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Bug 668204 - Merge nsMathMLmunderFrame and nsMathMLmoverFrame into nsMathMLmunderoverFrame. r=karlt

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This commit is contained in:
Jonathan Hage 2011-08-13 17:22:12 +02:00
parent c8586cbbf2
commit c9d5ac8edc
8 changed files with 189 additions and 1023 deletions
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4
layout/base/nsCSSFrameConstructor.cpp
View File

@ -4646,8 +4646,8 @@ nsCSSFrameConstructor::FindMathMLData(Element* aElement,
SIMPLE_MATHML_CREATE(msup_, NS_NewMathMLmsupFrame),
SIMPLE_MATHML_CREATE(msub_, NS_NewMathMLmsubFrame),
SIMPLE_MATHML_CREATE(msubsup_, NS_NewMathMLmsubsupFrame),
SIMPLE_MATHML_CREATE(munder_, NS_NewMathMLmunderFrame),
SIMPLE_MATHML_CREATE(mover_, NS_NewMathMLmoverFrame),
SIMPLE_MATHML_CREATE(munder_, NS_NewMathMLmunderoverFrame),
SIMPLE_MATHML_CREATE(mover_, NS_NewMathMLmunderoverFrame),
SIMPLE_MATHML_CREATE(munderover_, NS_NewMathMLmunderoverFrame),
SIMPLE_MATHML_CREATE(mphantom_, NS_NewMathMLmphantomFrame),
SIMPLE_MATHML_CREATE(mpadded_, NS_NewMathMLmpaddedFrame),

2
layout/mathml/Makefile.in
View File

@ -76,8 +76,6 @@ CPPSRCS = nsMathMLChar.cpp \
nsMathMLmsubsupFrame.cpp \
nsMathMLmmultiscriptsFrame.cpp \
nsMathMLmtableFrame.cpp \
nsMathMLmunderFrame.cpp \
nsMathMLmoverFrame.cpp \
nsMathMLmunderoverFrame.cpp \
nsMathMLmpaddedFrame.cpp \
nsMathMLmspaceFrame.cpp \

2
layout/mathml/nsMathMLParts.h
View File

@ -56,8 +56,6 @@ nsIFrame* NS_NewMathMLmfracFrame(nsIPresShell* aPresShell, nsStyleContext* aCont
nsIFrame* NS_NewMathMLmsubFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame* NS_NewMathMLmsupFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame* NS_NewMathMLmsubsupFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame* NS_NewMathMLmunderFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame* NS_NewMathMLmoverFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame* NS_NewMathMLmunderoverFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame* NS_NewMathMLmmultiscriptsFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame* NS_NewMathMLmstyleFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);

