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Diffstat (limited to 'src/ui/list_input.h')
| -rw-r--r-- | src/ui/list_input.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/src/ui/list_input.h b/src/ui/list_input.h new file mode 100644 index 0000000..aad3ae4 --- /dev/null +++ b/src/ui/list_input.h @@ -0,0 +1,114 @@ +/* + 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/list_input.h + */ + +#ifndef UI_LIST_INPUT_H_ +#define UI_LIST_INPUT_H_ + +#include <stdbool.h> +#include <stdlib.h> + +#define list_input_reset(list) { \ + (list)->line_index = 0; \ + (list)->selected = NULL; \ +} + +#define list_input_select(list, line_width, item) { \ + const bool selected = ( \ + ((list)->line_selected >= (list)->line_index) && \ + ((list)->line_selected < (list)->line_index + line_width) \ + ); \ + \ + (list)->line_index += line_width; \ + \ + if (selected) \ + (list)->selected = item; \ +} + +#define list_input_event(list, key) { \ + int count = (list)->line_index; \ + \ + switch (key) \ + { \ + case KEY_UP: \ + { \ + (list)->line_selected--; \ + break; \ + } \ + case KEY_DOWN: \ + { \ + (list)->line_selected++; \ + break; \ + } \ + default: \ + break; \ + } \ + \ + if ((list)->line_selected < 0) \ + (list)->line_selected = 0; \ + else if ((list)->line_selected >= count) \ + (list)->line_selected = count - 1; \ + \ + if ((list)->window) \ + { \ + const int height = getmaxy((list)->window); \ + const int y = (list)->line_selected - (list)->line_offset; \ + \ + if (y < 0) \ + (list)->line_offset += y; \ + else if (y + 1 >= height) \ + (list)->line_offset += y + 1 - height; \ + \ + if ((list)->line_offset < 0) \ + (list)->line_offset = 0; \ + else if ((list)->line_offset >= count) \ + (list)->line_offset = count - 1; \ + } \ +} + +#define list_input_print_(list, line_width, yes_res, no_res) \ + const bool selected = ( \ + ((list)->line_selected >= (list)->line_index) && \ + ((list)->line_selected < (list)->line_index + line_width) \ + ); \ + \ + const int y = (list)->line_index - (list)->line_offset; { \ + \ + (list)->line_index += line_width; \ + \ + if (y + line_width < 1) \ + return yes_res; \ + \ + const int height = getmaxy((list)->window); \ + \ + if (y >= height) \ + return no_res; \ +} + +#define list_input_print_gnunet(list, line_width) \ + list_input_print_(list, line_width, GNUNET_YES, GNUNET_NO) + +#define list_input_print(list, line_width) \ + list_input_print_(list, line_width, , ) + +#endif /* UI_LIST_INPUT_H_ */ |