mozilla
/
gecko-dev
зеркало из https://github.com/mozilla/gecko-dev.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
gecko-dev/layout/mathml/nsMathMLmencloseFrame.cpp

829 строки
28 KiB
C++
Исходник Ответственный История

/* -*- 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 "nsMathMLmencloseFrame.h"
#include "nsPresContext.h"
#include "nsRenderingContext.h"
#include "nsWhitespaceTokenizer.h"
#include "nsDisplayList.h"
#include "gfxContext.h"
#include "nsMathMLChar.h"
#include <algorithm>
//
// <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 char16_t kLongDivChar = ')';
// radical: 'SQUARE ROOT'
static const char16_t kRadicalChar = 0x221A;
// updiagonalstrike
static const uint8_t kArrowHeadSize = 10;
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.
uint32_t 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],
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("updiagonalarrow")) {
mNotationsToDraw |= NOTATION_UPDIAGONALARROW;
} else if (aNotation.EqualsLiteral("downdiagonalstrike")) {
mNotationsToDraw |= NOTATION_DOWNDIAGONALSTRIKE;
} else if (aNotation.EqualsLiteral("verticalstrike")) {
mNotationsToDraw |= NOTATION_VERTICALSTRIKE;
} else if (aNotation.EqualsLiteral("horizontalstrike")) {
mNotationsToDraw |= NOTATION_HORIZONTALSTRIKE;
} else if (aNotation.EqualsLiteral("madruwb")) {
mNotationsToDraw |= (NOTATION_RIGHT | NOTATION_BOTTOM);
}
return NS_OK;
}
/*
* Initialize the list of notations to draw
*/
void nsMathMLmencloseFrame::InitNotations()
{
mNotationsToDraw = 0;
mLongDivCharIndex = mRadicalCharIndex = -1;
mMathMLChar.Clear();
nsAutoString value;
if (mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::notation_, value)) {
// parse the notation attribute
nsWhitespaceTokenizer tokenizer(value);
while (tokenizer.hasMoreTokens())
AddNotation(tokenizer.nextToken());
if (IsToDraw(NOTATION_UPDIAGONALARROW)) {
// For <menclose notation="updiagonalstrike updiagonalarrow">, if
// the two notations are drawn then the strike line may cause the point of
// the arrow to be too wide. Hence we will only draw the updiagonalarrow
// and the arrow shaft may be thought to be the updiagonalstrike.
mNotationsToDraw &= ~NOTATION_UPDIAGONALSTRIKE;
}
} else {
// default: longdiv
if (NS_FAILED(AllocateMathMLChar(NOTATION_LONGDIV)))
return;
mNotationsToDraw = NOTATION_LONGDIV;
}
}
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;
InitNotations();
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;
}
void
nsMathMLmencloseFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
/////////////
// paint the menclosed content
nsMathMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
if (NS_MATHML_HAS_ERROR(mPresentationData.flags))
return;
nsRect mencloseRect = nsIFrame::GetRect();
mencloseRect.x = mencloseRect.y = 0;
if (IsToDraw(NOTATION_RADICAL)) {
mMathMLChar[mRadicalCharIndex].Display(aBuilder, this, aLists, 0);
nsRect rect;
mMathMLChar[mRadicalCharIndex].GetRect(rect);
rect.MoveBy(StyleVisibility()->mDirection ? -mContentWidth : rect.width, 0);
rect.SizeTo(mContentWidth, mRuleThickness);
DisplayBar(aBuilder, this, rect, aLists);
}
if (IsToDraw(NOTATION_LONGDIV)) {
mMathMLChar[mLongDivCharIndex].Display(aBuilder, this, aLists, 1);
nsRect rect;
mMathMLChar[mLongDivCharIndex].GetRect(rect);
rect.SizeTo(rect.width + mContentWidth, mRuleThickness);
DisplayBar(aBuilder, this, rect, aLists);
}
if (IsToDraw(NOTATION_TOP)) {
