Game Event Management - Game Coding Complete - page 324

IEventManager::Get()->VAddListener(delegateFunc,
EvtData_Destroy_Actor::sk_EventType);

}

You also need to remember to remove it in the destructor:

RoleSystem::~RoleSystem(void)
{

// Create a delegate function object. This will have the same value as
// the one previously registered in VInit(). Another way to do this would
// be to cache the delegate object. This is a memory vs performance trade-
// off. Since the performance gain would only be during shut-down, memory
// is the better way to go here.
EventListenerDelegate delegateFunc =
MakeDelegate(this, &RoleSystem::DestroyActorDelegate);

// remove the delegate from the event manager
IEventManager::Get()->VRemoveListener(delegateFunc,
EvtData_Destroy_Actor::sk_EventType);

}

That ' s all you need to do in order to register events. Here ' s the code to send the

event:

// Instantiate the event. The event system tracks all events with smart
// pointers, so you must instantiate the event using a smart pointer.
shared_ptr<EvtData_New_Actor> pDestroyEvent(
GCC_NEW EvtData_Destroy_Actor(pActor->GetId());

// Queue the event.
IEventManager::Get()->VQueueEvent(pDestroyEvent);

// Or, if you prefer, force the event to resolve immediately with VTrigger()
// with VTriggerEvent()
IEventManager::Get()->VTriggerVTriggerEvent(pDestroyEvent);
And there you have it, a simple event system!

What Game Events Are Important?
It t

it? A game like Tetris might care about a few simple events such as “ Brick Created, ”
“

' s a little something of a cop-out, but it completely depends on your game, doesn '

A game like The Sims Medie-
val had dozens, if not hundreds, of different game events. Table 11.1 shows an exam-
ple of the kind of game events you might send in just about any game:

Brick Moved, ”“ Brick Rotated, ” and “ Brick Collision. ”