NAME

       SDL_SetEventFilter - Sets up a filter to process all events before they are posted to the event queue.

SYNOPSIS

       #include "SDL.h"

       void SDL_SetEventFilter(SDL_EventFilter filter);

DESCRIPTION

       This function sets up a filter to process all events before they are posted to the event queue. This is a
       very powerful and flexible feature. The filter is prototyped as:

       typedef int (*SDL_EventFilter)(const SDL_Event *event);

        If  the  filter returns 1, then the event will be added to the internal queue. If it returns 0, then the
       event will be dropped from the queue. This allows selective filtering of dynamically.

       There is one caveat when dealing with the SDL_QUITEVENT event type. The event filter is only called  when
       the  window  manager  desires  to  close  the application window. If the event filter returns 1, then the
       window will be closed, otherwise the window will remain open if possible. If the quit event is  generated
       by an interrupt signal, it will bypass the internal queue and be delivered to the application at the next
       event poll.

              Note:

              Events  pushed  onto  the queue with SDL_PushEvent or SDL_PeepEvents do not get passed through the
              event filter.

              Note:

              Be Careful! The event filter function may run in a different thread so  be  careful  what  you  do
              within it.

SEE ALSO

       SDL_Event, SDL_GetEventFilter, SDL_PushEvent

SDL                                          Tue 11 Sep 2001, 22:59                        SDL_SetEventFilter(3)