void RenderListItem::insertOrMoveMarkerRendererIfNeeded()
{
// Sanity check the location of our marker.
if (!m_marker)
return;
RenderElement* currentParent = m_marker->parent();
RenderBlock* newParent = getParentOfFirstLineBox(this, m_marker);
if (!newParent) {
// If the marker is currently contained inside an anonymous box,
// then we are the only item in that anonymous box (since no line box
// parent was found). It's ok to just leave the marker where it is
// in this case.
if (currentParent && currentParent->isAnonymousBlock())
return;
newParent = this;
}
if (newParent != currentParent) {
// Removing and adding the marker can trigger repainting in
// containers other than ourselves, so we need to disable LayoutState.
LayoutStateDisabler layoutStateDisabler(&view());
m_marker->removeFromParent();
newParent->addChild(m_marker, firstNonMarkerChild(newParent));
m_marker->updateMarginsAndContent();
// If current parent is an anonymous block that has lost all its children, destroy it.
if (currentParent && currentParent->isAnonymousBlock() && !currentParent->firstChild() && !toRenderBlock(currentParent)->continuation())
currentParent->destroy();
}
}
void RenderMathMLSubSup::addChild(RenderObject* child, RenderObject* beforeChild)
{
// Note: The RenderMathMLBlock only allows element children to be added.
Element* childElement = toElement(child->node());
if (childElement && !childElement->previousElementSibling()) {
// Position 1 is always the base of the msub/msup/msubsup.
RenderBlock* baseWrapper = createAlmostAnonymousBlock(INLINE_BLOCK);
RenderMathMLBlock::addChild(baseWrapper, firstChild());
baseWrapper->addChild(child);
// Make sure we have a script block for rendering.
if (m_kind == SubSup && !m_scripts) {
RefPtr<RenderStyle> scriptsStyle = RenderStyle::createAnonymousStyle(style());
scriptsStyle->setDisplay(INLINE_BLOCK);
scriptsStyle->setVerticalAlign(TOP);
scriptsStyle->setMarginLeft(Length(gSubsupScriptMargin, Fixed));
scriptsStyle->setTextAlign(LEFT);
// Set this wrapper's font-size for its line-height & baseline position.
scriptsStyle->setBlendedFontSize(static_cast<int>(0.75 * style()->fontSize()));
m_scripts = new (renderArena()) RenderMathMLBlock(node());
m_scripts->setStyle(scriptsStyle);
RenderMathMLBlock::addChild(m_scripts, beforeChild);
}
} else {
if (m_kind == SubSup) {
ASSERT(childElement);
if (!childElement)
return;
RenderBlock* script = m_scripts->createAlmostAnonymousBlock();
// The order is always backwards so the first script is the subscript and the superscript
// is last. That means the superscript is the first to render vertically.
Element* previousSibling = childElement->previousElementSibling();
if (previousSibling && !previousSibling->previousElementSibling())
m_scripts->addChild(script);
else
m_scripts->addChild(script, m_scripts->firstChild());
script->addChild(child);
} else
RenderMathMLBlock::addChild(child, beforeChild);
}
}
RenderBlock* RenderMathMLOperator::createGlyph(UChar glyph, int lineHeight, int maxHeightForRenderer, int charRelative, int topRelative)
{
RenderBlock* container = new (renderArena()) RenderMathMLBlock(node());
container->setStyle(createStackableStyle(lineHeight, maxHeightForRenderer, topRelative));
addChild(container);
RenderBlock* parent = container;
if (charRelative) {
RenderBlock* charBlock = new (renderArena()) RenderBlock(node());
RefPtr<RenderStyle> charStyle = RenderStyle::create();
charStyle->inheritFrom(container->style());
charStyle->setDisplay(INLINE_BLOCK);
charStyle->setTop(Length(charRelative, Fixed));
charStyle->setPosition(RelativePosition);
charBlock->setStyle(charStyle);
parent->addChild(charBlock);
parent = charBlock;
}
RenderText* text = new (renderArena()) RenderText(node(), StringImpl::create(&glyph, 1));
text->setStyle(container->style());
parent->addChild(text);
return container;
}
RenderBlock* RenderMathMLOperator::createGlyph(UChar glyph, int maxHeightForRenderer, int charRelative)
{
RenderBlock* container = new (renderArena()) RenderMathMLBlock(toElement(node()));
toRenderMathMLBlock(container)->setIgnoreInAccessibilityTree(true);
container->setStyle(createStackableStyle(maxHeightForRenderer));
addChild(container);
RenderBlock* parent = container;
if (charRelative) {
RenderBlock* charBlock = createAnonymous(document());
RefPtr<RenderStyle> charStyle = RenderStyle::create();
charStyle->inheritFrom(container->style());
charStyle->setDisplay(INLINE_BLOCK);
charStyle->setTop(Length(charRelative, Fixed));
charStyle->setPosition(RelativePosition);
charBlock->setStyle(charStyle);
parent->addChild(charBlock);
parent = charBlock;
}
RenderText* text = new (renderArena()) RenderText(node(), StringImpl::create(&glyph, 1));
text->setStyle(container->style());
parent->addChild(text);
return container;
}
void RenderRubyRun::addChild(RenderObject* child, RenderObject* beforeChild)
{
ASSERT(child);
if (child->isRubyText()) {
if (!beforeChild) {
// RenderRuby has already ascertained that we can add the child here.
