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