extra/config/lxdialog/checklist.c

   1 /*
   2  *  checklist.c -- implements the checklist box
   3  *
   4  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
   5  *     Stuart Herbert - S.Herbert@sheffield.ac.uk: radiolist extension
   6  *     Alessandro Rubini - rubini@ipvvis.unipv.it: merged the two
   7  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
   8  *
   9  *  This program is free software; you can redistribute it and/or
  10  *  modify it under the terms of the GNU General Public License
  11  *  as published by the Free Software Foundation; either version 2
  12  *  of the License, or (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include "dialog.h"
  24
  25 static int list_width, check_x, item_x;
  26
  27 /*
  28  * Print list item
  29  */
  30 static void print_item(WINDOW * win, int choice, int selected)
  31 {
  32         int i;
  33
  34         /* Clear 'residue' of last item */
  35         wattrset(win, dlg.menubox.atr);
  36         wmove(win, choice, 0);
  37         for (i = 0; i < list_width; i++)
  38                 waddch(win, ' ');
  39
  40         wmove(win, choice, check_x);
  41         wattrset(win, selected ? dlg.check_selected.atr
  42                  : dlg.check.atr);
  43         wprintw(win, "(%c)", item_is_tag('X') ? 'X' : ' ');
  44
  45         wattrset(win, selected ? dlg.tag_selected.atr : dlg.tag.atr);
  46         mvwaddch(win, choice, item_x, item_str()[0]);
  47         wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
  48         waddstr(win, (char *)item_str() + 1);
  49         if (selected) {
  50                 wmove(win, choice, check_x + 1);
  51                 wrefresh(win);
  52         }
  53 }
  54
  55 /*
  56  * Print the scroll indicators.
  57  */
  58 static void print_arrows(WINDOW * win, int choice, int item_no, int scroll,
  59              int y, int x, int height)
  60 {
  61         wmove(win, y, x);
  62
  63         if (scroll > 0) {
  64                 wattrset(win, dlg.uarrow.atr);
  65                 waddch(win, ACS_UARROW);
  66                 waddstr(win, "(-)");
  67         } else {
  68                 wattrset(win, dlg.menubox.atr);
  69                 waddch(win, ACS_HLINE);
  70                 waddch(win, ACS_HLINE);
  71                 waddch(win, ACS_HLINE);
  72                 waddch(win, ACS_HLINE);
  73         }
  74
  75         y = y + height + 1;
  76         wmove(win, y, x);
  77
  78         if ((height < item_no) && (scroll + choice < item_no - 1)) {
  79                 wattrset(win, dlg.darrow.atr);
  80                 waddch(win, ACS_DARROW);
  81                 waddstr(win, "(+)");
  82         } else {
  83                 wattrset(win, dlg.menubox_border.atr);
  84                 waddch(win, ACS_HLINE);
  85                 waddch(win, ACS_HLINE);
  86                 waddch(win, ACS_HLINE);
  87                 waddch(win, ACS_HLINE);
  88         }
  89 }
  90
  91 /*
  92  *  Display the termination buttons
  93  */
  94 static void print_buttons(WINDOW * dialog, int height, int width, int selected)
  95 {
  96         int x = width / 2 - 11;
  97         int y = height - 2;
  98
  99         print_button(dialog, gettext("Select"), y, x, selected == 0);
 100         print_button(dialog, gettext(" Help "), y, x + 14, selected == 1);
 101
 102         wmove(dialog, y, x + 1 + 14 * selected);
 103         wrefresh(dialog);
 104 }
 105
 106 /*
 107  * Display a dialog box with a list of options that can be turned on or off
 108  * in the style of radiolist (only one option turned on at a time).
 109  */
 110 int dialog_checklist(const char *title, const char *prompt, int height,
 111                      int width, int list_height)
 112 {
 113         int i, x, y, box_x, box_y;
 114         int key = 0, button = 0, choice = 0, scroll = 0, max_choice;
 115         WINDOW *dialog, *list;
 116
 117         /* which item to highlight */
 118         item_foreach() {
 119                 if (item_is_tag('X'))
 120                         choice = item_n();
 121                 if (item_is_selected()) {
 122                         choice = item_n();
 123                         break;
 124                 }
 125         }
 126
 127 do_resize:
 128         if (getmaxy(stdscr) < (height + 6))
 129                 return -ERRDISPLAYTOOSMALL;
 130         if (getmaxx(stdscr) < (width + 6))
 131                 return -ERRDISPLAYTOOSMALL;
 132
 133         max_choice = MIN(list_height, item_count());
 134
 135         /* center dialog box on screen */
 136         x = (COLS - width) / 2;
 137         y = (LINES - height) / 2;
 138
 139         draw_shadow(stdscr, y, x, height, width);
 140
 141         dialog = newwin(height, width, y, x);
 142         keypad(dialog, TRUE);
 143
 144         draw_box(dialog, 0, 0, height, width,
 145                  dlg.dialog.atr, dlg.border.atr);
 146         wattrset(dialog, dlg.border.atr);
 147         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
 148         for (i = 0; i < width - 2; i++)
 149                 waddch(dialog, ACS_HLINE);
 150         wattrset(dialog, dlg.dialog.atr);
 151         waddch(dialog, ACS_RTEE);
 152
 153         print_title(dialog, title, width);
 154
 155         wattrset(dialog, dlg.dialog.atr);
 156         print_autowrap(dialog, prompt, width - 2, 1, 3);
 157
 158         list_width = width - 6;
 159         box_y = height - list_height - 5;
 160         box_x = (width - list_width) / 2 - 1;
 161
 162         /* create new window for the list */
 163         list = subwin(dialog, list_height, list_width, y + box_y + 1,
 164                       x + box_x + 1);
 165
 166         keypad(list, TRUE);
 167
 168         /* draw a box around the list items */
 169         draw_box(dialog, box_y, box_x, list_height + 2, list_width + 2,
 170                  dlg.menubox_border.atr, dlg.menubox.atr);
 171
 172         /* Find length of longest item in order to center checklist */
 173         check_x = 0;
 174         item_foreach()
 175                 check_x = MAX(check_x, strlen(item_str()) + 4);
 176
 177         check_x = (list_width - check_x) / 2;
 178         item_x = check_x + 4;
 179
 180         if (choice >= list_height) {
 181                 scroll = choice - list_height + 1;
 182                 choice -= scroll;
 183         }
 184
 185         /* Print the list */
 186         for (i = 0; i < max_choice; i++) {
 187                 item_set(scroll + i);
 188                 print_item(list, i, i == choice);
 189         }
 190
 191         print_arrows(dialog, choice, item_count(), scroll,
 192                      box_y, box_x + check_x + 5, list_height);
 193
