如何在QGraphicsView中禁用滚动功能？

from PyQt5.QtWidgets import QGraphicsView, QGraphicsScene
from PyQt5.QtCore import Qt

class CustomGraphicsView(QGraphicsView):
    def __init__(self, parent=None):
        super().__init__(parent)
        
        # 创建场景
        self.scene = QGraphicsScene(self)
        self.setScene(self.scene)
        
        # 禁用滚动条
        self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        
    def wheelEvent(self, event):
        # 禁用滚动事件
        event.ignore()