src/events/SDL_active.c
author Ryan C. Gordon
Wed, 29 Nov 2006 10:30:05 +0000
branchSDL-1.2
changeset 3900 ce3a2bd11305
parent 1402 d910939febfa
child 4159 a1b03ba2fcd0
permissions -rw-r--r--
Wrapped some macro params in parentheses for alloca wrappers.
Thansk, Suzuki Masahiro.
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2006 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 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     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 #include "SDL_config.h"
    23 
    24 /* Application focus/iconification handling code for SDL */
    25 
    26 #include "SDL_events.h"
    27 #include "SDL_events_c.h"
    28 
    29 
    30 /* These are static for our active event handling code */
    31 static Uint8 SDL_appstate = 0;
    32 
    33 /* Public functions */
    34 int SDL_AppActiveInit(void)
    35 {
    36 	/* Start completely active */
    37 	SDL_appstate = (SDL_APPACTIVE|SDL_APPINPUTFOCUS|SDL_APPMOUSEFOCUS);
    38 
    39 	/* That's it! */
    40 	return(0);
    41 }
    42 void SDL_AppActiveQuit(void)
    43 {
    44 }
    45 
    46 Uint8 SDL_GetAppState(void)
    47 {
    48 	return(SDL_appstate);
    49 }
    50 
    51 /* This is global for SDL_eventloop.c */
    52 int SDL_PrivateAppActive(Uint8 gain, Uint8 state)
    53 {
    54 	int posted;
    55 	Uint8 new_state;
    56 
    57 	/* Modify the current state with the given mask */
    58 	if ( gain ) {
    59 		new_state = (SDL_appstate | state);
    60 	} else {
    61 		new_state = (SDL_appstate & ~state);
    62 	}
    63 
    64 	/* Drop events that don't change state */
    65 	if ( new_state == SDL_appstate ) {
    66 		return(0);
    67 	}
    68 
    69 	/* Update internal active state */
    70 	SDL_appstate = new_state;
    71 
    72 	/* Post the event, if desired */
    73 	posted = 0;
    74 	if ( SDL_ProcessEvents[SDL_ACTIVEEVENT] == SDL_ENABLE ) {
    75 		SDL_Event event;
    76 		SDL_memset(&event, 0, sizeof(event));
    77 		event.type = SDL_ACTIVEEVENT;
    78 		event.active.gain = gain;
    79 		event.active.state = state;
    80 		if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
    81 			posted = 1;
    82 			SDL_PushEvent(&event);
    83 		}
    84 	}
    85 
    86 	/* If we lost keyboard focus, post key-up events */
    87 	if ( (state & SDL_APPINPUTFOCUS) && !gain ) {
    88 		SDL_ResetKeyboard();
    89 	}
    90 	return(posted);
    91 }