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#ifndef INCLUDED_SLIDESHOW_ANIMATION_HXX
#define INCLUDED_SLIDESHOW_ANIMATION_HXX

#include <animatableshape.hxx>
#include <shapeattributelayer.hxx>


/* Definition of Animation interface */

namespace slideshow
{
    namespace internal
    {
        /** Interface defining a generic animation.

            This interface is used by objects implementing the
            Activity interface to drive the animation effect. Objects
            implementing this interface will receive time-varying
            animation values, which they can forward to the
            appropriate attributes. The type of these animation values
            is given in derived interfaces.

            @see NumberAnimation
            @see ColorAnimation
            @see PairAnimation
         */
        class Animation
        {
        public:
            virtual ~Animation() {}

            /** Notify that the animation going active soon.

                Implementers should preload any buffers, and create
                any expensive objects at this time.

                @param rShape
                Shape to apply this animation to.

                @param rAttrLayer
                Attribute layer to play the animation on.
             */
            virtual void prefetch( const AnimatableShapeSharedPtr&     rShape,
                                   const ShapeAttributeLayerSharedPtr& rAttrLayer ) = 0;

            /** Notify that the animation is about to begin.

                Implementers are free to start accompanying effects,
                such as sounds, and the animation timer now.

                @param rShape
                Shape to apply this animation to.

                @param rAttrLayer
                Attribute layer to play the animation on.
             */
            virtual void start( const AnimatableShapeSharedPtr&     rShape,
                                const ShapeAttributeLayerSharedPtr& rAttrLayer ) = 0;

            /** Notify that the animation is about to end.
             */
            virtual void end() = 0;
        };

        typedef ::boost::shared_ptr< Animation > AnimationSharedPtr;

    }
}

#endif /* INCLUDED_SLIDESHOW_ANIMATION_HXX */

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