package/config/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, "YyNnMm");
  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                 struct dialog_list_item ** items)
 169 {
 170     int i, j, x, y, box_x, box_y;
 171     int key = 0, button = 0, scroll = 0, choice = 0, first_item = 0, max_choice;
 172     WINDOW *dialog, *menu;
 173     FILE *f;
 174
 175     max_choice = MIN (menu_height, item_no);
 176
 177     /* center dialog box on screen */
 178     x = (COLS - width) / 2;
 179     y = (LINES - height) / 2;
 180
 181     draw_shadow (stdscr, y, x, height, width);
 182
 183     dialog = newwin (height, width, y, x);
 184     keypad (dialog, TRUE);
 185
 186     draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);
 187     wattrset (dialog, border_attr);
 188     mvwaddch (dialog, height - 3, 0, ACS_LTEE);
 189     for (i = 0; i < width - 2; i++)
 190         waddch (dialog, ACS_HLINE);
 191     wattrset (dialog, dialog_attr);
 192     wbkgdset (dialog, dialog_attr & A_COLOR);
 193     waddch (dialog, ACS_RTEE);
 194
 195     if (title != NULL && strlen(title) >= width-2 ) {
 196         /* truncate long title -- mec */
 197         char * title2 = malloc(width-2+1);
 198         memcpy( title2, title, width-2 );
 199         title2[width-2] = '\0';
 200         title = title2;
 201     }
 202
 203     if (title != NULL) {
 204         wattrset (dialog, title_attr);
 205         mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
 206         waddstr (dialog, (char *)title);
 207         waddch (dialog, ' ');
 208     }
 209
 210     wattrset (dialog, dialog_attr);
 211     print_autowrap (dialog, prompt, width - 2, 1, 3);
 212
 213     menu_width = width - 6;
 214     box_y = height - menu_height - 5;
 215     box_x = (width - menu_width) / 2 - 1;
 216
 217     /* create new window for the menu */
 218     menu = subwin (dialog, menu_height, menu_width,
 219                 y + box_y + 1, x + box_x + 1);
 220     keypad (menu, TRUE);
 221
 222     /* draw a box around the menu items */
 223     draw_box (dialog, box_y, box_x, menu_height + 2, menu_width + 2,
 224               menubox_border_attr, menubox_attr);
 225
 226     /*
 227      * Find length of longest item in order to center menu.
 228      * Set 'choice' to default item.
 229      */
 230     item_x = 0;
 231     for (i = 0; i < item_no; i++) {
 232         item_x = MAX (item_x, MIN(menu_width, strlen (items[i]->name) + 2));
 233         if (strcmp(current, items[i]->tag) == 0) choice = i;
 234     }
 235
 236     item_x = (menu_width - item_x) / 2;
 237
 238     /* get the scroll info from the temp file */
 239     if ( (f=fopen("lxdialog.scrltmp","r")) != NULL ) {
 240         if ( (fscanf(f,"%d\n",&scroll) == 1) && (scroll <= choice) &&
 241              (scroll+max_choice > choice) && (scroll >= 0) &&
 242              (scroll+max_choice <= item_no) ) {
 243             first_item = scroll;
 244             choice = choice - scroll;
 245             fclose(f);
 246         } else {
 247             scroll=0;
 248             remove("lxdialog.scrltmp");
 249             fclose(f);
 250             f=NULL;
 251         }
 252     }
 253     if ( (choice >= max_choice) || (f==NULL && choice >= max_choice/2) ) {
 254         if (choice >= item_no-max_choice/2)
 255             scroll = first_item = item_no-max_choice;
 256         else
 257             scroll = first_item = choice - max_choice/2;
 258         choice = choice - scroll;
 259     }
 260
 261     /* Print the menu */
 262     for (i=0; i < max_choice; i++) {
 263         print_item (menu, items[first_item + i]->name, i, i == choice,
 264                     (items[first_item + i]->tag[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)) key = tolower(key);
 280
 281         if (strchr("ynm", key))
 282                 i = max_choice;
 283         else {
 284         for (i = choice+1; i < max_choice; i++) {
 285                 j = first_alpha(items[scroll + i]->name, "YyNnMm>");
 286                 if (key == tolower(items[scroll + i]->name[j]))
 287                         break;
 288         }
 289         if (i == max_choice)
 290                 for (i = 0; i < max_choice; i++) {
 291                         j = first_alpha(items[scroll + i]->name, "YyNnMm>");
 292                         if (key == tolower(items[scroll + i]->name[j]))
 293                                 break;
 294                 }
 295         }
 296
 297         if (i < max_choice ||
 298             key == KEY_UP || key == KEY_DOWN ||
 299             key == '-' || key == '+' ||
 300             key == KEY_PPAGE || key == KEY_NPAGE) {
 301
 302             print_item (menu, items[scroll + choice]->name, choice, FALSE,
 303                        (items[scroll + choice]->tag[0] != ':'));
 304
 305             if (key == KEY_UP || key == '-') {
 306                 if (choice < 2 && scroll) {
