PyQt5 QSpinBox – Adding action when object name changed

Last Updated : 10 May, 2020

In this article we will see how we can do something the object name of the spin box is changed, object name is basically name given to the object of spin box, when we find the object in the PyQt5 application with the help of object name with the help of findChild method. Object name can be set to the spin box with the help of setObjectName method.

Implementation steps –

1. Create a spin box
2. Set its object name
3. Show the object name with the help of label
4. Add action to the spin box when object name is changed which make the suffix of spin box change
5. Create a push button
6. Add action to the push button change the object name of spin box

In order to add action when object name is changed we use objectNameChanged.connect method..

Syntax : spin_box.objectNameChanged.connect(method name)

Argument : It takes method name as argument

Action performed : It will call the passed method

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 spin box 
        self.spin = QSpinBox(self) 
  
        # setting geometry to spin box 
        self.spin.setGeometry(100, 100, 150, 40) 
  
        # setting suffix to spin 
        self.spin.setSuffix(" Spin Box") 
  
        # name 
        name = "Geeky"
  
        # setting up object name 
        self.spin.setObjectName(name) 
  
        # adding action when the spin box object name is changed 
        self.spin.objectNameChanged.connect(self.spin_method) 
  
  
        # creating label 
        self.label = QLabel(self) 
  
        # setting geometry 
        self.label.setGeometry(100, 200, 300, 40) 
  
        # getting object name 
        get_name = self.spin.objectName() 
  
        # setting text to the label 
        self.label.setText("Object Name : " + get_name) 
  
        # creating a push button 
        push = QPushButton("Press", self) 
  
        # adding action to the push button 
        push.pressed.connect(self.push_method) 
  
    # method called when object name is changed 
    def spin_method(self): 
        # setting suffix 
        self.spin.setSuffix(" Name changed") 
  
    # method called by push button 
    def push_method(self): 
        # setting object name of spin box 
        self.spin.setObjectName("New") 
  
        # getting object name 
        get_name = self.spin.objectName() 
  
        # showing this new name to label 
        self.label.setText("Object Name : " + get_name) 
  
# create pyqt5 app 
App = QApplication(sys.argv) 
  
# create the instance of our Window 
window = Window() 
  
# start the app 
sys.exit(App.exec()) 

Output :

Suggest improvement

PyQt5 QSpinBox - Setting it to read only

PyQt5 QSpinBox – Setting object name

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