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 wclrtoeol(win); 67 wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr); 68 mvwaddstr(win, line_y, item_x, menu_item); 69 if (hotkey) { 70 wattrset(win, selected ? dlg.tag_key_selected.atr 71 : dlg.tag_key.atr); 72 mvwaddch(win, line_y, item_x + j, menu_item[j]); 73 } 74 if (selected) { 75 wmove(win, line_y, item_x + 1); 76 } 77 free(menu_item); 78 wrefresh(win); 79 } 80 81 #define print_item(index, choice, selected) \ 82 do { \ 83 item_set(index); \ 84 do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \ 85 } while (0) 86 87 /* 88 * Print the scroll indicators. 89 */ 90 static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x, 91 int height) 92 { 93 int cur_y, cur_x; 94 95 getyx(win, cur_y, cur_x); 96 97 wmove(win, y, x); 98 99 if (scroll > 0) { 100 wattrset(win, dlg.uarrow.atr); 101 waddch(win, ACS_UARROW); 102 waddstr(win, "(-)"); 103 } else { 104 wattrset(win, dlg.menubox.atr); 105 waddch(win, ACS_HLINE); 106 waddch(win, ACS_HLINE); 107 waddch(win, ACS_HLINE); 108 waddch(win, ACS_HLINE); 109 } 110 111 y = y + height + 1; 112 wmove(win, y, x); 113 wrefresh(win); 114 115 if ((height < item_no) && (scroll + height < item_no)) { 116 wattrset(win, dlg.darrow.atr); 117 waddch(win, ACS_DARROW); 118 waddstr(win, "(+)"); 119 } else { 120 wattrset(win, dlg.menubox_border.atr); 121 waddch(win, ACS_HLINE); 122 waddch(win, ACS_HLINE); 123 waddch(win, ACS_HLINE); 124 waddch(win, ACS_HLINE); 125 } 126 127 wmove(win, cur_y, cur_x); 128 wrefresh(win); 129 } 130 131 /* 132 * Display the termination buttons. 133 */ 134 static void print_buttons(WINDOW * win, int height, int width, int selected) 135 { 136 int x = width / 2 - 28; 137 int y = height - 2; 138 139 print_button(win, "Select", y, x, selected == 0); 140 print_button(win, " Exit ", y, x + 12, selected == 1); 141 print_button(win, " Help ", y, x + 24, selected == 2); 142 print_button(win, " Save ", y, x + 36, selected == 3); 143 print_button(win, " Load ", y, x + 48, selected == 4); 144 145 wmove(win, y, x + 1 + 12 * selected); 146 wrefresh(win); 147 } 148 149 /* scroll up n lines (n may be negative) */ 150 static void do_scroll(WINDOW *win, int *scroll, int n) 151 { 152 /* Scroll menu up */ 153 scrollok(win, TRUE); 154 wscrl(win, n); 155 scrollok(win, FALSE); 156 *scroll = *scroll + n; 157 wrefresh(win); 158 } 159 160 /* 161 * Display a menu for choosing among a number of options 162 */ 163 int dialog_menu(const char *title, const char *prompt, 164 const void *selected, int *s_scroll) 165 { 166 int i, j, x, y, box_x, box_y; 167 int height, width, menu_height; 168 int key = 0, button = 0, scroll = 0, choice = 0; 169 int first_item = 0, max_choice; 170 WINDOW *dialog, *menu; 171 172 do_resize: 173 height = getmaxy(stdscr); 174 width = getmaxx(stdscr); 175 if (height < MENUBOX_HEIGHT_MIN || width < MENUBOX_WIDTH_MIN) 176 return -ERRDISPLAYTOOSMALL; 177 178 height -= 4; 179 width -= 5; 180 menu_height = height - 10; 181 182 max_choice = MIN(menu_height, item_count()); 183 184 /* center dialog box on screen */ 185 x = (getmaxx(stdscr) - width) / 2; 186 y = (getmaxy(stdscr) - height) / 2; 187 188 draw_shadow(stdscr, y, x, height, width); 189 190 dialog = newwin(height, width, y, x); 191 keypad(dialog, TRUE); 192 193 draw_box(dialog, 0, 0, height, width, 194 dlg.dialog.atr, dlg.border.atr); 195 wattrset(dialog, dlg.border.atr); 196 mvwaddch(dialog, height - 3, 0, ACS_LTEE); 197 for (i = 0; i < width - 2; i++) 198 waddch(dialog, ACS_HLINE); 199 wattrset(dialog, dlg.dialog.atr); 200 wbkgdset(dialog, dlg.dialog.atr & A_COLOR); 201 waddch(dialog, ACS_RTEE); 202 203 print_title(dialog, title, width); 204 205 wattrset(dialog, dlg.dialog.atr); 206 print_autowrap(dialog, prompt, width - 2, 1, 3); 207 208 menu_width = width - 6; 209 box_y = height - menu_height - 5; 210 box_x = (width - menu_width) / 2 - 1; 211 212 /* create new window for the menu */ 213 menu = subwin(dialog, menu_height, menu_width, 214 y + box_y + 1, x + box_x + 1); 215 keypad(menu, TRUE); 216 217 /* draw a box around the menu items */ 218 draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2, 219 dlg.menubox_border.atr, dlg.menubox.atr); 220 221 if (menu_width >= 80) 222 item_x = (menu_width - 70) / 2; 223 else 224 item_x = 4; 225 226 /* Set choice to default item */ 227 