 194         print_buttons(dialog, height, width, 0);
 195
 196         wnoutrefresh(dialog);
 197         wnoutrefresh(list);
 198         doupdate();
 199
 200         while (key != KEY_ESC) {
 201                 key = wgetch(dialog);
 202
 203                 for (i = 0; i < max_choice; i++) {
 204                         item_set(i + scroll);
 205                         if (toupper(key) == toupper(item_str()[0]))
 206                                 break;
 207                 }
 208
 209                 if (i < max_choice || key == KEY_UP || key == KEY_DOWN ||
 210                     key == '+' || key == '-') {
 211                         if (key == KEY_UP || key == '-') {
 212                                 if (!choice) {
 213                                         if (!scroll)
 214                                                 continue;
 215                                         /* Scroll list down */
 216                                         if (list_height > 1) {
 217                                                 /* De-highlight current first item */
 218                                                 item_set(scroll);
 219                                                 print_item(list, 0, FALSE);
 220                                                 scrollok(list, TRUE);
 221                                                 wscrl(list, -1);
 222                                                 scrollok(list, FALSE);
 223                                         }
 224                                         scroll--;
 225                                         item_set(scroll);
 226                                         print_item(list, 0, TRUE);
 227                                         print_arrows(dialog, choice, item_count(),
 228                                                      scroll, box_y, box_x + check_x + 5, list_height);
 229
 230                                         wnoutrefresh(dialog);
 231                                         wrefresh(list);
 232
 233                                         continue;       /* wait for another key press */
 234                                 } else
 235                                         i = choice - 1;
 236                         } else if (key == KEY_DOWN || key == '+') {
 237                                 if (choice == max_choice - 1) {
 238                                         if (scroll + choice >= item_count() - 1)
 239                                                 continue;
 240                                         /* Scroll list up */
 241                                         if (list_height > 1) {
 242                                                 /* De-highlight current last item before scrolling up */
 243                                                 item_set(scroll + max_choice - 1);
 244                                                 print_item(list,
 245                                                             max_choice - 1,
 246                                                             FALSE);
 247                                                 scrollok(list, TRUE);
 248                                                 wscrl(list, 1);
 249                                                 scrollok(list, FALSE);
 250                                         }
 251                                         scroll++;
 252                                         item_set(scroll + max_choice - 1);
 253                                         print_item(list, max_choice - 1, TRUE);
 254
 255                                         print_arrows(dialog, choice, item_count(),
 256                                                      scroll, box_y, box_x + check_x + 5, list_height);
 257
 258                                         wnoutrefresh(dialog);
 259                                         wrefresh(list);
 260
 261                                         continue;       /* wait for another key press */
 262                                 } else
 263                                         i = choice + 1;
 264                         }
 265                         if (i != choice) {
 266                                 /* De-highlight current item */
 267                                 item_set(scroll + choice);
 268                                 print_item(list, choice, FALSE);
 269                                 /* Highlight new item */
 270                                 choice = i;
 271                                 item_set(scroll + choice);
 272                                 print_item(list, choice, TRUE);
 273                                 wnoutrefresh(dialog);
 274                                 wrefresh(list);
 275                         }
 276                         continue;       /* wait for another key press */
 277                 }
 278                 switch (key) {
 279                 case 'H':
 280                 case 'h':
 281                 case '?':
 282                         button = 1;
 283                         /* fall-through */
 284                 case 'S':
 285                 case 's':
 286                 case ' ':
 287                 case '\n':
 288                         item_foreach()
 289                                 item_set_selected(0);
 290                         item_set(scroll + choice);
 291                         item_set_selected(1);
 292                         delwin(list);
 293                         delwin(dialog);
 294                         return button;
 295                 case TAB:
 296                 case KEY_LEFT:
 297                 case KEY_RIGHT:
 298                         button = ((key == KEY_LEFT ? --button : ++button) < 0)
 299                             ? 1 : (button > 1 ? 0 : button);
 300
 301                         print_buttons(dialog, height, width, button);
 302                         wrefresh(dialog);
 303                         break;
 304                 case 'X':
 305                 case 'x':
 306                         key = KEY_ESC;
 307                         break;
 308                 case KEY_ESC:
 309                         key = on_key_esc(dialog);
 310                         break;
 311                 case KEY_RESIZE:
 312                         delwin(list);
 313                         delwin(dialog);
 314                         on_key_resize();
 315                         goto do_resize;
 316                 }
 317
 318                 /* Now, update everything... */
 319                 doupdate();
 320         }
 321         delwin(list);
 322         delwin(dialog);
 323         return key;             /* ESC pressed */
 324 }