// FIXME: Once https://bugs.webkit.org/show_bug.cgi?id=52963 lands, this should
// be greatly improved. See https://bugs.webkit.org/show_bug.cgi?id=54025.
PassRefPtr<EventTarget> EventDispatcher::adjustRelatedTarget(Event* event, PassRefPtr<EventTarget> prpRelatedTarget)
{
if (!prpRelatedTarget)
return 0;
RefPtr<Node> relatedTarget = prpRelatedTarget->toNode();
if (!relatedTarget)
return 0;
Node* target = m_node.get();
if (!target)
return prpRelatedTarget;
ensureEventAncestors(event);
// Calculate early if the common boundary is even possible by looking at
// ancestors size and if the retargeting has occured (indicating the presence of shadow DOM boundaries).
// If there are no boundaries detected, the target and related target can't have a common boundary.
bool noCommonBoundary = ancestorsCrossShadowBoundaries(m_ancestors);
Vector<Node*> relatedTargetAncestors;
Node* outermostShadowBoundary = relatedTarget.get();
for (Node* n = outermostShadowBoundary; n; n = n->parentOrHostNode()) {
if (isShadowRootOrSVGShadowRoot(n))
outermostShadowBoundary = n->parentOrHostNode();
if (!noCommonBoundary)
relatedTargetAncestors.append(n);
}
// Short-circuit the fast case when we know there is no need to calculate a common boundary.
if (noCommonBoundary)
return outermostShadowBoundary;
return adjustToShadowBoundaries(relatedTarget.release(), relatedTargetAncestors);
}
bool EventDispatcher::dispatchEvent(PassRefPtr<Event> prpEvent)
{
#ifndef NDEBUG
ASSERT(!m_eventDispatched);
m_eventDispatched = true;
#endif
RefPtr<Event> event = prpEvent;
ChildNodesLazySnapshot::takeChildNodesLazySnapshot();
event->setTarget(eventTargetRespectingTargetRules(m_node.get()));
ASSERT(!NoEventDispatchAssertion::isEventDispatchForbidden());
ASSERT(event->target());
ASSERT(!event->type().isNull()); // JavaScript code can create an event with an empty name, but not null.
ensureEventAncestors(event.get());
WindowEventContext windowEventContext(event.get(), m_node.get(), topEventContext());
InspectorInstrumentationCookie cookie = InspectorInstrumentation::willDispatchEvent(m_node->document(), *event, windowEventContext.window(), m_node.get(), m_ancestors);
void* preDispatchEventHandlerResult;
if (dispatchEventPreProcess(event, preDispatchEventHandlerResult) == ContinueDispatching)
if (dispatchEventAtCapturing(event, windowEventContext) == ContinueDispatching)
if (dispatchEventAtTarget(event) == ContinueDispatching)
dispatchEventAtBubbling(event, windowEventContext);
dispatchEventPostProcess(event, preDispatchEventHandlerResult);
// Ensure that after event dispatch, the event's target object is the
// outermost shadow DOM boundary.
event->setTarget(windowEventContext.target());
event->setCurrentTarget(0);
InspectorInstrumentation::didDispatchEvent(cookie);
return !event->defaultPrevented();
}
void EventDispatcher::adjustRelatedTarget(Event* event, PassRefPtr<EventTarget> prpRelatedTarget)
{
if (!prpRelatedTarget)
return;
RefPtr<Node> relatedTarget = prpRelatedTarget->toNode();
if (!relatedTarget)
return;
if (!m_node.get())
return;
ensureEventAncestors(event);
EventRelatedTargetAdjuster(m_node, relatedTarget.release()).adjust(m_ancestors);
}
bool EventDispatcher::dispatchEvent(PassRefPtr<Event> event)
{
event->setTarget(eventTargetRespectingSVGTargetRules(m_node.get()));
ASSERT(!eventDispatchForbidden());
ASSERT(event->target());
ASSERT(!event->type().isNull()); // JavaScript code can create an event with an empty name, but not null.
RefPtr<EventTarget> originalTarget = event->target();
ensureEventAncestors(event.get());
WindowEventContext windowContext(event.get(), m_node.get(), topEventContext());
InspectorInstrumentationCookie cookie = InspectorInstrumentation::willDispatchEvent(m_node->document(), *event, windowContext.window(), m_node.get(), m_ancestors);
// Give the target node a chance to do some work before DOM event handlers get a crack.
void* data = m_node->preDispatchEventHandler(event.get());
if (m_ancestors.isEmpty() || m_shouldPreventDispatch || event->propagationStopped())
goto doneDispatching;
// Trigger capturing event handlers, starting at the top and working our way down.
event->setEventPhase(Event::CAPTURING_PHASE);
if (windowContext.handleLocalEvents(event.get()) && event->propagationStopped())
goto doneDispatching;
for (size_t i = m_ancestors.size() - 1; i > 0; --i) {
const EventContext& eventContext = m_ancestors[i];
if (eventContext.currentTargetSameAsTarget()) {
if (event->bubbles())
continue;
event->setEventPhase(Event::AT_TARGET);
} else
event->setEventPhase(Event::CAPTURING_PHASE);
eventContext.handleLocalEvents(event.get());
if (event->propagationStopped())
goto doneDispatching;
}
event->setEventPhase(Event::AT_TARGET);
event->setTarget(originalTarget.get());
event->setCurrentTarget(eventTargetRespectingSVGTargetRules(m_node.get()));
m_ancestors[0].handleLocalEvents(event.get());
if (event->propagationStopped())
goto doneDispatching;
if (event->bubbles() && !event->cancelBubble()) {
// Trigger bubbling event handlers, starting at the bottom and working our way up.
event->setEventPhase(Event::BUBBLING_PHASE);
size_t size = m_ancestors.size();
for (size_t i = 1; i < size; ++i) {
const EventContext& eventContext = m_ancestors[i];
if (eventContext.currentTargetSameAsTarget())
event->setEventPhase(Event::AT_TARGET);
else
event->setEventPhase(Event::BUBBLING_PHASE);
eventContext.handleLocalEvents(event.get());
if (event->propagationStopped() || event->cancelBubble())
goto doneDispatching;
}
windowContext.handleLocalEvents(event.get());
}
doneDispatching:
event->setTarget(originalTarget.get());
event->setCurrentTarget(0);
event->setEventPhase(0);
// Pass the data from the preDispatchEventHandler to the postDispatchEventHandler.
m_node->postDispatchEventHandler(event.get(), data);
// Call default event handlers. While the DOM does have a concept of preventing
// default handling, the detail of which handlers are called is an internal
// implementation detail and not part of the DOM.
if (!event->defaultPrevented() && !event->defaultHandled()) {
// Non-bubbling events call only one default event handler, the one for the target.
m_node->defaultEventHandler(event.get());
ASSERT(!event->defaultPrevented());
if (event->defaultHandled())
goto doneWithDefault;
// For bubbling events, call default event handlers on the same targets in the
// same order as the bubbling phase.
if (event->bubbles()) {
size_t size = m_ancestors.size();
for (size_t i = 1; i < size; ++i) {
m_ancestors[i].node()->defaultEventHandler(event.get());
ASSERT(!event->defaultPrevented());
if (event->defaultHandled())
goto doneWithDefault;
}
}
}
doneWithDefault:
// Ensure that after event dispatch, the event's target object is the
// outermost shadow DOM boundary.
event->setTarget(windowContext.target());
event->setCurrentTarget(0);
InspectorInstrumentation::didDispatchEvent(cookie);
return !event->defaultPrevented();
}
