//##################################################################################################
//
//   Custom Visualization Core library
//   Copyright (C) 2011-2012 Ceetron AS
//    
//   This library is free software: you can redistribute it and/or modify 
//   it under the terms of the GNU General Public License as published by 
//   the Free Software Foundation, either version 3 of the License, or 
//   (at your option) any later version. 
//    
//   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 GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>> 
//   for more details. 
//
//##################################################################################################

#pragma once

#include "cvfAssert.h"
#include "cvfBase.h"
#include "cvfObject.h"
#include "cvfVector3.h"

#include <QPointer>

namespace caf {
    class Viewer;
}

class QInputEvent;

namespace caf
{

class NavigationPolicy : public cvf::Object  
{
    friend class Viewer;
public: // protected: // Should be protected but this friending does not work on gcc 4.1.2

    // Interface to be implement by subclass
    virtual void         init() {};
    virtual bool         handleInputEvent(QInputEvent* inputEvent) = 0;
    virtual void         setView( const cvf::Vec3d& alongDirection, const cvf::Vec3d& upDirection ) = 0;
    virtual cvf::Vec3d   pointOfInterest(); 
    virtual void         setPointOfInterest(cvf::Vec3d poi) = 0;

    // Interface used by caf::ViewerBase
    void                 setViewer(Viewer* viewer) { m_viewer = viewer; init(); }
    QPointer<Viewer> m_viewer;
};

} // End namespace caf
