scripts/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 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 - item_x);
  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         }
  97         free(menu_item);
  98         wrefresh(win);
  99 }
 100
 101 #define print_item(index, choice, selected) \
 102 do {\
 103         int hotkey = (items[(index) * 2][0] != ':'); \
 104         do_print_item(menu, items[(index) * 2 + 1], choice, selected, hotkey); \
 105 } while (0)
 106
 107 /*
 108  * Print the scroll indicators.
 109  */
 110 static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
 111                          int height)
 112 {
 113         int cur_y, cur_x;
 114
 115         getyx(win, cur_y, cur_x);
 116
 117         wmove(win, y, x);
 118
 119         if (scroll > 0) {
 120                 wattrset(win, uarrow_attr);
 121                 waddch(win, ACS_UARROW);
 122                 waddstr(win, "(-)");
 123         } else {
 124                 wattrset(win, menubox_attr);
 125                 waddch(win, ACS_HLINE);
 126                 waddch(win, ACS_HLINE);
 127                 waddch(win, ACS_HLINE);
 128                 waddch(win, ACS_HLINE);
 129         }
 130
 131         y = y + height + 1;
 132         wmove(win, y, x);
 133         wrefresh(win);
 134
 135         if ((height < item_no) && (scroll + height < item_no)) {
 136                 wattrset(win, darrow_attr);
 137                 waddch(win, ACS_DARROW);
 138                 waddstr(win, "(+)");
 139         } else {
 140                 wattrset(win, menubox_border_attr);
 141                 waddch(win, ACS_HLINE);
 142                 waddch(win, ACS_HLINE);
 143                 waddch(win, ACS_HLINE);
 144                 waddch(win, ACS_HLINE);
 145         }
 146
 147         wmove(win, cur_y, cur_x);
 148         wrefresh(win);
 149 }
 150
 151 /*
 152  * Display the termination buttons.
 153  */
 154 static void print_buttons(WINDOW * win, int height, int width, int selected)
 155 {
 156         int x = width / 2 - 16;
 157         int y = height - 2;
 158
 159         print_button(win, "Select", y, x, selected == 0);
 160         print_button(win, " Exit ", y, x + 12, selected == 1);
 161         print_button(win, " Help ", y, x + 24, selected == 2);
 162
 163         wmove(win, y, x + 1 + 12 * selected);
 164         wrefresh(win);
 165 }
 166
 167 /* scroll up n lines (n may be negative) */
 168 static void do_scroll(WINDOW *win, int *scroll, int n)
 169 {
 170         /* Scroll menu up */
 171         scrollok(win, TRUE);
 172         wscrl(win, n);
 173         scrollok(win, FALSE);
 174         *scroll = *scroll + n;
 175         wrefresh(win);
 176 }
 177
 178 /*
 179  * Display a menu for choosing among a number of options
 180  */
 181 int dialog_menu(const char *title, const char *prompt, int height, int width,
 182                 int menu_height, const char *current, int item_no,
 183                 const char *const *items)
 184 {
 185         int i, j, x, y, box_x, box_y;
 186         int key = 0, button = 0, scroll = 0, choice = 0;
 187         int first_item =  0, max_choice;
 188         WINDOW *dialog, *menu;
 189         FILE *f;
 190
 191         max_choice = MIN(menu_height, item_no);
 192
 193         /* center dialog box on screen */
 194         x = (COLS - width) / 2;
 195         y = (LINES - height) / 2;
 196
 197         draw_shadow(stdscr, y, x, height, width);
 198
 199         dialog = newwin(height, width, y, x);
 200         keypad(dialog, TRUE);
 201
 202         draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
 203         wattrset(dialog, border_attr);
 204         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
 205         for (i = 0; i < width - 2; i++)
 206                 waddch(dialog, ACS_HLINE);
 207         wattrset(dialog, dialog_attr);
 208         wbkgdset(dialog, dialog_attr & A_COLOR);
 209         waddch(dialog, ACS_RTEE);
 210
 211         print_title(dialog, title, width);
 212
 213         wattrset(dialog, dialog_attr);
 214         print_autowrap(dialog, prompt, width - 2, 1, 3);
 215
 216         menu_width = width - 6;
 217         box_y = height - menu_height - 5;
 218         box_x = (width - menu_width) / 2 - 1;
 219
 220         /* create new window for the menu */
 221         menu = subwin(dialog, menu_height, menu_width,
 222                       y + box_y + 1, x + box_x + 1);
 223         keypad(menu, TRUE);
 224
 225         /* draw a box around the menu items */
 226         draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
 227                  menubox_border_attr, menubox_attr);
 228
