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     size_t cursor;
  21     const char *selected_item;
  22 };
  23
  24 ListSelector *create_list_selector(const Sprite_font *sprite_font,
  25                                    const char *items[],
  26                                    size_t count)
  27 {
  28     trace_assert(items);
  29
  30     Lt *lt = create_lt();
  31     if (lt == NULL) {
  32         return NULL;
  33     }
  34
  35     ListSelector *list_selector = PUSH_LT(lt, nth_alloc(sizeof(ListSelector)), free);
  36     if (list_selector == NULL) {
  37         RETURN_LT(lt, NULL);
  38     }
  39     list_selector->lt = lt;
  40
  41     list_selector->sprite_font = sprite_font;
  42     list_selector->items = items;
  43     list_selector->count = count;
  44     list_selector->cursor = 0;
  45     list_selector->selected_item = NULL;
  46
  47     return list_selector;
  48 }
  49
  50 void destroy_list_selector(ListSelector *list_selector)
  51 {
  52     trace_assert(list_selector);
  53     RETURN_LT0(list_selector->lt);
  54 }
  55
  56 int list_selector_render(const ListSelector *list_selector,
  57                          SDL_Renderer *renderer,
  58                          Vec position,
  59                          Vec font_scale,
  60                          float padding_bottom)
  61 {
  62     trace_assert(list_selector);
  63     trace_assert(renderer);
  64
  65     for (size_t i = 0; i < list_selector->count; ++i) {
  66         const Vec current_position = vec_sum(
  67             position,
  68             vec(0.0f, (float) i * ((float) FONT_CHAR_HEIGHT * font_scale.y + padding_bottom)));
  69
  70         if (sprite_font_render_text(
  71                 list_selector->sprite_font,
  72                 renderer,
  73                 current_position,
  74                 font_scale,
  75                 rgba(1.0f, 1.0f, 1.0f, 1.0f),
  76                 list_selector->items[i]) < 0) {
  77             return -1;
  78         }
  79
  80         if (i == list_selector->cursor) {
  81             SDL_Rect boundary_box = rect_for_sdl(
  82                 sprite_font_boundary_box(
  83                     list_selector->sprite_font,
  84                     current_position,
  85                     font_scale,
  86                     list_selector->items[i]));
  87             if (SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255) < 0) {
  88                 return -1;
  89             }
  90
  91             if (SDL_RenderDrawRect(renderer, &boundary_box) < 0) {
  92                 return -1;
  93             }
  94         }
  95     }
  96
  97     return 0;
  98 }
  99
 100 Vec list_selector_size(const ListSelector *list_selector,
 101                        Vec font_scale,
 102                        float padding_bottom)
 103 {
 104     trace_assert(list_selector);
 105
 106     Vec result = vec(0.0f, 0.0f);
 107
 108     for (size_t i = 0; i < list_selector->count; ++i) {
 109         Rect boundary_box = sprite_font_boundary_box(
 110             list_selector->sprite_font,
 111             vec(0.0f, 0.0f),
 112             font_scale,
 113             list_selector->items[i]);
 114
 115         result.x = fmaxf(result.x, boundary_box.w);
 116         result.y += boundary_box.y + padding_bottom;
 117     }
 118
 119     return result;
 120 }
 121
 122 int list_selector_update(ListSelector *list_selector, float delta_time)
 123 {
 124     trace_assert(list_selector);
 125     (void) delta_time;
 126
 127     return 0;
 128 }
 129
 130 int list_selector_event(ListSelector *list_selector, const SDL_Event *event)
 131 {
 132     trace_assert(list_selector);
 133     trace_assert(event);
 134
 135     switch (event->type) {
 136     case SDL_KEYDOWN:
 137         switch (event->key.keysym.sym) {
 138         case SDLK_UP:
 139             if (list_selector->cursor > 0) {
 140                 list_selector->cursor--;
 141             }
 142             break;
 143         case SDLK_DOWN:
 144             if (list_selector->cursor < list_selector->count - 1) {
 145                 list_selector->cursor++;
 146             }
 147             break;
 148         case SDLK_RETURN:
 149             list_selector->selected_item = list_selector->items[list_selector->cursor];
 150             break;
 151         }
 152         break;
 153     }
 154
 155     return 0;
 156 }
 157
 158 const char *list_selector_selected(const ListSelector *list_selector)
 159 {
 160     trace_assert(list_selector);
 161     return list_selector->selected_item;
 162 }
 163
 164 void list_selector_clean_selection(ListSelector *list_selector)
 165 {
 166     trace_assert(list_selector);
 167     list_selector->selected_item = NULL;
 168 }