libreoffice/slideshow/source/inc/stringanimation.hxx

/*************************************************************************
 *
 *  $RCSfile: stringanimation.hxx,v $
 *
 *  $Revision: 1.2 $
 *
 *  last change: $Author: rt $ $Date: 2004-11-26 19:22:12 $
 *
 *  The Contents of this file are made available subject to the terms of
 *  either of the following licenses
 *
 *         - GNU Lesser General Public License Version 2.1
 *         - Sun Industry Standards Source License Version 1.1
 *
 *  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
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
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 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *  MA  02111-1307  USA
 *
 *
 *  Sun Industry Standards Source License Version 1.1
 *  =================================================
 *  The contents of this file are subject to the Sun Industry Standards
 *  Source License Version 1.1 (the "License"); You may not use this file
 *  except in compliance with the License. You may obtain a copy of the
 *  License at http://www.openoffice.org/license.html.
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 ************************************************************************/

#ifndef _SLIDESHOW_STRINGANIMATION_HXX
#define _SLIDESHOW_STRINGANIMATION_HXX

#include <animation.hxx>

#ifndef _RTL_USTRING_HXX_
#include <rtl/ustring.hxx>
#endif


/* Definition of StringAnimation interface */

namespace presentation
{
    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 /* _SLIDESHOW_STRINGANIMATION_HXX */