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b=297467 menclose r=karlt rs=roc

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This commit is contained in:
Frédéric Wang 2009-05-29 13:08:35 +02:00
parent 3887592348
commit e13641fddf
9 changed files with 1014 additions and 317 deletions
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3
layout/base/nsCSSFrameConstructor.cpp
View File

@ -4822,7 +4822,8 @@ nsCSSFrameConstructor::FindMathMLData(nsIContent* aContent,
SIMPLE_MATHML_CREATE(mroot_, NS_NewMathMLmrootFrame),
SIMPLE_MATHML_CREATE(maction_, NS_NewMathMLmactionFrame),
SIMPLE_MATHML_CREATE(mrow_, NS_NewMathMLmrowFrame),
SIMPLE_MATHML_CREATE(merror_, NS_NewMathMLmrowFrame)
SIMPLE_MATHML_CREATE(merror_, NS_NewMathMLmrowFrame),
SIMPLE_MATHML_CREATE(menclose_, NS_NewMathMLmencloseFrame)
};
return FindDataByTag(aTag, aContent, aStyleContext, sMathMLData,

1
layout/mathml/Makefile.in
View File

@ -103,6 +103,7 @@ CPPSRCS = nsMathMLChar.cpp \
nsMathMLmsqrtFrame.cpp \
nsMathMLmrootFrame.cpp \
nsMathMLmactionFrame.cpp \
nsMathMLmencloseFrame.cpp \
$(NULL)
include $(topsrcdir)/config/config.mk

6
layout/mathml/nsMathMLContainerFrame.cpp
View File

@ -1063,7 +1063,7 @@ nsMathMLContainerFrame::GetIntrinsicWidth(nsIRenderingContext* aRenderingContext
// Measure
nsHTMLReflowMetrics desiredSize;
nsresult rv = MeasureChildFrames(*aRenderingContext, desiredSize);
nsresult rv = MeasureForWidth(*aRenderingContext, desiredSize);
if (NS_FAILED(rv)) {
ReflowError(*aRenderingContext, desiredSize);
}
@ -1074,8 +1074,8 @@ nsMathMLContainerFrame::GetIntrinsicWidth(nsIRenderingContext* aRenderingContext
}
/* virtual */ nsresult
nsMathMLContainerFrame::MeasureChildFrames(nsIRenderingContext& aRenderingContext,
nsHTMLReflowMetrics& aDesiredSize)
nsMathMLContainerFrame::MeasureForWidth(nsIRenderingContext& aRenderingContext,
nsHTMLReflowMetrics& aDesiredSize)
{
return Place(aRenderingContext, PR_FALSE, aDesiredSize);
}

12
layout/mathml/nsMathMLContainerFrame.h
View File

@ -229,17 +229,17 @@ protected:
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize);
// MeasureChildFrames:
// MeasureForWidth:
//
// A method used by nsMathMLContainerFrame::GetIntrinsicWidth to get the
// width that a particular Place method desires. For most frames, this will
// just call the object's Place method. However <msqrt> uses
// just call the object's Place method. However <msqrt> and <menclose> use
// nsMathMLContainerFrame::GetIntrinsicWidth to measure the child frames as
// if in an <mrow>, and so <msqrt> frames implement MeasureChildFrames to
// use nsMathMLContainerFrame::Place.
// if in an <mrow>, and so their frames implement MeasureForWidth to use
// nsMathMLContainerFrame::Place.
virtual nsresult
MeasureChildFrames(nsIRenderingContext& aRenderingContext,
nsHTMLReflowMetrics& aDesiredSize);
MeasureForWidth(nsIRenderingContext& aRenderingContext,
nsHTMLReflowMetrics& aDesiredSize);
// helper to re-sync the automatic data in our children and notify our parent to

1
layout/mathml/nsMathMLParts.h
View File

@ -69,6 +69,7 @@ nsIFrame* NS_NewMathMLmtdInnerFrame(nsIPresShell* aPresShell, nsStyleContext* aC
nsIFrame* NS_NewMathMLmsqrtFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame* NS_NewMathMLmrootFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame* NS_NewMathMLmactionFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame* NS_NewMathMLmencloseFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame* NS_NewMathMLmathBlockFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, PRUint32 aFlags);
nsIFrame* NS_NewMathMLmathInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);

