2 * menubox.c -- implements the menu box
4 * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
5 * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
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.
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.
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.
23 * Changes by Clifford Wolf (god@clifford.at)
27 * *) A bugfix for the Page-Down problem
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
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!
45 * *) Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
46 * and menus change their size on the fly.
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.
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.
61 static int menu_width, item_x;
66 static void do_print_item(WINDOW * win, const char *item, int line_y,
67 int selected, int hotkey)
70 char *menu_item = malloc(menu_width + 1);
72 strncpy(menu_item, item, menu_width - item_x);
73 menu_item[menu_width - item_x] = '\0';
74 j = first_alpha(menu_item, "YyNnMmHh");
76 /* Clear 'residue' of last item */
77 wattrset(win, dlg.menubox.atr);
78 wmove(win, line_y, 0);
82 for (i = 0; i < menu_width; i++)
88 wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
89 mvwaddstr(win, line_y, item_x, menu_item);
91 wattrset(win, selected ? dlg.tag_key_selected.atr
93 mvwaddch(win, line_y, item_x + j, menu_item[j]);
96 wmove(win, line_y, item_x + 1);
102 #define print_item(index, choice, selected) \
105 do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \
109 * Print the scroll indicators.
111 static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
116 getyx(win, cur_y, cur_x);
121 wattrset(win, dlg.uarrow.atr);
122 waddch(win, ACS_UARROW);
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);
136 if ((height < item_no) && (scroll + height < item_no)) {
137 wattrset(win, dlg.darrow.atr);
138 waddch(win, ACS_DARROW);
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);
148 wmove(win, cur_y, cur_x);
153 * Display the termination buttons.
155 static void print_buttons(WINDOW * win, int height, int width, int selected)
157 int x = width / 2 - 16;
160 print_button(win, "Select", y, x, selected == 0);
161 print_button(win, " Exit ", y, x + 12, selected == 1);
162 print_button(win, " Help ", y, x + 24, selected == 2);
164 wmove(win, y, x + 1 + 12 * selected);
168 /* scroll up n lines (n may be negative) */
169 static void do_scroll(WINDOW *win, int *scroll, int n)
174 scrollok(win, FALSE);
175 *scroll = *scroll + n;
180 * Display a menu for choosing among a number of options
182 int dialog_menu(const char *title, const char *prompt,
183 const void *selected, int *s_scroll)
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;
192 height = getmaxy(stdscr);
193 width = getmaxx(stdscr);
194 if (height < 15 || width < 65)
195 return -ERRDISPLAYTOOSMALL;
199 menu_height = height - 10;
201 max_choice = MIN(menu_height, item_count());
203 /* center dialog box on screen */
204 x = (COLS - width) / 2;
205 y = (LINES - height) / 2;
207 draw_shadow(stdscr, y, x, height, width);
209 dialog = newwin(height, width, y, x);
210 keypad(dialog, TRUE);
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);
222 print_title(dialog, title, width);
224 wattrset(dialog, dlg.dialog.atr);
225 print_autowrap(dialog, prompt, width - 2, 1, 3);
227 menu_width = width - 6;
228 box_y = height - menu_height - 5;
229 box_x = (width - menu_width) / 2 - 1;
231 /* create new window for the menu */
232 menu = subwin(dialog, menu_height, menu_width,
233 y + box_y + 1, x + box_x + 1);
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);
240 if (menu_width >= 80)
241 item_x = (menu_width - 70) / 2;
245 /* Set choice to default item */
247 if (selected && (selected == item_data()))
249 /* get the saved scroll info */
251 if ((scroll <= choice) && (scroll + max_choice > choice) &&
252 (scroll >= 0) && (scroll + max_choice <= item_count())) {
254 choice = choice - scroll;
258 if ((choice >= max_choice)) {
259 if (choice >= item_count() - max_choice / 2)
260 scroll = first_item = item_count() - max_choice;
262 scroll = first_item = choice - max_choice / 2;
263 choice = choice - scroll;
267 for (i = 0; i < max_choice; i++) {
268 print_item(first_item + i, i, i == choice);
273 print_arrows(dialog, item_count(), scroll,
274 box_y, box_x + item_x + 1, menu_height);
276 print_buttons(dialog, height, width, 0);
277 wmove(menu, choice, item_x + 1);
280 while (key != KEY_ESC) {
283 if (key < 256 && isalpha(key))
286 if (strchr("ynmh", key))
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]))
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]))
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);
311 if (key == KEY_UP || key == '-') {
312 if (choice < 2 && scroll) {
313 /* Scroll menu down */
314 do_scroll(menu, &scroll, -1);
316 print_item(scroll, 0, FALSE);
318 choice = MAX(choice - 1, 0);
320 } else if (key == KEY_DOWN || key == '+') {
321 print_item(scroll+choice, choice, FALSE);
323 if ((choice > max_choice - 3) &&
324 (scroll + max_choice < item_count())) {
326 do_scroll(menu, &scroll, 1);
328 print_item(scroll+max_choice - 1,
329 max_choice - 1, FALSE);
331 choice = MIN(choice + 1, max_choice - 1);
333 } else if (key == KEY_PPAGE) {
334 scrollok(menu, TRUE);
335 for (i = 0; (i < max_choice); i++) {
337 do_scroll(menu, &scroll, -1);
338 print_item(scroll, 0, FALSE);
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);
352 if (choice + 1 < max_choice)
359 print_item(scroll + choice, choice, TRUE);
361 print_arrows(dialog, item_count(), scroll,
362 box_y, box_x + item_x + 1, menu_height);
364 wnoutrefresh(dialog);
367 continue; /* wait for another key press */
374 button = ((key == KEY_LEFT ? --button : ++button) < 0)
375 ? 2 : (button > 2 ? 0 : button);
377 print_buttons(dialog, height, width, button);
386 /* save scroll info */
390 item_set(scroll + choice);
391 item_set_selected(1);
414 item_set(scroll + choice);
415 item_set_selected(1);
422 key = on_key_esc(menu);
433 return key; /* ESC pressed */