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# commands.h Example File
tools/undoframework/commands.h

     /****************************************************************************
     **
     ** Copyright (C) 2007-$THISYEAR$ $TROLLTECH$. All rights reserved.
     **
     ** This file is part of the $MODULE$ of the Qt Toolkit.
     **
     ** $TROLLTECH_DUAL_LICENSE$
     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

     #ifndef COMMANDS_H
     #define COMMANDS_H

     #include <QUndoCommand>

     #include "diagramitem.h"

     class MoveCommand : public QUndoCommand
     {
     public:
         enum { Id = 1234 };

         MoveCommand(DiagramItem *diagramItem, const QPointF &oldPos,
                     QUndoCommand *parent = 0);

         void undo();
         void redo();
         bool mergeWith(const QUndoCommand *command);
         int id() const { return Id; }

     private:
         DiagramItem *myDiagramItem;
         QPointF myOldPos;
         QPointF newPos;
     };

     class DeleteCommand : public QUndoCommand
     {
     public:
         DeleteCommand(QGraphicsScene *graphicsScene, QUndoCommand *parent = 0);

         void undo();
         void redo();

     private:
         DiagramItem *myDiagramItem;
         QGraphicsScene *myGraphicsScene;
     };

     class AddCommand : public QUndoCommand
     {
     public:
         AddCommand(DiagramItem::DiagramType addType, QGraphicsScene *graphicsScene,
                    QUndoCommand *parent = 0);

         void undo();
         void redo();

     private:
         DiagramItem *myDiagramItem;
         QGraphicsScene *myGraphicsScene;
         QPointF initialPosition;
     };

     QString createCommandString(DiagramItem *item, const QPointF &point);

     #endif