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
  67 print_item (WINDOW * win, const char *item, int choice, int selected, int hotkey)
  68 {
  69     int j;
  70     char menu_item[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 }
  99
 100 /*
 101  * Print the scroll indicators.
 102  */
 103 static void
 104 print_arrows (WINDOW * win, int item_no, int scroll,
 105                 int y, int x, 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     }
 118     else {
 119         wattrset (win, menubox_attr);
 120         waddch (win, ACS_HLINE);
 121         waddch (win, ACS_HLINE);
 122         waddch (win, ACS_HLINE);
 123         waddch (win, ACS_HLINE);
 124     }
 125
 126    y = y + height + 1;
 127    wmove(win, y, x);
 128
 129    if ((height < item_no) && (scroll + height < item_no)) {
 130         wattrset (win, darrow_attr);
 131         waddch (win, ACS_DARROW);
 132         waddstr (win, "(+)");
 133     }
 134     else {
 135         wattrset (win, menubox_border_attr);
 136         waddch (win, ACS_HLINE);
 137         waddch (win, ACS_HLINE);
 138         waddch (win, ACS_HLINE);
 139         waddch (win, ACS_HLINE);
 140    }
 141
 142    wmove(win, cur_y, cur_x);
 143 }
 144
 145 /*
 146  * Display the termination buttons.
 147  */
 148 static void
 149 print_buttons (WINDOW *win, int height, int width, int selected)
 150 {
 151     int x = width / 2 - 16;
 152     int y = height - 2;
 153
 154     print_button (win, "Select", y, x, selected == 0);
 155     print_button (win, " Exit ", y, x + 12, selected == 1);
 156     print_button (win, " Help ", y, x + 24, selected == 2);
 157
 158     wmove(win, y, x+1+12*selected);
 159     wrefresh (win);
 160 }
 161
 162 /*
 163  * Display a menu for choosing among a number of options
 164  */
 165 int
 166 dialog_menu (const char *title, const char *prompt, int height, int width,
 167                 int menu_height, const char *current, int item_no,
 168                 const char * const * items)
 169
 170 {
 171     int i, j, x, y, box_x, box_y;
 172     int key = 0, button = 0, scroll = 0, choice = 0, first_item = 0, max_choice;
 173     WINDOW *dialog, *menu;
 174     FILE *f;
 175
 176     max_choice = MIN (menu_height, item_no);
 177
 178     /* center dialog box on screen */
 179     x = (COLS - width) / 2;
 180     y = (LINES - height) / 2;
 181
 182     draw_shadow (stdscr, y, x, height, width);
 183
 184     dialog = newwin (height, width, y, x);
 185     keypad (dialog, TRUE);
 186
 187     draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);
 188     wattrset (dialog, border_attr);
 189     mvwaddch (dialog, height - 3, 0, ACS_LTEE);
 190     for (i = 0; i < width - 2; i++)
 191         waddch (dialog, ACS_HLINE);
 192     wattrset (dialog, dialog_attr);
 193     wbkgdset (dialog, dialog_attr & A_COLOR);
 194     waddch (dialog, ACS_RTEE);
 195
 196     if (title != NULL && strlen(title) >= width-2 ) {
 197         /* truncate long title -- mec */
 198         char * title2 = malloc(width-2+1);
 199         memcpy( title2, title, width-2 );
 200         title2[width-2] = '\0';
 201         title = title2;
 202     }
 203
 204     if (title != NULL) {
 205         wattrset (dialog, title_attr);
 206         mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
 207         waddstr (dialog, (char *)title);
 208         waddch (dialog, ' ');
 209     }
 210
 211     wattrset (dialog, dialog_attr);
 212     print_autowrap (dialog, prompt, width - 2, 1, 3);
 213
 214     menu_width = width - 6;
 215     box_y = height - menu_height - 5;
 216     box_x = (width - menu_width) / 2 - 1;
 217
 218     /* create new window for the menu */
 219     menu = subwin (dialog, menu_height, menu_width,
 220                 y + box_y + 1, x + box_x + 1);
 221     keypad (menu, TRUE);
 222
 223     /* draw a box around the menu items */
 224     draw_box (dialog, box_y, box_x, menu_height + 2, menu_width + 2,
 225               menubox_border_attr, menubox_attr);
 226
 227     /*
 228      * Find length of longest item in order to center menu.
 229      * Set 'choice' to default item.
