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
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("Lazyroar", 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 :