409
layout/mathml/nsMathMLmoverFrame.cpp
View File

@ -1,409 +0,0 @@
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla MathML Project.
*
* The Initial Developer of the Original Code is
* The University Of Queensland.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Roger B. Sidje <rbs@maths.uq.edu.au>
* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
* Shyjan Mahamud <mahamud@cs.cmu.edu>
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsCOMPtr.h"
#include "nsFrame.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsINameSpaceManager.h"
#include "nsRenderingContext.h"
#include "nsMathMLmoverFrame.h"
#include "nsMathMLmsupFrame.h"
//
// <mover> -- attach an overscript to a base - implementation
//
nsIFrame*
NS_NewMathMLmoverFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsMathMLmoverFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmoverFrame)
nsMathMLmoverFrame::~nsMathMLmoverFrame()
{
}
NS_IMETHODIMP
nsMathMLmoverFrame::AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType)
{
if (nsGkAtoms::accent_ == aAttribute) {
// When we have automatic data to update within ourselves, we ask our
// parent to re-layout its children
return ReLayoutChildren(mParent);
}
return nsMathMLContainerFrame::
AttributeChanged(aNameSpaceID, aAttribute, aModType);
}
NS_IMETHODIMP
nsMathMLmoverFrame::UpdatePresentationData(PRUint32 aFlagsValues,
PRUint32 aFlagsToUpdate)
{
nsMathMLContainerFrame::UpdatePresentationData(aFlagsValues, aFlagsToUpdate);
// disable the stretch-all flag if we are going to act like a superscript
if ( NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
mPresentationData.flags &= ~NS_MATHML_STRETCH_ALL_CHILDREN_HORIZONTALLY;
}
else {
mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_HORIZONTALLY;
}
return NS_OK;
}
NS_IMETHODIMP
nsMathMLmoverFrame::UpdatePresentationDataFromChildAt(PRInt32 aFirstIndex,
PRInt32 aLastIndex,
PRUint32 aFlagsValues,
PRUint32 aFlagsToUpdate)
{
// mover is special... The REC says:
// Within overscript, <mover> always sets displaystyle to "false",
// but increments scriptlevel by 1 only when accent is "false".
// This means that
// 1. don't allow displaystyle to change in the overscript
// 2. if the value of the accent is changed, we need to recompute the
// scriptlevel of the overscript. The problem is that the accent
// can change in the <mo> deep down the embellished hierarchy
// Do #1 here, never allow displaystyle to be changed in the overscript
PRInt32 index = 0;
nsIFrame* childFrame = mFrames.FirstChild();
while (childFrame) {
if ((index >= aFirstIndex) &&
((aLastIndex <= 0) || ((aLastIndex > 0) && (index <= aLastIndex)))) {
if (index > 0) {
// disable the flag
aFlagsToUpdate &= ~NS_MATHML_DISPLAYSTYLE;
aFlagsValues &= ~NS_MATHML_DISPLAYSTYLE;
}
PropagatePresentationDataFor(childFrame, aFlagsValues, aFlagsToUpdate);
}
index++;
childFrame = childFrame->GetNextSibling();
}
return NS_OK;
// For #2, changing the accent attribute will trigger a re-build of
// all automatic data in the embellished hierarchy
}
NS_IMETHODIMP
nsMathMLmoverFrame::InheritAutomaticData(nsIFrame* aParent)
{
// let the base class get the default from our parent
nsMathMLContainerFrame::InheritAutomaticData(aParent);
mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_HORIZONTALLY;
return NS_OK;
}
NS_IMETHODIMP
nsMathMLmoverFrame::TransmitAutomaticData()
{
// At this stage, all our children are in sync and we can fully
// resolve our own mEmbellishData struct
//---------------------------------------------------------------------
/* The REC says:
The default value of accent is false, unless overscript
is an <mo> element or an embellished operator. If overscript is
an <mo> element, the value of its accent attribute is used as
the default value of accent. If overscript is an embellished
operator, the accent attribute of the <mo> element at its
core is used as the default value. As with all attributes, an
explicitly given value overrides the default.
XXX The winner is the outermost in conflicting settings like these:
<mover accent='true'>
<mi>...</mi>
<mo accent='false'> ... </mo>
</mover>
*/
nsIFrame* overscriptFrame = nsnull;
nsIFrame* baseFrame = mFrames.FirstChild();
if (baseFrame)
overscriptFrame = baseFrame->GetNextSibling();
// if our base is an embellished operator, let its state bubble to us (in particular,
// this is where we get the flag for NS_MATHML_EMBELLISH_MOVABLELIMITS). Our flags
// are reset to the default values of false if the base frame isn't embellished.
mPresentationData.baseFrame = baseFrame;
GetEmbellishDataFrom(baseFrame, mEmbellishData);
// The default value of accent is false, unless the overscript is embellished
// and its core <mo> is an accent
nsEmbellishData embellishData;
GetEmbellishDataFrom(overscriptFrame, embellishData);
if (NS_MATHML_EMBELLISH_IS_ACCENT(embellishData.flags))
mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTOVER;
else
mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTOVER;
// if we have an accent attribute, it overrides what the overscript said
nsAutoString value;
if (GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::accent_,
value)) {
if (value.EqualsLiteral("true")) {
mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTOVER;
} else if (value.EqualsLiteral("false")) {
mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTOVER;
}
}
// disable the stretch-all flag if we are going to act like a superscript
if ( NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags))
mPresentationData.flags &= ~NS_MATHML_STRETCH_ALL_CHILDREN_HORIZONTALLY;
// Now transmit any change that we want to our children so that they
// can update their mPresentationData structs
//---------------------------------------------------------------------
/* The REC says:
Within overscript, <mover> always sets displaystyle to "false",
but increments scriptlevel by 1 only when accent is "false".
The TeXBook treats 'over' like a superscript, so p.141 or Rule 13a
say it shouldn't be compressed. However, The TeXBook says
that math accents and \overline change uncramped styles to their
cramped counterparts.
*/
SetIncrementScriptLevel(1, !NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags));
PRUint32 compress = NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags)
? NS_MATHML_COMPRESSED : 0;
PropagatePresentationDataFor(overscriptFrame,
~NS_MATHML_DISPLAYSTYLE | compress,
