tkinter wm_delete_window

[Eric Brunel]

On Tue, 18 Jul 2006 11:16:04 +0200, yvesd <yves.delalande at gmail.com> wrote:
> hello i want to intercept tkinter python system events like
> wm_delete_window
> and if possible for any window, but the newest code I've produced give
> me
> an error :
> Traceback (most recent call last):
>   File "C:\Documents and Settings\yvesd\Bureau\protowin.py", line 36,
> in ?
>     b1 = Tkinter.Button (win1)
>   File "C:\Python24\lib\lib-tk\Tkinter.py", line 1933, in __init__
>     Widget.__init__(self, master, 'button', cnf, kw)
>   File "C:\Python24\lib\lib-tk\Tkinter.py", line 1856, in __init__
>     BaseWidget._setup(self, master, cnf)
>   File "C:\Python24\lib\lib-tk\Tkinter.py", line 1834, in _setup
>     self.tk = master.tk
> AttributeError: MyDlg instance has no attribute 'tk'
> thanks a lot for the help answer.
> here is my code :
> import Tkinter
> from Tkinter import *

Do not import the same module twice: either use "import Tkinter" and  
prefix everything in it with 'Tkinter.', or use "from Tkinter import *"  
and don't specify any prefix. You're mixing both here.

> class MyDlg(Toplevel):
> 	def ma_fonction():

You must specify 'self' as first parameter here. Or put 'ma_fonction'  
outside the class.

> 		print "my function is finished."
> 	def __init__(arg1, arg2):
> 		arg1.protocol("WM_DELETE_WINDOW", arg1.ma_fonction)

Please don't use anything else than 'self' as the name for methods' first  
parameter. It will confuse everyone who knows Python. And your mistake is  
here: the constructor for the super-class (Toplevel) is not called  
automatically by the sub-class constructor; so you have to do it yourself.  
So just rewrite these two lines as:

def __init__(self):
   Toplevel.__init__(self)
   self.protocol("WM_DELETE_WINDOW", self.ma_fonction)

and everything should work fine. BTW, I've removed the parameter arg2 that  
you didn't use at all.

> root = Tkinter.Tk ()
> #win1 = Tkinter.Toplevel (root)
> win1 = MyDlg(root)

Replace that with:

win1 = MyDlg()

> b1 = Tkinter.Button (win1)
> b1.config (text="hello")

An additional small note: you can write the last two lines as a single one:

b1 = Tkinter.Button(win1, text='hello')

And you also must call:
- b1.pack, b1.grid or b1.place to put your button somewhere in your window.
- root.mainloop() in the end or your window will never appear.

If you want to do Tkinter the OO way, you may also create the button in  
the dialog's constructor.

So here would be my version of your program:

----------------------------------------------
 from Tkinter import *

class MyDlg(Toplevel):
   def __init__(self):
     Toplevel.__init__(self)
     b1 = Button(self, text='hello')
     b1.pack()
     self.protocol("WM_DELETE_WINDOW", self.ma_fonction)
   def ma_fonction(self):
     print "my function is finished."

root = Tk()
win1 = MyDlg()
root.mainloop()
----------------------------------------------

HTH
-- 
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