SDL_SetEventFilter - Online Linux Manual PageSection : 3
Updated : Tue 11 Sep 2001, 22:59
Source : SDL
Note : SDL API Reference

NAMESDL_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);

DESCRIPTIONThis 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 ALSOSDL_Event, SDL_GetEventFilter, SDL_PushEvent
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