 229         item_x = (menu_width - 70) / 2;
 230
 231         /* Set choice to default item */
 232         for (i = 0; i < item_no; i++)
 233                 if (strcmp(current, items[i * 2]) == 0)
 234                         choice = i;
 235
 236         /* get the scroll info from the temp file */
 237         if ((f = fopen("lxdialog.scrltmp", "r")) != NULL) {
 238                 if ((fscanf(f, "%d\n", &scroll) == 1) && (scroll <= choice) &&
 239                     (scroll + max_choice > choice) && (scroll >= 0) &&
 240                     (scroll + max_choice <= item_no)) {
 241                         first_item = scroll;
 242                         choice = choice - scroll;
 243                         fclose(f);
 244                 } else {
 245                         scroll = 0;
 246                         remove("lxdialog.scrltmp");
 247                         fclose(f);
 248                         f = NULL;
 249                 }
 250         }
 251         if ((choice >= max_choice) || (f == NULL && choice >= max_choice / 2)) {
 252                 if (choice >= item_no - max_choice / 2)
 253                         scroll = first_item = item_no - max_choice;
 254                 else
 255                         scroll = first_item = choice - max_choice / 2;
 256                 choice = choice - scroll;
 257         }
 258
 259         /* Print the menu */
 260         for (i = 0; i < max_choice; i++) {
 261                 print_item(first_item + i, i, i == choice);
 262         }
 263
 264         wnoutrefresh(menu);
 265
 266         print_arrows(dialog, item_no, scroll,
 267                      box_y, box_x + item_x + 1, menu_height);
 268
 269         print_buttons(dialog, height, width, 0);
 270         wmove(menu, choice, item_x + 1);
 271         wrefresh(menu);
 272
 273         while (key != ESC) {
 274                 key = wgetch(menu);
 275
 276                 if (key < 256 && isalpha(key))
 277                         key = tolower(key);
 278
 279                 if (strchr("ynmh", key))
 280                         i = max_choice;
 281                 else {
 282                         for (i = choice + 1; i < max_choice; i++) {
 283                                 j = first_alpha(items[(scroll + i) * 2 + 1], "YyNnMmHh");
 284                                 if (key == tolower(items[(scroll + i) * 2 + 1][j]))
 285                                         break;
 286                         }
 287                         if (i == max_choice)
 288                                 for (i = 0; i < max_choice; i++) {
 289                                         j = first_alpha(items [(scroll + i) * 2 + 1], "YyNnMmHh");
 290                                         if (key == tolower(items[(scroll + i) * 2 + 1][j]))
 291                                                 break;
 292                                 }
 293                 }
 294
 295                 if (i < max_choice ||
 296                     key == KEY_UP || key == KEY_DOWN ||
 297                     key == '-' || key == '+' ||
 298                     key == KEY_PPAGE || key == KEY_NPAGE) {
 299                         /* Remove highligt of current item */
 300                         print_item(scroll + choice, choice, FALSE);
 301
 302                         if (key == KEY_UP || key == '-') {
 303                                 if (choice < 2 && scroll) {
 304                                         /* Scroll menu down */
 305                                         do_scroll(menu, &scroll, -1);
 306
 307                                         print_item(scroll, 0, FALSE);
 308                                 } else
 309                                         choice = MAX(choice - 1, 0);
 310
 311                         } else if (key == KEY_DOWN || key == '+') {
 312                                 print_item(scroll+choice, choice, FALSE);
 313
 314                                 if ((choice > max_choice - 3) &&
 315                                     (scroll + max_choice < item_no)) {
 316                                         /* Scroll menu up */
 317                                         do_scroll(menu, &scroll, 1);
 318
 319                                         print_item(scroll+max_choice - 1,
 320                                                    max_choice - 1, FALSE);
 321                                 } else
 322                                         choice = MIN(choice + 1, max_choice - 1);
 323
 324                         } else if (key == KEY_PPAGE) {
 325                                 scrollok(menu, TRUE);
 326                                 for (i = 0; (i < max_choice); i++) {
