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 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 - 16;
 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
 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,
 183                 const void *selected, int *s_scroll)
 184 {
 185         int i, j, x, y, box_x, box_y;
 186         int height, width, menu_height;
 187         int key = 0, button = 0, scroll = 0, choice = 0;
 188         int first_item =  0, max_choice;
 189         WINDOW *dialog, *menu;
 190
 191 do_resize:
 192         height = getmaxy(stdscr);
 193         width = getmaxx(stdscr);
 194         if (height < 15 || width < 65)
 195                 return -ERRDISPLAYTOOSMALL;
 196
 197         height -= 4;
 198         width  -= 5;
 199         menu_height = height - 10;
 200
 201         max_choice = MIN(menu_height, item_count());
 202
 203         /* center dialog box on screen */
 204         x = (COLS - width) / 2;
 205         y = (LINES - height) / 2;
 206
 207         draw_shadow(stdscr, y, x, height, width);
 208
 209         dialog = newwin(height, width, y, x);
 210         keypad(dialog, TRUE);
 211
 212         draw_box(dialog, 0, 0, height, width,
 213                  dlg.dialog.atr, dlg.border.atr);
 214         wattrset(dialog, dlg.border.atr);
 215         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
 216         for (i = 0; i < width - 2; i++)
 217                 waddch(dialog, ACS_HLINE);
 218         wattrset(dialog, dlg.dialog.atr);
 219         wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
 220         waddch(dialog, ACS_RTEE);
 221
 222         print_title(dialog, title, width);
 223
 224         wattrset(dialog, dlg.dialog.atr);
 225         print_autowrap(dialog, prompt, width - 2, 1, 3);
 226
 227         menu_width = width - 6;
 228         box_y = height - menu_height - 5;
 229         box_x = (width - menu_width) / 2 - 1;
 230
 231         /* create new window for the menu */
 232         menu = subwin(dialog, menu_height, menu_width,
 233                       y + box_y + 1, x + box_x + 1);
 234         keypad(menu, TRUE);
 235
 236         /* draw a box around the menu items */
 237         draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
 238                  dlg.menubox_border.atr, dlg.menubox.atr);
 239
 240         if (menu_width >= 80)
 241                 item_x = (menu_width - 70) / 2;
 242         else
 243                 item_x = 4;
 244
 245         /* Set choice to default item */
 246         item_foreach()
 247                 if (selected && (selected == item_data()))
 248                         choice = item_n();
 249         /* get the saved scroll info */
 250         scroll = *s_scroll;
 251         if ((scroll <= choice) && (scroll + max_choice > choice) &&
 252            (scroll >= 0) && (scroll + max_choice <= item_count())) {
 253                 first_item = scroll;
 254                 choice = choice - scroll;
 255         } else {
 256                 scroll = 0;
 257         }
 258         if ((choice >= max_choice)) {
 259                 if (choice >= item_count() - max_choice / 2)
 260                         scroll = first_item = item_count() - max_choice;
 261                 else
 262                         scroll = first_item = choice - max_choice / 2;
 263                 choice = choice - scroll;
 264         }
 265
 266         /* Print the menu */
 267         for (i = 0; i < max_choice; i++) {
 268                 print_item(first_item + i, i, i == choice);
 269         }
 270
 271         wnoutrefresh(menu);
 272
 273         print_arrows(dialog, item_count(), scroll,
 274                      box_y, box_x + item_x + 1, menu_height);
 275
 276         print_buttons(dialog, height, width, 0);
 277         wmove(menu, choice, item_x + 1);
 278         wrefresh(menu);
 279
 280         while (key != KEY_ESC) {
 281                 key = wgetch(menu);
 282
 283                 if (key < 256 && isalpha(key))
 284                         key = tolower(key);
 285
 286                 if (strchr("ynmh", key))
 287                         i = max_choice;
 288                 else {
 289                         for (i = choice + 1; i < max_choice; i++) {
 290                                 item_set(scroll + i);
 291                                 j = first_alpha(item_str(), "YyNnMmHh");
 292                                 if (key == tolower(item_str()[j]))
 293                                         break;
 294                         }
 295                         if (i == max_choice)
 296                                 for (i = 0; i < max_choice; i++) {
 297                                         item_set(scroll + i);
 298                                         j = first_alpha(item_str(), "YyNnMmHh");
 299                                         if (key == tolower(item_str()[j]))
 300                                                 break;
 301                                 }
 302                 }
 303
 304                 if (i < max_choice ||
 305                     key == KEY_UP || key == KEY_DOWN ||
 306                     key == '-' || key == '+' ||
 307                     key == KEY_PPAGE || key == KEY_NPAGE) {
 308                         /* Remove highligt of current item */
 309                         print_item(scroll + choice, choice, FALSE);
 310
 311                         if (key == KEY_UP || key == '-') {
 312                                 if (choice < 2 && scroll) {
 313                                         /* Scroll menu down */
