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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include <QtGui>
++
++ #include "mainwindow.h"
++ #include "dragdropmodel.h"
++
++ MainWindow::MainWindow()
++ {
++ QMenu *fileMenu = new QMenu(tr("&File"));
++
++ QAction *quitAction = fileMenu->addAction(tr("E&xit"));
++ quitAction->setShortcut(tr("Ctrl+Q"));
++
++ menuBar()->addMenu(fileMenu);
++
++ // For convenient quoting:
++ QTreeView *treeView = new QTreeView(this);
++ treeView->setSelectionMode(QAbstractItemView::ExtendedSelection);
++ treeView->setDragEnabled(true);
++ treeView->setAcceptDrops(true);
++ treeView->setDropIndicatorShown(true);
++
++ this->treeView = treeView;
++
++ connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
++
++ setupItems();
++
++ setCentralWidget(treeView);
++ setWindowTitle(tr("Tree View"));
++ }
++
++ void MainWindow::setupItems()
++ {
++ QStringList items;
++ items << tr("Widgets\tUser interface objects used to create GUI applications.")
++ << tr(" QWidget\tThe basic building block for all other widgets.")
++ << tr(" QDialog\tThe base class for dialog windows.")
++ << tr("Tools\tUtilities and applications for Qt developers.")
++ << tr(" Qt Widgets Designer\tA GUI form designer for Qt applications.")
++ << tr(" Qt Assistant\tA documentation browser for Qt documentation.");
++
++ DragDropModel *model = new DragDropModel(items, this);
++ QModelIndex index = model->index(0, 0, QModelIndex());
++ model->insertRows(2, 3, index);
++ index = model->index(0, 0, QModelIndex());
++ index = model->index(2, 0, index);
++ model->setData(index, QVariant("QFrame"));
++ model->removeRows(3, 2, index.parent());
++ treeView->setModel(model);
++ }