here is a solution :
from Tkinter import *
root = Tk()
def callback():
print 'clicked on cross'
class App:
def __init__(self, master):
c = Button(master, text="Only one")
c.bind("<Button-1>", lambda e, s=self:s.cb(master))
c.pack()
def cb(self,master):#, event):
win = Toplevel(master)
win.protocol('WM_DELETE_WINDOW',callback)
win.title("one")
frame= Frame(win)
b=Button(frame, text='ok', command=win.quit)
b.pack()
frame.pack()
app=App(root)
root.mainloop()
Olivier
V H wrote:
>Hi all,
>
>I use a button to generate a toplevel window. I hope only one such window
>is existing before I close it manually. But now each time when I click the
>button a new window is created. How can I do?
>
>How do I bind a function to the close of the window by clicking the cross in
>the up-right side?
>
>Following is a example program. You solution or suggetstiong is very
>appreciated .
>
>regards,
>Vning
>
>
>
>from Tkinter import *
>root = Tk()
>class App:
> def __init__(self, master):
> c = Button(master, text="Only one")
> c.bind("<Button-1>", lambda e, s=self:s.cb(master))
> c.pack()
> def cb(self,master):#, event):
> win = Toplevel(master)
> win.title("one")
> frame= Frame(win)
> b=Button(frame, text='ok', command=win.quit)
> b.pack()
> frame.pack()
>app=App(root)
>root.mainloop()
>
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