void RenderObjectChildList::updateBeforeAfterContent(RenderObject* owner, PseudoId type, const RenderObject* styledObject)
{
// Double check that the document did in fact use generated content rules. Otherwise we should not have been called.
ASSERT(owner->document()->usesBeforeAfterRules());
// In CSS2, before/after pseudo-content cannot nest. Check this first.
if (owner->style()->styleType() == BEFORE || owner->style()->styleType() == AFTER)
return;
if (!styledObject)
styledObject = owner;
RenderStyle* pseudoElementStyle = styledObject->getCachedPseudoStyle(type);
RenderObject* child;
switch (type) {
case BEFORE:
child = beforePseudoElementRenderer(owner);
break;
case AFTER:
child = afterPseudoElementRenderer(owner);
break;
default:
ASSERT_NOT_REACHED();
return;
}
// Whether or not we currently have generated content attached.
bool oldContentPresent = child;
// Whether or not we now want generated content.
bool newContentWanted = pseudoElementStyle && pseudoElementStyle->display() != NONE;
// For <q><p/></q>, if this object is the inline continuation of the <q>, we only want to generate
// :after content and not :before content.
if (newContentWanted && type == BEFORE && owner->isElementContinuation())
newContentWanted = false;
// Similarly, if we're the beginning of a <q>, and there's an inline continuation for our object,
// then we don't generate the :after content.
if (newContentWanted && type == AFTER && owner->virtualContinuation())
newContentWanted = false;
// If we don't want generated content any longer, or if we have generated content, but it's no longer
// identical to the new content data we want to build render objects for, then we nuke all
// of the old generated content.
if (oldContentPresent && (!newContentWanted || Node::diff(child->style(), pseudoElementStyle, owner->document()) == Node::Detach)) {
// Nuke the child.
if (child->style()->styleType() == type) {
oldContentPresent = false;
child->destroy();
child = (type == BEFORE) ? owner->virtualChildren()->firstChild() : owner->virtualChildren()->lastChild();
}
}
// If we have no pseudo-element style or if the pseudo-element style's display type is NONE, then we
// have no generated content and can now return.
if (!newContentWanted)
return;
if (owner->isRenderInline() && !pseudoElementStyle->isDisplayInlineType() && !pseudoElementStyle->isFloating() &&
!(pseudoElementStyle->position() == AbsolutePosition || pseudoElementStyle->position() == FixedPosition))
// According to the CSS2 spec (the end of section 12.1), the only allowed
// display values for the pseudo style are NONE and INLINE for inline flows.
// FIXME: CSS2.1 lifted this restriction, but block display types will crash.
// For now we at least relax the restriction to allow all inline types like inline-block
// and inline-table.
pseudoElementStyle->setDisplay(INLINE);
if (oldContentPresent) {
updateBeforeAfterStyle(child, type, pseudoElementStyle);
return; // We've updated the generated content. That's all we needed to do.
}
RenderObject* insertBefore = (type == BEFORE) ? owner->virtualChildren()->firstChild() : 0;
if (insertBefore && insertBefore->isAnonymousBlock() && insertBefore->childrenInline() && !insertBefore->isEmpty()) {
// We are going to add the "before" element. We have to check whether the "insertBefore" element
// is an anonymous block with inline children. If it is, then we should insert the "before" element
// before the first inline child of the anonymous block, otherwise we will end up with the "before"
// element in a different block. We do this only when the anonymous block has children, otherwise
// we end up with the before element in a wrong block.
insertBefore = insertBefore->firstChild();
}
// Nothing goes before the intruded run-in, not even generated content.
if (insertBefore && insertBefore->isRunIn() && owner->isRenderBlock()
&& toRenderBlock(owner)->runInIsPlacedIntoSiblingBlock(insertBefore))
insertBefore = insertBefore->nextSibling();
// Generated content consists of a single container that houses multiple children (specified
// by the content property). This generated content container gets the pseudo-element style set on it.
