axmol/cocos/2d/CCEventListener.h

/****************************************************************************
 Copyright (c) 2013 cocos2d-x.org
 
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#ifndef cocos2d_libs_EventListener_h
#define cocos2d_libs_EventListener_h

#include "CCPlatformMacros.h"
#include "CCObject.h"

#include <functional>
#include <string>
#include <memory>

NS_CC_BEGIN

class Event;

/**
 *  The base class of event listener.
 *  If you need custom listener which with different callback, you need to inherit this class.
 *  For instance, you could refer to AccelerationEventListener, KeyboardEventListener or TouchEventListener, CustomEventListener.
 */
class EventListener : public Object
{    
protected:
    /** Constructor */
    EventListener();
    
    /** Initializes event with type and callback function */
    bool init(const std::string& t, std::function<void(Event*)>callback);
public:
    /** Destructor */
    virtual ~EventListener();
    
    /** Checks whether the listener is available. */
    virtual bool checkAvailable() = 0;
    
    /** Clones the listener, its subclasses have to override this method. */
    virtual EventListener* clone() = 0;
protected:
    std::function<void(Event*)> _onEvent;   /// Event callback function
    std::string _type;                      /// Event type
    bool _isRegistered;                    /// Whether the listener has been added to dispatcher.
    
    friend class EventDispatcher;
    friend class Node;
};

NS_CC_END

#endif