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/*
* DNN - Data News Network
*
* by Stephane Chatty
*
* Copyright 1993-1996
* Centre d'Etudes de la Navigation Aerienne (CENA)
*
* Reactions.
*
* $Id$
* $CurLog$
*/
#ifndef IvlReaction_H_
#define IvlReaction_H_
#include "ivl/List.h"
class IvlTrigger;
class IvlEvent;
class IvlBaseReaction {
friend class IvlTrigger;
public:
enum REL_PRIORITY { isFirstPriority, isNormalPriority, isLastPriority };
protected:
IvlBaseReaction ();
IvlListOf <IvlTrigger> Triggers;
IvlListOf <IvlTrigger> Grabbed;
void Forget (IvlTrigger&);
public:
virtual ~IvlBaseReaction ();
void SubscribeTo (IvlTrigger&, REL_PRIORITY = isNormalPriority);
void UnsubscribeTo (IvlTrigger&);
void Grab (IvlTrigger&);
void Release (IvlTrigger&);
virtual void Manage (IvlEvent&);
};
typedef void (*IvlHandlingFunction) (IvlEvent&);
class IvlCallback : public IvlBaseReaction {
protected:
IvlHandlingFunction Handler;
public:
IvlCallback (IvlHandlingFunction);
~IvlCallback ();
void Manage (IvlEvent&);
};
template <class T> class IvlReactionOf : public IvlBaseReaction {
protected:
T& Object;
void (T::*Reaction) (IvlEvent&);
public:
IvlReactionOf (T& o, void (T::*r) (IvlEvent&)) : IvlBaseReaction (), Object (o), Reaction (r) {}
~IvlReactionOf () {}
void Manage (IvlEvent& ev) { (Object.*Reaction) (ev); }
};
#define SpecializedReaction(R,S) \
class R : public IvlBaseReaction { \
protected: \
S& Body; \
void (S::*React) (IvlEvent&); \
public: \
R (S& s, void (S::*sc) (IvlEvent&)) : IvlBaseReaction (), Body (s), React (sc) {} \
~R () {} \
void Manage (IvlEvent& ev) { (Body.*React) (ev); } \
};
/* Attempt at having reactions that locate the object which should be activated.
IvlObjectReactionOf should be renamed IvlReactionOf,
and IvlReactionOf should be renamed IvlBasicReactionOf */
class IvlObjectReaction : public IvlBaseReaction {
protected:
virtual void* LocateObject (IvlEvent&) = 0;
public:
IvlObjectReaction () : IvlBaseReaction () {}
~IvlObjectReaction () {}
};
template <class T> class IvlObjectReactionOf : public IvlObjectReaction {
protected:
void (T::*Reaction) (IvlEvent&);
public:
IvlObjectReactionOf (void (T::*r) (IvlEvent&)) : IvlObjectReaction (), Reaction (r) {}
~IvlObjectReactionOf () {}
void Manage (IvlEvent& ev) { T* o = (T*) LocateObject (ev); (o->*Reaction) (ev); }
};
#if 0
template <class T> class XtvReflexOf : public IvlObjectReactionOf <T> {
protected:
void* LocateObject (IvlEvent& ev) { return ((XtvEvent*)&ev)->GetTarget (); }
public:
XtvReflexOf (void (T::*r) (IvlEvent&)) : IvlObjectReactionOf <T> (r) {}
};
#endif
#endif /* IvlReaction_H_ */
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