Understanding QTextEdit in QT Programming

Introduction

QTextEdit is a powerful widget in QT that provides a rich text editing functionality.

Common Functions of QTextEdit

1. setText(): The setText() function allows you to set the text content of the QTextEdit widget. You can pass a QString as an argument to set the desired text.
2. toPlainText(): The toPlainText() function returns the plain text content of the QTextEdit widget. It is particularly useful when you need to retrieve the text entered by the user.
3. setReadOnly(): The setReadOnly() function can be used to make the QTextEdit widget read-only. This is useful when you want to display text that should not be editable by the user.
4. setFont(): The setFont() function allows you to set the font of the text displayed in the QTextEdit widget. You can specify the font family, size, and other properties using the QFont class.
5. append(): The append() function appends the given text to the existing content of the QTextEdit widget. It is useful when you want to dynamically add text to the widget without replacing the existing content.

Sample Code

#include <QApplication>
#include <QTextEdit>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    // Create a QTextEdit widget
    QTextEdit textEdit;

    // Set the text content
    textEdit.setText("Hello, world!");

    // Set the font
    QFont font("Arial", 12);
    textEdit.setFont(font);

    // Append additional text
    textEdit.append("This is a sample code for QTextEdit.");

    // Set the widget as read-only
    textEdit.setReadOnly(true);

    // Show the widget
    textEdit.show();

    return app.exec();
}

In this sample code, we create a QTextEdit widget and set its text content to “Hello, world!”. We also set the font to Arial with a size of 12. The append() function is used to add the text “This is a sample code for QTextEdit.” to the existing content. Finally, we set the widget as read-only using the setReadOnly() function.

Conclusion

QTextEdit is a versatile widget in QT that provides rich text editing capabilities. We discussed some common functions of QTextEdit, including setText(), toPlainText(), setReadOnly(), setFont(), and append().