Problem in MouseMoveEvent

[jpn]

#include <QtGui>
 
class MainWindow : public QMainWindow
{
public:
	MainWindow(QWidget* parent = 0) : QMainWindow(parent)
	{
		QGraphicsScene* scene = new QGraphicsScene;
		QGraphicsItem* item = scene->addText("Item");
		item->setFlag(QGraphicsItem::ItemIsMovable); 
 
		view = new QGraphicsView(scene);
		view->viewport()->installEventFilter(this);
		// this is not actually even needed, QGraphicsView 
		// already sets the mouse tracking on on it's viewport
		view->viewport()->setMouseTracking(true);
		setCentralWidget(view);
	}
 
	bool eventFilter(QObject* object, QEvent* event)
	{
		if (event->type() == QEvent::MouseMove)
		{
			QMouseEvent* mouse = static_cast<QMouseEvent*>(event);
			QPointF pos = view->mapToScene(mouse->pos());
			statusBar()->showMessage(QString("(%1,%2)").arg(pos.x()).arg(pos.y()));
		}
		return false;
	}
 
private:
	QGraphicsView* view;
};
 
int main(int argc, char* argv[])
{
	QApplication app(argc, argv);
	MainWindow w;
	w.show();
	return app.exec();
}

#include <QtGui>

class MainWindow : public QMainWindow
{
public:
	MainWindow(QWidget* parent = 0) : QMainWindow(parent)
	{
		QGraphicsScene* scene = new QGraphicsScene;
		QGraphicsItem* item = scene->addText("Item");
		item->setFlag(QGraphicsItem::ItemIsMovable); 
		
		view = new QGraphicsView(scene);
		view->viewport()->installEventFilter(this);
		// this is not actually even needed, QGraphicsView 
		// already sets the mouse tracking on on it's viewport
		view->viewport()->setMouseTracking(true);
		setCentralWidget(view);
	}

	bool eventFilter(QObject* object, QEvent* event)
	{
		if (event->type() == QEvent::MouseMove)
		{
			QMouseEvent* mouse = static_cast<QMouseEvent*>(event);
			QPointF pos = view->mapToScene(mouse->pos());
			statusBar()->showMessage(QString("(%1,%2)").arg(pos.x()).arg(pos.y()));
		}
		return false;
	}

private:
	QGraphicsView* view;
};

int main(int argc, char* argv[])
{
	QApplication app(argc, argv);
	MainWindow w;
	w.show();
	return app.exec();
}

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