uboot/scripts/kconfig/lxdialog/menubox.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 *  menubox.c -- implements the menu box
   4 *
   5 *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
   6 *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
   7 */
   8
   9/*
  10 *  Changes by Clifford Wolf (god@clifford.at)
  11 *
  12 *  [ 1998-06-13 ]
  13 *
  14 *    *)  A bugfix for the Page-Down problem
  15 *
  16 *    *)  Formerly when I used Page Down and Page Up, the cursor would be set
  17 *        to the first position in the menu box.  Now lxdialog is a bit
  18 *        smarter and works more like other menu systems (just have a look at
  19 *        it).
  20 *
  21 *    *)  Formerly if I selected something my scrolling would be broken because
  22 *        lxdialog is re-invoked by the Menuconfig shell script, can't
  23 *        remember the last scrolling position, and just sets it so that the
  24 *        cursor is at the bottom of the box.  Now it writes the temporary file
  25 *        lxdialog.scrltmp which contains this information. The file is
  26 *        deleted by lxdialog if the user leaves a submenu or enters a new
  27 *        one, but it would be nice if Menuconfig could make another "rm -f"
  28 *        just to be sure.  Just try it out - you will recognise a difference!
  29 *
  30 *  [ 1998-06-14 ]
  31 *
  32 *    *)  Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
  33 *        and menus change their size on the fly.
  34 *
  35 *    *)  If for some reason the last scrolling position is not saved by
  36 *        lxdialog, it sets the scrolling so that the selected item is in the
  37 *        middle of the menu box, not at the bottom.
  38 *
  39 * 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)
  40 * Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus.
  41 * This fixes a bug in Menuconfig where using ' ' to descend into menus
  42 * would leave mis-synchronized lxdialog.scrltmp files lying around,
  43 * fscanf would read in 'scroll', and eventually that value would get used.
  44 */
  45
  46#include "dialog.h"
  47
  48static int menu_width, item_x;
  49
  50/*
  51 * Print menu item
  52 */
  53static void do_print_item(WINDOW * win, const char *item, int line_y,
  54                          int selected, int hotkey)
  55{
  56        int j;
  57        char *menu_item = malloc(menu_width + 1);
  58
  59        strncpy(menu_item, item, menu_width - item_x);
  60        menu_item[menu_width - item_x] = '\0';
  61        j = first_alpha(menu_item, "YyNnMmHh");
  62
  63        /* Clear 'residue' of last item */
  64        wattrset(win, dlg.menubox.atr);
  65        wmove(win, line_y, 0);
  66#if OLD_NCURSES
  67        {
  68                int i;
  69                for (i = 0; i < menu_width; i++)
  70                        waddch(win, ' ');
  71        }
  72#else
  73        wclrtoeol(win);
  74#endif
  75        wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
  76        mvwaddstr(win, line_y, item_x, menu_item);
  77        if (hotkey) {
  78                wattrset(win, selected ? dlg.tag_key_selected.atr
  79                         : dlg.tag_key.atr);
  80                mvwaddch(win, line_y, item_x + j, menu_item[j]);
  81        }
  82        if (selected) {
  83                wmove(win, line_y, item_x + 1);
  84        }
  85        free(menu_item);
  86        wrefresh(win);
  87}
  88
  89#define print_item(index, choice, selected)                             \
  90do {                                                                    \
  91        item_set(index);                                                \
  92        do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \
  93} while (0)
  94
  95/*
  96 * Print the scroll indicators.
  97 */
  98static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
  99                         int height)
 100{
 101        int cur_y, cur_x;
 102
 103        getyx(win, cur_y, cur_x);
 104
 105        wmove(win, y, x);
 106
 107        if (scroll > 0) {
 108                wattrset(win, dlg.uarrow.atr);
 109                waddch(win, ACS_UARROW);
 110                waddstr(win, "(-)");
 111        } else {
 112                wattrset(win, dlg.menubox.atr);
 113                waddch(win, ACS_HLINE);
 114                waddch(win, ACS_HLINE);
 115                waddch(win, ACS_HLINE);
 116                waddch(win, ACS_HLINE);
 117        }
 118
 119        y = y + height + 1;
 120        wmove(win, y, x);
 121        wrefresh(win);
 122
 123        if ((height < item_no) && (scroll + height < item_no)) {
 124                wattrset(win, dlg.darrow.atr);
 125                waddch(win, ACS_DARROW);
 126                waddstr(win, "(+)");
 127        } else {
 128                wattrset(win, dlg.menubox_border.atr);
 129                waddch(win, ACS_HLINE);
 130                waddch(win, ACS_HLINE);
 131                waddch(win, ACS_HLINE);
 132                waddch(win, ACS_HLINE);
 133        }
 134
 135        wmove(win, cur_y, cur_x);
 136        wrefresh(win);
 137}
 138
 139/*
 140 * Display the termination buttons.
