poll method
Poll for currently pending events.
If event
is not NULL, the next event is removed from the queue and stored
in the SDL_Event structure pointed to by event
. The 1 returned refers to
this event, immediately stored in the SDL Event structure -- not an event
to follow.
If event
is NULL, it simply returns 1 if there is an event in the queue,
but will not remove it from the queue.
As this function may implicitly call SDL_PumpEvents(), you can only call this function in the thread that set the video mode.
SDL_PollEvent() is the favored way of receiving system events since it can be done from the main loop and does not suspend the main loop while waiting on an event to be posted.
The common practice is to fully process the event queue once every frame, usually as a first step before updating the game's state:
while (game_is_still_running) {
SDL_Event event;
while (SDL_PollEvent(&event)) { // poll until all events are handled!
// decide what to do with this event.
}
// update game state, draw the current frame
}
\param event the SDL_Event structure to be filled with the next event from the queue, or NULL. \returns true if this got an event or false if there are none available.
\threadsafety This function should only be called on the main thread.
\since This function is available since SDL 3.1.3.
\sa SDL_PushEvent \sa SDL_WaitEvent \sa SDL_WaitEventTimeout
extern SDL_DECLSPEC bool SDLCALL SDL_PollEvent(SDL_Event *event)
Implementation
bool poll() {
return sdlPollEvent(this);
}