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 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) \
102do {\
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 */
110static 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 */
154static 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) */
168static 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 */
181int 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