commands.h Example File

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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() override;
      void redo() override;

  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() override;
      void redo() override;

  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() override;
      void redo() override;

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

  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() override;
      void redo() override;

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

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

  #endif // COMMANDS_H