1 #include <SDL/SDL.h>

     2 

     3 Uint32 timeout_callback(Uint32 interval, void *param)

     4 {

     5     SDL_Event event;

     6     event.type = SDL_USEREVENT;

     7     event.user.code = 1;

     8     SDL_PushEvent(&event);

     9     return 0;

    10 }

    11 

    12 bool handle_events(Uint32 timeout)

    13 {

    14     SDL_Event event;

    15     SDL_TimerID timer_id = NULL;

    16     bool done = false;

    17 

    18     if (timeout)

    19     {

    20         timer_id = SDL_AddTimer(timeout, timeout_callback, NULL);

    21     }

    22 

    23     // wait for events and handle them

    24     if (SDL_WaitEvent(&event))

    25     {

    26         do

    27         {

    28             switch (event.type)

    29             {

    30             case SDL_USEREVENT:

    31                 // timeout

    32                 if (event.user.code == 1)

    33                 {

    34                     SDL_RemoveTimer(timer_id);

    35                     printf("timeout\n");

    36                 }

    37                 break; // continue loop

    38 

    39             case SDL_QUIT:

    40                 printf("quit\n");

    41                 done = true;

    42                 break;

    43 

    44             case SDL_KEYUP:

    45                 printf("keyup\n");

    46                 if (event.key.keysym.sym == SDLK_ESCAPE)

    47                 {

    48                     done = true;

    49                 }

    50                 break;

    51 

    52             case SDL_MOUSEBUTTONDOWN:

    53                 printf("mouse button down\n");

    54                 break;

    55 

    56             case SDL_MOUSEBUTTONUP:

    57                 printf("mouse button up\n");

    58                 break;

    59             }

    60         }

    61         while (SDL_PollEvent(&event));

    62     }

    63     // remove timer when other event came before timeout

    64     if (timeout)

    65     {

    66         SDL_RemoveTimer(timer_id);

    67     }

    68     return done;

    69 }

    70 

    71 int main(int argc, char **argv)

    72 {

    73     SDL_Surface* screen = NULL;

    74 

    75     if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) == -1)

    76     {

    77         fprintf(stderr, "SDL_Init: %s\n", SDL_GetError());

    78         exit(1);

    79     }

    80 

    81     atexit(SDL_Quit);

    82 

    83     screen = SDL_SetVideoMode(800, 480, 16, SDL_SWSURFACE);

    84     if (screen == NULL)

    85     {

    86         fprintf(stderr, "SDL_SetVideoMode: %s\n", SDL_GetError());

    87         exit(1);

    88     }

    89 

    90     bool done = false;

    91     while (!done)

    92     {

    93         done = handle_events(1000);

    94     }

    95 

    96     return (0);

    97 }