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 /*
23 * Changes by Clifford Wolf (god@clifford.at)
24 *
25 * [ 1998-06-13 ]
26 *
27 * *) A bugfix for the Page-Down problem
28 *
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
32 * it).
33 *
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!
42 *
43 * [ 1998-06-14 ]
44 *
45 * *) Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
46 * and menus change their size on the fly.
47 *
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.
51 *
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.
57 */
58
59 #include "dialog.h"
60
61 static int menu_width, item_x;
62
63 /*
64 * Print menu item
65 */
66 static void do_print_item(WINDOW * win, const char *item, int line_y,
67 int selected, int hotkey)
68 {
69 int j;
70 char *menu_item = malloc(menu_width + 1);
71
72 strncpy(menu_item, item, menu_width - item_x);
73 menu_item[menu_width - item_x] = '\0';
74 j = first_alpha(menu_item, "YyNnMmHh");
75
76 /* Clear 'residue' of last item */
77 wattrset(win, dlg.menubox.atr);
78 wmove(win, line_y, 0);
79 #if OLD_NCURSES
80 {
81 int i;
82 for (i = 0; i < menu_width; i++)
83 waddch(win, ' ');
84 }
85 #else
86 wclrtoeol(win);
87 #endif
88 wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
89 mvwaddstr(win, line_y, item_x, menu_item);
90 if (hotkey) {
91 wattrset(win, selected ? dlg.tag_key_selected.atr
92 : dlg.tag_key.atr);
93 mvwaddch(win, line_y, item_x + j, menu_item[j]);
94 }
95 if (selected) {
96 wmove(win, line_y, item_x + 1);
97 }
98 free(menu_item);
99 wrefresh(win);
100 }
101
102 #define print_item(index, choice, selected) \
103 do { \
104 item_set(index); \
105 do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \
106 } while (0)
107
108 /*
109 * Print the scroll indicators.
110 */
111 static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
112 int height)
113 {
114 int cur_y, cur_x;
115
116 getyx(win, cur_y, cur_x);
117
118 wmove(win, y, x);
119
120 if (scroll > 0) {
121 wattrset(win, dlg.uarrow.atr);
122 waddch(win, ACS_UARROW);
123 waddstr(win, "(-)");
124 } else {
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);
130 }
131
132 y = y + height + 1;
133 wmove(win, y, x);
134 wrefresh(win);
135
136 if ((height < item_no) && (scroll + height < item_no)) {
137 wattrset(win, dlg.darrow.atr);
138 waddch(win, ACS_DARROW);
139 waddstr(win, "(+)");
140 } else {
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);
146 }
147
148 wmove(win, cur_y, cur_x);
149 wrefresh(win);
150 }
151
152 /*
153 * Display the termination buttons.
154 */
155 static void print_buttons(WINDOW * win, int height, int width, int selected)
156 {
157 int x = width / 2 - 16;
158 int y = height - 2;
159
160 print_button(win, gettext("Select"), y, x, selected == 0);
161 print_button(win, gettext(" Exit "), y, x + 12, selected == 1);
162 print_button(win, gettext(" Help "), y, x + 24, selected == 2);
163
164 wmove(win, y, x + 1 + 12 * selected);
165 wrefresh(win);
166 }
167
168 /* scroll up n lines (n may be negative) */
169 static void do_scroll(WINDOW *win, int *scroll, int n)
170 {
171 /* Scroll menu up */
172 scrollok(win, TRUE);
173 wscrl(win, n);
174 scrollok(win, FALSE);
175 *scroll = *scroll + n;
176 wrefresh(win);
177 }
178
179 /*
180 * Display a menu for choosing among a number of options
181 */
182 int dialog_menu(const char *title, const char *prompt,
183 const void *selected, int *s_scroll)
184 {
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;
190
191 do_resize:
192 height = getmaxy(stdscr);
193 width = getmaxx(stdscr);
194 if (height < 15 || width < 65)
195 return -ERRDISPLAYTOOSMALL;
196
197 height -= 4;
198 width -= 5;
199 menu_height = height - 10;
200
201 max_choice = MIN(menu_height, item_count());
202
203 /* center dialog box on screen */
204 x = (COLS - width) / 2;
205 y = (LINES - height) / 2;
206
207 draw_shadow(stdscr, y, x, height, width);
208
209 dialog = newwin(height, width, y, x);
210 keypad(dialog, TRUE);
211
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);
221
222 print_title(dialog, title, width);
223
224 wattrset(dialog, dlg.dialog.atr);
225 print_autowrap(dialog, prompt, width - 2, 1, 3);
226
227 menu_width = width - 6;
228 box_y = height - menu_height - 5;
229 box_x = (width - menu_width) / 2 - 1;