826
layout/mathml/nsMathMLmencloseFrame.cpp Normal file
View File

@ -0,0 +1,826 @@
/* -*- 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>
* Vilya Harvey <vilya@nag.co.uk>
* Shyjan Mahamud <mahamud@cs.cmu.edu>
* Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
* Frederic Wang <fred.wang@free.fr> - extension of <msqrt/> to <menclose/>
*
* 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 "nsIRenderingContext.h"
#include "nsIFontMetrics.h"
#include "nsWhitespaceTokenizer.h"
#include "nsMathMLmencloseFrame.h"
#include "nsDisplayList.h"
#include "gfxContext.h"
//
// <menclose> -- enclose content with a stretching symbol such
// as a long division sign. - implementation
// longdiv:
// Unicode 5.1 assigns U+27CC to LONG DIVISION, but a right parenthesis
// renders better with current font support.
static const PRUnichar kLongDivChar = ')';
// radical: 'SQUARE ROOT'
static const PRUnichar kRadicalChar = 0x221A;
nsIFrame*
NS_NewMathMLmencloseFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsMathMLmencloseFrame(aContext);
}
nsMathMLmencloseFrame::nsMathMLmencloseFrame(nsStyleContext* aContext) :
nsMathMLContainerFrame(aContext), mNotationsToDraw(0),
mLongDivCharIndex(-1), mRadicalCharIndex(-1), mContentWidth(0)
{
}
nsMathMLmencloseFrame::~nsMathMLmencloseFrame()
{
}
nsresult nsMathMLmencloseFrame::AllocateMathMLChar(nsMencloseNotation mask)
{
// Is the char already allocated?
if ((mask == NOTATION_LONGDIV && mLongDivCharIndex >= 0) ||
(mask == NOTATION_RADICAL && mRadicalCharIndex >= 0))
return NS_OK;
// No need to track the style context given to our MathML chars.
// The Style System will use Get/SetAdditionalStyleContext() to keep it
// up-to-date if dynamic changes arise.
PRUint32 i = mMathMLChar.Length();
nsAutoString Char;
if (!mMathMLChar.AppendElement())
return NS_ERROR_OUT_OF_MEMORY;
if (mask == NOTATION_LONGDIV) {
Char.Assign(kLongDivChar);
mLongDivCharIndex = i;
} else if (mask == NOTATION_RADICAL) {
Char.Assign(kRadicalChar);
mRadicalCharIndex = i;
}
nsPresContext *presContext = PresContext();
mMathMLChar[i].SetData(presContext, Char);
ResolveMathMLCharStyle(presContext, mContent, mStyleContext,
&mMathMLChar[i],
PR_TRUE);
return NS_OK;
}
/*
* Add a notation to draw, if the argument is the name of a known notation.
* @param aNotation string name of a notation
*/
nsresult nsMathMLmencloseFrame::AddNotation(const nsAString& aNotation)
{
nsresult rv;
if (aNotation.EqualsLiteral("longdiv")) {
rv = AllocateMathMLChar(NOTATION_LONGDIV);
NS_ENSURE_SUCCESS(rv, rv);
mNotationsToDraw |= NOTATION_LONGDIV;
} else if (aNotation.EqualsLiteral("actuarial")) {
mNotationsToDraw |= (NOTATION_RIGHT | NOTATION_TOP);
} else if (aNotation.EqualsLiteral("radical")) {
rv = AllocateMathMLChar(NOTATION_RADICAL);
NS_ENSURE_SUCCESS(rv, rv);
mNotationsToDraw |= NOTATION_RADICAL;
} else if (aNotation.EqualsLiteral("box")) {
mNotationsToDraw |= (NOTATION_LEFT | NOTATION_RIGHT |
NOTATION_TOP | NOTATION_BOTTOM);
} else if (aNotation.EqualsLiteral("roundedbox")) {
mNotationsToDraw |= NOTATION_ROUNDEDBOX;
} else if (aNotation.EqualsLiteral("circle")) {
mNotationsToDraw |= NOTATION_CIRCLE;
} else if (aNotation.EqualsLiteral("left")) {
mNotationsToDraw |= NOTATION_LEFT;
} else if (aNotation.EqualsLiteral("right")) {
mNotationsToDraw |= NOTATION_RIGHT;
} else if (aNotation.EqualsLiteral("top")) {
mNotationsToDraw |= NOTATION_TOP;
} else if (aNotation.EqualsLiteral("bottom")) {
mNotationsToDraw |= NOTATION_BOTTOM;
} else if (aNotation.EqualsLiteral("updiagonalstrike")) {
mNotationsToDraw |= NOTATION_UPDIAGONALSTRIKE;
} else if (aNotation.EqualsLiteral("downdiagonalstrike")) {
mNotationsToDraw |= NOTATION_DOWNDIAGONALSTRIKE;
} else if (aNotation.EqualsLiteral("verticalstrike")) {
mNotationsToDraw |= NOTATION_VERTICALSTRIKE;
} else if (aNotation.EqualsLiteral("horizontalstrike")) {
mNotationsToDraw |= NOTATION_HORIZONTALSTRIKE;
}
return NS_OK;
}
/*
* Initialize the list of notations to draw
*/
void nsMathMLmencloseFrame::InitNotations()
{
nsAutoString value;
if (mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::notation_, value)) {
// parse the notation attribute
nsWhitespaceTokenizer tokenizer(value);
while (tokenizer.hasMoreTokens())
AddNotation(tokenizer.nextToken());
} else {
// default: longdiv
if (NS_FAILED(AllocateMathMLChar(NOTATION_LONGDIV)))
return;
mNotationsToDraw = NOTATION_LONGDIV;
}
}
NS_IMETHODIMP
nsMathMLmencloseFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsMathMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
NS_ENSURE_SUCCESS(rv, rv);
InitNotations();
return NS_OK;
}
NS_IMETHODIMP
nsMathMLmencloseFrame::InheritAutomaticData(nsIFrame* aParent)
{
// let the base class get the default from our parent
nsMathMLContainerFrame::InheritAutomaticData(aParent);
mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
return NS_OK;
}
NS_IMETHODIMP
nsMathMLmencloseFrame::TransmitAutomaticData()
{
if (IsToDraw(NOTATION_RADICAL)) {
// The TeXBook (Ch 17. p.141) says that \sqrt is cramped
UpdatePresentationDataFromChildAt(0, -1,
NS_MATHML_COMPRESSED,
NS_MATHML_COMPRESSED);
}
return NS_OK;
}
NS_IMETHODIMP
nsMathMLmencloseFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
/////////////
// paint the menclosed content
nsresult rv = nsMathMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect,
aLists);
NS_ENSURE_SUCCESS(rv, rv);
