[Tkinter-discuss] Canvas tag bindings not going away?
bob at passcal.nmt.edu
Tue Sep 1 22:08:42 CEST 2009
> If I understand you correctly, what you describe is what I think that
> tag bindings are supposed to do. I tried the following:
>>>> from Tkinter import *
>>>> c = Canvas()
>>>> def test(ev):
> ... print 'foo'
>>>> c.tag_bind('tag_foo', '<1>', test)
>>>> c.create_rectangle(0, 0, 100, 100, fill='blue', tags=('tag_foo'))
> The "foo"s at the end of the snippet are of course from clicking the
> blue rectangle. The point here is, that the tag-binding is obviously
> active without any items being created, and I believe that is exactly
> what it is for; if you want the binding to be removed when the item is
> deleted, you should bind to the item-id instead, or maybe use
> tag_unbind() to remove the bindings.
> I hope this helps
You are too smart. I've only been goofing with this stuff for about 7
years. Looking through my code I now understand that I didn't know
anything. :) I've been binding to the tag in some places and to the
"ID" of the create_x item in others. NOW I get it! That's exactly
what was going on. A big thanks!
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