mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-05 12:05:22 +00:00
641 lines
23 KiB
C++
641 lines
23 KiB
C++
/* -*- 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>
|
|
* Frederic Wang <fred.wang@free.fr>
|
|
*
|
|
* 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 "nsMathMLmfracFrame.h"
|
|
#include "nsDisplayList.h"
|
|
#include "gfxContext.h"
|
|
|
|
//
|
|
// <mfrac> -- form a fraction from two subexpressions - implementation
|
|
//
|
|
|
|
// various fraction line thicknesses (multiplicative values of the default rule thickness)
|
|
|
|
#define THIN_FRACTION_LINE 0.5f
|
|
#define THIN_FRACTION_LINE_MINIMUM_PIXELS 1 // minimum of 1 pixel
|
|
|
|
#define MEDIUM_FRACTION_LINE 1.5f
|
|
#define MEDIUM_FRACTION_LINE_MINIMUM_PIXELS 2 // minimum of 2 pixels
|
|
|
|
#define THICK_FRACTION_LINE 2.0f
|
|
#define THICK_FRACTION_LINE_MINIMUM_PIXELS 4 // minimum of 4 pixels
|
|
|
|
nsIFrame*
|
|
NS_NewMathMLmfracFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
|
|
{
|
|
return new (aPresShell) nsMathMLmfracFrame(aContext);
|
|
}
|
|
|
|
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmfracFrame)
|
|
|
|
nsMathMLmfracFrame::~nsMathMLmfracFrame()
|
|
{
|
|
}
|
|
|
|
PRBool
|
|
nsMathMLmfracFrame::IsBevelled()
|
|
{
|
|
nsAutoString value;
|
|
GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::bevelled_,
|
|
value);
|
|
return value.EqualsLiteral("true");
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLmfracFrame::Init(nsIContent* aContent,
|
|
nsIFrame* aParent,
|
|
nsIFrame* aPrevInFlow)
|
|
{
|
|
nsresult rv = nsMathMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
|
|
|
|
mIsBevelled = IsBevelled();
|
|
|
|
return rv;
|
|
}
|
|
|
|
eMathMLFrameType
|
|
nsMathMLmfracFrame::GetMathMLFrameType()
|
|
{
|
|
// frac is "inner" in TeXBook, Appendix G, rule 15e. See also page 170.
|
|
return eMathMLFrameType_Inner;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLmfracFrame::TransmitAutomaticData()
|
|
{
|
|
// 1. The REC says:
|
|
// The <mfrac> element sets displaystyle to "false", or if it was already
|
|
// false increments scriptlevel by 1, within numerator and denominator.
|
|
// 2. The TeXbook (Ch 17. p.141) says the numerator inherits the compression
|
|
// while the denominator is compressed
|
|
PRBool increment = !NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags);
|
|
SetIncrementScriptLevel(0, increment);
|
|
SetIncrementScriptLevel(1, increment);
|
|
|
|
UpdatePresentationDataFromChildAt(0, -1,
|
|
~NS_MATHML_DISPLAYSTYLE,
|
|
NS_MATHML_DISPLAYSTYLE);
|
|
UpdatePresentationDataFromChildAt(1, 1,
|
|
NS_MATHML_COMPRESSED,
|
|
NS_MATHML_COMPRESSED);
|
|
|
|
// if our numerator is an embellished operator, let its state bubble to us
|
|
GetEmbellishDataFrom(mFrames.FirstChild(), mEmbellishData);
|
|
if (NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags)) {
|
|
// even when embellished, we need to record that <mfrac> won't fire
|
|
// Stretch() on its embellished child
|
|
mEmbellishData.direction = NS_STRETCH_DIRECTION_UNSUPPORTED;
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
nscoord
|
|
nsMathMLmfracFrame::CalcLineThickness(nsPresContext* aPresContext,
|
|
nsStyleContext* aStyleContext,
|
|
nsString& aThicknessAttribute,
|
|
nscoord onePixel,
|
|
nscoord aDefaultRuleThickness)
|
|
{
|
|
nscoord defaultThickness = aDefaultRuleThickness;
|
|
nscoord lineThickness = aDefaultRuleThickness;
|
|
nscoord minimumThickness = onePixel;
|
|
|
|
if (!aThicknessAttribute.IsEmpty()) {
|
|
