scripts/lxdialog/checklist.c

/* */
This source file includes following definitions.
print_item
print_arrows
print_buttons
dialog_checklist
   1 /*
   2  *  checklist.c -- implements the checklist box
   3  *
   4  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
   5  *     Stuart Herbert - S.Herbert@sheffield.ac.uk: radiolist extension
   6  *     Alessandro Rubini - rubini@ipvvis.unipv.it: merged the two
   7  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
   8  *
   9  *  This program is free software; you can redistribute it and/or
  10  *  modify it under the terms of the GNU General Public License
  11  *  as published by the Free Software Foundation; either version 2
  12  *  of the License, or (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23 
  24 #include "dialog.h"
  25 
  26 static int list_width, check_x, item_x, checkflag;
  27 
  28 /*
  29  * Print list item
  30  */
  31 static void
  32 print_item (WINDOW * win, const char *item, int status,
     /*  */
  33             int choice, int selected)
  34 {
  35     int i;
  36 
  37     /* Clear 'residue' of last item */
  38     wattrset (win, menubox_attr);
  39     wmove (win, choice, 0);
  40     for (i = 0; i < list_width; i++)
  41         waddch (win, ' ');
  42 
  43     wmove (win, choice, check_x);
  44     wattrset (win, selected ? check_selected_attr : check_attr);
  45     if (checkflag == FLAG_CHECK)
  46         wprintw (win, "[%c]", status ? 'X' : ' ');
  47     else
  48         wprintw (win, "(%c)", status ? 'X' : ' ');
  49 
  50     wattrset (win, selected ? tag_selected_attr : tag_attr);
  51     mvwaddch(win, choice, item_x, item[0]);
  52     wattrset (win, selected ? item_selected_attr : item_attr);
  53     waddstr (win, (char *)item+1);
  54 }
  55 
  56 /*
  57  * Print the scroll indicators.
  58  */
  59 static void
  60 print_arrows (WINDOW * win, int choice, int item_no, int scroll,
     /*  */
  61                 int y, int x, int height)
  62 {
  63     wmove(win, y, x);
  64 
  65     if (scroll > 0) {
  66         wattrset (win, uarrow_attr);
  67         waddch (win, ACS_UARROW);
  68         waddstr (win, "(-)");
  69     }
  70     else {
  71         wattrset (win, menubox_attr);
  72         waddch (win, ACS_HLINE);
  73         waddch (win, ACS_HLINE);
  74         waddch (win, ACS_HLINE);
  75         waddch (win, ACS_HLINE);
  76     }
  77 
  78    y = y + height + 1;
  79    wmove(win, y, x);
  80 
  81    if ((height < item_no) && (scroll + choice < item_no - 1)) {
  82         wattrset (win, darrow_attr);
  83         waddch (win, ACS_DARROW);
  84         waddstr (win, "(+)");
  85     }
  86     else {
  87         wattrset (win, menubox_border_attr);
  88         waddch (win, ACS_HLINE);
  89         waddch (win, ACS_HLINE);
  90         waddch (win, ACS_HLINE);
  91         waddch (win, ACS_HLINE);
  92    }
  93 }
  94 
  95 /*
  96  *  Display the termination buttons
  97  */
  98 static void
  99 print_buttons( WINDOW *dialog, int height, int width, int selected)
     /*  */
 100 {
 101     int x = width / 2 - 11;
 102     int y = height - 2;
 103 
 104     print_button (dialog, "Select", y, x, selected == 0);
 105     print_button (dialog, " Help ", y, x + 14, selected == 1);
 106 
 107     wmove(dialog, y, x+1 + 14*selected);
 108     wrefresh (dialog);
 109 }
 110 
 111 /*
 112  * Display a dialog box with a list of options that can be turned on or off
 113  * The `flag' parameter is used to select between radiolist and checklist.
