diff -r 41300fa6a67c -r f7bc934e204c util/demos/interview/model.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util/demos/interview/model.cpp	Wed Mar 31 11:06:36 2010 +0300
@@ -0,0 +1,147 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "model.h"
+#include <QIcon>
+#include <QPixmap>
+
+Model::Model(int rows, int columns, QObject *parent)
+    : QAbstractItemModel(parent),
+      rc(rows), cc(columns),
+      tree(new QVector<Node>(rows, Node(0)))
+{
+
+}
+
+Model::~Model()
+{
+    delete tree;
+}
+
+QModelIndex Model::index(int row, int column, const QModelIndex &parent) const
+{
+    if (row < rc && row >= 0 && column < cc && column >= 0) {
+        Node *p = static_cast<Node*>(parent.internalPointer());
+        Node *n = node(row, p);
+	if (n)
+	    return createIndex(row, column, n);
+    }
+    return QModelIndex();
+}
+
+QModelIndex Model::parent(const QModelIndex &child) const
+{
+    if (child.isValid()) {
+        Node *n = static_cast<Node*>(child.internalPointer());
+        Node *p = parent(n);
+        if (p)
+            return createIndex(row(p), 0, p);
+    }
+    return QModelIndex();
+}
+
+int Model::rowCount(const QModelIndex &parent) const
+{
+    return (parent.isValid() && parent.column() != 0) ? 0 : rc;
+}
+
+int Model::columnCount(const QModelIndex &parent) const
+{
+    Q_UNUSED(parent);
+    return cc;
+}
+
+QVariant Model::data(const QModelIndex &index, int role) const
+{
+    if (!index.isValid())
+        return QVariant();
+    if (role == Qt::DisplayRole)
+	return "Item " + QString::number(index.row()) + ":" + QString::number(index.column());
+    if (role == Qt::DecorationRole) {
+        if (index.column() == 0)
+            return iconProvider.icon(QFileIconProvider::Folder);
+        return iconProvider.icon(QFileIconProvider::File);
+    }
+    return QVariant();
+}
+
+QVariant Model::headerData(int section, Qt::Orientation orientation, int role) const
+{
+    static QIcon services(QPixmap(":/images/services.png"));
+    if (role == Qt::DisplayRole)
+        return QString::number(section);
+    if (role == Qt::DecorationRole)
+        return qVariantFromValue(services);
+    return QAbstractItemModel::headerData(section, orientation, role);
+}
+
+bool Model::hasChildren(const QModelIndex &parent) const
+{
+    if (parent.isValid() && parent.column() != 0)
+        return false;
+    return rc > 0 && cc > 0;
+}
+
+Qt::ItemFlags Model::flags(const QModelIndex &index) const
+{
+    if (!index.isValid())
+        return 0;
+    return (Qt::ItemIsDragEnabled|Qt::ItemIsSelectable|Qt::ItemIsEnabled);
+}
+
+Model::Node *Model::node(int row, Node *parent) const
+{
+    if (parent && !parent->children)
+	parent->children = new QVector<Node>(rc, Node(parent));
+    QVector<Node> *v = parent ? parent->children : tree;
+    return const_cast<Node*>(&(v->at(row)));
+}
+
+Model::Node *Model::parent(Node *child) const
+{
+    return child ? child->parent : 0;
+}
+
+int Model::row(Node *node) const
+{
+     const Node *first = node->parent ? &(node->parent->children->at(0)) : &(tree->at(0));
+     return (node - first);
+}