PyQt5:创建带有不透明小部件的透明窗口

from PyQt5.QtWidgets import QApplication, QWidget, QLabel
from PyQt5.QtGui import QPainter, QColor
from PyQt5.QtCore import Qt

class TransparentWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowFlags(Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint)
        self.setAttribute(Qt.WA_TranslucentBackground)

    def paintEvent(self, event):
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)
        painter.fillRect(self.rect(), QColor(0, 0, 0, 0))

class TransparentWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowFlags(Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint)
        self.setAttribute(Qt.WA_TranslucentBackground)

        self.label = QLabel("Hello, World!", self)
        self.label.setStyleSheet("background-color: white; color: black;")
        self.label.setGeometry(50, 50, 200, 50)

if __name__ == '__main__':
    app = QApplication([])
    window = TransparentWindow()
    window.show()
    app.exec()