RenderObject* generatedContentContainer = 0;
// Walk our list of generated content and create render objects for each.
for (const ContentData* content = pseudoElementStyle->contentData(); content; content = content->next()) {
RenderObject* renderer = createRendererForBeforeAfterContent(owner, content, pseudoElementStyle);
if (renderer) {
if (!generatedContentContainer) {
// Make a generated box that might be any display type now that we are able to drill down into children
// to find the original content properly.
generatedContentContainer = RenderObject::createObject(owner->document(), pseudoElementStyle);
ASSERT(styledObject->node()); // The styled object cannot be anonymous or else it could not have ':before' or ':after' pseudo elements.
generatedContentContainer->setNode(styledObject->node()); // This allows access to the generatingNode.
generatedContentContainer->setStyle(pseudoElementStyle);
if (!owner->isChildAllowed(generatedContentContainer, pseudoElementStyle)) {
// The generated content container is not allowed here -> abort.
generatedContentContainer->destroy();
renderer->destroy();
return;
}
// When we don't have a first child and are part of a continuation chain,
// insertBefore is incorrectly set to zero above, which causes the :before
// child to end up at the end of continuation chain.
// See https://bugs.webkit.org/show_bug.cgi?id=78380.
if (!insertBefore && type == BEFORE && owner->virtualContinuation())
owner->addChildIgnoringContinuation(generatedContentContainer, 0);
else
owner->addChild(generatedContentContainer, insertBefore);
}
if (generatedContentContainer->isChildAllowed(renderer, pseudoElementStyle))
generatedContentContainer->addChild(renderer);
else
renderer->destroy();
}
}
if (!generatedContentContainer)
return;
// Handle placement of run-ins. We do the run-in placement at the end since generatedContentContainer can get destroyed.
RenderObject* generatedContentContainerImmediateParent = generatedContentContainer->parent();
if (generatedContentContainerImmediateParent->isRenderBlock())
toRenderBlock(generatedContentContainerImmediateParent)->placeRunInIfNeeded(generatedContentContainer, PlaceGeneratedRunIn);
}
void RenderObjectChildList::updateBeforeAfterContent(RenderObject* owner, PseudoId type, const RenderObject* styledObject)
{
// Double check that the document did in fact use generated content rules. Otherwise we should not have been called.
ASSERT(owner->document()->usesBeforeAfterRules());
// In CSS2, before/after pseudo-content cannot nest. Check this first.
if (owner->style()->styleType() == BEFORE || owner->style()->styleType() == AFTER)
return;
if (!styledObject)
styledObject = owner;
RenderStyle* pseudoElementStyle = styledObject->getCachedPseudoStyle(type);
RenderObject* child;
switch (type) {
case BEFORE:
child = beforePseudoElementRenderer(owner);
break;
case AFTER:
child = afterPseudoElementRenderer(owner);
break;
default:
ASSERT_NOT_REACHED();
return;
}
// Whether or not we currently have generated content attached.
bool oldContentPresent = child;
// Whether or not we now want generated content.
bool newContentWanted = pseudoElementStyle && pseudoElementStyle->display() != NONE;
// For <q><p/></q>, if this object is the inline continuation of the <q>, we only want to generate
// :after content and not :before content.
if (newContentWanted && type == BEFORE && owner->isElementContinuation())
newContentWanted = false;
// Similarly, if we're the beginning of a <q>, and there's an inline continuation for our object,
// then we don't generate the :after content.
if (newContentWanted && type == AFTER && owner->virtualContinuation())
newContentWanted = false;
// If we don't want generated content any longer, or if we have generated content, but it's no longer
// identical to the new content data we want to build render objects for, then we nuke all
// of the old generated content.
if (oldContentPresent && (!newContentWanted || Node::diff(child->style(), pseudoElementStyle) == Node::Detach)) {
// Nuke the child.
if (child->style()->styleType() == type) {
oldContentPresent = false;
child->destroy();
child = (type == BEFORE) ? owner->virtualChildren()->firstChild() : owner->virtualChildren()->lastChild();
}
}
// If we have no pseudo-element style or if the pseudo-element style's display type is NONE, then we
// have no generated content and can now return.
if (!newContentWanted)
return;
if (owner->isRenderInline() && !pseudoElementStyle->isDisplayInlineType() && pseudoElementStyle->floating() == FNONE &&
!(pseudoElementStyle->position() == AbsolutePosition || pseudoElementStyle->position() == FixedPosition))
// According to the CSS2 spec (the end of section 12.1), the only allowed
// display values for the pseudo style are NONE and INLINE for inline flows.
