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gecko/layout/mathml/nsMathMLmencloseFrame.cpp

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/* -*- 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);
}
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmencloseFrame)
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 = NS_MAX(bmOne.ascent, bmBase.ascent);
bmBase.descent = NS_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(2.0) - 1.0) / 2.0;
nscoord padding2;
// Update horizontal parameters
padding2 = ratio * bmBase.width;
dx_left = NS_MAX(dx_left, padding2);
dx_right = NS_MAX(dx_right, padding2);
// Update vertical parameters
padding2 = ratio * (bmBase.ascent + bmBase.descent);
mBoundingMetrics.ascent = NS_MAX(mBoundingMetrics.ascent,
bmBase.ascent + padding2);
mBoundingMetrics.descent = NS_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 = NS_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 = NS_MAX(dx_left, bmLongdivChar.width);
// Update vertical parameters
longdivAscent = bmBase.ascent + psi + mRuleThickness;
longdivDescent = NS_MAX(bmBase.descent,
(bmLongdivChar.ascent + bmLongdivChar.descent -
longdivAscent));
mBoundingMetrics.ascent = NS_MAX(mBoundingMetrics.ascent,
longdivAscent);
mBoundingMetrics.descent = NS_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 = NS_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 = NS_MAX(dx_left, bmRadicalChar.width);
// Update vertical parameters
radicalAscent = bmBase.ascent + psi + mRuleThickness;
radicalDescent = NS_MAX(bmBase.descent,
(bmRadicalChar.ascent + bmRadicalChar.descent -
radicalAscent));
mBoundingMetrics.ascent = NS_MAX(mBoundingMetrics.ascent,
radicalAscent);
mBoundingMetrics.descent = NS_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 = NS_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 = NS_MIN(0, dx_left + bmBase.leftBearing);
mBoundingMetrics.rightBearing =
NS_MAX(mBoundingMetrics.width, dx_left + bmBase.rightBearing);
aDesiredSize.width = mBoundingMetrics.width;
aDesiredSize.ascent = NS_MAX(mBoundingMetrics.ascent, baseSize.ascent);
aDesiredSize.height = aDesiredSize.ascent +
NS_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 = NS_MAX(desiredSizeAscent,
longdivAscent + leading);
desiredSizeDescent = NS_MAX(desiredSizeDescent,
longdivDescent + mRuleThickness);
}
if (IsToDraw(NOTATION_RADICAL)) {
desiredSizeAscent = NS_MAX(desiredSizeAscent,
radicalAscent + leading);
desiredSizeDescent = NS_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 = NS_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);
NS_DISPLAY_DECL_NAME("MathMLMencloseNotation")
private:
nsRect mRect;
nscoord mThickness;
nsMencloseNotation mType;
};
void nsDisplayNotation::Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx)
{
// 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));
}
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