PyQt5 QCheckBox

Introduction

QCheckBox is a type of checkbox button that allows the user to select one or more options. It is a widget in PyQt5, a Python module that allows us to create desktop applications that run on Windows, Mac OS X, and Linux. QCheckBox is a useful interface element when building a program that requires users to make a choice between multiple options. Through this widget, the user can select or deselect one or more items, depending on the intended behavior.

Usage

QCheckBox is used to define a checkbox that can be added to the user interface of a desktop application. The widget can be added either programmatically or through the Qt Designer. It can be manipulated both visually and programmatically, allowing the user to have control over its display and the application's behavior.

Creating QCheckBox

The following code snippet shows how to create a QCheckBox in Python:

from PyQt5 import QtWidgets

checkbox = QtWidgets.QCheckBox('Check me!')

This will create a checkbox with the specified text.

Setting Checked State

To set the checked state of the checkbox, use the setChecked() method:

checkbox.setChecked(True)

This will set the checkbox to be checked.

Getting Checked State

To get the current checked state of the checkbox, use the isChecked() method:

is_checked = checkbox.isChecked()

This will return True if the checkbox is currently checked, and False otherwise.

Toggling Checked State

To toggle the checked state of the checkbox, use the toggle() method:

checkbox.toggle() # will toggle the checked state of the checkbox

Connecting Signals and Slots

To connect a signal to a slot, use the connect() method:

def on_checkbox_checked(checked):
    if checked:
        print('Checkbox is checked')
    else:
        print('Checkbox is not checked')

checkbox.stateChanged.connect(on_checkbox_checked)

This will connect the checkbox's stateChanged signal to the on_checkbox_checked function when the checked state is changed.

Conclusion

In this article, we introduced the QCheckBox widget in PyQt5 and demonstrated how to create, manipulate, and connect signals to it. QCheckBox is a useful widget for building desktop applications that require user-selected options. Its flexibility makes it a popular choice among PyQt5 developers.