/*************************************************************************
 *
 *  $RCSfile: numberanimation.hxx,v $
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 *  $Revision: 1.2 $
 *
 *  last change: $Author: rt $ $Date: 2004-11-26 19:18:34 $
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 *         - GNU Lesser General Public License Version 2.1
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 *  Sun Microsystems Inc., October, 2000
 *
 *  GNU Lesser General Public License Version 2.1
 *  =============================================
 *  Copyright 2000 by Sun Microsystems, Inc.
 *  901 San Antonio Road, Palo Alto, CA 94303, USA
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 *  This library is free software; you can redistribute it and/or
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 *  Sun Industry Standards Source License Version 1.1
 *  =================================================
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 ************************************************************************/

#ifndef _SLIDESHOW_NUMBERANIMATION_HXX
#define _SLIDESHOW_NUMBERANIMATION_HXX

#include <animation.hxx>


/* Definition of NumberAnimation interface */

namespace presentation
{
    namespace internal
    {
        /** Interface defining a number animation.

            This interface is a specialization of the Animation
            interface, and is used to animate attributes representable
            by a single floating point value.
         */
        class NumberAnimation : public Animation
        {
        public:
            typedef double ValueType;

            /** Set the animation to value x

                @param x
                Current animation value (must be in an
                attribute-specific permissible range). Overflowing
                values will be clipped to the permissible range
                internally.
             */
            virtual bool operator()( ValueType x ) = 0;

            /** Request the underlying value for this animation.

                This is necessary for pure To or By animations, as the
                Activity cannot determine a sensible start value
                otherwise.

                @attention Note that you are only permitted to query
                for the underlying value, if the animation has actually
                been started (via start() call).
             */
            virtual ValueType getUnderlyingValue() const = 0;
        };

        typedef ::boost::shared_ptr< NumberAnimation > NumberAnimationSharedPtr;

    }
}

#endif /* _SLIDESHOW_NUMBERANIMATION_HXX */