scripts/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 print_item(WINDOW * win, const char *item, int choice,
  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);
  73         menu_item[menu_width] = 0;
  74         j = first_alpha(menu_item, "YyNnMmHh");
  75
  76         /* Clear 'residue' of last item */
  77         wattrset(win, menubox_attr);
  78         wmove(win, choice, 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 ? item_selected_attr : item_attr);
  89         mvwaddstr(win, choice, item_x, menu_item);
  90         if (hotkey) {
  91                 wattrset(win, selected ? tag_key_selected_attr : tag_key_attr);
  92                 mvwaddch(win, choice, item_x + j, menu_item[j]);
  93         }
  94         if (selected) {
  95                 wmove(win, choice, item_x + 1);
  96                 wrefresh(win);
  97         }
  98         free(menu_item);
  99 }
 100
 101 /*
 102  * Print the scroll indicators.
 103  */
 104 static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
 105                          int height)
 106 {
 107         int cur_y, cur_x;
 108
 109         getyx(win, cur_y, cur_x);
 110
 111         wmove(win, y, x);
 112
 113         if (scroll > 0) {
 114                 wattrset(win, uarrow_attr);
 115                 waddch(win, ACS_UARROW);
 116                 waddstr(win, "(-)");
 117         } else {
 118                 wattrset(win, menubox_attr);
 119                 waddch(win, ACS_HLINE);
 120                 waddch(win, ACS_HLINE);
 121                 waddch(win, ACS_HLINE);
 122                 waddch(win, ACS_HLINE);
 123         }
 124
 125         y = y + height + 1;
 126         wmove(win, y, x);
 127
 128         if ((height < item_no) && (scroll + height < item_no)) {
 129                 wattrset(win, darrow_attr);
 130                 waddch(win, ACS_DARROW);
 131                 waddstr(win, "(+)");
 132         } else {
 133                 wattrset(win, menubox_border_attr);
 134                 waddch(win, ACS_HLINE);
 135                 waddch(win, ACS_HLINE);
 136                 waddch(win, ACS_HLINE);
 137                 waddch(win, ACS_HLINE);
 138         }
 139
 140         wmove(win, cur_y, cur_x);
 141 }
 142
 143 /*
 144  * Display the termination buttons.
 145  */
 146 static void print_buttons(WINDOW * win, int height, int width, int selected)
 147 {
 148         int x = width / 2 - 16;
 149         int y = height - 2;
 150
 151         print_button(win, "Select", y, x, selected == 0);
 152         print_button(win, " Exit ", y, x + 12, selected == 1);
 153         print_button(win, " Help ", y, x + 24, selected == 2);
 154
 155         wmove(win, y, x + 1 + 12 * selected);
 156         wrefresh(win);
 157 }
 158
 159 /*
 160  * Display a menu for choosing among a number of options
 161  */
 162 int dialog_menu(const char *title, const char *prompt, int height, int width,
 163                 int menu_height, const char *current, int item_no,
 164                 const char *const *items)
 165 {
 166         int i, j, x, y, box_x, box_y;
 167         int key = 0, button = 0, scroll = 0, choice = 0, first_item =
 168             0, max_choice;
 169         WINDOW *dialog, *menu;
 170         FILE *f;
 171
 172         max_choice = MIN(menu_height, item_no);
 173
 174         /* center dialog box on screen */
 175         x = (COLS - width) / 2;
 176         y = (LINES - height) / 2;
 177
 178         draw_shadow(stdscr, y, x, height, width);
 179
 180         dialog = newwin(height, width, y, x);
 181         keypad(dialog, TRUE);
 182
 183         draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
 184         wattrset(dialog, border_attr);
 185         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
 186         for (i = 0; i < width - 2; i++)
 187                 waddch(dialog, ACS_HLINE);
 188         wattrset(dialog, dialog_attr);
 189         wbkgdset(dialog, dialog_attr & A_COLOR);
 190         waddch(dialog, ACS_RTEE);
 191
 192         if (title != NULL && strlen(title) >= width - 2) {
 193                 /* truncate long title -- mec */
 194                 char *title2 = malloc(width - 2 + 1);
 195                 memcpy(title2, title, width - 2);
 196                 title2[width - 2] = '\0';
 197                 title = title2;
 198         }
 199
 200         if (title != NULL) {
 201                 wattrset(dialog, title_attr);
 202                 mvwaddch(dialog, 0, (width - strlen(title)) / 2 - 1, ' ');
 203                 waddstr(dialog, (char *)title);
 204                 waddch(dialog, ' ');
 205         }
 206
 207         wattrset(dialog, dialog_attr);
 208         print_autowrap(dialog, prompt, width - 2, 1, 3);
 209
 210         menu_width = width - 6;
 211         box_y = height - menu_height - 5;
 212         box_x = (width - menu_width) / 2 - 1;
 213
 214         /* create new window for the menu */
 215         menu = subwin(dialog, menu_height, menu_width,
 216                       y + box_y + 1, x + box_x + 1);
 217         keypad(menu, TRUE);
 218
 219         /* draw a box around the menu items */
 220         draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
 221                  menubox_border_attr, menubox_attr);
 222
 223         /*
 224          * Find length of longest item in order to center menu.
