support/kconfig/lxdialog/menubox.c

   1 /*
   2  *  menubox.c -- implements the menu box
   3  *
   4  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
   5  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
   6  *
   7  *  This program is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU General Public License
   9  *  as published by the Free Software Foundation; either version 2
  10  *  of the License, or (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 /*
  23  *  Changes by Clifford Wolf (god@clifford.at)
  24  *
  25  *  [ 1998-06-13 ]
  26  *
  27  *    *)  A bugfix for the Page-Down problem
  28  *
  29  *    *)  Formerly when I used Page Down and Page Up, the cursor would be set
  30  *        to the first position in the menu box.  Now lxdialog is a bit
  31  *        smarter and works more like other menu systems (just have a look at
  32  *        it).
  33  *
  34  *    *)  Formerly if I selected something my scrolling would be broken because
  35  *        lxdialog is re-invoked by the Menuconfig shell script, can't
  36  *        remember the last scrolling position, and just sets it so that the
  37  *        cursor is at the bottom of the box.  Now it writes the temporary file
  38  *        lxdialog.scrltmp which contains this information. The file is
  39  *        deleted by lxdialog if the user leaves a submenu or enters a new
  40  *        one, but it would be nice if Menuconfig could make another "rm -f"
  41  *        just to be sure.  Just try it out - you will recognise a difference!
  42  *
  43  *  [ 1998-06-14 ]
  44  *
  45  *    *)  Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
  46  *        and menus change their size on the fly.
  47  *
  48  *    *)  If for some reason the last scrolling position is not saved by
  49  *        lxdialog, it sets the scrolling so that the selected item is in the
  50  *        middle of the menu box, not at the bottom.
  51  *
  52  * 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)
  53  * Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus.
  54  * This fixes a bug in Menuconfig where using ' ' to descend into menus
  55  * would leave mis-synchronized lxdialog.scrltmp files lying around,
  56  * fscanf would read in 'scroll', and eventually that value would get used.
  57  */
  58
  59 #include "dialog.h"
  60
  61 static int menu_width, item_x;
  62
  63 /*
  64  * Print menu item
  65  */
  66 static void do_print_item(WINDOW * win, const char *item, int line_y,
  67                           int selected, int hotkey)
  68 {
  69         int j;
  70         char *menu_item = malloc(menu_width + 1);
  71
  72         strncpy(menu_item, item, menu_width - item_x);
  73         menu_item[menu_width - item_x] = '\0';
  74         j = first_alpha(menu_item, "YyNnMmHh");
  75
  76         /* Clear 'residue' of last item */
  77         wattrset(win, dlg.menubox.atr);
  78         wmove(win, line_y, 0);
  79 #if OLD_NCURSES
  80         {
  81                 int i;
  82                 for (i = 0; i < menu_width; i++)
  83                         waddch(win, ' ');
  84         }
  85 #else
  86         wclrtoeol(win);
  87 #endif
  88         wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
  89         mvwaddstr(win, line_y, item_x, menu_item);
  90         if (hotkey) {
  91                 wattrset(win, selected ? dlg.tag_key_selected.atr
  92                          : dlg.tag_key.atr);
  93                 mvwaddch(win, line_y, item_x + j, menu_item[j]);
  94         }
  95         if (selected) {
  96                 wmove(win, line_y, item_x + 1);
  97         }
  98         free(menu_item);
  99         wrefresh(win);
 100 }
 101
 102 #define print_item(index, choice, selected)                             \
 103 do {                                                                    \
 104         item_set(index);                                                \
 105         do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \
 106 } while (0)
 107
 108 /*
 109  * Print the scroll indicators.
 110  */
 111 static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
 112                          int height)
 113 {
 114         int cur_y, cur_x;
 115
 116         getyx(win, cur_y, cur_x);
 117
 118         wmove(win, y, x);
 119
 120         if (scroll > 0) {
 121                 wattrset(win, dlg.uarrow.atr);
 122                 waddch(win, ACS_UARROW);
 123                 waddstr(win, "(-)");
 124         } else {
 125                 wattrset(win, dlg.menubox.atr);
 126                 waddch(win, ACS_HLINE);
 127                 waddch(win, ACS_HLINE);
 128                 waddch(win, ACS_HLINE);
 129                 waddch(win, ACS_HLINE);
 130         }
 131
 132         y = y + height + 1;
 133         wmove(win, y, x);
 134         wrefresh(win);
 135
 136         if ((height < item_no) && (scroll + height < item_no)) {
 137                 wattrset(win, dlg.darrow.atr);
 138                 waddch(win, ACS_DARROW);
 139                 waddstr(win, "(+)");
 140         } else {
 141                 wattrset(win, dlg.menubox_border.atr);
 142                 waddch(win, ACS_HLINE);
 143                 waddch(win, ACS_HLINE);
 144                 waddch(win, ACS_HLINE);
 145                 waddch(win, ACS_HLINE);
 146         }
 147
 148         wmove(win, cur_y, cur_x);
 149         wrefresh(win);
 150 }
 151
 152 /*
 153  * Display the termination buttons.
