scripts/kconfig/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, write to the Free Software
  21  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include "dialog.h"
  25
  26 static int list_width, check_x, item_x;
  27
  28 /*
  29  * Print list item
  30  */
  31 static void print_item(WINDOW * win, const char *item, int status, int choice,
  32                        int selected)
  33 {
  34         int i;
  35
  36         /* Clear 'residue' of last item */
  37         wattrset(win, menubox_attr);
  38         wmove(win, choice, 0);
  39         for (i = 0; i < list_width; i++)
  40                 waddch(win, ' ');
  41
  42         wmove(win, choice, check_x);
  43         wattrset(win, selected ? check_selected_attr : check_attr);
  44         wprintw(win, "(%c)", status ? 'X' : ' ');
  45
  46         wattrset(win, selected ? tag_selected_attr : tag_attr);
  47         mvwaddch(win, choice, item_x, item[0]);
  48         wattrset(win, selected ? item_selected_attr : item_attr);
  49         waddstr(win, (char *)item + 1);
  50         if (selected) {
  51                 wmove(win, choice, check_x + 1);
  52                 wrefresh(win);
  53         }
  54 }
  55
  56 /*
  57  * Print the scroll indicators.
  58  */
  59 static void print_arrows(WINDOW * win, int choice, int item_no, int scroll,
  60              int y, int x, int height)
  61 {
  62         wmove(win, y, x);
  63
  64         if (scroll > 0) {
  65                 wattrset(win, uarrow_attr);
  66                 waddch(win, ACS_UARROW);
  67                 waddstr(win, "(-)");
  68         } else {
  69                 wattrset(win, menubox_attr);
  70                 waddch(win, ACS_HLINE);
  71                 waddch(win, ACS_HLINE);
  72                 waddch(win, ACS_HLINE);
  73                 waddch(win, ACS_HLINE);
  74         }
  75
  76         y = y + height + 1;
  77         wmove(win, y, x);
  78
  79         if ((height < item_no) && (scroll + choice < item_no - 1)) {
  80                 wattrset(win, darrow_attr);
  81                 waddch(win, ACS_DARROW);
  82                 waddstr(win, "(+)");
  83         } else {
  84                 wattrset(win, menubox_border_attr);
  85                 waddch(win, ACS_HLINE);
  86                 waddch(win, ACS_HLINE);
  87                 waddch(win, ACS_HLINE);
  88                 waddch(win, ACS_HLINE);
  89         }
  90 }
  91
  92 /*
  93  *  Display the termination buttons
  94  */
  95 static void print_buttons(WINDOW * dialog, int height, int width, int selected)
  96 {
  97         int x = width / 2 - 11;
  98         int y = height - 2;
  99
 100         print_button(dialog, "Select", y, x, selected == 0);
 101         print_button(dialog, " Help ", y, x + 14, selected == 1);
 102
 103         wmove(dialog, y, x + 1 + 14 * selected);
 104         wrefresh(dialog);
 105 }
 106
 107 /*
 108  * Display a dialog box with a list of options that can be turned on or off
 109  * in the style of radiolist (only one option turned on at a time).
