scripts/config/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 #define ITEM_IDENT 1   /* Indent of menu entries. Fixed for all menus */
  62 static int menu_width;
  63
  64 /*
  65  * Print menu item
  66  */
  67 static void do_print_item(WINDOW * win, const char *item, int choice,
  68                           int selected, int hotkey)
  69 {
  70         int j;
  71         char *menu_item = malloc(menu_width + 1);
  72
  73         strncpy(menu_item, item, menu_width - ITEM_IDENT);
  74         menu_item[menu_width] = 0;
  75         j = first_alpha(menu_item, "YyNnMmHh");
  76
  77         /* Clear 'residue' of last item */
  78         wattrset(win, menubox_attr);
  79         wmove(win, choice, 0);
  80 #if OLD_NCURSES
  81         {
  82                 int i;
  83                 for (i = 0; i < menu_width; i++)
  84                         waddch(win, ' ');
  85         }
  86 #else
  87         wclrtoeol(win);
  88 #endif
  89         wattrset(win, selected ? item_selected_attr : item_attr);
  90         mvwaddstr(win, choice, ITEM_IDENT, menu_item);
  91         if (hotkey) {
  92                 wattrset(win, selected ? tag_key_selected_attr : tag_key_attr);
  93                 mvwaddch(win, choice, ITEM_IDENT + j, menu_item[j]);
  94         }
  95         if (selected) {
  96                 wmove(win, choice, ITEM_IDENT + 1);
  97         }
  98         free(menu_item);
  99         wrefresh(win);
 100 }
 101
 102 #define print_item(index, choice, selected) \
 103 do {\
 104         int hotkey = (items[(index) * 2][0] != ':'); \
 105         do_print_item(menu, items[(index) * 2 + 1], choice, selected, hotkey); \
 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, uarrow_attr);
 122                 waddch(win, ACS_UARROW);
 123                 waddstr(win, "(-)");
 124         } else {
 125                 wattrset(win, menubox_attr);
 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, darrow_attr);
 138                 waddch(win, ACS_DARROW);
 139                 waddstr(win, "(+)");
 140         } else {
 141                 wattrset(win, menubox_border_attr);
 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 - 16;
 158         int y = height - 2;
 159
 160         print_button(win, "Select", y, x, selected == 0);
 161         print_button(win, " Exit ", y, x + 12, selected == 1);
 162         print_button(win, " Help ", y, x + 24, selected == 2);
 163
 164         wmove(win, y, x + 1 + 12 * selected);
 165         wrefresh(win);
 166 }
 167
 168 /* scroll up n lines (n may be negative) */
 169 static void do_scroll(WINDOW *win, int *scroll, int n)
 170 {
 171         /* Scroll menu up */
 172         scrollok(win, TRUE);
 173         wscrl(win, n);
 174         scrollok(win, FALSE);
 175         *scroll = *scroll + n;
 176         wrefresh(win);
 177 }
 178
 179 /*
 180  * Display a menu for choosing among a number of options
 181  */
 182 int dialog_menu(const char *title, const char *prompt, int height, int width,
 183                 int menu_height, const char *current, int item_no,
 184                 const char *const *items)
 185 {
 186         int i, j, x, y, box_x, box_y;
 187         int key = 0, button = 0, scroll = 0, choice = 0;
 188         int first_item =  0, max_choice;
 189         WINDOW *dialog, *menu;
 190         FILE *f;
 191
 192         max_choice = MIN(menu_height, item_no);
 193
 194         /* center dialog box on screen */
 195         x = (COLS - width) / 2;
 196         y = (LINES - height) / 2;
 197
 198         draw_shadow(stdscr, y, x, height, width);
 199
 200         dialog = newwin(height, width, y, x);
 201         keypad(dialog, TRUE);
 202
 203         draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
 204         wattrset(dialog, border_attr);
 205         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
 206         for (i = 0; i < width - 2; i++)
 207                 waddch(dialog, ACS_HLINE);
 208         wattrset(dialog, dialog_attr);
 209         wbkgdset(dialog, dialog_attr & A_COLOR);
 210         waddch(dialog, ACS_RTEE);
 211
 212         print_title(dialog, title, width);
 213
 214         wattrset(dialog, dialog_attr);
 215         print_autowrap(dialog, prompt, width - 2, 1, 3);
 216
 217         menu_width = width - 6;
 218         box_y = height - menu_height - 5;
 219         box_x = (width - menu_width) / 2 - 1;
 220
 221         /* create new window for the menu */
 222         menu = subwin(dialog, menu_height, menu_width,
 223                       y + box_y + 1, x + box_x + 1);
 224         keypad(menu, TRUE);
 225
 226         /* draw a box around the menu items */
 227         draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
