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#pragma once
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
typedef uint32_t EventID;
typedef uint32_t ListenerID;
typedef enum {
EVENT_PRIORITY_LOW,
EVENT_PRIORITY_NORMAL,
EVENT_PRIORITY_HIGH,
} EventPriority;
typedef struct {
bool cancelled;
} IEvent;
typedef void (*EventCallback)(IEvent*);
typedef struct {
EventPriority priority;
EventCallback function;
} EventListener;
#ifdef INIT_EVENT_IDS
#define DECLARE_EVENT(eventName) \
uint32_t eventName##ID = -1;
#else
#define DECLARE_EVENT(eventName) \
extern uint32_t eventName##ID;
#endif
#define DEFINE_EVENT(eventName, ...) \
typedef struct { \
IEvent event; \
__VA_ARGS__ \
} eventName; \
\
DECLARE_EVENT(eventName)
#define CALL_EVENT(eventType, ...) \
eventType eventType##_ = { {false}, __VA_ARGS__ }; \
EventSystem_CallEvent(eventType##ID, &eventType##_);
#define CALL_CANCELLABLE_EVENT(eventType, ...) \
eventType eventType##_ = { {false}, __VA_ARGS__ }; \
EventSystem_CallEvent(eventType##ID, &eventType##_); \
if (!eventType##_.event.cancelled)
#define REGISTER_EVENT(eventType) \
eventType##ID = EventSystem_RegisterEvent();
#define REGISTER_LISTENER(eventType, callback, priority) \
EventSystem_RegisterListener(eventType##ID, callback, priority);
#ifdef __cplusplus
#include <array>
#include <vector>
#include <unordered_map>
class EventSystem {
public:
static EventSystem* Instance;
EventID RegisterEvent();
ListenerID RegisterListener(EventID id, EventCallback callback, EventPriority priority = EVENT_PRIORITY_NORMAL);
void UnregisterListener(EventID ev, ListenerID id);
void CallEvent(EventID id, IEvent* event);
private:
std::unordered_map<EventID, std::vector<EventListener>> mEventListeners;
EventID mInternalEventID = 0;
};
#else
extern EventID EventSystem_RegisterEvent();
extern ListenerID EventSystem_RegisterListener(EventID id, EventCallback callback, EventPriority priority);
extern void EventSystem_UnregisterListener(EventID ev, ListenerID id);
extern void EventSystem_CallEvent(EventID id, void* event);
#endif
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