ASSERT(!hasRubyText());
// prepend ruby texts as first child
RenderBlockFlow::addChild(child, firstChild());
} else if (beforeChild->isRubyText()) {
// New text is inserted just before another.
// In this case the new text takes the place of the old one, and
// the old text goes into a new run that is inserted as next sibling.
ASSERT(beforeChild->parent() == this);
RenderObject* ruby = parent();
ASSERT(ruby->isRuby());
RenderBlock* newRun = staticCreateRubyRun(ruby);
ruby->addChild(newRun, nextSibling());
// Add the new ruby text and move the old one to the new run
// Note: Doing it in this order and not using RenderRubyRun's methods,
// in order to avoid automatic removal of the ruby run in case there is no
// other child besides the old ruby text.
RenderBlockFlow::addChild(child, beforeChild);
RenderBlockFlow::removeChild(beforeChild);
newRun->addChild(beforeChild);
} else if (hasRubyBase()) {
// Insertion before a ruby base object.
// In this case we need insert a new run before the current one and split the base.
RenderObject* ruby = parent();
RenderRubyRun* newRun = staticCreateRubyRun(ruby);
ruby->addChild(newRun, this);
newRun->addChild(child);
rubyBaseSafe()->moveChildren(newRun->rubyBaseSafe(), beforeChild);
}
} else {
// child is not a text -> insert it into the base
// (append it instead if beforeChild is the ruby text)
RenderRubyBase* base = rubyBaseSafe();
if (beforeChild == base)
beforeChild = base->firstChild();
if (beforeChild && beforeChild->isRubyText())
beforeChild = 0;
ASSERT(!beforeChild || beforeChild->isDescendantOf(base));
base->addChild(child, beforeChild);
}
}
void RenderMathMLRoot::addChild(RenderObject* child, RenderObject* )
{
if (isEmpty()) {
// Add a block for the index
RenderBlock* indexWrapper = createAlmostAnonymousBlock(INLINE_BLOCK);
RenderBlock::addChild(indexWrapper);
// FIXME: the wrapping does not seem to be needed anymore.
// this is the base, so wrap it so we can pad it
RenderBlock* baseWrapper = createAlmostAnonymousBlock(INLINE_BLOCK);
baseWrapper->style()->setPaddingLeft(Length(5 * gFrontWidthEms, Percent));
RenderBlock::addChild(baseWrapper);
baseWrapper->addChild(child);
} else {
// always add to the index
firstChild()->addChild(child);
}
}
void RenderListItem::insertOrMoveMarkerRendererIfNeeded()
{
// Sanity check the location of our marker.
if (!m_marker)
return;
// FIXME: Do not even try to reposition the marker when we are not in layout
// until after we fixed webkit.org/b/163789.
if (!view().frameView().isInRenderTreeLayout())
return;
RenderElement* currentParent = m_marker->parent();
RenderBlock* newParent = getParentOfFirstLineBox(*this, *m_marker);
if (!newParent) {
// If the marker is currently contained inside an anonymous box,
// then we are the only item in that anonymous box (since no line box
// parent was found). It's ok to just leave the marker where it is
// in this case.
if (currentParent && currentParent->isAnonymousBlock())
return;
if (multiColumnFlowThread())
newParent = multiColumnFlowThread();
else
newParent = this;
}
if (newParent != currentParent) {
// Removing and adding the marker can trigger repainting in
// containers other than ourselves, so we need to disable LayoutState.
