зеркало из https://github.com/mozilla/gecko-dev.git
746 строки
24 KiB
C++
746 строки
24 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* 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 "gfxContext.h"
|
|
#include "nsMathMLmfencedFrame.h"
|
|
#include "nsMathMLChar.h"
|
|
#include <algorithm>
|
|
|
|
using namespace mozilla;
|
|
|
|
//
|
|
// <mfenced> -- surround content with a pair of fences
|
|
//
|
|
|
|
nsIFrame*
|
|
NS_NewMathMLmfencedFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle)
|
|
{
|
|
return new (aPresShell) nsMathMLmfencedFrame(aStyle);
|
|
}
|
|
|
|
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmfencedFrame)
|
|
|
|
void
|
|
nsMathMLmfencedFrame::DestroyFrom(nsIFrame* aDestructRoot,
|
|
PostDestroyData& aPostDestroyData)
|
|
{
|
|
RemoveFencesAndSeparators();
|
|
nsMathMLContainerFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLmfencedFrame::InheritAutomaticData(nsIFrame* aParent)
|
|
{
|
|
// let the base class get the default from our parent
|
|
nsMathMLContainerFrame::InheritAutomaticData(aParent);
|
|
|
|
mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
|
|
|
|
RemoveFencesAndSeparators();
|
|
CreateFencesAndSeparators(PresContext());
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
nsMathMLmfencedFrame::SetInitialChildList(ChildListID aListID,
|
|
nsFrameList& aChildList)
|
|
{
|
|
// First, let the base class do its work
|
|
nsMathMLContainerFrame::SetInitialChildList(aListID, aChildList);
|
|
|
|
// InheritAutomaticData will not get called if our parent is not a mathml
|
|
// frame, so initialize NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY for
|
|
// GetPreferredStretchSize() from Reflow().
|
|
mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
|
|
// No need to track the ComputedStyle given to our MathML chars.
|
|
// The Style System will use Get/SetAdditionalComputedStyle() to keep them
|
|
// up-to-date if dynamic changes arise.
|
|
CreateFencesAndSeparators(PresContext());
|
|
}
|
|
|
|
nsresult
|
|
nsMathMLmfencedFrame::AttributeChanged(int32_t aNameSpaceID,
|
|
nsAtom* aAttribute,
|
|
int32_t aModType)
|
|
{
|
|
RemoveFencesAndSeparators();
|
|
CreateFencesAndSeparators(PresContext());
|
|
|
|
return nsMathMLContainerFrame::
|
|
AttributeChanged(aNameSpaceID, aAttribute, aModType);
|
|
}
|
|
|
|
nsresult
|
|
nsMathMLmfencedFrame::ChildListChanged(int32_t aModType)
|
|
{
|
|
RemoveFencesAndSeparators();
|
|
CreateFencesAndSeparators(PresContext());
|
|
|
|
return nsMathMLContainerFrame::ChildListChanged(aModType);
|
|
}
|
|
|
|
void
|
|
nsMathMLmfencedFrame::RemoveFencesAndSeparators()
|
|
{
|
|
MarkNeedsDisplayItemRebuild();
|
|
delete mOpenChar;
|
|
delete mCloseChar;
|
|
if (mSeparatorsChar) delete[] mSeparatorsChar;
|
|
|
|
mOpenChar = nullptr;
|
|
mCloseChar = nullptr;
|
|
mSeparatorsChar = nullptr;
|
|
mSeparatorsCount = 0;
|
|
}
|
|
|
|
void
|
|
nsMathMLmfencedFrame::CreateFencesAndSeparators(nsPresContext* aPresContext)
|
|
{
|
|
nsAutoString value;
|
|
|
|
//////////////
|
|
// see if the opening fence is there ...