if (NS_MATHML_HAS_ERROR(mPresentationData.flags))
return rv;
nsRect mencloseRect = nsIFrame::GetRect();
mencloseRect.x = mencloseRect.y = 0;
if (IsToDraw(NOTATION_RADICAL)) {
rv = mMathMLChar[mRadicalCharIndex].Display(aBuilder, this, aLists);
NS_ENSURE_SUCCESS(rv, rv);
nsRect rect;
mMathMLChar[mRadicalCharIndex].GetRect(rect);
rect.MoveBy(rect.width, 0);
rect.SizeTo(mContentWidth, mRuleThickness);
rv = DisplayBar(aBuilder, this, rect, aLists);
NS_ENSURE_SUCCESS(rv, rv);
}
if (IsToDraw(NOTATION_LONGDIV)) {
rv = mMathMLChar[mLongDivCharIndex].Display(aBuilder, this, aLists);
NS_ENSURE_SUCCESS(rv, rv);
nsRect rect;
mMathMLChar[mLongDivCharIndex].GetRect(rect);
rect.SizeTo(rect.width + mContentWidth, mRuleThickness);
rv = DisplayBar(aBuilder, this, rect, aLists);
NS_ENSURE_SUCCESS(rv, rv);
}
if (IsToDraw(NOTATION_TOP)) {
nsRect rect(0, 0, mencloseRect.width, mRuleThickness);
rv = DisplayBar(aBuilder, this, rect, aLists);
NS_ENSURE_SUCCESS(rv, rv);
}
if (IsToDraw(NOTATION_BOTTOM)) {
nsRect rect(0, mencloseRect.height - mRuleThickness,
mencloseRect.width, mRuleThickness);
rv = DisplayBar(aBuilder, this, rect, aLists);
NS_ENSURE_SUCCESS(rv, rv);
}
if (IsToDraw(NOTATION_LEFT)) {
nsRect rect(0, 0, mRuleThickness, mencloseRect.height);
rv = DisplayBar(aBuilder, this, rect, aLists);
NS_ENSURE_SUCCESS(rv, rv);
}
if (IsToDraw(NOTATION_RIGHT)) {
nsRect rect(mencloseRect.width - mRuleThickness, 0,
mRuleThickness, mencloseRect.height);
rv = DisplayBar(aBuilder, this, rect, aLists);
NS_ENSURE_SUCCESS(rv, rv);
}
if (IsToDraw(NOTATION_ROUNDEDBOX)) {
rv = DisplayNotation(aBuilder, this, mencloseRect, aLists,
mRuleThickness, NOTATION_ROUNDEDBOX);
NS_ENSURE_SUCCESS(rv, rv);
}
if (IsToDraw(NOTATION_CIRCLE)) {
rv = DisplayNotation(aBuilder, this, mencloseRect, aLists,
mRuleThickness, NOTATION_CIRCLE);
NS_ENSURE_SUCCESS(rv, rv);
}
if (IsToDraw(NOTATION_UPDIAGONALSTRIKE)) {
rv = DisplayNotation(aBuilder, this, mencloseRect, aLists,
mRuleThickness, NOTATION_UPDIAGONALSTRIKE);
NS_ENSURE_SUCCESS(rv, rv);
}
if (IsToDraw(NOTATION_DOWNDIAGONALSTRIKE)) {
rv = DisplayNotation(aBuilder, this, mencloseRect, aLists,
mRuleThickness, NOTATION_DOWNDIAGONALSTRIKE);
NS_ENSURE_SUCCESS(rv, rv);
}
if (IsToDraw(NOTATION_HORIZONTALSTRIKE)) {
nsRect rect(0, mencloseRect.height / 2 - mRuleThickness / 2,
mencloseRect.width, mRuleThickness);
rv = DisplayBar(aBuilder, this, rect, aLists);
NS_ENSURE_SUCCESS(rv, rv);
}
if (IsToDraw(NOTATION_VERTICALSTRIKE)) {
nsRect rect(mencloseRect.width / 2 - mRuleThickness / 2, 0,
mRuleThickness, mencloseRect.height);
rv = DisplayBar(aBuilder, this, rect, aLists);
NS_ENSURE_SUCCESS(rv, rv);
}
return rv;
}
/* virtual */ nsresult
nsMathMLmencloseFrame::MeasureForWidth(nsIRenderingContext& aRenderingContext,
nsHTMLReflowMetrics& aDesiredSize)
{
return PlaceInternal(aRenderingContext, PR_FALSE, aDesiredSize, PR_TRUE);
}
/* virtual */ nsresult
nsMathMLmencloseFrame::Place(nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
{
return PlaceInternal(aRenderingContext, aPlaceOrigin, aDesiredSize, PR_FALSE);
}
/* virtual */ nsresult
nsMathMLmencloseFrame::PlaceInternal(nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize,
PRBool aWidthOnly)
{
///////////////
// Measure the size of our content using the base class to format like an
// inferred mrow.
nsHTMLReflowMetrics baseSize;
nsresult rv =
nsMathMLContainerFrame::Place(aRenderingContext, PR_FALSE, baseSize);
if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
DidReflowChildren(GetFirstChild(nsnull));
return rv;
}
nsBoundingMetrics bmBase = baseSize.mBoundingMetrics;
nscoord dx_left = 0, dx_right = 0;
nsBoundingMetrics bmLongdivChar, bmRadicalChar;
nscoord radicalAscent = 0, radicalDescent = 0;
nscoord longdivAscent = 0, longdivDescent = 0;
nscoord psi = 0;
///////////////
// Thickness of bars and font metrics
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
nsCOMPtr<nsIFontMetrics> fm;
nscoord mEmHeight;
aRenderingContext.SetFont(GetStyleFont()->mFont, nsnull,
PresContext()->GetUserFontSet());
aRenderingContext.GetFontMetrics(*getter_AddRefs(fm));
GetRuleThickness(aRenderingContext, fm, mRuleThickness);
GetEmHeight(fm, mEmHeight);
nsBoundingMetrics bmOne;
aRenderingContext.GetBoundingMetrics(NS_LITERAL_STRING("1").get(), 1, bmOne);
///////////////
// General rules: the menclose element takes the size of the enclosed content.
// We add a padding when needed.
// determine padding & psi
nscoord padding = 3 * mRuleThickness;
nscoord delta = padding % onePixel;
if (delta)
padding += onePixel - delta; // round up
if (IsToDraw(NOTATION_LONGDIV) || IsToDraw(NOTATION_RADICAL)) {
nscoord phi;
// Rule 11, App. G, TeXbook
// psi = clearance between rule and content
if (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags))
fm->GetXHeight(phi);
else
phi = mRuleThickness;
psi = mRuleThickness + phi / 4;
delta = psi % onePixel;
if (delta)
psi += onePixel - delta; // round up
}
if (mRuleThickness < onePixel)
mRuleThickness = onePixel;
// Set horizontal parameters
if (IsToDraw(NOTATION_ROUNDEDBOX) ||
IsToDraw(NOTATION_TOP) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_BOTTOM) ||
IsToDraw(NOTATION_CIRCLE))
dx_left = padding;
if (IsToDraw(NOTATION_ROUNDEDBOX) ||
IsToDraw(NOTATION_TOP) ||
IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_BOTTOM) ||
IsToDraw(NOTATION_CIRCLE))
dx_right = padding;
