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PyQt5 – Get opacity level of the main window | windowOpacity() method
  • Last Updated : 26 Mar, 2020

windowOpacity() method allows us to see the opacity level of the main window. Opacity is the measure of impenetrability to electromagnetic or other kinds of radiation, especially visible light. In radiative transfer, it describes the absorption and scattering of radiation in a medium, such as a plasma, dielectric, shielding material, glass, etc.

Opacity level ranges from 0.0 to 1.0, where 0.0 means completely transparent and 1.0 means completely opaque, by default it is 1.0 i.e completely opaque.

Syntax : self.windowOpacity()

Argument : It takes no argument.

Return : Returns a float value ranging from 0.0 to 1.0



Example 1:




# importing the required libraries
  
from PyQt5.QtCore import * 
from PyQt5.QtGui import * 
from PyQt5.QtWidgets import * 
import sys
  
  
class Window(QMainWindow):
  
  
    def __init__(self):
        super().__init__()
  
  
        # set the title
        self.setWindowTitle("Python")
  
        # setting  the geometry of window
        self.setGeometry(60, 60, 600, 400)
  
        # getting opacity level
        level = str(self.windowOpacity())
  
        # creating a label widget
        self.label_1 = QLabel(level, self)
  
        # moving position
        self.label_1.move(100, 100)
  
        # setting up the border
        self.label_1.setStyleSheet("border :3px solid blue;")
  
        # show all the widgets
        self.show()
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
# start the app
sys.exit(App.exec())

Output :

 
Example 2:




# importing the required libraries
  
from PyQt5.QtCore import * 
from PyQt5.QtGui import * 
from PyQt5.QtWidgets import * 
import sys
  
  
class Window(QMainWindow):
  
  
    def __init__(self):
        super().__init__()
  
  
        # set the title
        self.setWindowTitle("Python")
  
        # setting  the geometry of window
        self.setGeometry(60, 60, 600, 400)
  
        # setting opacity level
        self.setWindowOpacity(0.7)
  
        # getting opacity level
        level = str(self.windowOpacity())
  
        # creating a label widget
        self.label_1 = QLabel(level, self)
        # moving position
        self.label_1.move(100, 100)
  
        # setting up the border
        self.label_1.setStyleSheet("border :3px solid blue;")
  
        # show all the widgets
        self.show()
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
# start the app
sys.exit(App.exec())

Output :

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