This is probably really simple but I haven't yet figured it out. It
happens in the context of a much larger program but stripped to it's
essence is per the little program below.
The general idea is that the user clicks on a button, that initiates an
operation which is going to take some time, so I would like to allow the
user to press ESCAPE to cancel the operation. In the code below the
"on_button" function is the one that takes some time, but if the user
presses ESCAPE while it is running, the escape isn't processed until
*after* the "on_button" function returns which sort of defeats the
purpose. I've tried inserting update_idletasks() into the function and
various other things without success.
Any suggestions? I'm running Python 2.4.2 under Linux.
Thanks
Cam Farnell
- - - - -
from Tkinter import *
import time
def on_button():
for J in range(10):
print J
if CancelNow:
break
time.sleep(1)
def Cancel(Event):
print 'Cancelling now'
CancelNow = True
Root.quit()
Root = Tk()
Root.bind_all('<Key-Escape>',Cancel)
B = Button(Root,command=on_button,text='Go')
B.pack()
CancelNow = False
Root.mainloop()
_______________________________________________
Tkinter-discuss mailing list
Tkinter-discuss@python.org
http://mail.python.org/mailman/listinfo/tkinter-discuss