LayoutStateDisabler layoutStateDisabler(view());
// Mark the parent dirty so that when the marker gets inserted into the tree
// and dirties ancestors, it stops at the parent.
newParent->setChildNeedsLayout(MarkOnlyThis);
m_marker->setNeedsLayout(MarkOnlyThis);
m_marker->removeFromParent();
newParent->addChild(m_marker, firstNonMarkerChild(*newParent));
m_marker->updateMarginsAndContent();
// If current parent is an anonymous block that has lost all its children, destroy it.
if (currentParent && currentParent->isAnonymousBlock() && !currentParent->firstChild() && !downcast<RenderBlock>(*currentParent).continuation())
currentParent->destroy();
}
}
void RenderMathMLFenced::addChild(RenderObject* child, RenderObject*)
{
// make the fences if the render object is empty
if (isEmpty())
updateFromElement();
if (m_separators.get()) {
unsigned int count = 0;
for (Node* position = child->node(); position; position = position->previousSibling()) {
if (position->nodeType() == Node::ELEMENT_NODE)
count++;
}
if (count > 1) {
UChar separator;
// Use the last separator if we've run out of specified separators.
if ((count - 1) >= m_separators.get()->length())
separator = (*m_separators.get())[m_separators.get()->length() - 1];
else
separator = (*m_separators.get())[count - 1];
RenderObject* separatorObj = new (renderArena()) RenderMathMLOperator(node(), separator);
separatorObj->setStyle(makeOperatorStyle().release());
RenderBlock::addChild(separatorObj, lastChild());
}
}
// If we have a block, we'll wrap it in an inline-block.
if (child->isBlockFlow() && child->style()->display() != INLINE_BLOCK) {
// Block objects wrapper.
RenderBlock* block = new (renderArena()) RenderBlock(node());
RefPtr<RenderStyle> newStyle = RenderStyle::create();
newStyle->inheritFrom(style());
newStyle->setDisplay(INLINE_BLOCK);
block->setStyle(newStyle.release());
RenderBlock::addChild(block, lastChild());
block->addChild(child);
} else
RenderBlock::addChild(child, lastChild());
}
void RenderMathMLFraction::addChild(RenderObject* child, RenderObject* beforeChild)
{
RenderBlock* row = new (renderArena()) RenderMathMLBlock(node());
RefPtr<RenderStyle> rowStyle = makeBlockStyle();
rowStyle->setTextAlign(CENTER);
Length pad(static_cast<int>(rowStyle->fontSize() * gHorizontalPad), Fixed);
rowStyle->setPaddingLeft(pad);
rowStyle->setPaddingRight(pad);
// Only add padding for rows as denominators
bool isNumerator = isEmpty();
if (!isNumerator)
rowStyle->setPaddingTop(Length(2, Fixed));
row->setStyle(rowStyle.release());
RenderBlock::addChild(row, beforeChild);
row->addChild(child);
updateFromElement();
}
void RenderMathMLSubSup::addChild(RenderObject* child, RenderObject* beforeChild)
{
if (firstChild()) {
// We already have a base, so this is the super/subscripts being added.
if (m_kind == SubSup) {
if (!m_scripts) {
m_scripts = new (renderArena()) RenderMathMLBlock(node());
RefPtr<RenderStyle> scriptsStyle = RenderStyle::create();
scriptsStyle->inheritFrom(style());
scriptsStyle->setDisplay(INLINE_BLOCK);
scriptsStyle->setVerticalAlign(MIDDLE);
scriptsStyle->setMarginLeft(Length(gSubsupScriptMargin, Fixed));
scriptsStyle->setTextAlign(LEFT);
m_scripts->setStyle(scriptsStyle.release());
RenderMathMLBlock::addChild(m_scripts, beforeChild);
}
RenderBlock* script = new (renderArena()) RenderMathMLBlock(node());
RefPtr<RenderStyle> scriptStyle = RenderStyle::create();
scriptStyle->inheritFrom(m_scripts->style());
scriptStyle->setDisplay(BLOCK);
script->setStyle(scriptStyle.release());
m_scripts->addChild(script, m_scripts->firstChild());
script->addChild(child);
} else
RenderMathMLBlock::addChild(child, beforeChild);
} else {
RenderMathMLBlock* wrapper = new (renderArena()) RenderMathMLBlock(node());
RefPtr<RenderStyle> wrapperStyle = RenderStyle::create();
wrapperStyle->inheritFrom(style());
wrapperStyle->setDisplay(INLINE_BLOCK);
wrapperStyle->setVerticalAlign(MIDDLE);
wrapper->setStyle(wrapperStyle.release());
RenderMathMLBlock::addChild(wrapper, beforeChild);
wrapper->addChild(child);
}
}
void RenderMathMLRoot::addChild(RenderObject* child, RenderObject* )
{
if (isEmpty()) {
// Add a block for the index
RenderBlock* block = new (renderArena()) RenderBlock(node());
RefPtr<RenderStyle> indexStyle = makeBlockStyle();
indexStyle->setDisplay(INLINE_BLOCK);
block->setStyle(indexStyle.release());
RenderBlock::addChild(block);
// FIXME: the wrapping does not seem to be needed anymore.
