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# commands.h Example File
demos/undo/commands.h

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     #ifndef COMMANDS_H
     #define COMMANDS_H

     #include <QUndoCommand>
     #include "document.h"

     class AddShapeCommand : public QUndoCommand
     {
     public:
         AddShapeCommand(Document *doc, const Shape &shape, QUndoCommand *parent = 0);
         void undo();
         void redo();

     private:
         Document *m_doc;
         Shape m_shape;
         QString m_shapeName;
     };

     class RemoveShapeCommand : public QUndoCommand
     {
     public:
         RemoveShapeCommand(Document *doc, const QString &shapeName, QUndoCommand *parent = 0);
         void undo();
         void redo();

     private:
         Document *m_doc;
         Shape m_shape;
         QString m_shapeName;
     };

     class SetShapeColorCommand : public QUndoCommand
     {
     public:
         SetShapeColorCommand(Document *doc, const QString &shapeName, const QColor &color,
                                 QUndoCommand *parent = 0);

         void undo();
         void redo();

         bool mergeWith(const QUndoCommand *command);
         int id() const;

     private:
         Document *m_doc;
         QString m_shapeName;
         QColor m_oldColor;
         QColor m_newColor;
     };

     class SetShapeRectCommand : public QUndoCommand
     {
     public:
         SetShapeRectCommand(Document *doc, const QString &shapeName, const QRect &rect,
                                 QUndoCommand *parent = 0);

         void undo();
         void redo();

         bool mergeWith(const QUndoCommand *command);
         int id() const;

     private:
         Document *m_doc;
         QString m_shapeName;
         QRect m_oldRect;
         QRect m_newRect;
     };

     #endif // COMMANDS_H