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PyQt5 – Background color to ComboBox if it is ON state

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In this article we will see how we can set the background color to the combo box when it is in on state. By default combo box is of grey color although we can change its color. This background color only appear when combo box widget is in on state. On state of combo box is basically when the drop down menu is open. In order to do this we have to change the style sheet code of the combo box, below is the style sheet code
QComboBox::on
{
background-color : lightgreen;
}
Below is the implementation
# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
  
class 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 a combo box widget
        self.combo_box = QComboBox(self)
  
        # setting geometry of combo box
        self.combo_box.setGeometry(200, 150, 150, 30)
  
        # geek list
        geek_list = ["Sayian", "Super Sayian", "Super Sayian 2", "Super Sayian B"]
  
  
        # adding list of items to combo box
        self.combo_box.addItems(geek_list)
  
        # adding background color to the combo box when it is in ON state
        self.combo_box.setStyleSheet("QComboBox::on"
                                     "{"
                                     "background-color: lightgreen;"
                                     "}")
  
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

                    
Output : When we open drop down menu

Last Updated : 22 Apr, 2020
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