QGraphicsItem or QGraphicsProxyWidget?

[ttvo]

Hi,

I need to create an image as below
Attachment 3604
It contains:
1) one or more nodes with a text label. The node is not filled when created, but will be filled with progress
2) there are one or more ports on each node connecting them together

I first looked at the Diagram Scene example, but I'll need the port(s) to know which node connecting to which port and also need to add text to the node.

Should I subclass QGraphicsItem or QGraphicsProxyWidget or something else? Thanks in advance.