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 | #define ITEM_IDENT 1 /* Indent of menu entries. Fixed for all menus */ |
62 | static int menu_width; |
63 | |
64 | /* |
65 | * Print menu item |
66 | */ |
67 | static void do_print_item(WINDOW * win, const char *item, int choice, |
68 | int selected, int hotkey) |
69 | { |
70 | int j; |
71 | char *menu_item = malloc(menu_width + 1); |
72 | |
73 | strncpy(menu_item, item, menu_width - ITEM_IDENT); |
74 | menu_item[menu_width] = 0; |
75 | j = first_alpha(menu_item, "YyNnMmHh"); |
76 | |
77 | /* Clear 'residue' of last item */ |
78 | wattrset(win, menubox_attr); |
79 | wmove(win, choice, 0); |
80 | #if OLD_NCURSES |
81 | { |
82 | int i; |
83 | for (i = 0; i < menu_width; i++) |
84 | waddch(win, ' '); |
85 | } |
86 | #else |
87 | wclrtoeol(win); |
88 | #endif |
89 | wattrset(win, selected ? item_selected_attr : item_attr); |
90 | mvwaddstr(win, choice, ITEM_IDENT, menu_item); |
91 | if (hotkey) { |
92 | wattrset(win, selected ? tag_key_selected_attr : tag_key_attr); |
93 | mvwaddch(win, choice, ITEM_IDENT + j, menu_item[j]); |
94 | } |
95 | if (selected) { |
96 | wmove(win, choice, ITEM_IDENT + 1); |
97 | } |
98 | free(menu_item); |
99 | wrefresh(win); |
100 | } |
101 | |
102 | #define print_item(index, choice, selected) \ |
103 | do {\ |
104 | int hotkey = (items[(index) * 2][0] != ':'); \ |
105 | do_print_item(menu, items[(index) * 2 + 1], choice, selected, hotkey); \ |
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, uarrow_attr); |
122 | waddch(win, ACS_UARROW); |
123 | waddstr(win, "(-)"); |
124 | } else { |
125 | wattrset(win, menubox_attr); |
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, darrow_attr); |
138 | waddch(win, ACS_DARROW); |
139 | waddstr(win, "(+)"); |
140 | } else { |
141 | wattrset(win, menubox_border_attr); |
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, "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); |
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, int height, int width, |
183 | int menu_height, const char *current, int item_no, |
184 | const char *const *items) |
185 | { |
186 | int i, j, x, y, box_x, box_y; |
187 | int key = 0, button = 0, scroll = 0, choice = 0; |
188 | int first_item = 0, max_choice; |
189 | WINDOW *dialog, *menu; |
190 | FILE *f; |
191 | |
192 | max_choice = MIN(menu_height, item_no); |
193 | |
194 | /* center dialog box on screen */ |
195 | x = (COLS - width) / 2; |
196 | y = (LINES - height) / 2; |
197 | |
198 | draw_shadow(stdscr, y, x, height, width); |
199 | |
200 | dialog = newwin(height, width, y, x); |
201 | keypad(dialog, TRUE); |
202 | |
203 | draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr); |
204 | wattrset(dialog, border_attr); |
205 | mvwaddch(dialog, height - 3, 0, ACS_LTEE); |
206 | for (i = 0; i < width - 2; i++) |
207 | waddch(dialog, ACS_HLINE); |
208 | wattrset(dialog, dialog_attr); |
209 | wbkgdset(dialog, dialog_attr & A_COLOR); |
210 | waddch(dialog, ACS_RTEE); |
211 | |
212 | print_title(dialog, title, width); |
213 | |
214 | wattrset(dialog, dialog_attr); |
215 | print_autowrap(dialog, prompt, width - 2, 1, 3); |
216 | |
217 | menu_width = width - 6; |
218 | box_y = height - menu_height - 5; |
219 | box_x = (width - menu_width) / 2 - 1; |
220 | |
221 | /* create new window for the menu */ |
222 | menu = subwin(dialog, menu_height, menu_width, |
223 | y + box_y + 1, x + box_x + 1); |
224 | keypad(menu, TRUE); |
225 | |
226 | /* draw a box around the menu items */ |
227 | draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2, |
228 | menubox_border_attr, menubox_attr); |