|
|
if (!mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::open, value)) {
|
|
value = char16_t('('); // default as per the MathML REC
|
|
} else {
|
|
value.CompressWhitespace();
|
|
}
|
|
|
|
if (!value.IsEmpty()) {
|
|
mOpenChar = new nsMathMLChar;
|
|
mOpenChar->SetData(value);
|
|
ResolveMathMLCharStyle(aPresContext, mContent, mComputedStyle, mOpenChar);
|
|
}
|
|
|
|
//////////////
|
|
// see if the closing fence is there ...
|
|
if(!mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::close, value)) {
|
|
value = char16_t(')'); // default as per the MathML REC
|
|
} else {
|
|
value.CompressWhitespace();
|
|
}
|
|
|
|
if (!value.IsEmpty()) {
|
|
mCloseChar = new nsMathMLChar;
|
|
mCloseChar->SetData(value);
|
|
ResolveMathMLCharStyle(aPresContext, mContent, mComputedStyle, mCloseChar);
|
|
}
|
|
|
|
//////////////
|
|
// see if separators are there ...
|
|
if (!mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::separators_, value)) {
|
|
value = char16_t(','); // default as per the MathML REC
|
|
} else {
|
|
value.StripWhitespace();
|
|
}
|
|
|
|
mSeparatorsCount = value.Length();
|
|
if (0 < mSeparatorsCount) {
|
|
int32_t sepCount = mFrames.GetLength() - 1;
|
|
if (0 < sepCount) {
|
|
mSeparatorsChar = new nsMathMLChar[sepCount];
|
|
nsAutoString sepChar;
|
|
for (int32_t i = 0; i < sepCount; i++) {
|
|
if (i < mSeparatorsCount) {
|
|
sepChar = value[i];
|
|
}
|
|
else {
|
|
sepChar = value[mSeparatorsCount-1];
|
|
}
|
|
mSeparatorsChar[i].SetData(sepChar);
|
|
ResolveMathMLCharStyle(aPresContext, mContent, mComputedStyle, &mSeparatorsChar[i]);
|
|
}
|
|
mSeparatorsCount = sepCount;
|
|
} else {
|
|
// No separators. Note that sepCount can be -1 here, so don't
|
|
// set mSeparatorsCount to it.
|
|
mSeparatorsCount = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
nsMathMLmfencedFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayListSet& aLists)
|
|
{
|
|
/////////////
|
|
// display the content
|
|
nsMathMLContainerFrame::BuildDisplayList(aBuilder, aLists);
|
|
|
|
////////////
|
|
// display fences and separators
|
|
uint32_t count = 0;
|
|
if (mOpenChar) {
|
|
mOpenChar->Display(aBuilder, this, aLists, count++);
|
|
}
|
|
|
|
if (mCloseChar) {
|
|
mCloseChar->Display(aBuilder, this, aLists, count++);
|
|
}
|
|
|
|
for (int32_t i = 0; i < mSeparatorsCount; i++) {
|
|
mSeparatorsChar[i].Display(aBuilder, this, aLists, count++);
|
|
}
|
|
}
|
|
|
|
/* @param aMetrics is an IN/OUT. Provide the current metrics for the mFenced
|
|
frame and it will be enlarged as necessary.
|
|
For simplicity the width of the container is always incremented by the width
|
|
of the nsMathMLChar. As we only stretch fences and separators in the vertical
|
|
direction, this has no impact on overall appearance.
