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