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I want to make three scale slider in tkinter in Python, where I can move the slider of first two and the third slider moves itself as the sum of the values of first two sliders

I tried with the following code where I try to set the value of first two to the third.

from tkinter import *
master = Tk()
#First Scale
w1=Scale(master, from_=0, to=100,orient=HORIZONTAL) 
w1.pack() 
#Second Scale
w2=Scale(master, from_=0, to=200,orient=HORIZONTAL) 
w2.pack() 

#Third Scale where sum has to be shown
w3=Scale(master, from_=0, to=300,orient=HORIZONTAL) 
w3.set(w1.get()+w2.get())
w3.pack() 
mainloop()

The expectation is to move the first two sliders and the third slider moves itself to the value which is sum of the values of first two sliders.

wallisers
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Ravi Ranjan Prasad Karn
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1 Answers1

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You can create two IntVar as variables for your first two Scale, then trace the changes and set the third Scale.

from tkinter import *
master = Tk()
#First Scale
w1_var = IntVar()
w1=Scale(master, from_=0, to=100, variable=w1_var, orient=HORIZONTAL)
w1.pack()
#Second Scale
w2_var = IntVar()
w2=Scale(master, from_=0, to=200, variable=w2_var, orient=HORIZONTAL)
w2.pack()   

#Third Scale where sum has to be shown
w3=Scale(master, from_=0, to=300,orient=HORIZONTAL,state="disabled")
w3.pack()

def trace_method(*args):
    w3.config(state="normal")
    w3.set(w1.get() + w2.get())
    w3.config(state="disabled")

w1_var.trace("w", trace_method)
w2_var.trace("w", trace_method)

master.mainloop()
Henry Yik
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  • One more thing, Can we make the third scale only move when first two scales move. Third scale should not be moved manually. – Ravi Ranjan Prasad Karn Sep 10 '19 at 12:42
  • Of course - but you will need to make a function to enable/disable it. – Henry Yik Sep 10 '19 at 12:45
  • Its done.`from tkinter import * master = Tk() w1_var = IntVar() w2_var = IntVar() w3_var = IntVar() w1=Scale(master, from_=0, to=100, variable=w1_var, orient=HORIZONTAL) w1.pack() w2=Scale(master, from_=0, to=200, variable=w2_var, orient=HORIZONTAL) w2.pack() #Third Scale where sum has to be shown w3=Scale(master, from_=0, to=300,variable=w3_var,orient=HORIZONTAL) w1_var.trace("w",lambda *args:w3.set(w1.get()+w2.get())) w2_var.trace("w",lambda *args:w3.set(w1.get()+w2.get())) w3_var.trace("w",lambda *args:w3.set(w1.get()+w2.get())) w3.pack() mainloop() ` – Ravi Ranjan Prasad Karn Sep 10 '19 at 12:52