LayoutObject* FirstLetterPseudoElement::firstLetterTextLayoutObject(const Element& element)
{
LayoutObject* parentLayoutObject = 0;
// If we are looking at a first letter element then we need to find the
// first letter text layoutObject from the parent node, and not ourselves.
if (element.isFirstLetterPseudoElement())
parentLayoutObject = element.parentOrShadowHostElement()->layoutObject();
else
parentLayoutObject = element.layoutObject();
if (!parentLayoutObject
|| !parentLayoutObject->style()->hasPseudoStyle(PseudoIdFirstLetter)
|| !canHaveGeneratedChildren(*parentLayoutObject)
|| !parentLayoutObject->canHaveFirstLineOrFirstLetterStyle())
return nullptr;
// Drill down into our children and look for our first text child.
LayoutObject* firstLetterTextLayoutObject = parentLayoutObject->slowFirstChild();
while (firstLetterTextLayoutObject) {
// This can be called when the first letter layoutObject is already in the tree. We do not
// want to consider that layoutObject for our text layoutObject so we go to the sibling (which is
// the LayoutTextFragment for the remaining text).
if (firstLetterTextLayoutObject->style() && firstLetterTextLayoutObject->style()->styleType() == PseudoIdFirstLetter) {
firstLetterTextLayoutObject = firstLetterTextLayoutObject->nextSibling();
} else if (firstLetterTextLayoutObject->isText()) {
// FIXME: If there is leading punctuation in a different LayoutText than
// the first letter, we'll not apply the correct style to it.
RefPtr<StringImpl> str = toLayoutText(firstLetterTextLayoutObject)->isTextFragment() ?
toLayoutTextFragment(firstLetterTextLayoutObject)->completeText() :
toLayoutText(firstLetterTextLayoutObject)->originalText();
if (firstLetterLength(str.get()) || isInvalidFirstLetterLayoutObject(firstLetterTextLayoutObject))
break;
firstLetterTextLayoutObject = firstLetterTextLayoutObject->nextSibling();
} else if (firstLetterTextLayoutObject->isListMarker()) {
firstLetterTextLayoutObject = firstLetterTextLayoutObject->nextSibling();
} else if (firstLetterTextLayoutObject->isFloatingOrOutOfFlowPositioned()) {
if (firstLetterTextLayoutObject->style()->styleType() == PseudoIdFirstLetter) {
firstLetterTextLayoutObject = firstLetterTextLayoutObject->slowFirstChild();
break;
}
firstLetterTextLayoutObject = firstLetterTextLayoutObject->nextSibling();
} else if (firstLetterTextLayoutObject->isAtomicInlineLevel() || firstLetterTextLayoutObject->isLayoutButton()
|| firstLetterTextLayoutObject->isMenuList()) {
return nullptr;
} else if (firstLetterTextLayoutObject->isFlexibleBoxIncludingDeprecated() || firstLetterTextLayoutObject->isLayoutGrid()) {
firstLetterTextLayoutObject = firstLetterTextLayoutObject->nextSibling();
} else if (!firstLetterTextLayoutObject->isInline()
&& firstLetterTextLayoutObject->style()->hasPseudoStyle(PseudoIdFirstLetter)
&& canHaveGeneratedChildren(*firstLetterTextLayoutObject)) {
// There is a layoutObject further down the tree which has PseudoIdFirstLetter set. When that node
// is attached we will handle setting up the first letter then.
return nullptr;
} else {
firstLetterTextLayoutObject = firstLetterTextLayoutObject->slowFirstChild();
}
}
// No first letter text to display, we're done.
// FIXME: This black-list of disallowed LayoutText subclasses is fragile. crbug.com/422336.
// Should counter be on this list? What about LayoutTextFragment?
if (!firstLetterTextLayoutObject || !firstLetterTextLayoutObject->isText() || isInvalidFirstLetterLayoutObject(firstLetterTextLayoutObject))
return nullptr;
return firstLetterTextLayoutObject;
}