// Set vertical parameters
if (IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
IsToDraw(NOTATION_VERTICALSTRIKE) ||
IsToDraw(NOTATION_CIRCLE) ||
IsToDraw(NOTATION_ROUNDEDBOX) ||
IsToDraw(NOTATION_RADICAL) ||
IsToDraw(NOTATION_LONGDIV)) {
// set a minimal value for the base height
bmBase.ascent = PR_MAX(bmOne.ascent, bmBase.ascent);
bmBase.descent = PR_MAX(0, bmBase.descent);
}
mBoundingMetrics.ascent = bmBase.ascent;
mBoundingMetrics.descent = bmBase.descent;
if (IsToDraw(NOTATION_ROUNDEDBOX) ||
IsToDraw(NOTATION_TOP) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_CIRCLE))
mBoundingMetrics.ascent += padding;
if (IsToDraw(NOTATION_ROUNDEDBOX) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_BOTTOM) ||
IsToDraw(NOTATION_CIRCLE))
mBoundingMetrics.descent += padding;
///////////////
// circle notation: we don't want the ellipse to overlap the enclosed
// content. Hence, we need to increase the size of the bounding box by a
// factor of at least sqrt(2).
if (IsToDraw(NOTATION_CIRCLE)) {
double ratio = (sqrt(2) - 1) / 2;
nscoord padding2;
// Update horizontal parameters
padding2 = ratio * bmBase.width;
dx_left = PR_MAX(dx_left, padding2);
dx_right = PR_MAX(dx_right, padding2);
// Update vertical parameters
padding2 = ratio * (bmBase.ascent + bmBase.descent);
mBoundingMetrics.ascent = PR_MAX(mBoundingMetrics.ascent,
bmBase.ascent + padding2);
mBoundingMetrics.descent = PR_MAX(mBoundingMetrics.descent,
bmBase.descent + padding2);
}
///////////////
// longdiv notation:
if (IsToDraw(NOTATION_LONGDIV)) {
if (aWidthOnly) {
nscoord longdiv_width = mMathMLChar[mLongDivCharIndex].
GetMaxWidth(PresContext(), aRenderingContext);
// Update horizontal parameters
dx_left = PR_MAX(dx_left, longdiv_width);
} else {
// Stretch the parenthesis to the appropriate height if it is not
// big enough.
nsBoundingMetrics contSize = bmBase;
contSize.ascent = mRuleThickness;
contSize.descent = bmBase.ascent + bmBase.descent + psi;
// height(longdiv) should be >= height(base) + psi + mRuleThickness
mMathMLChar[mLongDivCharIndex].Stretch(PresContext(), aRenderingContext,
NS_STRETCH_DIRECTION_VERTICAL,
contSize, bmLongdivChar,
NS_STRETCH_LARGER);
mMathMLChar[mLongDivCharIndex].GetBoundingMetrics(bmLongdivChar);
// Update horizontal parameters
dx_left = PR_MAX(dx_left, bmLongdivChar.width);
// Update vertical parameters
longdivAscent = bmBase.ascent + psi + mRuleThickness;
longdivDescent = PR_MAX(bmBase.descent,
(bmLongdivChar.ascent + bmLongdivChar.descent -
longdivAscent));
mBoundingMetrics.ascent = PR_MAX(mBoundingMetrics.ascent,
longdivAscent);
mBoundingMetrics.descent = PR_MAX(mBoundingMetrics.descent,
longdivDescent);
}
}
///////////////
// radical notation:
if (IsToDraw(NOTATION_RADICAL)) {
if (aWidthOnly) {
nscoord radical_width = mMathMLChar[mRadicalCharIndex].
GetMaxWidth(PresContext(), aRenderingContext);
// Update horizontal parameters
dx_left = PR_MAX(dx_left, radical_width);
} else {
// Stretch the radical symbol to the appropriate height if it is not
// big enough.
nsBoundingMetrics contSize = bmBase;
contSize.ascent = mRuleThickness;
contSize.descent = bmBase.ascent + bmBase.descent + psi;
// height(radical) should be >= height(base) + psi + mRuleThickness
mMathMLChar[mRadicalCharIndex].Stretch(PresContext(), aRenderingContext,
NS_STRETCH_DIRECTION_VERTICAL,
contSize, bmRadicalChar,
NS_STRETCH_LARGER);
mMathMLChar[mRadicalCharIndex].GetBoundingMetrics(bmRadicalChar);
// Update horizontal parameters
dx_left = PR_MAX(dx_left, bmRadicalChar.width);
// Update vertical parameters
radicalAscent = bmBase.ascent + psi + mRuleThickness;
radicalDescent = PR_MAX(bmBase.descent,
(bmRadicalChar.ascent + bmRadicalChar.descent -
radicalAscent));
mBoundingMetrics.ascent = PR_MAX(mBoundingMetrics.ascent,
radicalAscent);
mBoundingMetrics.descent = PR_MAX(mBoundingMetrics.descent,
radicalDescent);
}
}
///////////////
//
if (IsToDraw(NOTATION_CIRCLE) ||
IsToDraw(NOTATION_ROUNDEDBOX) ||
(IsToDraw(NOTATION_LEFT) && IsToDraw(NOTATION_RIGHT))) {
// center the menclose around the content (horizontally)
dx_left = dx_right = PR_MAX(dx_left, dx_right);
}
///////////////
// The maximum size is now computed: set the remaining parameters
mBoundingMetrics.width = dx_left + bmBase.width + dx_right;
mBoundingMetrics.leftBearing = PR_MIN(0, dx_left + bmBase.leftBearing);
mBoundingMetrics.rightBearing =
PR_MAX(mBoundingMetrics.width, dx_left + bmBase.rightBearing);
aDesiredSize.width = mBoundingMetrics.width;
aDesiredSize.ascent = PR_MAX(mBoundingMetrics.ascent, baseSize.ascent);
aDesiredSize.height = aDesiredSize.ascent +
PR_MAX(mBoundingMetrics.descent, baseSize.height - baseSize.ascent);
if (IsToDraw(NOTATION_LONGDIV) || IsToDraw(NOTATION_RADICAL)) {
// get the leading to be left at the top of the resulting frame
// this seems more reliable than using fm->GetLeading() on suspicious
// fonts
nscoord leading = nscoord(0.2f * mEmHeight);
nscoord desiredSizeAscent = aDesiredSize.ascent;
nscoord desiredSizeDescent = aDesiredSize.height - aDesiredSize.ascent;
if (IsToDraw(NOTATION_LONGDIV)) {
desiredSizeAscent = PR_MAX(desiredSizeAscent,
longdivAscent + leading);
desiredSizeDescent = PR_MAX(desiredSizeDescent,
longdivDescent + mRuleThickness);
}
if (IsToDraw(NOTATION_RADICAL)) {
desiredSizeAscent = PR_MAX(desiredSizeAscent,
radicalAscent + leading);
desiredSizeDescent = PR_MAX(desiredSizeDescent,
