static ContainerNode* nextTraversingShadowTree(const ContainerNode& node, const ContainerNode* rootNode)
{
if (ShadowRoot* shadowRoot = authorShadowRootOf(node))
return shadowRoot;
const ContainerNode* current = &node;
while (current) {
if (Element* next = ElementTraversal::next(*current, rootNode))
return next;
if (!current->isInShadowTree())
return 0;
ShadowRoot* shadowRoot = current->containingShadowRoot();
if (shadowRoot == rootNode)
return 0;
if (ShadowRoot* youngerShadowRoot = shadowRoot->youngerShadowRoot()) {
// Should not obtain any elements in user-agent shadow root.
ASSERT(youngerShadowRoot->type() == ShadowRoot::AuthorShadowRoot);
return youngerShadowRoot;
}
current = shadowRoot->host();
}
return 0;
}
void SlotAssignment::assignSlots(ShadowRoot& shadowRoot)
{
ASSERT(!m_slotAssignmentsIsValid);
m_slotAssignmentsIsValid = true;
auto* host = shadowRoot.host();
RELEASE_ASSERT(host);
for (auto& entry : m_slots)
entry.value->assignedNodes.shrink(0);
for (Node* child = host->firstChild(); child; child = child->nextSibling()) {
if (is<Element>(child)) {
auto& slotName = downcast<Element>(*child).fastGetAttribute(slotAttr);
if (!slotName.isNull()) {
auto addResult = m_slots.add(treatNullAsEmpty(slotName), std::make_unique<SlotInfo>());
addResult.iterator->value->assignedNodes.append(child);
continue;
}
}
auto defaultSlotEntry = m_slots.find(emptyAtom);
if (defaultSlotEntry != m_slots.end())
defaultSlotEntry->value->assignedNodes.append(child);
}
for (auto& entry : m_slots)
entry.value->assignedNodes.shrinkToFit();
}
void SlotAssignment::addSlotElementByName(const AtomicString& name, HTMLSlotElement& slotElement, ShadowRoot& shadowRoot)
{
#ifndef NDEBUG
ASSERT(!m_slotElementsForConsistencyCheck.contains(&slotElement));
m_slotElementsForConsistencyCheck.add(&slotElement);
#endif
// FIXME: We should be able to do a targeted reconstruction.
shadowRoot.host()->setNeedsStyleRecalc(ReconstructRenderTree);
const AtomicString& key = treatNullAsEmpty(name);
auto addResult = m_slots.add(key, std::unique_ptr<SlotInfo>());
if (addResult.isNewEntry) {
addResult.iterator->value = std::make_unique<SlotInfo>(slotElement);
if (key == emptyAtom) // Because assignSlots doesn't collect nodes assgined to the default slot as an optimzation.
m_slotAssignmentsIsValid = false;
return;
}
auto& slotInfo = *addResult.iterator->value;
if (!slotInfo.hasSlotElements())
slotInfo.element = &slotElement;
else {
slotInfo.element = nullptr;
#ifndef NDEBUG
m_needsToResolveSlotElements = true;
#endif
}
slotInfo.elementCount++;
}
static inline bool shouldEventCrossShadowBoundary(Event& event, ShadowRoot& shadowRoot, EventTarget& target)
{
Node* targetNode = target.toNode();
#if ENABLE(FULLSCREEN_API) && ENABLE(VIDEO)
// Video-only full screen is a mode where we use the shadow DOM as an implementation
// detail that should not be detectable by the web content.
if (targetNode) {
if (Element* element = targetNode->document().webkitCurrentFullScreenElement()) {
// FIXME: We assume that if the full screen element is a media element that it's
// the video-only full screen. Both here and elsewhere. But that is probably wrong.
if (element->isMediaElement() && shadowRoot.host() == element)
return false;
}
}
#endif
// WebKit never allowed selectstart event to cross the the shadow DOM boundary.
// Changing this breaks existing sites.
// See https://bugs.webkit.org/show_bug.cgi?id=52195 for details.
const AtomicString& eventType = event.type();
bool targetIsInShadowRoot = targetNode && &targetNode->treeScope().rootNode() == &shadowRoot;
return !targetIsInShadowRoot
|| !(eventType == eventNames().abortEvent
|| eventType == eventNames().changeEvent
|| eventType == eventNames().errorEvent
|| eventType == eventNames().loadEvent
|| eventType == eventNames().resetEvent
|| eventType == eventNames().resizeEvent
|| eventType == eventNames().scrollEvent
|| eventType == eventNames().selectEvent
|| eventType == eventNames().selectstartEvent);
}
bool InspectorOverlay::handleMouseMove(const PlatformMouseEvent& event)
{
if (!shouldSearchForNode())
return false;
LocalFrame* frame = m_webViewImpl->mainFrameImpl()->frame();
if (!frame->view() || !frame->contentLayoutObject())
return false;
Node* node = hoveredNodeForEvent(frame, event, event.shiftKey());
// Do not highlight within user agent shadow root unless requested.