item_foreach() 228 if (selected && (selected == item_data())) 229 choice = item_n(); 230 /* get the saved scroll info */ 231 scroll = *s_scroll; 232 if ((scroll <= choice) && (scroll + max_choice > choice) && 233 (scroll >= 0) && (scroll + max_choice <= item_count())) { 234 first_item = scroll; 235 choice = choice - scroll; 236 } else { 237 scroll = 0; 238 } 239 if ((choice >= max_choice)) { 240 if (choice >= item_count() - max_choice / 2) 241 scroll = first_item = item_count() - max_choice; 242 else 243 scroll = first_item = choice - max_choice / 2; 244 choice = choice - scroll; 245 } 246 247 /* Print the menu */ 248 for (i = 0; i < max_choice; i++) { 249 print_item(first_item + i, i, i == choice); 250 } 251 252 wnoutrefresh(menu); 253 254 print_arrows(dialog, item_count(), scroll, 255 box_y, box_x + item_x + 1, menu_height); 256 257 print_buttons(dialog, height, width, 0); 258 wmove(menu, choice, item_x + 1); 259 wrefresh(menu); 260 261 while (key != KEY_ESC) { 262 key = wgetch(menu); 263 264 if (key < 256 && isalpha(key)) 265 key = tolower(key); 266 267 if (strchr("ynmh", key)) 268 i = max_choice; 269 else { 270 for (i = choice + 1; i < max_choice; i++) { 271 item_set(scroll + i); 272 j = first_alpha(item_str(), "YyNnMmHh"); 273 if (key == tolower(item_str()[j])) 274 break; 275 } 276 if (i == max_choice) 277 for (i = 0; i < max_choice; i++) { 278 item_set(scroll + i); 279 j = first_alpha(item_str(), "YyNnMmHh"); 280 if (key == tolower(item_str()[j])) 281 break; 282 } 283 } 284 285 if (item_count() != 0 && 286 (i < max_choice || 287 key == KEY_UP || key == KEY_DOWN || 288 key == '-' || key == '+' || 289 key == KEY_PPAGE || key == KEY_NPAGE)) { 290 /* Remove highligt of current item */ 291 print_item(scroll + choice, choice, FALSE); 292 293 if (key == KEY_UP || key == '-') { 294 if (choice < 2 && scroll) { 295 /* Scroll menu down */ 296 do_scroll(menu, &scroll, -1); 297 298 print_item(scroll, 0, FALSE); 299 } else 300 choice = MAX(choice - 1, 0); 301 302 } else if (key == KEY_DOWN || key == '+') { 303 print_item(scroll+choice, choice, FALSE); 304 305 if ((choice > max_choice - 3) && 306 (scroll + max_choice < item_count())) { 307 /* Scroll menu up */ 308 do_scroll(menu, &scroll, 1); 309 310 print_item(scroll+max_choice - 1, 311 max_choice - 1, FALSE); 312 } else 313 choice = MIN(choice + 1, max_choice - 1); 314 315 } else if (key == KEY_PPAGE) { 316 scrollok(menu, TRUE); 317 for (i = 0; (i < max_choice); i++) { 318 if (scroll > 0) { 319 do_scroll(menu, &scroll, -1); 320 print_item(scroll, 0, FALSE); 321 } else { 322 if (choice > 0) 323 choice--; 324 } 325 } 326 327 } else if (key == KEY_NPAGE) { 328 for (i = 0; (i < max_choice); i++) { 329 if (scroll + max_choice < item_count()) { 330 do_scroll(menu, &scroll, 1); 331 print_item(scroll+max_choice-1, 332 max_choice - 1, FALSE); 333 } else { 334 if (choice + 1 < max_choice) 335 choice++; 336 } 337 } 338 } else 339 choice = i; 340 341 print_item(scroll + choice, choice, TRUE); 342 343 print_arrows(dialog, item_count(), scroll, 344 box_y, box_x + item_x + 1, menu_height); 345 346 wnoutrefresh(dialog); 347 wrefresh(menu); 348 349 continue; /* wait for another key press */ 350 } 351 352 switch (key) { 353 case KEY_LEFT: 354 case TAB: 355 case KEY_RIGHT: 356 button = ((key == KEY_LEFT ? --button : ++button) < 0) 357 ? 4 : (button > 4 ? 0 : button); 358 359 print_buttons(dialog, height, width, button); 360 wrefresh(menu); 361 break; 362 case ' ': 363 case 's': 364 case 'y': 365 case 'n': 366 case 'm': 367 case '/': 368 case 'h': 369 case '?': 370 case 'z': 371 case '\n': 372 /* save scroll info */ 373 *s_scroll = scroll; 374 delwin(menu); 375 delwin(dialog); 376 item_set(scroll + choice); 377 item_set_selected(1); 378 switch (key) { 379 case 'h': 380 case '?': 381 return 2; 382 case 's': 383 case 'y': 384 return 5; 385 case 'n': 386 return 6; 387 case 'm': 388 return 7; 389 case ' ': 390 return 8; 391 case '/': 392 return 9; 393 case 'z': 394 return 10; 395 case '\n': 396 return button; 397 } 398 return 0; 399 case 'e': 400 case 'x': 401 key = KEY_ESC; 402 break; 403 case KEY_ESC: 404 key = on_key_esc(menu); 405 break; 406 case KEY_RESIZE: 407 on_key_resize(); 408 delwin(menu); 409 delwin(dialog); 410 goto do_resize; 411 } 412 } 413 delwin(menu); 414 delwin(dialog); 415 return key; /* ESC pressed */ 416 } 417