ALLEGRO_EVENT_SOURCE - Allegro 5 API
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#include <allegro5/allegro.h>
typedef struct ALLEGRO_EVENT_SOURCE ALLEGRO_EVENT_SOURCE;
An event source is any object which can generate events. For example, an
ALLEGRO_DISPLAY can generate events, and you can get the ALLEGRO_EVENT_SOURCE
pointer from an ALLEGRO_DISPLAY with al_get_display_event_source(3alleg5).
You may create your own “user” event sources that emit custom
events.
ALLEGRO_EVENT(3alleg5), al_init_user_event_source(3alleg5),
al_emit_user_event(3alleg5)