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Listener.hh

Go to the documentation of this file.

#ifndef LISTENER_H
#define LISTENER_H

template <typename EvType> 
class Listener
{
    public:
        Listener(): _registered(false), _ignoringHeardEvent(false), 
                    _processingEvent(false) {}
    
        virtual ~Listener() { ignoreEvents(); }
        
        void ignoreEvents();
        void listenForEvents();
        void ignoreThisEvent();
        inline void processEventPublic(const EvType&);
              
        bool isRegistered() const {return _registered;}
        
    protected:
        virtual void processEvent(const EvType& event) = 0;
        
    private: // methods
        inline void preProcessEvent();
        inline void postProcessEvent();

    private: // data
        bool _registered;
        bool _ignoringHeardEvent;
        bool _processingEvent;
};

template <typename EvType> 
inline void 
Listener<EvType>::preProcessEvent() 
{
    _ignoringHeardEvent = false;
    _processingEvent = true;
}

template <typename EvType> 
inline void 
Listener<EvType>::postProcessEvent() 
{
    _processingEvent = false;
    // ignoringHeardEvent doesn't need touching
}

template <typename EvType> 
inline void 
Listener<EvType>::processEventPublic(const EvType& event) 
{
    preProcessEvent();
    try {
        processEvent(event);
    }
    catch (...) {
        postProcessEvent(); 
        throw;
    }
    postProcessEvent();
}

#ifdef __GNUG__ 
  // because gcc doesn't handle separate template definition
  #include "Listener.cc"
#endif

#endif // LISTENER_H

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