berryIStateListener.h

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/*===================================================================

BlueBerry Platform

Copyright (c) German Cancer Research Center,
Division of Medical and Biological Informatics.
All rights reserved.

This software is distributed WITHOUT ANY WARRANTY; without
even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE.

See LICENSE.txt or http://www.mitk.org for details.

===================================================================*/


#ifndef BERRYISTATELISTENER_H_
#define BERRYISTATELISTENER_H_

#include <org_blueberry_core_commands_Export.h>

#include "berryMessage.h"

namespace berry {

template<class T> class SmartPointer;

class Object;
class State;

struct BERRY_COMMANDS IStateListener
{

  struct Events {

    typedef Message2<const SmartPointer<State>&, const SmartPointer<Object>&> StateEvent;

    StateEvent stateChanged;

    void AddListener(IStateListener* listener);
    void RemoveListener(IStateListener* listener);

    private:
    typedef MessageDelegate2<IStateListener, const SmartPointer<State>&, const SmartPointer<Object>&> Delegate;
  };

  virtual ~IStateListener();

  virtual void HandleStateChange(const SmartPointer<State>& state,
                                 const SmartPointer<Object>& oldValue) = 0;
};


}

#endif /* BERRYISTATELISTENER_H_ */