/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file 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 with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#ifndef INCLUDED_SLIDESHOW_SOURCE_INC_STRINGANIMATION_HXX
#define INCLUDED_SLIDESHOW_SOURCE_INC_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 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_SOURCE_INC_STRINGANIMATION_HXX

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