Tkinter listbox clicking problem
Russell E. Owen
owen at nospam.invalid
Fri Sep 13 21:55:29 CEST 2002
In article <sGog9.307183$aA.53945 at sccrnsc02>,
"Matthew Bonig" <mbonig at hotmail.com> wrote:
>Right now I have it bound so when a Tkinter listbox gets a <Button-1>
>(lb.bind("<Button-1>", someFunc)) it calls function someFunc. Now,
>someFunc() simply prints the curselection(). The problem is it's lagged...
>if I first select list item 1 (index 0), and then 2, and then 3 (array
>indexes 0,1,2) it prints out themout incorrectly.
>(I have someFunc actually do some try, except stuff so I don't get uncaught
>exceptions) Instead of printing 0,1,2 it prints "nothing selected", 0, 1.
>The function get's called before the listbox updates it's selection markers!
>Does anybody know how I could force listbox to update it's selection markers
>so instead of printing "nothing selected, 0,1 it prints 0,1,2 like it
I'm hoping somebody has better ideas, but here are some to try:
Call update_idletasks before you ask for the selection. I have no idea
if this will work, but it might.
An ugly solution that would probably work:
- extract the y coordinate from the event callback
- call nearest(y_coord) to get the item closest to the mouse click
- explicitly select that index item. You could try skipping this step,
but you risk a possible error between what you think they clicked on and
what is hightlighted. Unfortunately, this step will may be a real pain
for a list that supports multiple selected items.
Poll for selection changes -- thus it may take a bit of time before your
code notices a change, but it will always be right once it gets there.
More information about the Python-list