是的,这是可能的。用StringVar.trace
你可以检查第一个选项何时被更改。然后删除第二个OptionMenu的所有选项,并用相应的选项填充它。如果你有一个像这背后的字典的数据结构,它可以很容易的对应地图:
import sys
if sys.version_info[0] >= 3:
import tkinter as tk
else:
import Tkinter as tk
class App(tk.Frame):
def __init__(self, master):
tk.Frame.__init__(self, master)
self.dict = {'Asia': ['Japan', 'China', 'Malaysia'],
'Europe': ['Germany', 'France', 'Switzerland']}
self.variable_a = tk.StringVar(self)
self.variable_b = tk.StringVar(self)
self.variable_a.trace('w', self.update_options)
self.optionmenu_a = tk.OptionMenu(self, self.variable_a, *self.dict.keys())
self.optionmenu_b = tk.OptionMenu(self, self.variable_b, '')
self.variable_a.set('Asia')
self.optionmenu_a.pack()
self.optionmenu_b.pack()
self.pack()
def update_options(self, *args):
countries = self.dict[self.variable_a.get()]
self.variable_b.set(countries[0])
menu = self.optionmenu_b['menu']
menu.delete(0, 'end')
for country in countries:
menu.add_command(label=country, command=lambda nation=country: self.variable_b.set(nation))
if __name__ == "__main__":
root = tk.Tk()
app = App(root)
app.mainloop()
请问“self.variable_a.set(‘亚洲’)”命令自动触发updateoptions()这样的自.optionmenu_b已设置? – Tango