 327                                         if (scroll > 0) {
 328                                                 do_scroll(menu, &scroll, -1);
 329                                                 print_item(scroll, 0, FALSE);
 330                                         } else {
 331                                                 if (choice > 0)
 332                                                         choice--;
 333                                         }
 334                                 }
 335
 336                         } else if (key == KEY_NPAGE) {
 337                                 for (i = 0; (i < max_choice); i++) {
 338                                         if (scroll + max_choice < item_no) {
 339                                                 do_scroll(menu, &scroll, 1);
 340                                                 print_item(scroll+max_choice-1,
 341                                                            max_choice - 1, FALSE);
 342                                         } else {
 343                                                 if (choice + 1 < max_choice)
 344                                                         choice++;
 345                                         }
 346                                 }
 347                         } else
 348                                 choice = i;
 349
 350                         print_item(scroll + choice, choice, TRUE);
 351
 352                         print_arrows(dialog, item_no, scroll,
 353                                      box_y, box_x + item_x + 1, menu_height);
 354
 355                         wnoutrefresh(dialog);
 356                         wrefresh(menu);
 357
 358                         continue;       /* wait for another key press */
 359                 }
 360
 361                 switch (key) {
 362                 case KEY_LEFT:
 363                 case TAB:
 364                 case KEY_RIGHT:
 365                         button = ((key == KEY_LEFT ? --button : ++button) < 0)
 366                             ? 2 : (button > 2 ? 0 : button);
 367
 368                         print_buttons(dialog, height, width, button);
 369                         wrefresh(menu);
 370                         break;
 371                 case ' ':
 372                 case 's':
 373                 case 'y':
 374                 case 'n':
 375                 case 'm':
 376                 case '/':
 377                         /* save scroll info */
 378                         if ((f = fopen("lxdialog.scrltmp", "w")) != NULL) {
 379                                 fprintf(f, "%d\n", scroll);
 380                                 fclose(f);
 381                         }
 382                         delwin(dialog);
 383                         fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
 384                         switch (key) {
 385                         case 's':
 386                                 return 3;
 387                         case 'y':
 388                                 return 3;
 389                         case 'n':
 390                                 return 4;
 391                         case 'm':
 392                                 return 5;
 393                         case ' ':
 394                                 return 6;
 395                         case '/':
 396                                 return 7;
 397                         }
 398                         return 0;
 399                 case 'h':
 400                 case '?':
 401                         button = 2;
 402                 case '\n':
 403                         delwin(dialog);
 404                         if (button == 2)
 405                                 fprintf(stderr, "%s \"%s\"\n",
 406                                         items[(scroll + choice) * 2],
 407                                         items[(scroll + choice) * 2 + 1] +
 408                                         first_alpha(items [(scroll + choice) * 2 + 1], ""));
 409                         else
 410                                 fprintf(stderr, "%s\n",
 411                                         items[(scroll + choice) * 2]);
 412
 413                         remove("lxdialog.scrltmp");
 414                         return button;
 415                 case 'e':
 416                 case 'x':
 417                         key = ESC;
 418                 case ESC:
 419                         break;
 420                 }
 421         }
 422
 423         delwin(dialog);
 424         remove("lxdialog.scrltmp");
 425         return -1;              /* ESC pressed */
 426 }