|
|
*/
|
|
static void
|
|
ApplyUnstretchedMetrics(nsIFrame* aFrame,
|
|
DrawTarget* aDrawTarget,
|
|
float aFontSizeInflation,
|
|
nsMathMLChar* aMathMLChar,
|
|
nsBoundingMetrics& aMetrics,
|
|
bool aIsRTL)
|
|
{
|
|
if (aMathMLChar && 0 < aMathMLChar->Length()) {
|
|
nsBoundingMetrics charSize;
|
|
aMathMLChar->Stretch(aFrame, aDrawTarget, aFontSizeInflation,
|
|
NS_STRETCH_DIRECTION_DEFAULT,
|
|
aMetrics, // size is unimportant as we aren't stretching
|
|
charSize, NS_STRETCH_NONE, aIsRTL);
|
|
aMetrics += charSize;
|
|
}
|
|
}
|
|
|
|
void
|
|
nsMathMLmfencedFrame::Reflow(nsPresContext* aPresContext,
|
|
ReflowOutput& aDesiredSize,
|
|
const ReflowInput& aReflowInput,
|
|
nsReflowStatus& aStatus)
|
|
{
|
|
MarkInReflow();
|
|
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
|
|
|
|
mPresentationData.flags &= ~NS_MATHML_ERROR;
|
|
aDesiredSize.ClearSize();
|
|
aDesiredSize.SetBlockStartAscent(0);
|
|
aDesiredSize.mBoundingMetrics = nsBoundingMetrics();
|
|
|
|
int32_t i;
|
|
const nsStyleFont* font = StyleFont();
|
|
float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
|
|
RefPtr<nsFontMetrics> fm =
|
|
nsLayoutUtils::GetFontMetricsForFrame(this, fontSizeInflation);
|
|
nscoord axisHeight, em;
|
|
GetAxisHeight(aReflowInput.mRenderingContext->GetDrawTarget(), fm, axisHeight);
|
|
GetEmHeight(fm, em);
|
|
// leading to be left at the top and the bottom of stretched chars
|
|
nscoord leading = NSToCoordRound(0.2f * em);
|
|
|
|
/////////////
|
|
// Reflow children
|
|
// Asking each child to cache its bounding metrics
|
|
|
|
// Note that we don't use the base method nsMathMLContainerFrame::Reflow()
|
|
// because we want to stretch our fences, separators and stretchy frames using
|
|
// the *same* initial aDesiredSize.mBoundingMetrics. If we were to use the base
|
|
// method here, our stretchy frames will be stretched and placed, and we may
|
|
// end up stretching our fences/separators with a different aDesiredSize.
|
|
// XXX The above decision was revisited in bug 121748 and this code can be
|
|
// refactored to use nsMathMLContainerFrame::Reflow() at some stage.
|
|
|
|
nsReflowStatus childStatus;
|
|
nsIFrame* firstChild = PrincipalChildList().FirstChild();
|
|
nsIFrame* childFrame = firstChild;
|
|
nscoord ascent = 0, descent = 0;
|
|
if (firstChild || mOpenChar || mCloseChar || mSeparatorsCount > 0) {
|
|
// We use the ASCII metrics to get our minimum height. This way,
|
|
// if we have borders or a background, they will fit better with
|
|
// other elements on the line.
|
|
ascent = fm->MaxAscent();
|
|
descent = fm->MaxDescent();
|
|
}
|
|
while (childFrame) {
|
|
ReflowOutput childDesiredSize(aReflowInput);
|
|
WritingMode wm = childFrame->GetWritingMode();
|
|
LogicalSize availSize = aReflowInput.ComputedSize(wm);
|
|
availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
|
|
ReflowInput childReflowInput(aPresContext, aReflowInput,
|
|
childFrame, availSize);
|
|
ReflowChild(childFrame, aPresContext, childDesiredSize,
|
|
childReflowInput, childStatus);
|
|
//NS_ASSERTION(childStatus.IsComplete(), "bad status");
|
|
SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
|
|
childDesiredSize.mBoundingMetrics);
|
|
|
|
mozilla::WritingMode outerWM = aReflowInput.GetWritingMode();
|
|
nscoord childDescent = childDesiredSize.BSize(outerWM) -
|
|
childDesiredSize.BlockStartAscent();
|
|
if (descent < childDescent)
|
|
descent = childDescent;
|
|