if (aThicknessAttribute.EqualsLiteral("thin")) {
|
|
lineThickness = NSToCoordFloor(defaultThickness * THIN_FRACTION_LINE);
|
|
minimumThickness = onePixel * THIN_FRACTION_LINE_MINIMUM_PIXELS;
|
|
// should visually decrease by at least one pixel, if default is not a pixel
|
|
if (defaultThickness > onePixel && lineThickness > defaultThickness - onePixel)
|
|
lineThickness = defaultThickness - onePixel;
|
|
}
|
|
else if (aThicknessAttribute.EqualsLiteral("medium")) {
|
|
lineThickness = NSToCoordRound(defaultThickness * MEDIUM_FRACTION_LINE);
|
|
minimumThickness = onePixel * MEDIUM_FRACTION_LINE_MINIMUM_PIXELS;
|
|
// should visually increase by at least one pixel
|
|
if (lineThickness < defaultThickness + onePixel)
|
|
lineThickness = defaultThickness + onePixel;
|
|
}
|
|
else if (aThicknessAttribute.EqualsLiteral("thick")) {
|
|
lineThickness = NSToCoordCeil(defaultThickness * THICK_FRACTION_LINE);
|
|
minimumThickness = onePixel * THICK_FRACTION_LINE_MINIMUM_PIXELS;
|
|
// should visually increase by at least two pixels
|
|
if (lineThickness < defaultThickness + 2*onePixel)
|
|
lineThickness = defaultThickness + 2*onePixel;
|
|
}
|
|
else { // see if it is a plain number, or a percentage, or a h/v-unit like 1ex, 2px, 1em
|
|
nsCSSValue cssValue;
|
|
if (ParseNumericValue(aThicknessAttribute, cssValue)) {
|
|
nsCSSUnit unit = cssValue.GetUnit();
|
|
if (eCSSUnit_Number == unit)
|
|
lineThickness = nscoord(float(defaultThickness) * cssValue.GetFloatValue());
|
|
else if (eCSSUnit_Percent == unit)
|
|
lineThickness = nscoord(float(defaultThickness) * cssValue.GetPercentValue());
|
|
else if (eCSSUnit_Null != unit)
|
|
lineThickness = CalcLength(aPresContext, aStyleContext, cssValue);
|
|
}
|
|
}
|
|
}
|
|
|
|
// use minimum if the lineThickness is a non-zero value less than minimun
|
|
if (lineThickness && lineThickness < minimumThickness)
|
|
lineThickness = minimumThickness;
|
|
|
|
return lineThickness;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLmfracFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsRect& aDirtyRect,
|
|
const nsDisplayListSet& aLists)
|
|
{
|
|
/////////////
|
|
// paint the numerator and denominator
|
|
nsresult rv = nsMathMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
/////////////
|
|
// paint the fraction line
|
|
if (mIsBevelled) {
|
|
rv = DisplaySlash(aBuilder, this, mLineRect, mLineThickness, aLists);
|
|
} else {
|
|
rv = DisplayBar(aBuilder, this, mLineRect, aLists);
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
/* virtual */ nsresult
|
|
nsMathMLmfracFrame::MeasureForWidth(nsIRenderingContext& aRenderingContext,
|
|
nsHTMLReflowMetrics& aDesiredSize)
|
|
{
|
|
return PlaceInternal(aRenderingContext,
|
|
PR_FALSE,
|
|
aDesiredSize,
|
|
PR_TRUE);
|
|
}
|
|
|
|
nscoord
|
|
nsMathMLmfracFrame::FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize)
|
|
{
|
|
nscoord gap = nsMathMLContainerFrame::FixInterFrameSpacing(aDesiredSize);
|
|
if (!gap) return 0;
|
|
|
|
mLineRect.MoveBy(gap, 0);
|
|
return gap;
|
|
}
|
|
|
|
/* virtual */ nsresult
|
|
nsMathMLmfracFrame::Place(nsIRenderingContext& aRenderingContext,
|
|
PRBool aPlaceOrigin,
|
|
nsHTMLReflowMetrics& aDesiredSize)
|
|
{
|
|
return PlaceInternal(aRenderingContext,
|
|
aPlaceOrigin,
|
|
aDesiredSize,
|
|
PR_FALSE);
|
|
}
|
|
|
|
nsresult
|
|
nsMathMLmfracFrame::PlaceInternal(nsIRenderingContext& aRenderingContext,
|
|
PRBool aPlaceOrigin,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
PRBool aWidthOnly)
|
|
{
|
|
////////////////////////////////////
