berryIStateListener.h

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/*============================================================================
 
The Medical Imaging Interaction Toolkit (MITK)
 
Copyright (c) German Cancer Research Center (DKFZ)
All rights reserved.
 
Use of this source code is governed by a 3-clause BSD license that can be
found in the LICENSE file.
 
============================================================================*/
 
 
#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_ */