Long live Qt 4.5!

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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.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*
+    treeitem.cpp
+
+    A container for items of data supplied by the simple tree model.
+*/
+
+#include <QStringList>
+
+#include "treeitem.h"
+
+TreeItem::TreeItem(const QList<QVariant> &data, TreeItem *parent)
+{
+    parentItem = parent;
+    itemData = data;
+}
+
+TreeItem::~TreeItem()
+{
+    qDeleteAll(childItems);
+}
+
+void TreeItem::appendChild(TreeItem *item)
+{
+    childItems.append(item);
+}
+
+TreeItem *TreeItem::child(int row)
+{
+    return childItems.value(row);
+}
+
+int TreeItem::childCount() const
+{
+    return childItems.count();
+}
+
+int TreeItem::columnCount() const
+{
+    return itemData.count();
+}
+
+QVariant TreeItem::data(int column) const
+{
+    return itemData.value(column);
+}
+
+bool TreeItem::insertChild(int row, TreeItem *item)
+{
+    if (row < 0 || row > childItems.count())
+        return false;
+
+    childItems.insert(row, item);
+    return true;
+}
+
+TreeItem *TreeItem::parent()
+{
+    return parentItem;
+}
+
+bool TreeItem::removeChild(int row)
+{
+    if (row < 0 || row >= childItems.count())
+        return false;
+
+    delete childItems.takeAt(row);
+    return true;
+}
+
+int TreeItem::row() const
+{
+    if (parentItem)
+        return parentItem->childItems.indexOf(const_cast<TreeItem*>(this));
+
+    return 0;
+}
+
+bool TreeItem::setData(int column, const QVariant &data)
+{
+    if (column < 0 || column >= itemData.count())
+        return false;
+
+    itemData.replace(column, data);
+    return true;
+}