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      1 /*
      2  * Copyright (C) 2006, 2008, 2009 Apple Inc. All rights reserved.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  *
     19  */
     20 
     21 #ifndef EventListener_h
     22 #define EventListener_h
     23 
     24 #include "PlatformString.h"
     25 #include <wtf/RefCounted.h>
     26 
     27 namespace JSC {
     28     class JSObject;
     29     class MarkStack;
     30 }
     31 
     32 namespace WebCore {
     33 
     34     class ScriptExecutionContext;
     35     class Event;
     36 
     37     class EventListener : public RefCounted<EventListener> {
     38     public:
     39         enum Type { JSEventListenerType,
     40                     ImageEventListenerType,
     41                     InspectorDOMAgentType,
     42                     InspectorDOMStorageResourceType,
     43                     ObjCEventListenerType,
     44                     ConditionEventListenerType,
     45                     GeolocationEventListenerType };
     46 
     47         virtual ~EventListener() { }
     48         virtual bool operator==(const EventListener&) = 0;
     49         virtual void handleEvent(ScriptExecutionContext*, Event*) = 0;
     50         // Return true to indicate that the error is handled.
     51         virtual bool reportError(ScriptExecutionContext*, const String& /*message*/, const String& /*url*/, int /*lineNumber*/) { return false; }
     52         virtual bool wasCreatedFromMarkup() const { return false; }
     53 
     54 #if USE(JSC)
     55         virtual void markJSFunction(JSC::MarkStack&) { }
     56         virtual void invalidateJSFunction(JSC::JSObject*) { }
     57 #endif
     58 
     59         bool isAttribute() const { return virtualisAttribute(); }
     60         Type type() const { return m_type; }
     61 
     62     protected:
     63         EventListener(Type type)
     64             : m_type(type)
     65         {
     66         }
     67 
     68     private:
     69         virtual bool virtualisAttribute() const { return false; }
     70 
     71         Type m_type;
     72     };
     73 
     74 }
     75 
     76 #endif
     77