badge/ui/menu.c

   1 #include "menu.h"
   2
   3 #include "event.h"
   4 #include "font.h"
   5 #include "sprite.h"
   6
   7 #include <stdbool.h>
   8
   9 enum {
  10   MENU_ARROW_UP,
  11   MENU_ARROW_DOWN,
  12
  13   MENU_SCROLL_TICKS = 25
  14 };
  15
  16 static badge_sprite const arrows[] = {
  17   { 5, 7, (uint8_t const *) "\x04\xc3\xdf\x40" },
  18   { 5, 7, (uint8_t const *) "\x10\xd8\x1f\x06\x01" }
  19 };
  20
  21 enum {
  22   MENU_MARGIN_TOP      = 3,
  23   MENU_MARGIN_BOTTOM   = 2,
  24   MENU_MARGIN_LEFT     = 3,
  25   MENU_ENTRIES_HEIGHT  = 1 + BADGE_FONT_HEIGHT,
  26   MENU_ENTRIES_VISIBLE = (BADGE_DISPLAY_HEIGHT - MENU_MARGIN_TOP - MENU_MARGIN_BOTTOM) / MENU_ENTRIES_HEIGHT
  27 };
  28
  29 static void badge_menu_show(char const *const *menu,
  30                             size_t n,
  31                             size_t *first_visible,
  32                             size_t selected,
  33                             char   selector)
  34 {
  35   badge_framebuffer fb = { { { 0 } } };
  36   bool arrow_up   = true;
  37   bool arrow_down = true;
  38
  39   size_t first_used_row = 0;
  40   size_t used_rows = MENU_ENTRIES_VISIBLE;
  41
  42   if(selected >= n) {
  43     selected = n - 1;
  44   }
  45
  46   if(n <= MENU_ENTRIES_VISIBLE) {
  47     *first_visible = 0;
  48     used_rows      = n;
  49     first_used_row = (MENU_ENTRIES_VISIBLE - used_rows) / 2;
  50   } else if(selected + 1 == n) {
  51     *first_visible = n - MENU_ENTRIES_VISIBLE;
  52   } else if(selected <= *first_visible) {
  53     *first_visible = selected == 0 ? 0 : selected - 1;
  54   } else if(selected - *first_visible + 2 > MENU_ENTRIES_VISIBLE) {
  55     *first_visible = selected - MENU_ENTRIES_VISIBLE + 2;
  56   }
  57
  58   if(*first_visible == 0) {
  59     arrow_up = false;
  60   }
  61
  62   if(*first_visible + MENU_ENTRIES_VISIBLE >= n) {
  63     arrow_down = false;
  64   }
  65
  66   for(size_t i = 0; i < used_rows; ++i) {
  67     badge_framebuffer_render_text(&fb,
  68                                   (int8_t) (MENU_MARGIN_LEFT + BADGE_FONT_WIDTH),
  69                                   (int8_t) (MENU_MARGIN_TOP  + (first_used_row + i) * MENU_ENTRIES_HEIGHT),
  70                                   menu[*first_visible + i]);
  71   }
  72
  73   badge_framebuffer_render_char(&fb, MENU_MARGIN_LEFT, MENU_MARGIN_TOP + MENU_ENTRIES_HEIGHT * (selected - *first_visible + first_used_row), selector);
  74   if(arrow_up  ) { badge_framebuffer_blt(&fb, MENU_MARGIN_LEFT, MENU_MARGIN_TOP,                                                    &arrows[MENU_ARROW_UP  ], 0); }
  75   if(arrow_down) { badge_framebuffer_blt(&fb, MENU_MARGIN_LEFT, MENU_MARGIN_TOP + (MENU_ENTRIES_VISIBLE - 1) * MENU_ENTRIES_HEIGHT, &arrows[MENU_ARROW_DOWN], 0); }
  76
  77   badge_framebuffer_flush(&fb);
  78 }
  79
  80 size_t badge_menu(char const *const *menu,
  81                   size_t  n,
  82                   size_t *first_visible,
  83                   size_t  selected)
  84 {
  85   unsigned scroll_ticks = 0;
  86   int scroll_direction = 0;
  87
  88   for(;;) {
  89     if(scroll_ticks == 0) {
  90       if       (scroll_direction ==  1 && selected + 1 <  n) {
  91         ++selected;
  92       } else if(scroll_direction == -1 && selected     != 0) {
  93         --selected;
  94       }
  95
  96       badge_menu_show(menu, n, first_visible, selected, '*');
  97
  98       scroll_ticks = MENU_SCROLL_TICKS;
  99     }
 100
 101     badge_event_t ev;
 102
 103     ev = badge_event_wait();
 104     switch(badge_event_type(ev)) {
 105     case BADGE_EVENT_USER_INPUT:
 106     {
 107       uint8_t old_state = badge_event_old_input_state(ev);
 108       uint8_t new_state = badge_event_new_input_state(ev);
 109       uint8_t new_buttons = new_state & (old_state ^ new_state);
 110
 111       if(new_buttons & (BADGE_EVENT_KEY_BTN_A | BADGE_EVENT_KEY_BTN_B)) {
 112         return selected;
 113       } else if((new_buttons & BADGE_EVENT_KEY_UP  )) {
 114         scroll_direction = -1;
 115       } else if((new_buttons & BADGE_EVENT_KEY_DOWN)) {
 116         scroll_direction =  1;
 117       } else {
 118         scroll_direction =  0;
 119       }
 120
 121       scroll_ticks = 0;
 122       break;
 123     }
 124     case BADGE_EVENT_GAME_TICK:
 125     {
 126       --scroll_ticks;
 127       break;
 128     }
 129     }
 130   }
 131 }
 132
 133 void badge_scroll_text(char const *const *lines, size_t n) {
 134   size_t first_visible  = 0;
 135   int scroll_direction  = 0;
 136   unsigned scroll_ticks = 0;
 137
 138   for(;;) {
 139     if(scroll_ticks == 0) {
 140       if       (scroll_direction ==  1 && first_visible + MENU_ENTRIES_VISIBLE < n) {
 141         ++first_visible;
 142       } else if(scroll_direction == -1 && first_visible != 0) {
 143         --first_visible;
 144       }
 145
 146       badge_menu_show(lines, n, &first_visible, first_visible + (first_visible + 1 == n ? 0 : 1), ' ');
 147
 148       scroll_ticks = MENU_SCROLL_TICKS;
 149     }
 150
 151     badge_event_t ev;
 152
 153     ev = badge_event_wait();
 154     switch(badge_event_type(ev)) {
 155     case BADGE_EVENT_USER_INPUT:
 156     {
 157       uint8_t old_state = badge_event_old_input_state(ev);
 158       uint8_t new_state = badge_event_new_input_state(ev);
 159       uint8_t new_buttons = new_state & (old_state ^ new_state);
 160
 161       if(new_buttons & (BADGE_EVENT_KEY_BTN_A | BADGE_EVENT_KEY_BTN_B)) {
 162         return;
 163       } else if((new_buttons & BADGE_EVENT_KEY_UP  )) {
 164         scroll_direction = -1;
 165       } else if((new_buttons & BADGE_EVENT_KEY_DOWN)) {
 166         scroll_direction =  1;
 167       } else {
 168         scroll_direction =  0;
 169       }
 170
 171       scroll_ticks = 0;
 172       break;
 173     }
 174     case BADGE_EVENT_GAME_TICK:
 175     {
 176       --scroll_ticks;
 177       break;
 178     }
 179     }
 180   }
 181 }