// FIXME: CSS2.1 lifted this restriction, but block display types will crash.
// For now we at least relax the restriction to allow all inline types like inline-block
// and inline-table.
pseudoElementStyle->setDisplay(INLINE);
if (oldContentPresent) {
if (child && child->style()->styleType() == type) {
// We have generated content present still. We want to walk this content and update our
// style information with the new pseudo-element style.
child->setStyle(pseudoElementStyle);
RenderObject* beforeAfterParent = findBeforeAfterParent(child);
if (!beforeAfterParent)
return;
// Note that if we ever support additional types of generated content (which should be way off
// in the future), this code will need to be patched.
for (RenderObject* genChild = beforeAfterParent->firstChild(); genChild; genChild = genChild->nextSibling()) {
if (genChild->isText())
// Generated text content is a child whose style also needs to be set to the pseudo-element style.
genChild->setStyle(pseudoElementStyle);
else if (genChild->isImage()) {
// Images get an empty style that inherits from the pseudo.
RefPtr<RenderStyle> style = RenderStyle::create();
style->inheritFrom(pseudoElementStyle);
genChild->setStyle(style.release());
} else {
// RenderListItem may insert a list marker here. We do not need to care about this case.
// Otherwise, genChild must be a first-letter container. updateFirstLetter() will take care of it.
ASSERT(genChild->isListMarker() || genChild->style()->styleType() == FIRST_LETTER);
}
}
}
return; // We've updated the generated content. That's all we needed to do.
}
RenderObject* insertBefore = (type == BEFORE) ? owner->virtualChildren()->firstChild() : 0;
// Generated content consists of a single container that houses multiple children (specified
// by the content property). This generated content container gets the pseudo-element style set on it.
RenderObject* generatedContentContainer = 0;
// Walk our list of generated content and create render objects for each.
for (const ContentData* content = pseudoElementStyle->contentData(); content; content = content->next()) {
RenderObject* renderer = 0;
switch (content->type()) {
case CONTENT_NONE:
break;
case CONTENT_TEXT:
renderer = new (owner->renderArena()) RenderTextFragment(owner->document() /* anonymous object */, content->text());
renderer->setStyle(pseudoElementStyle);
break;
case CONTENT_OBJECT: {
RenderImage* image = new (owner->renderArena()) RenderImage(owner->document()); // anonymous object
RefPtr<RenderStyle> style = RenderStyle::create();
style->inheritFrom(pseudoElementStyle);
image->setStyle(style.release());
if (StyleImage* styleImage = content->image())
image->setImageResource(RenderImageResourceStyleImage::create(styleImage));
else
image->setImageResource(RenderImageResource::create());
renderer = image;
break;
}
case CONTENT_COUNTER:
renderer = new (owner->renderArena()) RenderCounter(owner->document(), *content->counter());
renderer->setStyle(pseudoElementStyle);
break;
case CONTENT_QUOTE:
renderer = new (owner->renderArena()) RenderQuote(owner->document(), content->quote());
renderer->setStyle(pseudoElementStyle);
break;
}
if (renderer) {
if (!generatedContentContainer) {
// Make a generated box that might be any display type now that we are able to drill down into children
// to find the original content properly.
generatedContentContainer = RenderObject::createObject(owner->document(), pseudoElementStyle);
ASSERT(styledObject->node()); // The styled object cannot be anonymous or else it could not have ':before' or ':after' pseudo elements.
generatedContentContainer->setNode(styledObject->node()); // This allows access to the generatingNode.
generatedContentContainer->setStyle(pseudoElementStyle);
owner->addChild(generatedContentContainer, insertBefore);
}
if (generatedContentContainer->isChildAllowed(renderer, pseudoElementStyle))
generatedContentContainer->addChild(renderer);
else
renderer->destroy();
}
}
}
