#ifndef _QOSGGRAPHICS_H_
#define _QOSGGRAPHICS_H_

#include <osgViewer/Viewer>
#include <osgViewer/CompositeViewer>

#include <QtCore/QString>
#include <QtCore/QTimer>
#include <QtGui/QKeyEvent>
#include <QtOpenGL/QGLWidget>
#include <QtGui/QGraphicsView>
#include <QtGui/QGraphicsScene>

using Qt::WindowFlags;

namespace osg
{

	/** Adapte Qt events to OSG. */
	class QAdapterScene : public QGraphicsScene
	{
	public:
		QAdapterScene(QObject* parent = 0);
		QAdapterScene( const QRectF & sceneRect, QObject * parent = 0 );
		QAdapterScene( qreal x, qreal y, qreal width, qreal height, QObject * parent = 0 );

		osgViewer::GraphicsWindow* getGraphicsWindow() { return _gw.get(); }
		const osgViewer::GraphicsWindow* getGraphicsWindow() const { return _gw.get(); }
		virtual void resizeEvent( QResizeEvent* event );

		static osgGA::GUIEventAdapter::KeySymbol convertSymbol(int);

	protected:
		virtual void keyPressEvent( QKeyEvent* event );
		virtual void keyReleaseEvent( QKeyEvent* event );
		virtual void mousePressEvent( QGraphicsSceneMouseEvent* event );
		virtual void mouseReleaseEvent( QGraphicsSceneMouseEvent* event );
		virtual void mouseMoveEvent( QGraphicsSceneMouseEvent* event );

	protected:
		osg::ref_ptr<osgViewer::GraphicsWindowEmbedded> _gw;
	};

	/** OSG and OpenGL staff.
	 *	Draw OpenGL as background, all widgets or else are drawn on top (see widget opacity). */
	class QOSGScene : public QAdapterScene, public osgViewer::Viewer
	{
	public:
		QOSGScene(QObject* parent = 0);
		QOSGScene( const QRectF & sceneRect, QObject * parent = 0 );
		QOSGScene( qreal x, qreal y, qreal width, qreal height, QObject * parent = 0 );
		virtual void drawBackground ( QPainter * painter, const QRectF & rect );

	protected:
		virtual void init(qreal x, qreal y, qreal width, qreal height);
		QTimer _timer;
	};

	/** OSG and OpenGL staff.
	 *	Draw OpenGL as background, all widgets or else are drawn on top (see widget opacity). */
	class QOSGCompositeScene : public QAdapterScene, public osgViewer::CompositeViewer
	{
	public:
		QOSGCompositeScene(QObject* parent = 0);
		QOSGCompositeScene( const QRectF & sceneRect, QObject * parent = 0 );
		QOSGCompositeScene( qreal x, qreal y, qreal width, qreal height, QObject * parent = 0 );
		virtual void drawBackground ( QPainter * painter, const QRectF & rect );

	protected:
		virtual void init();
		QTimer _timer;
	};

	/** Provide a view in a Qt gui.
	 *	Enbale using the powerfull of QGraphics intruduce since Qt4.4.
	 *	Enable the possibility to create HUD with Qt.
	 *	this code is base on the purpose of the Qt Quaterly 26. */
	class QGLGraphicsView : public QGraphicsView
	{
	public:
		QGLGraphicsView(QWidget * parent = 0);
		QGLGraphicsView(QOSGScene * scene, QWidget * parent = 0);
	protected:
		virtual void resizeEvent( QResizeEvent* event );
	};

};

#endif // _QOSGGRAPHICS_H_