//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 OSGUTIL_GUIEVENTADAPTER
#define OSGUTIL_GUIEVENTADAPTER 1 

#include <osg/Referenced>
#include <osgUtil/Export>

namespace osgUtil{


/** Pure virtual base class for adapting platform specific events into
  * generic keyboard and mouse events. 
  *
  * Used as GUI toolkit independent input into the osgUtil::CameraManipualor's.
  * For an example of how GUIEventAdapter is specialised for a particular GUI
  * Toolkit see osgGLUT::GLUTEventAdapter.
  */
class GUIEventAdapter : public osg::Referenced
{
    public:

        GUIEventAdapter() {}


        enum MouseButtonMask { 
            LEFT_MOUSE_BUTTON=1,
            MIDDLE_MOUSE_BUTTON=2,
            RIGHT_MOUSE_BUTTON=4
        };

        enum EventType {
            PUSH,
            RELEASE,
            DRAG,
            MOVE,
            KEYBOARD,
            FRAME,
            RESIZE,
            NONE
        };

        /** Get the EventType of the GUI event.*/
        virtual EventType getEventType() const = 0;

        /** key pressed, return -1 if inappropriate for this event. */
        virtual int getKey() const = 0;

        /** button pressed/released, return -1 if inappropriate for this event.*/
        virtual int getButton() const = 0;

        /** window minimum x. */
        virtual int getXmin() const = 0;

        /** window maximum x. */
        virtual int getXmax() const = 0;

        /** window minimum y. */
        virtual int getYmin() const = 0;

        /** window maximum y. */
        virtual int getYmax() const = 0;

        /** current mouse x position.*/
        virtual int getX() const = 0;

        /** current mouse y position.*/
        virtual int getY() const = 0;

        /** current mouse button state */
        virtual unsigned int getButtonMask() const = 0;

        /** time in seconds of event. */
        virtual double time() const = 0;


    protected:
    
        /** Force users to create on heap, so that multiple referencing is safe.*/
        virtual ~GUIEventAdapter() {}

};

}

#endif