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#pragma once
#include "Runtime/Utilities/MemoryPool.h"
typedef void EventCallback (void* userData, void* sender, int eventType);
// Small event entry. Keep this tight.
struct EventEntry
{
void* userData;
EventEntry* next;
EventCallback* callback;
};
class EventManager
{
public:
typedef EventEntry* EventIndex;
private:
////@TODO: Memory pool has a minimum size of 32 bytes. This one fits in 12. WTF???
MemoryPool m_EventPool;
static EventManager* s_Instance;
friend EventManager& GetEventManager ();
#if DEBUGMODE
EventIndex m_InvokingEventList;
EventIndex m_InvokingEventActiveNode;
#endif
public:
EventManager ();
static void StaticInitialize ();
static void StaticDestroy ();
/// Adds an event
/// If there is already a previous event registered, it will chain them.
/// The reference to the event is the returned eventIndex
EventIndex AddEvent (EventCallback* callback, void* userData, EventIndex previousIndex);
/// Removes all events with the event index.
void RemoveEvent (EventIndex index);
/// Removes an event with a specific callback & userData
/// Returns the new event or null if no events in that index exist anymore.
/// AddEvent and RemoveEvent calls must be balanced.
EventIndex RemoveEvent (EventIndex index, EventCallback* callback, void* userData);
/// Does the event with that specific callback and userData exist?
static bool HasEvent (const EventIndex index, EventCallback* callback, const void* userData);
static void InvokeEvent (EventIndex index, void* sender, int eventType);
};
EventManager& GetEventManager ();
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