How can I have a ttk.progressbar call a function when it is completed (Python)?

Question

I am trying to have a ttk progressbar call a function that adds to a value that is displayed in the Tkinter window. I currently have a function that is called at the same time the progressbar begins:

def bar1_addVal():
     global userMoney
     userMoney += progBar1_values.value
     moneyLabel["text"] = ('$' + str(userMoney))
     canvas1.after((progBar1_values.duration*100), bar1_addVal)
     return

but I cannot seem to get the exact amount of time it takes for the progressbar to finish each iteration. Is there a way to have the progressbar call a function every time it completes?

Answer 1

You can use threading to check for the variable in a loop. Then you wont interrupt the main loop.
I made a little example of this:

import threading, time
from ttk import Progressbar, Frame
from Tkinter import IntVar, Tk


root = Tk()


class Progress:

    val = IntVar()
    ft = Frame()
    ft.pack(expand=True)
    kill_threads = False  # variable to see if threads should be killed

    def __init__(self):
        self.pb = Progressbar(self.ft, orient="horizontal", mode="determinate", variable=self.val)
        self.pb.pack(expand=True)
        self.pb.start(50)

        threading.Thread(target=self.check_progress).start()


    def check_progress(self):
        while True:
            if self.kill_threads:  # if window is closed
                return             # return out of thread
            val = self.val.get()
            print(val)
            if val > 97:
                self.finish()
                return
            time.sleep(0.1)

    def finish(self):
        self.ft.pack_forget()
        print("Finish!")


progressbar = Progress()


def on_closing():       # function run when closing
    progressbar.kill_threads = True  # set the kill_thread attribute to tru
    time.sleep(0.1)  # wait to make sure that the loop reached the if statement
    root.destroy()   # then destroy the window

root.protocol("WM_DELETE_WINDOW", on_closing) # bind a function to close button

root.mainloop()

Edit: Updated the answer, to end the thread before closing window.