230
231 /* create new window for the menu */
232 menu = subwin(dialog, menu_height, menu_width,
233 y + box_y + 1, x + box_x + 1);
234 keypad(menu, TRUE);
235
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);
239
240 if (menu_width >= 80)
241 item_x = (menu_width - 70) / 2;
242 else
243 item_x = 4;
244
245 /* Set choice to default item */
246 item_foreach()
247 if (selected && (selected == item_data()))
248 choice = item_n();
249 /* get the saved scroll info */
250 scroll = *s_scroll;
251 if ((scroll <= choice) && (scroll + max_choice > choice) &&
252 (scroll >= 0) && (scroll + max_choice <= item_count())) {
253 first_item = scroll;
254 choice = choice - scroll;
255 } else {
256 scroll = 0;
257 }
258 if ((choice >= max_choice)) {
259 if (choice >= item_count() - max_choice / 2)
260 scroll = first_item = item_count() - max_choice;
261 else
262 scroll = first_item = choice - max_choice / 2;
263 choice = choice - scroll;
264 }
265
266 /* Print the menu */
267 for (i = 0; i < max_choice; i++) {
268 print_item(first_item + i, i, i == choice);
269 }
270
271 wnoutrefresh(menu);
272
273 print_arrows(dialog, item_count(), scroll,
274 box_y, box_x + item_x + 1, menu_height);
275
276 print_buttons(dialog, height, width, 0);
277 wmove(menu, choice, item_x + 1);
278 wrefresh(menu);
279
280 while (key != KEY_ESC) {
281 key = wgetch(menu);
282
283 if (key < 256 && isalpha(key))
284 key = tolower(key);
285
286 if (strchr("ynmh", key))
287 i = max_choice;
288 else {
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]))
293 break;
294 }
295 if (i == max_choice)
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]))
300 break;
301 }
302 }
303
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);
310
311 if (key == KEY_UP || key == '-') {
312 if (choice < 2 && scroll) {
313 /* Scroll menu down */
314 do_scroll(menu, &scroll, -1);
315
316 print_item(scroll, 0, FALSE);
317 } else
318 choice = MAX(choice - 1, 0);
319
320 } else if (key == KEY_DOWN || key == '+') {
321 print_item(scroll+choice, choice, FALSE);
322
323 if ((choice > max_choice - 3) &&
324 (scroll + max_choice < item_count())) {
325 /* Scroll menu up */
326 do_scroll(menu, &scroll, 1);
327
328 print_item(scroll+max_choice - 1,
329 max_choice - 1, FALSE);
330 } else
331 choice = MIN(choice + 1, max_choice - 1);
332
333 } else if (key == KEY_PPAGE) {
334 scrollok(menu, TRUE);
335 for (i = 0; (i < max_choice); i++) {
336 if (scroll > 0) {
337 do_scroll(menu, &scroll, -1);
338 print_item(scroll, 0, FALSE);
339 } else {
340 if (choice > 0)
341 choice--;
342 }
343 }
344
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);
351 } else {
352 if (choice + 1 < max_choice)
353 choice++;
354 }
355 }
356 } else
357 choice = i;
358
359 print_item(scroll + choice, choice, TRUE);
360
361 print_arrows(dialog, item_count(), scroll,
362 box_y, box_x + item_x + 1, menu_height);
363
364 wnoutrefresh(dialog);
365 wrefresh(menu);
366
367 continue; /* wait for another key press */
368 }
369
370 switch (key) {
371 case KEY_LEFT:
372 case TAB:
373 case KEY_RIGHT:
374 button = ((key == KEY_LEFT ? --button : ++button) < 0)
375 ? 2 : (button > 2 ? 0 : button);
376
377 print_buttons(dialog, height, width, button);
378 wrefresh(menu);
379 break;
380 case ' ':
381 case 's':
382 case 'y':
383 case 'n':
384 case 'm':
385 case '/':
386 /* save scroll info */
387 *s_scroll = scroll;
388 delwin(menu);
389 delwin(dialog);
390 item_set(scroll + choice);
391 item_set_selected(1);
392 switch (key) {
393 case 's':
394 return 3;
395 case 'y':
396 return 3;
397 case 'n':
398 return 4;
399 case 'm':
400 return 5;
401 case ' ':
402 return 6;
403 case '/':
404 return 7;
405 }
406 return 0;
407 case 'h':
408 case '?':
409 button = 2;
410 case '\n':
411 *s_scroll = scroll;
412 delwin(menu);
413 delwin(dialog);
414 item_set(scroll + choice);
415 item_set_selected(1);
416 return button;
417 case 'e':
418 case 'x':
419 key = KEY_ESC;
420 break;
421 case KEY_ESC:
422 key = on_key_esc(menu);
423 break;
424 case KEY_RESIZE:
425 on_key_resize();
426 delwin(menu);
427 delwin(dialog);
428 goto do_resize;
429 }
430 }
431 delwin(menu);
432 delwin(dialog);
433 return key; /* ESC pressed */
434 }
435
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