| // Copyright 2015 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "cobalt/dom/event_target.h" |
| |
| #include "base/bind.h" |
| #include "base/bind_helpers.h" |
| #include "base/debug/trace_event.h" |
| #include "base/message_loop.h" |
| #include "cobalt/dom/dom_exception.h" |
| #include "cobalt/dom/global_stats.h" |
| #include "nb/memory_scope.h" |
| |
| namespace cobalt { |
| namespace dom { |
| |
| void EventTarget::AddEventListener(const std::string& type, |
| const EventListenerScriptValue& listener, |
| bool use_capture) { |
| // Do nothing if listener is null. |
| if (listener.IsNull()) { |
| return; |
| } |
| |
| EventListenerScriptValue::Reference listener_reference(this, listener); |
| |
| AddEventListenerInternal(base::Token(type), listener, use_capture, |
| EventListener::kNotAttribute); |
| } |
| |
| void EventTarget::RemoveEventListener(const std::string& type, |
| const EventListenerScriptValue& listener, |
| bool use_capture) { |
| // Do nothing if listener is null. |
| if (listener.IsNull()) { |
| return; |
| } |
| |
| for (EventListenerInfos::iterator iter = event_listener_infos_.begin(); |
| iter != event_listener_infos_.end(); ++iter) { |
| if ((*iter)->listener_type == EventListener::kNotAttribute && |
| (*iter)->type == type.c_str() && |
| (*iter)->listener.referenced_value().EqualTo(listener) && |
| (*iter)->use_capture == use_capture) { |
| event_listener_infos_.erase(iter); |
| return; |
| } |
| } |
| } |
| |
| // Dispatch event to a single event target outside the DOM tree. The event |
| // propagation in the DOM tree is implemented inside Node::DispatchEvent(). |
| bool EventTarget::DispatchEvent(const scoped_refptr<Event>& event, |
| script::ExceptionState* exception_state) { |
| if (!event || event->IsBeingDispatched() || !event->initialized_flag()) { |
| DOMException::Raise(DOMException::kInvalidStateErr, exception_state); |
| // Return value will be ignored. |
| return false; |
| } |
| |
| return DispatchEvent(event); |
| } |
| |
| bool EventTarget::DispatchEvent(const scoped_refptr<Event>& event) { |
| DCHECK(event); |
| DCHECK(!event->IsBeingDispatched()); |
| DCHECK(event->initialized_flag()); |
| TRACE_EVENT1("cobalt::dom", "EventTarget::DispatchEvent", "event", |
| event->type().c_str()); |
| |
| if (!event || event->IsBeingDispatched() || !event->initialized_flag()) { |
| return false; |
| } |
| |
| // The event is now being dispatched. Track it in the global stats. |
| GlobalStats::GetInstance()->StartJavaScriptEvent(); |
| |
| event->set_target(this); |
| event->set_event_phase(Event::kAtTarget); |
| FireEventOnListeners(event); |
| event->set_event_phase(Event::kNone); |
| |
| // The event has completed being dispatched. Stop tracking it in the global |
| // stats. |
| GlobalStats::GetInstance()->StopJavaScriptEvent(); |
| |
| return !event->default_prevented(); |
| } |
| |
| void EventTarget::DispatchEventAndRunCallback( |
| base::Token event_name, const base::Closure& dispatched_callback) { |
| DispatchEvent(make_scoped_refptr(new Event(event_name))); |
| if (!dispatched_callback.is_null()) { |
| dispatched_callback.Run(); |
| } |
| } |
| |
| void EventTarget::PostToDispatchEvent(const tracked_objects::Location& location, |
| base::Token event_name) { |
| PostToDispatchEventAndRunCallback(location, event_name, base::Closure()); |
| } |
| |
| void EventTarget::PostToDispatchEventAndRunCallback( |
| const tracked_objects::Location& location, base::Token event_name, |
| const base::Closure& callback) { |
| if (!MessageLoop::current()) { |
| return; |
| } |
| MessageLoop::current()->PostTask( |
| location, |
| base::Bind(base::IgnoreResult(&EventTarget::DispatchEventAndRunCallback), |
| base::AsWeakPtr<EventTarget>(this), event_name, callback)); |
| } |
| |
| void EventTarget::SetAttributeEventListener( |
| base::Token type, const EventListenerScriptValue& listener) { |
