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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2008-2013 Pelican Mapping
* http://osgearth.org
*
* osgEarth is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* 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.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>
*/
#ifndef OSGEARTH_TIME_CONTROL_H
#define OSGEARTH_TIME_CONTROL_H 1

#include <osgEarth/Common>
#include <osg/FrameStamp>
#include <vector>

namespace osgEarth
{
    /**
     * Information about one of the frames in a sequence.
     */
    struct SequenceFrameInfo
    {
        std::string timeIdentifier;
    };


    /**
     * Interface to an object that is subject to time controls.
     * Pure virtual.
     */
    class SequenceControl
    {
    public:
        /** Whether the implementation supports these methods */
        virtual bool supportsSequenceControl() const =0;

        /** Starts playback */
        virtual void playSequence() =0;

        /** Stops playback */
        virtual void pauseSequence() =0;

        /** Seek to a specific frame */
        virtual void seekToSequenceFrame(unsigned frame) =0;

        /** Whether the object is in playback mode */
        virtual bool isSequencePlaying() const =0;

        /** Gets data about the current frame in the sequence */
        virtual const std::vector<SequenceFrameInfo>& getSequenceFrameInfo() const =0;

        /** Gets the index of the current frame. */
        virtual int getCurrentSequenceFrameIndex( const osg::FrameStamp* ) const =0;
    };
}

#endif // OSGEARTH_TIME_CONTROL_H