Python Tkinter菜单栏未显示

Question

我有以下未显示菜单的代码。一直有效，直到我将菜单移到全班为止。我基于this question添加了self.configure(menu=self.menu)，但仍然无法正常工作。打印语句显示菜单构建代码正在运行。

我可以正确引用父母吗？

如果我错误地从父级而不是从控制器引用了事件处理程序，则错误表明这是一个Tk（）对象。

我在Ubuntu上使用python3.6和tkinter8.6。

import tkinter as tk
class App(tk.Tk):
    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)
        self.main = MainWindow(self)
        self.menu=MainMenu(self, self.main)
        self.configure(menu=self.menu)
        self.minsize(300,300)
        self.geometry("500x500")
        self.protocol('WM_DELETE_WINDOW', self.main.on_exit)
        self.main.pack(fill="both", expand=True)

class MainWindow(tk.Frame):
    def __init__(self, parent, *args, **kwargs):
        tk.Frame.__init__(self, parent, *args, **kwargs)
        self.parent = parent
    def on_exit(self):
        print("exiting...")
        self.parent.destroy()
    def on_choose_port(self):
        print("on_choose_port selected")

class MainMenu(tk.Menu):
    def __init__(self, parent, controller):
        tk.Menu.__init__(self, master=None)
        self.master = parent
        self.controller = controller
        print("building menu bar")
        self.menubar = tk.Menu(self.master)
        self.menubar.add_cascade(label="File", menu=self.file_menu(self.menubar))
        self.menubar.add_cascade(label="Settings", menu=self.settings_menu(self.menubar))

    def file_menu(self, parent):
        print("building file menu...")
        file_menu = tk.Menu(parent)
        file_menu.add_command(label="Exit", command=self.controller.on_exit)
        return file_menu

    def settings_menu(self, parent):
        print("building settings menu...")
        settings_menu = tk.Menu(parent)
        settings_menu.add_command(label="Port", command=self.controller.on_choose_port)
        return settings_menu

if __name__ == "__main__":
    App().mainloop()

Answer 1

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换句话说，您需要将级联菜单添加到self.menubar而不是添加到self，并且根本不需要创建self.menubar。

self.menubar