nsRect rect(0, 0, mencloseRect.width, mRuleThickness);
DisplayBar(aBuilder, this, rect, aLists);
}
if (IsToDraw(NOTATION_BOTTOM)) {
nsRect rect(0, mencloseRect.height - mRuleThickness,
mencloseRect.width, mRuleThickness);
DisplayBar(aBuilder, this, rect, aLists);
}
if (IsToDraw(NOTATION_LEFT)) {
nsRect rect(0, 0, mRuleThickness, mencloseRect.height);
DisplayBar(aBuilder, this, rect, aLists);
}
if (IsToDraw(NOTATION_RIGHT)) {
nsRect rect(mencloseRect.width - mRuleThickness, 0,
mRuleThickness, mencloseRect.height);
DisplayBar(aBuilder, this, rect, aLists);
}
if (IsToDraw(NOTATION_ROUNDEDBOX)) {
DisplayNotation(aBuilder, this, mencloseRect, aLists,
mRuleThickness, NOTATION_ROUNDEDBOX);
}
if (IsToDraw(NOTATION_CIRCLE)) {
DisplayNotation(aBuilder, this, mencloseRect, aLists,
mRuleThickness, NOTATION_CIRCLE);
}
if (IsToDraw(NOTATION_UPDIAGONALSTRIKE)) {
DisplayNotation(aBuilder, this, mencloseRect, aLists,
mRuleThickness, NOTATION_UPDIAGONALSTRIKE);
}
if (IsToDraw(NOTATION_UPDIAGONALARROW)) {
DisplayNotation(aBuilder, this, mencloseRect, aLists,
mRuleThickness, NOTATION_UPDIAGONALARROW);
}
if (IsToDraw(NOTATION_DOWNDIAGONALSTRIKE)) {
DisplayNotation(aBuilder, this, mencloseRect, aLists,
mRuleThickness, NOTATION_DOWNDIAGONALSTRIKE);
}
if (IsToDraw(NOTATION_HORIZONTALSTRIKE)) {
nsRect rect(0, mencloseRect.height / 2 - mRuleThickness / 2,
mencloseRect.width, mRuleThickness);
DisplayBar(aBuilder, this, rect, aLists);
}
if (IsToDraw(NOTATION_VERTICALSTRIKE)) {
nsRect rect(mencloseRect.width / 2 - mRuleThickness / 2, 0,
mRuleThickness, mencloseRect.height);
DisplayBar(aBuilder, this, rect, aLists);
}
}
/* virtual */ nsresult
nsMathMLmencloseFrame::MeasureForWidth(nsRenderingContext& aRenderingContext,
nsHTMLReflowMetrics& aDesiredSize)
{
return PlaceInternal(aRenderingContext, false, aDesiredSize, true);
}
/* virtual */ nsresult
nsMathMLmencloseFrame::Place(nsRenderingContext& aRenderingContext,
bool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
{
return PlaceInternal(aRenderingContext, aPlaceOrigin, aDesiredSize, false);
}
/* virtual */ nsresult
nsMathMLmencloseFrame::PlaceInternal(nsRenderingContext& aRenderingContext,
bool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize,
bool aWidthOnly)
{
///////////////
// Measure the size of our content using the base class to format like an
// inferred mrow.
nsHTMLReflowMetrics baseSize(aDesiredSize.GetWritingMode());
nsresult rv =
nsMathMLContainerFrame::Place(aRenderingContext, false, baseSize);
if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
DidReflowChildren(GetFirstPrincipalChild());
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);
nscoord mEmHeight;
nsRefPtr<nsFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
aRenderingContext.SetFont(fm);
GetRuleThickness(aRenderingContext, fm, mRuleThickness);
GetEmHeight(fm, mEmHeight);
char16_t one = '1';
nsBoundingMetrics bmOne = aRenderingContext.GetBoundingMetrics(&one, 1);
///////////////
// 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 (StyleFont()->mMathDisplay == NS_MATHML_DISPLAYSTYLE_BLOCK)
phi = fm->XHeight();
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_UPDIAGONALARROW) ||
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 = std::max(bmOne.ascent, bmBase.ascent);
bmBase.descent = std::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;
///////////////
// updiagonal arrow notation. We need enough space at the top right corner to
// draw the arrow head.
