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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_MAP_CALLBACK_H
#define OSGEARTH_MAP_CALLBACK_H 1

#include <osgEarth/Common>
#include <osg/ref_ptr>
#include <list>

namespace osgEarth
{
    class MapInfo;
    class ImageLayer;
    class ElevationLayer;
    class ModelLayer;
    class MaskLayer;
    struct MapModelChange;

    /**
     * Callback that the Map object uses to notify listeners of map data model changes.
     */
    struct OSGEARTH_EXPORT MapCallback : public osg::Referenced
    {
        virtual void onMapInfoEstablished( const MapInfo& mapInfo ) { } 

        // callbacks for begin/end batch update operations.
        virtual void onBeginUpdate() { }
        virtual void onEndUpdate() { }

        virtual void onMapModelChanged( const MapModelChange& change );

        virtual void onImageLayerAdded( ImageLayer* layer, unsigned int index ) { }
        virtual void onImageLayerRemoved( ImageLayer* layer, unsigned int index ) { }
        virtual void onImageLayerMoved( ImageLayer* layer, unsigned int oldIndex, unsigned int newIndex ) { }

        virtual void onElevationLayerAdded( ElevationLayer* layer, unsigned int index ) { }
        virtual void onElevationLayerRemoved( ElevationLayer* layer, unsigned int index ) { }
        virtual void onElevationLayerMoved( ElevationLayer* layer, unsigned int oldIndex, unsigned int newIndex ) { }

        virtual void onModelLayerAdded( ModelLayer* layer, unsigned int index ) { }
        virtual void onModelLayerRemoved( ModelLayer* layer ) { }
        virtual void onModelLayerMoved( ModelLayer* layer, unsigned int oldIndex, unsigned int newIndex ) { }

        virtual void onMaskLayerAdded( MaskLayer* mask ) { }
        virtual void onMaskLayerRemoved( MaskLayer* mask ) { }

        /** dtor */
        virtual ~MapCallback() { }
    };

    typedef std::list< osg::ref_ptr<MapCallback> > MapCallbackList;
}

#endif // OSGEARTH_MAP_CALLBACK_H