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Jorge Louis De Castro napsal(a):
<blockquote cite="midBAY102-DAV1161C9E9554D6F6B227716D7B10@phx.gbl"
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<div><font face="Arial" size="2">Hi,</font></div>
<div> </div>
<div><font face="Arial" size="2">I have an optionmenu widget that
works just fine except that can't find docs to get hold of events as
they happen, kinda like the command=XYZ of other widgets like buttons.</font></div>
<div> </div>
<div><font face="Arial" size="2">The code I'm using for the option
menu is the following:</font></div>
<div> </div>
<div><font face="Arial" size="2">OPTIONS =
["en","pt","es","it","fr","de"]<br>
self.startw.variable = StringVar()<br>
self.startw.variable.set(OPTIONS[0]) # default value<br>
self.startw.whis_butt=apply(OptionMenu, (self.startw,
self.startw.variable) + tuple(OPTIONS))<br>
self.startw.whis_butt.grid(column=1, row=3)</font></div>
<div> </div>
<div><font face="Arial" size="2">Now I'd like to have a function like:</font></div>
<div> </div>
<div><font face="Arial" size="2">def onChange(self):</font></div>
<div><font face="Arial" size="2"> # do optionmenu specific stuff</font></div>
<div> </div>
<div><font face="Arial" size="2">but can't find how to do it, how to
associate/bind onChange with the optionmenu widget.</font></div>
<div><font face="Arial" size="2">Any help will be highly appreciated.</font></div>
<div> </div>
</blockquote>
This art is called Trace Variable and could be used like this (copied
and rearranged from one of the prevously posted message from here):<br>
<tt><br>
from Tkinter import *<br>
<br>
OPTIONS = [<br>
"egg",<br>
"bunny",<br>
"chicken"<br>
]<br>
<br>
def callbackFunc(name, index, mode):<br>
#print "callback called with name=%r, index=%r, mode=%r" % (name,
index, mode)<br>
varValue = root.getvar(name)<br>
print varValue<br>
# modify the value, just to show it can be done<br>
#root.setvar(name, varValue)<br>
<br>
root = Tk()<br>
var = StringVar()<br>
var.set(OPTIONS[2]) # default value<br>
rememberMe = var.trace_variable('w', callbackFunc) <br>
# var.trace('w', callbackFunc) # this works, too<br>
<br>
<br>
<br>
w = OptionMenu (root, var, *OPTIONS)<br>
w.pack()<br>
<br>
<br>
root.mainloop()<br>
</tt><br>
Hope its what you asked for :-)<br>
<pre class="moz-signature" cols="100">--
geon
</pre>
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