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 */
do_print_item(WINDOW * win,const char * item,int choice,int selected,int hotkey)66 static void do_print_item(WINDOW * win, const char *item, int choice,
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] = 0;
74 j = first_alpha(menu_item, "YyNnMmHh");
75
76 /* Clear 'residue' of last item */
77 wattrset(win, menubox_attr);
78 wmove(win, choice, 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 ? item_selected_attr : item_attr);
89 mvwaddstr(win, choice, item_x, menu_item);
90 if (hotkey) {
91 wattrset(win, selected ? tag_key_selected_attr : tag_key_attr);
92 mvwaddch(win, choice, item_x + j, menu_item[j]);
93 }
94 if (selected) {
95 wmove(win, choice, item_x + 1);
96 }
97 free(menu_item);
98 wrefresh(win);
99 }
100
101 #define print_item(index, choice, selected) \
102 do {\
103 int hotkey = (items[(index) * 2][0] != ':'); \
104 do_print_item(menu, items[(index) * 2 + 1], choice, selected, hotkey); \
105 } while (0)
106
107 /*
108 * Print the scroll indicators.
109 */
print_arrows(WINDOW * win,int item_no,int scroll,int y,int x,int height)110 static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
111 int height)
112 {
113 int cur_y, cur_x;
114
115 getyx(win, cur_y, cur_x);
116
117 wmove(win, y, x);
118
119 if (scroll > 0) {
120 wattrset(win, uarrow_attr);
121 waddch(win, ACS_UARROW);
122 waddstr(win, "(-)");
123 } else {
124 wattrset(win, menubox_attr);
125 waddch(win, ACS_HLINE);
126 waddch(win, ACS_HLINE);
127 waddch(win, ACS_HLINE);
128 waddch(win, ACS_HLINE);
129 }
130
131 y = y + height + 1;
132 wmove(win, y, x);
133 wrefresh(win);
134
135 if ((height < item_no) && (scroll + height < item_no)) {
136 wattrset(win, darrow_attr);
137 waddch(win, ACS_DARROW);
138 waddstr(win, "(+)");
139 } else {
140 wattrset(win, menubox_border_attr);
141 waddch(win, ACS_HLINE);
142 waddch(win, ACS_HLINE);
143 waddch(win, ACS_HLINE);
144 waddch(win, ACS_HLINE);
145 }
146
147 wmove(win, cur_y, cur_x);
148 wrefresh(win);
149 }
150
151 /*
152 * Display the termination buttons.
153 */
print_buttons(WINDOW * win,int height,int width,int selected)154 static void print_buttons(WINDOW * win, int height, int width, int selected)
155 {
156 int x = width / 2 - 16;
157 int y = height - 2;
158
159 print_button(win, "Select", y, x, selected == 0);
160 print_button(win, " Exit ", y, x + 12, selected == 1);
161 print_button(win, " Help ", y, x + 24, selected == 2);
162
163 wmove(win, y, x + 1 + 12 * selected);
164 wrefresh(win);
165 }
166
167 /* scroll up n lines (n may be negative) */
do_scroll(WINDOW * win,int * scroll,int n)168 static void do_scroll(WINDOW *win, int *scroll, int n)
169 {
170 /* Scroll menu up */
171 scrollok(win, TRUE);
172 wscrl(win, n);
173 scrollok(win, FALSE);
174 *scroll = *scroll + n;
175 wrefresh(win);
176 }
177
178 /*
179 * Display a menu for choosing among a number of options
180 */
dialog_menu(const char * title,const char * prompt,int height,int width,int menu_height,const char * current,int item_no,const char * const * items)181 int dialog_menu(const char *title, const char *prompt, int height, int width,
182 int menu_height, const char *current, int item_no,
183 const char *const *items)
184 {
185 int i, j, x, y, box_x, box_y;
186 int key = 0, button = 0, scroll = 0, choice = 0;
187 int first_item = 0, max_choice;
188 WINDOW *dialog, *menu;
189 FILE *f;
190
191 max_choice = MIN(menu_height, item_no);
192
193 /* center dialog box on screen */
194 x = (COLS - width) / 2;
195 y = (LINES - height) / 2;
196
197 draw_shadow(stdscr, y, x, height, width);
198
199 dialog = newwin(height, width, y, x);
200 keypad(dialog, TRUE);
201
202 draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
203 wattrset(dialog, border_attr);
204 mvwaddch(dialog, height - 3, 0, ACS_LTEE);
205 for (i = 0; i < width - 2; i++)
206 waddch(dialog, ACS_HLINE);
207 wattrset(dialog, dialog_attr);
208 wbkgdset(dialog, dialog_attr & A_COLOR);
209 waddch(dialog, ACS_RTEE);
210
211 print_title(dialog, title, width);
212
213 wattrset(dialog, dialog_attr);
214 print_autowrap(dialog, prompt, width - 2, 1, 3);
215
216 menu_width = width - 6;
217 box_y = height - menu_height - 5;
218 box_x = (width - menu_width) / 2 - 1;
219
220 /* create new window for the menu */
221 menu = subwin(dialog, menu_height, menu_width,
222 y + box_y + 1, x + box_x + 1);
223 keypad(menu, TRUE);
224
225 /* draw a box around the menu items */
226 draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
227 menubox_border_attr, menubox_attr);
228
229 item_x = (menu_width - 70) / 2;
230
231 /* Set choice to default item */
232 for (i = 0; i < item_no; i++)
