mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-05 08:35:26 +00:00
c5b9eee040
Except for the changes in: layout/generic/nsIFrame.h (part) layout/style/nsComputedDOMStyle.h (all) layout/style/nsRuleNode.cpp (part) layout/style/nsStyleContext.cpp (part) layout/style/nsStyleContext.h (part) (see patch 3b in the bug), this patch was written with the sed script: s/\<GetStyle\(Font\|Color\|List\|Text\|Visibility\|Quotes\|UserInterface\|TableBorder\|SVG\|Background\|Position\|TextReset\|Display\|Content\|UIReset\|Table\|Margin\|Padding\|Border\|Outline\|XUL\|SVGReset\|Column\)\>/Style\1/g
600 lines
22 KiB
C++
600 lines
22 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
|
|
#include "nsCOMPtr.h"
|
|
#include "nsFrame.h"
|
|
#include "nsPresContext.h"
|
|
#include "nsStyleContext.h"
|
|
#include "nsStyleConsts.h"
|
|
#include "nsRenderingContext.h"
|
|
|
|
#include "nsMathMLmfracFrame.h"
|
|
#include "nsDisplayList.h"
|
|
#include "gfxContext.h"
|
|
#include <algorithm>
|
|
|
|
//
|
|
// <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 THICK_FRACTION_LINE 2.0f
|
|
#define THICK_FRACTION_LINE_MINIMUM_PIXELS 2 // minimum of 2 pixels
|
|
|
|
nsIFrame*
|
|
NS_NewMathMLmfracFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
|
|
{
|
|
return new (aPresShell) nsMathMLmfracFrame(aContext);
|
|
}
|
|
|
|
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmfracFrame)
|
|
|
|
nsMathMLmfracFrame::~nsMathMLmfracFrame()
|
|
{
|
|
}
|
|
|
|
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
|
|
bool 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;
|
|
|
|
// linethickness
|
|
//
|
|
// "Specifies the thickness of the horizontal 'fraction bar', or 'rule'. The
|
|
// default value is 'medium', 'thin' is thinner, but visible, 'thick' is
|
|
// thicker; the exact thickness of these is left up to the rendering agent."
|
|
//
|
|
// values: length | "thin" | "medium" | "thick"
|
|
// default: medium
|
|
//
|
|
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")) {
|
|
// medium is default
|
|
}
|
|
else if (aThicknessAttribute.EqualsLiteral("thick")) {
|
|
lineThickness = NSToCoordCeil(defaultThickness * THICK_FRACTION_LINE);
|
|
minimumThickness = onePixel * THICK_FRACTION_LINE_MINIMUM_PIXELS;
|
|
// should visually increase by at least one pixel
|
|
if (lineThickness < defaultThickness + onePixel)
|
|
lineThickness = defaultThickness + onePixel;
|
|
}
|
|
else {
|
|
// length value
|
|
lineThickness = defaultThickness;
|
|
ParseNumericValue(aThicknessAttribute, &lineThickness,
|
|
nsMathMLElement::PARSE_ALLOW_UNITLESS,
|
|
aPresContext, aStyleContext);
|
|
}
|
|
}
|
|
|
|
// use minimum if the lineThickness is a non-zero value less than minimun
|
|
if (lineThickness && lineThickness < minimumThickness)
|
|
lineThickness = minimumThickness;
|
|
|
|
return lineThickness;
|
|
}
|
|
|
|
void
|
|
nsMathMLmfracFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsRect& aDirtyRect,
|
|
const nsDisplayListSet& aLists)
|
|
{
|
|
/////////////
|
|
// paint the numerator and denominator
|
|
nsMathMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
|
|
|
|
/////////////
|
|
// paint the fraction line
|
|
if (mIsBevelled) {
|
|
DisplaySlash(aBuilder, this, mLineRect, mLineThickness, aLists);
|
|
} else {
|
|
DisplayBar(aBuilder, this, mLineRect, aLists);
|
|
}
|
|
}
|
|
|
|
/* virtual */ nsresult
|
|
nsMathMLmfracFrame::MeasureForWidth(nsRenderingContext& aRenderingContext,
|
|
