// 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);
RenderPtr<RenderMathMLBlock> container = createRenderer<RenderMathMLBlock>(element(), RenderStyle::createAnonymousStyleWithDisplay(&style(), FLEX));
// This container doesn't offer any useful information to accessibility.
container->setIgnoreInAccessibilityTree(true);
container->initializeStyle();
RenderPtr<RenderText> text;
if (m_operator)
text = createRenderer<RenderText>(document(), String(&m_operator, 1));
else
text = createRenderer<RenderText>(document(), element().textContent().replace(hyphenMinus, minusSign).impl());
container->addChild(text.leakPtr());
addChild(container.leakPtr());
updateStyle();
setNeedsLayoutAndPrefWidthsRecalc();
}
void RenderMathMLFenced::makeFences()
{
RenderPtr<RenderMathMLOperator> openFence = createMathMLOperator(m_open, MathMLOperatorDictionary::Prefix, MathMLOperatorDictionary::Fence);
RenderMathMLRow::addChild(openFence.leakPtr(), firstChild());
RenderPtr<RenderMathMLOperator> closeFence = createMathMLOperator(m_close, MathMLOperatorDictionary::Postfix, MathMLOperatorDictionary::Fence);
m_closeFenceRenderer = closeFence.get();
RenderMathMLRow::addChild(closeFence.leakPtr());
}
void RenderMathMLFenced::addChild(RenderObject* child, RenderObject* beforeChild)
{
// make the fences if the render object is empty
if (isEmpty())
updateFromElement();
// FIXME: Adding or removing a child should possibly cause all later separators to shift places if they're different, as later child positions change by +1 or -1. This should also handle surrogate pairs. See https://bugs.webkit.org/show_bug.cgi?id=125938.
RenderPtr<RenderMathMLOperator> separatorRenderer;
if (m_separators.get()) {
unsigned int count = 0;
for (Node* position = child->node(); position; position = position->previousSibling()) {
if (position->isElementNode())
count++;
}
if (!beforeChild) {
// We're adding at the end (before the closing fence), so a new separator would go before the new child, not after it.
--count;
}
// |count| is now the number of element children that will be before our new separator, i.e. it's the 1-based index of the separator.
if (count > 0) {
UChar separator;
// Use the last separator if we've run out of specified separators.
if (count > m_separators.get()->length())
separator = (*m_separators.get())[m_separators.get()->length() - 1];
else
separator = (*m_separators.get())[count - 1];
StringBuilder builder;
builder.append(separator);
separatorRenderer = createMathMLOperator(builder.toString(), MathMLOperatorDictionary::Infix, MathMLOperatorDictionary::Separator);
}
}
if (beforeChild) {
// Adding |x| before an existing |y| e.g. in element (y) - first insert our new child |x|, then its separator, to get (x, y).
RenderMathMLRow::addChild(child, beforeChild);
if (separatorRenderer)
RenderMathMLRow::addChild(separatorRenderer.leakPtr(), beforeChild);
} else {
// Adding |y| at the end of an existing element e.g. (x) - insert the separator first before the closing fence, then |y|, to get (x, y).
if (separatorRenderer)
RenderMathMLRow::addChild(separatorRenderer.leakPtr(), m_closeFenceRenderer);
RenderMathMLRow::addChild(child, m_closeFenceRenderer);
}
}
void RenderMathMLToken::createWrapperIfNeeded()
{
if (!firstChild()) {
RenderPtr<RenderMathMLBlock> wrapper = createAnonymousMathMLBlock();
RenderMathMLBlock::addChild(wrapper.leakPtr());
}
}
void RenderMathMLFraction::addChild(RenderObject* child, RenderObject* /* beforeChild */)
{
if (isEmpty()) {
RenderPtr<RenderMathMLBlock> numeratorWrapper = createAnonymousMathMLBlock();
fixChildStyle(numeratorWrapper.get());
RenderMathMLBlock::addChild(numeratorWrapper.leakPtr());
RenderPtr<RenderMathMLBlock> denominatorWrapper = createAnonymousMathMLBlock();
fixChildStyle(denominatorWrapper.get());
RenderMathMLBlock::addChild(denominatorWrapper.leakPtr());
}
if (firstChild()->isEmpty())
downcast<RenderElement>(*firstChild()).addChild(child);
else
downcast<RenderElement>(*lastChild()).addChild(child);
updateFromElement();
}