Observable.h

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#ifndef ANA_OBSERVER_OBSERVABLE_H
#define ANA_OBSERVER_OBSERVABLE_H
 
 
//--- header files ------------------------------------------------------------
 
#include <cartobase/smart/sharedptr.h>
#include <set>
#include <string>
 
 
namespace anatomist
{
  //--- forward declarations --------------------------------------------------
 
  class Observer;
 
 
  //--- class declarations ----------------------------------------------------
 
  class Observable : virtual public carto::SharedObject
  {
  public:
    Observable();
 
    virtual ~Observable();
 
 
    void addObserver(Observer* observer);
 
    void deleteObserver(Observer* observer);
 
    void deleteObservers();
 
    int countObservers() const;
 
    virtual void notifyObservers(void* arg = 0);
 
    virtual void notifyUnregisterObservers();
 
 
 
    bool hasChanged() const;
    bool obsHasChanged( int ) const;
    bool obsHasChanged( const std::string & ) const;
 
    void setChanged() const;
 
 
  protected:
    void clearChanged() const;
 
    void obsSetChanged( int, bool = true ) const;
    void obsSetChanged( const std::string &, bool = true ) const;
 
 
  private:
    struct Private;
 
    mutable bool _changed;
    mutable bool _updating;
    Private     *d;
 
    std::set<Observer*> _observers;
  };
 
 
  //--- inline methods --------------------------------------------------------
 
  inline
  bool
  Observable::hasChanged() const
  {
    return _changed;
  }
 
 
  inline
  void
  Observable::setChanged() const
  {
    _changed = true;
  }
 
}
 
 
#endif