QT，C++：信号和插槽如何与listWidgetItems一起工作？

// 发出信号的对象
class Sender : public QObject
{
    Q_OBJECT
public:
    explicit Sender(QObject *parent = nullptr) : QObject(parent) {}

signals:
    void itemSelected(QListWidgetItem *item); // 定义一个信号函数，传递选中的listWidgetItem

public slots:
    void onItemSelected() {
        QListWidgetItem *item = listWidget->currentItem(); // 获取当前选中的listWidgetItem
        emit itemSelected(item); // 发出信号，传递选中的listWidgetItem
    }

private:
    QListWidget *listWidget; // listWidget对象
};

// 接收信号的对象
class Receiver : public QObject
{
    Q_OBJECT
public:
    explicit Receiver(QObject *parent = nullptr) : QObject(parent) {}

public slots:
    void onItemSelectionChanged(QListWidgetItem *item) {
        // 处理选中的listWidgetItem
    }
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    Sender sender;
    Receiver receiver;

    // 连接信号和插槽
    QObject::connect(&sender, &Sender::itemSelected, &receiver, &Receiver::onItemSelectionChanged);

    // 其他初始化和显示窗口的代码...

    return app.exec();
}