config/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, int choice, int selected)
  32 {
  33         int i;
  34
  35         /* Clear 'residue' of last item */
  36         wattrset(win, dlg.menubox.atr);
  37         wmove(win, choice, 0);
  38         for (i = 0; i < list_width; i++)
  39                 waddch(win, ' ');
  40
  41         wmove(win, choice, check_x);
  42         wattrset(win, selected ? dlg.check_selected.atr
  43                  : dlg.check.atr);
  44         wprintw(win, "(%c)", item_is_tag('X') ? 'X' : ' ');
  45
  46         wattrset(win, selected ? dlg.tag_selected.atr : dlg.tag.atr);
  47         mvwaddch(win, choice, item_x, item_str()[0]);
  48         wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
  49         waddstr(win, (char *)item_str() + 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, dlg.uarrow.atr);
  66                 waddch(win, ACS_UARROW);
  67                 waddstr(win, "(-)");
  68         } else {
  69                 wattrset(win, dlg.menubox.atr);
  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, dlg.darrow.atr);
  81                 waddch(win, ACS_DARROW);
  82                 waddstr(win, "(+)");
  83         } else {
  84                 wattrset(win, dlg.menubox_border.atr);
  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)
 113 {
 114         int i, x, y, box_x, box_y;
 115         int key = 0, button = 0, choice = 0, scroll = 0, max_choice;
 116         WINDOW *dialog, *list;
 117
 118         /* which item to highlight */
 119         item_foreach() {
 120                 if (item_is_tag('X'))
 121                         choice = item_n();
 122                 if (item_is_selected()) {
 123                         choice = item_n();
 124                         break;
 125                 }
 126         }
 127
 128 do_resize:
 129         if (getmaxy(stdscr) < (height + 6))
 130                 return -ERRDISPLAYTOOSMALL;
 131         if (getmaxx(stdscr) < (width + 6))
 132                 return -ERRDISPLAYTOOSMALL;
 133
 134         max_choice = MIN(list_height, item_count());
 135
 136         /* center dialog box on screen */
 137         x = (COLS - width) / 2;
 138         y = (LINES - height) / 2;
 139
 140         draw_shadow(stdscr, y, x, height, width);
 141
 142         dialog = newwin(height, width, y, x);
 143         keypad(dialog, TRUE);
 144
 145         draw_box(dialog, 0, 0, height, width,
 146                  dlg.dialog.atr, dlg.border.atr);
 147         wattrset(dialog, dlg.border.atr);
 148         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
 149         for (i = 0; i < width - 2; i++)
 150                 waddch(dialog, ACS_HLINE);
 151         wattrset(dialog, dlg.dialog.atr);
 152         waddch(dialog, ACS_RTEE);
 153
 154         print_title(dialog, title, width);
 155
 156         wattrset(dialog, dlg.dialog.atr);
 157         print_autowrap(dialog, prompt, width - 2, 1, 3);
 158
 159         list_width = width - 6;
 160         box_y = height - list_height - 5;
 161         box_x = (width - list_width) / 2 - 1;
 162
 163         /* create new window for the list */
 164         list = subwin(dialog, list_height, list_width, y + box_y + 1,
 165                       x + box_x + 1);
 166
 167         keypad(list, TRUE);
 168
 169         /* draw a box around the list items */
 170         draw_box(dialog, box_y, box_x, list_height + 2, list_width + 2,
 171                  dlg.menubox_border.atr, dlg.menubox.atr);
 172
 173         /* Find length of longest item in order to center checklist */
 174         check_x = 0;
 175         item_foreach()
 176                 check_x = MAX(check_x, strlen(item_str()) + 4);
 177
 178         check_x = (list_width - check_x) / 2;
 179         item_x = check_x + 4;
 180
 181         if (choice >= list_height) {
 182                 scroll = choice - list_height + 1;
 183                 choice -= scroll;
 184         }
 185
 186         /* Print the list */
 187         for (i = 0; i < max_choice; i++) {
 188                 item_set(scroll + i);
 189                 print_item(list, i, i == choice);
 190         }
 191
 192         print_arrows(dialog, choice, item_count(), scroll,
 193                      box_y, box_x + check_x + 5, list_height);
 194
 195         print_buttons(dialog, height, width, 0);
 196
 197         wnoutrefresh(dialog);
 198         wnoutrefresh(list);
 199         doupdate();
 200
 201         while (key != KEY_ESC) {
 202                 key = wgetch(dialog);
 203
 204                 for (i = 0; i < max_choice; i++) {
 205                         item_set(i + scroll);
 206                         if (toupper(key) == toupper(item_str()[0]))
 207                                 break;
 208                 }
 209
 210                 if (i < max_choice || key == KEY_UP || key == KEY_DOWN ||
 211                     key == '+' || key == '-') {
 212                         if (key == KEY_UP || key == '-') {
 213                                 if (!choice) {
 214                                         if (!scroll)
 215                                                 continue;
 216                                         /* Scroll list down */
 217                                         if (list_height > 1) {
 218                                                 /* De-highlight current first item */
 219                                                 item_set(scroll);
