Скачать или смотреть How to Determine the Visible Tab in a Tkinter Notebook

Learn how to find out which tab is currently selected in a Tkinter Notebook using simple methods in Python. This guide will walk you through the steps for implementing tab visibility checks effectively.
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This video is based on the question https://stackoverflow.com/q/62897457/ asked by the user 'Stephen' ( https://stackoverflow.com/u/13807781/ ) and on the answer https://stackoverflow.com/a/62898105/ provided by the user 'typedecker' ( https://stackoverflow.com/u/10441598/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Finding the "Visible" Tkinter Frame

When working with Python's tkinter package, you may encounter scenarios where you need to determine which tab is currently being viewed in a Notebook widget. This can be particularly useful when you want to trigger certain actions based on user interaction with different tabs.

In this guide, we’ll cover how to find out WHICH tab the user is currently viewing in a Tkinter Notebook object, allowing you to execute code accordingly.

Problem Statement

You’ve created a notebook with two tabs, like this:

[[See Video to Reveal this Text or Code Snippet]]

Your goal is to write a function that prints a "1" if the user is on Tab 1 and a "2" if they are on Tab 2. However, you are probably wondering if there’s a straightforward method (like frame1.isvisible()) to achieve this—unfortunately, there isn’t!

Solution Overview

Fortunately, there are several methods available in tkinter to help you find out which tab is currently selected. Let's explore these options step by step.

Method 1: Using notebook.select()

The select() method of the Notebook widget returns the ID of the currently selected tab. However, this doesn’t give you a direct answer; instead, you will need the tab index.

Here's how you can do it:

[[See Video to Reveal this Text or Code Snippet]]

Method 2: Accessing Tab Names

If you want to retrieve the actual tab names instead of their IDs or indexes, you can use the tab() method along with the recently obtained tab ID. Here’s how it works:

[[See Video to Reveal this Text or Code Snippet]]

This current_tab_name will contain the text that you assigned to the tab (either "Tab 1" or "Tab 2").

Method 3: Using the current Tag

An alternative and simpler method is to use the special 'current' tag, which automatically tracks the currently visible tab. Here’s how you access it:

[[See Video to Reveal this Text or Code Snippet]]

This will also yield the index of the visible tab.

Putting It All Together

With these methods in hand, you can now easily create a function that checks every few seconds which tab is currently being viewed. Here’s a simple function that prints the tab index at regular intervals:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By utilizing the select and tab methods of the notebook widget, you can easily determine which tab is currently being viewed in your Tkinter application. This functionality can significantly enhance user interaction and overall application responsiveness.

Now that you’re equipped with this knowledge, get creative and implement tab visibility checks in your Tkinter applications!