radicalDescent + mRuleThickness);
}
aDesiredSize.ascent = desiredSizeAscent;
aDesiredSize.height = desiredSizeAscent + desiredSizeDescent;
}
if (IsToDraw(NOTATION_CIRCLE) ||
IsToDraw(NOTATION_ROUNDEDBOX) ||
(IsToDraw(NOTATION_TOP) && IsToDraw(NOTATION_BOTTOM))) {
// center the menclose around the content (vertically)
nscoord dy = PR_MAX(aDesiredSize.ascent - bmBase.ascent,
aDesiredSize.height - aDesiredSize.ascent -
bmBase.descent);
aDesiredSize.ascent = bmBase.ascent + dy;
aDesiredSize.height = aDesiredSize.ascent + bmBase.descent + dy;
}
// Update mBoundingMetrics ascent/descent
if (IsToDraw(NOTATION_TOP) ||
IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
IsToDraw(NOTATION_VERTICALSTRIKE) ||
IsToDraw(NOTATION_CIRCLE) ||
IsToDraw(NOTATION_ROUNDEDBOX))
mBoundingMetrics.ascent = aDesiredSize.ascent;
if (IsToDraw(NOTATION_BOTTOM) ||
IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
IsToDraw(NOTATION_VERTICALSTRIKE) ||
IsToDraw(NOTATION_CIRCLE) ||
IsToDraw(NOTATION_ROUNDEDBOX))
mBoundingMetrics.descent = aDesiredSize.height - aDesiredSize.ascent;
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
mReference.x = 0;
mReference.y = aDesiredSize.ascent;
if (aPlaceOrigin) {
//////////////////
// Set position and size of MathMLChars
if (IsToDraw(NOTATION_LONGDIV))
mMathMLChar[mLongDivCharIndex].SetRect(nsRect(dx_left -
bmLongdivChar.width,
aDesiredSize.ascent -
longdivAscent,
bmLongdivChar.width,
bmLongdivChar.ascent +
bmLongdivChar.descent));
if (IsToDraw(NOTATION_RADICAL))
mMathMLChar[mRadicalCharIndex].SetRect(nsRect(dx_left -
bmRadicalChar.width,
aDesiredSize.ascent -
radicalAscent,
bmRadicalChar.width,
bmRadicalChar.ascent +
bmRadicalChar.descent));
mContentWidth = bmBase.width;
//////////////////
// Finish reflowing child frames
PositionRowChildFrames(dx_left, aDesiredSize.ascent);
}
return NS_OK;
}
nscoord
nsMathMLmencloseFrame::FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize)
{
nscoord gap = nsMathMLContainerFrame::FixInterFrameSpacing(aDesiredSize);
if (!gap)
return 0;
// Move the MathML characters
nsRect rect;
for (PRUint32 i = 0; i < mMathMLChar.Length(); i++) {
mMathMLChar[i].GetRect(rect);
rect.MoveBy(gap, 0);
mMathMLChar[i].SetRect(rect);
}
return gap;
}
NS_IMETHODIMP
nsMathMLmencloseFrame::AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType)
{
if (aAttribute == nsGkAtoms::notation_) {
mNotationsToDraw = 0;
mLongDivCharIndex = mRadicalCharIndex = -1;
mMathMLChar.Clear();
InitNotations();
}
return nsMathMLContainerFrame::
AttributeChanged(aNameSpaceID, aAttribute, aModType);
}
//////////////////
// the Style System will use these to pass the proper style context to our
// MathMLChar
nsStyleContext*
nsMathMLmencloseFrame::GetAdditionalStyleContext(PRInt32 aIndex) const
{
PRInt32 len = mMathMLChar.Length();
if (aIndex >= 0 && aIndex < len)
return mMathMLChar[aIndex].GetStyleContext();
else
return nsnull;
}
void
nsMathMLmencloseFrame::SetAdditionalStyleContext(PRInt32 aIndex,
nsStyleContext* aStyleContext)
{
PRInt32 len = mMathMLChar.Length();
if (aIndex >= 0 && aIndex < len)
mMathMLChar[aIndex].SetStyleContext(aStyleContext);
}
class nsDisplayNotation : public nsDisplayItem
{
public:
nsDisplayNotation(nsIFrame* aFrame, const nsRect& aRect,
nscoord aThickness, nsMencloseNotation aType)
: nsDisplayItem(aFrame), mRect(aRect),
mThickness(aThickness), mType(aType) {
MOZ_COUNT_CTOR(nsDisplayNotation);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplayNotation() {
MOZ_COUNT_DTOR(nsDisplayNotation);
}
#endif
virtual void Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx,
const nsRect& aDirtyRect);
NS_DISPLAY_DECL_NAME("MathMLMencloseNotation")
private:
nsRect mRect;
nscoord mThickness;
nsMencloseNotation mType;
};
void nsDisplayNotation::Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx,
const nsRect& aDirtyRect)
{
// get the gfxRect
nsPresContext* presContext = mFrame->PresContext();
gfxRect rect = presContext->
AppUnitsToGfxUnits(mRect + aBuilder->ToReferenceFrame(mFrame));
// paint the frame with the current text color
aCtx->SetColor(mFrame->GetStyleColor()->mColor);
// change line width to mThickness
gfxContext *gfxCtx = aCtx->ThebesContext();
gfxFloat currentLineWidth = gfxCtx->CurrentLineWidth();
gfxFloat e = presContext->AppUnitsToGfxUnits(mThickness);
gfxCtx->SetLineWidth(e);
rect.Inset(e / 2.0);
gfxCtx->NewPath();
switch(mType)
{
case NOTATION_CIRCLE:
gfxCtx->Ellipse(rect.pos + rect.size / 2.0, rect.size);
break;
case NOTATION_ROUNDEDBOX:
gfxCtx->RoundedRectangle(rect, gfxCornerSizes(3 * e), PR_TRUE);
break;
case NOTATION_UPDIAGONALSTRIKE:
gfxCtx->Line(rect.BottomLeft(), rect.TopRight());
break;
case NOTATION_DOWNDIAGONALSTRIKE:
gfxCtx->Line(rect.TopLeft(), rect.BottomRight());
break;
default:
NS_NOTREACHED("This notation can not be drawn using nsDisplayNotation");
break;
}
gfxCtx->Stroke();
// restore previous line width
gfxCtx->SetLineWidth(currentLineWidth);
}
nsresult
nsMathMLmencloseFrame::DisplayNotation(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, const nsRect& aRect,
const nsDisplayListSet& aLists,
nscoord aThickness,
nsMencloseNotation aType)
{
if (!aFrame->GetStyleVisibility()->IsVisible() || aRect.IsEmpty() ||
aThickness <= 0)
return NS_OK;
return aLists.Content()->AppendNewToTop(new (aBuilder)
nsDisplayNotation(aFrame, aRect,
aThickness,
aType));
}

