在pyqt中更改Tab时淡入淡出

from PyQt5.QtCore import QPropertyAnimation, QEasingCurve
from PyQt5.QtWidgets import QApplication, QMainWindow, QTabWidget, QWidget, QVBoxLayout, QLabel
from PyQt5.QtGui import QColor

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle("Tab Fade Animation Example")
        self.setGeometry(100, 100, 500, 300)

        self.tab_widget = QTabWidget()
        self.setCentralWidget(self.tab_widget)

        self.tab1 = QWidget()
        self.tab2 = QWidget()

        self.tab_widget.addTab(self.tab1, "Tab 1")
        self.tab_widget.addTab(self.tab2, "Tab 2")

        self.layout1 = QVBoxLayout()
        self.layout2 = QVBoxLayout()

        self.label1 = QLabel("Content of Tab 1")
        self.label2 = QLabel("Content of Tab 2")

        self.layout1.addWidget(self.label1)
        self.layout2.addWidget(self.label2)

        self.tab1.setLayout(self.layout1)
        self.tab2.setLayout(self.layout2)

        self.tab_widget.currentChanged.connect(self.fade_animation)

    def fade_animation(self, index):
        current_tab = self.tab_widget.currentWidget()
        new_tab = self.tab_widget.widget(index)

        animation1 = QPropertyAnimation(current_tab, b"windowOpacity")
        animation1.setDuration(500)
        animation1.setStartValue(1.0)
        animation1.setEndValue(0.0)
        animation1.setEasingCurve(QEasingCurve.InOutQuad)

        animation2 = QPropertyAnimation(new_tab, b"windowOpacity")
        animation2.setDuration(500)
        animation2.setStartValue(0.0)
        animation2.setEndValue(1.0)
        animation2.setEasingCurve(QEasingCurve.InOutQuad)

        animation1.start()
        animation2.start()

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