nsHTMLReflowMetrics& aDesiredSize)
|
|
{
|
|
return PlaceInternal(aRenderingContext,
|
|
false,
|
|
aDesiredSize,
|
|
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(nsRenderingContext& aRenderingContext,
|
|
bool aPlaceOrigin,
|
|
nsHTMLReflowMetrics& aDesiredSize)
|
|
{
|
|
return PlaceInternal(aRenderingContext,
|
|
aPlaceOrigin,
|
|
aDesiredSize,
|
|
false);
|
|
}
|
|
|
|
nsresult
|
|
nsMathMLmfracFrame::PlaceInternal(nsRenderingContext& aRenderingContext,
|
|
bool aPlaceOrigin,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
bool aWidthOnly)
|
|
{
|
|
////////////////////////////////////
|
|
// Get the children's desired sizes
|
|
nsBoundingMetrics bmNum, bmDen;
|
|
nsHTMLReflowMetrics sizeNum;
|
|
nsHTMLReflowMetrics sizeDen;
|
|
nsIFrame* frameDen = nullptr;
|
|
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
|
|
if (aPlaceOrigin) {
|
|
ReportChildCountError();
|
|
}
|
|
return ReflowError(aRenderingContext, aDesiredSize);
|
|
}
|
|
GetReflowAndBoundingMetricsFor(frameNum, sizeNum, bmNum);
|
|
GetReflowAndBoundingMetricsFor(frameDen, sizeDen, bmDen);
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
|
|
|
|
nsRefPtr<nsFontMetrics> fm;
|
|
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
|
|
aRenderingContext.SetFont(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);
|
|
|
|
// bevelled attribute
|
|
GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::bevelled_,
|
|
value);
|
|
mIsBevelled = value.EqualsLiteral("true");
|
|
|
|
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 = std::max(onePixel,
|
|
NS_MATHML_IS_RTL(mPresentationData.flags) ?
|
|
coreData.trailingSpace : coreData.leadingSpace);
|
|
nscoord rightSpace = std::max(onePixel,
|
|
NS_MATHML_IS_RTL(mPresentationData.flags) ?
|
|
coreData.leadingSpace : coreData.trailingSpace);
|
|
|
|
//////////////////
|
|
// 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 = std::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 =
|
|
std::max(dxNum + bmNum.rightBearing, dxDen + bmDen.rightBearing);
|
|
if (mBoundingMetrics.rightBearing < width - rightSpace)
|
|
mBoundingMetrics.rightBearing = width - rightSpace;
|
|
mBoundingMetrics.leftBearing =
|
|
std::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, nullptr, sizeNum, dxNum, dy, 0);
|
|
// place denominator
|
|
dy = aDesiredSize.height - sizeDen.height;
|
|
FinishReflowChild(frameDen, presContext, nullptr, 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->EmHeight();
|
|
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 *
|
|
std::min(2 * mLineThickness, slashMaxWidthConstant);
|
|
|
|
nscoord leadingSpace = std::max(padding, coreData.leadingSpace);
|
|
nscoord trailingSpace = std::max(padding, coreData.trailingSpace);
|
|
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 = std::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 = std::min(bmDen.ascent + bmDen.descent,
|
|
bmNum.ascent + bmNum.descent) / 2;
|
|
numShift += delta;
|
|
denShift += delta;
|
|
} else {
|
|
nscoord xHeight = fm->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 +
|
|
std::min(slashMaxWidthConstant,
|
|
(mBoundingMetrics.ascent + mBoundingMetrics.descent) /
|
|
slashRatio);
|
|
}
|
|
|
|
// Set horizontal bounding metrics
|
|
if (NS_MATHML_IS_RTL(mPresentationData.flags)) {
|
|
mBoundingMetrics.leftBearing = trailingSpace + bmDen.leftBearing;
|
|
mBoundingMetrics.rightBearing = trailingSpace + bmDen.width + mLineRect.width + bmNum.rightBearing;
