Add example usage

src/main.c

@@ -1,102 +1,103 @@
 #include "event_system.h"
 #include <stdio.h>
 
-#define ARR_LEN(ARR) (sizeof(ARR) / sizeof(ARR[0]))
+typedef struct window_event WindowEvent;
+typedef struct keyboard_event KeyboardEvent;
+typedef struct mouse_event MouseEvent;
 
-void callback(void *data);
-void callback1(void *data);
-void callback2(void *data);
-void callback3(void *data);
-void callback4(void *data);
-void callback5(void *data);
+struct window_event {
+  int window_width;
+  int window_height;
+};
+
+struct keyboard_event {
+  int key;
+};
+
+struct mouse_event {
+  int x;
+  int y;
+};
+
+enum event_ids {
+  EVENT_WINDOW,
+  EVENT_KEYBOARD,
+  EVENT_MOUSE,
+
+  COUNT_EVENTS,
+};
+
+void window_event_handler(void *data);
+void keyboard_event_handler(void *data);
+void mouse_event_handler(void *data);
 
 int main(void) {
-  EventSystem es = es_init(16, 64);
+  Event         events   [COUNT_EVENTS] = {0};
+  EventListener listeners[COUNT_EVENTS] = {0};
+  EventCallback callbacks[COUNT_EVENTS] = {window_event_handler, keyboard_event_handler, mouse_event_handler};
 
-  for (int i = 0; i < 40; ++i) {
-    Event ev = es_register_event(es);
-    printf("%lu\n", ev.id);
+  EventSystem es = es_init(COUNT_EVENTS, 64);
+
+  for (int i = 0; i < COUNT_EVENTS; ++i) {
+    events[i]    = es_register_event(es);
+    listeners[i] = es_add_event_listener(es, events[i], callbacks[i]);
   }
 
-  printf("\n");
+  WindowEvent   window_event   = { .window_width = 1280, .window_height = 720 };
+  KeyboardEvent keyboard_event = { .key = 120 };
+  MouseEvent    mouse_event    = { .x = 628, .y = 154 };
 
-  unsigned int count = 6;
+  printf("FROM MAIN\n");
+  printf("    WIDTH: %d, HEIGHT: %d\n", window_event.window_width, window_event.window_height);
+  es_emit_event(es, events[EVENT_WINDOW],   (void *)&window_event);
 
-  for (int i = 0; i < count; ++i) {
-    es_deregister_event(es, (Event){ .id = (i + 1) * 2 });
+  printf("FROM MAIN\n");
+  printf("    KEY: %d\n", keyboard_event.key);
+  es_emit_event(es, events[EVENT_KEYBOARD], (void *)&keyboard_event);
+
+  printf("FROM MAIN\n");
+  printf("    X: %d, Y: %d\n", mouse_event.x, mouse_event.y);
+  es_emit_event(es, events[EVENT_MOUSE],    (void *)&mouse_event);
+
+  for (int i = 0; i < COUNT_EVENTS; ++i) {
+    es_remove_event_listener(es, listeners[i]);
+    es_deregister_event(es, events[i]);
   }
 
-  for (int i = 0; i < count; ++i) {
-    Event ev = es_register_event(es);
-    printf("%lu\n", ev.id);
-  }
-
-  printf("\n");
-
-  es_deregister_event(es, (Event){ .id = 10 });
-  Event ev = es_register_event(es);
-  for (int i = 0; i < 10; ++i) {
-    EventListener listener = es_add_event_listener(es, ev, callback);
-    printf("Event: %lu, ID: %lu\n", listener.event.id, listener.id);
-  }
-
-  printf("\n");
-
-  for (int i = 5; i < 8; ++i) {
-    es_remove_event_listener(es, (EventListener){ .event = ev, .id = i });
-  }
-
-  for (int i = 0; i < 3; ++i) {
-    EventListener listener = es_add_event_listener(es, ev, callback);
-    printf("Event: %lu, ID: %lu\n", listener.event.id, listener.id);
-  }
-
-  printf("\n");
-
-  EventCallback callbacks[] = {callback1, callback2, callback3, callback4, callback5};
-  EventListener listeners[ARR_LEN(callbacks)] = {0};
-  Event ev_with_callbacks = (Event){ .id = 20 };
-  for (int i = 0; i < ARR_LEN(callbacks); ++i) {
-    listeners[i] = es_add_event_listener(es, ev_with_callbacks, callbacks[i]);
-  }
-
-  es_emit_event(es, ev_with_callbacks, (void *)0);
-
-  printf("\n");
-
-  es_remove_event_listener(es, listeners[2]);
-
-  es_emit_event(es, ev_with_callbacks, (void *)0);
-
-  printf("\n");
-
-  printf("SYSTEM: %lu\n", es.id);
   es_deinit(&es);
-  printf("SYSTEM: %lu\n", es.id);
 
   return 0;
 }
 
-void callback(void *data) {
-  return;
+void window_event_handler(void *data) {
+  if (!data) {
+    return;
+  }
+
+  WindowEvent *ev = (WindowEvent *)data;
+
+  printf("FROM CALLBACK\n");
+  printf("    WIDTH: %d, HEIGHT: %d\n\n", ev->window_width, ev->window_height);
 }
 
-void callback1(void *data) {
-  printf("Hello from callback1\n");
+void keyboard_event_handler(void *data) {
+  if (!data) {
+    return;
+  }
+
+  KeyboardEvent *ev = (KeyboardEvent *)data;
+
+  printf("FROM CALLBACK\n");
+  printf("    KEY: %d\n\n", ev->key);
 }
 
-void callback2(void *data) {
-  printf("Hello from callback2\n");
-}
+void mouse_event_handler(void *data) {
+  if (!data) {
+    return;
+  }
 
-void callback3(void *data) {
-  printf("Hello from callback3\n");
-}
+  MouseEvent *ev = (MouseEvent *)data;
 
-void callback4(void *data) {
-  printf("Hello from callback4\n");
-}
-
-void callback5(void *data) {
-  printf("Hello from callback5\n");
+  printf("FROM CALLBACK\n");
+  printf("    X: %d, Y: %d\n\n", ev->x, ev->y);
 }