PyQt5 QLabel – 根据用户禁用不透明效果

在本文中，我们将看到如何根据用户说明禁用标签的不透明度效果，这样当用户选中单选按钮时，不透明度效果应该消失，而当用户取消选中单选按钮时，它应该再次出现。

为了使不透明效果禁用和启用，我们使用setEnable方法。

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

编程需要懂一点英语

Syntax : opacity_effect.setEnabled(False)

Argument : It takes bool as argument

Return : It returns none

编程需要懂一点英语

下面是实现

# 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)
  
        # 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
        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 opacity effect disable
            self.opacity_effect.setEnabled(False)
  
        else:
            # making opacity color effect enable
            self.opacity_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())

输出：