1. 声明QList存储tab的索引

在窗口类中声明一个QList来存储历史记录，例如：

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

private:
    QList<int> m_history;
};

1. 添加历史记录

在切换tab时，将当前tab的索引加入历史记录中。为了限制历史记录最多只能存储20页，可以在添加前先判断历史记录是否已经达到最大值，如果是，则删除最早的一项。

void MyWindow::onTabChanged(int index) {
    // 添加历史记录
    m_history.append(index);
    if (m_history.size() > 20) {
        m_history.removeFirst();
    }
}

1. 响应“前进”和“后退”按钮

将“前进”和“后退”按钮的clicked信号与对应的槽函数连接，用当前tab索引更新历史记录中的索引，然后再根据所选方向（前进或后退）获取下一个或上一个索引，并将其设置为当前tab的索引。

void MyWindow::onBackwardClicked() {
    if (!m_history.isEmpty()) {
        int currentIndex = ui->tableWidget->currentIndex().column();
        m_history.append(currentIndex);
        currentIndex = m_history.takeLast();
        ui->tableWidget->setCurrentCell(0, currentIndex);
    }
}

void MyWindow::onForwardClicked() {
    if (!m_history.isEmpty()) {
        int currentIndex = ui->tableWidget->currentIndex().column();
        m_history.append(currentIndex);
        currentIndex = m_history.takeFirst();
        ui->tableWidget->setCurrentCell(0, currentIndex);
    }
}

1. 响应tab切换

将ui_QTableWidget的currentChanged信号连接到一个槽函数，用于更新历史记录。

connect(ui->tableWidget, SIGNAL(currentChanged(int,int,int,int)), this, SLOT(onTabChanged(int)));

1. 完整示例代码

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

private slots:
    void onBackwardClicked();
    void onForwardClicked();
    void onTabChanged(int index);

private:
    QList<int> m_history;
};

MyWindow::MyWindow(QWidget *parent)
    : QWidget(parent)
{
    QVBoxLayout *layout = new QVBoxLayout(this);

    // 创建ui_QTableWidget并添加表格数据
    QTableWidget *tableWidget = new QTableWidget(this);
    tableWidget->setRowCount(3);
    tableWidget->setColumnCount(3);
    tableWidget->setItem(0, 0, new QTableWidgetItem("1"));
    tableWidget->setItem(0, 1, new QTableWidgetItem("2"));
    tableWidget->setItem(0, 2, new QTableWidgetItem("3"));
    tableWidget->setItem(1, 0, new QTableWidgetItem("4"));
    tableWidget->setItem(1, 1, new QTableWidgetItem("5"));
    tableWidget->setItem(1, 2, new QTableWidgetItem("6"));
    tableWidget->setItem(2, 0, new QTableWidgetItem("7"));
    tableWidget->setItem(2, 1, new QTableWidgetItem("8"));
    tableWidget->setItem(2, 2, new QTableWidgetItem("9"));

    // 将ui_QTableWidget添加到窗口布局中
    layout->addWidget(tableWidget);

    // 添加“前进”和“后退”按钮，并连接到槽函数
    QHBoxLayout *buttonLayout = new QHBoxLayout();
    QPushButton *backwardButton = new QPushButton("后退", this);
    QPushButton *forwardButton = new QPushButton("前进", this);
    buttonLayout->addWidget(backwardButton);
    buttonLayout->addWidget(forwardButton);
    layout->addLayout(buttonLayout);
    connect(backwardButton, SIGNAL(clicked()), this, SLOT(onBackwardClicked()));
    connect(forwardButton, SIGNAL(clicked()), this, SLOT(onForwardClicked()));

    // 将ui_QTableWidget的currentChanged信号连接到onTabChanged槽函数，用于更新历史记录
    connect(tableWidget, SIGNAL(currentChanged(int,int,int,int)), this, SLOT(onTabChanged(int)));
}

void MyWindow::onBackwardClicked() {
    if (!m_history.isEmpty()) {
        int currentIndex = ui->tableWidget->currentIndex().column();
        m_history.append(currentIndex);
        currentIndex = m_history.takeLast();
        ui->tableWidget->setCurrentCell(0, currentIndex);
    }
}

void MyWindow::onForwardClicked() {
    if (!m_history.isEmpty()) {
        int currentIndex = ui->tableWidget->currentIndex().column();
        m_history.append(currentIndex);
        currentIndex = m_history.takeFirst();
        ui->tableWidget->setCurrentCell(0, currentIndex);
    }
}

void MyWindow::onTabChanged(int index) {
    // 添加历史记录
    m_history.append(index);
    if (m_history.size() > 20) {
        m_history.removeFirst();
    }
}