|
|
} else {
|
|
mBoundingMetrics.leftBearing = leadingSpace + bmNum.leftBearing;
|
|
mBoundingMetrics.rightBearing = leadingSpace + bmNum.width + mLineRect.width + bmDen.rightBearing;
|
|
}
|
|
mBoundingMetrics.width =
|
|
leadingSpace + bmNum.width + mLineRect.width + bmDen.width +
|
|
trailingSpace;
|
|
|
|
// 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) {
|
|
nscoord dx, dy;
|
|
|
|
// place numerator
|
|
dx = MirrorIfRTL(aDesiredSize.width, sizeNum.width,
|
|
leadingSpace);
|
|
dy = aDesiredSize.ascent - numShift - sizeNum.ascent;
|
|
FinishReflowChild(frameNum, presContext, nullptr, sizeNum, dx, dy, 0);
|
|
|
|
// place the fraction bar
|
|
dx = MirrorIfRTL(aDesiredSize.width, mLineRect.width,
|
|
leadingSpace + bmNum.width);
|
|
dy = aDesiredSize.ascent - mBoundingMetrics.ascent;
|
|
mLineRect.SetRect(dx, dy,
|
|
mLineRect.width, aDesiredSize.height - 2 * padding);
|
|
|
|
// place denominator
|
|
dx = MirrorIfRTL(aDesiredSize.width, sizeDen.width,
|
|
leadingSpace + bmNum.width + mLineRect.width);
|
|
dy = aDesiredSize.ascent + denShift - sizeDen.ascent;
|
|
FinishReflowChild(frameDen, presContext, nullptr, sizeDen, dx, dy, 0);
|
|
}
|
|
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLmfracFrame::UpdatePresentationDataFromChildAt(int32_t aFirstIndex,
|
|
int32_t aLastIndex,
|
|
uint32_t aFlagsValues,
|
|
uint32_t 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(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame, const nsRect& aRect,
|
|
nscoord aThickness, bool aRTL)
|
|
: nsDisplayItem(aBuilder, aFrame), mRect(aRect), mThickness(aThickness),
|
|
mRTL(aRTL) {
|
|
MOZ_COUNT_CTOR(nsDisplayMathMLSlash);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayMathMLSlash() {
|
|
MOZ_COUNT_DTOR(nsDisplayMathMLSlash);
|
|
}
|
|
#endif
|
|
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx);
|
|
NS_DISPLAY_DECL_NAME("MathMLSlash", TYPE_MATHML_SLASH)
|
|
|
|
private:
|
|
nsRect mRect;
|
|
nscoord mThickness;
|
|
bool mRTL;
|
|
};
|
|
|
|
void nsDisplayMathMLSlash::Paint(nsDisplayListBuilder* aBuilder,
|
|
nsRenderingContext* aCtx)
|
|
{
|
|
// get the gfxRect
|
|
nsPresContext* presContext = mFrame->PresContext();
|
|
gfxRect rect = presContext->AppUnitsToGfxUnits(mRect + ToReferenceFrame());
|
|
|
|
// paint with the current text color
|
|
aCtx->SetColor(mFrame->GetVisitedDependentColor(eCSSProperty_color));
|
|
|
|
// draw the slash as a parallelogram
|
|
gfxContext *gfxCtx = aCtx->ThebesContext();
|
|
gfxPoint delta = gfxPoint(presContext->AppUnitsToGfxUnits(mThickness), 0);
|
|
gfxCtx->NewPath();
|
|
|
|
if (mRTL) {
|
|
gfxCtx->MoveTo(rect.TopLeft());
|
|
gfxCtx->LineTo(rect.TopLeft() + delta);
|
|
gfxCtx->LineTo(rect.BottomRight());
|
|
gfxCtx->LineTo(rect.BottomRight() - delta);
|
|
} else {
|
|
gfxCtx->MoveTo(rect.BottomLeft());
|
|
gfxCtx->LineTo(rect.BottomLeft() + delta);
|
|
gfxCtx->LineTo(rect.TopRight());
|
|
gfxCtx->LineTo(rect.TopRight() - delta);
|
|
}
|
|
|
|
gfxCtx->ClosePath();
|
|
gfxCtx->Fill();
|
|
}
|
|
|
|
void
|
|
nsMathMLmfracFrame::DisplaySlash(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame, const nsRect& aRect,
|
|
nscoord aThickness,
|
|
const nsDisplayListSet& aLists) {
|
|
if (!aFrame->StyleVisibility()->IsVisible() || aRect.IsEmpty())
|
|
return;
|
|
|
|
aLists.Content()->AppendNewToTop(new (aBuilder)
|
|
nsDisplayMathMLSlash(aBuilder, aFrame, aRect, aThickness,
|
|
NS_MATHML_IS_RTL(mPresentationData.flags)));
|
|
}
|