 220                                                 print_item(list, 0, FALSE);
 221                                                 scrollok(list, TRUE);
 222                                                 wscrl(list, -1);
 223                                                 scrollok(list, FALSE);
 224                                         }
 225                                         scroll--;
 226                                         item_set(scroll);
 227                                         print_item(list, 0, TRUE);
 228                                         print_arrows(dialog, choice, item_count(),
 229                                                      scroll, box_y, box_x + check_x + 5, list_height);
 230
 231                                         wnoutrefresh(dialog);
 232                                         wrefresh(list);
 233
 234                                         continue;       /* wait for another key press */
 235                                 } else
 236                                         i = choice - 1;
 237                         } else if (key == KEY_DOWN || key == '+') {
 238                                 if (choice == max_choice - 1) {
 239                                         if (scroll + choice >= item_count() - 1)
 240                                                 continue;
 241                                         /* Scroll list up */
 242                                         if (list_height > 1) {
 243                                                 /* De-highlight current last item before scrolling up */
 244                                                 item_set(scroll + max_choice - 1);
 245                                                 print_item(list,
 246                                                             max_choice - 1,
 247                                                             FALSE);
 248                                                 scrollok(list, TRUE);
 249                                                 wscrl(list, 1);
 250                                                 scrollok(list, FALSE);
 251                                         }
 252                                         scroll++;
 253                                         item_set(scroll + max_choice - 1);
 254                                         print_item(list, max_choice - 1, TRUE);
 255
 256                                         print_arrows(dialog, choice, item_count(),
 257                                                      scroll, box_y, box_x + check_x + 5, list_height);
 258
 259                                         wnoutrefresh(dialog);
 260                                         wrefresh(list);
 261
 262                                         continue;       /* wait for another key press */
 263                                 } else
 264                                         i = choice + 1;
 265                         }
 266                         if (i != choice) {
 267                                 /* De-highlight current item */
 268                                 item_set(scroll + choice);
 269                                 print_item(list, choice, FALSE);
 270                                 /* Highlight new item */
 271                                 choice = i;
 272                                 item_set(scroll + choice);
 273                                 print_item(list, choice, TRUE);
 274                                 wnoutrefresh(dialog);
 275                                 wrefresh(list);
 276                         }
 277                         continue;       /* wait for another key press */
 278                 }
 279                 switch (key) {
 280                 case 'H':
 281                 case 'h':
 282                 case '?':
 283                         button = 1;
 284                         /* fall-through */
 285                 case 'S':
 286                 case 's':
 287                 case ' ':
 288                 case '\n':
 289                         item_foreach()
 290                                 item_set_selected(0);
 291                         item_set(scroll + choice);
 292                         item_set_selected(1);
 293                         delwin(list);
 294                         delwin(dialog);
 295                         return button;
 296                 case TAB:
 297                 case KEY_LEFT:
 298                 case KEY_RIGHT:
 299                         button = ((key == KEY_LEFT ? --button : ++button) < 0)
 300                             ? 1 : (button > 1 ? 0 : button);
 301
 302                         print_buttons(dialog, height, width, button);
 303                         wrefresh(dialog);
 304                         break;
 305                 case 'X':
 306                 case 'x':
 307                         key = KEY_ESC;
 308                         break;
 309                 case KEY_ESC:
 310                         key = on_key_esc(dialog);
 311                         break;
 312                 case KEY_RESIZE:
 313                         delwin(list);
 314                         delwin(dialog);
 315                         on_key_resize();
 316                         goto do_resize;
 317                 }
 318
 319                 /* Now, update everything... */
 320                 doupdate();
 321         }
 322         delwin(list);
 323         delwin(dialog);
 324         return key;             /* ESC pressed */
 325 }