// 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()
{
RenderElement* savedRenderer = element().renderer();
// Destroy our current 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.
element().setRenderer(savedRenderer);
RefPtr<RenderStyle> newStyle = RenderStyle::create();
newStyle->inheritFrom(style());
newStyle->setDisplay(FLEX);
RenderMathMLBlock* container = new RenderMathMLBlock(element());
// This container doesn't offer any useful information to accessibility.
container->setIgnoreInAccessibilityTree(true);
container->setStyle(newStyle.release());
addChild(container);
RenderText* text;
if (m_operator)
text = new RenderText(document(), String(&m_operator, 1));
else
text = new RenderText(document(), element().textContent().replace(hyphenMinus, minusSign).impl());
// If we can't figure out the text, leave it blank.
if (text)
container->addChild(text);
updateStyle();
setNeedsLayoutAndPrefWidthsRecalc();
}
RenderMathMLBlock* RenderMathMLBlock::createAnonymousMathMLBlock(EDisplay display)
{
RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(style(), display);
RenderMathMLBlock* newBlock = new (renderArena()) RenderMathMLBlock(0);
newBlock->setDocumentForAnonymous(document());
newBlock->setStyle(newStyle.release());
return newBlock;
}
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.
RenderMathMLBlock* wrapper = new (renderArena()) RenderMathMLBlock(node());
RefPtr<RenderStyle> wrapperStyle = RenderStyle::create();
wrapperStyle->inheritFrom(style());
wrapperStyle->setDisplay(INLINE_BLOCK);
wrapperStyle->setVerticalAlign(BASELINE);
wrapper->setStyle(wrapperStyle.release());
RenderMathMLBlock::addChild(wrapper, firstChild());
wrapper->addChild(child);
// Make sure we have a script block for rendering.
if (m_kind == SubSup && !m_scripts) {
m_scripts = new (renderArena()) RenderMathMLBlock(node());
RefPtr<RenderStyle> scriptsStyle = RenderStyle::create();
scriptsStyle->inheritFrom(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->setStyle(scriptsStyle.release());
RenderMathMLBlock::addChild(m_scripts, beforeChild);
}
} else {
if (m_kind == SubSup) {
ASSERT(childElement);
if (!childElement)
return;
RenderBlock* script = new (renderArena()) RenderMathMLBlock(node());
RefPtr<RenderStyle> scriptStyle = RenderStyle::create();
scriptStyle->inheritFrom(m_scripts->style());
scriptStyle->setDisplay(BLOCK);
script->setStyle(scriptStyle.release());
// 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);
}
}
void RenderMathMLUnderOver::addChild(RenderObject* child, RenderObject* beforeChild)
{
RenderMathMLBlock* row = new (renderArena()) RenderMathMLBlock(node());
RefPtr<RenderStyle> rowStyle = createBlockStyle();
row->setStyle(rowStyle.release());
row->setIsAnonymous(true);
// look through the children for rendered elements counting the blocks so we know what child
// we are adding
int blocks = 0;
RenderObject* current = this->firstChild();
while (current) {
blocks++;
current = current->nextSibling();
}
switch (blocks) {
case 0:
// this is the base so just append it
RenderBlock::addChild(row, beforeChild);
break;
case 1:
// the under or over
// FIXME: text-align: center does not work
row->style()->setTextAlign(CENTER);
if (m_kind == Over) {
// add the over as first
RenderBlock::addChild(row, firstChild());
} else {
// add the under as last
RenderBlock::addChild(row, beforeChild);
}
break;
case 2:
// the under or over
// FIXME: text-align: center does not work
row->style()->setTextAlign(CENTER);
if (m_kind == UnderOver) {
// add the over as first
RenderBlock::addChild(row, firstChild());
} else {
// we really shouldn't get here as only munderover should have three children
RenderBlock::addChild(row, beforeChild);
}
break;
default:
// munderover shouldn't have more than three children. In theory we shouldn't
// get here if the MathML is correctly formed, but that isn't a guarantee.
// We will treat this as another under element and they'll get something funky.
RenderBlock::addChild(row, beforeChild);
}
row->addChild(child);
}
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);
}
}