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1 office 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 }