如何在使用QRubberBand时禁用右键操作？

from PyQt5.QtWidgets import QRubberBand, QApplication
from PyQt5.QtCore import Qt

class MyRubberBand(QRubberBand):
    def __init__(self, shape, parent=None):
        super().__init__(shape, parent)

    def mousePressEvent(self, event):
        if event.button() == Qt.RightButton:
            event.ignore()
            return
        super().mousePressEvent(event)

    def mouseMoveEvent(self, event):
        if event.buttons() == Qt.RightButton:
            event.ignore()
            return
        super().mouseMoveEvent(event)

    def mouseReleaseEvent(self, event):
        if event.button() == Qt.RightButton:
            event.ignore()
            return
        super().mouseReleaseEvent(event)

# 在使用QRubberBand的地方，使用MyRubberBand的实例代替QRubberBand
rubberBand = MyRubberBand(QRubberBand.Rectangle, parent)
rubberBand.show()