 225          * Set 'choice' to default item.
 226          */
 227         item_x = 0;
 228         for (i = 0; i < item_no; i++) {
 229                 item_x =
 230                     MAX(item_x, MIN(menu_width, strlen(items[i * 2 + 1]) + 2));
 231                 if (strcmp(current, items[i * 2]) == 0)
 232                         choice = i;
 233         }
 234
 235         item_x = (menu_width - item_x) / 2;
 236
 237         /* get the scroll info from the temp file */
 238         if ((f = fopen("lxdialog.scrltmp", "r")) != NULL) {
 239                 if ((fscanf(f, "%d\n", &scroll) == 1) && (scroll <= choice) &&
 240                     (scroll + max_choice > choice) && (scroll >= 0) &&
 241                     (scroll + max_choice <= item_no)) {
 242                         first_item = scroll;
 243                         choice = choice - scroll;
 244                         fclose(f);
 245                 } else {
 246                         scroll = 0;
 247                         remove("lxdialog.scrltmp");
 248                         fclose(f);
 249                         f = NULL;
 250                 }
 251         }
 252         if ((choice >= max_choice) || (f == NULL && choice >= max_choice / 2)) {
 253                 if (choice >= item_no - max_choice / 2)
 254                         scroll = first_item = item_no - max_choice;
 255                 else
 256                         scroll = first_item = choice - max_choice / 2;
 257                 choice = choice - scroll;
 258         }
 259
 260         /* Print the menu */
 261         for (i = 0; i < max_choice; i++) {
 262                 print_item(menu, items[(first_item + i) * 2 + 1], i,
 263                            i == choice,
 264                            (items[(first_item + i) * 2][0] != ':'));
 265         }
 266
 267         wnoutrefresh(menu);
 268
 269         print_arrows(dialog, item_no, scroll,
 270                      box_y, box_x + item_x + 1, menu_height);
 271
 272         print_buttons(dialog, height, width, 0);
 273         wmove(menu, choice, item_x + 1);
 274         wrefresh(menu);
 275
 276         while (key != ESC) {
 277                 key = wgetch(menu);
 278
 279                 if (key < 256 && isalpha(key))
 280                         key = tolower(key);
 281
 282                 if (strchr("ynmh", key))
 283                         i = max_choice;
 284                 else {
 285                         for (i = choice + 1; i < max_choice; i++) {
 286                                 j = first_alpha(items[(scroll + i) * 2 + 1], "YyNnMmHh");
 287                                 if (key == tolower(items[(scroll + i) * 2 + 1][j]))
 288                                         break;
 289                         }
 290                         if (i == max_choice)
 291                                 for (i = 0; i < max_choice; i++) {
 292                                         j = first_alpha(items [(scroll + i) * 2 + 1], "YyNnMmHh");
 293                                         if (key == tolower(items[(scroll + i) * 2 + 1][j]))
 294                                                 break;
 295                                 }
 296                 }
 297
 298                 if (i < max_choice ||
 299                     key == KEY_UP || key == KEY_DOWN ||
 300                     key == '-' || key == '+' ||
 301                     key == KEY_PPAGE || key == KEY_NPAGE) {
 302
 303                         print_item(menu, items[(scroll + choice) * 2 + 1],
 304                                    choice, FALSE,
 305                                    (items[(scroll + choice) * 2][0] != ':'));
 306
 307                         if (key == KEY_UP || key == '-') {
 308                                 if (choice < 2 && scroll) {
 309                                         /* Scroll menu down */
 310                                         scrollok(menu, TRUE);
 311                                         wscrl(menu, -1);
 312                                         scrollok(menu, FALSE);
 313
 314                                         scroll--;
 315
 316                                         print_item(menu, items[scroll * 2 + 1], 0, FALSE,
 317                                                    (items[scroll * 2][0] != ':'));
 318                                 } else
 319                                         choice = MAX(choice - 1, 0);
 320
 321                         } else if (key == KEY_DOWN || key == '+') {
 322
 323                                 print_item(menu,
 324                                            items[(scroll + choice) * 2 + 1], choice, FALSE,
 325                                            (items[(scroll + choice) * 2][0] != ':'));
 326
 327                                 if ((choice > max_choice - 3) &&
 328                                     (scroll + max_choice < item_no)) {
 329                                         /* Scroll menu up */
 330                                         scrollok(menu, TRUE);
 331                                         wscrl(menu, 1);
 332                                         scrollok(menu, FALSE);
 333
 334                                         scroll++;
 335
 336                                         print_item(menu, items[(scroll + max_choice - 1) * 2 + 1],
 337                                                    max_choice - 1, FALSE,
 338                                                    (items [(scroll + max_choice - 1) * 2][0] != ':'));
 339                                 } else
