//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSGGA_CAMERAMANIPULATOR
#define OSGGA_CAMERAMANIPULATOR 1

#include <osg/Camera>
#include <osg/Node>

#include <osgGA/Export>
#include <osgGA/GUIEventHandler>
#include <osgGA/GUIEventAdapter>
#include <osgGA/GUIActionAdapter>

namespace osgGA{

class OSGGA_EXPORT CameraManipulator : public GUIEventHandler
{
    public:

	CameraManipulator();
	virtual ~CameraManipulator();

        /** attach a camera to the manipulator to be used for specifying view.*/
	virtual void setCamera(osg::Camera*);

        /** get the attached camera.*/
	virtual const osg::Camera * getCamera() const;

        /** get the attached camera.*/
	virtual osg::Camera * getCamera();

        /** Attach a node to the manipulator. 
            Automatically detaches previously attached node.
            setNode(NULL) detaches previously nodes.
            Is ignored by manipulators which do not require a reference model.*/
        virtual void setNode(osg::Node*) {}

        /** Return node if attached.*/
        virtual const osg::Node* getNode() const { return NULL; }

        /** Return node if attached.*/
        virtual osg::Node* getNode() { return NULL; }

        /** Move the camera to the default position. 
            May be ignored by manipulators if home functionality is not appropriate.*/
        virtual void home(const GUIEventAdapter& ,GUIActionAdapter&) {}
        
        /** Start/restart the manipulator.*/
        virtual void init(const GUIEventAdapter& ,GUIActionAdapter&) {}

        /** Handle events, return true if handled, false otherwise.*/
	virtual bool handle(const GUIEventAdapter& ea,GUIActionAdapter& us);

        /** Handle visitations */
        virtual void accept(GUIEventHandlerVisitor& v)    { v.visit(*this); }


    protected:

	// Reference pointer to a camera
	osg::ref_ptr<osg::Camera>	_camera;

};

}

#endif