QCheckBox:如何区分用户引发的状态更改和以编程方式进行的更改？

from PyQt5.QtWidgets import QApplication, QCheckBox
from PyQt5.QtCore import Qt, pyqtSignal

class CustomCheckBox(QCheckBox):
    userChanged = pyqtSignal()
    programmaticChange = pyqtSignal()

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.stateChanged.connect(self.handleStateChanged)

    def handleStateChanged(self, state):
        if self.isUserChange():
            self.userChanged.emit()
        else:
            self.programmaticChange.emit()

    def isUserChange(self):
        return self.hasFocus() and self.hasMouseTracking() and self.underMouse()

if __name__ == '__main__':
    app = QApplication([])
    checkbox = CustomCheckBox("Click me")
    checkbox.userChanged.connect(lambda: print("User changed the checkbox"))
    checkbox.programmaticChange.connect(lambda: print("Programmatic change"))

    def programmaticChange():
        checkbox.blockSignals(True)
        checkbox.setChecked(not checkbox.isChecked())
        checkbox.blockSignals(False)

    checkbox.show()
    app.exec_()