 154  */
 155 static void print_buttons(WINDOW * win, int height, int width, int selected)
 156 {
 157         int x = width / 2 - 28;
 158         int y = height - 2;
 159
 160         print_button(win, gettext("Select"), y, x, selected == 0);
 161         print_button(win, gettext(" Exit "), y, x + 12, selected == 1);
 162         print_button(win, gettext(" Help "), y, x + 24, selected == 2);
 163         print_button(win, gettext(" Save "), y, x + 36, selected == 3);
 164         print_button(win, gettext(" Load "), y, x + 48, selected == 4);
 165
 166         wmove(win, y, x + 1 + 12 * selected);
 167         wrefresh(win);
 168 }
 169
 170 /* scroll up n lines (n may be negative) */
 171 static void do_scroll(WINDOW *win, int *scroll, int n)
 172 {
 173         /* Scroll menu up */
 174         scrollok(win, TRUE);
 175         wscrl(win, n);
 176         scrollok(win, FALSE);
 177         *scroll = *scroll + n;
 178         wrefresh(win);
 179 }
 180
 181 /*
 182  * Display a menu for choosing among a number of options
 183  */
 184 int dialog_menu(const char *title, const char *prompt,
 185                 const void *selected, int *s_scroll)
 186 {
 187         int i, j, x, y, box_x, box_y;
 188         int height, width, menu_height;
 189         int key = 0, button = 0, scroll = 0, choice = 0;
 190         int first_item =  0, max_choice;
 191         WINDOW *dialog, *menu;
 192
 193 do_resize:
 194         height = getmaxy(stdscr);
 195         width = getmaxx(stdscr);
 196         if (height < MENUBOX_HEIGTH_MIN || width < MENUBOX_WIDTH_MIN)
 197                 return -ERRDISPLAYTOOSMALL;
 198
 199         height -= 4;
 200         width  -= 5;
 201         menu_height = height - 10;
 202
 203         max_choice = MIN(menu_height, item_count());
 204
 205         /* center dialog box on screen */
 206         x = (getmaxx(stdscr) - width) / 2;
 207         y = (getmaxy(stdscr) - height) / 2;
 208
 209         draw_shadow(stdscr, y, x, height, width);
 210
 211         dialog = newwin(height, width, y, x);
 212         keypad(dialog, TRUE);
 213
 214         draw_box(dialog, 0, 0, height, width,
 215                  dlg.dialog.atr, dlg.border.atr);
 216         wattrset(dialog, dlg.border.atr);
 217         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
 218         for (i = 0; i < width - 2; i++)
 219                 waddch(dialog, ACS_HLINE);
 220         wattrset(dialog, dlg.dialog.atr);
 221         wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
 222         waddch(dialog, ACS_RTEE);
 223
 224         print_title(dialog, title, width);
 225
 226         wattrset(dialog, dlg.dialog.atr);
 227         print_autowrap(dialog, prompt, width - 2, 1, 3);
 228
 229         menu_width = width - 6;
 230         box_y = height - menu_height - 5;
 231         box_x = (width - menu_width) / 2 - 1;
 232
 233         /* create new window for the menu */
 234         menu = subwin(dialog, menu_height, menu_width,
 235                       y + box_y + 1, x + box_x + 1);
 236         keypad(menu, TRUE);
 237
 238         /* draw a box around the menu items */
 239         draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
 240                  dlg.menubox_border.atr, dlg.menubox.atr);
 241
 242         if (menu_width >= 80)
 243                 item_x = (menu_width - 70) / 2;
 244         else
 245                 item_x = 4;
 246
 247         /* Set choice to default item */
 248         item_foreach()
 249                 if (selected && (selected == item_data()))
 250                         choice = item_n();
 251         /* get the saved scroll info */
 252         scroll = *s_scroll;
 253         if ((scroll <= choice) && (scroll + max_choice > choice) &&
 254            (scroll >= 0) && (scroll + max_choice <= item_count())) {
 255                 first_item = scroll;
 256                 choice = choice - scroll;
 257         } else {
 258                 scroll = 0;
 259         }
 260         if ((choice >= max_choice)) {
 261                 if (choice >= item_count() - max_choice / 2)
 262                         scroll = first_item = item_count() - max_choice;
 263                 else
 264                         scroll = first_item = choice - max_choice / 2;
 265                 choice = choice - scroll;
 266         }
 267
 268         /* Print the menu */
 269         for (i = 0; i < max_choice; i++) {
 270                 print_item(first_item + i, i, i == choice);
 271         }
 272
 273         wnoutrefresh(menu);
 274
 275         print_arrows(dialog, item_count(), scroll,
 276                      box_y, box_x + item_x + 1, menu_height);
 277
 278         print_buttons(dialog, height, width, 0);
 279         wmove(menu, choice, item_x + 1);
 280         wrefresh(menu);
 281
 282         while (key != KEY_ESC) {
 283                 key = wgetch(menu);
 284
 285                 if (key < 256 && isalpha(key))
 286                         key = tolower(key);
 287
 288                 if (strchr("ynmh ", key))
 289                         i = max_choice;
 290                 else {
 291                         for (i = choice + 1; i < max_choice; i++) {
 292                                 item_set(scroll + i);
 293                                 j = first_alpha(item_str(), "YyNnMmHh");
 294                                 if (key == tolower(item_str()[j]))
 295                                         break;
 296                         }
 297                         if (i == max_choice)
 298                                 for (i = 0; i < max_choice; i++) {
 299                                         item_set(scroll + i);
 300                                         j = first_alpha(item_str(), "YyNnMmHh");
 301                                         if (key == tolower(item_str()[j]))
 302                                                 break;
 303                                 }
 304                 }
 305
 306                 if (item_count() != 0 &&
 307                     (i < max_choice ||
 308                      key == KEY_UP || key == KEY_DOWN ||
