// set the default text to display
void textbox_text(textbox *tb, char *text)
{
if (tb->text) free(tb->text);
tb->text = strdup(text);
tb->cursor = MAX(0, MIN(strlen(text), tb->cursor));
textbox_extents(tb);
}
// set an input prompt for edit mode
void textbox_prompt( textbox *tb, char *text )
{
if ( tb->prompt ) free( tb->prompt );
tb->prompt = strdup( text );
textbox_extents( tb );
}
// remove text
void textbox_delete(textbox *tb, int pos, int dlen)
{
int len = strlen(tb->text);
pos = MAX(0, MIN(len, pos));
// move everything after pos+dlen down
char *at = tb->text + pos;
memmove(at, at + dlen, len - pos);
textbox_extents(tb);
}
// insert text
void textbox_insert(textbox *tb, int pos, char *str)
{
int len = strlen(tb->text), slen = strlen(str);
pos = MAX(0, MIN(len, pos));
// expand buffer
tb->text = realloc(tb->text, len + slen + 1);
// move everything after cursor upward
char *at = tb->text + pos;
memmove(at + slen, at, len - pos + 1);
// insert new str
memmove(at, str, slen);
textbox_extents(tb);
}