 114  */
 115 int
 116 dialog_checklist (const char *title, const char *prompt, int height, int width,
     /*  */
 117         int list_height, int item_no, const char * const * items, int flag)
 118         
 119 {
 120     int i, x, y, box_x, box_y;
 121     int key = 0, button = 0, choice = 0, scroll = 0, max_choice, *status;
 122     WINDOW *dialog, *list;
 123 
 124     checkflag = flag;
 125 
 126     /* Allocate space for storing item on/off status */
 127     if ((status = malloc (sizeof (int) * item_no)) == NULL) {
 128         endwin ();
 129         fprintf (stderr,
 130                  "\nCan't allocate memory in dialog_checklist().\n");
 131         exit (-1);
 132     }
 133 
 134     /* Initializes status */
 135     for (i = 0; i < item_no; i++) {
 136         status[i] = !strcasecmp (items[i * 3 + 2], "on");
 137         if (!choice && status[i])
 138             choice = i;
 139     }
 140 
 141     max_choice = MIN (list_height, item_no);
 142 
 143     /* center dialog box on screen */
 144     x = (COLS - width) / 2;
 145     y = (LINES - height) / 2;
 146 
 147     draw_shadow (stdscr, y, x, height, width);
 148 
 149     dialog = newwin (height, width, y, x);
 150     keypad (dialog, TRUE);
 151 
 152     draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);
 153     wattrset (dialog, border_attr);
 154     mvwaddch (dialog, height-3, 0, ACS_LTEE);
 155     for (i = 0; i < width - 2; i++)
 156         waddch (dialog, ACS_HLINE);
 157     wattrset (dialog, dialog_attr);
 158     waddch (dialog, ACS_RTEE);
 159 
 160     if (title != NULL) {
 161         wattrset (dialog, title_attr);
 162         mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
 163         waddstr (dialog, (char *)title);
 164         waddch (dialog, ' ');
 165     }
 166 
 167     wattrset (dialog, dialog_attr);
 168     print_autowrap (dialog, prompt, width - 2, 1, 3);
 169 
 170     list_width = width - 6;
 171     box_y = height - list_height - 5;
 172     box_x = (width - list_width) / 2 - 1;
 173 
 174     /* create new window for the list */
 175     list = subwin (dialog, list_height, list_width, y+box_y+1, x+box_x+1);
 176 
 177     keypad (list, TRUE);
 178 
 179     /* draw a box around the list items */
 180     draw_box (dialog, box_y, box_x, list_height + 2, list_width + 2,
 181               menubox_border_attr, menubox_attr);
 182 
 183     /* Find length of longest item in order to center checklist */
 184     check_x = 0;
 185     for (i = 0; i < item_no; i++) 
 186         check_x = MAX (check_x, + strlen (items[i * 3 + 1]) + 4);
 187 
 188     check_x = (list_width - check_x) / 2;
 189     item_x = check_x + 4;
 190 
 191     /* Print the list */
 192     for (i = 0; i < max_choice; i++)
 193         print_item (list, items[i * 3 + 1], status[i], i, i == choice);
 194 
 195     wnoutrefresh (list);
 196 
 197     print_arrows(dialog, choice, item_no, scroll,
 198                         box_y, box_x + check_x + 5, list_height);
 199 
 200     print_buttons(dialog, height, width, 0);
 201 
 202     while (key != ESC) {
 203         key = wgetch (dialog);
 204 
 205         for (i = 0; i < max_choice; i++)
 206             if (toupper(key) == toupper(items[(scroll+i)*3+1][0]))
 207                 break;
 208 
 209 
 210         if ( i < max_choice || key == KEY_UP || key == KEY_DOWN || 
 211             key == '+' || key == '-' ) {
 212             if (key == KEY_UP || key == '-') {
 213                 if (!choice) {
 214                     if (!scroll)
 215                         continue;
 216                     /* Scroll list down */
 217                     if (list_height > 1) {
 218                         /* De-highlight current first item */
 219                         print_item (list, items[scroll * 3 + 1],
 220                                         status[scroll], 0, FALSE);
 221                         scrollok (list, TRUE);
 222                         wscrl (list, -1);
 223                         scrollok (list, FALSE);
 224                     }
 225                     scroll--;
 226                     print_item (list, items[scroll * 3 + 1],
 227                                 status[scroll], 0, TRUE);
 228                     wnoutrefresh (list);
 229 
 230                     print_arrows(dialog, choice, item_no, scroll,
 231                                 box_y, box_x + check_x + 5, list_height);
 232 
 233                     wrefresh (dialog);
 234 
 235                     continue;   /* wait for another key press */
 236                 } else
