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