Tkinter binding list

[Rodrigo Benenson]

Hi,

I have a weird need in tkinter. If I have a widget I can *set* a binding

..bind("<the event>", the_callback)
I also can *append* a binding

..bind("<the event>", the_second_callback, "+")

but now, I need to *replace* a callback. The easier way is to obtain the
bindings, delete them all, and rebind the new list.

So, how can I replace a callback, when there are more than one binding ?
or, as an equivalente question,

how can I obtain the list of callbacks binded to widget event ?

Thanks,
RodrigoB.

[Jeff Epler]

The bind method with one argument returns the string of tcl code that is
the current binding. For instance:

t = Tkinter.Tk()
t.bind("<<V>>", lambda evt: None) '136008116<lambda>' t.bind("<<V>>", lambda evt: None, "+") '136776692<lambda>' t.bind("<<V>>") 'if {"[136008116<lambda> %# %b %f %h %k %s %t %w %x %y %A %E %K %N %W %T
%X %Y %D]" == "break"} break\n\nif {"[136776692<lambda> %# %b %f %h %k
%s %t %w %x %y %A %E %K %N %W %T %X %Y %D]" == "break"} break\n'
The bind method with zero arguments returns all the existing bindings: t.bind()

('<<V>>',)

Jeff

[Eric Brunel]

Rodrigo Benenson wrote:

Hi,

I have a weird need in tkinter. If I have a widget I can *set* a binding

.bind("<the event>", the_callback)
I also can *append* a binding

.bind("<the event>", the_second_callback, "+")

but now, I need to *replace* a callback.

What's the difference between "setting" and "replacing" for you? If you set a
callback doing a "return 'break'" at the end, the event should execute your
binding and nothing else. Can you post a script showing exactly what you want to
do and what problems you have?
--
- Eric Brunel <eric dot brunel at pragmadev dot com> -
PragmaDev : Real Time Software Development Tools - http://www.pragmadev.com

[Rodrigo Benenson]

I mean replacing *one* of the callbacks for the event. Suposing that I do
not know which callbacks were previously set, except the one I want
remplace. If I *set* a callback, all the callback list will be erased.

This is a case in a plugin system. My plugin want to add a hook, but is
probable that other plugins already hooked they own callbacks. I do no want
to delete they callbacks but just to remplace the "root" callback (for which
I already have a reference).

I did this post because I found strange to do not found a way to do this,
maybe it should be a PEP for Tkinter ?

RodrigoB.

"Eric Brunel" <er*********@N0SP4M.com> escribió en el mensaje
news:br**********@news-reader5.wanadoo.fr...

Rodrigo Benenson wrote:

Hi,

I have a weird need in tkinter. If I have a widget I can *set* a binding

.bind("<the event>", the_callback)
I also can *append* a binding

.bind("<the event>", the_second_callback, "+")

but now, I need to *replace* a callback.
What's the difference between "setting" and "replacing" for you? If you

set a callback doing a "return 'break'" at the end, the event should execute your binding and nothing else. Can you post a script showing exactly what you want to do and what problems you have?
--
- Eric Brunel <eric dot brunel at pragmadev dot com> -
PragmaDev : Real Time Software Development Tools - http://www.pragmadev.com