src/events/SDL_active.c
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FUNCTIONS
This source file includes following functions.
- SDL_AppActiveInit
- SDL_GetAppState
- SDL_PrivateAppActive
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with this library; if not, write to the Free
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 Sam Lantinga
20 slouken@devolution.com
21 */
22
23 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id: SDL_active.c,v 1.3.2.5 2001/02/10 07:20:04 hercules Exp $";
26 #endif
27
28 /* Application focus/iconification handling code for SDL */
29
30 #include <stdio.h>
31 #include <string.h>
32
33 #include "SDL_events.h"
34 #include "SDL_events_c.h"
35
36
37 /* These are static for our active event handling code */
38 static Uint8 SDL_appstate = 0;
39
40 /* Public functions */
41 int SDL_AppActiveInit(void)
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42 {
43 /* Start completely active */
44 SDL_appstate = (SDL_APPACTIVE|SDL_APPINPUTFOCUS|SDL_APPMOUSEFOCUS);
45
46 /* That's it! */
47 return(0);
48 }
49
50 Uint8 SDL_GetAppState(void)
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51 {
52 return(SDL_appstate);
53 }
54
55 /* This is global for SDL_eventloop.c */
56 int SDL_PrivateAppActive(Uint8 gain, Uint8 state)
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57 {
58 int posted;
59 Uint8 new_state;
60
61 /* Modify the current state with the given mask */
62 if ( gain ) {
63 new_state = (SDL_appstate | state);
64 } else {
65 new_state = (SDL_appstate & ~state);
66 }
67
68 /* Drop events that don't change state */
69 if ( new_state == SDL_appstate ) {
70 return(0);
71 }
72
73 /* Update internal active state */
74 SDL_appstate = new_state;
75
76 /* Post the event, if desired */
77 posted = 0;
78 if ( SDL_ProcessEvents[SDL_ACTIVEEVENT] == SDL_ENABLE ) {
79 SDL_Event event;
80 memset(&event, 0, sizeof(event));
81 event.type = SDL_ACTIVEEVENT;
82 event.active.gain = gain;
83 event.active.state = state;
84 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
85 posted = 1;
86 SDL_PushEvent(&event);
87 }
88 }
89
90 /* If we lost keyboard focus, post key-up events */
91 if ( (state & SDL_APPINPUTFOCUS) && !gain ) {
92 SDL_ResetKeyboard();
93 }
94 return(posted);
95 }