[PyQt] can't get findChild to work

[Matt Newell]

On Tuesday 08 June 2010 15:29:53 Danny Shevitz wrote:
> Howdy,
> 
> 
> 
> Another newbie question here. I am trying to get findChild to work. The
> code I am trying is
> 
> 
> 
> app=QtGui.QApplication.instance()
> 
> print app.allWidgets()
> 
> mdiArea=app.findChild(QtGui.QMdiArea)
> 
> print "in ElicitorPage, mdiArea = ",  mdiArea
> 
> 
> 
> As can be seen, I am getting the global application object, then printing
> all of its widgets (it is an MDI application with
> 
> a QMdiArea widget as the central widget). Then I try to find the QMdiArea
> widget. I don't believe I need a name in findChild
> 
> since the defaults to "" which matches all instances. I also tried with a
> name, and it didn't work for me anyway. In any case, here is the output
> 
> of the code:
> 
> 
> 
> [<PyQt4.QtGui.QMenu object at 0x013F4108>, <PyQt4.QtGui.QMenu object at
> 0x013F4078>,  .
> 
>  <PyQt4.QtGui.QMdiArea object at 0x013D1AE0>]
> 
> in ElicitorPage, mdiArea =  None
> 
> 
> 
> As you can see, there is clearly a QMdiArea widget in app.allWidgets, and
> yet the findChild method doesn't return it.
> 
> Can anyone tell me what I am doing wrong?
> 

I think the problem is that the top level widgets aren't really children of 
the application from a QObject parent<->child standpoint.  The way to do this 
would be to loop through app.topLevelWidgets() calling findChild on each.

Matt