderoverFrame::Place(nsIRenderingContext& aRenderingContext,
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PRBool aPlaceOrigin,
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nsHTMLReflowMetrics& aDesiredSize)
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{
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if ( NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) &&
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!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
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// place like sub-superscript pair
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return nsMathMLmsubsupFrame::PlaceSubSupScript(PresContext(),
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aRenderingContext,
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aPlaceOrigin,
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aDesiredSize,
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this, 0, 0, PresContext()->PointsToAppUnits(0.5f));
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}
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////////////////////////////////////
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// Get the children's desired sizes
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nsBoundingMetrics bmBase, bmUnder, bmOver;
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nsHTMLReflowMetrics baseSize;
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nsHTMLReflowMetrics underSize;
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nsHTMLReflowMetrics overSize;
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nsIFrame* overFrame = nsnull;
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nsIFrame* underFrame = nsnull;
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nsIFrame* baseFrame = mFrames.FirstChild();
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if (baseFrame)
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underFrame = baseFrame->GetNextSibling();
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if (underFrame)
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overFrame = underFrame->GetNextSibling();
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if (!baseFrame || !underFrame || !overFrame || overFrame->GetNextSibling()) {
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// report an error, encourage people to get their markups in order
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return ReflowError(aRenderingContext, aDesiredSize);
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}
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GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase);
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GetReflowAndBoundingMetricsFor(underFrame, underSize, bmUnder);
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GetReflowAndBoundingMetricsFor(overFrame, overSize, bmOver);
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nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
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////////////////////
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// Place Children
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aRenderingContext.SetFont(GetStyleFont()->mFont, nsnull,
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PresContext()->GetUserFontSet());
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nsCOMPtr<nsIFontMetrics> fm;
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aRenderingContext.GetFontMetrics(*getter_AddRefs(fm));
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nscoord xHeight = 0;
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fm->GetXHeight (xHeight);
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nscoord ruleThickness;
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GetRuleThickness (aRenderingContext, fm, ruleThickness);
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nscoord correction = 0;
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GetItalicCorrection (bmBase, correction);
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// there are 2 different types of placement depending on
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// whether we want an accented under or not
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nscoord underDelta1 = 0; // gap between base and underscript
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nscoord underDelta2 = 0; // extra space beneath underscript
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if (!NS_MATHML_EMBELLISH_IS_ACCENTUNDER(mEmbellishData.flags)) {
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// Rule 13a, App. G, TeXbook
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nscoord bigOpSpacing2, bigOpSpacing4, bigOpSpacing5, dummy;
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GetBigOpSpacings (fm,
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dummy, bigOpSpacing2,
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dummy, bigOpSpacing4,
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bigOpSpacing5);
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underDelta1 = NS_MAX(bigOpSpacing2, (bigOpSpacing4 - bmUnder.ascent));
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underDelta2 = bigOpSpacing5;
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}
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else {
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// No corresponding rule in TeXbook - we are on our own here
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// XXX tune the gap delta between base and underscript
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// Should we use Rule 10 like \underline does?
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underDelta1 = ruleThickness + onePixel/2;
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underDelta2 = ruleThickness;
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}
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// empty under?
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if (!(bmUnder.ascent + bmUnder.descent)) underDelta1 = 0;
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nscoord overDelta1 = 0; // gap between base and overscript
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nscoord overDelta2 = 0; // extra space above overscript
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if (!NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags)) {
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// Rule 13a, App. G, TeXbook
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nscoord bigOpSpacing1, bigOpSpacing3, bigOpSpacing5, dummy;
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GetBigOpSpacings (fm,
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bigOpSpacing1, dummy,
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bigOpSpacing3, dummy,
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bigOpSpacing5);
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overDelta1 = NS_MAX(bigOpSpacing1, (bigOpSpacing3 - bmOver.descent));
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overDelta2 = bigOpSpacing5;
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// XXX This is not a TeX rule...
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// delta1 (as computed abvove) can become really big when bmOver.descent is
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// negative, e.g., if the content is &OverBar. In such case, we use the height
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if (bmOver.descent < 0)
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overDelta1 = NS_MAX(bigOpSpacing1, (bigOpSpacing3 - (bmOver.ascent + bmOver.descent)));
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}
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else {
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// Rule 12, App. G, TeXbook
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overDelta1 = ruleThickness + onePixel/2;
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if (bmBase.ascent < xHeight) {
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overDelta1 += xHeight - bmBase.ascent;
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}
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overDelta2 = ruleThickness;
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}
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// empty over?
