Il Mon, 31 Oct 2005 19:23:18 +0000, Steve Holden ha scritto: > Francesco Bochicchio wrote: >> Il Mon, 31 Oct 2005 06:23:12 -0800, [EMAIL PROTECTED] ha scritto: >> >> >>>And yet the stupidity continues, right after I post this I finnally >>>find an answer in a google search, It appears the way I seen it is to >>>create a class for each button and have it call the method within that. >>>If anyone else has any other ideas please tell. >> >> >> This is how I do it: Supposing I have three buttons b1, b2 and b3, and I >> want for each button to call the same callback with, as argument, the >> button itself: >> >> >> def common_callback(button): >> # callback code here >> >> >> class CallIt(objetc): >> def __init__(function, *args ): >> self.function, self.args = function, args >> def __call__(self, *ignore): >> self.function(button, *self.args) >> >> b1['command']= CallIt(common_callback, b1) >> b2['command']= CallIt(common_callback, b2) >> b3['command']= CallIt(common_callback, b3) >> >> This way you need only one class (a sort of custom callable) and >> its instances gets called by Tkinter and in turn calls your >> callback with the proper arguments. >> > I don't see why this is preferable to having the callback as a bound > method of the button instances. What's the advantage here? It looks > opaque and clunky to me ... > > regards > Steve
I'm not saying that my method is better or even 'preferable'. Just different. The reason I came up this approach (years ago) is because I was used to other toolkits that always pass the widget as argument of the callback. So this was a fast solution to 'normalize' Tkinter with respect to what I perceived (and still do) as a limitation. As a bonus, you can also pass to the callback as many other arguments as you want. Another reason is that my basic approach to coding GUI is to use a class for each window. To put the code to handle button callbacks in a separate class feels to me a bit too much dispersive and potentially cumbersome if callback code has to interact with other window elements (although in Python nothing is impossible). Ciao ----- FB why I sometime -- http://mail.python.org/mailman/listinfo/python-list
