PyQt5 - QComboBox Widget

A QComboBox object presents a dropdown list of items to select from. It takes minimum screen space on the form required to display only the currently selected item.

A Combo box can be set to be editable; it can also store pixmap objects. The following methods are commonly used −

QComboBox Signals

The following methods are commonly used in QComboBox Signals −

Example

Let us see how some features of QComboBox widget are implemented in the following example.

Items are added in the collection individually by addItem() method or items in a List object by addItems() method.

self.cb.addItem("C++")
self.cb.addItems(["Java", "C#", "Python"])

QComboBox object emits currentIndexChanged() signal. It is connected to selectionchange() method.

Items in a combo box are listed using itemText() method for each item. Label belonging to the currently chosen item is accessed by currentText() method.

def selectionchange(self,i):
   print "Items in the list are :"
	
   for count in range(self.cb.count()):
      print self.cb.itemText(count)
   print "Current index",i,"selection changed ",self.cb.currentText()

The entire code is as follows −

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class combodemo(QWidget):
   def __init__(self, parent = None):
      super(combodemo, self).__init__(parent)
      
      layout = QHBoxLayout()
      self.cb = QComboBox()
      self.cb.addItem("C")
      self.cb.addItem("C++")
      self.cb.addItems(["Java", "C#", "Python"])
      self.cb.currentIndexChanged.connect(self.selectionchange)
		
      layout.addWidget(self.cb)
      self.setLayout(layout)
      self.setWindowTitle("combo box demo")

   def selectionchange(self,i):
      print "Items in the list are :"
		
      for count in range(self.cb.count()):
         print self.cb.itemText(count)
      print "Current index",i,"selection changed ",self.cb.currentText()
		
def main():
   app = QApplication(sys.argv)
   ex = combodemo()
   ex.show()
   sys.exit(app.exec_())

if __name__ == '__main__':
   main()

Output

The above code produces the following output −

Items in the list are −

C
C++
Java
C#
Python
Current selection index 4 selection changed Python