Terry J. Reedy added the comment:
I did some experiments that cleared up some previous puzzlements about
seemingly inconsistent behavior between interactive commands and those in
scripts. The following prints '.mycombo' twice, on two lines, after selecting
'beta'.
import tkinter as tk
from tkinter import ttk
root = tk.Tk()
#root.withdraw()
cb = ttk.Combobox(root, name='mycombo', values=('alpha', 'beta'))
cb.pack()
def here(event): print(event.widget)
cb.bind('<<ComboboxSelected>>', here)
cb.set('none')
root.update()
cb.event_generate('<Button-1>')
root.update()
cb.event_generate('<Key-Down>')
root.update()
cb.event_generate('<Key-Return>')
root.update()
cb.event_generate('<<ComboboxSelected>>')
root.update()
cb.set does *not* trigger ComboboxSelected. Key_Return after Button-1 does.
So does directly generating the event.
Uncomment .withdraw() and Key-Return does not trigger. But the directly
generating the pseudoevent still works. About a month ago, I added .withdraw
to tests to stop (obnoxious) screen flashes. I don't call it for shell
interaction. Removing at least some of the .update()s will also stop
triggering. In IDLE's interactive mode, tcl update is called 20 times a
second, which is at least once per statement types and entered. Hence scripted
and interactive statements had different effects.
Directly simulating user actions is more satisfying than generating the
pseudoevent, but IDLE tests do not need to verify that Combobox works as
advertised -- there is a ttk gui test for that. So I believe set('value') +
generate('ComboboxSelected') should be sufficient on the input end (after
conversion to Combobox and event binding).
----------
_______________________________________
Python tracker <[email protected]>
<http://bugs.python.org/issue27755>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
