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 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)				\
103do {									\
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 */
111static 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 */
155static void print_buttons(WINDOW * win, int height, int width, int selected)
156{
157	int x = width / 2 - 16;
158	int y = height - 2;
159
160	print_button(win, "Select", y, x, selected == 0);
161	print_button(win, " Exit ", y, x + 12, selected == 1);
162	print_button(win, " Help ", y, x + 24, selected == 2);
163
164	wmove(win, y, x + 1 + 12 * selected);
165	wrefresh(win);
166}
167
168/* scroll up n lines (n may be negative) */
169static void do_scroll(WINDOW *win, int *scroll, int n)
170{
171	/* Scroll menu up */
172	scrollok(win, TRUE);
173	wscrl(win, n);
174	scrollok(win, FALSE);
175	*scroll = *scroll + n;
176	wrefresh(win);
177}
178
179/*
180 * Display a menu for choosing among a number of options
181 */
182int dialog_menu(const char *title, const char *prompt,
183                const void *selected, int *s_scroll)
184{
185	int i, j, x, y, box_x, box_y;
186	int height, width, menu_height;
187	int key = 0, button = 0, scroll = 0, choice = 0;
188	int first_item =  0, max_choice;
189	WINDOW *dialog, *menu;
190
191do_resize:
192	height = getmaxy(stdscr);
193	width = getmaxx(stdscr);
194	if (height < 15 || width < 65)
195		return -ERRDISPLAYTOOSMALL;
196
197	height -= 4;
198	width  -= 5;
199	menu_height = height - 10;
200
201	max_choice = MIN(menu_height, item_count());
202
203	/* center dialog box on screen */
204	x = (COLS - width) / 2;
205	y = (LINES - height) / 2;
206
207	draw_shadow(stdscr, y, x, height, width);
208
209	dialog = newwin(height, width, y, x);
210	keypad(dialog, TRUE);
211
212	draw_box(dialog, 0, 0, height, width,
213		 dlg.dialog.atr, dlg.border.atr);
214	wattrset(dialog, dlg.border.atr);
215	mvwaddch(dialog, height - 3, 0, ACS_LTEE);
216	for (i = 0; i < width - 2; i++)
217		waddch(dialog, ACS_HLINE);
218	wattrset(dialog, dlg.dialog.atr);
219	wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
220	waddch(dialog, ACS_RTEE);
221
222	print_title(dialog, title, width);
223
224	wattrset(dialog, dlg.dialog.atr);
225	print_autowrap(dialog, prompt, width - 2, 1, 3);
226
227	menu_width = width - 6;
228	box_y = height - menu_height - 5;
229	box_x = (width - menu_width) / 2 - 1;
230
231	/* create new window for the menu */
232	menu = subwin(dialog, menu_height, menu_width,
233		      y + box_y + 1, x + box_x + 1);
234	keypad(menu, TRUE);
235
236	/* draw a box around the menu items */
237	draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
238		 dlg.menubox_border.atr, dlg.menubox.atr);
239
240	if (menu_width >= 80)
241		item_x = (menu_width - 70) / 2;
242	else
243		item_x = 4;
244
245	/* Set choice to default item */
246	item_foreach()
247		if (selected && (selected == item_data()))
248			choice = item_n();
249	/* get the saved scroll info */
250	scroll = *s_scroll;
251	if ((scroll <= choice) && (scroll + max_choice > choice) &&
252	   (scroll >= 0) && (scroll + max_choice <= item_count())) {
253		first_item = scroll;
254		choice = choice - scroll;
255	} else {
256		scroll = 0;
257	}
258	if ((choice >= max_choice)) {
259		if (choice >= item_count() - max_choice / 2)
260			scroll = first_item = item_count() - max_choice;
261		else
262			scroll = first_item = choice - max_choice / 2;
263		choice = choice - scroll;
264	}
265
266	/* Print the menu */
267	for (i = 0; i < max_choice; i++) {
268		print_item(first_item + i, i, i == choice);
269	}
270
271	wnoutrefresh(menu);
272
273	print_arrows(dialog, item_count(), scroll,
274		     box_y, box_x + item_x + 1, menu_height);
275
276	print_buttons(dialog, height, width, 0);
277	wmove(menu, choice, item_x + 1);
