PyQt5 QComboBox - Change border style when it is in off state and mouse hover over it

Last Updated : 01 Feb, 2023

In this article we will see how we can change the border style of the combo box when it is in off state and mouse hover over it, border style can be dotted, dashed etc. When we set border to the combo box it is continuous although we can change it. Styled border will be only visible when combo box is in off state and cursor is on the combo box else normal border will be visible. In order to do this we have to change the style sheet associated with the combo box, below is the style sheet code

QComboBox::!off:hover
{
border : 4px black;
border-style : dotted;
}

Below is the implementation

Python3

# 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 check-able combo box object
        self.combo_box = QComboBox(self)

        # setting geometry of combo box
        self.combo_box.setGeometry(200, 150, 100, 40)

        # making combo box editable
        # self.combo_box.setEditable(True)

        # 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)

        # setting stylesheet of the combo box
        # set the border style wen it is in off state
        # and mouse hover over it
        self.combo_box.setStyleSheet("QComboBox"
                                     "{"
                                     "border : 4px solid black"
                                     "}"
                                     "QComboBox::! off:hover"
                                     "{"
                                     "border : 4px black;"
                                     "border-style : dotted;"
                                     "}")

# create pyqt5 app
App = QApplication(sys.argv)

# create the instance of our Window
window = Window()

# start the app
sys.exit(App.exec())