 110  */
 111 int dialog_checklist(const char *title, const char *prompt, int height,
 112                      int width, int list_height, int item_no,
 113                      const char *const *items)
 114 {
 115         int i, x, y, box_x, box_y;
 116         int key = 0, button = 0, choice = 0, scroll = 0, max_choice, *status;
 117         WINDOW *dialog, *list;
 118
 119         /* Allocate space for storing item on/off status */
 120         if ((status = malloc(sizeof(int) * item_no)) == NULL) {
 121                 endwin();
 122                 fprintf(stderr,
 123                         "\nCan't allocate memory in dialog_checklist().\n");
 124                 exit(-1);
 125         }
 126
 127         /* Initializes status */
 128         for (i = 0; i < item_no; i++) {
 129                 status[i] = !strcasecmp(items[i * 3 + 2], "on");
 130                 if ((!choice && status[i])
 131                     || !strcasecmp(items[i * 3 + 2], "selected"))
 132                         choice = i + 1;
 133         }
 134         if (choice)
 135                 choice--;
 136
 137         max_choice = MIN(list_height, item_no);
 138
 139         /* center dialog box on screen */
 140         x = (COLS - width) / 2;
 141         y = (LINES - height) / 2;
 142
 143         draw_shadow(stdscr, y, x, height, width);
 144
 145         dialog = newwin(height, width, y, x);
 146         keypad(dialog, TRUE);
 147
 148         draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
 149         wattrset(dialog, border_attr);
 150         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
 151         for (i = 0; i < width - 2; i++)
 152                 waddch(dialog, ACS_HLINE);
 153         wattrset(dialog, dialog_attr);
 154         waddch(dialog, ACS_RTEE);
 155
 156         print_title(dialog, title, width);
 157
 158         wattrset(dialog, dialog_attr);
 159         print_autowrap(dialog, prompt, width - 2, 1, 3);
 160
 161         list_width = width - 6;
 162         box_y = height - list_height - 5;
 163         box_x = (width - list_width) / 2 - 1;
 164
 165         /* create new window for the list */
 166         list = subwin(dialog, list_height, list_width, y + box_y + 1,
 167                       x + box_x + 1);
 168
 169         keypad(list, TRUE);
 170
 171         /* draw a box around the list items */
 172         draw_box(dialog, box_y, box_x, list_height + 2, list_width + 2,
 173                  menubox_border_attr, menubox_attr);
 174
 175         /* Find length of longest item in order to center checklist */
 176         check_x = 0;
 177         for (i = 0; i < item_no; i++)
 178                 check_x = MAX(check_x, +strlen(items[i * 3 + 1]) + 4);
 179
 180         check_x = (list_width - check_x) / 2;
 181         item_x = check_x + 4;
 182
 183         if (choice >= list_height) {
 184                 scroll = choice - list_height + 1;
 185                 choice -= scroll;
 186         }
 187
 188         /* Print the list */
 189         for (i = 0; i < max_choice; i++) {
 190                 if (i != choice)
 191                         print_item(list, items[(scroll + i) * 3 + 1],
 192                                    status[i + scroll], i, 0);
 193         }
 194         print_item(list, items[(scroll + choice) * 3 + 1],
 195                    status[choice + scroll], choice, 1);
 196
 197         print_arrows(dialog, choice, item_no, scroll,
 198                      box_y, box_x + check_x + 5, list_height);
 199
 200         print_buttons(dialog, height, width, 0);
 201
 202         wnoutrefresh(dialog);
 203         wnoutrefresh(list);
 204         doupdate();
 205
 206         while (key != ESC) {
 207                 key = wgetch(dialog);
 208
 209                 for (i = 0; i < max_choice; i++)
 210                         if (toupper(key) ==
 211                             toupper(items[(scroll + i) * 3 + 1][0]))
 212                                 break;
 213
 214                 if (i < max_choice || key == KEY_UP || key == KEY_DOWN ||
 215                     key == '+' || key == '-') {
 216                         if (key == KEY_UP || key == '-') {
 217                                 if (!choice) {
 218                                         if (!scroll)
 219                                                 continue;
 220                                         /* Scroll list down */
 221                                         if (list_height > 1) {
 222                                                 /* De-highlight current first item */
 223                                                 print_item(list, items[scroll * 3 + 1],
 224                                                            status[scroll], 0, FALSE);
 225                                                 scrollok(list, TRUE);
 226                                                 wscrl(list, -1);
 227                                                 scrollok(list, FALSE);
 228                                         }
 229                                         scroll--;
 230                                         print_item(list, items[scroll * 3 + 1], status[scroll], 0, TRUE);
 231                                         print_arrows(dialog, choice, item_no,
 232                                                      scroll, box_y, box_x + check_x + 5, list_height);
 233
 234                                         wnoutrefresh(dialog);
 235                                         wrefresh(list);
