Event类是所有事件类的基类

/** *   Base class of all kinds of events. */class Event : public Ref{public:    enum class Type    {        TOUCH,        KEYBOARD,        ACCELERATION,        MOUSE,        CUSTOM    };    protected:    /** Constructor */    Event(Type type);public:    /** Destructor */    virtual ~Event();    /** Gets the event type */    inline Type getType() const { return _type; };        /** Stops propagation for current event */    inline void stopPropagation() { _isStopped = true; };        /** Checks whether the event has been stopped */    inline bool isStopped() const { return _isStopped; };        /** @brief Gets current target of the event     *  @return The target with which the event associates.     *  @note It onlys be available when the event listener is associated with node.      *        It returns 0 when the listener is associated with fixed priority.     */    inline Node* getCurrentTarget() { return _currentTarget; };    protected:    /** Sets current target */    inline void setCurrentTarget(Node* target) { _currentTarget = target; };        Type _type;     ///< Event type        bool _isStopped;       ///< whether the event has been stopped.    Node* _currentTarget;  ///< Current target        friend class EventDispatcher;};

事件Event