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
67 print_item (WINDOW * win, const char *item, int choice, int selected, int hotkey)
68 {
69 int j;
70 char menu_item[menu_width+1];
71
72 strncpy(menu_item, item, menu_width);
73 menu_item[menu_width] = 0;
74 j = first_alpha(menu_item, "YyNnMm");
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 }
95
96 /*
97 * Print the scroll indicators.
98 */
99 static void
100 print_arrows (WINDOW * win, int item_no, int scroll,
101 int y, int x, int height)
102 {
103 int cur_y, cur_x;
104
105 getyx(win, cur_y, cur_x);
106
107 wmove(win, y, x);
108
109 if (scroll > 0) {
110 wattrset (win, uarrow_attr);
111 waddch (win, ACS_UARROW);
112 waddstr (win, "(-)");
113 }
114 else {
115 wattrset (win, menubox_attr);
116 waddch (win, ACS_HLINE);
117 waddch (win, ACS_HLINE);
118 waddch (win, ACS_HLINE);
119 waddch (win, ACS_HLINE);
120 }
121
122 y = y + height + 1;
123 wmove(win, y, x);
124
125 if ((height < item_no) && (scroll + height < item_no)) {
126 wattrset (win, darrow_attr);
127 waddch (win, ACS_DARROW);
128 waddstr (win, "(+)");
129 }
130 else {
131 wattrset (win, menubox_border_attr);
132 waddch (win, ACS_HLINE);
133 waddch (win, ACS_HLINE);
134 waddch (win, ACS_HLINE);
135 waddch (win, ACS_HLINE);
136 }
137
138 wmove(win, cur_y, cur_x);
139 }
140
141 /*
142 * Display the termination buttons.
143 */
144 static void
145 print_buttons (WINDOW *win, int height, int width, int selected)
146 {
147 int x = width / 2 - 16;
148 int y = height - 2;
149
150 print_button (win, "Select", y, x, selected == 0);
151 print_button (win, " Exit ", y, x + 12, selected == 1);
152 print_button (win, " Help ", y, x + 24, selected == 2);
153
154 wmove(win, y, x+1+12*selected);
155 wrefresh (win);
156 }
157
158 /*
159 * Display a menu for choosing among a number of options
160 */
161 int
162 dialog_menu (const char *title, const char *prompt, int height, int width,
163 int menu_height, const char *current, int item_no,
164 const char * const * items)
165
166 {
167 int i, j, x, y, box_x, box_y;
168 int key = 0, button = 0, scroll = 0, choice = 0, first_item = 0, max_choice;
169 WINDOW *dialog, *menu;
170 FILE *f;
171
172 max_choice = MIN (menu_height, item_no);
173
174 /* center dialog box on screen */
175 x = (COLS - width) / 2;
176 y = (LINES - height) / 2;
177
178 draw_shadow (stdscr, y, x, height, width);
179
180 dialog = newwin (height, width, y, x);
181 keypad (dialog, TRUE);
182
183 draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);
184 wattrset (dialog, border_attr);
185 mvwaddch (dialog, height - 3, 0, ACS_LTEE);
186 for (i = 0; i < width - 2; i++)
187 waddch (dialog, ACS_HLINE);
188 wattrset (dialog, dialog_attr);
189 wbkgdset (dialog, dialog_attr & A_COLOR);
190 waddch (dialog, ACS_RTEE);
191
192 if (title != NULL && strlen(title) >= width-2 ) {
193 /* truncate long title -- mec */
194 char * title2 = malloc(width-2+1);
195 memcpy( title2, title, width-2 );
196 title2[width-2] = '\0';
197 title = title2;
198 }
199
200 if (title != NULL) {
201 wattrset (dialog, title_attr);
202 mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
203 waddstr (dialog, (char *)title);
204 waddch (dialog, ' ');
205 }
206
207 wattrset (dialog, dialog_attr);
208 print_autowrap (dialog, prompt, width - 2, 1, 3);
209
210 menu_width = width - 6;
211 box_y = height - menu_height - 5;
212 box_x = (width - menu_width) / 2 - 1;
213
214 /* create new window for the menu */
215 menu = subwin (dialog, menu_height, menu_width,
216 y + box_y + 1, x + box_x + 1);
217 keypad (menu, TRUE);
218
219 /* draw a box around the menu items */
220 draw_box (dialog, box_y, box_x, menu_height + 2, menu_width + 2,
221 menubox_border_attr, menubox_attr);
222
223 /*
224 * Find length of longest item in order to center menu.
225 * Set 'choice' to default item.