// this is the base, so wrap it so we can pad it
block = new (renderArena()) RenderBlock(node());
RefPtr<RenderStyle> baseStyle = makeBlockStyle();
baseStyle->setDisplay(INLINE_BLOCK);
baseStyle->setPaddingLeft(Length(5 * gRadicalWidth , Percent));
block->setStyle(baseStyle.release());
RenderBlock::addChild(block);
block->addChild(child);
} else {
// always add to the index
firstChild()->addChild(child);
}
}
// FIXME: It's cleaner to only call updateFromElement when an attribute has changed. The body of
// this method should probably be moved to a private stretchHeightChanged or checkStretchHeight
// method. Probably at the same time, addChild/removeChild methods should be made to work for
// dynamic DOM changes.
void RenderMathMLOperator::updateFromElement()
{
RenderObject* savedRenderer = node()->renderer();
// Destroy our current children
children()->destroyLeftoverChildren();
// Since we share a node with our children, destroying our children may set our node's
// renderer to 0, so we need to restore it.
node()->setRenderer(savedRenderer);
// If the operator is fixed, it will be contained in m_operator
UChar firstChar = m_operator;
// This boolean indicates whether stretching is disabled via the markup.
bool stretchDisabled = false;
// We may need the element later if we can't stretch.
if (node()->nodeType() == Node::ELEMENT_NODE) {
if (Element* mo = static_cast<Element*>(node())) {
AtomicString stretchyAttr = mo->getAttribute(MathMLNames::stretchyAttr);
stretchDisabled = equalIgnoringCase(stretchyAttr, "false");
// If stretching isn't disabled, get the character from the text content.
if (!stretchDisabled && !firstChar) {
String opText = mo->textContent();
for (unsigned int i = 0; !firstChar && i < opText.length(); i++) {
if (!isSpaceOrNewline(opText[i]))
firstChar = opText[i];
}
}
}
}
// The 'index' holds the stretchable character's glyph information
int index = -1;
// isStretchy indicates whether the character is streatchable via a number of factors.
bool isStretchy = false;
// Check for a stretchable character.
if (!stretchDisabled && firstChar) {
const int maxIndex = WTF_ARRAY_LENGTH(stretchyCharacters);
for (index++; index < maxIndex; index++) {
if (stretchyCharacters[index].character == firstChar) {
isStretchy = true;
break;
}
}
}
// We only stretch character if the stretch height is larger than a minimum size (e.g. 24px).
bool shouldStretch = isStretchy && m_stretchHeight>gMinimumStretchHeight;
// Either stretch is disabled or we don't have a stretchable character over the minimum height
if (stretchDisabled || !shouldStretch) {
m_isStacked = false;
RenderBlock* container = new (renderArena()) RenderMathMLBlock(node());
RefPtr<RenderStyle> newStyle = RenderStyle::create();
newStyle->inheritFrom(style());
newStyle->setDisplay(INLINE_BLOCK);
newStyle->setVerticalAlign(BASELINE);
// Check for a stretchable character that is under the minimum height and use the
// font size to adjust the glyph size.
int currentFontSize = style()->fontSize();
if (!stretchDisabled && isStretchy && m_stretchHeight > 0 && m_stretchHeight <= gMinimumStretchHeight && m_stretchHeight > currentFontSize) {
FontDescription desc = style()->fontDescription();
desc.setIsAbsoluteSize(true);
desc.setSpecifiedSize(m_stretchHeight);
desc.setComputedSize(m_stretchHeight);
newStyle->setFontDescription(desc);
newStyle->font().update(style()->font().fontSelector());
}
container->setStyle(newStyle.release());
addChild(container);
// Build the text of the operator.