158
layout/mathml/nsMathMLmencloseFrame.h Normal file
View File

@ -0,0 +1,158 @@
/* -*- 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>
* Vilya Harvey <vilya@nag.co.uk>
* Shyjan Mahamud <mahamud@cs.cmu.edu>
* Frederic Wang <fred.wang@free.fr> - extension of <msqrt/> to <menclose/>
*
* 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 nsMathMLmencloseFrame_h___
#define nsMathMLmencloseFrame_h___
#include "nsCOMPtr.h"
#include "nsMathMLContainerFrame.h"
//
// <menclose> -- enclose content with a stretching symbol such
// as a long division sign.
//
/*
The MathML REC describes:
The menclose element renders its content inside the enclosing notation
specified by its notation attribute. menclose accepts any number of arguments;
if this number is not 1, its contents are treated as a single "inferred mrow"
containing its arguments, as described in Section 3.1.3 Required Arguments.
*/
enum nsMencloseNotation
{
NOTATION_LONGDIV = 0x1,
NOTATION_RADICAL = 0x2,
NOTATION_ROUNDEDBOX = 0x4,
NOTATION_CIRCLE = 0x8,
NOTATION_LEFT = 0x10,
NOTATION_RIGHT = 0x20,
NOTATION_TOP = 0x40,
NOTATION_BOTTOM = 0x80,
NOTATION_UPDIAGONALSTRIKE = 0x100,
NOTATION_DOWNDIAGONALSTRIKE = 0x200,
NOTATION_VERTICALSTRIKE = 0x400,
NOTATION_HORIZONTALSTRIKE = 0x800
// NOTATION_MADRUWB = 0x1000
};
class nsMathMLmencloseFrame : public nsMathMLContainerFrame {
public:
friend nsIFrame* NS_NewMathMLmencloseFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext);
virtual nsresult
Place(nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize);
virtual nsresult
MeasureForWidth(nsIRenderingContext& aRenderingContext,
nsHTMLReflowMetrics& aDesiredSize);
NS_IMETHOD
AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType);
virtual void
SetAdditionalStyleContext(PRInt32 aIndex,
nsStyleContext* aStyleContext);
virtual nsStyleContext*
GetAdditionalStyleContext(PRInt32 aIndex) const;
NS_IMETHOD
Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow);
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
NS_IMETHOD
InheritAutomaticData(nsIFrame* aParent);
NS_IMETHOD
TransmitAutomaticData();
virtual nscoord
FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize);
protected:
nsMathMLmencloseFrame(nsStyleContext* aContext);
virtual ~nsMathMLmencloseFrame();
nsresult PlaceInternal(nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize,
PRBool aWidthOnly);
// functions to parse the "notation" attribute.
nsresult AddNotation(const nsAString& aNotation);
void InitNotations();
// Description of the notations to draw
PRUint32 mNotationsToDraw;
PRBool IsToDraw(nsMencloseNotation mask)
{
return mask & mNotationsToDraw;
}
nscoord mRuleThickness;
nsTArray<nsMathMLChar> mMathMLChar;
PRInt8 mLongDivCharIndex, mRadicalCharIndex;
nscoord mContentWidth;
nsresult AllocateMathMLChar(nsMencloseNotation mask);
// Display a frame of the specified type.
// @param aType Type of frame to display
nsresult DisplayNotation(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, const nsRect& aRect,
const nsDisplayListSet& aLists,
nscoord aThickness, nsMencloseNotation aType);
};
#endif /* nsMathMLmencloseFrame_h___ */

