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 * Licensed to the Apache Software Foundation (ASF) under one
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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 * 
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#ifndef INCLUDED_SLIDESHOW_STRINGANIMATION_HXX
#define INCLUDED_SLIDESHOW_STRINGANIMATION_HXX

#include "animation.hxx"
#include <rtl/ustring.hxx>


/* Definition of StringAnimation interface */

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

        	This interface is a specialization of the Animation
        	interface, and is used to animate attributes representable
        	by a discrete character string (e.g. font names)
         */
        class StringAnimation : public Animation
        {
        public:
            typedef ::rtl::OUString ValueType;

            /** Set the animation to value rStr

                @param rStr
                Current animation value.
             */
            virtual bool operator()( const ValueType& rStr ) = 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< StringAnimation > StringAnimationSharedPtr;

    }
}

#endif /* INCLUDED_SLIDESHOW_STRINGANIMATION_HXX */