akaros/scripts/kconfig/lxdialog/menubox.c
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   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
  61static int menu_width, item_x;
  62
  63/*
  64 * Print menu item
  65 */
  66static void do_print_item(WINDOW * win, const char *item, int line_y,
  67                          int selected, int hotkey)
  68{
  69        int j;
  70        char *menu_item = malloc(menu_width + 1);
  71
  72        strncpy(menu_item, item, menu_width - item_x);
  73        menu_item[menu_width - item_x] = '\0';
  74        j = first_alpha(menu_item, "YyNnMmHh");
  75
  76        /* Clear 'residue' of last item */
  77        wattrset(win, dlg.menubox.atr);
  78        wmove(win, line_y, 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 ? dlg.item_selected.atr : dlg.item.atr);
  89        mvwaddstr(win, line_y, item_x, menu_item);
  90        if (hotkey) {
  91                wattrset(win, selected ? dlg.tag_key_selected.atr
  92                         : dlg.tag_key.atr);
  93                mvwaddch(win, line_y, item_x + j, menu_item[j]);
  94        }
  95        if (selected) {
  96                wmove(win, line_y, item_x + 1);
  97        }
  98        free(menu_item);
  99        wrefresh(win);
 100}
 101
 102#define print_item(index, choice, selected)                             \
 103do {                                                                    \
 104        item_set(index);                                                \
 105        do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \
 106} while (0)
 107
 108/*
 109 * Print the scroll indicators.
 110 */
 111static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
 112                         int height)
 113{
 114        int cur_y, cur_x;
 115
 116        getyx(win, cur_y, cur_x);
 117
 118        wmove(win, y, x);
 119
 120        if (scroll > 0) {
 121                wattrset(win, dlg.uarrow.atr);
 122                waddch(win, ACS_UARROW);
 123                waddstr(win, "(-)");
 124        } else {
 125                wattrset(win, dlg.menubox.atr);
 126                waddch(win, ACS_HLINE);
 127                waddch(win, ACS_HLINE);
 128                waddch(win, ACS_HLINE);
 129                waddch(win, ACS_HLINE);
 130        }
 131
 132        y = y + height + 1;
 133        wmove(win, y, x);
 134        wrefresh(win);
 135
 136        if ((height < item_no) && (scroll + height < item_no)) {
 137                wattrset(win, dlg.darrow.atr);
 138                waddch(win, ACS_DARROW);
 139                waddstr(win, "(+)");
 140        } else {
 141                wattrset(win, dlg.menubox_border.atr);
 142                waddch(win, ACS_HLINE);
 143                waddch(win, ACS_HLINE);
 144                waddch(win, ACS_HLINE);
 145                waddch(win, ACS_HLINE);
 146        }
 147
 148        wmove(win, cur_y, cur_x);
 149        wrefresh(win);
 150}
 151
 152/*
 153 * Display the termination buttons.
 154 */
 155static void print_buttons(WINDOW * win, int height, int width, int selected)
 156{
 157        int x = width / 2 - 16;
 158        int y = height - 2;
 159
 160        print_button(win, gettext("Select"), y, x, selected == 0);
 161        print_button(win, gettext(" Exit "), y, x + 12, selected == 1);
 162        print_button(win, gettext(" Help "), y, x + 24, selected == 2);
 163
 164        wmove(win, y, x + 1 + 12 * selected);
 165        wrefresh(win);
 166}
 167
 168/* scroll up n lines (n may be negative) */
 169static void do_scroll(WINDOW *win, int *scroll, int n)
 170{
 171        /* Scroll menu up */
 172        scrollok(win, TRUE);
 173        wscrl(win, n);
 174        scrollok(win, FALSE);
 175        *scroll = *scroll + n;
 176        wrefresh(win);
 177}
 178
 179/*
 180 * Display a menu for choosing among a number of options
 181 */
 182int dialog_menu(const char *title, const char *prompt,
 183                const void *selected, int *s_scroll)
 184{
 185        int i, j, x, y, box_x, box_y;
 186        int height, width, menu_height;
 187        int key = 0, button = 0, scroll = 0, choice = 0;
 188        int first_item =  0, max_choice;
 189        WINDOW *dialog, *menu;
 190
 191do_resize:
 192        height = getmaxy(stdscr);
 193        width = getmaxx(stdscr);
 194        if (height < 15 || width < 65)
 195                return -ERRDISPLAYTOOSMALL;
 196
 197        height -= 4;
 198        width  -= 5;
 199        menu_height = height - 10;
 200
 201        max_choice = MIN(menu_height, item_count());
 202
 203        /* center dialog box on screen */
 204        x = (COLS - width) / 2;
 205        y = (LINES - height) / 2;
 206
 207        draw_shadow(stdscr, y, x, height, width);
 208
 209        dialog = newwin(height, width, y, x);
 210        keypad(dialog, TRUE);
 211
 212        draw_box(dialog, 0, 0, height, width,