if (ascent < childDesiredSize.BlockStartAscent())
|
|
ascent = childDesiredSize.BlockStartAscent();
|
|
|
|
childFrame = childFrame->GetNextSibling();
|
|
}
|
|
|
|
/////////////
|
|
// Ask stretchy children to stretch themselves
|
|
|
|
nsBoundingMetrics containerSize;
|
|
nsStretchDirection stretchDir = NS_STRETCH_DIRECTION_VERTICAL;
|
|
|
|
DrawTarget* drawTarget = aReflowInput.mRenderingContext->GetDrawTarget();
|
|
|
|
GetPreferredStretchSize(drawTarget,
|
|
0, /* i.e., without embellishments */
|
|
stretchDir, containerSize);
|
|
childFrame = firstChild;
|
|
while (childFrame) {
|
|
nsIMathMLFrame* mathmlChild = do_QueryFrame(childFrame);
|
|
if (mathmlChild) {
|
|
ReflowOutput childDesiredSize(aReflowInput);
|
|
// retrieve the metrics that was stored at the previous pass
|
|
GetReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
|
|
childDesiredSize.mBoundingMetrics);
|
|
|
|
mathmlChild->Stretch(drawTarget,
|
|
stretchDir, containerSize, childDesiredSize);
|
|
// store the updated metrics
|
|
SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
|
|
childDesiredSize.mBoundingMetrics);
|
|
|
|
nscoord childDescent = childDesiredSize.Height() - childDesiredSize.BlockStartAscent();
|
|
if (descent < childDescent)
|
|
descent = childDescent;
|
|
if (ascent < childDesiredSize.BlockStartAscent())
|
|
ascent = childDesiredSize.BlockStartAscent();
|
|
}
|
|
childFrame = childFrame->GetNextSibling();
|
|
}
|
|
|
|
// bug 121748: for surrounding fences & separators, use a size that covers everything
|
|
GetPreferredStretchSize(drawTarget, STRETCH_CONSIDER_EMBELLISHMENTS,
|
|
stretchDir, containerSize);
|
|
|
|
bool isRTL = StyleVisibility()->mDirection;
|
|
|
|
// To achieve a minimum size of "1", the container should be enlarged by the
|
|
// unstretched metrics of the fences and separators.
|
|
ApplyUnstretchedMetrics(this, drawTarget,
|
|
fontSizeInflation, mOpenChar,
|
|
containerSize, isRTL);
|
|
for (i = 0; i < mSeparatorsCount; i++) {
|
|
ApplyUnstretchedMetrics(this, drawTarget,
|
|
fontSizeInflation, &mSeparatorsChar[i],
|
|
containerSize, isRTL);
|
|
}
|
|
ApplyUnstretchedMetrics(this, drawTarget,
|
|
fontSizeInflation, mCloseChar,
|
|
containerSize, isRTL);
|
|
|
|
//////////////////////////////////////////
|
|
// Prepare the opening fence, separators, and closing fence, and
|
|
// adjust the origin of children.
|
|
|
|
// we need to center around the axis
|
|
nscoord delta = std::max(containerSize.ascent - axisHeight,
|
|
containerSize.descent + axisHeight);
|
|
containerSize.ascent = delta + axisHeight;
|
|
containerSize.descent = delta - axisHeight;
|
|
|
|
/////////////////
|
|
// opening fence ...
|
|
ReflowChar(drawTarget, *fm,
|
|
fontSizeInflation, mOpenChar,
|
|
NS_MATHML_OPERATOR_FORM_PREFIX, font->mScriptLevel,
|
|
axisHeight, leading, em, containerSize, ascent, descent, isRTL);
|
|
/////////////////
|
|
// separators ...
|
|
for (i = 0; i < mSeparatorsCount; i++) {
|
|
ReflowChar(drawTarget, *fm,
|
|
fontSizeInflation, &mSeparatorsChar[i],
|
|
NS_MATHML_OPERATOR_FORM_INFIX, font->mScriptLevel,
|
|
axisHeight, leading, em, containerSize, ascent, descent, isRTL);
|
|
}
|
|
/////////////////
|
|
// closing fence ...
|
|
ReflowChar(drawTarget, *fm,
|
|
fontSizeInflation, mCloseChar,
|
|
NS_MATHML_OPERATOR_FORM_POSTFIX, font->mScriptLevel,
|
|
axisHeight, leading, em, containerSize, ascent, descent, isRTL);
|
|
|
|
//////////////////
|
|
// Adjust the origins of each child.