269
layout/mathml/nsMathMLmsqrtFrame.cpp
View File

@ -40,19 +40,10 @@
*
* ***** END LICENSE BLOCK ***** */
#include "nsCOMPtr.h"
#include "nsFrame.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIRenderingContext.h"
#include "nsIFontMetrics.h"
#include "nsMathMLmsqrtFrame.h"
//
// <msqrt> and <mroot> -- form a radical - implementation
// <msqrt> -- form a radical - implementation
//
//NOTE:
@ -64,11 +55,6 @@
// MathML engine. Assuming that authors have the free fonts is part of the
// deal. We are not responsible for cases of misconfigurations out there.
// additional style context to be used by our MathMLChar.
#define NS_SQR_CHAR_STYLE_CONTEXT_INDEX 0
static const PRUnichar kSqrChar = PRUnichar(0x221A);
nsIFrame*
NS_NewMathMLmsqrtFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
@ -76,9 +62,7 @@ NS_NewMathMLmsqrtFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
}
nsMathMLmsqrtFrame::nsMathMLmsqrtFrame(nsStyleContext* aContext) :
nsMathMLContainerFrame(aContext),
mSqrChar(),
mBarRect()
nsMathMLmencloseFrame(aContext)
{
}
@ -92,252 +76,17 @@ nsMathMLmsqrtFrame::Init(nsIContent* aContent,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsMathMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
nsPresContext *presContext = PresContext();
// No need to tract the style context given to our MathML char.
// The Style System will use Get/SetAdditionalStyleContext() to keep it
// up-to-date if dynamic changes arise.
nsAutoString sqrChar; sqrChar.Assign(kSqrChar);
mSqrChar.SetData(presContext, sqrChar);
ResolveMathMLCharStyle(presContext, mContent, mStyleContext, &mSqrChar, PR_TRUE);
AllocateMathMLChar(NOTATION_RADICAL);
mNotationsToDraw |= NOTATION_RADICAL;
return rv;
}
NS_IMETHODIMP
nsMathMLmsqrtFrame::InheritAutomaticData(nsIFrame* aParent)
nsMathMLmsqrtFrame::AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType)
{
// let the base class get the default from our parent
nsMathMLContainerFrame::InheritAutomaticData(aParent);
mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
return NS_OK;
}
NS_IMETHODIMP
nsMathMLmsqrtFrame::TransmitAutomaticData()
{
// 1. The REC says:
// The <msqrt> element leaves both attributes [displaystyle and scriptlevel]
// unchanged within all its arguments.
// 2. The TeXBook (Ch 17. p.141) says that \sqrt is cramped
UpdatePresentationDataFromChildAt(0, -1,
NS_MATHML_COMPRESSED,
NS_MATHML_COMPRESSED);
return NS_OK;
}
NS_IMETHODIMP
nsMathMLmsqrtFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
/////////////
// paint the content we are square-rooting
nsresult rv = nsMathMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
NS_ENSURE_SUCCESS(rv, rv);
/////////////
// paint the sqrt symbol
if (!NS_MATHML_HAS_ERROR(mPresentationData.flags)) {
rv = mSqrChar.Display(aBuilder, this, aLists);
NS_ENSURE_SUCCESS(rv, rv);
rv = DisplayBar(aBuilder, this, mBarRect, aLists);
NS_ENSURE_SUCCESS(rv, rv);
#if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
// for visual debug
nsRect rect;
mSqrChar.GetRect(rect);
nsBoundingMetrics bm;
mSqrChar.GetBoundingMetrics(bm);
rv = DisplayBoundingMetrics(aBuilder, this, rect.TopLeft(), bm, aLists);
#endif
}
return rv;
}
/* virtual */ nsresult
nsMathMLmsqrtFrame::Place(nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
{
///////////////
// Measure the size of our content using the base class to format like an
// inferred mrow.
nsHTMLReflowMetrics baseSize;
nsresult rv =
nsMathMLContainerFrame::Place(aRenderingContext, PR_FALSE, baseSize);
if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
DidReflowChildren(GetFirstChild(nsnull));
return rv;
}
nsBoundingMetrics bmSqr, bmBase;
bmBase = baseSize.mBoundingMetrics;
////////////
// Prepare the radical symbol and the overline bar
aRenderingContext.SetFont(GetStyleFont()->mFont, nsnull,
PresContext()->GetUserFontSet());
nsCOMPtr<nsIFontMetrics> fm;
aRenderingContext.GetFontMetrics(*getter_AddRefs(fm));
// For radical glyphs from TeX fonts and some of the radical glyphs from
// Mathematica fonts, the thickness of the overline can be obtained from the
// ascent of the glyph. Most fonts however have radical glyphs above the
// baseline so no assumption can be made about the meaning of the ascent.
nscoord ruleThickness, leading, em;
GetRuleThickness(aRenderingContext, fm, ruleThickness);
nsBoundingMetrics bmOne;
aRenderingContext.GetBoundingMetrics(NS_LITERAL_STRING("1").get(), 1, bmOne);
// get the leading to be left at the top of the resulting frame
// this seems more reliable than using fm->GetLeading() on suspicious fonts
GetEmHeight(fm, em);
leading = nscoord(0.2f * em);
// Rule 11, App. G, TeXbook
// psi = clearance between rule and content
nscoord phi = 0, psi = 0;
if (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags))
fm->GetXHeight(phi);
else
phi = ruleThickness;
psi = ruleThickness + phi/4;
// built-in: adjust clearance psi to emulate \mathstrut using '1' (TexBook, p.131)
if (bmOne.ascent > bmBase.ascent)
psi += bmOne.ascent - bmBase.ascent;
// make sure that the rule appears on the screen
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
if (ruleThickness < onePixel) {
ruleThickness = onePixel;
}
// adjust clearance psi to get an exact number of pixels -- this
// gives a nicer & uniform look on stacked radicals (bug 130282)
nscoord delta = psi % onePixel;
if (delta)
psi += onePixel - delta; // round up
// Stretch the radical symbol to the appropriate height if it is not big enough.
nsBoundingMetrics contSize = bmBase;
contSize.ascent = ruleThickness;
contSize.descent = bmBase.ascent + bmBase.descent + psi;
// height(radical) should be >= height(base) + psi + ruleThickness
nsBoundingMetrics radicalSize;
mSqrChar.Stretch(PresContext(), aRenderingContext,
NS_STRETCH_DIRECTION_VERTICAL,
contSize, radicalSize,
NS_STRETCH_LARGER);
// radicalSize have changed at this point, and should match with
// the bounding metrics of the char
mSqrChar.GetBoundingMetrics(bmSqr);
nscoord dx = 0, dy = 0;
// place the radical symbol and the radical bar
dy = leading; // leave a leading at the top
mSqrChar.SetRect(nsRect(dx, dy, bmSqr.width, bmSqr.ascent + bmSqr.descent));
dx = bmSqr.width;
mBarRect.SetRect(dx, dy, bmBase.width, ruleThickness);
// Update the desired size for the container.
// the baseline will be that of the base.
mBoundingMetrics.ascent = bmBase.ascent + psi + ruleThickness;
mBoundingMetrics.descent =
PR_MAX(bmBase.descent,
(bmSqr.ascent + bmSqr.descent - mBoundingMetrics.ascent));
mBoundingMetrics.width = bmSqr.width + bmBase.width;
mBoundingMetrics.leftBearing = bmSqr.leftBearing;
mBoundingMetrics.rightBearing = bmSqr.width +
PR_MAX(bmBase.width, bmBase.rightBearing); // take also care of the rule
aDesiredSize.ascent = mBoundingMetrics.ascent + leading;
aDesiredSize.height = aDesiredSize.ascent +
PR_MAX(baseSize.height - baseSize.ascent,
mBoundingMetrics.descent + ruleThickness);
aDesiredSize.width = mBoundingMetrics.width;
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
mReference.x = 0;
mReference.y = aDesiredSize.ascent;
if (aPlaceOrigin) {
//////////////////
// Finish reflowing child frames, positioning their origins so as to leave
// room for the sqrt char and the overline bar.
PositionRowChildFrames(radicalSize.width, aDesiredSize.ascent);
}
return NS_OK;
}
/* virtual */ nscoord
nsMathMLmsqrtFrame::GetIntrinsicWidth(nsIRenderingContext* aRenderingContext)
{
// The child frames form an mrow
nscoord width = nsMathMLContainerFrame::GetIntrinsicWidth(aRenderingContext);
// Add the width of the radical symbol
width += mSqrChar.GetMaxWidth(PresContext(), *aRenderingContext);
return width;
}
/* virtual */ nsresult
nsMathMLmsqrtFrame::MeasureChildFrames(nsIRenderingContext& aRenderingContext,
nsHTMLReflowMetrics& aDesiredSize)
{
return nsMathMLContainerFrame::Place(aRenderingContext, PR_FALSE,
aDesiredSize);
}
nscoord
nsMathMLmsqrtFrame::FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize)
{
nscoord gap = nsMathMLContainerFrame::FixInterFrameSpacing(aDesiredSize);
if (!gap) return 0;
nsRect rect;
mSqrChar.GetRect(rect);
rect.MoveBy(gap, 0);
mSqrChar.SetRect(rect);
mBarRect.MoveBy(gap, 0);
return gap;
}
// ----------------------
// the Style System will use these to pass the proper style context to our MathMLChar
nsStyleContext*
nsMathMLmsqrtFrame::GetAdditionalStyleContext(PRInt32 aIndex) const
{
switch (aIndex) {
case NS_SQR_CHAR_STYLE_CONTEXT_INDEX:
return mSqrChar.GetStyleContext();
break;
default:
return nsnull;
}
}
void
nsMathMLmsqrtFrame::SetAdditionalStyleContext(PRInt32 aIndex,
nsStyleContext* aStyleContext)
{
switch (aIndex) {
case NS_SQR_CHAR_STYLE_CONTEXT_INDEX:
mSqrChar.SetStyleContext(aStyleContext);
break;
}
return nsMathMLContainerFrame::
AttributeChanged(aNameSpaceID, aAttribute, aModType);
}