 314                                         do_scroll(menu, &scroll, -1);
 315
 316                                         print_item(scroll, 0, FALSE);
 317                                 } else
 318                                         choice = MAX(choice - 1, 0);
 319
 320                         } else if (key == KEY_DOWN || key == '+') {
 321                                 print_item(scroll+choice, choice, FALSE);
 322
 323                                 if ((choice > max_choice - 3) &&
 324                                     (scroll + max_choice < item_count())) {
 325                                         /* Scroll menu up */
 326                                         do_scroll(menu, &scroll, 1);
 327
 328                                         print_item(scroll+max_choice - 1,
 329                                                    max_choice - 1, FALSE);
 330                                 } else
 331                                         choice = MIN(choice + 1, max_choice - 1);
 332
 333                         } else if (key == KEY_PPAGE) {
 334                                 scrollok(menu, TRUE);
 335                                 for (i = 0; (i < max_choice); i++) {
 336                                         if (scroll > 0) {
 337                                                 do_scroll(menu, &scroll, -1);
 338                                                 print_item(scroll, 0, FALSE);
 339                                         } else {
 340                                                 if (choice > 0)
 341                                                         choice--;
 342                                         }
 343                                 }
 344
 345                         } else if (key == KEY_NPAGE) {
 346                                 for (i = 0; (i < max_choice); i++) {
 347                                         if (scroll + max_choice < item_count()) {
 348                                                 do_scroll(menu, &scroll, 1);
 349                                                 print_item(scroll+max_choice-1,
 350                                                            max_choice - 1, FALSE);
 351                                         } else {
 352                                                 if (choice + 1 < max_choice)
 353                                                         choice++;
 354                                         }
 355                                 }
 356                         } else
 357                                 choice = i;
 358
 359                         print_item(scroll + choice, choice, TRUE);
 360
 361                         print_arrows(dialog, item_count(), scroll,
 362                                      box_y, box_x + item_x + 1, menu_height);
 363
 364                         wnoutrefresh(dialog);
 365                         wrefresh(menu);
 366
 367                         continue;       /* wait for another key press */
 368                 }
 369
 370                 switch (key) {
 371                 case KEY_LEFT:
 372                 case TAB:
 373                 case KEY_RIGHT:
 374                         button = ((key == KEY_LEFT ? --button : ++button) < 0)
 375                             ? 2 : (button > 2 ? 0 : button);
 376
 377                         print_buttons(dialog, height, width, button);
 378                         wrefresh(menu);
 379                         break;
 380                 case ' ':
 381                 case 's':
 382                 case 'y':
 383                 case 'n':
 384                 case 'm':
 385                 case '/':
 386                         /* save scroll info */
 387                         *s_scroll = scroll;
 388                         delwin(menu);
 389                         delwin(dialog);
 390                         item_set(scroll + choice);
 391                         item_set_selected(1);
 392                         switch (key) {
 393                         case 's':
 394                                 return 3;
 395                         case 'y':
 396                                 return 3;
 397                         case 'n':
 398                                 return 4;
 399                         case 'm':
 400                                 return 5;
 401                         case ' ':
 402                                 return 6;
 403                         case '/':
 404                                 return 7;
 405                         }
 406                         return 0;
 407                 case 'h':
 408                 case '?':
 409                         button = 2;
 410                 case '\n':
 411                         *s_scroll = scroll;
 412                         delwin(menu);
 413                         delwin(dialog);
 414                         item_set(scroll + choice);
 415                         item_set_selected(1);
 416                         return button;
 417                 case 'e':
 418                 case 'x':
 419                         key = KEY_ESC;
 420                         break;
 421                 case KEY_ESC:
 422                         key = on_key_esc(menu);
 423                         break;
 424                 case KEY_RESIZE:
 425                         on_key_resize();
 426                         delwin(menu);
 427                         delwin(dialog);
 428                         goto do_resize;
 429                 }
 430         }
 431         delwin(menu);
 432         delwin(dialog);
 433         return key;             /* ESC pressed */
 434 }