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#ifndef INCLUDED_SLIDESHOW_SIMPLECONTINUOUSACTIVITYBASE_HXX
#define INCLUDED_SLIDESHOW_SIMPLECONTINUOUSACTIVITYBASE_HXX

#include "activitybase.hxx"
#include <canvas/elapsedtime.hxx>

namespace slideshow
{
    namespace internal
    {
        /** Simple, continuous animation.

	        This class implements a simple, continuous animation
            without considering repeats or acceleration on the
            perform call. Only useful as a base class, you
            probably want to use ContinuousActivityBase.
        */
        class SimpleContinuousActivityBase : public ActivityBase
        {
        public:
            SimpleContinuousActivityBase( const ActivityParameters& rParms );

            virtual double calcTimeLag() const;
            virtual bool perform();
            
        protected:
            /** Hook for derived classes

	            This method will be called from perform().
                
                @param nSimpleTime
                Simple animation time, without repeat,
                acceleration or deceleration applied. This value
                is always in the [0,1] range, the repeat is
                accounted for with the nRepeatCount parameter.
                
                @param nRepeatCount
                Number of full repeats already performed
            */
            virtual void simplePerform( double nSimpleTime, sal_uInt32 nRepeatCount ) const = 0;
            
            virtual void startAnimation();

        private:
            /// Time elapsed since activity started
            ::canvas::tools::ElapsedTime	maTimer;

            /// Simple duration of activity
            const double					mnMinSimpleDuration;

            /// Minimal number of frames to show (see ActivityParameters)
            const sal_uInt32				mnMinNumberOfFrames;

            /// Actual number of frames shown until now.
            sal_uInt32						mnCurrPerformCalls;
        };
    }
}

#endif /* INCLUDED_SLIDESHOW_SIMPLECONTINUOUSACTIVITYBASE_HXX */