如何使用 Tkinter 传递多个命令？

Question

例如我有

root = Tk()
root.geometry("650x500+0+0")
def do_it():
    print("1st function")
def do_it1():
    print("2nd function")
button = Button(root,text="Change Config", width=20, height=3, bg="#26d142",fg="#030208", command=do_it)

但我希望它通过 2 个命令 就像

button = Button(root,text="Change Config", width=20, height=3, bg="#26d142",fg="#030208", command=do_it, do_it1)

Answer 1

最简单的方法是创建一个新的函数来运行这两个函数并将其与 Button 一起使用

def do_it():
    print("1st function")
def do_it1():
    print("2nd function")

def new_function():
    do_it()
    do_it1()

button = Button(root,text="Change Config", command=new_function)

---

正如@acw1668 在评论中显示的那样，您可以使用lambda 将其写得更短

button = tk.Button(root,text="Change Config", command=lambda:(do_it(), do_it1()))

但有时它的可读性可能会降低。

---

编辑：

使用bind(..., add="+")，您还可以为同一个小部件和事件分配许多功能。对bind 和unbind 功能之一可能有用，但我不知道您是否可以保持功能顺序。

它需要在函数中获取参数（event）。它需要定义自己的unbind()，因为原来的unbind() 不能按预期工作，它会删除所有功能，而只选择一个。

我从Deleting and changing a tkinter event binding 得到了unbid()

import tkinter as tk

# --- functions ---

def unbind(widget, sequence, funcid=None):
    """Unbind for this widget for event SEQUENCE the function identified with FUNCID."""

    # remove all functions
    if not funcid:
        widget.tk.call('bind', widget._w, sequence, '')
        return
    
    # get list with all functions
    func_callbacks = widget.tk.call('bind', widget._w, sequence, None).split('\n')
    # remove one function from list
    new_callbacks = [l for l in func_callbacks if l[6:6 + len(funcid)] != funcid]
    # bind again other functions
    widget.tk.call('bind', widget._w, sequence, '\n'.join(new_callbacks))
    # clear
    widget.deletecommand(funcid)

def do_it(event=None):
    print("1st function")
    unbind(button, '<Button 1>', bind_id1)
    
def do_it1(event=None):
    print("2nd function")

def new_function():
    do_it()
    do_it1()

# --- main ---

root = tk.Tk()

button = tk.Button(root,text="Button 1", command=new_function)
button.pack()

button = tk.Button(root,text="Button 2", command=lambda:(do_it(), do_it1()))
button.pack()

button = tk.Button(root,text="Button 3")
button.pack()

bind_id1 = button.bind('<Button 1>', do_it, add="+")
bind_id2 = button.bind('<Button 1>', do_it1, add="+")
print(bind_id1)

root.mainloop()