[ python-Bugs-1482402 ] Forwarding events and Tk.mainloop problem

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Bugs item #1482402, was opened at 2006-05-05 11:15
Message generated for change (Comment added) made by mkiever
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Category: Tkinter
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Matthias Kievernagel (mkiever)
Assigned to: Martin v. Löwis (loewis)
Summary: Forwarding events and Tk.mainloop problem

Initial Comment:
(Python 2.4.1, tcl/tk 8.4 on Linux)

I try to create a widget class (Frame2 in the example)
containing a Listbox.
This should report an event '<<ElementSelect>>'
when the Listbox produces '<<ListboxSelect>>'
or when the selection changes using the Up/Down keys.
(see example script)

Binding '<<ElementSelect>>' to the Frame2 widget
produces the following traceback when the
event is generated:

------------------
listbox select
event generated
Traceback (most recent call last):
  File "testevent.py", line 98, in ?
    tk.mainloop ()
  File "/usr/local/lib/python2.4/lib-tk/Tkinter.py", 
line 965, in mainloop
    self.tk.mainloop(n)
  File "/usr/local/lib/python2.4/lib-tk/Tkinter.py", 
line 1349, in __call__
    self.widget._report_exception()
  File "/usr/local/lib/python2.4/lib-tk/Tkinter.py", 
line 1112, in _report_exception
    root = self._root()
AttributeError: Tk instance has no __call__ method
-----------------

So Tkinter tries to report an exception
caused by the event, but fails to do so
by a second exception in _report_exception.
(not quite sure I did understand this)
The first exception may be a problem with
my code or tcl/tk but at least the second
is a problem of Tkinter.

If you bind '<<ElementSelect>>' to Tk itself
the example works fine.


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>Comment By: Matthias Kievernagel (mkiever)
Date: 2007-01-19 15:43

Message:
Logged In: YES 
user_id=1477880
Originator: YES

I just found the time to re-investigate my reported bug
and found out that it is due to a subclassing error
of my own (redefine of Misc._root()).
Sorry, for the false report.
Can someone delete/reject or shoot it down?

Greetings,
Matthias Kievernagel


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