How to make the bounding rect of a selected qgraphicsitem show automatically?

Question

I found this example by @serge_gubenko in SO. Moving a QGraphicsItem around a central point in PyQt4

I did then some modifications to end up with: Why is my QGraphicsItem not selectable?

If I run the example (Moving a QGraphicsItem around a central point in PyQt4) and click on the graphics item, it automatically shows up with a dashed frame which indicates that it is selected. I prepared images to show the effect, but due to my low reputation I am not yet allowed to upload those ;)

To me it looks that this "is selected indication" by the dashed frame comes automatically somehow. In my modified example (Why is my QGraphicsItem not selectable?), this does not happen and I can't figure out why?

Answer 1

You use QtGui.QGraphicsItem, so you define the boundingRect and paint methods, where you used the painter drawEllipse method. In the first example you found, the class uses directly QtGui.QGraphicsEllipseItem and it does all the difference, because those methods are already defined. By the way I didn't find why the boundingRect is not drawn in your case.