how can I know which object caused a specific event ?

[Hossein]

Suppose I have 3 sliders on my form, they all so similar jobs, but with a slight difference based on which category the belong .
So one way is to create lets say 3 event handlers for their slider_move() event and then go on.
the other way which I am interested in, is create one event handler, and make all of these 3 use that.

so the signals must have the objects emitted as well, so that in the slot we can differentiate between multiple different objects

How is this second one achieved ?
how can I get the sender in this scenario?
I checked the signal doesn't have a QObject parameter, and I don't want to re-implement the widgets each time I need such capability)?

Thanks in advance