RenderText* text = 0;
if (m_operator)
text = new (renderArena()) RenderText(node(), StringImpl::create(&m_operator, 1));
else if (node()->nodeType() == Node::ELEMENT_NODE)
if (Element* mo = static_cast<Element*>(node()))
text = new (renderArena()) RenderText(node(), mo->textContent().replace(hyphenMinus, minusSign).impl());
// If we can't figure out the text, leave it blank.
if (text) {
RefPtr<RenderStyle> textStyle = RenderStyle::create();
textStyle->inheritFrom(container->style());
text->setStyle(textStyle.release());
container->addChild(text);
}
} else {
// Build stretchable characters as a stack of glyphs.
m_isStacked = true;
int extensionGlyphLineHeight = lineHeightForCharacter(stretchyCharacters[index].extensionGlyph);
int topGlyphLineHeight = lineHeightForCharacter(stretchyCharacters[index].topGlyph);
int bottomGlyphLineHeight = lineHeightForCharacter(stretchyCharacters[index].bottomGlyph);
if (stretchyCharacters[index].middleGlyph) {
// We have a middle glyph (e.g. a curly bracket) that requires special processing.
int glyphHeight = glyphHeightForCharacter(stretchyCharacters[index].middleGlyph);
int middleGlyphLineHeight = lineHeightForCharacter(stretchyCharacters[index].middleGlyph);
int half = (m_stretchHeight - glyphHeight) / 2;
if (half <= glyphHeight) {
// We only have enough space for a single middle glyph.
createGlyph(stretchyCharacters[index].topGlyph, topGlyphLineHeight, half, gTopGlyphTopAdjust);
createGlyph(stretchyCharacters[index].middleGlyph, middleGlyphLineHeight, glyphHeight, gMiddleGlyphTopAdjust);
createGlyph(stretchyCharacters[index].bottomGlyph, bottomGlyphLineHeight, 0, gBottomGlyphTopAdjust);
} else {
// We have to extend both the top and bottom to the middle.
createGlyph(stretchyCharacters[index].topGlyph, topGlyphLineHeight, glyphHeight, gTopGlyphTopAdjust);
int remaining = half - glyphHeight;
while (remaining > 0) {
if (remaining < glyphHeight) {
createGlyph(stretchyCharacters[index].extensionGlyph, extensionGlyphLineHeight, remaining);
remaining = 0;
} else {
createGlyph(stretchyCharacters[index].extensionGlyph, extensionGlyphLineHeight, glyphHeight);
remaining -= glyphHeight;
}
}
// The middle glyph in the stack.
createGlyph(stretchyCharacters[index].middleGlyph, middleGlyphLineHeight, glyphHeight, gMiddleGlyphTopAdjust);
// The remaining is the top half minus the middle glyph height.
remaining = half - glyphHeight;
// We need to make sure we have the full height in case the height is odd.
if (m_stretchHeight % 2 == 1)
remaining++;
// Extend to the bottom glyph.
while (remaining > 0) {
if (remaining < glyphHeight) {
createGlyph(stretchyCharacters[index].extensionGlyph, extensionGlyphLineHeight, remaining);
remaining = 0;
} else {
createGlyph(stretchyCharacters[index].extensionGlyph, extensionGlyphLineHeight, glyphHeight);
remaining -= glyphHeight;
}
}
// The bottom glyph in the stack.
createGlyph(stretchyCharacters[index].bottomGlyph, bottomGlyphLineHeight, 0, gBottomGlyphTopAdjust);
}
} else {
// We do not have a middle glyph and so we just extend from the top to the bottom glyph.
int glyphHeight = glyphHeightForCharacter(stretchyCharacters[index].extensionGlyph);
int remaining = m_stretchHeight - 2 * glyphHeight;
createGlyph(stretchyCharacters[index].topGlyph, topGlyphLineHeight, glyphHeight, gTopGlyphTopAdjust);
while (remaining > 0) {
if (remaining < glyphHeight) {
createGlyph(stretchyCharacters[index].extensionGlyph, extensionGlyphLineHeight, remaining);
remaining = 0;
} else {
createGlyph(stretchyCharacters[index].extensionGlyph, extensionGlyphLineHeight, glyphHeight);
remaining -= glyphHeight;
}
}
createGlyph(stretchyCharacters[index].bottomGlyph, bottomGlyphLineHeight, 0, gBottomGlyphTopAdjust);
}
}
setNeedsLayoutAndPrefWidthsRecalc();
}
void RenderRubyAsBlock::addChild(RenderObject* child, RenderObject* beforeChild)
{
// Insert :before and :after content before/after the RenderRubyRun(s)
if (child->isBeforeContent()) {
if (child->isInline()) {
// Add generated inline content normally
RenderBlock::addChild(child, firstChild());
} else {
// Wrap non-inline content with an anonymous inline-block.