|
|
// Get the children's desired sizes
|
|
nsBoundingMetrics bmNum, bmDen;
|
|
nsHTMLReflowMetrics sizeNum;
|
|
nsHTMLReflowMetrics sizeDen;
|
|
nsIFrame* frameDen = nsnull;
|
|
nsIFrame* frameNum = mFrames.FirstChild();
|
|
if (frameNum)
|
|
frameDen = frameNum->GetNextSibling();
|
|
if (!frameNum || !frameDen || frameDen->GetNextSibling()) {
|
|
// report an error, encourage people to get their markups in order
|
|
return ReflowError(aRenderingContext, aDesiredSize);
|
|
}
|
|
GetReflowAndBoundingMetricsFor(frameNum, sizeNum, bmNum);
|
|
GetReflowAndBoundingMetricsFor(frameDen, sizeDen, bmDen);
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
|
|
|
|
aRenderingContext.SetFont(GetStyleFont()->mFont, nsnull,
|
|
presContext->GetUserFontSet());
|
|
nsCOMPtr<nsIFontMetrics> fm;
|
|
aRenderingContext.GetFontMetrics(*getter_AddRefs(fm));
|
|
|
|
nscoord defaultRuleThickness, axisHeight;
|
|
GetRuleThickness(aRenderingContext, fm, defaultRuleThickness);
|
|
GetAxisHeight(aRenderingContext, fm, axisHeight);
|
|
|
|
nsEmbellishData coreData;
|
|
GetEmbellishDataFrom(mEmbellishData.coreFrame, coreData);
|
|
|
|
// see if the linethickness attribute is there
|
|
nsAutoString value;
|
|
GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::linethickness_,
|
|
value);
|
|
|
|
mLineThickness = CalcLineThickness(presContext, mStyleContext, value,
|
|
onePixel, defaultRuleThickness);
|
|
|
|
if (!mIsBevelled) {
|
|
mLineRect.height = mLineThickness;
|
|
|
|
// by default, leave at least one-pixel padding at either end, or use
|
|
// lspace & rspace that may come from <mo> if we are an embellished
|
|
// container (we fetch values from the core since they may use units that
|
|
// depend on style data, and style changes could have occurred in the
|
|
// core since our last visit there)
|
|
nscoord leftSpace = NS_MAX(onePixel, coreData.leftSpace);
|
|
nscoord rightSpace = NS_MAX(onePixel, coreData.rightSpace);
|
|
|
|
//////////////////
|
|
// Get shifts
|
|
nscoord numShift = 0;
|
|
nscoord denShift = 0;
|
|
|
|
// Rule 15b, App. G, TeXbook
|
|
nscoord numShift1, numShift2, numShift3;
|
|
nscoord denShift1, denShift2;
|
|
|
|
GetNumeratorShifts(fm, numShift1, numShift2, numShift3);
|
|
GetDenominatorShifts(fm, denShift1, denShift2);
|
|
if (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
|
|
// C > T
|
|
numShift = numShift1;
|
|
denShift = denShift1;
|
|
}
|
|
else {
|
|
numShift = (0 < mLineRect.height) ? numShift2 : numShift3;
|
|
denShift = denShift2;
|
|
}
|
|
|
|
nscoord minClearance = 0;
|
|
nscoord actualClearance = 0;
|
|
|
|
nscoord actualRuleThickness = mLineThickness;
|
|
|
|
if (0 == actualRuleThickness) {
|
|
// Rule 15c, App. G, TeXbook
|
|
|
|
// min clearance between numerator and denominator
|
|
minClearance = (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) ?
|
|
7 * defaultRuleThickness : 3 * defaultRuleThickness;
|
|
actualClearance =
|
|
(numShift - bmNum.descent) - (bmDen.ascent - denShift);
|
|
// actualClearance should be >= minClearance
|
|
if (actualClearance < minClearance) {
|
|
nscoord halfGap = (minClearance - actualClearance)/2;
|
|
numShift += halfGap;
|
|
denShift += halfGap;
|
|
}
|
|
}
|
|
else {
|
|
// Rule 15d, App. G, TeXbook
|
|
|
|
// min clearance between numerator or denominator and middle of bar
|
|
|
|
// TeX has a different interpretation of the thickness.
|
|
// Try $a \above10pt b$ to see. Here is what TeX does:
|
|
// minClearance = (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) ?
