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PyQt5 QSlider | Python

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  • Last Updated : 27 Sep, 2019

Slider in PyQt5 is used to set a value with the help of an indicator which can move back and forth over a graphical slide or bar. Many times one needs to provide values which lie between a range and in such cases slider is very useful. QSlider is the class used to add slider in an application.

Example:

A window has a slider and a label(QSlider). The size of the text gets scaled in or out as one move the indicator of the slider.




from PyQt5 import QtCore, QtGui, QtWidgets
import sys
  
class Ui_MainWindow(object):
  
    def setupUi(self, MainWindow):
  
        MainWindow.resize(550, 393)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
  
        self.slider = QtWidgets.QSlider(self.centralwidget)
        self.slider.setGeometry(QtCore.QRect(190, 100, 160, 16))
        self.slider.setOrientation(QtCore.Qt.Horizontal)
  
        # After each value change, slot "scaletext" will get invoked.
        self.slider.valueChanged.connect(self.scaletext)
  
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(230, 150, 301, 161))
          
        # set initial font size of label.
        self.font = QtGui.QFont()
        self.font.setPointSize(7)
        self.label.setFont(self.font)
        MainWindow.setCentralWidget(self.centralwidget)
  
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
  
    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "QSlider"))
          
    def scaletext(self, value):
        # Change font size of label. Size value could 
        # be anything consistent with the dimension of label.
        self.font.setPointSize(7 + value//2)
        self.label.setFont(self.font)
      
      
if __name__ == "__main__"
    app = QtWidgets.QApplication(sys.argv) 
    
    MainWindow = QtWidgets.QMainWindow() 
    ui = Ui_MainWindow() 
    ui.setupUi(MainWindow) 
    MainWindow.show() 
    sys.exit(app.exec_()) 


Output:


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