/* * 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: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 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. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "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 THE COPYRIGHT * OWNER 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 "config.h" #include "ScopedEventQueue.h" #include "Event.h" #include "EventDispatcher.h" #include "EventTarget.h" namespace WebCore { ScopedEventQueue::ScopedEventQueue() : m_scopingLevel(0) { } ScopedEventQueue::~ScopedEventQueue() { ASSERT(!m_scopingLevel); ASSERT(!m_queuedEvents.size()); } ScopedEventQueue& ScopedEventQueue::instance() { static NeverDestroyed<ScopedEventQueue> scopedEventQueue; return scopedEventQueue; } void ScopedEventQueue::enqueueEvent(PassRefPtr<Event> event) { if (m_scopingLevel) m_queuedEvents.append(event); else dispatchEvent(event); } void ScopedEventQueue::dispatchEvent(PassRefPtr<Event> event) const { ASSERT(event->target()); // Store the target in a local variable to avoid possibly dereferencing a nullified PassRefPtr after it's passed on. Node* node = event->target()->toNode(); EventDispatcher::dispatchEvent(node, event); } void ScopedEventQueue::dispatchAllEvents() { Vector<RefPtr<Event>> queuedEvents = WTF::move(m_queuedEvents); for (size_t i = 0; i < queuedEvents.size(); i++) dispatchEvent(queuedEvents[i].release()); } void ScopedEventQueue::incrementScopingLevel() { m_scopingLevel++; } void ScopedEventQueue::decrementScopingLevel() { ASSERT(m_scopingLevel); m_scopingLevel--; if (!m_scopingLevel) dispatchAllEvents(); } }