|
|
// and update our bounding metrics
|
|
|
|
i = 0;
|
|
nscoord dx = 0;
|
|
nsBoundingMetrics bm;
|
|
bool firstTime = true;
|
|
nsMathMLChar *leftChar, *rightChar;
|
|
if (isRTL) {
|
|
leftChar = mCloseChar;
|
|
rightChar = mOpenChar;
|
|
} else {
|
|
leftChar = mOpenChar;
|
|
rightChar = mCloseChar;
|
|
}
|
|
|
|
if (leftChar) {
|
|
PlaceChar(leftChar, ascent, bm, dx);
|
|
aDesiredSize.mBoundingMetrics = bm;
|
|
firstTime = false;
|
|
}
|
|
|
|
if (isRTL) {
|
|
childFrame = this->GetChildList(nsIFrame::kPrincipalList).LastChild();
|
|
} else {
|
|
childFrame = firstChild;
|
|
}
|
|
while (childFrame) {
|
|
ReflowOutput childSize(aReflowInput);
|
|
GetReflowAndBoundingMetricsFor(childFrame, childSize, bm);
|
|
if (firstTime) {
|
|
firstTime = false;
|
|
aDesiredSize.mBoundingMetrics = bm;
|
|
}
|
|
else
|
|
aDesiredSize.mBoundingMetrics += bm;
|
|
|
|
FinishReflowChild(childFrame, aPresContext, childSize, nullptr,
|
|
dx, ascent - childSize.BlockStartAscent(), 0);
|
|
dx += childSize.Width();
|
|
|
|
if (i < mSeparatorsCount) {
|
|
PlaceChar(&mSeparatorsChar[isRTL ? mSeparatorsCount - 1 - i : i],
|
|
ascent, bm, dx);
|
|
aDesiredSize.mBoundingMetrics += bm;
|
|
}
|
|
i++;
|
|
|
|
if (isRTL) {
|
|
childFrame = childFrame->GetPrevSibling();
|
|
} else {
|
|
childFrame = childFrame->GetNextSibling();
|
|
}
|
|
}
|
|
|
|
if (rightChar) {
|
|
PlaceChar(rightChar, ascent, bm, dx);
|
|
if (firstTime)
|
|
aDesiredSize.mBoundingMetrics = bm;
|
|
else
|
|
aDesiredSize.mBoundingMetrics += bm;
|
|
}
|
|
|
|
aDesiredSize.Width() = aDesiredSize.mBoundingMetrics.width;
|
|
aDesiredSize.Height() = ascent + descent;
|
|
aDesiredSize.SetBlockStartAscent(ascent);
|
|
|
|
SetBoundingMetrics(aDesiredSize.mBoundingMetrics);
|
|
SetReference(nsPoint(0, aDesiredSize.BlockStartAscent()));
|
|
|
|
// see if we should fix the spacing
|
|
FixInterFrameSpacing(aDesiredSize);
|
|
|
|
// Finished with these:
|
|
ClearSavedChildMetrics();
|
|
|
|
// Set our overflow area
|
|
GatherAndStoreOverflow(&aDesiredSize);
|
|
|
|
MOZ_ASSERT(aStatus.IsEmpty(), "This type of frame can't be split.");
|
|
NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
|
|
}
|
|
|
|
static void
|
|
GetCharSpacing(nsMathMLChar* aMathMLChar,
|
|
nsOperatorFlags aForm,
|
|
int32_t aScriptLevel,
|
|
nscoord em,
|
|
nscoord& aLeftSpace,
|
|
nscoord& aRightSpace)
|
|
{
|
|
nsAutoString data;
|
|
aMathMLChar->GetData(data);
|
|
nsOperatorFlags flags = 0;
|
|
float lspace = 0.0f;
|
|
float rspace = 0.0f;
|
|
bool found = nsMathMLOperators::LookupOperator(data, aForm,
|
|
&flags, &lspace, &rspace);
|
|
|
|
// We don't want extra space when we are a script
|
|
if (found && aScriptLevel > 0) {
|
|
lspace /= 2.0f;
|
|
rspace /= 2.0f;
|
|
}
|
|
|
|
