Скачать или смотреть How to Copy and Change Label Text in Tkinter

Learn how to copy a label's text and update it upon a button click in Tkinter. Follow our step-by-step guide for this useful Python GUI feature.
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This video is based on the question https://stackoverflow.com/q/72069324/ asked by the user 'Martin Kunze' ( https://stackoverflow.com/u/6200611/ ) and on the answer https://stackoverflow.com/a/72069375/ provided by the user 'Sharim09' ( https://stackoverflow.com/u/17507911/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Copy and Change Label Text in Tkinter

Creating a user interface with Tkinter in Python can be quite engaging, particularly when you want your application to be interactive and dynamic. One common task developers might face is the requirement to copy a label's text to another widget and change it upon a button click. In this post, we will demonstrate how to achieve this effectively, keeping it straightforward and practical.

The Problem Explained

In our Tkinter application, we want to copy the text from a label and make it available in a read-only entry field. When a button is clicked, the entry field should display the text "This is some test!". However, since the entry field is set to read-only mode (state="readonly"), we cannot directly change its text—no action occurs when we attempt to update it. Let's explore how to resolve this issue.

Step-by-Step Solution

Method 1: Changing the Entry State Temporarily

Here is how we can change the state of the entry field temporarily to allow for text insertion, and then set it back to read-only. This ensures that users cannot modify the text later on.

Code Implementation

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

Explanation of the Code

Importing Tkinter Modules: We first import the necessary classes from the Tkinter library.

Function Definition: The apply_text function accepts the entry widget as a parameter. Within this function:

We set the state to 'normal', allowing modifications to the entry field.

The delete method clears any existing text to ensure a fresh entry.

We insert the desired text using the insert method and finally set the state back to 'readonly'.

Creating Widgets: We create an entry widget lbl and a button btn. The button's command is tied to our apply_text function.

Packing Widgets: Lastly, we pack both widgets to display them on the window and run the application loop with mainloop().

Method 2: Utilizing StringVar

Another efficient approach to handle text changes is by using the StringVar class, which is specially designed for managing string values in Tkinter.

Code Implementation

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

Explanation of the Code

Using StringVar: We create a StringVar called eText that holds the text for our entry widget. This allows for dynamic updating of the text displayed in the entry.

Linking StringVar to Entry: The textvariable parameter of the Entry widget is set to our eText, making it reactive to any changes we apply.

Updating Text: Instead of modifying the entry directly, we update the StringVar, which automatically refreshes the entry contents.

Conclusion

Both methods presented here are effective for copying label text and updating it in a read-only entry widget. Depending on your specific needs and preferences, you can choose to toggle the entry's state or leverage StringVar for more efficient text management. This task not only enhances user interaction but also illustrates the flexibility of Tkinter for developing dynamic applications.

Now you can implement this functionality in your own Tkinter projects, making them more interactive and user-friendly!