I understand that you don't need a variable to be specified for a scale like such:
scale = tk.Scale(root, from_ = 1, to = 100) # makes scale without variable
scaleValue = scale.get() # sets value to scale
I, however, need a way to have a variable set in real time and every time the scale value is changed. Is there a way to make that work without constantly resetting scaleValue to scale.get()?
By making a tkinter variable using variable = tk.DoubleVar(), it will automatically update variable when a change has happened.
scaleVar = tk.DoubleVar
scale = tk.Scale(
root,
from_ = 1,
to = 100,
variable = scaleVar # makes scale with updating variable
)
If you use something like an IntVar() to track the value you can see that it is auto updated with a function that will check the current value.
If you want the value to be displayed and returned as a float you can use DoubleVar() and then also set resolution=0.01 as an argument in the Scale widget.
import tkinter as tk
class Example(tk.Tk):
def __init__(self):
super().__init__()
self.int_var = tk.IntVar()
self.scale = tk.Scale(self, from_=1, to=100, variable=self.int_var)
self.scale.pack()
tk.Button(self, text="Check Scale", command=self.check_scale).pack()
def check_scale(self):
print(self.int_var.get())
if __name__ == "__main__":
Example().mainloop()
Results:
For an example using the DoubleVar() you can do this:
import tkinter as tk
class Example(tk.Tk):
def __init__(self):
super().__init__()
self.dou_var = tk.DoubleVar()
self.scale = tk.Scale(self, from_=1, to=100, resolution=0.01, variable=self.dou_var)
self.scale.pack()
tk.Button(self, text="Check Scale", command=self.check_scale).pack()
def check_scale(self):
print(self.dou_var.get())
if __name__ == "__main__":
Example().mainloop()
Results:
