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PyQt5 QLabel – Disabling the opacity effect according to the user

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  • Last Updated : 10 May, 2020

In this article we will see how we can disable the opacity effect of the label according to the user instruction such that when user check the radio button opacity effect should disappear and when user uncheck the radio button it should appear again.

In order to make the opacity effect disable and enable we use setEnable method.

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

1. Create a label
2. Create an opacity effect object and set it to the label
3. Create a radio button
4. Add action to the radio button
5. Inside the action check if radio button is checked, it checked make opacity effect disable
6. Else make opacity effect enable

Syntax : opacity_effect.setEnabled(False)

Argument : It takes bool 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):
        # setting title
        self.setWindowTitle("Python ")
        # setting geometry
        self.setGeometry(100, 100, 600, 400)
        # calling method
        # showing all the widgets
    # 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
        # setting font
        label.setFont(QFont('Arial', 15))
        # setting style sheet of the label
                            "border : 2px solid green;"
                            "background : lightgreen;"
        # creating a opacity effect
        self.opacity_effect = QGraphicsOpacityEffect()
        # setting opacity level
        # adding opacity effect to the label
        # creating a radio button
        self.button = QRadioButton("Disable opacity effect", self)
        # setting geometry
        self.button.setGeometry(200, 200, 300, 30)
        # adding action to the button
    # action called by the radio button
    def do_something(self):
        # radio is checked ?
        if self.button.isChecked() == True:
            # making opacity effect disable
            # making opacity color effect enable
# create pyqt5 app
App = QApplication(sys.argv)
# create the instance of our Window
window = Window()
# start the app

Output :

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