diff docs/man3/SDL_SetEventFilter.3 @ 0:74212992fb08

Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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+.TH "SDL_SetEventFilter" "3" "Mon 12 Mar 2001, 01:03" "SDL" "SDL API Reference" 
+.SH "NAME"
+SDL_SetEventFilter\- Sets up a filter to process all events before they are posted to the event queue\&.
+.SH "SYNOPSIS"
+.PP
+\fB#include "SDL\&.h"
+.sp
+\fBvoid \fBSDL_SetEventFilter\fP\fR(\fBSDL_EventFilter filter\fR);
+.SH "DESCRIPTION"
+.PP
+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: 
+.PP
+.nf
+\f(CWtypedef int (*SDL_EventFilter)(const SDL_Event *event);\fR
+.fi
+.PP
+ If the filter returns \fB1\fR, then the event will be added to the internal queue\&. If it returns \fB0\fR, then the event will be dropped from the queue\&. This allows selective filtering of dynamically\&.
+.PP
+There is one caveat when dealing with the \fBSDL_QUITEVENT\fP 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\&.
+.PP
+.RS
+\fBNote:  
+.PP
+Events pushed onto the queue with \fI\fBSDL_PushEvent\fP\fR or \fI\fBSDL_PeepEvents\fP\fR do not get passed through the event filter\&.
+.RE
+.PP
+.RS
+\fBNote:  
+.PP
+\fIBe Careful!\fP The event filter function may run in a different thread so be careful what you do within it\&.
+.RE
+.SH "SEE ALSO"
+.PP
+\fI\fBSDL_Event\fR\fR, \fI\fBSDL_GetEventFilter\fP\fR, \fI\fBSDL_PushEvent\fP\fR
+...\" created by instant / docbook-to-man, Mon 12 Mar 2001, 01:03