NS_MATHML_DISPLAYSTYLE | compress);
return NS_OK;
}
/*
The REC says:
* If the base is an operator with movablelimits="true" (or an embellished
operator whose <mo> element core has movablelimits="true"), and
displaystyle="false", then overscript is drawn in a superscript
position. In this case, the accent attribute is ignored. This is
often used for limits on symbols such as &sum;.
i.e.:
if ( NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
// place like superscript
}
else {
// place like overscript
}
*/
/* virtual */ nsresult
nsMathMLmoverFrame::Place(nsRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
{
if ( NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
// place like superscript
return nsMathMLmsupFrame::PlaceSuperScript(PresContext(),
aRenderingContext,
aPlaceOrigin,
aDesiredSize,
this, 0, nsPresContext::CSSPointsToAppUnits(0.5f));
}
////////////////////////////////////
// Get the children's desired sizes
nsBoundingMetrics bmBase, bmOver;
nsHTMLReflowMetrics baseSize;
nsHTMLReflowMetrics overSize;
nsIFrame* overFrame = nsnull;
nsIFrame* baseFrame = mFrames.FirstChild();
if (baseFrame)
overFrame = baseFrame->GetNextSibling();
if (!baseFrame || !overFrame || overFrame->GetNextSibling()) {
// report an error, encourage people to get their markups in order
return ReflowError(aRenderingContext, aDesiredSize);
}
GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase);
GetReflowAndBoundingMetricsFor(overFrame, overSize, bmOver);
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
////////////////////
// Place Children
aRenderingContext.SetFont(GetStyleFont()->mFont,
PresContext()->GetUserFontSet());
nsFontMetrics* fm = aRenderingContext.FontMetrics();
nscoord xHeight = fm->XHeight();
nscoord ruleThickness;
GetRuleThickness (aRenderingContext, fm, ruleThickness);
// there are 2 different types of placement depending on
// whether we want an accented overscript or not
nscoord correction = 0;
GetItalicCorrection (bmBase, correction);
nscoord delta1 = 0; // gap between base and overscript
nscoord delta2 = 0; // extra space above overscript
if (!NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags)) {
// Rule 13a, App. G, TeXbook
nscoord bigOpSpacing1, bigOpSpacing3, bigOpSpacing5, dummy;
GetBigOpSpacings (fm,
bigOpSpacing1, dummy,
bigOpSpacing3, dummy,
bigOpSpacing5);
delta1 = NS_MAX(bigOpSpacing1, (bigOpSpacing3 - bmOver.descent));
delta2 = bigOpSpacing5;
// XXX This is not a TeX rule...
// delta1 (as computed above) can become really big when bmOver.descent is
// negative, e.g., if the content is &OverBar. In such case, we use the height
if (bmOver.descent < 0)
delta1 = NS_MAX(bigOpSpacing1, (bigOpSpacing3 - (bmOver.ascent + bmOver.descent)));
}
else {
// Rule 12, App. G, TeXbook
// We are going to modify this rule to make it more general.
// The idea behind Rule 12 in the TeXBook is to keep the accent
// as close to the base as possible, while ensuring that the
// distance between the *baseline* of the accent char and
// the *baseline* of the base is atleast x-height.
// The idea is that for normal use, we would like all the accents
// on a line to line up atleast x-height above the baseline
// if possible.
// When the ascent of the base is >= x-height,
// the baseline of the accent char is placed just above the base
// (specifically, the baseline of the accent char is placed
// above the baseline of the base by the ascent of the base).
// For ease of implementation,
// this assumes that the font-designer designs accents
// in such a way that the bottom of the accent is atleast x-height
// above its baseline, otherwise there will be collisions
// with the base. Also there should be proper padding between
// the bottom of the accent char and its baseline.
// The above rule may not be obvious from a first
// reading of rule 12 in the TeXBook !!!
// The mathml <mover> tag can use accent chars that
// do not follow this convention. So we modify TeX's rule
// so that TeX's rule gets subsumed for accents that follow
// TeX's convention,
// while also allowing accents that do not follow the convention :
// we try to keep the *bottom* of the accent char atleast x-height
// from the baseline of the base char. we also slap on an extra
// padding between the accent and base chars.
delta1 = ruleThickness + onePixel/2; // we have at least the padding
if (bmBase.ascent < xHeight) {
// also ensure at least x-height above the baseline of the base
delta1 += xHeight - bmBase.ascent;
}
delta2 = ruleThickness;
}
// empty over?
if (!(bmOver.ascent + bmOver.descent)) delta1 = 0;
nscoord dxBase, dxOver = 0;
// Ad-hoc - This is to override fonts which have ready-made _accent_
// glyphs with negative lbearing and rbearing. We want to position
// the overscript ourselves
nscoord overWidth = bmOver.width;
if (!overWidth && (bmOver.rightBearing - bmOver.leftBearing > 0)) {
overWidth = bmOver.rightBearing - bmOver.leftBearing;
dxOver = -bmOver.leftBearing;
}
if (NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags)) {
mBoundingMetrics.width = bmBase.width;
dxOver += correction + (mBoundingMetrics.width - overWidth)/2;
}
else {
mBoundingMetrics.width = NS_MAX(bmBase.width, overWidth);
dxOver += correction/2 + (mBoundingMetrics.width - overWidth)/2;
}
dxBase = (mBoundingMetrics.width - bmBase.width) / 2;
mBoundingMetrics.ascent =
bmOver.ascent + bmOver.descent + delta1 + bmBase.ascent;
mBoundingMetrics.descent = bmBase.descent;
mBoundingMetrics.leftBearing =
NS_MIN(dxBase + bmBase.leftBearing, dxOver + bmOver.leftBearing);
mBoundingMetrics.rightBearing =
NS_MAX(dxBase + bmBase.rightBearing, dxOver + bmOver.rightBearing);
aDesiredSize.ascent =
NS_MAX(mBoundingMetrics.ascent + delta2,
overSize.ascent + bmOver.descent + delta1 + bmBase.ascent);
aDesiredSize.height = aDesiredSize.ascent +
baseSize.height - baseSize.ascent;
aDesiredSize.width = mBoundingMetrics.width;
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
mReference.x = 0;
mReference.y = aDesiredSize.ascent;
if (aPlaceOrigin) {
// place base
nscoord dy = aDesiredSize.ascent - baseSize.ascent;
FinishReflowChild (baseFrame, PresContext(), nsnull, baseSize, dxBase, dy, 0);
// place overscript
dy = aDesiredSize.ascent -
mBoundingMetrics.ascent + bmOver.ascent - overSize.ascent;
FinishReflowChild (overFrame, PresContext(), nsnull, overSize, dxOver, dy, 0);
}
return NS_OK;
}

