tkinter add_checkbutton menu not getting a checkmark, though variable is there (MacOS)

Question

I have a menu:

class NodePopup(tk.Menu):
    def __init__(self, master):
        super().__init__(master, tearoff=0)
        self.send_disabled = tk.BooleanVar()
        self.add_checkbutton(label="Disable sending", 
            command=self.toggle_send, variable=self.send_disabled)

    def popup(self, node, event):
        self.send_disabled.set(node.some_flag)
        print('send_disabled:', self.send_disabled.get())
        self.post(event.x_root, event.y_root)


class View:
    def __init__(self, master)
        self.master = master
        self.canvas = #...
        # ...
        self.node_popup = NodePopup(self.master)
        self.canvas.bind("<Button-2>", self.popup)

    def popup(self, event):
        node_oval, node = self.find_node(event.x, event.y)
        self.node_popup.popup(node, event)

When calling my_menu.popup(e), it always pops up without a checkmark. print() prints the right values though.

OS X 10.12, python 3.6.0b4.

What is the problem?

you run self.node_popup.popup(event, node) with two arguments but def popup(self, event): expects only one. And what do you do in self.toggle_send ? — furas
– furas, Commented Dec 14, 2016 at 0:10
The code works for me when I fix all the mistakes, add the missing code, and set self.send_disabled to True or False. — Bryan Oakley
– Bryan Oakley, Commented Dec 14, 2016 at 0:14
I test on this example and it works for me (Linux Mint). Maybe it problem with OSX. — furas
– furas, Commented Dec 14, 2016 at 0:15
Thanks @furas! That is one last step I should have make (if I had Linux at hand). I ran the example, and there's no tick on the menu either. Clearly, the answer is that it's a OS X port bug. I'll go see where to report it. — Victor Sergienko
– Victor Sergienko, Commented Dec 14, 2016 at 1:37

Victor Sergienko · Accepted Answer · 2016-12-14 17:33:47Z

2

As this code is reported to work on Linux, I reported a bug: http://bugs.python.org/issue28966, which in turn was closed.

Due to a known problem, Python for OS X comes without a built-in Tk, and uses outdated Tk distribution from Apple. One needs to install an ActiveTcl.

As a workaround, I changed the text the way it's clear that the meaning of menu item changed:

self.entryconfig(
    0, label='Enable sending' if node.m_bSendOff else 'Disable sending')

edited Dec 14, 2016 at 17:33

answered Dec 14, 2016 at 1:47

Victor Sergienko

13.7k3 gold badges63 silver badges99 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

furas Over a year ago

you can remove def change() in reported code - it was used only by Button() to change checkbutton.

jasonharper · Accepted Answer · 2016-12-14 00:24:32Z

1

If you look at any working example of Menu.add_checkbutton, you'll see that it is using an IntVar, not a BooleanVar. The state of a Tk checkbutton is, in fact, not a boolean: it takes on the values specified by the offvalue and onvalueoptions, which are 0 and 1 by default but could be set to any value.

answered Dec 14, 2016 at 0:24

jasonharper

9,6292 gold badges21 silver badges46 bronze badges

2 Comments

furas Over a year ago

offvalue/onvalue can be True/False or any strings too. Try offvalue="Hello", onvalue="World" and StringVar().

Victor Sergienko Over a year ago

Tried it and it didn't work either. Maybe it's a bug in particular tkinter version.

Collectives™ on Stack Overflow

tkinter add_checkbutton menu not getting a checkmark, though variable is there (MacOS)

2 Answers 2

1 Comment

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related