How to write custom singnal and slots for custom QGraphicsPolygonItem?

[opengpu]

how to write custom singnal and slots for custom QGraphicsPolygonItem?
i found that QGraphicsPolygonItem is not inherited from QObejct...
and i tried add Q_OBJECT for my class, and compiled wrong...

[jalomic]

You can inherit QGraphicsPolygonItem from QObject yourself

[andreyc]

As jalomic suggested inherit you custom QGraphicsPolygonItem from both classes QObject and QGraphicsPolygonItem

Please note that QObject must be first in the inheritance chain. Otherwise moc will not recognize it.
@
class MyGPI : public QObject, public QGraphicsPolygonItem
{
Q_OBJECT
public:
...
}
@