91
layout/mathml/nsMathMLmoverFrame.h
View File

@ -1,91 +0,0 @@
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla MathML Project.
*
* The Initial Developer of the Original Code is
* The University Of Queensland.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Roger B. Sidje <rbs@maths.uq.edu.au>
* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
* Shyjan Mahamud <mahamud@cs.cmu.edu>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsMathMLmoverFrame_h___
#define nsMathMLmoverFrame_h___
#include "nsCOMPtr.h"
#include "nsMathMLContainerFrame.h"
//
// <mover> -- attach an overscript to a base
//
class nsMathMLmoverFrame : public nsMathMLContainerFrame {
public:
NS_DECL_FRAMEARENA_HELPERS
friend nsIFrame* NS_NewMathMLmoverFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
virtual nsresult
Place(nsRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize);
NS_IMETHOD
InheritAutomaticData(nsIFrame* aParent);
NS_IMETHOD
TransmitAutomaticData();
NS_IMETHOD
UpdatePresentationData(PRUint32 aFlagsValues,
PRUint32 aFlagsToUpdate);
NS_IMETHOD
UpdatePresentationDataFromChildAt(PRInt32 aFirstIndex,
PRInt32 aLastIndex,
PRUint32 aFlagsValues,
PRUint32 aFlagsToUpdate);
NS_IMETHOD
AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType);
protected:
nsMathMLmoverFrame(nsStyleContext* aContext) : nsMathMLContainerFrame(aContext) {}
virtual ~nsMathMLmoverFrame();
virtual PRIntn GetSkipSides() const { return 0; }
};
#endif /* nsMathMLmoverFrame_h___ */