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if (!(bmOver.ascent + bmOver.descent)) overDelta1 = 0;
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nscoord dxBase, dxOver = 0, dxUnder = 0;
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//////////
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// pass 1, do what <mover> does: attach the overscript on the base
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// Ad-hoc - This is to override fonts which have ready-made _accent_
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// glyphs with negative lbearing and rbearing. We want to position
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// the overscript ourselves
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nscoord overWidth = bmOver.width;
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if (!overWidth && (bmOver.rightBearing - bmOver.leftBearing > 0)) {
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overWidth = bmOver.rightBearing - bmOver.leftBearing;
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dxOver = -bmOver.leftBearing;
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}
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if (NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags)) {
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mBoundingMetrics.width = bmBase.width;
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dxOver += correction + (mBoundingMetrics.width - overWidth)/2;
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}
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else {
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mBoundingMetrics.width = NS_MAX(bmBase.width, overWidth);
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dxOver += correction/2 + (mBoundingMetrics.width - overWidth)/2;
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}
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dxBase = (mBoundingMetrics.width - bmBase.width)/2;
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mBoundingMetrics.ascent =
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bmBase.ascent + overDelta1 + bmOver.ascent + bmOver.descent;
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mBoundingMetrics.descent =
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bmBase.descent + underDelta1 + bmUnder.ascent + bmUnder.descent;
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mBoundingMetrics.leftBearing =
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NS_MIN(dxBase + bmBase.leftBearing, dxOver + bmOver.leftBearing);
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mBoundingMetrics.rightBearing =
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NS_MAX(dxBase + bmBase.rightBearing, dxOver + bmOver.rightBearing);
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//////////
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// pass 2, do what <munder> does: attach the underscript on the previous
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// result. We conceptually view the previous result as an "anynomous base"
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// from where to attach the underscript. Hence if the underscript is empty,
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// we should end up like <mover>. If the overscript is empty, we should
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// end up like <munder>.
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nsBoundingMetrics bmAnonymousBase = mBoundingMetrics;
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nscoord ascentAnonymousBase =
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NS_MAX(mBoundingMetrics.ascent + overDelta2,
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overSize.ascent + bmOver.descent + overDelta1 + bmBase.ascent);
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GetItalicCorrection(bmAnonymousBase, correction);
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// Width of non-spacing marks is zero so use left and right bearing.
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nscoord underWidth = bmUnder.width;
|
|
if (!underWidth) {
|
|
underWidth = bmUnder.rightBearing - bmUnder.leftBearing;
|
|
dxUnder = -bmUnder.leftBearing;
|
|
}
|
|
|
|
nscoord maxWidth = NS_MAX(bmAnonymousBase.width, underWidth);
|
|
if (NS_MATHML_EMBELLISH_IS_ACCENTUNDER(mEmbellishData.flags)) {
|
|
dxUnder += (maxWidth - underWidth)/2;;
|
|
}
|
|
else {
|
|
dxUnder += -correction/2 + (maxWidth - underWidth)/2;
|
|
}
|
|
nscoord dxAnonymousBase = (maxWidth - bmAnonymousBase.width)/2;
|
|
|
|
// adjust the offsets of the real base and overscript since their
|
|
// final offsets should be relative to us...
|
|
dxOver += dxAnonymousBase;
|
|
dxBase += dxAnonymousBase;
|
|
|
|
mBoundingMetrics.width =
|
|
NS_MAX(dxAnonymousBase + bmAnonymousBase.width, dxUnder + bmUnder.width);
|
|
mBoundingMetrics.leftBearing =
|
|
NS_MIN(dxAnonymousBase + bmAnonymousBase.leftBearing, dxUnder + bmUnder.leftBearing);
|
|
mBoundingMetrics.rightBearing =
|
|
NS_MAX(dxAnonymousBase + bmAnonymousBase.rightBearing, dxUnder + bmUnder.rightBearing);
|
|
|
|
aDesiredSize.ascent = ascentAnonymousBase;
|
|
aDesiredSize.height = aDesiredSize.ascent +
|
|
NS_MAX(mBoundingMetrics.descent + underDelta2,
|
|
bmAnonymousBase.descent + underDelta1 + bmUnder.ascent +
|
|
underSize.height - underSize.ascent);
|
|
aDesiredSize.width = mBoundingMetrics.width;
|
|
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
|
|
|
|
mReference.x = 0;
|
|
mReference.y = aDesiredSize.ascent;
|
|
|
|
if (aPlaceOrigin) {
|
|
nscoord dy;
|
|
// place overscript
|
|
dy = aDesiredSize.ascent - mBoundingMetrics.ascent + bmOver.ascent - overSize.ascent;
|
|
FinishReflowChild (overFrame, PresContext(), nsnull, overSize, dxOver, dy, 0);
|
|
// place base
|
|
dy = aDesiredSize.ascent - baseSize.ascent;
|
|
FinishReflowChild (baseFrame, PresContext(), nsnull, baseSize, dxBase, dy, 0);
|
|
// place underscript
|
|
dy = aDesiredSize.ascent + mBoundingMetrics.descent - bmUnder.descent - underSize.ascent;
|
|
FinishReflowChild (underFrame, PresContext(), nsnull, underSize, dxUnder, dy, 0);
|
|
}
|
|
return NS_OK;
|
|
}
|