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PyQt5 Label – Get Opacity effect object
  • Last Updated : 10 May, 2020

In this article we will see how we can get opacity effect object of the label by default there is no opacity effect to the label although we can create opacity effect then add it to the label with the help of setGraphicsEffect method.

In order to do this we have to do the following –

1. Create a label
2. Set geometry to the label
3. Create a QGraphicsOpacityEffect object
4. Add this object to the label with the help of setGraphicsEffect method
5. Get the opacity object with the help of graphicsEffect method

Note : This object have same properties of the original object

Syntax :



# creating a opacity effect
opacity_effect = QGraphicsOpacityEffect()

# adding opacity effect to the label
label.setGraphicsEffect(opacity_effect)

# getting the opacity object
object = label.graphicsEffect()

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, 600, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for widgets
    def UiComponents(self):
  
        # creating label
        label = QLabel("Label", self)
  
        # setting geometry to the label
        label.setGeometry(200, 100, 150, 60)
  
        # setting alignment to the label
        label.setAlignment(Qt.AlignCenter)
  
        # setting font
        label.setFont(QFont('Arial', 15))
  
        # setting style sheet of the label
        label.setStyleSheet("QLabel"
                            "{"
                            "border : 2px solid green;"
                            "background : lightgreen;"
                            "}")
  
        # creating a opacity effect
        self.opacity_effect = QGraphicsOpacityEffect()
   
        # setting opacity level
        self.opacity_effect.setOpacity(0.3)
  
        # adding opacity effect to the label
        label.setGraphicsEffect(self.opacity_effect)
  
        # result label
        result = QLabel(self)
  
        # setting geometry of the result label
        result.setGeometry(200, 200, 300, 30)
  
        # getting the opacity object
        object = label.graphicsEffect()
  
        # setting text to the result label
        result.setText(str(object))
  
  
# 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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