Hello,
I've recently stumbled on a problem while working with the Menu object
on both Linux and Windows.
I'm trying to create a loosely-coupled menu object, so rather than
calling commands directly I'm generating custom events. The main
application object then binds callback methods to those custom events.
This example shows the basic approach:
**** EXAMPLE FOLLOWS ****
import tkinter as tk
root = tk.Tk()
root.geometry('300x200')
label = tk.Label(text='Test')
label.grid()
menu = tk.Menu(root)
root.configure(menu=menu)
submenu = tk.Menu(menu)
menu.add_cascade(menu=submenu, label='Change Text')
submenu.add_command(
label='Foo',
command=lambda: menu.event_generate('<<Foo>>')
)
submenu.add_command(
label='Bar',
command=lambda: menu.event_generate('<<Bar>>')
)
def setfoo(*_):
label.configure(text='Foo')
def setbar(*_):
label.configure(text='Bar')
menu.bind('<<Foo>>', setfoo)
menu.bind('<<Bar>>', setbar)
print(menu.bind())
root.mainloop()
**** END EXAMPLE ****
This code works as expected on Linux, but does not work at all on
Windows. The callback are never executed. I suspect this has to do
with the way menus are implemented on Windows; I know I can
generate/bind events on the root window as a workaround, but should this
work as-is?
( PS -- I posted this to stackoverflow, if anyone is interested in
replying there: https://stackoverflow.com/q/67289539/1454109 )
Regards,
Alan Moore
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