In this article we will see how to set the color to the check box when it get pressed while in the intermediate state. By default no pressed color is set to the label part of the check box, although indicator by default has a light blue background color when it get pressed. Intermediate state is a state inbetween checked and unchecked state it is the third state which is created with the help of setTristate method. In order to add background color to the check box when pressed from intermediate(indeterminate) state, we have to edit the style sheet code which is used with check box object. Below is the style sheet code.
QCheckBox::indeterminate:pressed
{
background-color : cyan;
}
Below is the implementation.
Python3
# importing librariesfrom PyQt5.QtWidgets import *from PyQt5 import QtCore, QtGuifrom PyQt5.QtGui import *from PyQt5.QtCore import *import sysclass Window(QMainWindow):    def __init__(self):        super().__init__()        # setting title        self.setWindowTitle("Python ")        # setting geometry        self.setGeometry(100, 100, 600, 400)        # calling method        self.UiComponents()        # showing all the widgets        self.show()    # method for widgets    def UiComponents(self):        # creating the check-box        checkbox = QCheckBox('Geek ?', self)        # setting tristate check box        checkbox.setTristate(True)        # setting geometry of check box        checkbox.setGeometry(200, 150, 100, 30)        # adding background color to the pressed check box label part        # when it is in intermediate state        checkbox.setStyleSheet("QCheckBox:indeterminate:pressed"                               "{"                               "background-color : cyan;"                               "}")# create pyqt5 appApp = QApplication(sys.argv)# create the instance of our Windowwindow = Window()# start the appsys.exit(App.exec()) | 
Output :