55
layout/mathml/nsMathMLmsqrtFrame.h
View File

@ -42,11 +42,10 @@
#ifndef nsMathMLmsqrtFrame_h___
#define nsMathMLmsqrtFrame_h___
#include "nsCOMPtr.h"
#include "nsMathMLContainerFrame.h"
#include "nsMathMLmencloseFrame.h"
//
// <msqrt> -- form a fraction from two subexpressions
// <msqrt> -- form a radical
//
/*
@ -68,62 +67,24 @@ These attributes are inherited by every element from its rendering environment,
but can be set explicitly only on <mstyle>. (See Section 3.3.4.)
*/
/*
TODO:
*/
class nsMathMLmsqrtFrame : public nsMathMLContainerFrame {
class nsMathMLmsqrtFrame : public nsMathMLmencloseFrame {
public:
friend nsIFrame* NS_NewMathMLmsqrtFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
virtual void
SetAdditionalStyleContext(PRInt32 aIndex,
nsStyleContext* aStyleContext);
virtual nsStyleContext*
GetAdditionalStyleContext(PRInt32 aIndex) const;
friend nsIFrame* NS_NewMathMLmsqrtFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext);
NS_IMETHOD
Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow);
virtual nsresult
Place(nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize);
virtual nscoord
GetIntrinsicWidth(nsIRenderingContext* aRenderingContext);
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
NS_IMETHOD
InheritAutomaticData(nsIFrame* aParent);
NS_IMETHOD
TransmitAutomaticData();
// the base method doesn't deal fully with <msqrt> because it only
// slides child frames and has no idea that we have a sqrt glyph that
// is part of the flow without being a frame. We need to shift our
// sqrt glyph too.
virtual nscoord
FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize);
AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType);
protected:
nsMathMLmsqrtFrame(nsStyleContext* aContext);
virtual ~nsMathMLmsqrtFrame();
virtual PRIntn GetSkipSides() const { return 0; }
virtual nsresult
MeasureChildFrames(nsIRenderingContext& aRenderingContext,
nsHTMLReflowMetrics& aDesiredSize);
nsMathMLChar mSqrChar;
nsRect mBarRect;
};
#endif /* nsMathMLmsqrtFrame_h___ */