undo.h

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#ifndef UNDO_H_
#define UNDO_H_

class CAUndoCommand;
class CADocument;

#include <QHash>
#include <QList>

class CAUndo {
public:
        CAUndo();
        virtual ~CAUndo();

        bool canUndo( CADocument* );
        bool canRedo( CADocument* );
        void undo( CADocument* );
        void redo( CADocument* );
        inline bool containsUndoStack( CADocument *d ) { return _undoStack.contains(d); }
        void createUndoStack( CADocument *d );
        inline QList<CAUndoCommand*> *undoStack( CADocument* d ) { return _undoStack[d]; }
        inline int& undoIndex( CADocument* d ) { return _undoIndex[undoStack(d)]; }
        inline void removeUndoStack( CADocument *d ) { _undoStack.remove(d); }
        void deleteUndoStack( CADocument *doc );
        void createUndoCommand( CADocument *d, QString text );
        void pushUndoCommand();
        CAUndoCommand *undoCommand( CADocument *d );
        CAUndoCommand *redoCommand( CADocument *d );
        void updateLastUndoCommand( CAUndoCommand *c );
        void changeDocument( CADocument*, CADocument* );
        QList<CADocument*> getAllDocuments( CADocument *d );
private:
        void clearUndoCommand();
        CAUndoCommand *_undoCommand; // current undo command created to be put on the undo stack

        QHash< CADocument*, QList<CAUndoCommand*>* > _undoStack;
        QHash< QList<CAUndoCommand*>*, int >         _undoIndex;
};

#endif /* UNDO_H_ */