369
layout/mathml/nsMathMLmunderFrame.cpp
View File

@ -1,369 +0,0 @@
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla MathML Project.
*
* The Initial Developer of the Original Code is
* The University Of Queensland.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Roger B. Sidje <rbs@maths.uq.edu.au>
* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
* Shyjan Mahamud <mahamud@cs.cmu.edu>
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsCOMPtr.h"
#include "nsFrame.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsINameSpaceManager.h"
#include "nsRenderingContext.h"
#include "nsMathMLmunderFrame.h"
#include "nsMathMLmsubFrame.h"
//
// <munder> -- attach an underscript to a base - implementation
//
nsIFrame*
NS_NewMathMLmunderFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsMathMLmunderFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmunderFrame)
nsMathMLmunderFrame::~nsMathMLmunderFrame()
{
}
NS_IMETHODIMP
nsMathMLmunderFrame::AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType)
{
if (nsGkAtoms::accentunder_ == aAttribute) {
// When we have automatic data to update within ourselves, we ask our
// parent to re-layout its children
return ReLayoutChildren(mParent);
}
return nsMathMLContainerFrame::
AttributeChanged(aNameSpaceID, aAttribute, aModType);
}
NS_IMETHODIMP
nsMathMLmunderFrame::UpdatePresentationData(PRUint32 aFlagsValues,
PRUint32 aFlagsToUpdate)
{
nsMathMLContainerFrame::UpdatePresentationData(aFlagsValues, aFlagsToUpdate);
// disable the stretch-all flag if we are going to act like a subscript
if ( NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
mPresentationData.flags &= ~NS_MATHML_STRETCH_ALL_CHILDREN_HORIZONTALLY;
}
else {
mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_HORIZONTALLY;
}
return NS_OK;
}
NS_IMETHODIMP
nsMathMLmunderFrame::UpdatePresentationDataFromChildAt(PRInt32 aFirstIndex,
PRInt32 aLastIndex,
PRUint32 aFlagsValues,
PRUint32 aFlagsToUpdate)
{
// munder is special... The REC says:
// Within underscript, <munder> always sets displaystyle to "false",
// but increments scriptlevel by 1 only when accentunder is "false".
// This means that
// 1. don't allow displaystyle to change in the underscript
// 2. if the value of the accent is changed, we need to recompute the
// scriptlevel of the underscript. The problem is that the accent
// can change in the <mo> deep down the embellished hierarchy
// Do #1 here, never allow displaystyle to be changed in the underscript
PRInt32 index = 0;
nsIFrame* childFrame = mFrames.FirstChild();
while (childFrame) {
if ((index >= aFirstIndex) &&
((aLastIndex <= 0) || ((aLastIndex > 0) && (index <= aLastIndex)))) {
if (index > 0) {
// disable the flag
aFlagsToUpdate &= ~NS_MATHML_DISPLAYSTYLE;
aFlagsValues &= ~NS_MATHML_DISPLAYSTYLE;
}
PropagatePresentationDataFor(childFrame, aFlagsValues, aFlagsToUpdate);
}
index++;
childFrame = childFrame->GetNextSibling();
}
return NS_OK;
// For #2, changing the accent attribute will trigger a re-build of
// all automatic data in the embellished hierarchy
}
NS_IMETHODIMP
nsMathMLmunderFrame::InheritAutomaticData(nsIFrame* aParent)
{
// let the base class get the default from our parent
nsMathMLContainerFrame::InheritAutomaticData(aParent);
mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_HORIZONTALLY;
return NS_OK;
}
NS_IMETHODIMP
nsMathMLmunderFrame::TransmitAutomaticData()
{
// At this stage, all our children are in sync and we can fully
// resolve our own mEmbellishData struct
//---------------------------------------------------------------------
/* The REC says:
The default value of accentunder is false, unless underscript
is an <mo> element or an embellished operator. If underscript is
an <mo> element, the value of its accent attribute is used as the
default value of accentunder. If underscript is an embellished
operator, the accent attribute of the <mo> element at its
core is used as the default value. As with all attributes, an
explicitly given value overrides the default.
XXX The winner is the outermost setting in conflicting settings like these:
<munder accent='true'>
<mi>...</mi>
<mo accent='false'> ... </mo>
</munder>
*/
nsIFrame* underscriptFrame = nsnull;
nsIFrame* baseFrame = mFrames.FirstChild();
if (baseFrame)
underscriptFrame = baseFrame->GetNextSibling();
// if our base is an embellished operator, let its state bubble to us (in particular,
// this is where we get the flag for NS_MATHML_EMBELLISH_MOVABLELIMITS). Our flags
// are reset to the default values of false if the base frame isn't embellished.
mPresentationData.baseFrame = baseFrame;
GetEmbellishDataFrom(baseFrame, mEmbellishData);
// The default value of accentunder is false, unless the underscript is embellished
// and its core <mo> is an accent
nsEmbellishData embellishData;
GetEmbellishDataFrom(underscriptFrame, embellishData);
if (NS_MATHML_EMBELLISH_IS_ACCENT(embellishData.flags))
mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTUNDER;
else
mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTUNDER;
// if we have an accentunder attribute, it overrides what the underscript said
nsAutoString value;
if (GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::accentunder_,
value)) {
if (value.EqualsLiteral("true")) {
mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTUNDER;
} else if (value.EqualsLiteral("false")) {
mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTUNDER;
}
}
// disable the stretch-all flag if we are going to act like a superscript
if ( NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags))
mPresentationData.flags &= ~NS_MATHML_STRETCH_ALL_CHILDREN_HORIZONTALLY;
// Now transmit any change that we want to our children so that they
// can update their mPresentationData structs
//---------------------------------------------------------------------
/* The REC says:
Within underscript, <munder> always sets displaystyle to "false",
but increments scriptlevel by 1 only when accentunder is "false".
The TeXBook treats 'under' like a subscript, so p.141 or Rule 13a
say it should be compressed
*/
SetIncrementScriptLevel(1, !NS_MATHML_EMBELLISH_IS_ACCENTUNDER(mEmbellishData.flags));
PropagatePresentationDataFor(underscriptFrame,
~NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED,
NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED);
return NS_OK;
}
/*
The REC says:
* If the base is an operator with movablelimits="true" (or
an embellished operator whose <mo> element core has
movablelimits="true"), and displaystyle="false", then
underscript is drawn in a subscript position. In this case,
the accentunder attribute is ignored. This is often used
for limits on symbols such as &sum;.
i.e.,:
if ( NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
// place like subscript
}
else {
// place like underscript
}
*/
/* virtual */ nsresult
nsMathMLmunderFrame::Place(nsRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
{
if ( NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
// place like subscript
return nsMathMLmsubFrame::PlaceSubScript(PresContext(),
aRenderingContext,
aPlaceOrigin,
aDesiredSize,
this, 0, nsPresContext::CSSPointsToAppUnits(0.5f));
}
////////////////////////////////////
// Get the children's desired sizes
nsBoundingMetrics bmBase, bmUnder;
nsHTMLReflowMetrics baseSize;
nsHTMLReflowMetrics underSize;
nsIFrame* underFrame = nsnull;
nsIFrame* baseFrame = mFrames.FirstChild();
if (baseFrame)
underFrame = baseFrame->GetNextSibling();
if (!baseFrame || !underFrame || underFrame->GetNextSibling()) {
// report an error, encourage people to get their markups in order
return ReflowError(aRenderingContext, aDesiredSize);
}
GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase);
GetReflowAndBoundingMetricsFor(underFrame, underSize, bmUnder);
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
////////////////////
// Place Children
aRenderingContext.SetFont(GetStyleFont()->mFont,
PresContext()->GetUserFontSet());
nsFontMetrics* fm = aRenderingContext.FontMetrics();
nscoord ruleThickness;
GetRuleThickness (aRenderingContext, fm, ruleThickness);
// there are 2 different types of placement depending on
// whether we want an accented under or not
nscoord correction = 0;
GetItalicCorrection (bmBase, correction);
nscoord delta1 = 0; // gap between base and underscript
nscoord delta2 = 0; // extra space beneath underscript
if (!NS_MATHML_EMBELLISH_IS_ACCENTUNDER(mEmbellishData.flags)) {
// Rule 13a, App. G, TeXbook
nscoord bigOpSpacing2, bigOpSpacing4, bigOpSpacing5, dummy;
GetBigOpSpacings (fm,
dummy, bigOpSpacing2,
dummy, bigOpSpacing4,
bigOpSpacing5);
delta1 = NS_MAX(bigOpSpacing2, (bigOpSpacing4 - bmUnder.ascent));
delta2 = bigOpSpacing5;
}
else {
// No corresponding rule in TeXbook - we are on our own here
// XXX tune the gap delta between base and underscript
// Should we use Rule 10 like \underline does?
delta1 = ruleThickness + onePixel/2;
delta2 = ruleThickness;
}
// empty under?
if (!(bmUnder.ascent + bmUnder.descent)) delta1 = 0;
nscoord dxBase, dxUnder = 0;
// Width of non-spacing marks is zero so use left and right bearing.
nscoord underWidth = bmUnder.width;
if (!underWidth) {
underWidth = bmUnder.rightBearing - bmUnder.leftBearing;
dxUnder = -bmUnder.leftBearing;
}
nscoord maxWidth = NS_MAX(bmBase.width, underWidth);
if (NS_MATHML_EMBELLISH_IS_ACCENTUNDER(mEmbellishData.flags)) {
dxUnder += (maxWidth - underWidth)/2;
}
else {
dxUnder += -correction/2 + (maxWidth - underWidth)/2;
}
dxBase = (maxWidth - bmBase.width)/2;
mBoundingMetrics.width =
NS_MAX(dxBase + bmBase.width, dxUnder + bmUnder.width);
mBoundingMetrics.ascent = bmBase.ascent;
mBoundingMetrics.descent =
bmBase.descent + delta1 + bmUnder.ascent + bmUnder.descent;
mBoundingMetrics.leftBearing =
NS_MIN(dxBase + bmBase.leftBearing, dxUnder + bmUnder.leftBearing);
mBoundingMetrics.rightBearing =
NS_MAX(dxBase + bmBase.rightBearing, dxUnder + bmUnder.rightBearing);
aDesiredSize.ascent = baseSize.ascent;
aDesiredSize.height = aDesiredSize.ascent +
NS_MAX(mBoundingMetrics.descent + delta2,
bmBase.descent + delta1 + bmUnder.ascent +
underSize.height - underSize.ascent);
aDesiredSize.width = mBoundingMetrics.width;
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
mReference.x = 0;
mReference.y = aDesiredSize.ascent;
if (aPlaceOrigin) {
nscoord dy = 0;
// place base
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;
}