 213                 dlg.dialog.atr, dlg.border.atr);
 214        wattrset(dialog, dlg.border.atr);
 215        mvwaddch(dialog, height - 3, 0, ACS_LTEE);
 216        for (i = 0; i < width - 2; i++)
 217                waddch(dialog, ACS_HLINE);
 218        wattrset(dialog, dlg.dialog.atr);
 219        wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
 220        waddch(dialog, ACS_RTEE);
 221
 222        print_title(dialog, title, width);
 223
 224        wattrset(dialog, dlg.dialog.atr);
 225        print_autowrap(dialog, prompt, width - 2, 1, 3);
 226
 227        menu_width = width - 6;
 228        box_y = height - menu_height - 5;
 229        box_x = (width - menu_width) / 2 - 1;
 230
 231        /* create new window for the menu */
 232        menu = subwin(dialog, menu_height, menu_width,
 233                      y + box_y + 1, x + box_x + 1);
 234        keypad(menu, TRUE);
 235
 236        /* draw a box around the menu items */
 237        draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
 238                 dlg.menubox_border.atr, dlg.menubox.atr);
 239
 240        if (menu_width >= 80)
 241                item_x = (menu_width - 70) / 2;
 242        else
 243                item_x = 4;
 244
 245        /* Set choice to default item */
 246        item_foreach()
 247                if (selected && (selected == item_data()))
 248                        choice = item_n();
 249        /* get the saved scroll info */
 250        scroll = *s_scroll;
 251        if ((scroll <= choice) && (scroll + max_choice > choice) &&
 252           (scroll >= 0) && (scroll + max_choice <= item_count())) {
 253                first_item = scroll;
 254                choice = choice - scroll;
 255        } else {
 256                scroll = 0;
 257        }
 258        if ((choice >= max_choice)) {
 259                if (choice >= item_count() - max_choice / 2)
 260                        scroll = first_item = item_count() - max_choice;
 261                else
 262                        scroll = first_item = choice - max_choice / 2;
 263                choice = choice - scroll;
 264        }
 265
 266        /* Print the menu */
 267        for (i = 0; i < max_choice; i++) {
 268                print_item(first_item + i, i, i == choice);
 269        }
 270
 271        wnoutrefresh(menu);
 272
 273        print_arrows(dialog, item_count(), scroll,
 274                     box_y, box_x + item_x + 1, menu_height);
 275
 276        print_buttons(dialog, height, width, 0);
 277        wmove(menu, choice, item_x + 1);
 278        wrefresh(menu);
 279
 280        while (key != KEY_ESC) {
 281                key = wgetch(menu);
 282
 283                if (key < 256 && isalpha(key))
 284                        key = tolower(key);
 285
 286                if (strchr("ynmh", key))
 287                        i = max_choice;
 288                else {
 289                        for (i = choice + 1; i < max_choice; i++) {
 290                                item_set(scroll + i);
 291                                j = first_alpha(item_str(), "YyNnMmHh");
 292                                if (key == tolower(item_str()[j]))
 293                                        break;
 294                        }
 295                        if (i == max_choice)
 296                                for (i = 0; i < max_choice; i++) {
 297                                        item_set(scroll + i);
 298                                        j = first_alpha(item_str(), "YyNnMmHh");
 299                                        if (key == tolower(item_str()[j]))
 300                                                break;
 301                                }
 302                }
 303
 304                if (i < max_choice ||
 305                    key == KEY_UP || key == KEY_DOWN ||
 306                    key == '-' || key == '+' ||
 307                    key == KEY_PPAGE || key == KEY_NPAGE) {
 308                        /* Remove highligt of current item */
 309                        print_item(scroll + choice, choice, FALSE);
 310
 311                        if (key == KEY_UP || key == '-') {
 312                                if (choice < 2 && scroll) {
 313                                        /* Scroll menu down */
 314                                        do_scroll(menu, &scroll, -1);
 315
 316                                        print_item(scroll, 0, FALSE);
 317                                } else
 318                                        choice = MAX(choice - 1, 0);
 319
 320                        } else if (key == KEY_DOWN || key == '+') {
 321                                print_item(scroll+choice, choice, FALSE);
 322
 323                                if ((choice > max_choice - 3) &&
 324                                    (scroll + max_choice < item_count())) {
 325                                        /* Scroll menu up */