|
|
// 3 * actualRuleThickness : actualRuleThickness;
|
|
|
|
// we slightly depart from TeX here. We use the defaultRuleThickness instead
|
|
// of the value coming from the linethickness attribute, i.e., we recover what
|
|
// TeX does if the user hasn't set linethickness. But when the linethickness
|
|
// is set, we avoid the wide gap problem.
|
|
minClearance = (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) ?
|
|
3 * defaultRuleThickness : defaultRuleThickness + onePixel;
|
|
|
|
// adjust numShift to maintain minClearance if needed
|
|
actualClearance =
|
|
(numShift - bmNum.descent) - (axisHeight + actualRuleThickness/2);
|
|
if (actualClearance < minClearance) {
|
|
numShift += (minClearance - actualClearance);
|
|
}
|
|
// adjust denShift to maintain minClearance if needed
|
|
actualClearance =
|
|
(axisHeight - actualRuleThickness/2) - (bmDen.ascent - denShift);
|
|
if (actualClearance < minClearance) {
|
|
denShift += (minClearance - actualClearance);
|
|
}
|
|
}
|
|
|
|
//////////////////
|
|
// Place Children
|
|
|
|
// XXX Need revisiting the width. TeX uses the exact width
|
|
// e.g. in $$\huge\frac{\displaystyle\int}{i}$$
|
|
nscoord width = NS_MAX(bmNum.width, bmDen.width);
|
|
nscoord dxNum = leftSpace + (width - sizeNum.width)/2;
|
|
nscoord dxDen = leftSpace + (width - sizeDen.width)/2;
|
|
width += leftSpace + rightSpace;
|
|
|
|
// see if the numalign attribute is there
|
|
GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::numalign_,
|
|
value);
|
|
if (value.EqualsLiteral("left"))
|
|
dxNum = leftSpace;
|
|
else if (value.EqualsLiteral("right"))
|
|
dxNum = width - rightSpace - sizeNum.width;
|
|
|
|
// see if the denomalign attribute is there
|
|
GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::denomalign_,
|
|
value);
|
|
if (value.EqualsLiteral("left"))
|
|
dxDen = leftSpace;
|
|
else if (value.EqualsLiteral("right"))
|
|
dxDen = width - rightSpace - sizeDen.width;
|
|
|
|
mBoundingMetrics.rightBearing =
|
|
NS_MAX(dxNum + bmNum.rightBearing, dxDen + bmDen.rightBearing);
|
|
if (mBoundingMetrics.rightBearing < width - rightSpace)
|
|
mBoundingMetrics.rightBearing = width - rightSpace;
|
|
mBoundingMetrics.leftBearing =
|
|
NS_MIN(dxNum + bmNum.leftBearing, dxDen + bmDen.leftBearing);
|
|
if (mBoundingMetrics.leftBearing > leftSpace)
|
|
mBoundingMetrics.leftBearing = leftSpace;
|
|
mBoundingMetrics.ascent = bmNum.ascent + numShift;
|
|
mBoundingMetrics.descent = bmDen.descent + denShift;
|
|
mBoundingMetrics.width = width;
|
|
|
|
aDesiredSize.ascent = sizeNum.ascent + numShift;
|
|
aDesiredSize.height = aDesiredSize.ascent +
|
|
sizeDen.height - sizeDen.ascent + denShift;
|
|
aDesiredSize.width = mBoundingMetrics.width;
|
|
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
|
|
|
|
mReference.x = 0;
|
|
mReference.y = aDesiredSize.ascent;
|
|
|
|
if (aPlaceOrigin) {
|
|
nscoord dy;
|
|
// place numerator
|
|
dy = 0;
|
|
FinishReflowChild(frameNum, presContext, nsnull, sizeNum, dxNum, dy, 0);
|
|
// place denominator
|
|
dy = aDesiredSize.height - sizeDen.height;
|
|
FinishReflowChild(frameDen, presContext, nsnull, sizeDen, dxDen, dy, 0);
|
|
// place the fraction bar - dy is top of bar
|
|
dy = aDesiredSize.ascent - (axisHeight + actualRuleThickness/2);
|
|
mLineRect.SetRect(leftSpace, dy, width - (leftSpace + rightSpace),
|
|
actualRuleThickness);
|
|
}
|
|
