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Diffstat (limited to 'src/ui/text_input.h')
| -rw-r--r-- | src/ui/text_input.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/src/ui/text_input.h b/src/ui/text_input.h new file mode 100644 index 0000000..8dc416f --- /dev/null +++ b/src/ui/text_input.h @@ -0,0 +1,85 @@ +/* + This file is part of GNUnet. + Copyright (C) 2022 GNUnet e.V. + + GNUnet is free software: you can redistribute it and/or modify it + under the terms of the GNU Affero General Public License as published + by the Free Software Foundation, either version 3 of the License, + or (at your option) any later version. + + GNUnet is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. + + SPDX-License-Identifier: AGPL3.0-or-later + */ +/* + * @author Tobias Frisch + * @file ui/text_input.h + */ + +#ifndef UI_TEXT_INPUT_H_ +#define UI_TEXT_INPUT_H_ + +#include <ctype.h> + +#define text_input_event(text, key) { \ + switch (key) \ + { \ + case KEY_LEFT: \ + { \ + text##_pos--; \ + break; \ + } \ + case KEY_RIGHT: \ + { \ + text##_pos++; \ + break; \ + } \ + case KEY_BACKSPACE: \ + { \ + if ((text##_pos < text##_len) && (text##_pos > 0)) \ + for (int i = text##_pos; i < text##_len; i++) \ + text[i - 1] = text[i]; \ + \ + if ((text##_pos > 0) && (text##_len > 0)) \ + { \ + text##_pos--; \ + text##_len--; \ + } \ + \ + break; \ + } \ + default: \ + { \ + if (!isprint(key)) \ + break; \ + \ + for (int i = text##_len - 1; i >= text##_pos; i--) \ + text[i + 1] = text[i]; \ + \ + text[text##_pos++] = (char) key; \ + text##_len++; \ + break; \ + } \ + } \ + \ + int max_len = (int) sizeof(text) - 1; \ + \ + if (text##_len > max_len) \ + text##_len = max_len; \ + \ + text[text##_len] = '\0'; \ + \ + if (text##_pos < 0) \ + text##_pos = 0; \ + \ + if (text##_pos > text##_len) \ + text##_pos = text##_len; \ +} + +#endif /* UI_TEXT_INPUT_H_ */ |