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PyQt5 QDial – Slider’s Value Changed Signal

  • Last Updated : 07 Jul, 2020

In this article we will see how we can get slider’s value changed signal of the QDial. User can change the value with the help of mouse although we can change it programmatically with the help of setValue method. This signal is emitted when the slider value gets changed.

In order to do this we use valueChanged method with the QDial object

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Syntax : dial.valueChanged.connect(method)



Argument : It takes method as 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, 500, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for components
    def UiComponents(self):
  
        # creating QDial object
        dial = QDial(self)
  
        # setting geometry to the dial
        dial.setGeometry(100, 100, 100, 100)
  
        # making notch visible
        dial.setNotchesVisible(True)
  
        # value
        value = 50
  
        # setting value to the dial slider
        dial.setValue(value)
  
  
        # creating a label
        label = QLabel("GeeksforGeeks", self)
  
        # setting geometry to the label
        label.setGeometry(220, 125, 200, 60)
  
        # making label multiline
        label.setWordWrap(True)
  
        # getting slider value
        value = dial.value()
  
        # setting text to the label
        label.setText("Value : " + str(value))
  
        # getting value changed signal
        dial.valueChanged.connect(lambda: label.setText("Value = " + str(dial.value())))
  
  
  
# 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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