clav.c

   1 #include <locale.h>
   2 #include <stdint.h>
   3 #include <stdio.h>
   4
   5 #include "macros.h"
   6 #include "ui.h"
   7
   8 /* The general state of the application */
   9 static enum {
  10         ST_DEFAULT = 0,
  11         ST_ASKING_QUIT,
  12         ST_SHOULD_QUIT
  13 } state;
  14
  15 /* Having received some kind of input, change state accordingly */
  16 static int state_transition(struct ui_event *e)
  17 {
  18         int ret = 0;
  19
  20         switch (state) {
  21         case ST_SHOULD_QUIT:
  22                 break;
  23         case ST_DEFAULT:
  24
  25                 switch (e->type) {
  26                 case ET_INITIAL_QUIT:
  27                         ret = ui_confirm_deny("Quit?");
  28                         state = ST_ASKING_QUIT;
  29                         break;
  30                 case ET_FORCE_QUIT:
  31                         state = ST_SHOULD_QUIT;
  32                         break;
  33                 case ET_NONE:
  34                 case ET_CONFIRM:
  35                 case ET_DENY:
  36                         break;
  37                 }
  38
  39                 break;
  40         case ST_ASKING_QUIT:
  41
  42                 switch (e->type) {
  43                 case ET_CONFIRM:
  44                 case ET_FORCE_QUIT:
  45                         state = ST_SHOULD_QUIT;
  46                         break;
  47                 case ET_DENY:
  48                         state = ST_DEFAULT;
  49                         break;
  50                 case ET_NONE:
  51                 case ET_INITIAL_QUIT:
  52                         break;
  53                 }
  54
  55                 break;
  56         }
  57
  58         if (ret) {
  59                 state = ST_SHOULD_QUIT;
  60         }
  61
  62         return ret;
  63 }
  64
  65 /* Main loop */
  66 int main(int argc, char **argv)
  67 {
  68         int ret;
  69         uint_fast8_t more_evs = 0;
  70         struct ui_event e = { 0 };
  71
  72         UNUSED(argc);
  73         UNUSED(argv);
  74         setlocale(LC_ALL, "");
  75
  76         if ((ret = ui_init())) {
  77                 goto done;
  78         }
  79
  80         if ((ret = ui_start_frame())) {
  81                 goto done;
  82         }
  83
  84         while (state != ST_SHOULD_QUIT) {
  85                 /* includes framelimiting delay */
  86                 if ((ret = ui_finish_frame())) {
  87                         goto done;
  88                 }
  89
  90                 more_evs = 1;
  91
  92                 while (more_evs) {
  93                         if ((ret = ui_get_event(&e, &more_evs))) {
  94                                 goto done;
  95                         }
  96
  97                         if (e.type) {
  98                                 state_transition(&e);
  99                         }
 100                 }
 101
 102                 if ((ret = ui_start_frame())) {
 103                         goto done;
 104                 }
 105         }
 106
 107 done:
 108         ui_teardown();
 109
 110         return ret;
 111 }