226 */
227 item_x = 0;
228 for (i = 0; i < item_no; i++) {
229 item_x = MAX (item_x, MIN(menu_width, strlen (items[i * 2 + 1]) + 2));
230 if (strcmp(current, items[i*2]) == 0) choice = i;
231 }
232
233 item_x = (menu_width - item_x) / 2;
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 (menu, items[(first_item + i) * 2 + 1], i, i == choice,
261 (items[(first_item + i)*2][0] != ':'));
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
271 while (key != ESC) {
272 key = wgetch(dialog);
273
274 if (key < 256 && isalpha(key)) key = tolower(key);
275
276 if (strchr("ynm", key))
277 i = max_choice;
278 else {
279 for (i = choice+1; i < max_choice; i++) {
280 j = first_alpha(items[(scroll+i)*2+1], "YyNnMm");
281 if (key == tolower(items[(scroll+i)*2+1][j]))
282 break;
283 }
284 if (i == max_choice)
285 for (i = 0; i < max_choice; i++) {
286 j = first_alpha(items[(scroll+i)*2+1], "YyNnMm");
287 if (key == tolower(items[(scroll+i)*2+1][j]))
288 break;
289 }
290 }
291
292 if (i < max_choice ||
293 key == KEY_UP || key == KEY_DOWN ||
294 key == '-' || key == '+' ||
295 key == KEY_PPAGE || key == KEY_NPAGE) {
296
297 print_item (menu, items[(scroll+choice)*2+1], choice, FALSE,
298 (items[(scroll+choice)*2][0] != ':'));
299
300 if (key == KEY_UP || key == '-') {
301 if (choice < 2 && scroll) {
302 /* Scroll menu down */
303 scrollok (menu, TRUE);
304 wscrl (menu, -1);
305 scrollok (menu, FALSE);
306
307 scroll--;
308
309 print_item (menu, items[scroll * 2 + 1], 0, FALSE,
310 (items[scroll*2][0] != ':'));
311 } else
312 choice = MAX(choice - 1, 0);
313
314 } else if (key == KEY_DOWN || key == '+') {
315
316 print_item (menu, items[(scroll+choice)*2+1], choice, FALSE,
317 (items[(scroll+choice)*2][0] != ':'));
318
319 if ((choice > max_choice-3) &&
320 (scroll + max_choice < item_no)
321 ) {
322 /* Scroll menu up */
323 scrollok (menu, TRUE);
324 scroll (menu);
325 scrollok (menu, FALSE);
326
327 scroll++;
328
329 print_item (menu, items[(scroll+max_choice-1)*2+1],
330 max_choice-1, FALSE,
331 (items[(scroll+max_choice-1)*2][0] != ':'));
332 } else
333 choice = MIN(choice+1, max_choice-1);
334
335 } else if (key == KEY_PPAGE) {
336 scrollok (menu, TRUE);
337 for (i=0; (i < max_choice); i++) {
338 if (scroll > 0) {
339 wscrl (menu, -1);
340 scroll--;
341 print_item (menu, items[scroll * 2 + 1], 0, FALSE,
342 (items[scroll*2][0] != ':'));
343 } else {
344 if (choice > 0)
345 choice--;
346 }
347 }
348 scrollok (menu, FALSE);
349
350 } else if (key == KEY_NPAGE) {
351 for (i=0; (i < max_choice); i++) {
352 if (scroll+max_choice < item_no) {
353 scrollok (menu, TRUE);
354 scroll(menu);
355 scrollok (menu, FALSE);
356 scroll++;
357 print_item (menu, items[(scroll+max_choice-1)*2+1],
358 max_choice-1, FALSE,
359 (items[(scroll+max_choice-1)*2][0] != ':'));
360 } else {
361 if (choice+1 < max_choice)
362 choice++;
363 }
364 }
365
366 } else
367 choice = i;
368
369 print_item (menu, items[(scroll+choice)*2+1], choice, TRUE,
370 (items[(scroll+choice)*2][0] != ':'));
371
372 print_arrows(dialog, item_no, scroll,
373 box_y, box_x+item_x+1, menu_height);
374
375 wnoutrefresh (menu);
376 wrefresh (dialog);
377
378 continue; /* wait for another key press */
379 }
380
381 switch (key) {
382 case KEY_LEFT:
383 case TAB:
384 case KEY_RIGHT:
385 button = ((key == KEY_LEFT ? --button : ++button) < 0)
386 ? 2 : (button > 2 ? 0 : button);
387
388 print_buttons(dialog, height, width, button);
389 wrefresh (dialog);
390 break;
391 case ' ':
392 case 's':
393 case 'y':
394 case 'n':
395 case 'm':
396 /* save scroll info */
397 if ( (f=fopen("lxdialog.scrltmp","w")) != NULL ) {
398 fprintf(f,"%d\n",scroll);
399 fclose(f);
400 }
401 delwin (dialog);
402 fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
403 switch (key) {
404 case 's': return 3;
405 case 'y': return 3;
406 case 'n': return 4;
407 case 'm': return 5;
408 case ' ': return 6;
409 }
410 return 0;
411 case 'h':
412 case '?':
413 button = 2;
414 case '\n':
415 delwin (dialog);
416 if (button == 2)
417 fprintf(stderr, "%s \"%s\"\n",
418 items[(scroll + choice) * 2],
419 items[(scroll + choice) * 2 + 1] +
420 first_alpha(items[(scroll + choice) * 2 + 1],""));
421 else
422 fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
423
424 remove("lxdialog.scrltmp");
425 return button;
426 case 'e':
427 case 'x':
428 key = ESC;
429 case ESC:
430 break;
431 }
432 }
433
434 delwin (dialog);
435 remove("lxdialog.scrltmp");
436 return -1; /* ESC pressed */
437 }
438
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