| /* |
| * Copyright (C) 2010 Google Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #include "third_party/blink/renderer/core/dom/events/event_queue.h" |
| |
| #include "base/macros.h" |
| #include "third_party/blink/public/platform/task_type.h" |
| #include "third_party/blink/renderer/core/dom/events/event.h" |
| #include "third_party/blink/renderer/core/frame/local_dom_window.h" |
| #include "third_party/blink/renderer/core/probe/core_probes.h" |
| #include "third_party/blink/renderer/platform/wtf/functional.h" |
| |
| namespace blink { |
| |
| EventQueue::EventQueue(ExecutionContext* context, TaskType task_type) |
| : ExecutionContextLifecycleObserver(context), |
| task_type_(task_type), |
| is_closed_(false) { |
| if (!GetExecutionContext() || GetExecutionContext()->IsContextDestroyed()) |
| Close(nullptr); |
| } |
| |
| EventQueue::~EventQueue() = default; |
| |
| void EventQueue::Trace(Visitor* visitor) { |
| visitor->Trace(queued_events_); |
| ExecutionContextLifecycleObserver::Trace(visitor); |
| } |
| |
| bool EventQueue::EnqueueEvent(const base::Location& from_here, Event& event) { |
| if (is_closed_) |
| return false; |
| |
| DCHECK(event.target()); |
| DCHECK(GetExecutionContext()); |
| |
| probe::AsyncTaskScheduled(GetExecutionContext(), event.type(), |
| event.async_task_id()); |
| |
| bool was_added = queued_events_.insert(&event).is_new_entry; |
| DCHECK(was_added); // It should not have already been in the list. |
| |
| scoped_refptr<base::SingleThreadTaskRunner> task_runner = |
| GetExecutionContext()->GetTaskRunner(task_type_); |
| |
| // Pass the event as a weak persistent so that GC can collect an event-related |
| // object like IDBTransaction as soon as possible. |
| task_runner->PostTask( |
| FROM_HERE, WTF::Bind(&EventQueue::DispatchEvent, WrapPersistent(this), |
| WrapWeakPersistent(&event))); |
| |
| return true; |
| } |
| |
| void EventQueue::CancelAllEvents() { |
| if (!GetExecutionContext()) { |
| DCHECK(!queued_events_.size()); |
| return; |
| } |
| DoCancelAllEvents(GetExecutionContext()); |
| } |
| |
| bool EventQueue::RemoveEvent(Event& event) { |
| auto found = queued_events_.find(&event); |
| if (found == queued_events_.end()) |
| return false; |
| queued_events_.erase(found); |
| return true; |
| } |
| |
| void EventQueue::DispatchEvent(Event* event) { |
| if (!event || !RemoveEvent(*event)) |
| return; |
| |
| DCHECK(GetExecutionContext()); |
| |
| probe::AsyncTask async_task(GetExecutionContext(), event->async_task_id()); |
| EventTarget* target = event->target(); |
| if (LocalDOMWindow* window = target->ToLocalDOMWindow()) |
| window->DispatchEvent(*event, nullptr); |
| else |
| target->DispatchEvent(*event); |
| } |
| |
| void EventQueue::ContextDestroyed() { |
| Close(GetExecutionContext()); |
| } |
| |
| void EventQueue::Close(ExecutionContext* context) { |
| is_closed_ = true; |
| DoCancelAllEvents(context); |
| } |
| |
| void EventQueue::DoCancelAllEvents(ExecutionContext* context) { |
| for (const auto& queued_event : queued_events_) |
| probe::AsyncTaskCanceled(context, queued_event->async_task_id()); |
| queued_events_.clear(); |
| } |
| |
| bool EventQueue::HasPendingEvents() const { |
| return queued_events_.size() > 0; |
| } |
| |
| } // namespace blink |