 141 */
 142static void print_buttons(WINDOW * win, int height, int width, int selected)
 143{
 144        int x = width / 2 - 28;
 145        int y = height - 2;
 146
 147        print_button(win, "Select", y, x, selected == 0);
 148        print_button(win, " Exit ", y, x + 12, selected == 1);
 149        print_button(win, " Help ", y, x + 24, selected == 2);
 150        print_button(win, " Save ", y, x + 36, selected == 3);
 151        print_button(win, " Load ", y, x + 48, selected == 4);
 152
 153        wmove(win, y, x + 1 + 12 * selected);
 154        wrefresh(win);
 155}
 156
 157/* scroll up n lines (n may be negative) */
 158static void do_scroll(WINDOW *win, int *scroll, int n)
 159{
 160        /* Scroll menu up */
 161        scrollok(win, TRUE);
 162        wscrl(win, n);
 163        scrollok(win, FALSE);
 164        *scroll = *scroll + n;
 165        wrefresh(win);
 166}
 167
 168/*
 169 * Display a menu for choosing among a number of options
 170 */
 171int dialog_menu(const char *title, const char *prompt,
 172                const void *selected, int *s_scroll)
 173{
 174        int i, j, x, y, box_x, box_y;
 175        int height, width, menu_height;
 176        int key = 0, button = 0, scroll = 0, choice = 0;
 177        int first_item =  0, max_choice;
 178        WINDOW *dialog, *menu;
 179
 180do_resize:
 181        height = getmaxy(stdscr);
 182        width = getmaxx(stdscr);
 183        if (height < MENUBOX_HEIGTH_MIN || width < MENUBOX_WIDTH_MIN)
 184                return -ERRDISPLAYTOOSMALL;
 185
 186        height -= 4;
 187        width  -= 5;
 188        menu_height = height - 10;
 189
 190        max_choice = MIN(menu_height, item_count());
 191
 192        /* center dialog box on screen */
 193        x = (getmaxx(stdscr) - width) / 2;
 194        y = (getmaxy(stdscr) - height) / 2;
 195
 196        draw_shadow(stdscr, y, x, height, width);
 197
 198        dialog = newwin(height, width, y, x);
 199        keypad(dialog, TRUE);
 200
 201        draw_box(dialog, 0, 0, height, width,
 202                 dlg.dialog.atr, dlg.border.atr);
 203        wattrset(dialog, dlg.border.atr);
 204        mvwaddch(dialog, height - 3, 0, ACS_LTEE);
 205        for (i = 0; i < width - 2; i++)
 206                waddch(dialog, ACS_HLINE);
 207        wattrset(dialog, dlg.dialog.atr);
 208        wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
 209        waddch(dialog, ACS_RTEE);
 210
 211        print_title(dialog, title, width);
 212
 213        wattrset(dialog, dlg.dialog.atr);
 214        print_autowrap(dialog, prompt, width - 2, 1, 3);
 215
 216        menu_width = width - 6;
 217        box_y = height - menu_height - 5;
 218        box_x = (width - menu_width) / 2 - 1;
 219
 220        /* create new window for the menu */
 221        menu = subwin(dialog, menu_height, menu_width,
 222                      y + box_y + 1, x + box_x + 1);
 223        keypad(menu, TRUE);
 224
 225        /* draw a box around the menu items */
 226        draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
 227                 dlg.menubox_border.atr, dlg.menubox.atr);
 228
 229        if (menu_width >= 80)
 230                item_x = (menu_width - 70) / 2;
 231        else
 232                item_x = 4;
 233
 234        /* Set choice to default item */
 235        item_foreach()
 236                if (selected && (selected == item_data()))
 237                        choice = item_n();
 238        /* get the saved scroll info */
 239        scroll = *s_scroll;
 240        if ((scroll <= choice) && (scroll + max_choice > choice) &&
 241           (scroll >= 0) && (scroll + max_choice <= item_count())) {
 242                first_item = scroll;
 243                choice = choice - scroll;
 244        } else {
 245                scroll = 0;
 246        }
 247        if ((choice >= max_choice)) {
 248                if (choice >= item_count() - max_choice / 2)
 249                        scroll = first_item = item_count() - max_choice;
 250                else
 251                        scroll = first_item = choice - max_choice / 2;
 252                choice = choice - scroll;
 253        }
 254
 255        /* Print the menu */
 256        for (i = 0; i < max_choice; i++) {
 257                print_item(first_item + i, i, i == choice);
 258        }
 259
 260        wnoutrefresh(menu);
 261
 262        print_arrows(dialog, item_count(), scroll,
 263                     box_y, box_x + item_x + 1, menu_height);
 264
 265        print_buttons(dialog, height, width, 0);
 266        wmove(menu, choice, item_x + 1);
 267        wrefresh(menu);
 268
 269        while (key != KEY_ESC) {
 270                key = wgetch(menu);
 271
 272                if (key < 256 && isalpha(key))
 273                        key = tolower(key);
 274
 275                if (strchr("ynmh", key))
 276                        i = max_choice;
 277                else {
 278                        for (i = choice + 1; i < max_choice; i++) {
 279                                item_set(scroll + i);
 280                                j = first_alpha(item_str(), "YyNnMmHh");
 281                                if (key == tolower(item_str()[j]))
 282                                        break;
 283                        }
 284                        if (i == max_choice)
 285                                for (i = 0; i < max_choice; i++) {
 286                                        item_set(scroll + i);
 287                                        j = first_alpha(item_str(), "YyNnMmHh");
 288                                        if (key == tolower(item_str()[j]))
 289                                                break;
 290                                }
 291                }
 292
 293                if (item_count() != 0 &&
 294                    (i < max_choice ||
 295                     key == KEY_UP || key == KEY_DOWN ||
