qt QTreeView的简单使用（多级子节点）

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    setWindowTitle("QTreeView的简单使用");

    model = new QStandardItemModel;
    model->setHorizontalHeaderLabels(QStringList() << "left" << "right");

    ui->treeView->setModel(model);
    ui->treeView->header()->setSectionResizeMode(QHeaderView::Stretch);
    ui->treeView->header()->setDefaultAlignment(Qt::AlignHCenter);

    connect(ui->treeView, &QTreeView::clicked, this, &MainWindow::clicked);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_clicked()
{
    int index = model->rowCount();
    QList<QStandardItem *> topList;
    //链表容器添加顶级节点
    topList << new QStandardItem(QString("顶级节点:%1-left").arg(index + 1))
            << new QStandardItem(QString("顶级节点:%1-right").arg(index + 1));


    topList[0]->setData(-1, Qt::UserRole + 1); //设置父节点行，当值为-1时则当前为顶级节点
    topList[1]->setData(-1, Qt::UserRole + 1);
    //添加顶级节点
    model->appendRow(topList);
}


void MainWindow::on_pushButton_2_clicked()
{
    //获取当前行列
    QModelIndex curIndex = ui->treeView->currentIndex();
    int row = curIndex.row();
    int column = curIndex.column();
    int parentRow = curIndex.data(Qt::UserRole + 1).toInt();

    //当前行列值包含-1值或当前节点非顶级节点时返回
    if( -1 == row || -1 == column)
    {
        return;
    }


    QStandardItem *item = model->itemFromIndex(curIndex);

    QList<QStandardItem *> childList;
    childList << new QStandardItem(QString("子节点:%1-left").arg(item->rowCount()))
              << new QStandardItem(QString("子节点:%1-right").arg(item->rowCount()));
    //设置item的data
    childList[0]->setData(row, Qt::UserRole + 1);
    childList[1]->setData(row, Qt::UserRole + 1);
    //添加子节点
    item->appendRow(childList);
}


void MainWindow::on_pushButton_3_clicked()
{
    //获取当前行列
    QModelIndex curIndex = ui->treeView->currentIndex();
    int row = curIndex.row();
    int column = curIndex.column();

    //当前行列值包含-1值或当前节点非顶级节点时返回
    if( -1 == row || -1 == column)
    {
        return;
    }

    QStandardItem *item = model->itemFromIndex(curIndex);
    if(item)
    {
        QStandardItem *parentItem = item->parent();
        if(parentItem)
            parentItem->removeRow(row);
        else
            model->removeRow(row);
    }
}

void MainWindow::clicked()
{
    //获取当前行列
    QModelIndex curIndex = ui->treeView->currentIndex();
    int row = curIndex.row();
    int column = curIndex.column();

    //当前位置包含-1值返回
    if( -1 == row || -1 == column)
    {
        return;
    }

    ui->statusbar->showMessage(curIndex.data().toString());
}

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运行效果如下：

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