 340                                         choice = MIN(choice + 1, max_choice - 1);
 341
 342                         } else if (key == KEY_PPAGE) {
 343                                 scrollok(menu, TRUE);
 344                                 for (i = 0; (i < max_choice); i++) {
 345                                         if (scroll > 0) {
 346                                                 wscrl(menu, -1);
 347                                                 scroll--;
 348                                                 print_item(menu, items[scroll * 2 + 1], 0, FALSE,
 349                                                            (items[scroll * 2][0] != ':'));
 350                                         } else {
 351                                                 if (choice > 0)
 352                                                         choice--;
 353                                         }
 354                                 }
 355                                 scrollok(menu, FALSE);
 356
 357                         } else if (key == KEY_NPAGE) {
 358                                 for (i = 0; (i < max_choice); i++) {
 359                                         if (scroll + max_choice < item_no) {
 360                                                 scrollok(menu, TRUE);
 361                                                 wscrl(menu, 1);
 362                                                 scrollok(menu, FALSE);
 363                                                 scroll++;
 364                                                 print_item(menu, items[(scroll + max_choice - 1) * 2 + 1],
 365                                                            max_choice - 1, FALSE,
 366                                                            (items [(scroll + max_choice - 1) * 2][0] != ':'));
 367                                         } else {
 368                                                 if (choice + 1 < max_choice)
 369                                                         choice++;
 370                                         }
 371                                 }
 372
 373                         } else
 374                                 choice = i;
 375
 376                         print_item(menu, items[(scroll + choice) * 2 + 1],
 377                                    choice, TRUE, (items[(scroll + choice) * 2][0] != ':'));
 378
 379                         print_arrows(dialog, item_no, scroll,
 380                                      box_y, box_x + item_x + 1, menu_height);
 381
 382                         wnoutrefresh(dialog);
 383                         wrefresh(menu);
 384
 385                         continue;       /* wait for another key press */
 386                 }
 387
 388                 switch (key) {
 389                 case KEY_LEFT:
 390                 case TAB:
 391                 case KEY_RIGHT:
 392                         button = ((key == KEY_LEFT ? --button : ++button) < 0)
 393                             ? 2 : (button > 2 ? 0 : button);
 394
 395                         print_buttons(dialog, height, width, button);
 396                         wrefresh(menu);
 397                         break;
 398                 case ' ':
 399                 case 's':
 400                 case 'y':
 401                 case 'n':
 402                 case 'm':
 403                 case '/':
 404                         /* save scroll info */
 405                         if ((f = fopen("lxdialog.scrltmp", "w")) != NULL) {
 406                                 fprintf(f, "%d\n", scroll);
 407                                 fclose(f);
 408                         }
 409                         delwin(dialog);
 410                         fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
 411                         switch (key) {
 412                         case 's':
 413                                 return 3;
 414                         case 'y':
 415                                 return 3;
 416                         case 'n':
 417                                 return 4;
 418                         case 'm':
 419                                 return 5;
 420                         case ' ':
 421                                 return 6;
 422                         case '/':
 423                                 return 7;
 424                         }
 425                         return 0;
 426                 case 'h':
 427                 case '?':
 428                         button = 2;
 429                 case '\n':
 430                         delwin(dialog);
 431                         if (button == 2)
 432                                 fprintf(stderr, "%s \"%s\"\n",
 433                                         items[(scroll + choice) * 2],
 434                                         items[(scroll + choice) * 2 + 1] +
 435                                         first_alpha(items [(scroll + choice) * 2 + 1], ""));
 436                         else
 437                                 fprintf(stderr, "%s\n",
 438                                         items[(scroll + choice) * 2]);
 439
 440                         remove("lxdialog.scrltmp");
 441                         return button;
 442                 case 'e':
 443                 case 'x':
 444                         key = ESC;
 445                 case ESC:
 446                         break;
 447                 }
 448         }
 449
 450         delwin(dialog);
 451         remove("lxdialog.scrltmp");
 452         return -1;              /* ESC pressed */
 453 }