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( "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 ())
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Output :