Скачать или смотреть Insert Text Before and After Selected Text in PyQt5 QPlainTextEdit

Discover how to easily modify selected text in PyQt5's QPlainTextEdit by adding text around it. This guide provides step-by-step instructions and sample code to create a rich text editing experience.
---
This video is based on the question https://stackoverflow.com/q/70828491/ asked by the user 'Jr.Abdul Wahab Melethil' ( https://stackoverflow.com/u/16542086/ ) and on the answer https://stackoverflow.com/a/70830351/ provided by the user 'Domarm' ( https://stackoverflow.com/u/17872926/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Insert text before and after selected text in PyQt5 QPlainTextEdit

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Insert Text Before and After Selected Text in PyQt5 QPlainTextEdit

If you are working on a PyQt5 application that requires text editing, you may encounter a scenario where you want to insert text before and after the currently selected text. For instance, let’s say you've written "My name is AbdulWahab," and you wish to select "AbdulWahab" to wrap it in parentheses when pressing the left parentheses key (. This feature can significantly enhance user interaction, making text editing intuitive and fluid.

In this guide, we will go through the process of achieving this functionality step-by-step, using the QPlainTextEdit widget in PyQt5.

Understanding the Problem

The goal here is to modify the user’s input behavior in a text editor. Specifically, when the user selects a piece of text and presses a specific key (in this case, the left parenthesis), the application should automatically wrap the selected text in parentheses. This can improve productivity for users who frequently need to wrap terms or phrases in their text.

The Solution

To implement this feature, we'll need to capture key presses in the QPlainTextEdit widget and act upon them. The most effective way to do this in PyQt5 is by subclassing QPlainTextEdit and overriding the keyPressEvent method.

Step-by-Step Implementation

Import Necessary Modules
We'll begin by importing the required modules from PyQt5.

Subclass QPlainTextEdit
We will create a new class called SmartTextEdit that inherits from QPlainTextEdit.

Override the Key Press Event
Within the SmartTextEdit class, we will override the keyPressEvent method to handle the left parenthesis key press. If the user has selected text, we'll modify it accordingly.

Build the Main Window
Finally, we will create a main application window that utilizes our custom text edit widget.

Sample Code

Here is the complete code for the implementation:

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

Explanation of the Code

Imports: We import necessary PyQt5 classes for GUI, including QApplication, QMainWindow, and QPlainTextEdit.

Custom Text Edit:

The SmartTextEdit class captures the key press event and checks if the left parenthesis key is pressed.

If some text is selected, it inserts parentheses around the selected text using the insertText method of the QTextCursor.

Main Window:

A MainWindow class is created to house our custom text editor, which is then displayed upon execution of the application.

Conclusion

With this simple implementation, you can greatly enhance the text editing capabilities of your PyQt5 applications. By wrapping selected text in parentheses, you improve user efficiency and experience. This functionality can be further built upon by adding more key events or text wrapping features as needed.

Feel free to copy the code provided above and integrate it into your own applications. Happy coding!