src/ui/list_selector.c

   1 #include <stdlib.h>
   2
   3 #include <SDL2/SDL.h>
   4
   5 #include "system/stacktrace.h"
   6 #include "system/lt.h"
   7 #include "system/nth_alloc.h"
   8 #include "system/str.h"
   9 #include "math/point.h"
  10 #include "game/sprite_font.h"
  11
  12 #include "./list_selector.h"
  13
  14 struct ListSelector
  15 {
  16     Lt *lt;
  17     const Sprite_font *sprite_font;
  18     const char **items;
  19     size_t count;
  20 };
  21
  22 ListSelector *create_list_selector(const Sprite_font *sprite_font,
  23                                    const char *items[],
  24                                    size_t count)
  25 {
  26     trace_assert(items);
  27
  28     Lt *lt = create_lt();
  29     if (lt == NULL) {
  30         return NULL;
  31     }
  32
  33     ListSelector *list_selector = PUSH_LT(lt, nth_alloc(sizeof(ListSelector)), free);
  34     if (list_selector == NULL) {
  35         RETURN_LT(lt, NULL);
  36     }
  37     list_selector->lt = lt;
  38
  39     list_selector->sprite_font = sprite_font;
  40
  41     list_selector->items = PUSH_LT(lt, nth_calloc(count, sizeof(const char*)), free);
  42     if (list_selector->items == NULL) {
  43         RETURN_LT(lt, NULL);
  44     }
  45
  46     for (size_t i = 0; i < count; ++i) {
  47         list_selector->items[i] = PUSH_LT(lt, string_duplicate(items[i], NULL), free);
  48         if (list_selector->items[i] == NULL) {
  49             RETURN_LT(lt, NULL);
  50         }
  51     }
  52
  53     list_selector->count = count;
  54
  55     return list_selector;
  56 }
  57
  58 void destroy_list_selector(ListSelector *list_selector)
  59 {
  60     trace_assert(list_selector);
  61     RETURN_LT0(list_selector->lt);
  62 }
  63
  64 int list_selector_render(const ListSelector *list_selector,
  65                          SDL_Renderer *renderer,
  66                          Vec position,
  67                          Vec font_scale,
  68                          float padding_bottom)
  69 {
  70     trace_assert(list_selector);
  71     trace_assert(renderer);
  72
  73     for (size_t i = 0; i < list_selector->count; ++i) {
  74         if (sprite_font_render_text(
  75                 list_selector->sprite_font,
  76                 renderer,
  77                 vec_sum(
  78                     position,
  79                     vec(0.0f, (float) i * ((float) FONT_CHAR_HEIGHT * font_scale.y + padding_bottom))),
  80                 font_scale,
  81                 rgba(1.0f, 1.0f, 1.0f, 1.0f),
  82                 list_selector->items[i]) < 0) {
  83             return -1;
  84         }
  85     }
  86
  87     return 0;
  88 }
  89
  90 Vec list_selector_size(const ListSelector *list_selector,
  91                        Vec font_scale,
  92                        float padding_bottom)
  93 {
  94     trace_assert(list_selector);
  95
  96     Vec result = vec(0.0f, 0.0f);
  97
  98     for (size_t i = 0; i < list_selector->count; ++i) {
  99         Rect boundary_box = sprite_font_boundary_box(
 100             list_selector->sprite_font,
 101             vec(0.0f, 0.0f),
 102             font_scale,
 103             list_selector->items[i]);
 104
 105         result.x = fmaxf(result.x, boundary_box.w);
 106         result.y += boundary_box.y + padding_bottom;
 107     }
 108
 109     return result;
 110 }
 111
 112 int list_selector_update(ListSelector *list_selector, float delta_time)
 113 {
 114     trace_assert(list_selector);
 115     (void) delta_time;
 116
 117     return 0;
 118 }
 119
 120 int list_selector_event(ListSelector *list_selector, const SDL_Event *event)
 121 {
 122     trace_assert(list_selector);
 123     trace_assert(event);
 124     return 0;
 125 }
 126
 127 const char *list_selector_selected(const ListSelector *list_selector)
 128 {
 129     trace_assert(list_selector);
 130     return NULL;
 131 }