qt 6.5.1 original

examples/widgets/tutorials/modelview/6_treeview/6_treeview.pro

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+TARGET = mv_tree
+TEMPLATE = app
+QT += widgets
+requires(qtConfig(treeview))
+SOURCES += main.cpp \
+    mainwindow.cpp
+HEADERS += mainwindow.h
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/tutorials/modelview/6_treeview
+INSTALLS += target

examples/widgets/tutorials/modelview/6_treeview/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(mv_tree LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/tutorials/modelview/6_treeview")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(mv_tree
+    main.cpp
+    mainwindow.cpp mainwindow.h
+)
+
+set_target_properties(mv_tree PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(mv_tree PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+install(TARGETS mv_tree
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/widgets/tutorials/modelview/6_treeview/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+#include "mainwindow.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    MainWindow w;
+    w.show();
+    return a.exec();
+}

examples/widgets/tutorials/modelview/6_treeview/mainwindow.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+//! [Quoting ModelView Tutorial]
+// modelview.cpp
+#include "mainwindow.h"
+
+#include <QTreeView>
+#include <QStandardItemModel>
+#include <QStandardItem>
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+    , treeView(new QTreeView(this))
+    , standardModel(new QStandardItemModel(this))
+{
+    setCentralWidget(treeView);
+
+    QList<QStandardItem *> preparedRow = prepareRow("first", "second", "third");
+    QStandardItem *item = standardModel->invisibleRootItem();
+    // adding a row to the invisible root item produces a root element
+    item->appendRow(preparedRow);
+
+    QList<QStandardItem *> secondRow = prepareRow("111", "222", "333");
+    // adding a row to an item starts a subtree
+    preparedRow.first()->appendRow(secondRow);
+
+    treeView->setModel(standardModel);
+    treeView->expandAll();
+}
+
+QList<QStandardItem *> MainWindow::prepareRow(const QString &first,
+                                              const QString &second,
+                                              const QString &third) const
+{
+    return {new QStandardItem(first),
+            new QStandardItem(second),
+            new QStandardItem(third)};
+}
+//! [Quoting ModelView Tutorial]

examples/widgets/tutorials/modelview/6_treeview/mainwindow.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+
+QT_BEGIN_NAMESPACE
+class QTreeView; // forward declarations
+class QStandardItemModel;
+class QStandardItem;
+QT_END_NAMESPACE
+
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+public:
+    explicit MainWindow(QWidget *parent = nullptr);
+
+private:
+    QList<QStandardItem *> prepareRow(const QString &first,
+                                      const QString &second,
+                                      const QString &third) const;
+
+    QTreeView *treeView;
+    QStandardItemModel *standardModel;
+};
+
+#endif // MAINWINDOW_H