if (m_inspectMode != InspectorDOMAgent::SearchingForUAShadow) {
ShadowRoot* shadowRoot = InspectorDOMAgent::userAgentShadowRoot(node);
if (shadowRoot)
node = shadowRoot->host();
}
// Shadow roots don't have boxes - use host element instead.
if (node && node->isShadowRoot())
node = node->parentOrShadowHostNode();
if (!node)
return true;
Node* eventTarget = event.shiftKey() ? hoveredNodeForEvent(m_webViewImpl->mainFrameImpl()->frame(), event, false) : nullptr;
if (eventTarget == node)
eventTarget = nullptr;
if (node && m_inspectModeHighlightConfig) {
m_hoveredNodeForInspectMode = node;
m_domAgent->nodeHighlightedInOverlay(node);
highlightNode(node, eventTarget, *m_inspectModeHighlightConfig, event.ctrlKey() || event.metaKey());
}
return true;
}
void SlotAssignment::removeSlotElementByName(const AtomicString& name, HTMLSlotElement& slotElement, ShadowRoot& shadowRoot)
{
#ifndef NDEBUG
ASSERT(m_slotElementsForConsistencyCheck.contains(&slotElement));
m_slotElementsForConsistencyCheck.remove(&slotElement);
#endif
if (auto* host = shadowRoot.host()) // FIXME: We should be able to do a targeted reconstruction.
host->setNeedsStyleRecalc(ReconstructRenderTree);
auto it = m_slots.find(treatNullAsEmpty(name));
RELEASE_ASSERT(it != m_slots.end());
auto& slotInfo = *it->value;
RELEASE_ASSERT(slotInfo.hasSlotElements());
slotInfo.elementCount--;
if (slotInfo.element == &slotElement) {
slotInfo.element = nullptr;
#ifndef NDEBUG
m_needsToResolveSlotElements = true;
#endif
}
ASSERT(slotInfo.element || m_needsToResolveSlotElements);
}
Element* FocusNavigationScope::owner() const
{
Node* root = rootNode();
if (root->isShadowRoot()) {
ShadowRoot* shadowRoot = toShadowRoot(root);
return shadowRoot->host();
}
return 0;
}
static inline bool shouldStopAtShadowRoot(Event& event, ShadowRoot& shadowRoot, EventTarget& target)
{
// WebKit never allowed selectstart event to cross the the shadow DOM boundary.
// Changing this breaks existing sites.
// See https://bugs.webkit.org/show_bug.cgi?id=52195 for details.
const AtomicString eventType = event.type();
return target.toNode() && target.toNode()->shadowHost() == shadowRoot.host()
&& event.scoped();
}
void SlotAssignment::resolveAssignment(const ShadowRoot& shadowRoot)
{
m_assignment.clear();
using Name2Slot = WillBeHeapHashMap<AtomicString, RefPtrWillBeMember<HTMLSlotElement>>;
Name2Slot name2slot;
HTMLSlotElement* defaultSlot = nullptr;
WillBeHeapVector<RefPtrWillBeMember<HTMLSlotElement>> slots;
// TODO(hayato): Cache slots elements so that we do not have to travese the shadow tree. See ShadowRoot::descendantInsertionPoints()
for (HTMLSlotElement& slot : Traversal<HTMLSlotElement>::descendantsOf(shadowRoot)) {
slot.clearDistribution();
slots.append(&slot);
AtomicString name = slot.fastGetAttribute(HTMLNames::nameAttr);
if (name.isNull() || name.isEmpty()) {
if (!defaultSlot)
defaultSlot = &slot;
} else {
name2slot.add(name, &slot);
}
}
for (Node& child : NodeTraversal::childrenOf(*shadowRoot.host())) {
if (child.isElementNode()) {
if (isActiveInsertionPoint(child)) {
// TODO(hayato): Support re-distribution across v0 and v1 shadow trees
detachNotAssignedNode(child);
continue;
}
AtomicString slotName = toElement(child).fastGetAttribute(HTMLNames::slotAttr);
if (slotName.isNull() || slotName.isEmpty()) {
if (defaultSlot)
assign(child, *defaultSlot);
else
detachNotAssignedNode(child);
} else {
HTMLSlotElement* slot = name2slot.get(slotName);
if (slot)
assign(child, *slot);
else
detachNotAssignedNode(child);
}
} else if (defaultSlot) {
assign(child, *defaultSlot);
} else {
detachNotAssignedNode(child);
}
}
// Update each slot's distribution in reverse tree order so that a child slot is visited before its parent slot.
