* Dr. Benjamin David Clarke:
I currently have a program that reads in values for an OptionMenu from
a text file. I also have an option to add a line to that text file
which corresponds to a new value for that OptionMenu. How can I make
that OptionMenu update its values based on that text file without
restarting the program? In other words, every time I add a value to
the text file, I want the OptionMenu to immediately update to take
note of this change. I'll provide code if needed.
It's a bit unclear to me whether the update of the text file is from within the
process as where the menu is, or not.
If the problem is connecting file updates to menu changes:
If it's the same process, perhaps you can wrap all access of the text file so
that whenever an operation to change the text file is performed, it calls back
on interested parties (like event handling)?
If it's not the same process you need some "file changed" notification.
Windows has this functionality. I don't know if it's there in *nix. Anyway,
since I'm still essentially a Python newbie I don't know of any Python modules
for such functionality, if that's what you need. But perhaps someone else does...
Otherwise, if the problem is actually updating the menu, and it is a tkinter
OptionMenu:
It appears that an OptionMenu has a logical attribute 'menu' that is a tkinter
Menu, representing the options; if your OptionMenu is an object 'o' then you can
write 'o["menu"]' or 'o.cget( "menu" )' to get at that logical attribute. And
tkinter Menu has various methods that you can use to inspect or update the menu;
see <url: http://effbot.org/tkinterbook/menu.htm>. Disclaimer: I haven't tried
updating, but I see no reason why it shouldn't work. :-)
Cheers & hth.,
- Alf
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