In this article we will see how we can set inverted control property of QScrollBar. QScrollBar is a control that enables the user to access parts of a document that is larger than the widget used to display it. Slider is the scroll-able object inside the bar. This property holds whether or not the slider inverts its wheel and key events. If this property is false, scrolling the mouse wheel “up” and using keys like page up will increase the slider’s value towards its maximum. Otherwise pressing page up will move value towards the slider’s minimum.
In order to do this we will use setInvertedControls method with the scroll bar object. Syntax : scroll.setInvertedControls(True) Argument : It takes bool as argument Return : It returns None
Below is the implementation
Python3
# importing librariesfrom PyQt5.QtWidgets import *from PyQt5 import QtCore, QtGuifrom PyQt5.QtGui import *from PyQt5.QtCore import *import sysclass 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): scroll = QScrollBar(self) # setting geometry of the scroll bar scroll.setGeometry(100, 50, 30, 200) # making its background color to green scroll.setStyleSheet("background : lightgrey;") # setting inverted appearance scroll.setInvertedAppearance(True) # setting inverted control scroll.setInvertedControls(True) # creating a label label = QLabel("neveropen", self) # setting geometry to the label label.setGeometry(200, 100, 300, 80) # making label multi line label.setWordWrap(True) # getting value changed signal scroll.valueChanged.connect(lambda: do_action()) # method called when signal is emitted def do_action(): # setting text to the label label.setText("Current Value : " + str(scroll.value()))# create pyqt5 appApp = QApplication(sys.argv)# create the instance of our Windowwindow = Window()# start the appsys.exit(App.exec()) |
Output :
