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PyQt5 QSpinBox – Checking if signals are blocked or not

  • Last Updated : 17 May, 2020

In this article we will see how we can check if the signals are blocked or not of the spin box, blocking signals means the connected methods with the spin box will not receive the signals for example when we add action to it when its value changes that action will not work. Signals emitted while being blocked are not buffered. In order to block signals we use blockSignals method.

In order to do this we use signalsBlocked method.

Syntax : spin_box.signalsBlocked()

Argument : It takes no argument

Return : It returns None

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, 250, 40)
  
        # setting prefix to spin
        self.spin.setPrefix("Prefix ")
  
        # setting suffix to spin
        self.spin.setSuffix(" Suffix")
  
        # blocking signals of the spin box
        self.spin.blockSignals(True)
  
        # creating a label
        self.label = QLabel("Label ", self)
  
        # setting geometry to the label
        self.label.setGeometry(100, 200, 300, 30)
  
        # checking if signals are blocked or not
        check = self.spin.signalsBlocked()
  
        # setting text to the label
        self.label.setText("Signals Blocked ? : " + str(check))
  
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

Output :


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