aLeftSpace = NSToCoordRound(lspace * em);
|
|
aRightSpace = NSToCoordRound(rspace * em);
|
|
}
|
|
|
|
// helper functions to perform the common task of formatting our chars
|
|
nsresult
|
|
nsMathMLmfencedFrame::ReflowChar(DrawTarget* aDrawTarget,
|
|
nsFontMetrics& aFontMetrics,
|
|
float aFontSizeInflation,
|
|
nsMathMLChar* aMathMLChar,
|
|
nsOperatorFlags aForm,
|
|
int32_t aScriptLevel,
|
|
nscoord axisHeight,
|
|
nscoord leading,
|
|
nscoord em,
|
|
nsBoundingMetrics& aContainerSize,
|
|
nscoord& aAscent,
|
|
nscoord& aDescent,
|
|
bool aRTL)
|
|
{
|
|
if (aMathMLChar && 0 < aMathMLChar->Length()) {
|
|
nscoord leftSpace;
|
|
nscoord rightSpace;
|
|
GetCharSpacing(aMathMLChar, aForm, aScriptLevel, em, leftSpace, rightSpace);
|
|
|
|
// stretch the char to the appropriate height if it is not big enough.
|
|
nsBoundingMetrics charSize;
|
|
nsresult res = aMathMLChar->Stretch(this, aDrawTarget,
|
|
aFontSizeInflation,
|
|
NS_STRETCH_DIRECTION_VERTICAL,
|
|
aContainerSize, charSize,
|
|
NS_STRETCH_NORMAL, aRTL);
|
|
|
|
if (NS_STRETCH_DIRECTION_UNSUPPORTED != aMathMLChar->GetStretchDirection()) {
|
|
// has changed... so center the char around the axis
|
|
nscoord height = charSize.ascent + charSize.descent;
|
|
charSize.ascent = height/2 + axisHeight;
|
|
charSize.descent = height - charSize.ascent;
|
|
}
|
|
else {
|
|
// either it hasn't changed or stretching the char failed (i.e.,
|
|
// nsLayoutUtils::AppUnitBoundsOfString failed)
|
|
leading = 0;
|
|
if (NS_FAILED(res)) {
|
|
nsAutoString data;
|
|
aMathMLChar->GetData(data);
|
|
nsBoundingMetrics metrics =
|
|
nsLayoutUtils::AppUnitBoundsOfString(data.get(), data.Length(),
|
|
aFontMetrics, aDrawTarget);
|
|
charSize.ascent = metrics.ascent;
|
|
charSize.descent = metrics.descent;
|
|
charSize.width = metrics.width;
|
|
// Set this as the bounding metrics of the MathMLChar to leave
|
|
// the necessary room to paint the char.
|
|
aMathMLChar->SetBoundingMetrics(charSize);
|
|
}
|
|
}
|
|
|
|
if (aAscent < charSize.ascent + leading)
|
|
aAscent = charSize.ascent + leading;
|
|
if (aDescent < charSize.descent + leading)
|
|
aDescent = charSize.descent + leading;
|
|
|
|
// account the spacing
|
|
charSize.width += leftSpace + rightSpace;
|
|
|
|
// x-origin is used to store lspace ...
|
|
// y-origin is used to stored the ascent ...
|
|
aMathMLChar->SetRect(nsRect(leftSpace,
|
|
charSize.ascent, charSize.width,
|
|
charSize.ascent + charSize.descent));
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
/*static*/ void
|
|
nsMathMLmfencedFrame::PlaceChar(nsMathMLChar* aMathMLChar,
|
|
nscoord aDesiredAscent,
|
|
nsBoundingMetrics& bm,
|
|
nscoord& dx)
|
|
{
|
|
aMathMLChar->GetBoundingMetrics(bm);
|
|
|
|
// the char's x-origin was used to store lspace ...
