src/lxdialog/checklist.c

   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;
  27
  28 /*
  29  * Print list item
  30  */
  31 static void print_item(WINDOW * win, int choice, int selected)
  32 {
  33         int i;
  34         char *list_item = malloc(list_width + 1);
  35
  36         strncpy(list_item, item_str(), list_width - item_x);
  37         list_item[list_width - item_x] = '\0';
  38
  39         /* Clear 'residue' of last item */
  40         wattrset(win, dlg.menubox.atr);
  41         wmove(win, choice, 0);
  42         for (i = 0; i < list_width; i++)
  43                 waddch(win, ' ');
  44
  45         wmove(win, choice, check_x);
  46         wattrset(win, selected ? dlg.check_selected.atr
  47                  : dlg.check.atr);
  48         if (!item_is_tag(':'))
  49                 wprintw(win, "(%c)", item_is_tag('X') ? 'X' : ' ');
  50
  51         wattrset(win, selected ? dlg.tag_selected.atr : dlg.tag.atr);
  52         mvwaddch(win, choice, item_x, list_item[0]);
  53         wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
  54         waddstr(win, list_item + 1);
  55         if (selected) {
  56                 wmove(win, choice, check_x + 1);
  57                 wrefresh(win);
  58         }
  59         free(list_item);
  60 }
  61
  62 /*
  63  * Print the scroll indicators.
  64  */
  65 static void print_arrows(WINDOW * win, int choice, int item_no, int scroll,
  66              int y, int x, int height)
  67 {
  68         wmove(win, y, x);
  69
  70         if (scroll > 0) {
  71                 wattrset(win, dlg.uarrow.atr);
  72                 waddch(win, ACS_UARROW);
  73                 waddstr(win, "(-)");
  74         } else {
  75                 wattrset(win, dlg.menubox.atr);
  76                 waddch(win, ACS_HLINE);
  77                 waddch(win, ACS_HLINE);
  78                 waddch(win, ACS_HLINE);
  79                 waddch(win, ACS_HLINE);
  80         }
  81
  82         y = y + height + 1;
  83         wmove(win, y, x);
  84
  85         if ((height < item_no) && (scroll + choice < item_no - 1)) {
  86                 wattrset(win, dlg.darrow.atr);
  87                 waddch(win, ACS_DARROW);
  88                 waddstr(win, "(+)");
  89         } else {
  90                 wattrset(win, dlg.menubox_border.atr);
  91                 waddch(win, ACS_HLINE);
  92                 waddch(win, ACS_HLINE);
  93                 waddch(win, ACS_HLINE);
  94                 waddch(win, ACS_HLINE);
  95         }
  96 }
  97
  98 /*
  99  *  Display the termination buttons
 100  */
 101 static void print_buttons(WINDOW * dialog, int height, int width, int selected)
 102 {
 103         int x = width / 2 - 11;
 104         int y = height - 2;
 105
 106         print_button(dialog, gettext("Select"), y, x, selected == 0);
 107         print_button(dialog, gettext(" Help "), y, x + 14, selected == 1);
 108
 109         wmove(dialog, y, x + 1 + 14 * selected);
 110         wrefresh(dialog);
 111 }
 112
 113 /*
 114  * Display a dialog box with a list of options that can be turned on or off
 115  * in the style of radiolist (only one option turned on at a time).
 116  */
 117 int dialog_checklist(const char *title, const char *prompt, int height,
 118                      int width, int list_height)
 119 {
 120         int i, x, y, box_x, box_y;
 121         int key = 0, button = 0, choice = 0, scroll = 0, max_choice;
 122         WINDOW *dialog, *list;
 123
 124         /* which item to highlight */
 125         item_foreach() {
 126                 if (item_is_tag('X'))
 127                         choice = item_n();
 128                 if (item_is_selected()) {
 129                         choice = item_n();
 130                         break;
 131                 }
 132         }
 133
 134 do_resize:
 135         if (getmaxy(stdscr) < (height + CHECKLIST_HEIGTH_MIN))
 136                 return -ERRDISPLAYTOOSMALL;
 137         if (getmaxx(stdscr) < (width + CHECKLIST_WIDTH_MIN))
 138                 return -ERRDISPLAYTOOSMALL;
 139
 140         max_choice = MIN(list_height, item_count());
 141
 142         /* center dialog box on screen */
 143         x = (getmaxx(stdscr) - width) / 2;
 144         y = (getmaxy(stdscr) - height) / 2;
 145
 146         draw_shadow(stdscr, y, x, height, width);
 147
 148         dialog = newwin(height, width, y, x);
 149         keypad(dialog, TRUE);
 150
 151         draw_box(dialog, 0, 0, height, width,
 152                  dlg.dialog.atr, dlg.border.atr);
 153         wattrset(dialog, dlg.border.atr);
 154         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
 155         for (i = 0; i < width - 2; i++)
 156                 waddch(dialog, ACS_HLINE);
 157         wattrset(dialog, dlg.dialog.atr);
 158         waddch(dialog, ACS_RTEE);
 159
 160         print_title(dialog, title, width);
 161
 162         wattrset(dialog, dlg.dialog.atr);
 163         print_autowrap(dialog, prompt, width - 2, 1, 3);
 164
 165         list_width = width - 6;
 166         box_y = height - list_height - 5;
 167         box_x = (width - list_width) / 2 - 1;
 168
 169         /* create new window for the list */
 170         list = subwin(dialog, list_height, list_width, y + box_y + 1,
 171                       x + box_x + 1);
 172
 173         keypad(list, TRUE);
 174
 175         /* draw a box around the list items */
 176         draw_box(dialog, box_y, box_x, list_height + 2, list_width + 2,
 177                  dlg.menubox_border.atr, dlg.menubox.atr);
 178
 179         /* Find length of longest item in order to center checklist */
 180         check_x = 0;
 181         item_foreach()
 182                 check_x = MAX(check_x, strlen(item_str()) + 4);
 183         check_x = MIN(check_x, list_width);
 184
 185         check_x = (list_width - check_x) / 2;
 186         item_x = check_x + 4;
 187
 188         if (choice >= list_height) {
 189                 scroll = choice - list_height + 1;
 190                 choice -= scroll;
 191         }
 192
 193         /* Print the list */
 194         for (i = 0; i < max_choice; i++) {
 195                 item_set(scroll + i);
 196                 print_item(list, i, i == choice);
 197         }
 198
 199         print_arrows(dialog, choice, item_count(), scroll,
 200                      box_y, box_x + check_x + 5, list_height);
 201
 202         print_buttons(dialog, height, width, 0);
 203
 204         wnoutrefresh(dialog);
 205         wnoutrefresh(list);
 206         doupdate();
