vlObserver.h

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/*******************************************************************************
** Copyright (c) 1992-2025 MAK Technologies, Inc
** All rights reserved.
*******************************************************************************/
#pragma once

#include "vlList.h"
#include "vlMachineTypes.h"
#include "vlDeclNotifier.h"

#ifdef DtUSE_UTILITIES_NAMESPACE
namespace DtUSE_UTILITIES_NAMESPACE
{
#endif

class DtObserver;
class DtAbsNotifyObserver;

DtDECLARE_OBSERVER_NOTIFIER(DtObserver)

class DT_DLL_VLUTIL DtObserver
{
public:

   DtObserver();

   virtual ~DtObserver();

   DtObserver(const DtObserver& orig);

   DtObserver& operator=(const DtObserver& orig);

   virtual bool startObserving(DtObservee* toObserve);

   virtual bool stopObserving(DtObservee* observed);

   virtual bool isBeingObserved(DtObservee* object);

   virtual bool notifyFromYourObserved(
      const DtObservee* observed, 
      const DtObservee::DtWhyNotifyObserver& why);

protected:

   virtual bool pendingDeleteOfYourObserved(const DtObservee* observed);

   virtual bool deleteOfYourObserved(const DtObservee* observed);

   virtual bool removeObservedReference(const DtObservee* observed);


   bool internalStartObserving(DtObservee* toObserve);

   bool internalStopObserving(DtObservee* observed);

protected:

   DtList myObjectsAmObserving;

   DtObserverNotifier myNotifier;
};

#ifdef DtUSE_UTILITIES_NAMESPACE
} 
#endif