[Tkinter-discuss] New member howdy And is there a better way to use Buttons ?
jedens at cabinc.com
Thu Jun 12 19:56:41 CEST 2008
That is exactly what I was looking for - seems like something that should go into the wiki!
From: Bob Greschke [mailto:bob at passcal.nmt.edu]
Sent: Thursday, June 12, 2008 11:52 AM
To: John Edens
Cc: tkinter-discuss at python.org
Subject: Re: [Tkinter-discuss] New member howdy And is there a better way to use Buttons ?
On Jun 11, 2008, at 13:52, John Edens wrote:
> Hi all, I've just started working with Python and Tkinter.
> One of the things I think I've noted is that Button commands do not
> pass parameters.
> Is there a way around this?
> And is there a better way to code the following:
> I've written a small application that puts a Label in row 0 of a
> Frame and puts 26 buttons labeled A - Z in the second row.
> When the user clicks on a button, the associated letter is displayed
> in the label.
I use (stolen from several places in Python history):
# BEGIN: class Command
# Pass arguments to functions from button presses and menu selections!
# In your declaration: ...command = Command(func, args,...)
# Also use in bind() statements
# x.bind("<****>", Command(func, args...))
def __init__(self, func, *args, **kw):
self.func = func
self.args = args
self.kw = kw
def __call__(self, *args, **kw):
args = self.args+args
apply(self.func, args, kw)
# END: class Command
then for a button you would do
Button(Frame, text = "BLAH B", command = Command(doBlah,
"B")).pack(side = LEFT)
Button(Frame, text = "BLAH C", command = Command(doBlah,
"C")).pack(side = LEFT)
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