Progressbar with start and stop

[jelo34]

Hello,I a Python beginner and am unable to code a scrpit coding for for a window with a start button and a stop button able to start an stop a progressbar in tkinter. My script start the proression but cannot stop it.
Thanks for your help!!

import tkinter as tk
from tkinter import *


def create_window():
    from tkinter import ttk
    import time
    
    def start():
        for x in range (5):
            myprogress['value']+=20
            root.update_idletasks()
            time.sleep(1)
            print(myprogress['value'])


    def stop():
        myprogress.stop()
    
    root= Tk()
    root.geometry("660x400")
    myprogress=ttk.Progressbar(root, orient=HORIZONTAL, length=300, mode='indeterminate')
    myprogress.pack(pady=20)
    mybutton=Button(root, text="start", command=start)
    mybutton.pack(pady=20)
    mybuttonstop=Button(root, text="stop", command=stop)
    mybuttonstop.pack(pady=20)
    root.mainloop()

root = tk.Tk() 
b = tk.Button(root, text="Create new window", command=create_window)
b.grid(row=4, column=3, sticky=W+E, padx=10, pady=20)
 
root.mainloop() 
    

[deanhystad]

You don't want to use a loop and wait. That blocks the GUI from responding to things like typing or mouse clicks. You need to generate periodic events that call a function to update the progress bar. Read about tkinter.after.

[joe_momma]

in your script you use stop() but you didn't use start

import tkinter as tk
from tkinter import *
 
 
def create_window():
    from tkinter import ttk
    import time
     
    def start():
        myprogress.start()
        
 
    def stop():
        myprogress.stop()
     
    root= Tk()
    root.geometry("660x400")
    myprogress=ttk.Progressbar(root, orient=HORIZONTAL, length=300, mode='indeterminate',
                               maximum=100)
    myprogress.pack(pady=20)
    
    mybutton=Button(root, text="start", command=start)
    mybutton.pack(pady=20)
    mybuttonstop=Button(root, text="stop", command=stop)
    mybuttonstop.pack(pady=20)
    root.mainloop()
 
root = tk.Tk() 
b = tk.Button(root, text="Create new window", command=create_window)
b.grid(row=4, column=3, sticky=W+E, padx=10, pady=20)
  
root.mainloop()

example of after and after_cancel:

from tkinter import *
from random import shuffle, random, choice
from tkinter.messagebox import *
from tkinter.ttk import Progressbar
import logging, sys


logging.basicConfig(level= logging.DEBUG)
#logging.disable(logging.CRITICAL)

class Start_Stop(Frame):
    def __init__(self, parent=None):
        self.parent= parent
        Frame.__init__(self, self.parent)
        self.pack(expand=YES, fill=BOTH)
        
        self.canvas= Canvas(self)
        self.canvas.config(width= 800, height= 700, bg='skyblue')
        self.canvas.pack(expand=YES, fill=BOTH)
        
        self.btn= Button(self.canvas, text='Start', command= self.get_entry)
        self.btn.place(x=400,y=600)
        
        self.progress_bar= Progressbar(self.canvas, orient='horizontal',
                                       length=500, mode='determinate')
        self.progress_bar.place(x=50, y=350)

        self.btn2= Button(self.canvas, text='Stop', command= self.stop_timer,
                          state='disabled')
        self.btn2.place(x=200,y=600)
        self.btn3= Button(self.canvas, text='reset', command= self.reset,
                          state='disabled')
        self.btn3.place(x=300,y=600)
        
        
        self.bind_all('<Key>', self.key)
        self.g_count=0
        self.timer= 18
        self.start_time=0
    def key(self, event):
        self.g_count +=1
        message= 'count:{0} key:{1} num:{2} state:{3}'.format(self.g_count,
                                                 event.keysym,event.keysym_num,
                                       event.state)
        logging.debug(message)
        
    def get_entry(self):
        self.btn2.config(state='normal')
        self.progress_bar['value']=0        
        self.progress_bar['maximum']= self.timer
        self.end_time= self.timer
        self.read_time()
    def read_time(self):
        self.start_time +=1
        self.progress_bar['value']= self.start_time
        if self.start_time < self.end_time:
            self.pots= self.after(1000, self.read_time)
        else:
            self.btn.config(state='disabled')
            self.btn2.config(state='disabled')
            self.btn3.config(state='normal')
    def reset(self):
        self.start_time=0
        self.btn.config(state='normal')
        self.btn3.config(state='disabled')
        self.progress_bar['value']=0 
        
    def stop_timer(self):        
        self.after_cancel(self.pots)
        
if __name__ == '__main__':
    root= Tk()
    Start_Stop(root)
    root.mainloop()

[deanhystad]

import tkinter
from tkinter import ttk

task_running = False

def update_progress():
    global task_running
    if task_running:
        if progress_bar['value'] == 100:
            progress_bar['value'] = 0
        else:
            progress_bar['value'] += 5
        root.after(100, update_progress)

def start_stop():
    global task_running
    if task_running:
        task_running = False
    else:
        task_running = True
        update_progress()

root = tkinter.Tk() 
progress_bar = ttk.Progressbar(root, length=100, orient=tkinter.HORIZONTAL, mode="determinate")
progress_bar.grid(row=0, column=0)
tkinter.Button(root, text="Push me", command = start_stop).grid(row=1, column=0)
 
root.mainloop()