for (auto slot = slots.rbegin(); slot != slots.rend(); ++slot)
(*slot)->updateDistributedNodesWithFallback();
}
inline Node* ComposedTreeWalker::traverseParentOrHost(const Node* node) const
{
Node* parent = node->parentNode();
if (!parent)
return 0;
if (!parent->isShadowRoot())
return parent;
ShadowRoot* shadowRoot = toShadowRoot(parent);
ASSERT(!shadowRoot->shadowInsertionPointOfYoungerShadowRoot());
if (!shadowRoot->isYoungest())
return 0;
return shadowRoot->host();
}
ContainerNode* FlatTreeTraversal::traverseParentOrHost(const Node& node)
{
ContainerNode* parent = node.parentNode();
if (!parent)
return nullptr;
if (!parent->isShadowRoot())
return parent;
ShadowRoot* shadowRoot = toShadowRoot(parent);
DCHECK(!shadowRoot->shadowInsertionPointOfYoungerShadowRoot());
if (!shadowRoot->isYoungest())
return nullptr;
return &shadowRoot->host();
}
void InsertionPoint::removedFrom(ContainerNode* insertionPoint)
{
if (insertionPoint->inDocument()) {
ShadowRoot* root = containingShadowRoot();
if (!root)
root = insertionPoint->containingShadowRoot();
// host can be null when removedFrom() is called from ElementShadow destructor.
if (root && root->host())
root->owner()->invalidateDistribution();
// Since this insertion point is no longer visible from the shadow subtree, it need to clean itself up.
clearDistribution();
}
HTMLElement::removedFrom(insertionPoint);
}
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 ScopedStyleResolver::addHostRule(StyleRuleHost* hostRule, bool hasDocumentSecurityOrigin, const ContainerNode* scopingNode)
{
if (!scopingNode)
return;
ShadowRoot* shadowRoot = scopingNode->containingShadowRoot();
if (!shadowRoot || !shadowRoot->host())
return;
RuleSet* rule = ensureAtHostRuleSetFor(shadowRoot);
const Vector<RefPtr<StyleRuleBase> >& childRules = hostRule->childRules();
AddRuleFlags addRuleFlags = static_cast<AddRuleFlags>(hasDocumentSecurityOrigin ? RuleHasDocumentSecurityOrigin : RuleHasNoSpecialState);
for (unsigned i = 0; i < childRules.size(); ++i) {
StyleRuleBase* hostStylingRule = childRules[i].get();
if (hostStylingRule->isStyleRule())
rule->addStyleRule(static_cast<StyleRule*>(hostStylingRule), addRuleFlags);
}
}
void SlotAssignment::assignSlots(ShadowRoot& shadowRoot)
{
ASSERT(!m_slotAssignmentsIsValid);
m_slotAssignmentsIsValid = true;
for (auto& entry : m_slots)
entry.value->assignedNodes.shrink(0);
auto& host = *shadowRoot.host();
for (auto* child = host.firstChild(); child; child = child->nextSibling()) {
if (!is<Text>(*child) && !is<Element>(*child))
continue;
auto slotName = slotNameForHostChild(*child);
assignToSlot(*child, slotName);
}
for (auto& entry : m_slots)
entry.value->assignedNodes.shrinkToFit();
}
static inline bool shouldEventCrossShadowBoundary(Event& event, ShadowRoot& shadowRoot, EventTarget& target)
{
Node* targetNode = target.toNode();
#if ENABLE(FULLSCREEN_API) && ENABLE(VIDEO)
// Video-only full screen is a mode where we use the shadow DOM as an implementation
// detail that should not be detectable by the web content.
if (targetNode) {
if (Element* element = targetNode->document().webkitCurrentFullScreenElement()) {
// FIXME: We assume that if the full screen element is a media element that it's
// the video-only full screen. Both here and elsewhere. But that is probably wrong.
if (element->isMediaElement() && shadowRoot.host() == element)
return false;
}
}
#endif
bool targetIsInShadowRoot = targetNode && &targetNode->treeScope().rootNode() == &shadowRoot;
return !targetIsInShadowRoot || !event.scoped();
}
Node::InsertionNotificationRequest HTMLShadowElement::insertedInto(ContainerNode* insertionPoint)
{
if (insertionPoint->inDocument()) {
// Warn if trying to reproject between user agent and author shadows.
ShadowRoot* root = containingShadowRoot();
if (root && root->olderShadowRoot() && root->type() != root->olderShadowRoot()->type()) {
String message = String::format("<shadow> doesn't work for %s element host.", root->host()->tagName().utf8().data());
document().addConsoleMessage(RenderingMessageSource, WarningMessageLevel, message);
}
}
return InsertionPoint::insertedInto(insertionPoint);
}
void SlotAssignment::invalidate(ShadowRoot& shadowRoot)
{
// FIXME: We should be able to do a targeted reconstruction.
shadowRoot.host()->setNeedsStyleRecalc(ReconstructRenderTree);
m_slotAssignmentsIsValid = false;
}
