如何在qgraphicsview上同步滑块？

QScrollBar *scrollBar = new QScrollBar(Qt::Vertical, this);  // 创建垂直滑块
QGraphicsView *graphicsView = new QGraphicsView(this);  // 创建图形视图

// 设置滑块初始值
scrollBar->setValue(0);

// 获取滚动条对象
QScrollBar *verticalScrollBar = graphicsView->verticalScrollBar();
QScrollBar *horizontalScrollBar = graphicsView->horizontalScrollBar();

// 连接信号与槽
connect(scrollBar, &QScrollBar::valueChanged, graphicsView, &QGraphicsView::setVerticalScrollBar);
connect(scrollBar, &QScrollBar::valueChanged, graphicsView, &QGraphicsView::setHorizontalScrollBar);

// 槽函数中实现滑块值的同步更新
void QGraphicsView::setVerticalScrollBar(int value) {
    verticalScrollBar->setValue(value);
}

void QGraphicsView::setHorizontalScrollBar(int value) {
    horizontalScrollBar->setValue(value);
}