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PyQt5 QLabel – Disabling the color effect according to the user
  • Last Updated : 10 May, 2020

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

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

1. Create a label
2. Create a color 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 color effect disable
6. Else make color effect enable

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

Syntax : color_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):
        super().__init__()
  
        # making background color light yellow
        self.setStyleSheet("background : lightyellow;")
  
        # 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))
  
        # creating a color effect
        self.color_effect = QGraphicsColorizeEffect()
  
        # setting color to color effect
        self.color_effect.setColor(Qt.darkBlue)
  
        # adding color effect to the label
        label.setGraphicsEffect(self.color_effect)
  
        # creating a radio button
        self.button = QRadioButton("Disable color filter", self)
  
        # setting geometry
        self.button.setGeometry(200, 200, 300, 30)
  
        # adding action to the button
        self.button.clicked.connect(self.do_something)
  
    # action called by the radio button
    def do_something(self):
        # radio is checked ?
        if self.button.isChecked() == True:
            # making color effect disable
            self.color_effect.setEnabled(False)
  
        else:
            # making color color effect enable
            self.color_effect.setEnabled(True)
  
  
# 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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