--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/demos/undo/commands.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,180 @@
+/****************************************************************************
+**
+** 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 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 "commands.h"
+
+static const int setShapeRectCommandId = 1;
+static const int setShapeColorCommandId = 2;
+
+/******************************************************************************
+** AddShapeCommand
+*/
+
+AddShapeCommand::AddShapeCommand(Document *doc, const Shape &shape, QUndoCommand *parent)
+    : QUndoCommand(parent)
+{
+    m_doc = doc;
+    m_shape = shape;
+}
+
+void AddShapeCommand::undo()
+{
+    m_doc->deleteShape(m_shapeName);
+}
+
+void AddShapeCommand::redo()
+{
+    // A shape only gets a name when it is inserted into a document
+    m_shapeName = m_doc->addShape(m_shape);
+    setText(QObject::tr("Add %1").arg(m_shapeName));
+}
+
+/******************************************************************************
+** RemoveShapeCommand
+*/
+
+RemoveShapeCommand::RemoveShapeCommand(Document *doc, const QString &shapeName,
+                                        QUndoCommand *parent)
+    : QUndoCommand(parent)
+{
+    setText(QObject::tr("Remove %1").arg(shapeName));
+    m_doc = doc;
+    m_shape = doc->shape(shapeName);
+    m_shapeName = shapeName;
+}
+
+void RemoveShapeCommand::undo()
+{
+    m_shapeName = m_doc->addShape(m_shape);
+}
+
+void RemoveShapeCommand::redo()
+{
+    m_doc->deleteShape(m_shapeName);
+}
+
+/******************************************************************************
+** SetShapeColorCommand
+*/
+
+SetShapeColorCommand::SetShapeColorCommand(Document *doc, const QString &shapeName,
+                                            const QColor &color, QUndoCommand *parent)
+    : QUndoCommand(parent)
+{
+    setText(QObject::tr("Set %1's color").arg(shapeName));
+
+    m_doc = doc;
+    m_shapeName = shapeName;
+    m_oldColor = doc->shape(shapeName).color();
+    m_newColor = color;
+}
+
+void SetShapeColorCommand::undo()
+{
+    m_doc->setShapeColor(m_shapeName, m_oldColor);
+}
+
+void SetShapeColorCommand::redo()
+{
+    m_doc->setShapeColor(m_shapeName, m_newColor);
+}
+
+bool SetShapeColorCommand::mergeWith(const QUndoCommand *command)
+{
+    if (command->id() != setShapeColorCommandId)
+        return false;
+
+    const SetShapeColorCommand *other = static_cast<const SetShapeColorCommand*>(command);
+    if (m_shapeName != other->m_shapeName)
+        return false;
+
+    m_newColor = other->m_newColor;
+    return true;
+}
+
+int SetShapeColorCommand::id() const
+{
+    return setShapeColorCommandId;
+}
+
+/******************************************************************************
+** SetShapeRectCommand
+*/
+
+SetShapeRectCommand::SetShapeRectCommand(Document *doc, const QString &shapeName,
+                                            const QRect &rect, QUndoCommand *parent)
+    : QUndoCommand(parent)
+{
+    setText(QObject::tr("Change %1's geometry").arg(shapeName));
+
+    m_doc = doc;
+    m_shapeName = shapeName;
+    m_oldRect = doc->shape(shapeName).rect();
+    m_newRect = rect;
+}
+
+void SetShapeRectCommand::undo()
+{
+    m_doc->setShapeRect(m_shapeName, m_oldRect);
+}
+
+void SetShapeRectCommand::redo()
+{
+    m_doc->setShapeRect(m_shapeName, m_newRect);
+}
+
+bool SetShapeRectCommand::mergeWith(const QUndoCommand *command)
+{
+    if (command->id() != setShapeRectCommandId)
+        return false;
+
+    const SetShapeRectCommand *other = static_cast<const SetShapeRectCommand*>(command);
+    if (m_shapeName != other->m_shapeName)
+        return false;
+
+    m_newRect = other->m_newRect;
+    return true;
+}
+
+int SetShapeRectCommand::id() const
+{
+    return setShapeRectCommandId;
+}