 326                                        do_scroll(menu, &scroll, 1);
 327
 328                                        print_item(scroll+max_choice - 1,
 329                                                   max_choice - 1, FALSE);
 330                                } else
 331                                        choice = MIN(choice + 1, max_choice - 1);
 332
 333                        } else if (key == KEY_PPAGE) {
 334                                scrollok(menu, TRUE);
 335                                for (i = 0; (i < max_choice); i++) {
 336                                        if (scroll > 0) {
 337                                                do_scroll(menu, &scroll, -1);
 338                                                print_item(scroll, 0, FALSE);
 339                                        } else {
 340                                                if (choice > 0)
 341                                                        choice--;
 342                                        }
 343                                }
 344
 345                        } else if (key == KEY_NPAGE) {
 346                                for (i = 0; (i < max_choice); i++) {
 347                                        if (scroll + max_choice < item_count()) {
 348                                                do_scroll(menu, &scroll, 1);
 349                                                print_item(scroll+max_choice-1,
 350                                                           max_choice - 1, FALSE);
 351                                        } else {
 352                                                if (choice + 1 < max_choice)
 353                                                        choice++;
 354                                        }
 355                                }
 356                        } else
 357                                choice = i;
 358
 359                        print_item(scroll + choice, choice, TRUE);
 360
 361                        print_arrows(dialog, item_count(), scroll,
 362                                     box_y, box_x + item_x + 1, menu_height);
 363
 364                        wnoutrefresh(dialog);
 365                        wrefresh(menu);
 366
 367                        continue;       /* wait for another key press */
 368                }
 369
 370                switch (key) {
 371                case KEY_LEFT:
 372                case TAB:
 373                case KEY_RIGHT:
 374                        button = ((key == KEY_LEFT ? --button : ++button) < 0)
 375                            ? 2 : (button > 2 ? 0 : button);
 376
 377                        print_buttons(dialog, height, width, button);
 378                        wrefresh(menu);
 379                        break;
 380                case ' ':
 381                case 's':
 382                case 'y':
 383                case 'n':
 384                case 'm':
 385                case '/':
 386                case 'h':
 387                case '?':
 388                case 'z':
 389                case '\n':
 390                        /* save scroll info */
 391                        *s_scroll = scroll;
 392                        delwin(menu);
 393                        delwin(dialog);
 394                        item_set(scroll + choice);
 395                        item_set_selected(1);
 396                        switch (key) {
 397                        case 'h':
 398                        case '?':
 399                                return 2;
 400                        case 's':
 401                        case 'y':
 402                                return 3;
 403                        case 'n':
 404                                return 4;
 405                        case 'm':
 406                                return 5;
 407                        case ' ':
 408                                return 6;
 409                        case '/':
 410                                return 7;
 411                        case 'z':
 412                                return 8;
 413                        case '\n':
 414                                return button;
 415                        }
 416                        return 0;
 417                case 'e':
 418                case 'x':
 419                        key = KEY_ESC;
 420                        break;
 421                case KEY_ESC:
 422                        key = on_key_esc(menu);
 423                        break;
 424                case KEY_RESIZE:
 425                        on_key_resize();
 426                        delwin(menu);
 427                        delwin(dialog);
 428                        goto do_resize;
 429                }
 430        }
 431        delwin(menu);
 432        delwin(dialog);
 433        return key;             /* ESC pressed */
 434}
 435