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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