/*
 *	DNN - Data News Network
 *
 *	by Stephane Chatty
 *
 *	Copyright 1993-1994
 *	Centre d'Etudes de la Navigation Aerienne (CENA)
 *
 *	Event triggers.
 *
 *	$Id$
 *	$CurLog$
 */

#ifndef DnnTrigger_H_
#define DnnTrigger_H_

#ifdef __GNUG__
#pragma interface
#endif

#include "cplus_bugs.h"
#include "ccu/List.h"

class DnnReaction;
class DnnWindow;
class DnnEvent;

class DnnTrigger {
friend	class	DnnBaseReaction;

private:
		DnnTrigger (const DnnTrigger&);
	DnnTrigger&	operator = (const DnnTrigger&);

protected:
	CcuListOf <DnnBaseReaction>	Subscribers;
	CcuListOf <DnnBaseReaction>	Grabs;
	void	Subscribe (DnnBaseReaction&);
	void	Unsubscribe (DnnBaseReaction&);
	void	Grab (DnnBaseReaction&);
	void	Release (DnnBaseReaction&);

public:
		DnnTrigger ();
		~DnnTrigger ();
inline	const CcuListOf <DnnBaseReaction>&	GetSubscribers () const	{ return Subscribers; }
	void	Dispatch (DnnEvent&);
};

#endif	/* DnnTrigger_H_ */