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⇤ ← Revision 1 as of 2010-05-14 22:36:08
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Comment: create page, add content (Wed Mar 10 ver; changeset 4428)
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Size: 1997
Comment: added question
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SDL_SetEventFilter
Use this function to set up a filter to process all events before they change internal state and are posted to the internal event queue.
Contents
Syntax
void SDL_SetEventFilter(SDL_EventFilter filter,
void* userdata)
Function Parameters
filter |
typedef int (SDLCALL * SDL_EventFilter) (void *userdata, SDL_Event * event); ??? the SDL_!EventFilter to be referenced/run ??? |
userdata |
a pointer filled with user-specified information to be filtered |
Return Value
green
green
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, but the internal state will still be updated. This allows selective filtering of dynamically arriving events.
Code Examples
The filter is protypted as:
int SDL_EventFilter(void *userdata, SDL_Event * event);
You can add your code example here
Remarks
![/!\](/moin_static198/fixedleft/img/alert.png "/!\"){kind=small}
Be very careful of what you do in the event filter function, as it may run in a different thread!
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.