233 if (strcmp(current, items[i * 2]) == 0)
234 choice = i;
235
236 /* get the scroll info from the temp file */
237 if ((f = fopen("lxdialog.scrltmp", "r")) != NULL) {
238 if ((fscanf(f, "%d\n", &scroll) == 1) && (scroll <= choice) &&
239 (scroll + max_choice > choice) && (scroll >= 0) &&
240 (scroll + max_choice <= item_no)) {
241 first_item = scroll;
242 choice = choice - scroll;
243 fclose(f);
244 } else {
245 scroll = 0;
246 remove("lxdialog.scrltmp");
247 fclose(f);
248 f = NULL;
249 }
250 }
251 if ((choice >= max_choice) || (f == NULL && choice >= max_choice / 2)) {
252 if (choice >= item_no - max_choice / 2)
253 scroll = first_item = item_no - max_choice;
254 else
255 scroll = first_item = choice - max_choice / 2;
256 choice = choice - scroll;
257 }
258
259 /* Print the menu */
260 for (i = 0; i < max_choice; i++) {
261 print_item(first_item + i, i, i == choice);
262 }
263
264 wnoutrefresh(menu);
265
266 print_arrows(dialog, item_no, scroll,
267 box_y, box_x + item_x + 1, menu_height);
268
269 print_buttons(dialog, height, width, 0);
270 wmove(menu, choice, item_x + 1);
271 wrefresh(menu);
272
273 while (key != ESC) {
274 key = wgetch(menu);
275
276 if (key < 256 && isalpha(key))
277 key = tolower(key);
278
279 if (strchr("ynmh", key))
280 i = max_choice;
281 else {
282 for (i = choice + 1; i < max_choice; i++) {
283 j = first_alpha(items[(scroll + i) * 2 + 1], "YyNnMmHh");
284 if (key == tolower(items[(scroll + i) * 2 + 1][j]))
285 break;
286 }
287 if (i == max_choice)
288 for (i = 0; i < max_choice; i++) {
289 j = first_alpha(items [(scroll + i) * 2 + 1], "YyNnMmHh");
290 if (key == tolower(items[(scroll + i) * 2 + 1][j]))
291 break;
292 }
293 }
294
295 if (i < max_choice ||
296 key == KEY_UP || key == KEY_DOWN ||
297 key == '-' || key == '+' ||
298 key == KEY_PPAGE || key == KEY_NPAGE) {
299 /* Remove highligt of current item */
300 print_item(scroll + choice, choice, FALSE);
301
302 if (key == KEY_UP || key == '-') {
303 if (choice < 2 && scroll) {
304 /* Scroll menu down */
305 do_scroll(menu, &scroll, -1);
306
307 print_item(scroll, 0, FALSE);
308 } else
309 choice = MAX(choice - 1, 0);
310
311 } else if (key == KEY_DOWN || key == '+') {
312 print_item(scroll+choice, choice, FALSE);
313
314 if ((choice > max_choice - 3) &&
315 (scroll + max_choice < item_no)) {
316 /* Scroll menu up */
317 do_scroll(menu, &scroll, 1);
318
319 print_item(scroll+max_choice - 1,
320 max_choice - 1, FALSE);
321 } else
322 choice = MIN(choice + 1, max_choice - 1);
323
324 } else if (key == KEY_PPAGE) {
325 scrollok(menu, TRUE);
326 for (i = 0; (i < max_choice); i++) {
327 if (scroll > 0) {
328 do_scroll(menu, &scroll, -1);
329 print_item(scroll, 0, FALSE);
330 } else {
331 if (choice > 0)
332 choice--;
333 }
334 }
335
336 } else if (key == KEY_NPAGE) {
337 for (i = 0; (i < max_choice); i++) {
338 if (scroll + max_choice < item_no) {
339 do_scroll(menu, &scroll, 1);
340 print_item(scroll+max_choice-1,
341 max_choice - 1, FALSE);
342 } else {
343 if (choice + 1 < max_choice)
344 choice++;
345 }
346 }
347 } else
348 choice = i;
349
350 print_item(scroll + choice, choice, TRUE);
351
352 print_arrows(dialog, item_no, scroll,
353 box_y, box_x + item_x + 1, menu_height);
354
355 wnoutrefresh(dialog);
356 wrefresh(menu);
357
358 continue; /* wait for another key press */
359 }
360
361 switch (key) {
362 case KEY_LEFT:
363 case TAB:
364 case KEY_RIGHT:
365 button = ((key == KEY_LEFT ? --button : ++button) < 0)
366 ? 2 : (button > 2 ? 0 : button);
367
368 print_buttons(dialog, height, width, button);
369 wrefresh(menu);
370 break;
371 case ' ':
372 case 's':
373 case 'y':
374 case 'n':
375 case 'm':
376 case '/':
377 /* save scroll info */
378 if ((f = fopen("lxdialog.scrltmp", "w")) != NULL) {
379 fprintf(f, "%d\n", scroll);
380 fclose(f);
381 }
382 delwin(dialog);
383 fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
384 switch (key) {
385 case 's':
386 return 3;
387 case 'y':
388 return 3;
389 case 'n':
390 return 4;
391 case 'm':
392 return 5;
393 case ' ':
394 return 6;
395 case '/':
396 return 7;
397 }
398 return 0;
399 case 'h':
400 case '?':
401 button = 2;
402 case '\n':
403 delwin(dialog);
404 if (button == 2)
405 fprintf(stderr, "%s \"%s\"\n",
406 items[(scroll + choice) * 2],
407 items[(scroll + choice) * 2 + 1] +
408 first_alpha(items [(scroll + choice) * 2 + 1], ""));
409 else
410 fprintf(stderr, "%s\n",
411 items[(scroll + choice) * 2]);
412
413 remove("lxdialog.scrltmp");
414 return button;
415 case 'e':
416 case 'x':
417 key = ESC;
418 case ESC:
419 break;
420 }
421 }
422
423 delwin(dialog);
424 remove("lxdialog.scrltmp");
425 return -1; /* ESC pressed */
426 }
427