#include <QApplication>
#include <QGraphicsView>
#include <QGraphicsScene>
#include <QMainWindow>
#include <QDragEnterEvent>
#include <QDropEvent>
#include <QMessageBox>


class View
	:	public QGraphicsView
{
public:
	View( QWidget * parent )
		:	QGraphicsView( parent )
	{
		setAcceptDrops( true );
		setDragMode( QGraphicsView::ScrollHandDrag );
	}

protected:
	void dragEnterEvent( QDragEnterEvent * event )
	{
		event->acceptProposedAction();
	}

	void dropEvent( QDropEvent * event )
	{
		QMessageBox::information( this, tr( "Drop" ),
			tr( "You just dropped something to me." ) );

		event->acceptProposedAction();
	}
};


class Window
	:	public QMainWindow
{
public:
	Window()
	{
		View * view = new View( this );
		view->setAlignment( Qt::AlignLeft | Qt::AlignTop );

		QGraphicsScene * scene = new QGraphicsScene( this );

		view->setScene( scene );

		setCentralWidget( view );
	}
};

int main( int argc, char ** argv )
{
	QApplication app( argc, argv );

	Window w;
	w.show();

	return app.exec();
}