RenderBlock* beforeBlock = rubyBeforeBlock(this);
if (!beforeBlock) {
beforeBlock = createAnonymousRubyInlineBlock(this);
RenderBlock::addChild(beforeBlock, firstChild());
}
beforeBlock->addChild(child);
}
return;
}
if (child->isAfterContent()) {
if (child->isInline()) {
// Add generated inline content normally
RenderBlock::addChild(child);
} else {
// Wrap non-inline content with an anonymous inline-block.
RenderBlock* afterBlock = rubyAfterBlock(this);
if (!afterBlock) {
afterBlock = createAnonymousRubyInlineBlock(this);
RenderBlock::addChild(afterBlock);
}
afterBlock->addChild(child);
}
return;
}
// If the child is a ruby run, just add it normally.
if (child->isRubyRun()) {
RenderBlock::addChild(child, beforeChild);
return;
}
if (beforeChild && !isAfterContent(beforeChild)) {
// insert child into run
ASSERT(!beforeChild->isRubyRun());
RenderObject* run = beforeChild;
while (run && !run->isRubyRun())
run = run->parent();
if (run) {
run->addChild(child, beforeChild);
return;
}
ASSERT_NOT_REACHED(); // beforeChild should always have a run as parent!
// Emergency fallback: fall through and just append.
}
// If the new child would be appended, try to add the child to the previous run
// if possible, or create a new run otherwise.
// (The RenderRubyRun object will handle the details)
RenderRubyRun* lastRun = lastRubyRun(this);
if (!lastRun || lastRun->hasRubyText()) {
lastRun = RenderRubyRun::staticCreateRubyRun(this);
RenderBlock::addChild(lastRun, beforeChild);
}
lastRun->addChild(child);
}
// FIXME: It's cleaner to only call updateFromElement when an attribute has changed. The body of
// this method should probably be moved to a private stretchHeightChanged or checkStretchHeight
// method. Probably at the same time, addChild/removeChild methods should be made to work for
// dynamic DOM changes.
void RenderMathMLOperator::updateFromElement()
{
RenderObject* savedRenderer = node()->renderer();
// Destroy our current children
children()->destroyLeftoverChildren();
// Since we share a node with our children, destroying our children may set our node's
// renderer to 0, so we need to restore it.
node()->setRenderer(savedRenderer);
int index = stretchyCharacterIndex();
bool isStretchy = index >= 0;
// We only stack glyphs if the stretch height is larger than a minimum size.
bool shouldStack = isStretchy && m_stretchHeight > style()->fontSize();
struct StretchyCharacter* partsData = 0;
float topGlyphHeight = 0;
float extensionGlyphHeight = 0;
float bottomGlyphHeight = 0;
float middleGlyphHeight = 0;
if (isStretchy) {
partsData = &stretchyCharacters[index];
FontCachePurgePreventer fontCachePurgePreventer;
topGlyphHeight = glyphHeightForCharacter(partsData->topGlyph);
extensionGlyphHeight = glyphHeightForCharacter(partsData->extensionGlyph) - 1;
bottomGlyphHeight = glyphHeightForCharacter(partsData->bottomGlyph);
if (partsData->middleGlyph)
middleGlyphHeight = glyphHeightForCharacter(partsData->middleGlyph) - 1;
shouldStack = m_stretchHeight >= topGlyphHeight + middleGlyphHeight + bottomGlyphHeight && extensionGlyphHeight > 0;
}
bool stretchDisabled = stretchDisabledByMarkup();
// Either stretch is disabled or we don't have a stretchable character over the minimum height
if (stretchDisabled || !shouldStack) {
RenderBlock* container = new (renderArena()) RenderMathMLBlock(toElement(node()));
toRenderMathMLBlock(container)->setIgnoreInAccessibilityTree(true);
RefPtr<RenderStyle> newStyle = RenderStyle::create();
newStyle->inheritFrom(style());
newStyle->setDisplay(FLEX);
newStyle->setJustifyContent(JustifyCenter);
UChar firstCharacter = firstTextCharacter();
m_isStretched = firstCharacter && isStretchy && m_stretchHeight > style()->fontMetrics().floatHeight();
if (m_isStretched)
newStyle->setHeight(Length(m_stretchHeight, Fixed));
container->setStyle(newStyle.release());
addChild(container);
if (m_isStretched) {
float scaleY = m_stretchHeight / glyphHeightForCharacter(firstCharacter);
TransformOperations transform;
transform.operations().append(ScaleTransformOperation::create(1.0, scaleY, ScaleTransformOperation::SCALE_X));
RefPtr<RenderStyle> innerStyle = RenderStyle::create();
innerStyle->inheritFrom(style());
innerStyle->setTransform(transform);
innerStyle->setTransformOriginY(Length(0, Fixed));
RenderBlock* innerContainer = new (renderArena()) RenderMathMLBlock(toElement(node()));
toRenderMathMLBlock(innerContainer)->setIgnoreInAccessibilityTree(true);
innerContainer->setStyle(innerStyle);
container->addChild(innerContainer);
container = innerContainer;
}
// Build the text of the operator.
