CODEWITHSUNDEEP
pythontkintertimercountdown
Dwi Heryanto
Dwi Heryanto

Reputation: 1

Python how to make repeat timer GUI

I am learning Python and still in level beginner. I try to make timer program which the timer will be repeated continuously after certain of time.

I write as follow:

from tkinter import *
import threading
import time

mgui = Tk()


def refresh():
    
    threading.Timer(20, refresh).start()
        
    detik = 19
    while detik >= 0:
        menit,detik = divmod (detik,60)
        timer ='{:02d}:{:02d}'.format(menit, detik)
        time.sleep(1)
        detik -= 1
        
        refresh_waktu=Entry(mgui, width= 6, font=("Helvetica bold", 40), fg='red', bd=2)
        refresh_waktu.place(x=155, y=152)
        refresh_waktu.insert(END, str(f"{timer:>6}"))

refresh()

mgui.geometry('450x450')
mgui.title('Test')

mgui.mainloop()

When I run the program, the interface GUI seem delay about 20 seconds although after that the program timer running as my expected.

I try to make the Interface also appear when start the program, but I still fail to do so.

Please if anyone can help me to give some advice or suggestion.

I sincerely thank for your help.

Best regards

Upvotes: 0

Views: 309

Answers (1)

Tim Roberts
Tim Roberts

Reputation: 54897

Tk, like all GUI systems, is event driven. When you create or modify a window, nothing visible happens. All that does is send messages. It is the job of the main loop to extract and dispatch those messages, and that's where the drawing is done. In your case, you are blocking for 20 seconds before you enter the main loop, so nothing will be drawn until then. You need to use something like mgui.after to request a callback after a second, and use that for your timing.

Upvotes: 1

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