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    41 

    42 #ifndef COMMANDS_H

    43 #define COMMANDS_H

    44 

    45 #include <QUndoCommand>

    46 

    47 #include "diagramitem.h"

    48 

    49 //! [0]

    50 class MoveCommand : public QUndoCommand

    51 {

    52 public:

    53     enum { Id = 1234 };

    54 

    55     MoveCommand(DiagramItem *diagramItem, const QPointF &oldPos,

    56                 QUndoCommand *parent = 0);

    57 

    58     void undo();

    59     void redo();

    60     bool mergeWith(const QUndoCommand *command);

    61     int id() const { return Id; }

    62 

    63 private:

    64     DiagramItem *myDiagramItem;

    65     QPointF myOldPos;

    66     QPointF newPos;

    67 };

    68 //! [0]

    69 

    70 //! [1]

    71 class DeleteCommand : public QUndoCommand

    72 {

    73 public:

    74     DeleteCommand(QGraphicsScene *graphicsScene, QUndoCommand *parent = 0);

    75 

    76     void undo();

    77     void redo();

    78 

    79 private:

    80     DiagramItem *myDiagramItem;

    81     QGraphicsScene *myGraphicsScene;

    82 };

    83 //! [1]

    84 

    85 //! [2]

    86 class AddCommand : public QUndoCommand

    87 {

    88 public:

    89     AddCommand(DiagramItem::DiagramType addType, QGraphicsScene *graphicsScene,

    90                QUndoCommand *parent = 0);

    91 

    92     void undo();

    93     void redo();

    94 

    95 private:

    96     DiagramItem *myDiagramItem;

    97     QGraphicsScene *myGraphicsScene;

    98     QPointF initialPosition;

    99 };

   100 //! [2]

   101 

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

   103 

   104 #endif