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 48 static int menu_width, item_x; 49 50 /* 51 * Print menu item 52 */ 53 static 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) \ 90 do { \ 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 */ 98 static 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 */ 142 static 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) */ 158 static 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 */ 171 int 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; 179 180 do_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