PyQt5 – Combo Box with check-able items

In this article we will see how we can make a combo box who have check-able items. By default when we create a combo box its items are not check-able i.e we can select any one item at a time although we can create such combo box by editing the combo box class. Below is the representation of how check-able combo box look like.

In order to do this we have to make a new editable combo box class which inherits the combo box and adds a new feature of check able combo box, below is the syntax of new class

class CheckableComboBox(QComboBox):
    def __init__(self, parent = None):
        super(CheckableComboBox, self).__init__(parent)
        self.view().pressed.connect(self.handleItemPressed)
        self.setModel(QStandardItemModel(self))

    def handleItemPressed(self, index):
        item = self.model().itemFromIndex(index)
        if item.checkState() == Qt.Checked:
            item.setCheckState(Qt.Unchecked)
        else:
            item.setCheckState(Qt.Checked)

Below is the implementation –

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# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
# new check-able combo box
class CheckableComboBox(QComboBox):
      
    # constructor
    def __init__(self, parent = None):
        super(CheckableComboBox, self).__init__(parent)
        self.view().pressed.connect(self.handleItemPressed)
        self.setModel(QStandardItemModel(self))
  
    # when any item get pressed
    def handleItemPressed(self, index):
          
        # getting the item
        item = self.model().itemFromIndex(index)
          
        # checking if item is checked
        if item.checkState() == Qt.Checked:
              
            # making it unchecked
            item.setCheckState(Qt.Unchecked)
              
        # if not checked
        else:
            # making the item checked
            item.setCheckState(Qt.Checked)
  
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 = CheckableComboBox(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)
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
window.show()
  
# start the app
sys.exit(App.exec())

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