New submission from Akuli <akuviljane...@gmail.com>:
The purpose of focus_get() is to return the widget that currently has the
focus. It tries to convert its result to a tkinter widget, which can fail,
because not all Tk widgets are known to tkinter. Consider this, for example:
import tkinter
def print_focused_widget():
print(repr(root.focus_get()))
root.after(1000, print_focused_widget)
root = tkinter.Tk()
menu = root["menu"] = tkinter.Menu()
menu.add_cascade(label="Click here", menu=tkinter.Menu())
print_focused_widget()
tkinter.mainloop()
Output, with menu clicked after a couple seconds (on Linux):
None
<tkinter.Tk object .>
<tkinter.Tk object .>
Exception in Tkinter callback
Traceback (most recent call last):
File "/home/akuli/.local/lib/python3.10/tkinter/__init__.py", line 1916,
in __call__
return self.func(*args)
File "/home/akuli/.local/lib/python3.10/tkinter/__init__.py", line 838,
in callit
func(*args)
File "/home/akuli/porcu/foo.py", line 4, in print_focused_widget
print(repr(root.focus_get()))
File "/home/akuli/.local/lib/python3.10/tkinter/__init__.py", line 782,
in focus_get
return self._nametowidget(name)
File "/home/akuli/.local/lib/python3.10/tkinter/__init__.py", line 1531,
in nametowidget
w = w.children[n]
KeyError: '#!menu'
Some nametowidget() calls in tkinter/__init__.py already handle this correctly.
Consider winfo_children(), for example:
try:
# Tcl sometimes returns extra windows, e.g. for
# menus; those need to be skipped
result.append(self._nametowidget(child))
except KeyError:
pass
----------
components: Tkinter
messages: 397199
nosy: Akuli
priority: normal
severity: normal
status: open
title: tkinter focus_get() with non-tkinter Tk widget
type: behavior
versions: Python 3.10
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44592>
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