 296                     key == '-' || key == '+' ||
 297                     key == KEY_PPAGE || key == KEY_NPAGE)) {
 298                        /* Remove highligt of current item */
 299                        print_item(scroll + choice, choice, FALSE);
 300
 301                        if (key == KEY_UP || key == '-') {
 302                                if (choice < 2 && scroll) {
 303                                        /* Scroll menu down */
 304                                        do_scroll(menu, &scroll, -1);
 305
 306                                        print_item(scroll, 0, FALSE);
 307                                } else
 308                                        choice = MAX(choice - 1, 0);
 309
 310                        } else if (key == KEY_DOWN || key == '+') {
 311                                print_item(scroll+choice, choice, FALSE);
 312
 313                                if ((choice > max_choice - 3) &&
 314                                    (scroll + max_choice < item_count())) {
 315                                        /* Scroll menu up */
 316                                        do_scroll(menu, &scroll, 1);
 317
 318                                        print_item(scroll+max_choice - 1,
 319                                                   max_choice - 1, FALSE);
 320                                } else
 321                                        choice = MIN(choice + 1, max_choice - 1);
 322
 323                        } else if (key == KEY_PPAGE) {
 324                                scrollok(menu, TRUE);
 325                                for (i = 0; (i < max_choice); i++) {
 326                                        if (scroll > 0) {
 327                                                do_scroll(menu, &scroll, -1);
 328                                                print_item(scroll, 0, FALSE);
 329                                        } else {
 330                                                if (choice > 0)
 331                                                        choice--;
 332                                        }
 333                                }
 334
 335                        } else if (key == KEY_NPAGE) {
 336                                for (i = 0; (i < max_choice); i++) {
 337                                        if (scroll + max_choice < item_count()) {
 338                                                do_scroll(menu, &scroll, 1);
 339                                                print_item(scroll+max_choice-1,
 340                                                           max_choice - 1, FALSE);
 341                                        } else {
 342                                                if (choice + 1 < max_choice)
 343                                                        choice++;
 344                                        }
 345                                }
 346                        } else
 347                                choice = i;
 348
 349                        print_item(scroll + choice, choice, TRUE);
 350
 351                        print_arrows(dialog, item_count(), scroll,
 352                                     box_y, box_x + item_x + 1, menu_height);
 353
 354                        wnoutrefresh(dialog);
 355                        wrefresh(menu);
 356
 357                        continue;       /* wait for another key press */
 358                }
 359
 360                switch (key) {
 361                case KEY_LEFT:
 362                case TAB:
 363                case KEY_RIGHT:
 364                        button = ((key == KEY_LEFT ? --button : ++button) < 0)
 365                            ? 4 : (button > 4 ? 0 : button);
 366
 367                        print_buttons(dialog, height, width, button);
 368                        wrefresh(menu);
 369                        break;
 370                case ' ':
 371                case 's':
 372                case 'y':
 373                case 'n':
 374                case 'm':
 375                case '/':
 376                case 'h':
 377                case '?':
 378                case 'z':
 379                case '\n':
 380                        /* save scroll info */
 381                        *s_scroll = scroll;
 382                        delwin(menu);
 383                        delwin(dialog);
 384                        item_set(scroll + choice);
 385                        item_set_selected(1);
 386                        switch (key) {
 387                        case 'h':
 388                        case '?':
 389                                return 2;
 390                        case 's':
 391                        case 'y':
 392                                return 5;
 393                        case 'n':
 394                                return 6;
 395                        case 'm':
 396                                return 7;
 397                        case ' ':
 398                                return 8;
 399                        case '/':
 400                                return 9;
 401                        case 'z':
 402                                return 10;
 403                        case '\n':
 404                                return button;
 405                        }
 406                        return 0;
 407                case 'e':
 408                case 'x':
 409                        key = KEY_ESC;
 410                        break;
 411                case KEY_ESC:
 412                        key = on_key_esc(menu);
 413                        break;
 414                case KEY_RESIZE:
 415                        on_key_resize();
 416                        delwin(menu);
 417                        delwin(dialog);
 418                        goto do_resize;
 419                }
 420        }
 421        delwin(menu);
 422        delwin(dialog);
 423        return key;             /* ESC pressed */
 424}
 425