 207
 208         while (key != KEY_ESC) {
 209                 key = wgetch(dialog);
 210
 211                 for (i = 0; i < max_choice; i++) {
 212                         item_set(i + scroll);
 213                         if (toupper(key) == toupper(item_str()[0]))
 214                                 break;
 215                 }
 216
 217                 if (i < max_choice || key == KEY_UP || key == KEY_DOWN ||
 218                     key == '+' || key == '-') {
 219                         if (key == KEY_UP || key == '-') {
 220                                 if (!choice) {
 221                                         if (!scroll)
 222                                                 continue;
 223                                         /* Scroll list down */
 224                                         if (list_height > 1) {
 225                                                 /* De-highlight current first item */
 226                                                 item_set(scroll);
 227                                                 print_item(list, 0, FALSE);
 228                                                 scrollok(list, TRUE);
 229                                                 wscrl(list, -1);
 230                                                 scrollok(list, FALSE);
 231                                         }
 232                                         scroll--;
 233                                         item_set(scroll);
 234                                         print_item(list, 0, TRUE);
 235                                         print_arrows(dialog, choice, item_count(),
 236                                                      scroll, box_y, box_x + check_x + 5, list_height);
 237
 238                                         wnoutrefresh(dialog);
 239                                         wrefresh(list);
 240
 241                                         continue;       /* wait for another key press */
 242                                 } else
 243                                         i = choice - 1;
 244                         } else if (key == KEY_DOWN || key == '+') {
 245                                 if (choice == max_choice - 1) {
 246                                         if (scroll + choice >= item_count() - 1)
 247                                                 continue;
 248                                         /* Scroll list up */
 249                                         if (list_height > 1) {
 250                                                 /* De-highlight current last item before scrolling up */
 251                                                 item_set(scroll + max_choice - 1);
 252                                                 print_item(list,
 253                                                             max_choice - 1,
 254                                                             FALSE);
 255                                                 scrollok(list, TRUE);
 256                                                 wscrl(list, 1);
 257                                                 scrollok(list, FALSE);
 258                                         }
 259                                         scroll++;
 260                                         item_set(scroll + max_choice - 1);
 261                                         print_item(list, max_choice - 1, TRUE);
 262
 263                                         print_arrows(dialog, choice, item_count(),
 264                                                      scroll, box_y, box_x + check_x + 5, list_height);
 265
 266                                         wnoutrefresh(dialog);
 267                                         wrefresh(list);
 268
 269                                         continue;       /* wait for another key press */
 270                                 } else
 271                                         i = choice + 1;
 272                         }
 273                         if (i != choice) {
 274                                 /* De-highlight current item */
 275                                 item_set(scroll + choice);
 276                                 print_item(list, choice, FALSE);
 277                                 /* Highlight new item */
 278                                 choice = i;
 279                                 item_set(scroll + choice);
 280                                 print_item(list, choice, TRUE);
 281                                 wnoutrefresh(dialog);
 282                                 wrefresh(list);
 283                         }
 284                         continue;       /* wait for another key press */
 285                 }
 286                 switch (key) {
 287                 case 'H':
 288                 case 'h':
 289                 case '?':
 290                         button = 1;
 291                         /* fall-through */
 292                 case 'S':
 293                 case 's':
 294                 case ' ':
 295                 case '\n':
 296                         item_foreach()
 297                                 item_set_selected(0);
 298                         item_set(scroll + choice);
 299                         item_set_selected(1);
 300                         delwin(list);
 301                         delwin(dialog);
 302                         return button;
 303                 case TAB:
 304                 case KEY_LEFT:
 305                 case KEY_RIGHT:
 306                         button = ((key == KEY_LEFT ? --button : ++button) < 0)
 307                             ? 1 : (button > 1 ? 0 : button);
 308
 309                         print_buttons(dialog, height, width, button);
 310                         wrefresh(dialog);
 311                         break;
 312                 case 'X':
 313                 case 'x':
 314                         key = KEY_ESC;
 315                         break;
 316                 case KEY_ESC:
 317                         key = on_key_esc(dialog);
 318                         break;
 319                 case KEY_RESIZE:
 320                         delwin(list);
 321                         delwin(dialog);
 322                         on_key_resize();
 323                         goto do_resize;
 324                 }
 325
 326                 /* Now, update everything... */
 327                 doupdate();
 328         }
 329         delwin(list);
 330         delwin(dialog);
 331         return key;             /* ESC pressed */
 332 }