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+--- Thread: Progressbar with start and stop (/thread-31199.html)
Progressbar with start and stop - jelo34 - Nov-27-2020
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()
RE: Progressbar with start and stop - deanhystad - Nov-27-2020
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.
RE: Progressbar with start and stop - joe_momma - Nov-28-2020
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()
RE: Progressbar with start and stop - deanhystad - Nov-30-2020
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()