source: menu/lxdialog/menubox.c@ c5ae20a

experimental
Last change on this file since c5ae20a was 613d46b, checked in by George Boudreau <georgeb@…>, 18 years ago

Added new configuration tool.. <make> menuconfig. Needs work, especially inline help text
  • Property mode set to 100644
File size: 11.6 KB
Line 
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
61static int menu_width, item_x;
62
63/*
64 * Print menu item
65 */
66static void
67print_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, "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 wrefresh (win);
97 }
98}
99
100/*
101 * Print the scroll indicators.
102 */
103static void
104print_arrows (WINDOW * win, int item_no, int scroll,
105 int y, int x, int height)
106{
107 int cur_y, cur_x;
108
109 getyx(win, cur_y, cur_x);
110
111 wmove(win, y, x);
112
113 if (scroll > 0) {
114 wattrset (win, uarrow_attr);
115 waddch (win, ACS_UARROW);
116 waddstr (win, "(-)");
117 }
118 else {
119 wattrset (win, menubox_attr);
120 waddch (win, ACS_HLINE);
121 waddch (win, ACS_HLINE);
122 waddch (win, ACS_HLINE);
123 waddch (win, ACS_HLINE);
124 }
125
126 y = y + height + 1;
127 wmove(win, y, x);
128
129 if ((height < item_no) && (scroll + height < item_no)) {
130 wattrset (win, darrow_attr);
131 waddch (win, ACS_DARROW);
132 waddstr (win, "(+)");
133 }
134 else {
135 wattrset (win, menubox_border_attr);
136 waddch (win, ACS_HLINE);
137 waddch (win, ACS_HLINE);
138 waddch (win, ACS_HLINE);
139 waddch (win, ACS_HLINE);
140 }
141
142 wmove(win, cur_y, cur_x);
143}
144
145/*
146 * Display the termination buttons.
147 */
148static void
149print_buttons (WINDOW *win, int height, int width, int selected)
150{
151 int x = width / 2 - 16;
152 int y = height - 2;
153
154 print_button (win, "Select", y, x, selected == 0);
155 print_button (win, " Exit ", y, x + 12, selected == 1);
156 print_button (win, " Help ", y, x + 24, selected == 2);
157
158 wmove(win, y, x+1+12*selected);
159 wrefresh (win);
160}
161
162/*
163 * Display a menu for choosing among a number of options
164 */
165int
166dialog_menu (const char *title, const char *prompt, int height, int width,
167 int menu_height, const char *current, int item_no,
168 struct dialog_list_item ** items)
169{
170 int i, j, x, y, box_x, box_y;
171 int key = 0, button = 0, scroll = 0, choice = 0, first_item = 0, max_choice;
172 WINDOW *dialog, *menu;
173 FILE *f;
174
175 max_choice = MIN (menu_height, item_no);
176
177 /* center dialog box on screen */
178 x = (COLS - width) / 2;
179 y = (LINES - height) / 2;
180
181 draw_shadow (stdscr, y, x, height, width);
182
183 dialog = newwin (height, width, y, x);
184 keypad (dialog, TRUE);
185
186 draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);
187 wattrset (dialog, border_attr);
188 mvwaddch (dialog, height - 3, 0, ACS_LTEE);
189 for (i = 0; i < width - 2; i++)
190 waddch (dialog, ACS_HLINE);
191 wattrset (dialog, dialog_attr);
192 wbkgdset (dialog, dialog_attr & A_COLOR);
193 waddch (dialog, ACS_RTEE);
194
195 if (title != NULL && strlen(title) >= width-2 ) {
196 /* truncate long title -- mec */
197 char * title2 = malloc(width-2+1);
198 memcpy( title2, title, width-2 );
199 title2[width-2] = '\0';
200 title = title2;
201 }
202
203 if (title != NULL) {
204 wattrset (dialog, title_attr);
205 mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
206 waddstr (dialog, (char *)title);
207 waddch (dialog, ' ');
208 }
209
210 wattrset (dialog, dialog_attr);
211 print_autowrap (dialog, prompt, width - 2, 1, 3);
212
213 menu_width = width - 6;
214 box_y = height - menu_height - 5;
215 box_x = (width - menu_width) / 2 - 1;
216
217 /* create new window for the menu */
218 menu = subwin (dialog, menu_height, menu_width,
219 y + box_y + 1, x + box_x + 1);
220 keypad (menu, TRUE);
221
222 /* draw a box around the menu items */
223 draw_box (dialog, box_y, box_x, menu_height + 2, menu_width + 2,
224 menubox_border_attr, menubox_attr);
225
226 /*
227 * Find length of longest item in order to center menu.
228 * Set 'choice' to default item.
