ProgressBar dialog

When doing a long-running operation, the most frequent way to inform a user of progress is through a progress bar.

While running an operation in a thread, we can update a progress bar to show that the operation is moving forward and give the user a hint about the time it might take to complete the work:

How to do it...

The simpledialog.SimpleDialog widget is used to create simple dialogs with some text and buttons. We are going to leverage it to display a progress bar instead of the buttons:

import tkinter
from tkinter import simpledialog
from tkinter import ttk

from queue import Queue

class ProgressDialog(simpledialog.SimpleDialog):
    def __init__(self, master, text='', title=None, class_...