/* -*- 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_NUMBERANIMATION_HXX
#define INCLUDED_SLIDESHOW_SOURCE_INC_NUMBERANIMATION_HXX

#include <animation.hxx>


/* Definition of NumberAnimation interface */

namespace slideshow
{
    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 // INCLUDED_SLIDESHOW_SOURCE_INC_NUMBERANIMATION_HXX

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