229 */
230 item_x = 0;
231 for (i = 0; i < item_no; i++) {
232 item_x = MAX (item_x, MIN(menu_width, strlen (items[i]->name) + 2));
233 if (strcmp(current, items[i]->tag) == 0) choice = i;
234 }
235
236 item_x = (menu_width - item_x) / 2;
237
238 /* get the scroll info from the temp file */
239 if ( (f=fopen("lxdialog.scrltmp","r")) != NULL ) {
240 if ( (fscanf(f,"%d\n",&scroll) == 1) && (scroll <= choice) &&
241 (scroll+max_choice > choice) && (scroll >= 0) &&
242 (scroll+max_choice <= item_no) ) {
243 first_item = scroll;
244 choice = choice - scroll;
245 fclose(f);
246 } else {
247 scroll=0;
248 remove("lxdialog.scrltmp");
249 fclose(f);
250 f=NULL;
251 }
252 }
253 if ( (choice >= max_choice) || (f==NULL && choice >= max_choice/2) ) {
254 if (choice >= item_no-max_choice/2)
255 scroll = first_item = item_no-max_choice;
256 else
257 scroll = first_item = choice - max_choice/2;
258 choice = choice - scroll;
259 }
260
261 /* Print the menu */
262 for (i=0; i < max_choice; i++) {
263 print_item (menu, items[first_item + i]->name, i, i == choice,
264 (items[first_item + i]->tag[0] != ':'));
265 }
266
267 wnoutrefresh (menu);
268
269 print_arrows(dialog, item_no, scroll,
270 box_y, box_x+item_x+1, menu_height);
271
272 print_buttons (dialog, height, width, 0);
273 wmove (menu, choice, item_x+1);
274 wrefresh (menu);
275
276 while (key != ESC) {
277 key = wgetch(menu);
278
279 if (key < 256 && isalpha(key)) key = tolower(key);
280
281 if (strchr("ynmh", key))
282 i = max_choice;
283 else {
284 for (i = choice+1; i < max_choice; i++) {
285 j = first_alpha(items[scroll + i]->name, "YyNnMmHh");
286 if (key == tolower(items[scroll + i]->name[j]))
287 break;
288 }
289 if (i == max_choice)
290 for (i = 0; i < max_choice; i++) {
291 j = first_alpha(items[scroll + i]->name, "YyNnMmHh");
292 if (key == tolower(items[scroll + i]->name[j]))
293 break;
294 }
295 }
296
297 if (i < max_choice ||
298 key == KEY_UP || key == KEY_DOWN ||
299 key == '-' || key == '+' ||
300 key == KEY_PPAGE || key == KEY_NPAGE) {
301
302 print_item (menu, items[scroll + choice]->name, choice, FALSE,
303 (items[scroll + choice]->tag[0] != ':'));
304
305 if (key == KEY_UP || key == '-') {
306 if (choice < 2 && scroll) {
307 /* Scroll menu down */
308 scrollok (menu, TRUE);
309 wscrl (menu, -1);
310 scrollok (menu, FALSE);
311
312 scroll--;
313
314 print_item (menu, items[scroll]->name, 0, FALSE,
315 (items[scroll]->tag[0] != ':'));
316 } else
317 choice = MAX(choice - 1, 0);
318
319 } else if (key == KEY_DOWN || key == '+') {
320
321 print_item (menu, items[scroll + choice]->name, choice, FALSE,
322 (items[scroll + choice]->tag[0] != ':'));
323
324 if ((choice > max_choice-3) &&
325 (scroll + max_choice < item_no)
326 ) {
327 /* Scroll menu up */
328 scrollok (menu, TRUE);
329 scroll (menu);
330 scrollok (menu, FALSE);
331
332 scroll++;
333
334 print_item (menu, items[scroll + max_choice - 1]->name,
335 max_choice-1, FALSE,
336 (items[scroll + max_choice - 1]->tag[0] != ':'));
337 } else
338 choice = MIN(choice+1, max_choice-1);
339
340 } else if (key == KEY_PPAGE) {
341 scrollok (menu, TRUE);
342 for (i=0; (i < max_choice); i++) {
343 if (scroll > 0) {
344 wscrl (menu, -1);
345 scroll--;
346 print_item (menu, items[scroll]->name, 0, FALSE,
347 (items[scroll]->tag[0] != ':'));
348 } else {
349 if (choice > 0)
350 choice--;
351 }
352 }
353 scrollok (menu, FALSE);
354
355 } else if (key == KEY_NPAGE) {
356 for (i=0; (i < max_choice); i++) {
357 if (scroll+max_choice < item_no) {
358 scrollok (menu, TRUE);
359 scroll(menu);
360 scrollok (menu, FALSE);
361 scroll++;
362 print_item (menu, items[scroll + max_choice - 1]->name,
363 max_choice-1, FALSE,
364 (items[scroll + max_choice - 1]->tag[0] != ':'));
365 } else {
366 if (choice+1 < max_choice)
367 choice++;
368 }
369 }
370
371 } else
372 choice = i;
373
374 print_item (menu, items[scroll + choice]->name, choice, TRUE,
375 (items[scroll + choice]->tag[0] != ':'));
376
377 print_arrows(dialog, item_no, scroll,
378 box_y, box_x+item_x+1, menu_height);
379
380 wnoutrefresh (dialog);
381 wrefresh (menu);
382
383 continue; /* wait for another key press */
384 }
385
386 switch (key) {
387 case KEY_LEFT:
388 case TAB:
389 case KEY_RIGHT:
390 button = ((key == KEY_LEFT ? --button : ++button) < 0)
391 ? 2 : (button > 2 ? 0 : button);
392
393 print_buttons(dialog, height, width, button);
394 wrefresh (menu);
395 break;
396 case ' ':
397 case 's':
398 case 'y':
399 case 'n':
400 case 'm':
401 case '/':
402 /* save scroll info */
403 if ( (f=fopen("lxdialog.scrltmp","w")) != NULL ) {
404 fprintf(f,"%d\n",scroll);
405 fclose(f);
406 }
407 delwin (dialog);
408 items[scroll + choice]->selected = 1;
409 switch (key) {
410 case 's': return 3;
411 case 'y': return 3;
412 case 'n': return 4;
413 case 'm': return 5;
414 case ' ': return 6;
415 case '/': return 7;
416 }
417 return 0;
418 case 'h':
419 case '?':
420 button = 2;
421 case '\n':
422 delwin (dialog);
423 items[scroll + choice]->selected = 1;
424
425 remove("lxdialog.scrltmp");
426 return button;
427 case 'e':
428 case 'x':
429 key = ESC;
430 case ESC:
431 break;
432 }
433 }
434
435 delwin (dialog);
436 remove("lxdialog.scrltmp");
437 return -1; /* ESC pressed */
438}
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