if (IsToDraw(NOTATION_UPDIAGONALARROW)) {
// This is an estimate, see nsDisplayNotation::Paint for the exact head size
nscoord arrowHeadSize = kArrowHeadSize * mRuleThickness;
// We want that the arrow shaft strikes the menclose content and that the
// arrow head does not overlap with that content. Hence we add some space
// on the right. We don't add space on the top but only ensure that the
// ascent is large enough.
dx_right = std::max(dx_right, arrowHeadSize);
mBoundingMetrics.ascent = std::max(mBoundingMetrics.ascent, arrowHeadSize);
}
///////////////
// 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 = std::max(dx_left, padding2);
dx_right = std::max(dx_right, padding2);
// Update vertical parameters
padding2 = ratio * (bmBase.ascent + bmBase.descent);
mBoundingMetrics.ascent = std::max(mBoundingMetrics.ascent,
bmBase.ascent + padding2);
mBoundingMetrics.descent = std::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 = std::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, false);
mMathMLChar[mLongDivCharIndex].GetBoundingMetrics(bmLongdivChar);
// Update horizontal parameters
dx_left = std::max(dx_left, bmLongdivChar.width);
// Update vertical parameters
longdivAscent = bmBase.ascent + psi + mRuleThickness;
longdivDescent = std::max(bmBase.descent,
(bmLongdivChar.ascent + bmLongdivChar.descent -
longdivAscent));
mBoundingMetrics.ascent = std::max(mBoundingMetrics.ascent,
longdivAscent);
mBoundingMetrics.descent = std::max(mBoundingMetrics.descent,
longdivDescent);
}
}
///////////////
// radical notation:
if (IsToDraw(NOTATION_RADICAL)) {
nscoord *dx_leading = StyleVisibility()->mDirection ? &dx_right : &dx_left;
if (aWidthOnly) {
nscoord radical_width = mMathMLChar[mRadicalCharIndex].
GetMaxWidth(PresContext(), aRenderingContext);
// Update horizontal parameters
*dx_leading = std::max(*dx_leading, 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,
StyleVisibility()->mDirection);
mMathMLChar[mRadicalCharIndex].GetBoundingMetrics(bmRadicalChar);
// Update horizontal parameters
*dx_leading = std::max(*dx_leading, bmRadicalChar.width);
// Update vertical parameters
radicalAscent = bmBase.ascent + psi + mRuleThickness;
radicalDescent = std::max(bmBase.descent,
(bmRadicalChar.ascent + bmRadicalChar.descent -
radicalAscent));
mBoundingMetrics.ascent = std::max(mBoundingMetrics.ascent,
radicalAscent);
mBoundingMetrics.descent = std::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 = std::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 = std::min(0, dx_left + bmBase.leftBearing);
mBoundingMetrics.rightBearing =
std::max(mBoundingMetrics.width, dx_left + bmBase.rightBearing);
aDesiredSize.Width() = mBoundingMetrics.width;
aDesiredSize.SetTopAscent(std::max(mBoundingMetrics.ascent, baseSize.TopAscent()));
aDesiredSize.Height() = aDesiredSize.TopAscent() +
std::max(mBoundingMetrics.descent, baseSize.Height() - baseSize.TopAscent());
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.TopAscent();
nscoord desiredSizeDescent = aDesiredSize.Height() - aDesiredSize.TopAscent();
