Python 3.x Tkinter在初始化后更改跟踪OptionMenu的StringVar
如果可能的话,我不知道如何将不同的StringVar分配给已经存在的OptionMenu 例如:Python 3.x Tkinter在初始化后更改跟踪OptionMenu的StringVar,python-3.x,tkinter,optionmenu,Python 3.x,Tkinter,Optionmenu,如果可能的话,我不知道如何将不同的StringVar分配给已经存在的OptionMenu 例如: def optionMenuChanged(*args): print(args[0]) # prints var1 if assigned to foo, prints var2 if assigned to bar foo = tk.StringVar(name = 'var1') foo.trace('w', optionMenuChanged) bar = tk.StringVar(
def optionMenuChanged(*args):
print(args[0]) # prints var1 if assigned to foo, prints var2 if assigned to bar
foo = tk.StringVar(name = 'var1')
foo.trace('w', optionMenuChanged)
bar = tk.StringVar(name = 'var2')
bar.trace('w', optionMenuChanged)
choices = ['1', '2', '3']
menu = OptionMenu(frame, foo, *choices)
'''
do stuff with menu
'''
menu.SetVariable(bar) # SetVariable does not exist
'''
do other stuff with menu
'''
这可能吗?是的,可能会,但很棘手
- 首先定义一个函数,如下所示:
def set_var(optmenu, var, callback=None): menu = optmenu['menu'] last = menu.index('end') for i in range(last+1): label = menu.entrycget(i, 'label') menu.entryconfig(i, command=tk._setit(var, label, callback)) optmenu.config(textvariable=var)
- 然后,只要您想更改变量,就调用它:
set_var(menu, bar)