Long live Qt 4.5!

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diff --git a/doc/src/snippets/persistentindexes/mainwindow.cpp b/doc/src/snippets/persistentindexes/mainwindow.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include "mainwindow.h"
+#include "model.h"
+
+/*!
+    The main window constructor creates and populates a model with values
+    from a string list then displays the contents of the model using a
+    QListView widget.
+*/
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+{
+    QMenu *fileMenu = new QMenu(tr("&File"));
+
+    QAction *quitAction = fileMenu->addAction(tr("E&xit"));
+    quitAction->setShortcut(tr("Ctrl+Q"));
+
+    QMenu *itemsMenu = new QMenu(tr("&Items"));
+
+    insertAction = itemsMenu->addAction(tr("&Insert Item"));
+    removeAction = itemsMenu->addAction(tr("&Remove Item"));
+
+    menuBar()->addMenu(fileMenu);
+    menuBar()->addMenu(itemsMenu);
+
+    QStringList numbers;
+    numbers << tr("One") << tr("Two") << tr("Three") << tr("Four") << tr("Five")
+            << tr("Six") << tr("Seven") << tr("Eight") << tr("Nine") << tr("Ten");
+
+    model = new StringListModel(numbers);
+    QListView *view = new QListView(this);
+    view->setModel(model);
+
+    selectionModel = view->selectionModel();
+
+    connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
+    connect(insertAction, SIGNAL(triggered()), this, SLOT(insertItem()));
+    connect(removeAction, SIGNAL(triggered()), this, SLOT(removeItem()));
+    connect(selectionModel,
+            SIGNAL(currentChanged(const QModelIndex &, const QModelIndex &)),
+            this, SLOT(updateMenus(const QModelIndex &)));
+    
+    setCentralWidget(view);
+    setWindowTitle("View onto a string list model");
+}
+
+void MainWindow::insertItem()
+{
+    if (!selectionModel->currentIndex().isValid())
+        return;
+
+    QString itemText = QInputDialog::getText(this, tr("Insert Item"),
+        tr("Input text for the new item:"));
+
+    if (itemText.isNull())
+        return;
+
+    int row = selectionModel->currentIndex().row();
+
+    if (model->insertRows(row, 1))
+        model->setData(model->index(row, 0), itemText, Qt::EditRole);
+}
+
+void MainWindow::removeItem()
+{
+    if (!selectionModel->currentIndex().isValid())
+        return;
+
+    int row = selectionModel->currentIndex().row();
+
+    model->removeRows(row, 1);
+}
+
+void MainWindow::updateMenus(const QModelIndex &currentIndex)
+{
+    insertAction->setEnabled(currentIndex.isValid());
+    removeAction->setEnabled(currentIndex.isValid());
+}