QT:如何在鼠标悬停QMenuBar的项目时触发“加粗”

class CustomMenuBar : public QMenuBar
{
    Q_OBJECT
public:
    explicit CustomMenuBar(QWidget *parent = nullptr);

protected:
    bool event(QEvent *event) override;
};

CustomMenuBar::CustomMenuBar(QWidget *parent) : QMenuBar(parent)
{
    // 设置菜单项的样式
    setStyleSheet("QMenuBar::item:hover { font-weight: bold; }");
}

bool CustomMenuBar::event(QEvent *event)
{
    if (event->type() == QEvent::HoverMove)
    {
        QHoverEvent *hoverEvent = static_cast<QHoverEvent *>(event);
        QAction *action = actionAt(hoverEvent->pos());
        if (action)
        {
            // 设置当前悬停菜单项的样式
            action->setFont(QFont("Arial", 10, QFont::Bold));
        }
    }
    else if (event->type() == QEvent::Leave)
    {
        // 恢复所有菜单项的样式
        QList<QAction *> actions = findChildren<QAction *>();
        foreach (QAction *action, actions)
        {
            action->setFont(QFont("Arial", 10, QFont::Normal));
        }
    }

    return QMenuBar::event(event);
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    CustomMenuBar *menuBar = new CustomMenuBar(this);
    setMenuBar(menuBar);
}