Function stb_textedit_key

KBotExt/imgui/imstb_textedit.h:716–1098

API key: process a keyboard input

// API key: process a keyboard input
static void stb_textedit_key(STB_TEXTEDIT_STRING* str, STB_TexteditState* state, STB_TEXTEDIT_KEYTYPE key)
{
retry:
	switch (key) {
	default: {
		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;
				}
			}
		}
		break;
	}

#ifdef STB_TEXTEDIT_K_INSERT
	case STB_TEXTEDIT_K_INSERT:
		state->insert_mode = !state->insert_mode;
		break;
#endif

	case STB_TEXTEDIT_K_UNDO:
		stb_text_undo(str, state);
		state->has_preferred_x = 0;
		break;

	case STB_TEXTEDIT_K_REDO:
		stb_text_redo(str, state);
		state->has_preferred_x = 0;
		break;

	case STB_TEXTEDIT_K_LEFT:
		// if currently there's a selection, move cursor to start of selection
		if (STB_TEXT_HAS_SELECTION(state))
			stb_textedit_move_to_first(state);
		else
			if (state->cursor > 0)
				--state->cursor;
		state->has_preferred_x = 0;
		break;