if (IsToDraw(NOTATION_LONGDIV)) {
desiredSizeAscent = std::max(desiredSizeAscent,
longdivAscent + leading);
desiredSizeDescent = std::max(desiredSizeDescent,
longdivDescent + mRuleThickness);
}
if (IsToDraw(NOTATION_RADICAL)) {
desiredSizeAscent = std::max(desiredSizeAscent,
radicalAscent + leading);
desiredSizeDescent = std::max(desiredSizeDescent,
radicalDescent + mRuleThickness);
}
aDesiredSize.SetTopAscent(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 = std::max(aDesiredSize.TopAscent() - bmBase.ascent,
aDesiredSize.Height() - aDesiredSize.TopAscent() -
bmBase.descent);
aDesiredSize.SetTopAscent(bmBase.ascent + dy);
aDesiredSize.Height() = aDesiredSize.TopAscent() + bmBase.descent + dy;
}
// Update mBoundingMetrics ascent/descent
if (IsToDraw(NOTATION_TOP) ||
IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
IsToDraw(NOTATION_UPDIAGONALARROW) ||
IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
IsToDraw(NOTATION_VERTICALSTRIKE) ||
IsToDraw(NOTATION_CIRCLE) ||
IsToDraw(NOTATION_ROUNDEDBOX))
mBoundingMetrics.ascent = aDesiredSize.TopAscent();
if (IsToDraw(NOTATION_BOTTOM) ||
IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
IsToDraw(NOTATION_UPDIAGONALARROW) ||
IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
IsToDraw(NOTATION_VERTICALSTRIKE) ||
IsToDraw(NOTATION_CIRCLE) ||
IsToDraw(NOTATION_ROUNDEDBOX))
mBoundingMetrics.descent = aDesiredSize.Height() - aDesiredSize.TopAscent();
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
mReference.x = 0;
mReference.y = aDesiredSize.TopAscent();
if (aPlaceOrigin) {
//////////////////
// Set position and size of MathMLChars
if (IsToDraw(NOTATION_LONGDIV))
mMathMLChar[mLongDivCharIndex].SetRect(nsRect(dx_left -
bmLongdivChar.width,
aDesiredSize.TopAscent() -
longdivAscent,
bmLongdivChar.width,
bmLongdivChar.ascent +
bmLongdivChar.descent));
if (IsToDraw(NOTATION_RADICAL)) {
nscoord dx = (StyleVisibility()->mDirection ?
dx_left + bmBase.width : dx_left - bmRadicalChar.width);
mMathMLChar[mRadicalCharIndex].SetRect(nsRect(dx,
aDesiredSize.TopAscent() -
radicalAscent,
bmRadicalChar.width,
bmRadicalChar.ascent +
bmRadicalChar.descent));
}
mContentWidth = bmBase.width;
//////////////////
// Finish reflowing child frames
PositionRowChildFrames(dx_left, aDesiredSize.TopAscent());
}
return NS_OK;
}
nscoord
nsMathMLmencloseFrame::FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize)
{
nscoord gap = nsMathMLContainerFrame::FixInterFrameSpacing(aDesiredSize);
if (!gap)
return 0;
// Move the MathML characters
nsRect rect;
for (uint32_t i = 0; i < mMathMLChar.Length(); i++) {
mMathMLChar[i].GetRect(rect);
rect.MoveBy(gap, 0);
mMathMLChar[i].SetRect(rect);
}
return gap;
}
NS_IMETHODIMP
nsMathMLmencloseFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
if (aAttribute == nsGkAtoms::notation_) {
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(int32_t aIndex) const
{
int32_t len = mMathMLChar.Length();
if (aIndex >= 0 && aIndex < len)
return mMathMLChar[aIndex].GetStyleContext();
else
return nullptr;
}
void
nsMathMLmencloseFrame::SetAdditionalStyleContext(int32_t aIndex,