278	wrefresh(menu);
279
280	while (key != KEY_ESC) {
281		key = wgetch(menu);
282
283		if (key < 256 && isalpha(key))
284			key = tolower(key);
285
286		if (strchr("ynmh", key))
287			i = max_choice;
288		else {
289			for (i = choice + 1; i < max_choice; i++) {
290				item_set(scroll + i);
291				j = first_alpha(item_str(), "YyNnMmHh");
292				if (key == tolower(item_str()[j]))
293					break;
294			}
295			if (i == max_choice)
296				for (i = 0; i < max_choice; i++) {
297					item_set(scroll + i);
298					j = first_alpha(item_str(), "YyNnMmHh");
299					if (key == tolower(item_str()[j]))
300						break;
301				}
302		}
303
304		if (i < max_choice ||
305		    key == KEY_UP || key == KEY_DOWN ||
306		    key == '-' || key == '+' ||
307		    key == KEY_PPAGE || key == KEY_NPAGE) {
308			/* Remove highligt of current item */
309			print_item(scroll + choice, choice, FALSE);
310
311			if (key == KEY_UP || key == '-') {
312				if (choice < 2 && scroll) {
313					/* Scroll menu down */
314					do_scroll(menu, &scroll, -1);
315
316					print_item(scroll, 0, FALSE);
317				} else
318					choice = MAX(choice - 1, 0);
319
320			} else if (key == KEY_DOWN || key == '+') {
321				print_item(scroll+choice, choice, FALSE);
322
323				if ((choice > max_choice - 3) &&
324				    (scroll + max_choice < item_count())) {
325					/* Scroll menu up */
326					do_scroll(menu, &scroll, 1);
327
328					print_item(scroll+max_choice - 1,
329						   max_choice - 1, FALSE);
330				} else
331					choice = MIN(choice + 1, max_choice - 1);
332
333			} else if (key == KEY_PPAGE) {
334				scrollok(menu, TRUE);
335				for (i = 0; (i < max_choice); i++) {
336					if (scroll > 0) {
337						do_scroll(menu, &scroll, -1);
338						print_item(scroll, 0, FALSE);
339					} else {
340						if (choice > 0)
341							choice--;
342					}
343				}
344
345			} else if (key == KEY_NPAGE) {
346				for (i = 0; (i < max_choice); i++) {
347					if (scroll + max_choice < item_count()) {
348						do_scroll(menu, &scroll, 1);
349						print_item(scroll+max_choice-1,
350							   max_choice - 1, FALSE);
351					} else {
352						if (choice + 1 < max_choice)
353							choice++;
354					}
355				}
356			} else
357				choice = i;
358
359			print_item(scroll + choice, choice, TRUE);
360
361			print_arrows(dialog, item_count(), scroll,
362				     box_y, box_x + item_x + 1, menu_height);
363
364			wnoutrefresh(dialog);
365			wrefresh(menu);
366
367			continue;	/* wait for another key press */
368		}
369
370		switch (key) {
371		case KEY_LEFT:
372		case TAB:
373		case KEY_RIGHT:
374			button = ((key == KEY_LEFT ? --button : ++button) < 0)
375			    ? 2 : (button > 2 ? 0 : button);
376
377			print_buttons(dialog, height, width, button);
378			wrefresh(menu);
379			break;
380		case ' ':
381		case 's':
382		case 'y':
383		case 'n':
384		case 'm':
385		case '/':
386			/* save scroll info */
387			*s_scroll = scroll;
388			delwin(menu);
389			delwin(dialog);
390			item_set(scroll + choice);
391			item_set_selected(1);
392			switch (key) {
393			case 's':
394				return 3;
395			case 'y':
396				return 3;
397			case 'n':
398				return 4;
399			case 'm':
400				return 5;
401			case ' ':
402				return 6;
403			case '/':
404				return 7;
405			}
406			return 0;
407		case 'h':
408		case '?':
409			button = 2;
410		case '\n':
411			*s_scroll = scroll;
412			delwin(menu);
413			delwin(dialog);
414			item_set(scroll + choice);
415			item_set_selected(1);
416			return button;
417		case 'e':
418		case 'x':
419			key = KEY_ESC;
420			break;
421		case KEY_ESC:
422			key = on_key_esc(menu);
423			break;
424		case KEY_RESIZE:
425			on_key_resize();
426			delwin(menu);
427			delwin(dialog);
428			goto do_resize;
429		}
430	}
431	delwin(menu);
432	delwin(dialog);
433	return key;		/* ESC pressed */
434}
435