diff -r 000000000000 -r 4f2f89ce4247 WebCore/dom/EventTarget.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/WebCore/dom/EventTarget.cpp Fri Sep 17 09:02:29 2010 +0300 @@ -0,0 +1,363 @@ +/* + * Copyright (C) 1999 Lars Knoll (knoll@kde.org) + * (C) 1999 Antti Koivisto (koivisto@kde.org) + * (C) 2001 Dirk Mueller (mueller@kde.org) + * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved. + * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org) + * (C) 2007, 2008 Nikolas Zimmermann + * + * 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 "config.h" +#include "EventTarget.h" + +#include "Event.h" +#include "EventException.h" +#include + +using namespace WTF; + +namespace WebCore { + +#ifndef NDEBUG +static int gEventDispatchForbidden = 0; + +void forbidEventDispatch() +{ + if (!isMainThread()) + return; + ++gEventDispatchForbidden; +} + +void allowEventDispatch() +{ + if (!isMainThread()) + return; + if (gEventDispatchForbidden > 0) + --gEventDispatchForbidden; +} + +bool eventDispatchForbidden() +{ + if (!isMainThread()) + return false; + return gEventDispatchForbidden > 0; +} +#endif // NDEBUG + +EventTargetData::~EventTargetData() +{ + deleteAllValues(eventListenerMap); +} + +EventTarget::~EventTarget() +{ +} + +EventSource* EventTarget::toEventSource() +{ + return 0; +} + +Node* EventTarget::toNode() +{ + return 0; +} + +DOMWindow* EventTarget::toDOMWindow() +{ + return 0; +} + +XMLHttpRequest* EventTarget::toXMLHttpRequest() +{ + return 0; +} + +XMLHttpRequestUpload* EventTarget::toXMLHttpRequestUpload() +{ + return 0; +} + +#if ENABLE(OFFLINE_WEB_APPLICATIONS) +DOMApplicationCache* EventTarget::toDOMApplicationCache() +{ + return 0; +} +#endif + +#if ENABLE(SVG) +SVGElementInstance* EventTarget::toSVGElementInstance() +{ + return 0; +} +#endif + +#if ENABLE(WEB_SOCKETS) +WebSocket* EventTarget::toWebSocket() +{ + return 0; +} +#endif + +MessagePort* EventTarget::toMessagePort() +{ + return 0; +} + +#if ENABLE(WORKERS) +Worker* EventTarget::toWorker() +{ + return 0; +} + +DedicatedWorkerContext* EventTarget::toDedicatedWorkerContext() +{ + return 0; +} +#endif + +#if ENABLE(SHARED_WORKERS) +SharedWorker* EventTarget::toSharedWorker() +{ + return 0; +} +SharedWorkerContext* EventTarget::toSharedWorkerContext() +{ + return 0; +} +#endif + +#if ENABLE(NOTIFICATIONS) +Notification* EventTarget::toNotification() +{ + return 0; +} +#endif + +#if ENABLE(FILE_READER) +FileReader* EventTarget::toFileReader() +{ + return 0; +} +#endif + +#if ENABLE(INDEXED_DATABASE) +IDBRequest* EventTarget::toIDBRequest() +{ + return 0; +} +#endif + +bool EventTarget::addEventListener(const AtomicString& eventType, PassRefPtr listener, bool useCapture) +{ + EventTargetData* d = ensureEventTargetData(); + + pair result = d->eventListenerMap.add(eventType, 0); + EventListenerVector*& entry = result.first->second; + const bool isNewEntry = result.second; + if (isNewEntry) + entry = new EventListenerVector(); + + RegisteredEventListener registeredListener(listener, useCapture); + if (!isNewEntry) { + if (entry->find(registeredListener) != notFound) // duplicate listener + return false; + } + + entry->append(registeredListener); + return true; +} + +bool EventTarget::removeEventListener(const AtomicString& eventType, EventListener* listener, bool useCapture) +{ + EventTargetData* d = eventTargetData(); + if (!d) + return false; + + EventListenerMap::iterator result = d->eventListenerMap.find(eventType); + if (result == d->eventListenerMap.end()) + return false; + EventListenerVector* entry = result->second; + + RegisteredEventListener registeredListener(listener, useCapture); + size_t index = entry->find(registeredListener); + if (index == notFound) + return false; + + entry->remove(index); + if (entry->isEmpty()) { + delete entry; + d->eventListenerMap.remove(result); + } + + // Notify firing events planning to invoke the listener at 'index' that + // they have one less listener to invoke. + for (size_t i = 0; i < d->firingEventIterators.size(); ++i) { + if (eventType != d->firingEventIterators[i].eventType) + continue; + + if (index >= d->firingEventIterators[i].end) + continue; + + --d->firingEventIterators[i].end; + if (index <= d->firingEventIterators[i].iterator) + --d->firingEventIterators[i].iterator; + } + + return true; +} + +bool EventTarget::setAttributeEventListener(const