stb/tests/textedit_sample.c

   1 // I haven't actually tested this yet, this is just to make sure it compiles
   2
   3 #include <stdlib.h>
   4 #include <string.h> // memmove
   5 #include <ctype.h>  // isspace
   6
   7 #define STB_TEXTEDIT_CHARTYPE   char
   8 #define STB_TEXTEDIT_STRING     text_control
   9
  10 // get the base type
  11 #include "stb_textedit.h"
  12
  13 // define our editor structure
  14 typedef struct
  15 {
  16    char *string;
  17    int stringlen;
  18    STB_TexteditState state;
  19 } text_control;
  20
  21 // define the functions we need
  22 void layout_func(StbTexteditRow *row, STB_TEXTEDIT_STRING *str, int start_i)
  23 {
  24    int remaining_chars = str->stringlen - start_i;
  25    row->num_chars = remaining_chars > 20 ? 20 : remaining_chars; // should do real word wrap here
  26    row->x0 = 0;
  27    row->x1 = 20; // need to account for actual size of characters
  28    row->baseline_y_delta = 1.25;
  29    row->ymin = -1;
  30    row->ymax =  0;
  31 }
  32
  33 int delete_chars(STB_TEXTEDIT_STRING *str, int pos, int num)
  34 {
  35    memmove(&str->string[pos], &str->string[pos+num], str->stringlen - (pos+num));
  36    str->stringlen -= num;
  37    return 1; // always succeeds
  38 }
  39
  40 int insert_chars(STB_TEXTEDIT_STRING *str, int pos, STB_TEXTEDIT_CHARTYPE *newtext, int num)
  41 {
  42    str->string = realloc(str->string, str->stringlen + num);
  43    memmove(&str->string[pos+num], &str->string[pos], str->stringlen - pos);
  44    memcpy(&str->string[pos], newtext, num);
  45    str->stringlen += num;
  46    return 1; // always succeeds
  47 }
  48
  49 // define all the #defines needed
  50
  51 #define KEYDOWN_BIT                    0x80000000
  52
  53 #define STB_TEXTEDIT_STRINGLEN(tc)     ((tc)->stringlen)
  54 #define STB_TEXTEDIT_LAYOUTROW         layout_func
  55 #define STB_TEXTEDIT_GETWIDTH(tc,n,i)  (1) // quick hack for monospaced
  56 #define STB_TEXTEDIT_KEYTOTEXT(key)    (((key) & KEYDOWN_BIT) ? 0 : (key))
  57 #define STB_TEXTEDIT_GETCHAR(tc,i)     ((tc)->string[i])
  58 #define STB_TEXTEDIT_NEWLINE           '\n'
  59 #define STB_TEXTEDIT_IS_SPACE(ch)      isspace(ch)
  60 #define STB_TEXTEDIT_DELETECHARS       delete_chars
  61 #define STB_TEXTEDIT_INSERTCHARS       insert_chars
  62
  63 #define STB_TEXTEDIT_K_SHIFT           0x40000000
  64 #define STB_TEXTEDIT_K_CONTROL         0x20000000
  65 #define STB_TEXTEDIT_K_LEFT            (KEYDOWN_BIT | 1) // actually use VK_LEFT, SDLK_LEFT, etc
  66 #define STB_TEXTEDIT_K_RIGHT           (KEYDOWN_BIT | 2) // VK_RIGHT
  67 #define STB_TEXTEDIT_K_UP              (KEYDOWN_BIT | 3) // VK_UP
  68 #define STB_TEXTEDIT_K_DOWN            (KEYDOWN_BIT | 4) // VK_DOWN
  69 #define STB_TEXTEDIT_K_LINESTART       (KEYDOWN_BIT | 5) // VK_HOME
  70 #define STB_TEXTEDIT_K_LINEEND         (KEYDOWN_BIT | 6) // VK_END
  71 #define STB_TEXTEDIT_K_TEXTSTART       (STB_TEXTEDIT_K_LINESTART | STB_TEXTEDIT_K_CONTROL)
  72 #define STB_TEXTEDIT_K_TEXTEND         (STB_TEXTEDIT_K_LINEEND   | STB_TEXTEDIT_K_CONTROL)
  73 #define STB_TEXTEDIT_K_DELETE          (KEYDOWN_BIT | 7) // VK_DELETE
  74 #define STB_TEXTEDIT_K_BACKSPACE       (KEYDOWN_BIT | 8) // VK_BACKSPACE
  75 #define STB_TEXTEDIT_K_UNDO            (KEYDOWN_BIT | STB_TEXTEDIT_K_CONTROL | 'z')
  76 #define STB_TEXTEDIT_K_REDO            (KEYDOWN_BIT | STB_TEXTEDIT_K_CONTROL | 'y')
  77 #define STB_TEXTEDIT_K_INSERT          (KEYDOWN_BIT | 9) // VK_INSERT
  78 #define STB_TEXTEDIT_K_WORDLEFT        (STB_TEXTEDIT_K_LEFT  | STB_TEXTEDIT_K_CONTROL)
  79 #define STB_TEXTEDIT_K_WORDRIGHT       (STB_TEXTEDIT_K_RIGHT | STB_TEXTEDIT_K_CONTROL)
  80 #define STB_TEXTEDIT_K_PGUP            (KEYDOWN_BIT | 10) // VK_PGUP -- not implemented
  81 #define STB_TEXTEDIT_K_PGDOWN          (KEYDOWN_BIT | 11) // VK_PGDOWN -- not implemented
  82
  83 #define STB_TEXTEDIT_IMPLEMENTATION
  84 #include "stb_textedit.h"