 237                     i = choice - 1;
 238             } else if (key == KEY_DOWN || key == '+') {
 239                 if (choice == max_choice - 1) {
 240                     if (scroll + choice >= item_no - 1)
 241                         continue;
 242                     /* Scroll list up */
 243                     if (list_height > 1) {
 244                         /* De-highlight current last item before scrolling up */
 245                         print_item (list, items[(scroll + max_choice - 1) * 3 + 1],
 246                                     status[scroll + max_choice - 1],
 247                                     max_choice - 1, FALSE);
 248                         scrollok (list, TRUE);
 249                         scroll (list);
 250                         scrollok (list, FALSE);
 251                     }
 252                     scroll++;
 253                     print_item (list, items[(scroll + max_choice - 1) * 3 + 1],
 254                                 status[scroll + max_choice - 1],
 255                                 max_choice - 1, TRUE);
 256                     wnoutrefresh (list);
 257 
 258                     print_arrows(dialog, choice, item_no, scroll,
 259                                 box_y, box_x + check_x + 5, list_height);
 260 
 261                     wrefresh (dialog);
 262 
 263                     continue;   /* wait for another key press */
 264                 } else
 265                     i = choice + 1;
 266             }
 267             if (i != choice) {
 268                 /* De-highlight current item */
 269                 print_item (list, items[(scroll + choice) * 3 + 1],
 270                             status[scroll + choice], choice, FALSE);
 271                 /* Highlight new item */
 272                 choice = i;
 273                 print_item (list, items[(scroll + choice) * 3 + 1],
 274                             status[scroll + choice], choice, TRUE);
 275                 wnoutrefresh (list);
 276                 wrefresh (dialog);
 277             }
 278             continue;           /* wait for another key press */
 279         }
 280         switch (key) {
 281         case 'H':
 282         case 'h':
 283         case '?':
 284             delwin (dialog);
 285             free (status);
 286             return 1;
 287         case TAB:
 288         case KEY_LEFT:
 289         case KEY_RIGHT:
 290             button = ((key == KEY_LEFT ? --button : ++button) < 0)
 291                         ? 1 : (button > 1 ? 0 : button);
 292 
 293             print_buttons(dialog, height, width, button);
 294             wrefresh (dialog);
 295             break;
 296         case 'S':
 297         case 's':
 298         case ' ':
 299         case '\n':
 300             if (!button) {
 301                 if (flag == FLAG_CHECK) {
 302                     status[scroll + choice] = !status[scroll + choice];
 303                     wmove (list, choice, check_x);
 304                     wattrset (list, check_selected_attr);
 305                     wprintw (list, "[%c]", status[scroll + choice] ? 'X' : ' ');
 306                 } else {
 307                     if (!status[scroll + choice]) {
 308                         for (i = 0; i < item_no; i++)
 309                             status[i] = 0;
 310                         status[scroll + choice] = 1;
 311                         for (i = 0; i < max_choice; i++)
 312                             print_item (list, items[(scroll + i) * 3 + 1],
 313                                         status[scroll + i], i, i == choice);
 314                     }
 315                 }
 316                 wnoutrefresh (list);
 317                 wrefresh (dialog);
 318             
 319                 for (i = 0; i < item_no; i++) {
 320                     if (status[i]) {
 321                         if (flag == FLAG_CHECK) {
 322                             fprintf (stderr, "\"%s\" ", items[i * 3]);
 323                         } else {
 324                             fprintf (stderr, "%s", items[i * 3]);
 325                         }
 326 
 327                     }
 328                 }
 329             }
 330             delwin (dialog);
 331             free (status);
 332             return button;
 333         case 'X':
 334         case 'x':
 335             key = ESC;
 336         case ESC:
 337             break;
 338         }
 339     }
 340 
 341     delwin (dialog);
 342     free (status);
 343     return -1;                  /* ESC pressed */
 344 }
/* */
root/scripts/lxdialog/checklist.c

DEFINITIONS
