--------- Mensaje reenviado --------
> De: Michael Lange <klappn...@web.de>
> Para: tkinter-discuss@python.org
> Asunto: Re: [Tkinter-discuss] lambda function to simplify
> Fecha: Fri, 17 Dec 2010 22:30:44 +0100
>
> Hi,
>
> Thus spoketh craf <p...@vtr.net>
> unto us on Fri, 17 Dec 2010 15:16:22 -0300:
>
> (...)
> > I have access to the function (greeting) from the button and the window
> > close button.
> >
> > It works fine, but wanted to know whether the use of lambda (lambda),
> > can be expressed in another way more elegant and less confusing.
> >
>
> If I understand you correctly, your problem is that the event callback
> receives the event instance as argument but the wm_protocol() doesn't?
> You can circumvent this by defining a default value for the event
> parameter, as in:
>
> class App:
> def __init__(self, master):
> self.root = master
> self.b1 = Tkinter.Button(master)
> self.b1.pack()
> self.b1.bind('<Button-1>', self.foo)
> self.root.protocol('WM_DELETE_WINDOW', self.foo)
>
> def foo(self, event=None):
> greeting(self)
>
> In most cases it is probably even better (and less confusing) to avoid
> calling externally defined functions whereever possible and define prefer
> class methods instead, as in:
>
> class App:
> def __init__(self, master):
> self.root = master
> self.b1 = Tkinter.Button(master)
> self.b1.pack()
> self.b1.bind('<Button-1>', self.foo)
> self.root.protocol('WM_DELETE_WINDOW', self.foo)
>
> def foo(self, event=None):
> self.root.destroy()
>
> BTW, I am not sure if you are aware of this, root.destroy() is already
> defined as default callback for WM_DELETE_WINDOW in Tkinter.py, so it's
> kind of redundant here; although it won't make much difference in most
> situations, some people say the canonical way ending a Tkinter app is to
> end the mainloop with root.quit() instead and destroy() the window
> after the mainloop ended, as in:
>
> root = Tk()
> root.protocol('WM_DELETE_WINDOW', root.quit)
> (...)# a lot of code here
> root.mainloop()
> root.destroy()
>
> That's what they do in IDLE, for example.
>
> Regards
>
> Michael
>
>
>
> .-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-.
>
> Without facts, the decision cannot be made logically. You must rely on
> your human intuition.
> -- Spock, "Assignment: Earth", stardate unknown
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Hi Michael.
Sorry, I do not explain well what I wanted ;=)
My guess is that if the instruction...
self.root.protocol('WM_DELETE_WINDOW', lambda:((lambda
e,widget=self:greeting(widget))(self.root)))
can be shortened to occupy the same line?
It's for a better understanding of the code.
Regards
Cristian Abarzúa
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