229 | |
230 | /* Set choice to default item */ |
231 | for (i = 0; i < item_no; i++) |
232 | if (strcmp(current, items[i * 2]) == 0) |
233 | choice = i; |
234 | |
235 | /* get the scroll info from the temp file */ |
236 | if ((f = fopen("lxdialog.scrltmp", "r")) != NULL) { |
237 | if ((fscanf(f, "%d\n", &scroll) == 1) && (scroll <= choice) && |
238 | (scroll + max_choice > choice) && (scroll >= 0) && |
239 | (scroll + max_choice <= item_no)) { |
240 | first_item = scroll; |
241 | choice = choice - scroll; |
242 | fclose(f); |
243 | } else { |
244 | scroll = 0; |
245 | remove("lxdialog.scrltmp"); |
246 | fclose(f); |
247 | f = NULL; |
248 | } |
249 | } |
250 | if ((choice >= max_choice) || (f == NULL && choice >= max_choice / 2)) { |
251 | if (choice >= item_no - max_choice / 2) |
252 | scroll = first_item = item_no - max_choice; |
253 | else |
254 | scroll = first_item = choice - max_choice / 2; |
255 | choice = choice - scroll; |
256 | } |
257 | |
258 | /* Print the menu */ |
259 | for (i = 0; i < max_choice; i++) { |
260 | print_item(first_item + i, i, i == choice); |
261 | } |
262 | |
263 | wnoutrefresh(menu); |
264 | |
265 | print_arrows(dialog, item_no, scroll, |
266 | box_y, box_x + ITEM_IDENT + 1, menu_height); |
267 | |
268 | print_buttons(dialog, height, width, 0); |
269 | wmove(menu, choice, ITEM_IDENT + 1); |
270 | wrefresh(menu); |
271 | |
272 | while (key != ESC) { |
273 | key = wgetch(menu); |
274 | |
275 | if (key < 256 && isalpha(key)) |
276 | key = tolower(key); |
277 | |
278 | if (strchr("ynmh", key)) |
279 | i = max_choice; |
280 | else { |
281 | for (i = choice + 1; i < max_choice; i++) { |
282 | j = first_alpha(items[(scroll + i) * 2 + 1], "YyNnMmHh"); |
283 | if (key == tolower(items[(scroll + i) * 2 + 1][j])) |
284 | break; |
285 | } |
286 | if (i == max_choice) |
287 | for (i = 0; i < max_choice; i++) { |
288 | j = first_alpha(items [(scroll + i) * 2 + 1], "YyNnMmHh"); |
289 | if (key == tolower(items[(scroll + i) * 2 + 1][j])) |
290 | break; |
291 | } |
292 | } |
293 | |
294 | if (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_no)) { |
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_no) { |
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_no, scroll, |
352 | box_y, box_x + ITEM_IDENT + 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 | ? 2 : (button > 2 ? 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 | /* save scroll info */ |
377 | if ((f = fopen("lxdialog.scrltmp", "w")) != NULL) { |
378 | fprintf(f, "%d\n", scroll); |
379 | fclose(f); |
380 | } |
381 | delwin(dialog); |
382 | fprintf(stderr, "%s\n", items[(scroll + choice) * 2]); |
383 | switch (key) { |
384 | case 's': |
385 | return 3; |
386 | case 'y': |
387 | return 3; |
388 | case 'n': |
389 | return 4; |
390 | case 'm': |
391 | return 5; |
392 | case ' ': |
393 | return 6; |
394 | case '/': |
395 | return 7; |
396 | } |
397 | return 0; |
398 | case 'h': |
399 | case '?': |
400 | button = 2; |
401 | case '\n': |
402 | delwin(dialog); |
403 | if (button == 2) |
404 | fprintf(stderr, "%s \"%s\"\n", |
405 | items[(scroll + choice) * 2], |
406 | items[(scroll + choice) * 2 + 1] + |
407 | first_alpha(items [(scroll + choice) * 2 + 1], "")); |
408 | else |
409 | fprintf(stderr, "%s\n", |
410 | items[(scroll + choice) * 2]); |
411 | |
412 | remove("lxdialog.scrltmp"); |
413 | return button; |
414 | case 'e': |
415 | case 'x': |
416 | key = ESC; |
417 | case ESC: |
418 | break; |
419 | } |
420 | } |
421 | |
422 | delwin(dialog); |
423 | remove("lxdialog.scrltmp"); |
424 | return -1; /* ESC pressed */ |
425 | } |
426 | |