 228                  menubox_border_attr, menubox_attr);
 229
 230         /* Set choice to default item */
 231         for (i = 0; i < item_no; i++)
 232                 if (strcmp(current, items[i * 2]) == 0)
 233                         choice = i;
 234
 235         /* get the scroll info from the temp file */
 236         if ((f = fopen("lxdialog.scrltmp", "r")) != NULL) {
 237                 if ((fscanf(f, "%d\n", &scroll) == 1) && (scroll <= choice) &&
 238                     (scroll + max_choice > choice) && (scroll >= 0) &&
 239                     (scroll + max_choice <= item_no)) {
 240                         first_item = scroll;
 241                         choice = choice - scroll;
 242                         fclose(f);
 243                 } else {
 244                         scroll = 0;
 245                         remove("lxdialog.scrltmp");
 246                         fclose(f);
 247                         f = NULL;
 248                 }
 249         }
 250         if ((choice >= max_choice) || (f == NULL && choice >= max_choice / 2)) {
 251                 if (choice >= item_no - max_choice / 2)
 252                         scroll = first_item = item_no - max_choice;
 253                 else
 254                         scroll = first_item = choice - max_choice / 2;
 255                 choice = choice - scroll;
 256         }
 257
 258         /* Print the menu */
 259         for (i = 0; i < max_choice; i++) {
 260                 print_item(first_item + i, i, i == choice);
 261         }
 262
 263         wnoutrefresh(menu);
 264
 265         print_arrows(dialog, item_no, scroll,
 266                      box_y, box_x + ITEM_IDENT + 1, menu_height);
 267
 268         print_buttons(dialog, height, width, 0);
 269         wmove(menu, choice, ITEM_IDENT + 1);
 270         wrefresh(menu);
 271
 272         while (key != ESC) {
 273                 key = wgetch(menu);
 274
 275                 if (key < 256 && isalpha(key))
 276                         key = tolower(key);
 277
 278                 if (strchr("ynmh", key))
 279                         i = max_choice;
 280                 else {
 281                         for (i = choice + 1; i < max_choice; i++) {
 282                                 j = first_alpha(items[(scroll + i) * 2 + 1], "YyNnMmHh");
 283                                 if (key == tolower(items[(scroll + i) * 2 + 1][j]))
 284                                         break;
 285                         }
 286                         if (i == max_choice)
 287                                 for (i = 0; i < max_choice; i++) {
 288                                         j = first_alpha(items [(scroll + i) * 2 + 1], "YyNnMmHh");
 289                                         if (key == tolower(items[(scroll + i) * 2 + 1][j]))
 290                                                 break;
 291                                 }
 292                 }
 293
 294                 if (i < max_choice ||
 295                     key == KEY_UP || key == KEY_DOWN ||
 296                     key == '-' || key == '+' ||
 297                     key == KEY_PPAGE || key == KEY_NPAGE) {
 298                         /* Remove highligt of current item */
 299                         print_item(scroll + choice, choice, FALSE);
 300
 301                         if (key == KEY_UP || key == '-') {
 302                                 if (choice < 2 && scroll) {
 303                                         /* Scroll menu down */
 304                                         do_scroll(menu, &scroll, -1);
 305
 306                                         print_item(scroll, 0, FALSE);
 307                                 } else
 308                                         choice = MAX(choice - 1, 0);
 309
 310                         } else if (key == KEY_DOWN || key == '+') {
 311                                 print_item(scroll+choice, choice, FALSE);
 312
 313                                 if ((choice > max_choice - 3) &&
 314                                     (scroll + max_choice < item_no)) {
 315                                         /* Scroll menu up */
 316                                         do_scroll(menu, &scroll, 1);
 317
 318                                         print_item(scroll+max_choice - 1,
 319                                                    max_choice - 1, FALSE);
 320                                 } else
 321                                         choice = MIN(choice + 1, max_choice - 1);
 322
 323                         } else if (key == KEY_PPAGE) {
 324                                 scrollok(menu, TRUE);
