qt QTreeView的简单使用（多级子节点）

#include "mainwindow.h" #include "ui_mainwindow.h" 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()); }