|
|
// the char's y-origin was used to store the ascent ...
|
|
// the char's width was used to store the advance with (with spacing) ...
|
|
nsRect rect;
|
|
aMathMLChar->GetRect(rect);
|
|
|
|
nscoord dy = aDesiredAscent - rect.y;
|
|
if (aMathMLChar->GetStretchDirection() != NS_STRETCH_DIRECTION_UNSUPPORTED) {
|
|
// the stretchy char will be centered around the axis
|
|
// so we adjust the returned bounding metrics accordingly
|
|
bm.descent = (bm.ascent + bm.descent) - rect.y;
|
|
bm.ascent = rect.y;
|
|
}
|
|
|
|
aMathMLChar->SetRect(nsRect(dx + rect.x, dy, bm.width, rect.height));
|
|
|
|
bm.leftBearing += rect.x;
|
|
bm.rightBearing += rect.x;
|
|
|
|
// return rect.width since it includes lspace and rspace
|
|
bm.width = rect.width;
|
|
dx += rect.width;
|
|
}
|
|
|
|
static nscoord
|
|
GetMaxCharWidth(nsIFrame* aFrame,
|
|
DrawTarget* aDrawTarget,
|
|
float aFontSizeInflation,
|
|
nsMathMLChar* aMathMLChar,
|
|
nsOperatorFlags aForm,
|
|
int32_t aScriptLevel,
|
|
nscoord em)
|
|
{
|
|
nscoord width = aMathMLChar->GetMaxWidth(aFrame, aDrawTarget,
|
|
aFontSizeInflation);
|
|
|
|
if (0 < aMathMLChar->Length()) {
|
|
nscoord leftSpace;
|
|
nscoord rightSpace;
|
|
GetCharSpacing(aMathMLChar, aForm, aScriptLevel, em, leftSpace, rightSpace);
|
|
|
|
width += leftSpace + rightSpace;
|
|
}
|
|
|
|
return width;
|
|
}
|
|
|
|
/* virtual */ void
|
|
nsMathMLmfencedFrame::GetIntrinsicISizeMetrics(gfxContext* aRenderingContext, ReflowOutput& aDesiredSize)
|
|
{
|
|
nscoord width = 0;
|
|
|
|
const nsStyleFont* font = StyleFont();
|
|
float fontSizeInflation = nsLayoutUtils:: FontSizeInflationFor(this);
|
|
RefPtr<nsFontMetrics> fm =
|
|
nsLayoutUtils::GetFontMetricsForFrame(this, fontSizeInflation);
|
|
nscoord em;
|
|
GetEmHeight(fm, em);
|
|
|
|
if (mOpenChar) {
|
|
width +=
|
|
GetMaxCharWidth(this, aRenderingContext->GetDrawTarget(),
|
|
fontSizeInflation, mOpenChar,
|
|
NS_MATHML_OPERATOR_FORM_PREFIX, font->mScriptLevel, em);
|
|
}
|
|
|
|
int32_t i = 0;
|
|
for (nsIFrame* childFrame : PrincipalChildList()) {
|
|
// XXX This includes margin while Reflow currently doesn't consider
|
|
// margin, so we may end up with too much space, but, with stretchy
|
|
// characters, this is an approximation anyway.
