Tkinter Menubutton 小部件键绑定以在同一窗口中打开菜单小部件元素 [英] Tkinter Menubutton widget key binding to open Menu widget elements in same window

问题描述

我使用 Menubutton 和 Menu 小部件在菜单内创建了一个子菜单:

I have created a submenu inside a menu using Menubutton and Menu widgets:

from tkinter import *
root = Tk()

def f(event):
    submenu.invoke(0)

mainmenu = Menubutton(root, text="Menu")
mainmenu.pack()

submenu = Menu(mainmenu)
mainmenu.config(menu=submenu)

submenu.add_command(label="Option 1")
submenu.add_command(label="Option 2")

现在我想给我的菜单添加一个键绑定:

Now I want to add a key binding to my menu:

mainmenu.bind("<Key>", f)
mainmenu.focus_set()

它很有魅力:当我按下一个键时，它会打开子菜单.但问题是，子菜单是作为一个被撕掉的顶层窗口打开的.但我希望它与菜单在同一个窗口中打开.我将 tearoff=0 添加到 submenu (所以它变成了这样:submenu = Menu(mainmenu, tearoff=0)).但是现在，它不返回任何东西.我试图弄清楚为什么它没有.也许我做错了什么...
我一直在寻找解决方案，但没有一个能解决问题.他们所说的只是添加一个打印出一些东西的键绑定，但是我想要一个键绑定有点自动点击菜单项，它弹出项目元素，但不是作为一个单独的窗口(也许它被称为 上下文菜单?).我在任何地方都找不到针对此特定问题的任何解决方案.
那么我怎样才能让它发生呢?任何帮助将不胜感激.

It works as charm: when I press a key, it opens up the submenu. But the problem is, the submenu is opened as a torn off toplevel window. But I want it to be opened in same window with menu. I added tearoff=0 into submenu (so it became like this:submenu = Menu(mainmenu, tearoff=0)). But now, it does not return anything. I'm trying to figure out why it doesn't. Maybe I'm doing something wrong...
I have looked for a solution, but none of them solves the problem. All they tell is just adding a key binding that prints out something, however I want a key binding that kinda automatically clicks on a menu item, and it pops up the item elements, but not as a separate window (maybe it's called contextmenu?). I couldn't find any solution to this specific problem anywhere.
So how can I make it happen? Any help would be appreciated.

推荐答案

我认为

def f(event):
    submenu.post(mainmenu.winfo_rootx(), 
                 mainmenu.winfo_rooty() + mainmenu.winfo_height())

做你想做的事，即使有 tearoff=False 选项.

does what you want, even with the tearoff=False option.

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