90
layout/mathml/nsMathMLmunderFrame.h
View File

@ -1,90 +0,0 @@
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla MathML Project.
*
* The Initial Developer of the Original Code is
* The University Of Queensland.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Roger B. Sidje <rbs@maths.uq.edu.au>
* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
* Shyjan Mahamud <mahamud@cs.cmu.edu>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsMathMLmunderFrame_h___
#define nsMathMLmunderFrame_h___
#include "nsCOMPtr.h"
#include "nsMathMLContainerFrame.h"
//
// <munder> -- attach an underscript to a base
//
class nsMathMLmunderFrame : public nsMathMLContainerFrame {
public:
NS_DECL_FRAMEARENA_HELPERS
friend nsIFrame* NS_NewMathMLmunderFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
virtual nsresult
Place(nsRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize);
NS_IMETHOD
InheritAutomaticData(nsIFrame* aParent);
NS_IMETHOD
TransmitAutomaticData();
NS_IMETHOD
UpdatePresentationData(PRUint32 aFlagsValues,
PRUint32 aFlagsToUpdate);
NS_IMETHOD
UpdatePresentationDataFromChildAt(PRInt32 aFirstIndex,
PRInt32 aLastIndex,
PRUint32 aFlagsValues,
PRUint32 aFlagsToUpdate);
NS_IMETHOD
AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType);
protected:
nsMathMLmunderFrame(nsStyleContext* aContext) : nsMathMLContainerFrame(aContext) {}
virtual ~nsMathMLmunderFrame();
virtual PRIntn GetSkipSides() const { return 0; }
};
#endif /* nsMathMLmunderFrame_h___ */

