python - TkInter, slider: how to trigger the event only when the iteraction is complete?

Question

I'm using the slider to update my visualization, but the command updateValue is sent everytime I move the slider thumb, even for intermediate values.

Instead I want to trigger it only when I release the mouse button and the interaction is complete.

self.slider = tk.Scale(self.leftFrame, from_=0, to=256, orient=tk.HORIZONTAL, command=updateValue)

How can I trigger the function only once, when the interaction is ended ?

Answer 1

This is quite an ancient question now, but in case anyone stumbles upon this particular problem just use the bind() function and the "ButtonRelease-1" event like so:

import Tkinter as tk

class App:
    def __init__(self):
        self.root = tk.Tk()

        self.slider = tk.Scale(self.root, from_=0, to=256, 
                               orient="horizontal")
        self.slider.bind("<ButtonRelease-1>", self.updateValue)
        self.slider.pack()
        self.root.mainloop()

    def updateValue(self, event):
        print self.slider.get()

app=App()

Hope this helps anyone!