/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library 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 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGVIEWER_SCENE
#define OSGVIEWER_SCENE 1

#include <osgUtil/UpdateVisitor>
#include <osgGA/GUIEventHandler>
#include <osgGA/EventVisitor>
#include <osgDB/DatabasePager>

#include <osgViewer/Export>

#include <list>

namespace osgViewer{

// WARNING ** Under development do not use, yet :-) 

/** Scene holds the highe level reference to a single scene graph.*/
class OSGVIEWER_EXPORT Scene : public virtual osg::Referenced
{
    public:

        Scene();
        virtual ~Scene();

        void setSceneData(osg::Node* node);
        osg::Node* getSceneData();
        const osg::Node* getSceneData() const;

        osg::FrameStamp* getFrameStamp() { return _frameStamp.get(); }

        void setEventQueue(osgGA::EventQueue* eventQueue) { _eventQueue = eventQueue; }
        osgGA::EventQueue* getEventQueue() { return _eventQueue.get(); }
        const osgGA::EventQueue* getEventQueue() const { return _eventQueue.get(); }

        typedef std::list< osg::ref_ptr<osgGA::GUIEventHandler> > EventHandlers;
        
        void addEventHandler(osgGA::GUIEventHandler* eventHandler);
        EventHandlers& getEventHandlers() { return _eventHandlers; }
        const EventHandlers& getEventHandlers() const { return _eventHandlers; }

        void setDatabasePager(osgDB::DatabasePager* dp);
        osgDB::DatabasePager* getDatabasePager() { return _databasePager.get(); }
        const osgDB::DatabasePager* getDatabasePager() const { return _databasePager.get(); }

        virtual void frameAdvance();
        virtual void frameEventTraversal();
        virtual void frameUpdateTraversal();

    public:

        void init();

    protected:
    
        bool                                _firstFrame;
        osg::Timer_t                        _startTick;
        osg::ref_ptr<osg::FrameStamp>       _frameStamp;

        osg::ref_ptr<osg::Node>             _sceneData;

        osg::ref_ptr<osgUtil::UpdateVisitor>  _updateVisitor;

        osg::ref_ptr<osgGA::EventQueue>     _eventQueue;
        osg::ref_ptr<osgGA::EventVisitor>   _eventVisitor;

        osg::ref_ptr<osgDB::DatabasePager>  _databasePager;

        EventHandlers                       _eventHandlers;
    
};


}

#endif