PyQt5 Label - 获取不透明度效果对象

在本文中，我们将看到如何获取标签的不透明效果对象，默认情况下标签没有不透明效果，尽管我们可以创建不透明效果，然后在setGraphicsEffect方法的帮助下将其添加到标签中。

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

编程需要懂一点英语

注意：此对象与原始对象具有相同的属性

句法：

# creating a opacity effect
opacity_effect = QGraphicsOpacityEffect()

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

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

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)
  
        # 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())

输出：