RenderText* text = 0;
if (m_operator)
text = new (renderArena()) RenderText(node(), StringImpl::create(&m_operator, 1));
else if (node()->isElementNode())
if (Element* mo = static_cast<Element*>(node()))
text = new (renderArena()) RenderText(node(), mo->textContent().replace(hyphenMinus, minusSign).impl());
// If we can't figure out the text, leave it blank.
if (text) {
RefPtr<RenderStyle> textStyle = RenderStyle::create();
textStyle->inheritFrom(container->style());
text->setStyle(textStyle.release());
container->addChild(text);
}
} else {
// Build stretchable characters as a stack of glyphs.
m_isStretched = true;
// To avoid gaps, we position glyphs after the top glyph upward by 1px. We also truncate
// glyph heights to ints, and then reduce all but the top & bottom such heights by 1px.
int remaining = m_stretchHeight - topGlyphHeight - bottomGlyphHeight;
createGlyph(partsData->topGlyph, topGlyphHeight, 0);
if (partsData->middleGlyph) {
// We have a middle glyph (e.g. a curly bracket) that requires special processing.
remaining -= middleGlyphHeight;
int half = (remaining + 1) / 2;
remaining -= half;
while (remaining > 0) {
int height = std::min<int>(remaining, extensionGlyphHeight);
createGlyph(partsData->extensionGlyph, height, -1);
remaining -= height;
}
// The middle glyph in the stack.
createGlyph(partsData->middleGlyph, middleGlyphHeight, -1);
remaining = half;
while (remaining > 0) {
int height = std::min<int>(remaining, extensionGlyphHeight);
createGlyph(partsData->extensionGlyph, height, -1);
remaining -= height;
}
} else {
// We do not have a middle glyph and so we just extend from the top to the bottom glyph.
while (remaining > 0) {
int height = std::min<int>(remaining, extensionGlyphHeight);
createGlyph(partsData->extensionGlyph, height, -1);
remaining -= height;
}
}
createGlyph(partsData->bottomGlyph, bottomGlyphHeight, -1);
}
setNeedsLayoutAndPrefWidthsRecalc();
}
// FIXME: It's cleaner to only call updateFromElement when an attribute has changed. The body of
// this method should probably be moved to a private stretchHeightChanged or checkStretchHeight
// method. Probably at the same time, addChild/removeChild methods should be made to work for
// dynamic DOM changes.
void RenderMathMLOperator::updateFromElement()
{
RenderObject* savedRenderer = node()->renderer();
// Destroy our current children
children()->destroyLeftoverChildren();
// Since we share a node with our children, destroying our children may set our node's
// renderer to 0, so we need to restore it.
node()->setRenderer(savedRenderer);
// If the operator is fixed, it will be contained in m_operator
UChar firstChar = m_operator;
// This boolean indicates whether stretching is disabled via the markup.
bool stretchDisabled = false;
// We may need the element later if we can't stretch.
if (node()->isElementNode()) {
if (Element* mo = toElement(node())) {
AtomicString stretchyAttr = mo->getAttribute(MathMLNames::stretchyAttr);
stretchDisabled = equalIgnoringCase(stretchyAttr, "false");
// If stretching isn't disabled, get the character from the text content.
if (!stretchDisabled && !firstChar) {
String opText = mo->textContent();
for (unsigned int i = 0; !firstChar && i < opText.length(); i++) {
if (!isSpaceOrNewline(opText[i]))
firstChar = opText[i];
}
}
}
}
// The 'index' holds the stretchable character's glyph information
int index = -1;
// isStretchy indicates whether the character is streatchable via a number of factors.
bool isStretchy = false;
// Check for a stretchable character.