nsStyleContext* aStyleContext)
{
int32_t len = mMathMLChar.Length();
if (aIndex >= 0 && aIndex < len)
mMathMLChar[aIndex].SetStyleContext(aStyleContext);
}
class nsDisplayNotation : public nsDisplayItem
{
public:
nsDisplayNotation(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, const nsRect& aRect,
nscoord aThickness, nsMencloseNotation aType)
: nsDisplayItem(aBuilder, 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,
nsRenderingContext* aCtx);
NS_DISPLAY_DECL_NAME("MathMLMencloseNotation", TYPE_MATHML_MENCLOSE_NOTATION)
private:
nsRect mRect;
nscoord mThickness;
nsMencloseNotation mType;
};
void nsDisplayNotation::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
// get the gfxRect
nsPresContext* presContext = mFrame->PresContext();
gfxRect rect = presContext->AppUnitsToGfxUnits(mRect + ToReferenceFrame());
// paint the frame with the current text color
aCtx->SetColor(mFrame->GetVisitedDependentColor(eCSSProperty_color));
// change line width to mThickness
gfxContext *gfxCtx = aCtx->ThebesContext();
gfxFloat e = presContext->AppUnitsToGfxUnits(mThickness);
gfxCtx->Save();
gfxCtx->SetLineWidth(e);
rect.Deflate(e / 2.0);
switch(mType)
{
case NOTATION_CIRCLE:
gfxCtx->NewPath();
gfxCtx->Ellipse(rect.Center(), rect.Size());
gfxCtx->Stroke();
break;
case NOTATION_ROUNDEDBOX:
gfxCtx->NewPath();
gfxCtx->RoundedRectangle(rect, gfxCornerSizes(3 * e), true);
gfxCtx->Stroke();
break;
case NOTATION_UPDIAGONALSTRIKE:
gfxCtx->NewPath();
gfxCtx->Line(rect.BottomLeft(), rect.TopRight());
gfxCtx->Stroke();
break;
case NOTATION_DOWNDIAGONALSTRIKE:
gfxCtx->NewPath();
gfxCtx->Line(rect.TopLeft(), rect.BottomRight());
gfxCtx->Stroke();
break;
case NOTATION_UPDIAGONALARROW: {
// Compute some parameters to draw the updiagonalarrow. The values below
// are taken from MathJax's HTML-CSS output.
gfxFloat W = rect.Width(); gfxFloat H = rect.Height();
gfxFloat l = sqrt(W*W + H*H);
gfxFloat f = gfxFloat(kArrowHeadSize) * e / l;
gfxFloat w = W * f; gfxFloat h = H * f;
// Draw the arrow shaft
gfxCtx->NewPath();
gfxCtx->Line(rect.BottomLeft(), rect.TopRight() + gfxPoint(-.7*w, .7*h));
gfxCtx->Stroke();
// Draw the arrow head
gfxCtx->NewPath();
gfxPoint p[] = {
rect.TopRight(),
rect.TopRight() + gfxPoint(-w -.4*h, std::max(-e / 2.0, h - .4*w)),
rect.TopRight() + gfxPoint(-.7*w, .7*h),
rect.TopRight() + gfxPoint(std::min(e / 2.0, -w + .4*h), h + .4*w),
rect.TopRight()
};
gfxCtx->Polygon(p, MOZ_ARRAY_LENGTH(p));
gfxCtx->Fill();
}
break;
default:
NS_NOTREACHED("This notation can not be drawn using nsDisplayNotation");
break;
}
gfxCtx->Restore();
}
void
nsMathMLmencloseFrame::DisplayNotation(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, const nsRect& aRect,
const nsDisplayListSet& aLists,
nscoord aThickness,
nsMencloseNotation aType)
{
if (!aFrame->StyleVisibility()->IsVisible() || aRect.IsEmpty() ||
aThickness <= 0)
return;
aLists.Content()->AppendNewToTop(new (aBuilder)
nsDisplayNotation(aBuilder, aFrame, aRect, aThickness, aType));
}
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку