akaros/scripts/kconfig/lxdialog/checklist.c
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   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
  26static int list_width, check_x, item_x;
  27
  28/*
  29 * Print list item
  30 */
  31static 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 */
  65static 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 */
 101static 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 */
 117int 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
 134do_resize:
 135        if (getmaxy(stdscr) < (height + 6))
 136                return -ERRDISPLAYTOOSMALL;
 137        if (getmaxx(stdscr) < (width + 6))
 138                return -ERRDISPLAYTOOSMALL;
 139
 140        max_choice = MIN(list_height, item_count());
 141
 142        /* center dialog box on screen */
 143        x = (COLS - width) / 2;
 144        y = (LINES - 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}
 333