* Dodo, on 07.06.2010 12:38:
Le 05/06/2010 19:07, Alf P. Steinbach a écrit :
* Dodo, on 05.06.2010 15:46:
Hi,
let's consider this exemple :
from tkinter import *
from tkinter.ttk import *
class First:
def __init__(self):
self.root = Tk()
B = Button(self.root, command=self.op)
B.pack()
self.root.mainloop()
def op(self):
Second(self)
print("print")
class Second:
def __init__(self, parent):
root = Toplevel(parent.root)
root.grab_set()
root.mainloop()
First()
when I close the second window, the print is NOT executed. It's done
when I close the first window.
Why do it "freeze" my function?
First, sorry about Thunderbird 3.x messing up the quoting of the code.
Don't know what they did to introduce all those bugs, but anyway,
Thunderbird 3.x is an example that even seasoned programmers introduce
an unbelievable number of bugs, I think mostly just by repeating code
patterns blindly.
In your code above you're doing as the TB programmers presumably did,
repeating a code pattern that you've seen has worked, without fully
grokking it. The call to 'mainloop' enters a loop. A button press causes
your callback to be invoked from within that loop, but your code then
enters a new 'mainloop'.
Don't.
Except for modal dialogs the single top level 'mainloop' suffices (all
it does is to dispatch "messages" to "handlers", such as your button
press callback). So, just place a single call to 'mainloop' at the end
of your program. Remove the calls in 'First' and 'Second'.
How do I create custom modal dialogs then?
I typed
tkinter modal dialog
in the Firefox address bar, and it landed me on
http://effbot.org/tkinterbook/tkinter-dialog-windows.htm
Cheers & hth.,
- Alf
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blog at <url: http://alfps.wordpress.com>
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