March 2003
Intermediate to advanced
656 pages
39h 30m
English
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Menus
Class Menu implements
all kinds of menus: menubars of top-level windows, submenus, and
pop-up menus. To use a Menu instance
m as the menubar for a top-level window
w, set
w’s configuration option
menu=
m. To use
m as a submenu of a
Menu instance x, call
x
.add_cascade with a
named argument menu=
m.
To use m as a pop-up menu, call method
m
.post.
Besides configuration options covered in Section 16.2.1 earlier in this chapter, a
Menu instance m
supports option
postcommand=
callable.
Tkinter calls callable
without arguments each time it is about to display
m (whether because of a call to
m
.post or because of
user actions). You can use this option to update a dynamic menu just
in time when necessary.
By default, a Tkinter menu shows a tear-off entry
(a dashed line before other entries), which lets the user get a copy
of the menu in a separate Toplevel window. Since
such tear-offs are not part of user interface standards on popular
platforms, you may want to disable tear-off functionality by using
configuration option tearoff=0 for the menu.
Menu-Specific Methods
Besides methods common to all widgets, an instance
m of class Menu
supplies several menu-specific methods.
Menu Entries
When
a menu m displays, it shows a vertical
(horizontal for a menubar) list of entries. Each entry can be one of
the following kinds:
-
cascade A submenu; option
menu=xmust give asxanotherMenuinstance-
checkbutton Similar to a
Checkbuttonwidget; typical options arevariable(which must indicate a ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.