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stb_textedit: add optional API function for character input #1696

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stb_textedit: add optional API function for character input #1696

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53 changes: 33 additions & 20 deletions stb_textedit.h
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Original file line number Diff line number Diff line change
Expand Up @@ -200,6 +200,7 @@
// void stb_textedit_drag(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, float x, float y)
// int stb_textedit_cut(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
// int stb_textedit_paste(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, STB_TEXTEDIT_CHARTYPE *text, int len)
// void stb_textedit_char(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, STB_TEXTEDIT_CHARTYPE ch)
// void stb_textedit_key(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, STB_TEXEDIT_KEYTYPE key)
//
// Each of these functions potentially updates the string and updates the
Expand Down Expand Up @@ -227,6 +228,13 @@
// call this to paste text at the current cursor point or over the current
// selection if there is one.
//
// char:
// (optional) call this for character input sent to the textfield. if the
// framework you are using supplies you with a character or text event, it
// makes sense to use this function.
// make sure to set STB_TEXTEDIT_KEYTOTEXT to 0 for any key that generates
// a corresponding character or text event.
//
// key:
// call this for keyboard inputs sent to the textfield. you can use it
// for "key down" events or for "translated" key events. if you need to
Expand Down Expand Up @@ -716,6 +724,30 @@ static int stb_textedit_paste_internal(STB_TEXTEDIT_STRING *str, STB_TexteditSta
return 0;
}

// API char: process a character input
static void stb_textedit_char(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, STB_TEXTEDIT_CHARTYPE ch)
{
// can't add newline in single-line mode
if (ch == STB_TEXTEDIT_NEWLINE && state->single_line)
return;

if (state->insert_mode && !STB_TEXT_HAS_SELECTION(state) && state->cursor < STB_TEXTEDIT_STRINGLEN(str)) {
stb_text_makeundo_replace(str, state, state->cursor, 1, 1);
STB_TEXTEDIT_DELETECHARS(str, state->cursor, 1);
if (STB_TEXTEDIT_INSERTCHARS(str, state->cursor, &ch, 1)) {
++state->cursor;
state->has_preferred_x = 0;
}
} else {
stb_textedit_delete_selection(str,state); // implicitly clamps
if (STB_TEXTEDIT_INSERTCHARS(str, state->cursor, &ch, 1)) {
stb_text_makeundo_insert(state, state->cursor, 1);
++state->cursor;
state->has_preferred_x = 0;
}
}
}

#ifndef STB_TEXTEDIT_KEYTYPE
#define STB_TEXTEDIT_KEYTYPE int
#endif
Expand All @@ -729,26 +761,7 @@ static void stb_textedit_key(STB_TEXTEDIT_STRING *str, STB_TexteditState *state,
int c = STB_TEXTEDIT_KEYTOTEXT(key);
if (c > 0) {
STB_TEXTEDIT_CHARTYPE ch = (STB_TEXTEDIT_CHARTYPE) c;

// can't add newline in single-line mode
if (c == '\n' && state->single_line)
break;

if (state->insert_mode && !STB_TEXT_HAS_SELECTION(state) && state->cursor < STB_TEXTEDIT_STRINGLEN(str)) {
stb_text_makeundo_replace(str, state, state->cursor, 1, 1);
STB_TEXTEDIT_DELETECHARS(str, state->cursor, 1);
if (STB_TEXTEDIT_INSERTCHARS(str, state->cursor, &ch, 1)) {
++state->cursor;
state->has_preferred_x = 0;
}
} else {
stb_textedit_delete_selection(str,state); // implicitly clamps
if (STB_TEXTEDIT_INSERTCHARS(str, state->cursor, &ch, 1)) {
stb_text_makeundo_insert(state, state->cursor, 1);
++state->cursor;
state->has_preferred_x = 0;
}
}
stb_textedit_char(str, state, ch);
}
break;
}
Expand Down