245
layout/mathml/nsMathMLmunderoverFrame.cpp
View File

@ -50,9 +50,13 @@
#include "nsMathMLmunderoverFrame.h"
#include "nsMathMLmsubsupFrame.h"
#include "nsMathMLmsupFrame.h"
#include "nsMathMLmsubFrame.h"
//
// <munderover> -- attach an underscript-overscript pair to a base - implementation
// <mover> -- attach an overscript to a base - implementation
// <munder> -- attach an underscript to a base - implementation
//
nsIFrame*
@ -162,6 +166,22 @@ nsMathMLmunderoverFrame::TransmitAutomaticData()
/*
The REC says:
As regards munder (respectively mover) :
The default value of accentunder is false, unless underscript
is an <mo> element or an embellished operator. If underscript is
an <mo> element, the value of its accent attribute is used as the
default value of accentunder. If underscript is an embellished
operator, the accent attribute of the <mo> element at its
core is used as the default value. As with all attributes, an
explicitly given value overrides the default.
XXX The winner is the outermost setting in conflicting settings like these:
<munder accentunder='true'>
<mi>...</mi>
<mo accentunder='false'> ... </mo>
</munder>
As regards munderover:
The accent and accentunder attributes have the same effect as
the attributes with the same names on <mover> and <munder>,
respectively. Their default values are also computed in the
@ -173,11 +193,23 @@ nsMathMLmunderoverFrame::TransmitAutomaticData()
nsIFrame* overscriptFrame = nsnull;
nsIFrame* underscriptFrame = nsnull;
nsIFrame* baseFrame = mFrames.FirstChild();
if (baseFrame)
underscriptFrame = baseFrame->GetNextSibling();
if (underscriptFrame)
nsIAtom* tag = mContent->Tag();
if (baseFrame) {
if (tag == nsGkAtoms::munder_ ||
tag == nsGkAtoms::munderover_) {
underscriptFrame = baseFrame->GetNextSibling();
} else {
NS_ASSERTION(tag == nsGkAtoms::mover_, "mContent->Tag() not recognized");
overscriptFrame = baseFrame->GetNextSibling();
}
}
if (underscriptFrame &&
tag == nsGkAtoms::munderover_) {
overscriptFrame = underscriptFrame->GetNextSibling();
}
// if our base is an embellished operator, let its state bubble to us (in particular,
// this is where we get the flag for NS_MATHML_EMBELLISH_MOVABLELIMITS). Our flags
// are reset to the default values of false if the base frame isn't embellished.
@ -187,39 +219,47 @@ nsMathMLmunderoverFrame::TransmitAutomaticData()
// The default value of accentunder is false, unless the underscript is embellished
// and its core <mo> is an accent
nsEmbellishData embellishData;
GetEmbellishDataFrom(underscriptFrame, embellishData);
if (NS_MATHML_EMBELLISH_IS_ACCENT(embellishData.flags))
mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTUNDER;
else
mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTUNDER;
// if we have an accentunder attribute, it overrides what the underscript said
nsAutoString value;
if (GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::accentunder_,
value)) {
if (value.EqualsLiteral("true")) {
if (tag == nsGkAtoms::munder_ ||
tag == nsGkAtoms::munderover_) {
GetEmbellishDataFrom(underscriptFrame, embellishData);
if (NS_MATHML_EMBELLISH_IS_ACCENT(embellishData.flags)) {
mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTUNDER;
} else if (value.EqualsLiteral("false")) {
} else {
mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTUNDER;
}
// if we have an accentunder attribute, it overrides what the underscript said
if (GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::accentunder_,
value)) {
if (value.EqualsLiteral("true")) {
mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTUNDER;
} else if (value.EqualsLiteral("false")) {
mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTUNDER;
}
}
}
// The default value of accent is false, unless the overscript is embellished
// and its core <mo> is an accent
GetEmbellishDataFrom(overscriptFrame, embellishData);
if (NS_MATHML_EMBELLISH_IS_ACCENT(embellishData.flags))
mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTOVER;
else
mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTOVER;
// if we have an accent attribute, it overrides what the overscript said
if (GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::accent_,
value)) {
if (value.EqualsLiteral("true")) {
if (tag == nsGkAtoms::mover_ ||
tag == nsGkAtoms::munderover_) {
GetEmbellishDataFrom(overscriptFrame, embellishData);
if (NS_MATHML_EMBELLISH_IS_ACCENT(embellishData.flags)) {
mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTOVER;
} else if (value.EqualsLiteral("false")) {
} else {
mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTOVER;
}
// if we have an accent attribute, it overrides what the overscript said
if (GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::accent_,
value)) {
if (value.EqualsLiteral("true")) {
mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENTOVER;
} else if (value.EqualsLiteral("false")) {
mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENTOVER;
}
}
}
// disable the stretch-all flag if we are going to act like a superscript
@ -243,22 +283,27 @@ nsMathMLmunderoverFrame::TransmitAutomaticData()
that math accents and \overline change uncramped styles to their
cramped counterparts.
*/
PRUint32 compress = NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags)
? NS_MATHML_COMPRESSED : 0;
SetIncrementScriptLevel(2, !NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags));
PropagatePresentationDataFor(overscriptFrame,
~NS_MATHML_DISPLAYSTYLE | compress,
NS_MATHML_DISPLAYSTYLE | compress);
if (tag == nsGkAtoms::mover_ ||
tag == nsGkAtoms::munderover_) {
PRUint32 compress = NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags)
? NS_MATHML_COMPRESSED : 0;
SetIncrementScriptLevel(tag == nsGkAtoms::mover_ ? 1 : 2,
!NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags));
PropagatePresentationDataFor(overscriptFrame,
~NS_MATHML_DISPLAYSTYLE | compress,
NS_MATHML_DISPLAYSTYLE | compress);
}
/*
The TeXBook treats 'under' like a subscript, so p.141 or Rule 13a
say it should be compressed
*/
SetIncrementScriptLevel(1, !NS_MATHML_EMBELLISH_IS_ACCENTUNDER(mEmbellishData.flags));
