In some dialogs I wanted to restore the size from the last time it was opened
therefore, before calling the wait_window I have
self.wait_visibility()
self.geometry(...restore...) #<<< the geometry setting will not work if it is not visible
self.wait_window()
If something happens during the filling of the dialog information I show a messagebox.
The messagebox is triggering the event loop, which displays also the dialog
If the dialog is displayed then the execution gets stuck in the "wait_visibility",
and when the user closes the dialog, the execution proceeds to the wait_window
which causes an exception since the window do not longer exits.
I think it is a tk bug, that the wait_visibility waits despite the window is visible.
The only way to cure it is to add a check "if self.winfo_ismapped()"
Example:
import tkinter as tk
import tkinter.messagebox as messagebox
error = True
class Dialog(tk.Toplevel):
width = 320
height = 240
def __init__(self, master, *args):
super().__init__(master, *args)
self.transient(master)
self.b = tk.Button(self, text="Close", command=self.close)
self.b.pack()
if error:
messagebox.showerror("Error",
"Something happened",
parent=self)
#if not self.winfo_ismapped(): self.wait_visibility()
self.wait_visibility()
if Dialog.width>0:
self.geometry(f"{Dialog.width}x{Dialog.height}")
self.wait_window()
def close(self):
# save size... and destroy...
self.destroy()
root = tk.Tk()
dlg = Dialog(root)