 230      */
 231     item_x = 0;
 232     for (i = 0; i < item_no; i++) {
 233         item_x = MAX (item_x, MIN(menu_width, strlen (items[i * 2 + 1]) + 2));
 234         if (strcmp(current, items[i*2]) == 0) choice = i;
 235     }
 236
 237     item_x = (menu_width - item_x) / 2;
 238
 239     /* get the scroll info from the temp file */
 240     if ( (f=fopen("lxdialog.scrltmp","r")) != NULL ) {
 241         if ( (fscanf(f,"%d\n",&scroll) == 1) && (scroll <= choice) &&
 242              (scroll+max_choice > choice) && (scroll >= 0) &&
 243              (scroll+max_choice <= item_no) ) {
 244             first_item = scroll;
 245             choice = choice - scroll;
 246             fclose(f);
 247         } else {
 248             scroll=0;
 249             remove("lxdialog.scrltmp");
 250             fclose(f);
 251             f=NULL;
 252         }
 253     }
 254     if ( (choice >= max_choice) || (f==NULL && choice >= max_choice/2) ) {
 255         if (choice >= item_no-max_choice/2)
 256             scroll = first_item = item_no-max_choice;
 257         else
 258             scroll = first_item = choice - max_choice/2;
 259         choice = choice - scroll;
 260     }
 261
 262     /* Print the menu */
 263     for (i=0; i < max_choice; i++) {
 264         print_item (menu, items[(first_item + i) * 2 + 1], i, i == choice,
 265                     (items[(first_item + i)*2][0] != ':'));
 266     }
 267
 268     wnoutrefresh (menu);
 269
 270     print_arrows(dialog, item_no, scroll,
 271                  box_y, box_x+item_x+1, menu_height);
 272
 273     print_buttons (dialog, height, width, 0);
 274     wmove (menu, choice, item_x+1);
 275     wrefresh (menu);
 276
 277     while (key != ESC) {
 278         key = wgetch(menu);
 279
 280         if (key < 256 && isalpha(key)) 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], choice, FALSE,
 304                        (items[(scroll+choice)*2][0] != ':'));
 305
 306             if (key == KEY_UP || key == '-') {
 307                 if (choice < 2 && scroll) {
 308                     /* Scroll menu down */
 309                     scrollok (menu, TRUE);
 310                     wscrl (menu, -1);
 311                     scrollok (menu, FALSE);
 312
 313                     scroll--;
 314
 315                     print_item (menu, items[scroll * 2 + 1], 0, FALSE,
 316                                (items[scroll*2][0] != ':'));
 317                 } else
 318                     choice = MAX(choice - 1, 0);
 319
 320             } else if (key == KEY_DOWN || key == '+')  {
 321
 322                 print_item (menu, items[(scroll+choice)*2+1], choice, FALSE,
 323                                 (items[(scroll+choice)*2][0] != ':'));
 324
 325                 if ((choice > max_choice-3) &&
 326                     (scroll + max_choice < item_no)
 327                    ) {
 328                     /* Scroll menu up */
 329                     scrollok (menu, TRUE);
 330                     wscrl (menu, 1);
 331                     scrollok (menu, FALSE);
 332
 333                     scroll++;
 334
 335                     print_item (menu, items[(scroll+max_choice-1)*2+1],
 336                                max_choice-1, FALSE,
 337                                (items[(scroll+max_choice-1)*2][0] != ':'));
 338                 } else
 339                     choice = MIN(choice+1, max_choice-1);
 340
 341             } else if (key == KEY_PPAGE) {
 342                 scrollok (menu, TRUE);
 343                 for (i=0; (i < max_choice); i++) {
 344                     if (scroll > 0) {
 345                         wscrl (menu, -1);
 346                         scroll--;
 347                         print_item (menu, items[scroll * 2 + 1], 0, FALSE,
 348                         (items[scroll*2][0] != ':'));
 349                     } else {
 350                         if (choice > 0)
 351                             choice--;
 352                     }
 353                 }
 354                 scrollok (menu, FALSE);
 355
 356             } else if (key == KEY_NPAGE) {
 357                 for (i=0; (i < max_choice); i++) {
 358                     if (scroll+max_choice < item_no) {
 359                         scrollok (menu, TRUE);
 360                         wscrl (menu, 1);
 361                         scrollok (menu, FALSE);
 362                         scroll++;
 363                         print_item (menu, items[(scroll+max_choice-1)*2+1],
 364                                     max_choice-1, FALSE,
 365                                     (items[(scroll+max_choice-1)*2][0] != ':'));
 366                     } else {
 367                         if (choice+1 < max_choice)
 368                             choice++;
 369                     }
 370                 }
 371
 372             } else
 373                 choice = i;
 374
 375             print_item (menu, items[(scroll+choice)*2+1], choice, TRUE,
 376                        (items[(scroll+choice)*2][0] != ':'));
 377
 378             print_arrows(dialog, item_no, scroll,
 379                          box_y, box_x+item_x+1, menu_height);
 380
 381             wnoutrefresh (dialog);
 382             wrefresh (menu);
 383
 384             continue;           /* wait for another key press */
 385         }
 386
 387         switch (key) {
 388         case KEY_LEFT:
 389         case TAB:
 390         case KEY_RIGHT:
 391             button = ((key == KEY_LEFT ? --button : ++button) < 0)
 392                         ? 2 : (button > 2 ? 0 : button);
 393
 394             print_buttons(dialog, height, width, button);
 395             wrefresh (menu);
 396             break;
 397         case ' ':
 398         case 's':
 399         case 'y':
 400         case 'n':
 401         case 'm':
 402         case '/':
 403             /* save scroll info */
 404             if ( (f=fopen("lxdialog.scrltmp","w")) != NULL ) {
 405                 fprintf(f,"%d\n",scroll);
 406                 fclose(f);
 407             }
 408             delwin (dialog);
 409             fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
 410             switch (key) {
 411             case 's': return 3;
 412             case 'y': return 3;
 413             case 'n': return 4;
 414             case 'm': return 5;
 415             case ' ': return 6;
 416             case '/': return 7;
 417             }
 418             return 0;
 419         case 'h':
 420         case '?':
 421             button = 2;
 422         case '\n':
 423             delwin (dialog);
 424             if (button == 2)
 425                 fprintf(stderr, "%s \"%s\"\n",
 426                         items[(scroll + choice) * 2],
 427                         items[(scroll + choice) * 2 + 1] +
 428                         first_alpha(items[(scroll + choice) * 2 + 1],""));
 429             else
 430                 fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
 431
 432             remove("lxdialog.scrltmp");
 433             return button;
 434         case 'e':
 435         case 'x':
 436             key = ESC;
 437         case ESC:
 438             break;
 439         }
 440     }
 441
 442     delwin (dialog);
 443     remove("lxdialog.scrltmp");
 444     return -1;                  /* ESC pressed */
 445 }