 325                                 for (i = 0; (i < max_choice); i++) {
 326                                         if (scroll > 0) {
 327                                                 do_scroll(menu, &scroll, -1);
 328                                                 print_item(scroll, 0, FALSE);
 329                                         } else {
 330                                                 if (choice > 0)
 331                                                         choice--;
 332                                         }
 333                                 }
 334
 335                         } else if (key == KEY_NPAGE) {
 336                                 for (i = 0; (i < max_choice); i++) {
 337                                         if (scroll + max_choice < item_no) {
 338                                                 do_scroll(menu, &scroll, 1);
 339                                                 print_item(scroll+max_choice-1,
 340                                                            max_choice - 1, FALSE);
 341                                         } else {
 342                                                 if (choice + 1 < max_choice)
 343                                                         choice++;
 344                                         }
 345                                 }
 346                         } else
 347                                 choice = i;
 348
 349                         print_item(scroll + choice, choice, TRUE);
 350
 351                         print_arrows(dialog, item_no, scroll,
 352                                      box_y, box_x + ITEM_IDENT + 1, menu_height);
 353
 354                         wnoutrefresh(dialog);
 355                         wrefresh(menu);
 356
 357                         continue;       /* wait for another key press */
 358                 }
 359
 360                 switch (key) {
 361                 case KEY_LEFT:
 362                 case TAB:
 363                 case KEY_RIGHT:
 364                         button = ((key == KEY_LEFT ? --button : ++button) < 0)
 365                             ? 2 : (button > 2 ? 0 : button);
 366
 367                         print_buttons(dialog, height, width, button);
 368                         wrefresh(menu);
 369                         break;
 370                 case ' ':
 371                 case 's':
 372                 case 'y':
 373                 case 'n':
 374                 case 'm':
 375                 case '/':
 376                         /* save scroll info */
 377                         if ((f = fopen("lxdialog.scrltmp", "w")) != NULL) {
 378                                 fprintf(f, "%d\n", scroll);
 379                                 fclose(f);
 380                         }
 381                         delwin(dialog);
 382                         fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
 383                         switch (key) {
 384                         case 's':
 385                                 return 3;
 386                         case 'y':
 387                                 return 3;
 388                         case 'n':
 389                                 return 4;
 390                         case 'm':
 391                                 return 5;
 392                         case ' ':
 393                                 return 6;
 394                         case '/':
 395                                 return 7;
 396                         }
 397                         return 0;
 398                 case 'h':
 399                 case '?':
 400                         button = 2;
 401                 case '\n':
 402                         delwin(dialog);
 403                         if (button == 2)
 404                                 fprintf(stderr, "%s \"%s\"\n",
 405                                         items[(scroll + choice) * 2],
 406                                         items[(scroll + choice) * 2 + 1] +
 407                                         first_alpha(items [(scroll + choice) * 2 + 1], ""));
 408                         else
 409                                 fprintf(stderr, "%s\n",
 410                                         items[(scroll + choice) * 2]);
 411
 412                         remove("lxdialog.scrltmp");
 413                         return button;
 414                 case 'e':
 415                 case 'x':
 416                         key = ESC;
 417                 case ESC:
 418                         break;
 419                 }
 420         }
 421
 422         delwin(dialog);
 423         remove("lxdialog.scrltmp");
 424         return -1;              /* ESC pressed */
 425 }