if (!stretchDisabled && firstChar) {
const int maxIndex = WTF_ARRAY_LENGTH(stretchyCharacters);
for (index++; index < maxIndex; index++) {
if (stretchyCharacters[index].character == firstChar) {
isStretchy = true;
break;
}
}
}
// We only stack glyphs if the stretch height is larger than a minimum size.
bool shouldStack = isStretchy && m_stretchHeight > style()->fontSize();
struct StretchyCharacter* partsData = 0;
int topGlyphHeight = 0;
int extensionGlyphHeight = 0;
int bottomGlyphHeight = 0;
int middleGlyphHeight = 0;
if (shouldStack) {
partsData = &stretchyCharacters[index];
FontCachePurgePreventer fontCachePurgePreventer;
topGlyphHeight = glyphHeightForCharacter(partsData->topGlyph);
extensionGlyphHeight = glyphHeightForCharacter(partsData->extensionGlyph) - 1;
bottomGlyphHeight = glyphHeightForCharacter(partsData->bottomGlyph);
if (partsData->middleGlyph)
middleGlyphHeight = glyphHeightForCharacter(partsData->middleGlyph) - 1;
shouldStack = m_stretchHeight >= topGlyphHeight + middleGlyphHeight + bottomGlyphHeight && extensionGlyphHeight > 0;
}
// Either stretch is disabled or we don't have a stretchable character over the minimum height
if (stretchDisabled || !shouldStack) {
m_isStacked = false;
RenderBlock* container = new (renderArena()) RenderMathMLBlock(toElement(node()));
// This container doesn't offer any useful information to accessibility.
toRenderMathMLBlock(container)->setIgnoreInAccessibilityTree(true);
RefPtr<RenderStyle> newStyle = RenderStyle::create();
newStyle->inheritFrom(style());
newStyle->setDisplay(FLEX);
// Check for a stretchable character that is under the minimum height.
if (!stretchDisabled && isStretchy && m_stretchHeight > style()->fontSize()) {
FontDescription desc = style()->fontDescription();
desc.setIsAbsoluteSize(true);
desc.setSpecifiedSize(m_stretchHeight);
desc.setComputedSize(m_stretchHeight);
newStyle->setFontDescription(desc);
newStyle->font().update(style()->font().fontSelector());
}
container->setStyle(newStyle.release());
addChild(container);
// Build the text of the operator.
RenderText* text = 0;
if (m_operator)
text = new (renderArena()) RenderText(node(), StringImpl::create(&m_operator, 1));
else if (node()->isElementNode())
if (Element* mo = toElement(node()))
text = new (renderArena()) RenderText(node(), mo->textContent().replace(hyphenMinus, minusSign).impl());
// If we can't figure out the text, leave it blank.
if (text) {
RefPtr<RenderStyle> textStyle = RenderStyle::create();
textStyle->inheritFrom(container->style());
text->setStyle(textStyle.release());
container->addChild(text);
}
} else {
// Build stretchable characters as a stack of glyphs.
m_isStacked = true;
// To avoid gaps, we position glyphs after the top glyph upward by 1px. We also truncate
// glyph heights to ints, and then reduce all but the top & bottom such heights by 1px.
int remaining = m_stretchHeight - topGlyphHeight - bottomGlyphHeight;
createGlyph(partsData->topGlyph, topGlyphHeight, 0);
if (partsData->middleGlyph) {
// We have a middle glyph (e.g. a curly bracket) that requires special processing.
remaining -= middleGlyphHeight;
int half = (remaining + 1) / 2;
remaining -= half;
while (remaining > 0) {
int height = std::min<int>(remaining, extensionGlyphHeight);
createGlyph(partsData->extensionGlyph, height, -1);
remaining -= height;
}
// The middle glyph in the stack.
createGlyph(partsData->middleGlyph, middleGlyphHeight, -1);
remaining = half;
while (remaining > 0) {
int height = std::min<int>(remaining, extensionGlyphHeight);
createGlyph(partsData->extensionGlyph, height, -1);
remaining -= height;
}
} else {
// We do not have a middle glyph and so we just extend from the top to the bottom glyph.
while (remaining > 0) {
int height = std::min<int>(remaining, extensionGlyphHeight);
createGlyph(partsData->extensionGlyph, height, -1);
remaining -= height;
}
}
createGlyph(partsData->bottomGlyph, bottomGlyphHeight, -1);
}
setNeedsLayoutAndPrefWidthsRecalc();
}