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/*
* 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, 2008 Apple Inc. All rights reserved.
* Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
* (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
*
* 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.
*
*/
#ifndef EventTarget_h
#define EventTarget_h
#include <wtf/Forward.h>
namespace WebCore {
class AtomicString;
class DOMApplicationCache;
class Event;
class EventListener;
class EventTargetNode;
class MessagePort;
class ScriptExecutionContext;
class SVGElementInstance;
class Worker;
class WorkerContext;
class XMLHttpRequest;
class XMLHttpRequestUpload;
typedef int ExceptionCode;
class EventTarget {
public:
virtual MessagePort* toMessagePort();
virtual EventTargetNode* toNode();
virtual XMLHttpRequest* toXMLHttpRequest();
virtual XMLHttpRequestUpload* toXMLHttpRequestUpload();
#if ENABLE(OFFLINE_WEB_APPLICATIONS)
virtual DOMApplicationCache* toDOMApplicationCache();
#endif
#if ENABLE(SVG)
virtual SVGElementInstance* toSVGElementInstance();
#endif
#if ENABLE(WORKERS)
virtual Worker* toWorker();
virtual WorkerContext* toWorkerContext();
#endif
virtual ScriptExecutionContext* scriptExecutionContext() const = 0;
virtual void addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture) = 0;
virtual void removeEventListener(const AtomicString& eventType, EventListener*, bool useCapture) = 0;
virtual bool dispatchEvent(PassRefPtr<Event>, ExceptionCode&) = 0;
void ref() { refEventTarget(); }
void deref() { derefEventTarget(); }
// Handlers to do/undo actions on the target node before an event is dispatched to it and after the event
// has been dispatched. The data pointer is handed back by the preDispatch and passed to postDispatch.
virtual void* preDispatchEventHandler(Event*) { return 0; }
virtual void postDispatchEventHandler(Event*, void* /*dataFromPreDispatch*/) { }
protected:
virtual ~EventTarget();
private:
virtual void refEventTarget() = 0;
virtual void derefEventTarget() = 0;
};
void forbidEventDispatch();
void allowEventDispatch();
#ifndef NDEBUG
bool eventDispatchForbidden();
#else
inline void forbidEventDispatch() { }
inline void allowEventDispatch() { }
#endif
}
#endif
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