如何在QMainWindow中显示发光标签

from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel
from PyQt5.QtGui import QColor, QPainter, QPalette, QGraphicsDropShadowEffect
from PyQt5.QtCore import Qt

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Glowing Label Example")

        # 创建发光标签
        glowing_label = QLabel(self)
        glowing_label.setText("Glowing Label")
        glowing_label.setAlignment(Qt.AlignCenter)
        glowing_label.setFixedSize(200, 50)

        # 创建发光效果
        glow_effect = QGraphicsDropShadowEffect()
        glow_effect.setColor(QColor(255, 255, 0))  # 设置发光颜色为黄色
        glow_effect.setBlurRadius(10)  # 设置阴影模糊半径
        glow_effect.setOffset(0, 0)  # 设置发光偏移量

        # 将发光效果应用于标签
        glowing_label.setGraphicsEffect(glow_effect)

        # 将标签添加到主窗口中
        self.setCentralWidget(glowing_label)

if __name__ == "__main__":
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()