Python 2.7.x Tkinter弹出菜单抛出tclError

Question

I'm trying to create a popup menu in Tk, but when I get to the part where the menu is to be displayed (menu.post), I get a "TclError" exception. I don't understand why, and when I try to step into the Tk code to see what's going wrong, I only get a couple of steps in before I suddenly can't step into code anymore and the exception bubbles up. Can someone tell me what I'm doing wrong? I think it has to do with how I'm creating the menu.

class Bugger(tk.Tk):
    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)

        # setup window attributes
        self.overrideredirect(True)
        self.attributes('-topmost', 1)

        # set starting positions and values
        self.TotalAssigned = "0"
        self.TotalResolved = "0"

        # add first label
        self.label1 = tk.Label(self, text=self.TotalAssigned, bg="red")
        self.label1.pack(side="left", fill="both", expand=True)

        # add second label
        self.label2 = tk.Label(self, text=self.TotalResolved, bg="yellow")
        self.label2.pack(side="right", fill="both", expand=True)

        # add right-click menu
        self.menu = tk.Menu(master=self, tearoff=0)
        self.menu.add_command(label="Exit", command=self.ExitMenu)
        self.menu.add_command(label="Preferences", command=self.Preferences)
        self.bind("<ButtonRelease-2>", self.popup)

    def ExitMenu(self):
        exit(0)

    def popup(self, event):
        self.menu.post(event.x_root,event.y_root)

    def Preferences(self):
        print ("In preferences dialog")


if __name__ == "__main__":

    bugger = Bugger()
    bugger.mainloop()

The TclError exception takes place on the line self.menu.post(event.x_root,event.y_root)

Edit: Here's the error I'm getting. I don't know why I didn't include this the first time.

Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/local/Cellar/python/2.7.10_2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 1536, in __call__
    return self.func(*args)
  File "/Users/robb/source/Bugger.py", line 73, in popup
    self.menu.post(event.x_root,event.y_root)
  File "/usr/local/Cellar/python/2.7.10_2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 2797, in post
    self.tk.call(self._w, 'post', x, y)

TclError

Any advice for me?

Answer 1

Ok. I think that you have to assign the menu to the root window. To do this add the line self.config(menu=self.menu) . Other wise you are calling the menu without it having a window to display on.

Edit

Also it can't be set to overrideredirect because it does not support popup menus. It also gives an error if you right click on the window when it is not in focus.

Hope this helps!