Check for the existence of a certain event type in the event queue.
SDL_bool SDL_HasEvent(Uint32 type);
the type of event to be queried; see SDL_EventType for details
Returns SDL_TRUE if events matching
type are present, or SDL_FALSE if events matching
type are not present.
If you need to check for a range of event types, use SDL_HasEvents() instead.
This function is available since SDL 2.0.0.