diff -r 000000000000 -r 1918ee327afb doc/src/snippets/qtreeview-dnd/dragdropmodel.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc/src/snippets/qtreeview-dnd/dragdropmodel.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,148 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (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 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of an example program for Qt.
+** EDITIONS: NOLIMITS
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include "dragdropmodel.h"
+
+DragDropModel::DragDropModel(const QStringList &strings, QObject *parent)
+    : TreeModel(strings, parent)
+{
+}
+
+bool DragDropModel::dropMimeData(const QMimeData *data,
+    Qt::DropAction action, int row, int column, const QModelIndex &parent)
+{
+    if (action == Qt::IgnoreAction)
+        return true;
+
+    if (!data->hasFormat("text/plain"))
+        return false;
+
+    int beginRow;
+
+    if (row != -1)
+        beginRow = row;
+    else if (parent.isValid())
+        beginRow = 0;
+    else
+        beginRow = rowCount(QModelIndex());
+
+    QByteArray encodedData = data->data("text/plain");
+    QDataStream stream(&encodedData, QIODevice::ReadOnly);
+    QHash<qint64, QMap<int,QHash<int,QString> > > newItems;
+
+    while (!stream.atEnd()) {
+        qint64 id;
+        int row;
+        int column;
+        QString text;
+        stream >> id >> row >> column >> text;
+        newItems[id][row][column] = text;
+    }
+    int rows = newItems.count();
+
+    insertRows(beginRow, rows, parent);
+    QMap<int,QHash<int,QString> > childItems;
+    foreach (childItems, newItems.values()) {
+        QHash<int,QString> rowItems;
+        foreach (rowItems, childItems.values()) {
+            foreach (int column, rowItems.keys()) {
+                QModelIndex idx = index(beginRow, column, parent);
+                setData(idx, rowItems[column]);
+            }
+            ++beginRow;
+        }
+    }
+
+    return true;
+}
+
+Qt::ItemFlags DragDropModel::flags(const QModelIndex &index) const
+{
+    Qt::ItemFlags defaultFlags = TreeModel::flags(index);
+
+    if (index.isValid())
+        return Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled | defaultFlags;
+    else
+        return Qt::ItemIsDropEnabled | defaultFlags;
+}
+
+QMimeData *DragDropModel::mimeData(const QModelIndexList &indexes) const
+{
+    QMimeData *mimeData = new QMimeData();
+    QByteArray encodedData;
+
+    QDataStream stream(&encodedData, QIODevice::WriteOnly);
+
+    foreach (QModelIndex index, indexes) {
+        if (index.isValid()) {
+            QString text = data(index, Qt::DisplayRole).toString();
+            stream << index.internalId() << index.row() << index.column() << text;
+        }
+    }
+
+    mimeData->setData("text/plain", encodedData);
+    return mimeData;
+}
+
+QStringList DragDropModel::mimeTypes() const
+{
+    QStringList types;
+    types << "text/plain";
+    return types;
+}
+
+Qt::DropActions DragDropModel::supportedDropActions() const
+{
+    return Qt::CopyAction | Qt::MoveAction;
+}