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diff --git a/examples/itemviews/editabletreemodel/treemodel.cpp b/examples/itemviews/editabletreemodel/treemodel.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 examples 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 "treeitem.h"
+#include "treemodel.h"
+
+//! [0]
+TreeModel::TreeModel(const QStringList &headers, const QString &data,
+                     QObject *parent)
+    : QAbstractItemModel(parent)
+{
+    QVector<QVariant> rootData;
+    foreach (QString header, headers)
+        rootData << header;
+
+    rootItem = new TreeItem(rootData);
+    setupModelData(data.split(QString("\n")), rootItem);
+}
+//! [0]
+
+//! [1]
+TreeModel::~TreeModel()
+{
+    delete rootItem;
+}
+//! [1]
+
+//! [2]
+int TreeModel::columnCount(const QModelIndex & /* parent */) const
+{
+    return rootItem->columnCount();
+}
+//! [2]
+
+QVariant TreeModel::data(const QModelIndex &index, int role) const
+{
+    if (!index.isValid())
+        return QVariant();
+
+    if (role != Qt::DisplayRole && role != Qt::EditRole)
+        return QVariant();
+
+    TreeItem *item = getItem(index);
+
+    return item->data(index.column());
+}
+
+//! [3]
+Qt::ItemFlags TreeModel::flags(const QModelIndex &index) const
+{
+    if (!index.isValid())
+        return 0;
+
+    return Qt::ItemIsEditable | Qt::ItemIsEnabled | Qt::ItemIsSelectable;
+}
+//! [3]
+
+//! [4]
+TreeItem *TreeModel::getItem(const QModelIndex &index) const
+{
+    if (index.isValid()) {
+        TreeItem *item = static_cast<TreeItem*>(index.internalPointer());
+        if (item) return item;
+    }
+    return rootItem;
+}
+//! [4]
+
+QVariant TreeModel::headerData(int section, Qt::Orientation orientation,
+                               int role) const
+{
+    if (orientation == Qt::Horizontal && role == Qt::DisplayRole)
+        return rootItem->data(section);
+
+    return QVariant();
+}
+
+//! [5]
+QModelIndex TreeModel::index(int row, int column, const QModelIndex &parent) const
+{
+    if (parent.isValid() && parent.column() != 0)
+        return QModelIndex();
+//! [5]
+
+//! [6]
+    TreeItem *parentItem = getItem(parent);
+
+    TreeItem *childItem = parentItem->child(row);
+    if (childItem)
+        return createIndex(row, column, childItem);
+    else
+        return QModelIndex();
+}
+//! [6]
+
+bool TreeModel::insertColumns(int position, int columns, const QModelIndex &parent)
+{
+    bool success;
+
+    beginInsertColumns(parent, position, position + columns - 1);
+    success = rootItem->insertColumns(position, columns);
+    endInsertColumns();
+
+    return success;
+}
+
+bool TreeModel::insertRows(int position, int rows, const QModelIndex &parent)
+{
+    TreeItem *parentItem = getItem(parent);
+    bool success;
+
+    beginInsertRows(parent, position, position + rows - 1);
+    success = parentItem->insertChildren(position, rows, rootItem->columnCount());
+    endInsertRows();
+
+    return success;
+}
+
+//! [7]
+QModelIndex TreeModel::parent(const QModelIndex &index) const
+{
+    if (!index.isValid())
+        return QModelIndex();
+
+    TreeItem *childItem = getItem(index);
+    TreeItem *parentItem = childItem->parent();
+
+    if (parentItem == rootItem)
+        return QModelIndex();
+
+    return createIndex(parentItem->childNumber(), 0, parentItem);
+}
+//! [7]
+
+bool TreeModel::removeColumns(int position, int columns, const QModelIndex &parent)
+{
+    bool success;
+
+    beginRemoveColumns(parent, position, position + columns - 1);
+    success = rootItem->removeColumns(position, columns);
+    endRemoveColumns();
+
+    if (rootItem->columnCount() == 0)
+        removeRows(0, rowCount());
+
+    return success;
+}
+
+bool TreeModel::removeRows(int position, int rows, const QModelIndex &parent)
+{
+    TreeItem *parentItem = getItem(parent);
+    bool success = true;
+
+    beginRemoveRows(parent, position, position + rows - 1);
+    success = parentItem->removeChildren(position, rows);
+    endRemoveRows();
+
+    return success;
+}
+
+//! [8]
+int TreeModel::rowCount(const QModelIndex &parent) const
+{
+    TreeItem *parentItem = getItem(parent);
+
+    return parentItem->childCount();
+}
+//! [8]
+
+bool TreeModel::setData(const QModelIndex &index, const QVariant &value,
+                        int role)
+{
+    if (role != Qt::EditRole)
+        return false;
+
+    TreeItem *item = getItem(index);
+    bool result = item->setData(index.column(), value);
+
+    if (result)
+        emit dataChanged(index, index);
+
+    return result;
+}
+
+bool TreeModel::setHeaderData(int section, Qt::Orientation orientation,
+                              const QVariant &value, int role)
+{
+    if (role != Qt::EditRole || orientation != Qt::Horizontal)
+        return false;
+
+    bool result = rootItem->setData(section, value);
+
+    if (result)
+        emit headerDataChanged(orientation, section, section);
+
+    return result;
+}
+
+void TreeModel::setupModelData(const QStringList &lines, TreeItem *parent)
+{
+    QList<TreeItem*> parents;
+    QList<int> indentations;
+    parents << parent;
+    indentations << 0;
+
+    int number = 0;
+
+    while (number < lines.count()) {
+        int position = 0;
+        while (position < lines[number].length()) {
+            if (lines[number].mid(position, 1) != " ")
+                break;
+            position++;
+        }
+
+        QString lineData = lines[number].mid(position).trimmed();
+
+        if (!lineData.isEmpty()) {
+            // Read the column data from the rest of the line.
+            QStringList columnStrings = lineData.split("\t", QString::SkipEmptyParts);
+            QVector<QVariant> columnData;
+            for (int column = 0; column < columnStrings.count(); ++column)
+                columnData << columnStrings[column];
+
+            if (position > indentations.last()) {
+                // The last child of the current parent is now the new parent
+                // unless the current parent has no children.
+
+                if (parents.last()->childCount() > 0) {
+                    parents << parents.last()->child(parents.last()->childCount()-1);
+                    indentations << position;
+                }
+            } else {
+                while (position < indentations.last() && parents.count() > 0) {
+                    parents.pop_back();
+                    indentations.pop_back();
+                }
+            }
+
+            // Append a new item to the current parent's list of children.
+            TreeItem *parent = parents.last();
+            parent->insertChildren(parent->childCount(), 1, rootItem->columnCount());
+            for (int column = 0; column < columnData.size(); ++column)
+                parent->child(parent->childCount() - 1)->setData(column, columnData[column]);
+        }
+
+        number++;
+    }
+}