--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/demos/undo/document.h	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,125 @@
+/****************************************************************************
+**
+** 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef DOCUMENT_H
+#define DOCUMENT_H
+
+#include <QWidget>
+
+QT_FORWARD_DECLARE_CLASS(QUndoStack)
+QT_FORWARD_DECLARE_CLASS(QTextStream)
+
+class Shape
+{
+public:
+    enum Type { Rectangle, Circle, Triangle };
+
+    Shape(Type type = Rectangle, const QColor &color = Qt::red, const QRect &rect = QRect());
+
+    Type type() const;
+    QString name() const;
+    QRect rect() const;
+    QRect resizeHandle() const;
+    QColor color() const;
+
+    static QString typeToString(Type type);
+    static Type stringToType(const QString &s, bool *ok = 0);
+
+    static const QSize minSize;
+
+private:
+    Type m_type;
+    QRect m_rect;
+    QColor m_color;
+    QString m_name;
+
+    friend class Document;
+};
+
+class Document : public QWidget
+{
+    Q_OBJECT
+
+public:
+    Document(QWidget *parent = 0);
+
+    QString addShape(const Shape &shape);
+    void deleteShape(const QString &shapeName);
+    Shape shape(const QString &shapeName) const;
+    QString currentShapeName() const;
+
+    void setShapeRect(const QString &shapeName, const QRect &rect);
+    void setShapeColor(const QString &shapeName, const QColor &color);
+
+    bool load(QTextStream &stream);
+    void save(QTextStream &stream);
+
+    QString fileName() const;
+    void setFileName(const QString &fileName);
+
+    QUndoStack *undoStack() const;
+
+signals:
+    void currentShapeChanged(const QString &shapeName);
+
+protected:
+    void paintEvent(QPaintEvent *event);
+    void mousePressEvent(QMouseEvent *event);
+    void mouseReleaseEvent(QMouseEvent *event);
+    void mouseMoveEvent(QMouseEvent *event);
+
+private:
+    void setCurrentShape(int index);
+    int indexOf(const QString &shapeName) const;
+    int indexAt(const QPoint &pos) const;
+    QString uniqueName(const QString &name) const;
+
+    QList<Shape> m_shapeList;
+    int m_currentIndex;
+    int m_mousePressIndex;
+    QPoint m_mousePressOffset;
+    bool m_resizeHandlePressed;
+    QString m_fileName;
+
+    QUndoStack *m_undoStack;
+};
+
+#endif // DOCUMENT_H