 307                     /* Scroll menu down */
 308                     scrollok (menu, TRUE);
 309                     wscrl (menu, -1);
 310                     scrollok (menu, FALSE);
 311
 312                     scroll--;
 313
 314                     print_item (menu, items[scroll]->name, 0, FALSE,
 315                                (items[scroll]->tag[0] != ':'));
 316                 } else
 317                     choice = MAX(choice - 1, 0);
 318
 319             } else if (key == KEY_DOWN || key == '+')  {
 320
 321                 print_item (menu, items[scroll + choice]->name, choice, FALSE,
 322                                 (items[scroll + choice]->tag[0] != ':'));
 323
 324                 if ((choice > max_choice-3) &&
 325                     (scroll + max_choice < item_no)
 326                    ) {
 327                     /* Scroll menu up */
 328                     scrollok (menu, TRUE);
 329                     scroll (menu);
 330                     scrollok (menu, FALSE);
 331
 332                     scroll++;
 333
 334                     print_item (menu, items[scroll + max_choice - 1]->name,
 335                                max_choice-1, FALSE,
 336                                (items[scroll + max_choice - 1]->tag[0] != ':'));
 337                 } else
 338                     choice = MIN(choice+1, max_choice-1);
 339
 340             } else if (key == KEY_PPAGE) {
 341                 scrollok (menu, TRUE);
 342                 for (i=0; (i < max_choice); i++) {
 343                     if (scroll > 0) {
 344                         wscrl (menu, -1);
 345                         scroll--;
 346                         print_item (menu, items[scroll]->name, 0, FALSE,
 347                         (items[scroll]->tag[0] != ':'));
 348                     } else {
 349                         if (choice > 0)
 350                             choice--;
 351                     }
 352                 }
 353                 scrollok (menu, FALSE);
 354
 355             } else if (key == KEY_NPAGE) {
 356                 for (i=0; (i < max_choice); i++) {
 357                     if (scroll+max_choice < item_no) {
 358                         scrollok (menu, TRUE);
 359                         scroll(menu);
 360                         scrollok (menu, FALSE);
 361                         scroll++;
 362                         print_item (menu, items[scroll + max_choice - 1]->name,
 363                                     max_choice-1, FALSE,
 364                                     (items[scroll + max_choice - 1]->tag[0] != ':'));
 365                     } else {
 366                         if (choice+1 < max_choice)
 367                             choice++;
 368                     }
 369                 }
 370
 371             } else
 372                 choice = i;
 373
 374             print_item (menu, items[scroll + choice]->name, choice, TRUE,
 375                        (items[scroll + choice]->tag[0] != ':'));
 376
 377             print_arrows(dialog, item_no, scroll,
 378                          box_y, box_x+item_x+1, menu_height);
 379
 380             wnoutrefresh (dialog);
 381             wrefresh (menu);
 382
 383             continue;           /* wait for another key press */
 384         }
 385
 386         switch (key) {
 387         case KEY_LEFT:
 388         case TAB:
 389         case KEY_RIGHT:
 390             button = ((key == KEY_LEFT ? --button : ++button) < 0)
 391                         ? 2 : (button > 2 ? 0 : button);
 392
 393             print_buttons(dialog, height, width, button);
 394             wrefresh (menu);
 395             break;
 396         case ' ':
 397         case 's':
 398         case 'y':
 399         case 'n':
 400         case 'm':
 401             /* save scroll info */
 402             if ( (f=fopen("lxdialog.scrltmp","w")) != NULL ) {
 403                 fprintf(f,"%d\n",scroll);
 404                 fclose(f);
 405             }
 406             delwin (dialog);
 407             items[scroll + choice]->selected = 1;
 408             switch (key) {
 409             case 's': return 3;
 410             case 'y': return 3;
 411             case 'n': return 4;
 412             case 'm': return 5;
 413             case ' ': return 6;
 414             }
 415             return 0;
 416         case 'h':
 417         case '?':
 418             button = 2;
 419         case '\n':
 420             delwin (dialog);
 421             items[scroll + choice]->selected = 1;
 422
 423             remove("lxdialog.scrltmp");
 424             return button;
 425         case 'e':
 426         case 'x':
 427             key = ESC;
 428         case ESC:
 429             break;
 430         }
 431     }
 432
 433     delwin (dialog);
 434     remove("lxdialog.scrltmp");
 435     return -1;                  /* ESC pressed */
 436 }