AtomicString& eventType, PassRefPtr listener) +{ + clearAttributeEventListener(eventType); + if (!listener) + return false; + return addEventListener(eventType, listener, false); +} + +EventListener* EventTarget::getAttributeEventListener(const AtomicString& eventType) +{ + const EventListenerVector& entry = getEventListeners(eventType); + for (size_t i = 0; i < entry.size(); ++i) { + if (entry[i].listener->isAttribute()) + return entry[i].listener.get(); + } + return 0; +} + +bool EventTarget::clearAttributeEventListener(const AtomicString& eventType) +{ + EventListener* listener = getAttributeEventListener(eventType); + if (!listener) + return false; + return removeEventListener(eventType, listener, false); +} + +bool EventTarget::dispatchEvent(PassRefPtr event, ExceptionCode& ec) +{ + if (!event || event->type().isEmpty()) { + ec = EventException::UNSPECIFIED_EVENT_TYPE_ERR; + return false; + } + + if (!scriptExecutionContext()) + return false; + + return dispatchEvent(event); +} + +bool EventTarget::dispatchEvent(PassRefPtr event) +{ + event->setTarget(this); + event->setCurrentTarget(this); + event->setEventPhase(Event::AT_TARGET); + return fireEventListeners(event.get()); +} + +bool EventTarget::fireEventListeners(Event* event) +{ + ASSERT(!eventDispatchForbidden()); + ASSERT(event && !event->type().isEmpty()); + + EventTargetData* d = eventTargetData(); + if (!d) + return true; + + EventListenerMap::iterator result = d->eventListenerMap.find(event->type()); + if (result != d->eventListenerMap.end()) + fireEventListeners(event, d, *result->second); + + // Alias DOMFocusIn/DOMFocusOut to focusin/focusout (and vice versa). Just consider them to be the + // same event (triggering one another's handlers). This mechanism allows us to deprecate or change event + // names in the future and still make them be interoperable. + if (event->hasAliasedType() && !event->immediatePropagationStopped()) { + EventListenerMap::iterator result = d->eventListenerMap.find(event->aliasedType()); + if (result != d->eventListenerMap.end()) + fireEventListeners(event, d, *result->second); + } + return !event->defaultPrevented(); +} + +void EventTarget::fireEventListeners(Event* event, EventTargetData* d, EventListenerVector& entry) +{ + RefPtr protect = this; + + // Fire all listeners registered for this event. Don't fire listeners removed + // during event dispatch. Also, don't fire event listeners added during event + // dispatch. Conveniently, all new event listeners will be added after 'end', + // so iterating to 'end' naturally excludes new event listeners. + + size_t i = 0; + size_t end = entry.size(); + d->firingEventIterators.append(FiringEventIterator(event->type(), i, end)); + for ( ; i < end; ++i) { + RegisteredEventListener& registeredListener = entry[i]; + if (event->eventPhase() == Event::CAPTURING_PHASE && !registeredListener.useCapture) + continue; + if (event->eventPhase() == Event::BUBBLING_PHASE && registeredListener.useCapture) + continue; + + // If stopImmediatePropagation has been called, we just break out immediately, without + // handling any more events on this target. + if (event->immediatePropagationStopped()) + break; + + // To match Mozilla, the AT_TARGET phase fires both capturing and bubbling + // event listeners, even though that violates some versions of the DOM spec. + registeredListener.listener->handleEvent(scriptExecutionContext(), event); + } + d->firingEventIterators.removeLast(); +} + +const EventListenerVector& EventTarget::getEventListeners(const AtomicString& eventType) +{ + DEFINE_STATIC_LOCAL(EventListenerVector, emptyVector, ()); + + EventTargetData* d = eventTargetData(); + if (!d) + return emptyVector; + EventListenerMap::iterator it = d->eventListenerMap.find(eventType); + if (it == d->eventListenerMap.end()) + return emptyVector; + return *it->second; +} + +void EventTarget::removeAllEventListeners() +{ + EventTargetData* d = eventTargetData(); + if (!d) + return; + deleteAllValues(d->eventListenerMap); + d->eventListenerMap.clear(); + + // Notify firing events planning to invoke the listener at 'index' that + // they have one less listener to invoke. + for (size_t i = 0; i < d->firingEventIterators.size(); ++i) { + d->firingEventIterators[i].iterator = 0; + d->firingEventIterators[i].end = 0; + } +} + +} // namespace WebCore