PropagatePresentationDataFor(underscriptFrame,
~NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED,
NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED);
if (tag == nsGkAtoms::munder_ ||
tag == nsGkAtoms::munderover_) {
SetIncrementScriptLevel(1, !NS_MATHML_EMBELLISH_IS_ACCENTUNDER(mEmbellishData.flags));
PropagatePresentationDataFor(underscriptFrame,
~NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED,
NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED);
}
return NS_OK;
}
@ -286,15 +331,35 @@ nsMathMLmunderoverFrame::Place(nsRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
{
nsIAtom* tag = mContent->Tag();
if ( NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
// place like sub-superscript pair
return nsMathMLmsubsupFrame::PlaceSubSupScript(PresContext(),
aRenderingContext,
aPlaceOrigin,
aDesiredSize,
this, 0, 0,
nsPresContext::CSSPointsToAppUnits(0.5f));
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
//place like sub sup or subsup
nscoord scriptSpace = nsPresContext::CSSPointsToAppUnits(0.5f);
if (tag == nsGkAtoms::munderover_) {
return nsMathMLmsubsupFrame::PlaceSubSupScript(PresContext(),
aRenderingContext,
aPlaceOrigin,
aDesiredSize,
this, 0, 0,
scriptSpace);
} else if (tag == nsGkAtoms::munder_) {
return nsMathMLmsubFrame::PlaceSubScript(PresContext(),
aRenderingContext,
aPlaceOrigin,
aDesiredSize,
this, 0,
scriptSpace);
} else {
NS_ASSERTION(tag == nsGkAtoms::mover_, "mContent->Tag() not recognized");
return nsMathMLmsupFrame::PlaceSuperScript(PresContext(),
aRenderingContext,
aPlaceOrigin,
aDesiredSize,
this, 0,
scriptSpace);
}
}
////////////////////////////////////
@ -307,17 +372,45 @@ nsMathMLmunderoverFrame::Place(nsRenderingContext& aRenderingContext,
nsIFrame* overFrame = nsnull;
nsIFrame* underFrame = nsnull;
nsIFrame* baseFrame = mFrames.FirstChild();
if (baseFrame)
underFrame = baseFrame->GetNextSibling();
if (underFrame)
underSize.ascent = 0;
overSize.ascent = 0;
if (baseFrame) {
if (tag == nsGkAtoms::munder_ ||
tag == nsGkAtoms::munderover_) {
underFrame = baseFrame->GetNextSibling();
} else if (tag == nsGkAtoms::mover_) {
overFrame = baseFrame->GetNextSibling();
}
}
if (underFrame && tag == nsGkAtoms::munderover_) {
overFrame = underFrame->GetNextSibling();
if (!baseFrame || !underFrame || !overFrame || overFrame->GetNextSibling()) {
// report an error, encourage people to get their markups in order
return ReflowError(aRenderingContext, aDesiredSize);
}
if (tag == nsGkAtoms::munder_) {
if (!baseFrame || !underFrame || underFrame->GetNextSibling()) {
// report an error, encourage people to get their markups in order
return ReflowError(aRenderingContext, aDesiredSize);
}
}
if (tag == nsGkAtoms::mover_) {
if (!baseFrame || !overFrame || overFrame->GetNextSibling()) {
// report an error, encourage people to get their markups in order
return ReflowError(aRenderingContext, aDesiredSize);
}
}
if (tag == nsGkAtoms::munderover_) {
if (!baseFrame || !underFrame || !overFrame || overFrame->GetNextSibling()) {
// report an error, encourage people to get their markups in order
return ReflowError(aRenderingContext, aDesiredSize);
}
}
GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase);
GetReflowAndBoundingMetricsFor(underFrame, underSize, bmUnder);
GetReflowAndBoundingMetricsFor(overFrame, overSize, bmOver);
if (underFrame) {
GetReflowAndBoundingMetricsFor(underFrame, underSize, bmUnder);
}
if (overFrame) {
GetReflowAndBoundingMetricsFor(overFrame, overSize, bmOver);
}
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
@ -387,8 +480,37 @@ nsMathMLmunderoverFrame::Place(nsRenderingContext& aRenderingContext,
}
else {
// Rule 12, App. G, TeXbook
// We are going to modify this rule to make it more general.
// The idea behind Rule 12 in the TeXBook is to keep the accent
// as close to the base as possible, while ensuring that the
// distance between the *baseline* of the accent char and
// the *baseline* of the base is atleast x-height.
// The idea is that for normal use, we would like all the accents
// on a line to line up atleast x-height above the baseline
// if possible.
// When the ascent of the base is >= x-height,
// the baseline of the accent char is placed just above the base
// (specifically, the baseline of the accent char is placed
// above the baseline of the base by the ascent of the base).
// For ease of implementation,
// this assumes that the font-designer designs accents
// in such a way that the bottom of the accent is atleast x-height
// above its baseline, otherwise there will be collisions
// with the base. Also there should be proper padding between
// the bottom of the accent char and its baseline.
// The above rule may not be obvious from a first
// reading of rule 12 in the TeXBook !!!
// The mathml <mover> tag can use accent chars that
// do not follow this convention. So we modify TeX's rule
// so that TeX's rule gets subsumed for accents that follow
// TeX's convention,
// while also allowing accents that do not follow the convention :
// we try to keep the *bottom* of the accent char atleast x-height
// from the baseline of the base char. we also slap on an extra
// padding between the accent and base chars.
overDelta1 = ruleThickness + onePixel/2;
if (bmBase.ascent < xHeight) {
if (bmBase.ascent < xHeight) {
// also ensure at least x-height above the baseline of the base
overDelta1 += xHeight - bmBase.ascent;
}
overDelta2 = ruleThickness;
@ -494,14 +616,21 @@ nsMathMLmunderoverFrame::Place(nsRenderingContext& aRenderingContext,
if (aPlaceOrigin) {
nscoord dy;
// place overscript
dy = aDesiredSize.ascent - mBoundingMetrics.ascent + bmOver.ascent - overSize.ascent;
FinishReflowChild (overFrame, PresContext(), nsnull, overSize, dxOver, dy, 0);
if (overFrame) {
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);
if (underFrame) {
dy = aDesiredSize.ascent + mBoundingMetrics.descent - bmUnder.descent
- underSize.ascent;
FinishReflowChild (underFrame, PresContext(), nsnull, underSize,
dxUnder, dy, 0);
}
}
return NS_OK;
}