In this article we will see how we can set window opacity property to the 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 the level of opacity for the window. The valid range of opacity is from 1.0 (completely opaque) to 0.0 (completely transparent).
Note : On X11 you need to have a composite manager running, and the X11 specific _NET_WM_WINDOW_OPACITY atom needs to be supported by the window manager you are using.
In order to do this we will use
setWindowOpacity
method with the scroll bar object.Syntax : scroll.setWindowOpacity(n)
Argument : It takes float 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 ):
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 window opacity property
scroll.setWindowOpacity( 1.0 )
# creating a label
label = QLabel( "GeesforGeeks" , 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 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 :