Qt 4.8: commands.h Example File (tools/undoframework/commands.h)

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# commands.h Example File

tools/undoframework/commands.h

     /****************************************************************************
     **
     ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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     #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);
         ~AddCommand();

         void undo();
         void redo();

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

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

     #endif