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#ifndef INCLUDED_SLIDESHOW_DISCRETEACTIVITYBASE_HXX
#define INCLUDED_SLIDESHOW_DISCRETEACTIVITYBASE_HXX

#include "activitybase.hxx"
#include "wakeupevent.hxx"

#include <vector>


namespace slideshow
{
    namespace internal
    {
        /** Specialization of ActivityBase for discrete time activities.

        	A discrete time activity is one where time proceeds in
            discrete steps, i.e. at given time instants.
        */
        class DiscreteActivityBase : public ActivityBase
        {
        public:
            DiscreteActivityBase( const ActivityParameters& rParms );

            /** Hook for derived classes.

	            This method is called for each discrete time
                instant, with nFrame denoting the frame number
                (starting with 0)
                
                @param nFrame
                Current frame number.
                
                @param nRepeatCount
                Number of full repeats already performed
            */
            virtual void perform( sal_uInt32 nFrame, sal_uInt32 nRepeatCount ) const = 0;
            virtual void dispose();
            virtual bool perform();

        protected:
            virtual void startAnimation();

            sal_uInt32 calcFrameIndex( sal_uInt32 		nCurrCalls,
                                       ::std::size_t 	nVectorSize ) const;

            sal_uInt32 calcRepeatCount( sal_uInt32 		nCurrCalls,
                                        ::std::size_t 	nVectorSize ) const;

            ::std::size_t getNumberOfKeyTimes() const { return maDiscreteTimes.size(); }

        private:
            WakeupEventSharedPtr			mpWakeupEvent;
            const ::std::vector< double >	maDiscreteTimes;
            const double					mnSimpleDuration;
            sal_uInt32						mnCurrPerformCalls;
        };
    }
}

#endif /* INCLUDED_SLIDESHOW_DISCRETEACTIVITYBASE_HXX */