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      = 2,
  23   MENU_MARGIN_BOTTOM   = 3,
  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(n <= MENU_ENTRIES_VISIBLE) {
  43     *first_visible = 0;
  44     used_rows      = n;
  45     first_used_row = (MENU_ENTRIES_VISIBLE - used_rows) / 2;
  46   } else if(selected + 1 == n) {
  47     *first_visible = n - MENU_ENTRIES_VISIBLE;
  48   } else if(selected <= *first_visible) {
  49     *first_visible = selected == 0 ? 0 : selected - 1;
  50   } else if(selected - *first_visible + 2 > MENU_ENTRIES_VISIBLE) {
  51     *first_visible = selected - MENU_ENTRIES_VISIBLE + 2;
  52   }
  53
  54   if(*first_visible == 0) {
  55     arrow_up = false;
  56   }
  57
  58   if(*first_visible + MENU_ENTRIES_VISIBLE >= n) {
  59     arrow_down = false;
  60   }
  61
  62   for(size_t i = 0; i < used_rows; ++i) {
  63     badge_framebuffer_render_text(&fb,
  64                                   (int8_t) (MENU_MARGIN_LEFT + BADGE_FONT_WIDTH),
  65                                   (int8_t) (MENU_MARGIN_TOP  + (first_used_row + i) * MENU_ENTRIES_HEIGHT),
  66                                   menu[*first_visible + i]);
  67   }
  68
  69   badge_framebuffer_render_char(&fb, MENU_MARGIN_LEFT, MENU_MARGIN_TOP + MENU_ENTRIES_HEIGHT * (selected - *first_visible + first_used_row), selector);
  70   if(arrow_up  ) { badge_framebuffer_blt(&fb, MENU_MARGIN_LEFT, MENU_MARGIN_TOP,                                                    &arrows[MENU_ARROW_UP  ], 0); }
  71   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); }
  72
  73   badge_framebuffer_flush(&fb);
  74 }
  75
  76 size_t badge_menu(char const *const *menu,
  77                   size_t  n,
  78                   size_t *first_visible,
  79                   size_t  selected)
  80 {
  81   unsigned scroll_ticks = 0;
  82   int scroll_direction = 0;
  83
  84   for(;;) {
  85     if(scroll_ticks == 0) {
  86       if       (scroll_direction ==  1 && selected + 1 <  n) {
  87         ++selected;
  88       } else if(scroll_direction == -1 && selected     != 0) {
  89         --selected;
  90       }
  91
  92       badge_menu_show(menu, n, first_visible, selected, '*');
  93
  94       scroll_ticks = MENU_SCROLL_TICKS;
  95     }
  96
  97     badge_event_t ev;
  98
  99     ev = badge_event_wait();
 100     switch(badge_event_type(ev)) {
 101     case BADGE_EVENT_USER_INPUT:
 102     {
 103       uint8_t old_state = badge_event_old_input_state(ev);
 104       uint8_t new_state = badge_event_new_input_state(ev);
 105       uint8_t new_buttons = new_state & (old_state ^ new_state);
 106
 107       if(new_buttons & (BADGE_EVENT_KEY_BTN_A | BADGE_EVENT_KEY_BTN_B)) {
 108         return selected;
 109       } else if((new_buttons & BADGE_EVENT_KEY_UP  )) {
 110         scroll_direction = -1;
 111       } else if((new_buttons & BADGE_EVENT_KEY_DOWN)) {
 112         scroll_direction =  1;
 113       } else {
 114         scroll_direction =  0;
 115       }
 116
 117       scroll_ticks = 0;
 118       break;
 119     }
 120     case BADGE_EVENT_GAME_TICK:
 121     {
 122       --scroll_ticks;
 123       break;
 124     }
 125     }
 126   }
 127 }
 128
 129 void badge_scroll_text(char const *const *lines, size_t n) {
 130   size_t first_visible  = 0;
 131   int scroll_direction  = 0;
 132   unsigned scroll_ticks = 0;
 133
 134   for(;;) {
 135     if(scroll_ticks == 0) {
 136       if       (scroll_direction ==  1 && first_visible + MENU_ENTRIES_VISIBLE < n) {
 137         ++first_visible;
 138       } else if(scroll_direction == -1 && first_visible != 0) {
 139         --first_visible;
 140       }
 141
 142       badge_menu_show(lines, n, &first_visible, first_visible + (first_visible + 1 == n ? 0 : 1), ' ');
 143
 144       scroll_ticks = MENU_SCROLL_TICKS;
 145     }
 146
 147     badge_event_t ev;
 148
 149     ev = badge_event_wait();
 150     switch(badge_event_type(ev)) {
 151     case BADGE_EVENT_USER_INPUT:
 152     {
 153       uint8_t old_state = badge_event_old_input_state(ev);
 154       uint8_t new_state = badge_event_new_input_state(ev);
 155       uint8_t new_buttons = new_state & (old_state ^ new_state);
 156
 157       if(new_buttons & (BADGE_EVENT_KEY_BTN_A | BADGE_EVENT_KEY_BTN_B)) {
 158         return;
 159       } else if((new_buttons & BADGE_EVENT_KEY_UP  )) {
 160         scroll_direction = -1;
 161       } else if((new_buttons & BADGE_EVENT_KEY_DOWN)) {
 162         scroll_direction =  1;
 163       } else {
 164         scroll_direction =  0;
 165       }
 166
 167       scroll_ticks = 0;
 168       break;
 169     }
 170     case BADGE_EVENT_GAME_TICK:
 171     {
 172       --scroll_ticks;
 173       break;
 174     }
 175     }
 176   }
 177 }