| // Remove existing attribute listener of the same type. |
| for (EventListenerInfos::iterator iter = event_listener_infos_.begin(); |
| iter != event_listener_infos_.end(); ++iter) { |
| if ((*iter)->listener_type == EventListener::kAttribute && |
| (*iter)->type == type) { |
| event_listener_infos_.erase(iter); |
| break; |
| } |
| } |
| |
| if (listener.IsNull()) { |
| return; |
| } |
| AddEventListenerInternal(type, listener, false, EventListener::kAttribute); |
| } |
| |
| const EventTarget::EventListenerScriptValue* |
| EventTarget::GetAttributeEventListener(base::Token type) const { |
| for (EventListenerInfos::const_iterator iter = event_listener_infos_.begin(); |
| iter != event_listener_infos_.end(); ++iter) { |
| if ((*iter)->listener_type == EventListener::kAttribute && |
| (*iter)->type == type) { |
| return &(*iter)->listener.referenced_value(); |
| } |
| } |
| return NULL; |
| } |
| |
| bool EventTarget::ShouldKeepWrapperAlive() { |
| return !event_listener_infos_.empty(); |
| } |
| |
| void EventTarget::TraceMembers(script::Tracer* tracer) { |
| UNREFERENCED_PARAMETER(tracer); |
| // TODO: EventListenerInfo references can be removed and logically live here |
| // instead. |
| } |
| |
| void EventTarget::FireEventOnListeners(const scoped_refptr<Event>& event) { |
| DCHECK(event->IsBeingDispatched()); |
| DCHECK(event->target()); |
| DCHECK(!event->current_target()); |
| |
| event->set_current_target(this); |
| |
| EventListenerInfos event_listener_infos; |
| for (EventListenerInfos::iterator iter = event_listener_infos_.begin(); |
| iter != event_listener_infos_.end(); ++iter) { |
| if ((*iter)->type == event->type()) { |
| event_listener_infos.push_back(new EventListenerInfo( |
| (*iter)->type, this, (*iter)->listener.referenced_value(), |
| (*iter)->use_capture, (*iter)->listener_type)); |
| } |
| } |
| |
| for (EventListenerInfos::iterator iter = event_listener_infos.begin(); |
| iter != event_listener_infos.end(); ++iter) { |
| if (event->immediate_propagation_stopped()) { |
| continue; |
| } |
| // Only call listeners marked as capture during capturing phase. |
| if (event->event_phase() == Event::kCapturingPhase && |
| !(*iter)->use_capture) { |
| continue; |
| } |
| // Don't call any listeners marked as capture during bubbling phase. |
| if (event->event_phase() == Event::kBubblingPhase && (*iter)->use_capture) { |
| continue; |
| } |
| (*iter)->listener.value().HandleEvent(event, (*iter)->listener_type); |
| } |
| |
| event->set_current_target(NULL); |
| } |
| |
| void EventTarget::AddEventListenerInternal( |
| base::Token type, const EventListenerScriptValue& listener, |
| bool use_capture, EventListener::Type listener_type) { |
| TRACK_MEMORY_SCOPE("DOM"); |
| |
| DCHECK(!listener.IsNull()); |
| |
| for (EventListenerInfos::iterator iter = event_listener_infos_.begin(); |
| iter != event_listener_infos_.end(); ++iter) { |
| if ((*iter)->type == type && |
| (*iter)->listener.referenced_value().EqualTo(listener) && |
| (*iter)->use_capture == use_capture && |
| (*iter)->listener_type == listener_type) { |
| // Attribute listeners should have already been removed. |
| DCHECK_EQ(listener_type, EventListener::kNotAttribute); |
| return; |
| } |
| } |
| |
| event_listener_infos_.push_back( |
| new EventListenerInfo(type, this, listener, use_capture, listener_type)); |
| } |
| |
| EventTarget::EventListenerInfo::EventListenerInfo( |
| base::Token type, EventTarget* const event_target, |
| const EventListenerScriptValue& listener, bool use_capture, |
| EventListener::Type listener_type) |
| : type(type), |
| listener(event_target, listener), |
| use_capture(use_capture), |
| listener_type(listener_type) { |
| GlobalStats::GetInstance()->AddEventListener(); |
| } |
| |
| EventTarget::EventListenerInfo::~EventListenerInfo() { |
| GlobalStats::GetInstance()->RemoveEventListener(); |
| } |
| |
| } // namespace dom |
| } // namespace cobalt |