|
|
width += nsLayoutUtils::IntrinsicForContainer(aRenderingContext, childFrame,
|
|
nsLayoutUtils::PREF_ISIZE);
|
|
|
|
if (i < mSeparatorsCount) {
|
|
width +=
|
|
GetMaxCharWidth(this, aRenderingContext->GetDrawTarget(),
|
|
fontSizeInflation, &mSeparatorsChar[i],
|
|
NS_MATHML_OPERATOR_FORM_INFIX, font->mScriptLevel, em);
|
|
}
|
|
i++;
|
|
}
|
|
|
|
if (mCloseChar) {
|
|
width +=
|
|
GetMaxCharWidth(this, aRenderingContext->GetDrawTarget(),
|
|
fontSizeInflation, mCloseChar,
|
|
NS_MATHML_OPERATOR_FORM_POSTFIX, font->mScriptLevel, em);
|
|
}
|
|
|
|
aDesiredSize.Width() = width;
|
|
aDesiredSize.mBoundingMetrics.width = width;
|
|
aDesiredSize.mBoundingMetrics.leftBearing = 0;
|
|
aDesiredSize.mBoundingMetrics.rightBearing = width;
|
|
}
|
|
|
|
nscoord
|
|
nsMathMLmfencedFrame::FixInterFrameSpacing(ReflowOutput& aDesiredSize)
|
|
{
|
|
nscoord gap = nsMathMLContainerFrame::FixInterFrameSpacing(aDesiredSize);
|
|
if (!gap) return 0;
|
|
|
|
nsRect rect;
|
|
if (mOpenChar) {
|
|
mOpenChar->GetRect(rect);
|
|
rect.MoveBy(gap, 0);
|
|
mOpenChar->SetRect(rect);
|
|
}
|
|
if (mCloseChar) {
|
|
mCloseChar->GetRect(rect);
|
|
rect.MoveBy(gap, 0);
|
|
mCloseChar->SetRect(rect);
|
|
}
|
|
for (int32_t i = 0; i < mSeparatorsCount; i++) {
|
|
mSeparatorsChar[i].GetRect(rect);
|
|
rect.MoveBy(gap, 0);
|
|
mSeparatorsChar[i].SetRect(rect);
|
|
}
|
|
return gap;
|
|
}
|
|
|
|
// ----------------------
|
|
// the Style System will use these to pass the proper ComputedStyle to our
|
|
// MathMLChar
|
|
ComputedStyle*
|
|
nsMathMLmfencedFrame::GetAdditionalComputedStyle(int32_t aIndex) const
|
|
{
|
|
int32_t openIndex = -1;
|
|
int32_t closeIndex = -1;
|
|
int32_t lastIndex = mSeparatorsCount-1;
|
|
|
|
if (mOpenChar) {
|
|
lastIndex++;
|
|
openIndex = lastIndex;
|
|
}
|
|
if (mCloseChar) {
|
|
lastIndex++;
|
|
closeIndex = lastIndex;
|
|
}
|
|
if (aIndex < 0 || aIndex > lastIndex) {
|
|
return nullptr;
|
|
}
|
|
|
|
if (aIndex < mSeparatorsCount) {
|
|
return mSeparatorsChar[aIndex].GetComputedStyle();
|
|
}
|
|
else if (aIndex == openIndex) {
|
|
return mOpenChar->GetComputedStyle();
|
|
}
|
|
else if (aIndex == closeIndex) {
|
|
return mCloseChar->GetComputedStyle();
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
void
|
|
nsMathMLmfencedFrame::SetAdditionalComputedStyle(int32_t aIndex,
|
|
ComputedStyle* aComputedStyle)
|
|
{
|
|
int32_t openIndex = -1;
|
|
int32_t closeIndex = -1;
|
|
int32_t lastIndex = mSeparatorsCount-1;
|
|
|
|
if (mOpenChar) {
|
|
lastIndex++;
|
|
openIndex = lastIndex;
|
|
}
|
|
if (mCloseChar) {
|
|
lastIndex++;
|
|
closeIndex = lastIndex;
|
|
}
|
|
if (aIndex < 0 || aIndex > lastIndex) {
|
|
return;
|
|
}
|
|
|
|
if (aIndex < mSeparatorsCount) {
|
|
mSeparatorsChar[aIndex].SetComputedStyle(aComputedStyle);
|
|
}
|
|
else if (aIndex == openIndex) {
|
|
mOpenChar->SetComputedStyle(aComputedStyle);
|
|
}
|
|
else if (aIndex == closeIndex) {
|
|
mCloseChar->SetComputedStyle(aComputedStyle);
|
|
}
|
|
}
|