} else {
|
|
nscoord numShift = 0.0;
|
|
nscoord denShift = 0.0;
|
|
nscoord padding = 3 * defaultRuleThickness;
|
|
nscoord slashRatio = 3;
|
|
|
|
// Define the constant used in the expression of the maximum width
|
|
nscoord em;
|
|
fm->GetEmHeight(em);
|
|
nscoord slashMaxWidthConstant = 2 * em;
|
|
|
|
// For large line thicknesses the minimum slash height is limited to the
|
|
// largest expected height of a fraction
|
|
nscoord slashMinHeight = slashRatio *
|
|
NS_MIN(2 * mLineThickness, slashMaxWidthConstant);
|
|
|
|
nscoord leftSpace = NS_MAX(padding, coreData.leftSpace);
|
|
nscoord rightSpace = NS_MAX(padding, coreData.rightSpace);
|
|
nscoord delta;
|
|
|
|
// ___________
|
|
// | | /
|
|
// {|-NUMERATOR-| /
|
|
// {|___________| S
|
|
// { L
|
|
// numShift{ A
|
|
// ------------------------------------------------------- baseline
|
|
// S _____________ } denShift
|
|
// H | |}
|
|
// / |-DENOMINATOR-|}
|
|
// / |_____________|
|
|
//
|
|
|
|
// first, ensure that the top of the numerator is at least as high as the
|
|
// top of the denominator (and the reverse for the bottoms)
|
|
delta = NS_MAX(bmDen.ascent - bmNum.ascent,
|
|
bmNum.descent - bmDen.descent) / 2;
|
|
if (delta > 0) {
|
|
numShift += delta;
|
|
denShift += delta;
|
|
}
|
|
|
|
if (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
|
|
delta = NS_MIN(bmDen.ascent + bmDen.descent,
|
|
bmNum.ascent + bmNum.descent) / 2;
|
|
numShift += delta;
|
|
denShift += delta;
|
|
} else {
|
|
nscoord xHeight = 0;
|
|
fm->GetXHeight (xHeight);
|
|
numShift += xHeight / 2;
|
|
denShift += xHeight / 4;
|
|
}
|
|
|
|
// Set the ascent/descent of our BoundingMetrics.
|
|
mBoundingMetrics.ascent = bmNum.ascent + numShift;
|
|
mBoundingMetrics.descent = bmDen.descent + denShift;
|
|
|
|
// At this point the height of the slash is
|
|
// mBoundingMetrics.ascent + mBoundingMetrics.descent
|
|
// Ensure that it is greater than slashMinHeight
|
|
delta = (slashMinHeight -
|
|
(mBoundingMetrics.ascent + mBoundingMetrics.descent)) / 2;
|
|
if (delta > 0) {
|
|
mBoundingMetrics.ascent += delta;
|
|
mBoundingMetrics.descent += delta;
|
|
}
|
|
|
|
// Set the width of the slash
|
|
if (aWidthOnly) {
|
|
mLineRect.width = mLineThickness + slashMaxWidthConstant;
|
|
} else {
|
|
mLineRect.width = mLineThickness +
|
|
NS_MIN(slashMaxWidthConstant,
|
|
(mBoundingMetrics.ascent + mBoundingMetrics.descent) /
|
|
slashRatio);
|
|
}
|
|
|
|
// Set horizontal bounding metrics
|
|
mBoundingMetrics.leftBearing = leftSpace + bmNum.leftBearing;
|
|
mBoundingMetrics.rightBearing =
|
|
leftSpace + bmNum.width + mLineRect.width + bmDen.rightBearing;
|
|
mBoundingMetrics.width =
|
|
leftSpace + bmNum.width + mLineRect.width + bmDen.width + rightSpace;
|
|
|
|
// Set aDesiredSize
|
|
aDesiredSize.ascent = mBoundingMetrics.ascent + padding;
|
|
aDesiredSize.height =
|
|
mBoundingMetrics.ascent + mBoundingMetrics.descent + 2 * padding;
|
|
aDesiredSize.width = mBoundingMetrics.width;
|
|
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
|
|
|
|
mReference.x = 0;
|
|
mReference.y = aDesiredSize.ascent;
|
|
|
|
if (aPlaceOrigin) {
|
|
FinishReflowChild(frameNum, presContext, nsnull, sizeNum,
|
|
leftSpace,
|
|
aDesiredSize.ascent - numShift - sizeNum.ascent, 0);
|
|
|
|
mLineRect.SetRect(leftSpace + bmNum.width,
|
|
aDesiredSize.ascent - mBoundingMetrics.ascent,
|
|
mLineRect.width,
