interruptabledelayevent.hxx

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#ifndef INCLUDED_SLIDESHOW_SOURCE_INC_INTERRUPTABLEDELAYEVENT_HXX
#define INCLUDED_SLIDESHOW_SOURCE_INC_INTERRUPTABLEDELAYEVENT_HXX
 
#include "delayevent.hxx"
 
#include <utility>
 
namespace slideshow::internal
    {
        class DelayFacade : public Event
        {
        public:
            DelayFacade( EventSharedPtr         xEvent,
                         double                 nTimeout    ) :
                Event("DelayFacade"),
                mpEvent(std::move( xEvent )),
                mnTimeout( nTimeout )
            {
            }
 
            virtual bool fire() override
            {
                if( mpEvent && isCharged() )
                {
                    // pass on directly - we're supposed to be called
                    // from EventQueue here, anyway - and if not,
                    // we're only keeping that incorrect transitively.
                    return mpEvent->fire();
                }
 
                return false;
            }
 
            virtual bool isCharged() const override
            {
                // pass on to wrappee - this ensures that we return
                // false on isCharged(), even if the other event has
                // been fired outside our own fire() method
                return mpEvent && mpEvent->isCharged();
            }
 
            virtual double getActivationTime( double nCurrentTime ) const override
            {
                // enforce _our_ timeout to our clients (this
                // overrides any timeout possibly set at the wrappee!)
                return nCurrentTime + mnTimeout;
            }
 
            virtual void dispose() override
            {
                mpEvent.reset();
            }
 
        private:
            EventSharedPtr  mpEvent;
            double          mnTimeout;
        };
 
        struct InterruptableEventPair
        {
            EventSharedPtr  mpTimeoutEvent;
 
            EventSharedPtr  mpImmediateEvent;
        };
 
        template< typename Functor > InterruptableEventPair makeInterruptableDelay( const Functor&  rFunctor,
                                                                                    double          nTimeout    )
        {
            InterruptableEventPair aRes;
 
            aRes.mpImmediateEvent = makeEvent( rFunctor, "makeInterruptableDelay");
            aRes.mpTimeoutEvent = std::make_shared<DelayFacade>( aRes.mpImmediateEvent,
                                                        nTimeout );
 
            return aRes;
        }
 
}
 
#endif // INCLUDED_SLIDESHOW_SOURCE_INC_INTERRUPTABLEDELAYEVENT_HXX
 
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