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0a9064fb MY |
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 - 28; | |
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 | print_button(win, gettext(" Save "), y, x + 36, selected == 3); | |
164 | print_button(win, gettext(" Load "), y, x + 48, selected == 4); | |
165 | ||
166 | wmove(win, y, x + 1 + 12 * selected); | |
167 | wrefresh(win); | |
168 | } | |
169 | ||
170 | /* scroll up n lines (n may be negative) */ | |
171 | static void do_scroll(WINDOW *win, int *scroll, int n) | |
172 | { | |
173 | /* Scroll menu up */ | |
174 | scrollok(win, TRUE); | |
175 | wscrl(win, n); | |
176 | scrollok(win, FALSE); | |
177 | *scroll = *scroll + n; | |
178 | wrefresh(win); | |
179 | } | |
180 | ||
181 | /* | |
182 | * Display a menu for choosing among a number of options | |
183 | */ | |
184 | int dialog_menu(const char *title, const char *prompt, | |
185 | const void *selected, int *s_scroll) | |
186 | { | |
187 | int i, j, x, y, box_x, box_y; | |
188 | int height, width, menu_height; | |
189 | int key = 0, button = 0, scroll = 0, choice = 0; | |
190 | int first_item = 0, max_choice; | |
191 | WINDOW *dialog, *menu; | |
192 | ||
193 | do_resize: | |
194 | height = getmaxy(stdscr); | |
195 | width = getmaxx(stdscr); | |
196 | if (height < MENUBOX_HEIGTH_MIN || width < MENUBOX_WIDTH_MIN) | |
197 | return -ERRDISPLAYTOOSMALL; | |
198 | ||
199 | height -= 4; | |
200 | width -= 5; | |
201 | menu_height = height - 10; | |
202 | ||
203 | max_choice = MIN(menu_height, item_count()); | |
204 | ||
205 | /* center dialog box on screen */ | |
206 | x = (getmaxx(stdscr) - width) / 2; | |
207 | y = (getmaxy(stdscr) - height) / 2; | |
208 | ||
209 | draw_shadow(stdscr, y, x, height, width); | |
210 | ||
211 | dialog = newwin(height, width, y, x); | |
212 | keypad(dialog, TRUE); | |
213 | ||
214 | draw_box(dialog, 0, 0, height, width, | |
215 | dlg.dialog.atr, dlg.border.atr); | |
216 | wattrset(dialog, dlg.border.atr); | |
217 | mvwaddch(dialog, height - 3, 0, ACS_LTEE); | |
218 | for (i = 0; i < width - 2; i++) | |
219 | waddch(dialog, ACS_HLINE); | |
220 | wattrset(dialog, dlg.dialog.atr); | |
221 | wbkgdset(dialog, dlg.dialog.atr & A_COLOR); | |
222 | waddch(dialog, ACS_RTEE); | |
223 | ||
224 | print_title(dialog, title, width); | |
225 | ||
226 | wattrset(dialog, dlg.dialog.atr); | |
227 | print_autowrap(dialog, prompt, width - 2, 1, 3); | |
228 | ||
229 | menu_width = width - 6; | |
230 | box_y = height - menu_height - 5; | |
231 | box_x = (width - menu_width) / 2 - 1; | |
232 | ||
233 | /* create new window for the menu */ | |
234 | menu = subwin(dialog, menu_height, menu_width, | |
235 | y + box_y + 1, x + box_x + 1); | |
236 | keypad(menu, TRUE); | |
237 | ||
238 | /* draw a box around the menu items */ | |
239 | draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2, | |
240 | dlg.menubox_border.atr, dlg.menubox.atr); | |
241 | ||
242 | if (menu_width >= 80) | |
243 | item_x = (menu_width - 70) / 2; | |
244 | else | |
245 | item_x = 4; | |
246 | ||
247 | /* Set choice to default item */ | |
248 | item_foreach() | |
249 | if (selected && (selected == item_data())) | |
250 | choice = item_n(); | |
251 | /* get the saved scroll info */ | |
252 | scroll = *s_scroll; | |
253 | if ((scroll <= choice) && (scroll + max_choice > choice) && | |
254 | (scroll >= 0) && (scroll + max_choice <= item_count())) { | |
255 | first_item = scroll; | |
256 | choice = choice - scroll; | |
257 | } else { | |
258 | scroll = 0; | |
259 | } | |
260 | if ((choice >= max_choice)) { | |
261 | if (choice >= item_count() - max_choice / 2) | |
262 | scroll = first_item = item_count() - max_choice; | |
263 | else | |
264 | scroll = first_item = choice - max_choice / 2; | |
265 | choice = choice - scroll; | |
266 | } | |
267 | ||
268 | /* Print the menu */ | |
269 | for (i = 0; i < max_choice; i++) { | |
270 | print_item(first_item + i, i, i == choice); | |
271 | } | |
272 | ||
273 | wnoutrefresh(menu); | |
274 | ||
275 | print_arrows(dialog, item_count(), scroll, | |
276 | box_y, box_x + item_x + 1, menu_height); | |
277 | ||
278 | print_buttons(dialog, height, width, 0); | |
279 | wmove(menu, choice, item_x + 1); | |
280 | wrefresh(menu); | |
281 | ||
282 | while (key != KEY_ESC) { | |
