[PyQt] Newbie: get one of several QDockWidgets to perform action on

[Knacktus]

Hi everyone,

I'm kind of stuck to find the best approach for handling multiple 
dockwidgets.

Imagine this case: I have a QMainWindow with two QDockWidgets. Each 
QDockWidget contains one QTreeView. Now I'd like to implement a button 
"Expand all" that calls a method "expand_all()" which in turn triggers 
the ExpandAll slot of the QTreeView which is active.

I think I need to identify the QDockWidget, which had focus when I 
pressed the button. I've tried the following approaches:

1) qApp.hasFocus() in my "expand_all()" method --> didn't work, gives 
the focus of the button I pressed

2) qApp.activeWindow() --> didn't work, gives the QMainWindow

Overall, I have a bit of a lack of understanding what's "active" and 
"focus" means in the context of QDockWidgets. Hints to documentation is 
appreciated.

Thanks in advance and cheers,

Jan