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menubox.c 11 KB

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