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/*
* Copyright (C) 2006, 2007, 2008, 2009 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.
*/
#ifndef V8AbstractEventListener_h
#define V8AbstractEventListener_h
#include "EventListener.h"
#include "WorldContextHandle.h"
#include <v8.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
namespace WebCore {
class Event;
class Frame;
class V8Proxy;
// There are two kinds of event listeners: HTML or non-HMTL. onload,
// onfocus, etc (attributes) are always HTML event handler type; Event
// listeners added by Window.addEventListener or
// EventTargetNode::addEventListener are non-HTML type.
//
// Why does this matter?
// WebKit does not allow duplicated HTML event handlers of the same type,
// but ALLOWs duplicated non-HTML event handlers.
class V8AbstractEventListener : public EventListener {
public:
virtual ~V8AbstractEventListener();
static const V8AbstractEventListener* cast(const EventListener* listener)
{
return listener->type() == JSEventListenerType
? static_cast<const V8AbstractEventListener*>(listener)
: 0;
}
static V8AbstractEventListener* cast(EventListener* listener)
{
return const_cast<V8AbstractEventListener*>(cast(const_cast<const EventListener*>(listener)));
}
// Implementation of EventListener interface.
virtual bool operator==(const EventListener& other) { return this == &other; }
virtual void handleEvent(ScriptExecutionContext*, Event*);
virtual bool isLazy() const { return false; }
// Returns the listener object, either a function or an object.
v8::Local<v8::Object> getListenerObject(ScriptExecutionContext* context)
{
prepareListenerObject(context);
return v8::Local<v8::Object>::New(m_listener);
}
v8::Local<v8::Object> getExistingListenerObject()
{
return v8::Local<v8::Object>::New(m_listener);
}
bool hasExistingListenerObject()
{
return !m_listener.IsEmpty();
}
// Dispose listener object and clear the handle.
void disposeListenerObject();
const WorldContextHandle& worldContext() const { return m_worldContext; }
protected:
V8AbstractEventListener(bool isAttribute, const WorldContextHandle& worldContext);
virtual void prepareListenerObject(ScriptExecutionContext*) { }
void setListenerObject(v8::Handle<v8::Object> listener);
void invokeEventHandler(ScriptExecutionContext*, Event*, v8::Handle<v8::Value> jsEvent);
// Get the receiver object to use for event listener call.
v8::Local<v8::Object> getReceiverObject(Event*);
private:
// Implementation of EventListener function.
virtual bool virtualisAttribute() const { return m_isAttribute; }
virtual v8::Local<v8::Value> callListenerFunction(ScriptExecutionContext*, v8::Handle<v8::Value> jsevent, Event*) = 0;
v8::Persistent<v8::Object> m_listener;
// Indicates if the above handle is weak.
bool m_isWeak;
// Indicates if this is an HTML type listener.
bool m_isAttribute;
WorldContextHandle m_worldContext;
};
} // namespace WebCore
#endif // V8AbstractEventListener_h
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