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Old 11-25-2007
Timer and Time-Based Events

Tim Bass
Sun, 25 Nov 2007 09:11:58 +0000
Opher asks in his blog, Is there a non-event event ? on absence as a pattern.
All “non-event” examples that the*event processing*community has offered, to date, have been based on the premise that an event is created when something does not happen based on time, schedule or a timer - and many seem to want to refer to this as a*”non event.”
Opher is now calling this situation an “absent event.”
In my opinion, the correct term should be a “time-based event” because the event is triggered by a timer or similar time-based object; the*term “non-event” should be dropped from the event processing glossary.


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SDL_SetEventFilter(3)						 SDL API Reference					     SDL_SetEventFilter(3)

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 fea- ture. 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 pos- sible. 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)

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