283 | key = wgetch(menu); | |
284 | ||
285 | if (key < 256 && isalpha(key)) | |
286 | key = tolower(key); | |
287 | ||
288 | if (strchr("ynmh", key)) | |
289 | i = max_choice; | |
290 | else { | |
291 | for (i = choice + 1; i < max_choice; i++) { | |
292 | item_set(scroll + i); | |
293 | j = first_alpha(item_str(), "YyNnMmHh"); | |
294 | if (key == tolower(item_str()[j])) | |
295 | break; | |
296 | } | |
297 | if (i == max_choice) | |
298 | for (i = 0; i < max_choice; i++) { | |
299 | item_set(scroll + i); | |
300 | j = first_alpha(item_str(), "YyNnMmHh"); | |
301 | if (key == tolower(item_str()[j])) | |
302 | break; | |
303 | } | |
304 | } | |
305 | ||
306 | if (item_count() != 0 && | |
307 | (i < max_choice || | |
308 | key == KEY_UP || key == KEY_DOWN || | |
309 | key == '-' || key == '+' || | |
310 | key == KEY_PPAGE || key == KEY_NPAGE)) { | |
311 | /* Remove highligt of current item */ | |
312 | print_item(scroll + choice, choice, FALSE); | |
313 | ||
314 | if (key == KEY_UP || key == '-') { | |
315 | if (choice < 2 && scroll) { | |
316 | /* Scroll menu down */ | |
317 | do_scroll(menu, &scroll, -1); | |
318 | ||
319 | print_item(scroll, 0, FALSE); | |
320 | } else | |
321 | choice = MAX(choice - 1, 0); | |
322 | ||
323 | } else if (key == KEY_DOWN || key == '+') { | |
324 | print_item(scroll+choice, choice, FALSE); | |
325 | ||
326 | if ((choice > max_choice - 3) && | |
327 | (scroll + max_choice < item_count())) { | |
328 | /* Scroll menu up */ | |
329 | do_scroll(menu, &scroll, 1); | |
330 | ||
331 | print_item(scroll+max_choice - 1, | |
332 | max_choice - 1, FALSE); | |
333 | } else | |
334 | choice = MIN(choice + 1, max_choice - 1); | |
335 | ||
336 | } else if (key == KEY_PPAGE) { | |
337 | scrollok(menu, TRUE); | |
338 | for (i = 0; (i < max_choice); i++) { | |
339 | if (scroll > 0) { | |
340 | do_scroll(menu, &scroll, -1); | |
341 | print_item(scroll, 0, FALSE); | |
342 | } else { | |
343 | if (choice > 0) | |
344 | choice--; | |
345 | } | |
346 | } | |
347 | ||
348 | } else if (key == KEY_NPAGE) { | |
349 | for (i = 0; (i < max_choice); i++) { | |
350 | if (scroll + max_choice < item_count()) { | |
351 | do_scroll(menu, &scroll, 1); | |
352 | print_item(scroll+max_choice-1, | |
353 | max_choice - 1, FALSE); | |
354 | } else { | |
355 | if (choice + 1 < max_choice) | |
356 | choice++; | |
357 | } | |
358 | } | |
359 | } else | |
360 | choice = i; | |
361 | ||
362 | print_item(scroll + choice, choice, TRUE); | |
363 | ||
364 | print_arrows(dialog, item_count(), scroll, | |
365 | box_y, box_x + item_x + 1, menu_height); | |
366 | ||
367 | wnoutrefresh(dialog); | |
368 | wrefresh(menu); | |
369 | ||
370 | continue; /* wait for another key press */ | |
371 | } | |
372 | ||
373 | switch (key) { | |
374 | case KEY_LEFT: | |
375 | case TAB: | |
376 | case KEY_RIGHT: | |
377 | button = ((key == KEY_LEFT ? --button : ++button) < 0) | |
378 | ? 4 : (button > 4 ? 0 : button); | |
379 | ||
380 | print_buttons(dialog, height, width, button); | |
381 | wrefresh(menu); | |
382 | break; | |
383 | case ' ': | |
384 | case 's': | |
385 | case 'y': | |
386 | case 'n': | |
387 | case 'm': | |
388 | case '/': | |
389 | case 'h': | |
390 | case '?': | |
391 | case 'z': | |
392 | case '\n': | |
393 | /* save scroll info */ | |
394 | *s_scroll = scroll; | |
395 | delwin(menu); | |
396 | delwin(dialog); | |
397 | item_set(scroll + choice); | |
398 | item_set_selected(1); | |
399 | switch (key) { | |
400 | case 'h': | |
401 | case '?': | |
402 | return 2; | |
403 | case 's': | |
404 | case 'y': | |
405 | return 5; | |
406 | case 'n': | |
407 | return 6; | |
408 | case 'm': | |
409 | return 7; | |
410 | case ' ': | |
411 | return 8; | |
412 | case '/': | |
413 | return 9; | |
414 | case 'z': | |
415 | return 10; | |
416 | case '\n': | |
417 | return button; | |
418 | } | |
419 | return 0; | |
420 | case 'e': | |
421 | case 'x': | |
422 | key = KEY_ESC; | |
423 | break; | |
424 | case KEY_ESC: | |
425 | key = on_key_esc(menu); | |
426 | break; | |
427 | case KEY_RESIZE: | |
428 | on_key_resize(); | |
429 | delwin(menu); | |
430 | delwin(dialog); | |
431 | goto do_resize; | |
432 | } | |
433 | } | |
434 | delwin(menu); | |
435 | delwin(dialog); | |
436 | return key; /* ESC pressed */ | |
437 | } |