|
|
aDesiredSize.height - 2 * padding);
|
|
|
|
FinishReflowChild(frameDen, presContext, nsnull, sizeDen,
|
|
leftSpace + bmNum.width + mLineRect.width,
|
|
aDesiredSize.ascent + denShift - sizeDen.ascent, 0);
|
|
}
|
|
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLmfracFrame::AttributeChanged(PRInt32 aNameSpaceID,
|
|
nsIAtom* aAttribute,
|
|
PRInt32 aModType)
|
|
{
|
|
if (nsGkAtoms::bevelled_ == aAttribute) {
|
|
mIsBevelled = IsBevelled();
|
|
}
|
|
return nsMathMLContainerFrame::
|
|
AttributeChanged(aNameSpaceID, aAttribute, aModType);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLmfracFrame::UpdatePresentationDataFromChildAt(PRInt32 aFirstIndex,
|
|
PRInt32 aLastIndex,
|
|
PRUint32 aFlagsValues,
|
|
PRUint32 aFlagsToUpdate)
|
|
{
|
|
// The REC says "The <mfrac> element sets displaystyle to "false" within
|
|
// numerator and denominator"
|
|
#if 0
|
|
// At one point I thought that it meant that the displaystyle state of
|
|
// the numerator and denominator cannot be modified by an ancestor, i.e.,
|
|
// to change the displaystyle, one has to use displaystyle="true" with mstyle:
|
|
// <mfrac> <mstyle>numerator</mstyle> <mstyle>denominator</mstyle> </mfrac>
|
|
|
|
// Commenting out for now until it is clear what the intention really is.
|
|
// See also the variants for <mover>, <munder>, <munderover>
|
|
|
|
aFlagsToUpdate &= ~NS_MATHML_DISPLAYSTYLE;
|
|
aFlagsValues &= ~NS_MATHML_DISPLAYSTYLE;
|
|
#endif
|
|
return nsMathMLContainerFrame::
|
|
UpdatePresentationDataFromChildAt(aFirstIndex, aLastIndex,
|
|
aFlagsValues, aFlagsToUpdate);
|
|
}
|
|
|
|
class nsDisplayMathMLSlash : public nsDisplayItem {
|
|
public:
|
|
nsDisplayMathMLSlash(nsIFrame* aFrame, const nsRect& aRect,
|
|
nscoord aThickness)
|
|
: nsDisplayItem(aFrame), mRect(aRect), mThickness(aThickness) {
|
|
MOZ_COUNT_CTOR(nsDisplayMathMLSlash);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayMathMLSlash() {
|
|
MOZ_COUNT_DTOR(nsDisplayMathMLSlash);
|
|
}
|
|
#endif
|
|
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx);
|
|
NS_DISPLAY_DECL_NAME("MathMLSlash")
|
|
private:
|
|
nsRect mRect;
|
|
nscoord mThickness;
|
|
};
|
|
|
|
void nsDisplayMathMLSlash::Paint(nsDisplayListBuilder* aBuilder,
|
|
nsIRenderingContext* aCtx)
|
|
{
|
|
// get the gfxRect
|
|
nsPresContext* presContext = mFrame->PresContext();
|
|
gfxRect rect = presContext->
|
|
AppUnitsToGfxUnits(mRect + aBuilder->ToReferenceFrame(mFrame));
|
|
|
|
// paint with the current text color
|
|
aCtx->SetColor(mFrame->GetStyleColor()->mColor);
|
|
|
|
// draw the slash as a parallelogram
|
|
gfxContext *gfxCtx = aCtx->ThebesContext();
|
|
gfxSize delta = gfxSize(presContext->AppUnitsToGfxUnits(mThickness), 0);
|
|
gfxCtx->NewPath();
|
|
gfxCtx->MoveTo(rect.BottomLeft());
|
|
gfxCtx->LineTo(rect.BottomLeft() + delta);
|
|
gfxCtx->LineTo(rect.TopRight());
|
|
gfxCtx->LineTo(rect.TopRight() - delta);
|
|
gfxCtx->ClosePath();
|
|
gfxCtx->Fill();
|
|
}
|
|
|
|
nsresult
|
|
nsMathMLmfracFrame::DisplaySlash(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame, const nsRect& aRect,
|
|
nscoord aThickness,
|
|
const nsDisplayListSet& aLists) {
|
|
if (!aFrame->GetStyleVisibility()->IsVisible() || aRect.IsEmpty())
|
|
return NS_OK;
|
|
|
|
return aLists.Content()->AppendNewToTop(new (aBuilder)
|
|
nsDisplayMathMLSlash(aFrame, aRect,
|
|
aThickness));
|
|
}
|