Скачать или смотреть Creating a Tkinter Progress Widget

Learn how to create a `Tkinter` progress widget that appears at the start of a function and disappears at the end, enhancing your application's UI.
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This video is based on the question https://stackoverflow.com/q/64575185/ asked by the user 'Josh Fox' ( https://stackoverflow.com/u/12367592/ ) and on the answer https://stackoverflow.com/a/64575678/ provided by the user 'acw1668' ( https://stackoverflow.com/u/5317403/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Tkinter Progress Widget: A Step-by-Step Guide

If you're building a graphical user interface (GUI) application in Python using Tkinter, you may have encountered scenarios where a task takes a considerable amount of time to complete. In such cases, it's a good practice to inform users that a process is ongoing. One effective way to do this is by using a progress bar.

In this guide, I'll guide you through how to create a Tkinter progress widget that appears at the beginning of a function execution and is destroyed at the end. Let’s address the common problem: How can you show a progress bar while your application is busy processing tasks, such as reading a file?

The Problem

Your function may need to perform a lengthy task, such as reading a large CSV file with pandas. During this time, it’s essential to provide feedback to the user so they’re aware that the application is busy. The desired sequence for the application is:

The button (Bt1) is disabled or removed.

A progress bar is displayed to signify that processing is occurring.

The file is read, and once that is complete, the progress bar is removed.

Proposed Solution

To manage this in a Tkinter application, we need to make use of threading. This allows our application to continue responding to user interactions while a lengthy task is performed in the background. Here’s how you can implement this:

Step-by-Step Code Guide

Import Required Libraries:
You'll need to import Tkinter and other required libraries for your application.

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Set Up the Main Application Window:
We’ll create the main application window where all components will reside.

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Define Lengthy Function:
This function will handle the primary task of reading the file and notifying the main thread that the task is complete.

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Define the Main Function:
This function initiates the progress bar and starts the background thread to handle the task.

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Create the Button:
The button that triggers the function.

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Run the Main Event Loop:
This keeps the application running and responsive.

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Complete Code

Putting everything together, here is the complete code:

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Conclusion

By using threading and a Tkinter progress widget, you can create a user-friendly experience that indicates to users that a process is underway. This technique not only enhances your application's functionality but also improves user satisfaction by providing clear feedback during longer operations. So, the next time you're working with time-consuming tasks, consider implementing a progress bar like this!