Element* SlotScopedTraversal::next(const Element& current)
{
// current.assignedSlot returns a slot only when current is assigned explicitly
// If current is assigned to a slot, return a descendant of current, which is in the assigned scope of the same slot as current.
HTMLSlotElement* slot = current.assignedSlot();
Element* nearestAncestorAssignedToSlot = SlotScopedTraversal::nearestAncestorAssignedToSlot(current);
if (slot) {
if (Element* next = ElementTraversal::next(current, ¤t))
return next;
} else {
// If current is in assigned scope, find an assigned ancestor.
ASSERT(nearestAncestorAssignedToSlot);
if (Element* next = ElementTraversal::next(current, nearestAncestorAssignedToSlot))
return next;
slot = nearestAncestorAssignedToSlot->assignedSlot();
ASSERT(slot);
}
HeapVector<Member<Node>> assignedNodes = slot->getAssignedNodes();
size_t currentIndex = assignedNodes.find(*nearestAncestorAssignedToSlot);
ASSERT(currentIndex != kNotFound);
for (++currentIndex; currentIndex < assignedNodes.size(); ++currentIndex) {
if (assignedNodes[currentIndex]->isElementNode())
return toElement(assignedNodes[currentIndex]);
}
return nullptr;
}
Node* FlatTreeTraversal::traverseSiblingsForV1HostChild(const Node& node, TraversalDirection direction)
{
HTMLSlotElement* slot = finalDestinationSlotFor(node);
if (!slot)
return nullptr;
if (Node* siblingInDistributedNodes = (direction == TraversalDirectionForward ? slot->distributedNodeNextTo(node) : slot->distributedNodePreviousTo(node)))
return siblingInDistributedNodes;
return traverseSiblings(*slot, direction);
}
void SlotAssignment::assign(Node& hostChild, HTMLSlotElement& slot)
{
m_assignment.add(&hostChild, &slot);
slot.appendAssignedNode(hostChild);
if (isHTMLSlotElement(hostChild))
slot.appendDistributedNodes(toHTMLSlotElement(hostChild).getDistributedNodes());
else
slot.appendDistributedNode(hostChild);
}
static HTMLSlotElement* finalDestinationSlotFor(const Node& node)
{
HTMLSlotElement* slot = node.assignedSlot();
if (!slot)
return nullptr;
for (HTMLSlotElement* next = slot->assignedSlot(); next; next = next->assignedSlot()) {
slot = next;
}
return slot;
}
static bool wasInShadowTreeBeforeInserted(HTMLSlotElement& slot,
ContainerNode& insertionPoint) {
ShadowRoot* root1 = slot.containingShadowRoot();
ShadowRoot* root2 = insertionPoint.containingShadowRoot();
if (root1 && root2 && root1 == root2)
return false;
return root1;
}
static void flattenAssignedNodes(Vector<Node*>& nodes, const HTMLSlotElement& slot)
{
auto* assignedNodes = slot.assignedNodes();
if (!assignedNodes) {
for (Node* child = slot.firstChild(); child; child = child->nextSibling()) {
if (is<HTMLSlotElement>(*child))
flattenAssignedNodes(nodes, downcast<HTMLSlotElement>(*child));
else if (is<Text>(*child) || is<Element>(*child))
nodes.append(child);
}
return;
}
for (Node* node : *assignedNodes) {
if (is<HTMLSlotElement>(*node))
flattenAssignedNodes(nodes, downcast<HTMLSlotElement>(*node));
else
nodes.append(node);
}
}
void SlotAssignment::didChangeSlot(const AtomicString& slotAttrValue, ShadowRoot& shadowRoot)
{
auto& slotName = slotNameFromAttributeValue(slotAttrValue);
auto it = m_slots.find(slotName);
if (it == m_slots.end())
return;
HTMLSlotElement* slotElement = findFirstSlotElement(*it->value, shadowRoot);
if (!slotElement)
return;
shadowRoot.host()->invalidateStyleAndRenderersForSubtree();
m_slotAssignmentsIsValid = false;
if (shadowRoot.mode() == ShadowRootMode::UserAgent)
return;
slotElement->enqueueSlotChangeEvent();
}
void StyleInvalidator::invalidateSlotDistributedElements(HTMLSlotElement& slot, const RecursionData& recursionData) const
{
for (auto& distributedNode : slot.getDistributedNodes()) {
if (distributedNode->needsStyleRecalc())
continue;
if (!distributedNode->isElementNode())
continue;
if (recursionData.matchesCurrentInvalidationSetsAsSlotted(toElement(*distributedNode)))
distributedNode->setNeedsStyleRecalc(LocalStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::StyleInvalidator));
}
}
Element* SlotScopedTraversal::next(const Element& current) {
Element* nearestInclusiveAncestorAssignedToSlot =
SlotScopedTraversal::nearestInclusiveAncestorAssignedToSlot(current);
DCHECK(nearestInclusiveAncestorAssignedToSlot);
// Search within children of an element which is assigned to a slot.
if (Element* next = nextSkippingChildrenOfShadowHost(
current, *nearestInclusiveAncestorAssignedToSlot))
return next;
// Seek to the next element assigned to the same slot.
HTMLSlotElement* slot =
nearestInclusiveAncestorAssignedToSlot->assignedSlot();
DCHECK(slot);
const HeapVector<Member<Node>>& assignedNodes = slot->assignedNodes();
size_t currentIndex =
assignedNodes.find(*nearestInclusiveAncestorAssignedToSlot);
DCHECK_NE(currentIndex, kNotFound);
for (++currentIndex; currentIndex < assignedNodes.size(); ++currentIndex) {
if (assignedNodes[currentIndex]->isElementNode())
return toElement(assignedNodes[currentIndex]);
}
return nullptr;
}