Tkinter - 如何在菜单栏中创建子菜单

问题描述：

有可能吗?通过查看选项，我很难过.在网上搜索并没有带我去任何地方.我可以在菜单栏中创建子菜单吗?我指的是当我单击文件"并转到最近的文件"时执行类似于 Idle Shell 的操作，它会拉出一个单独的文件，显示我最近打开的文件.

Is it possible? By looking at the options I'm stumped. Searching on the web hasn't lead me anywhere. Can I create a submenu in the menubar. I'm referring to doing something similar to Idle Shell when I click on File and go down to Recent Files and it pulls up a separate file showing the recent files I've opened.

如果不可能，我必须用什么来让它工作?

If it's not possible what do I have to use to get it to work?

答

使用 add_cascade 完全按照向菜单栏添加菜单的方式进行操作.举个例子:

You do it exactly the way you add a menu to the menubar, with add_cascade. Here's an example:

# Try to import Python 2 name
try:
    import Tkinter as tk
# Fall back to Python 3 if import fails
except ImportError:
    import tkinter as tk

class Example(tk.Frame):
    def __init__(self, root):
        tk.Frame.__init__(self, root)
        menubar = tk.Menu(self)
        fileMenu = tk.Menu(self)
        recentMenu = tk.Menu(self)

        menubar.add_cascade(label="File", menu=fileMenu)
        fileMenu.add_cascade(label="Open Recent", menu=recentMenu)
        for name in ("file1.txt", "file2.txt", "file3.txt"):
            recentMenu.add_command(label=name)


        root.configure(menu=menubar)
        root.geometry("200x200")

if __name__ == "__main__":
    root = tk.Tk()
    Example(root).pack(fill="both", expand=True)
    root.mainloop()

Tkinter - 如何在菜单栏中创建子菜单

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