 236
 237                                         continue;       /* wait for another key press */
 238                                 } else
 239                                         i = choice - 1;
 240                         } else if (key == KEY_DOWN || key == '+') {
 241                                 if (choice == max_choice - 1) {
 242                                         if (scroll + choice >= item_no - 1)
 243                                                 continue;
 244                                         /* Scroll list up */
 245                                         if (list_height > 1) {
 246                                                 /* De-highlight current last item before scrolling up */
 247                                                 print_item(list, items[(scroll + max_choice - 1) * 3 + 1],
 248                                                            status[scroll + max_choice - 1],
 249                                                            max_choice - 1, FALSE);
 250                                                 scrollok(list, TRUE);
 251                                                 wscrl(list, 1);
 252                                                 scrollok(list, FALSE);
 253                                         }
 254                                         scroll++;
 255                                         print_item(list, items[(scroll + max_choice - 1) * 3 + 1],
 256                                                    status[scroll + max_choice - 1], max_choice - 1, TRUE);
 257
 258                                         print_arrows(dialog, choice, item_no,
 259                                                      scroll, box_y, box_x + check_x + 5, list_height);
 260
 261                                         wnoutrefresh(dialog);
 262                                         wrefresh(list);
 263
 264                                         continue;       /* wait for another key press */
 265                                 } else
 266                                         i = choice + 1;
 267                         }
 268                         if (i != choice) {
 269                                 /* De-highlight current item */
 270                                 print_item(list, items[(scroll + choice) * 3 + 1],
 271                                            status[scroll + choice], choice, FALSE);
 272                                 /* Highlight new item */
 273                                 choice = i;
 274                                 print_item(list, items[(scroll + choice) * 3 + 1],
 275                                            status[scroll + choice], choice, TRUE);
 276                                 wnoutrefresh(dialog);
 277                                 wrefresh(list);
 278                         }
 279                         continue;       /* wait for another key press */
 280                 }
 281                 switch (key) {
 282                 case 'H':
 283                 case 'h':
 284                 case '?':
 285                         fprintf(stderr, "%s", items[(scroll + choice) * 3]);
 286                         delwin(dialog);
 287                         free(status);
 288                         return 1;
 289                 case TAB:
 290                 case KEY_LEFT:
 291                 case KEY_RIGHT:
 292                         button = ((key == KEY_LEFT ? --button : ++button) < 0)
 293                             ? 1 : (button > 1 ? 0 : button);
 294
 295                         print_buttons(dialog, height, width, button);
 296                         wrefresh(dialog);
 297                         break;
 298                 case 'S':
 299                 case 's':
 300                 case ' ':
 301                 case '\n':
 302                         if (!button) {
 303                                 if (!status[scroll + choice]) {
 304                                         for (i = 0; i < item_no; i++)
 305                                                 status[i] = 0;
 306                                         status[scroll + choice] = 1;
 307                                         for (i = 0; i < max_choice; i++)
 308                                                 print_item(list, items[(scroll + i) * 3 + 1],
 309                                                            status[scroll + i], i, i == choice);
 310                                 }
 311                                 wnoutrefresh(dialog);
 312                                 wrefresh(list);
 313
 314                                 for (i = 0; i < item_no; i++)
 315                                         if (status[i])
 316                                                 fprintf(stderr, "%s", items[i * 3]);
 317                         } else
 318                                 fprintf(stderr, "%s", items[(scroll + choice) * 3]);
 319                         delwin(dialog);
 320                         free(status);
 321                         return button;
 322                 case 'X':
 323                 case 'x':
 324                         key = ESC;
 325                 case ESC:
 326                         break;
 327                 }
 328
 329                 /* Now, update everything... */
 330                 doupdate();
 331         }
 332
 333         delwin(dialog);
 334         free(status);
 335         return -1;              /* ESC pressed */
 336 }