如何在无需单击按钮的情况下获取 Tkinter 比例尺的值？

Question

如何在无需单击按钮的情况下获取 Tkinter 比例的值？我下面的代码工作正常...但我需要一种方法来获取值，而无需单击移动 Tkinter 比例尺时自动更改值的按钮。from tkinter import *def sel():   selection = "Value = " + str(var.get())   label.config(text = selection)root = Tk()var = DoubleVar()scale = Scale( root, variable = var )scale.pack(anchor=CENTER)button = Button(root, text="Get Scale Value", command=sel)button.pack(anchor=CENTER)label = Label(root)label.pack()root.mainloop()

Answer 1

command您可以在对象中使用该选项Scale：

from tkinter import *

def sel(val=0):  # pass new scale value

   #selection = "Value = " + str(var.get())

   #label.config(text = selection)

   label.config(text = val)

root = Tk()

var = DoubleVar()

scale = Scale( root, variable = var, command=sel)  # call sel function on change

scale.pack(anchor=CENTER)

button = Button(root, text="Get Scale Value", command=sel)

button.pack(anchor=CENTER)

label = Label(root)

label.pack()

root.mainloop()

Answer 2

使用文本变量代替文本参数：

from tkinter import *

root = Tk()

var = DoubleVar()

scale = Scale( root, variable = var )

scale.pack(anchor=CENTER)

label = Label(root, textvariable=var)

label.pack()

root.mainloop()