 309                      key == '-' || key == '+' ||
 310                      key == KEY_PPAGE || key == KEY_NPAGE)) {
 311                         /* Remove highligt of current item */
 312                         print_item(scroll + choice, choice, FALSE);
 313
 314                         if (key == KEY_UP || key == '-') {
 315                                 if (choice < 2 && scroll) {
 316                                         /* Scroll menu down */
 317                                         do_scroll(menu, &scroll, -1);
 318
 319                                         print_item(scroll, 0, FALSE);
 320                                 } else
 321                                         choice = MAX(choice - 1, 0);
 322
 323                         } else if (key == KEY_DOWN || key == '+') {
 324                                 print_item(scroll+choice, choice, FALSE);
 325
 326                                 if ((choice > max_choice - 3) &&
 327                                     (scroll + max_choice < item_count())) {
 328                                         /* Scroll menu up */
 329                                         do_scroll(menu, &scroll, 1);
 330
 331                                         print_item(scroll+max_choice - 1,
 332                                                    max_choice - 1, FALSE);
 333                                 } else
 334                                         choice = MIN(choice + 1, max_choice - 1);
 335
 336                         } else if (key == KEY_PPAGE) {
 337                                 scrollok(menu, TRUE);
 338                                 for (i = 0; (i < max_choice); i++) {
 339                                         if (scroll > 0) {
 340                                                 do_scroll(menu, &scroll, -1);
 341                                                 print_item(scroll, 0, FALSE);
 342                                         } else {
 343                                                 if (choice > 0)
 344                                                         choice--;
 345                                         }
 346                                 }
 347
 348                         } else if (key == KEY_NPAGE) {
 349                                 for (i = 0; (i < max_choice); i++) {
 350                                         if (scroll + max_choice < item_count()) {
 351                                                 do_scroll(menu, &scroll, 1);
 352                                                 print_item(scroll+max_choice-1,
 353                                                            max_choice - 1, FALSE);
 354                                         } else {
 355                                                 if (choice + 1 < max_choice)
 356                                                         choice++;
 357                                         }
 358                                 }
 359                         } else
 360                                 choice = i;
 361
 362                         print_item(scroll + choice, choice, TRUE);
 363
 364                         print_arrows(dialog, item_count(), scroll,
 365                                      box_y, box_x + item_x + 1, menu_height);
 366
 367                         wnoutrefresh(dialog);
 368                         wrefresh(menu);
 369
 370                         continue;       /* wait for another key press */
 371                 }
 372
 373                 switch (key) {
 374                 case KEY_LEFT:
 375                 case TAB:
 376                 case KEY_RIGHT:
 377                         button = ((key == KEY_LEFT ? --button : ++button) < 0)
 378                             ? 4 : (button > 4 ? 0 : button);
 379
 380                         print_buttons(dialog, height, width, button);
 381                         wrefresh(menu);
 382                         break;
 383                 case ' ':
 384                 case 's':
 385                 case 'y':
 386                 case 'n':
 387                 case 'm':
 388                 case '/':
 389                 case 'h':
 390                 case '?':
 391                 case 'z':
 392                 case '\n':
 393                         /* save scroll info */
 394                         *s_scroll = scroll;
 395                         delwin(menu);
 396                         delwin(dialog);
 397                         item_set(scroll + choice);
 398                         item_set_selected(1);
 399                         switch (key) {
 400                         case 'h':
 401                         case '?':
 402                                 return 2;
 403                         case 's':
 404                         case 'y':
 405                                 return 5;
 406                         case 'n':
 407                                 return 6;
 408                         case 'm':
 409                                 return 7;
 410                         case ' ':
 411                                 return 8;
 412                         case '/':
 413                                 return 9;
 414                         case 'z':
 415                                 return 10;
 416                         case '\n':
 417                                 return button;
 418                         }
 419                         return 0;
 420                 case 'e':
 421                 case 'x':
 422                         key = KEY_ESC;
 423                         break;
 424                 case KEY_ESC:
 425                         key = on_key_esc(menu);
 426                         break;
 427                 case KEY_RESIZE:
 428                         on_key_resize();
 429                         delwin(menu);
 430                         delwin(dialog);
 431                         goto do_resize;
 432                 }
 433         }
 434         delwin(menu);
 435         delwin(dialog);
 436         return key;             /* ESC pressed */
 437 }