1/*
2 *  checklist.c -- implements the checklist box
3 *
4 *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
5 *     Stuart Herbert - S.Herbert@sheffield.ac.uk: radiolist extension
6 *     Alessandro Rubini - rubini@ipvvis.unipv.it: merged the two
7 *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
8 *
9 *  This program is free software; you can redistribute it and/or
10 *  modify it under the terms of the GNU General Public License
11 *  as published by the Free Software Foundation; either version 2
12 *  of the License, or (at your option) any later version.
13 *
14 *  This program is distributed in the hope that it will be useful,
15 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 *  GNU General Public License for more details.
18 *
19 *  You should have received a copy of the GNU General Public License
20 *  along with this program; if not, write to the Free Software
21 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24#include "dialog.h"
25
26static int list_width, check_x, item_x, checkflag;
27
28/*
29 * Print list item
30 */
31static void
32print_item (WINDOW * win, const char *item, int status,
33	    int choice, int selected)
34{
35    int i;
36
37    /* Clear 'residue' of last item */
38    wattrset (win, menubox_attr);
39    wmove (win, choice, 0);
40    for (i = 0; i < list_width; i++)
41	waddch (win, ' ');
42
43    wmove (win, choice, check_x);
44    wattrset (win, selected ? check_selected_attr : check_attr);
45    if (checkflag == FLAG_CHECK)
46	wprintw (win, "[%c]", status ? 'X' : ' ');
47    else
48	wprintw (win, "(%c)", status ? 'X' : ' ');
49
50    wattrset (win, selected ? tag_selected_attr : tag_attr);
51    mvwaddch(win, choice, item_x, item[0]);
52    wattrset (win, selected ? item_selected_attr : item_attr);
53    waddstr (win, (char *)item+1);
54    if (selected) {
55    	wmove (win, choice, check_x+1);
56    	wrefresh (win);
57    }
58}
59
60/*
61 * Print the scroll indicators.
62 */
63static void
64print_arrows (WINDOW * win, int choice, int item_no, int scroll,
65		int y, int x, int height)
66{
67    wmove(win, y, x);
68
69    if (scroll > 0) {
70	wattrset (win, uarrow_attr);
71	waddch (win, ACS_UARROW);
72	waddstr (win, "(-)");
73    }
74    else {
75	wattrset (win, menubox_attr);
76	waddch (win, ACS_HLINE);
77	waddch (win, ACS_HLINE);
78	waddch (win, ACS_HLINE);
79	waddch (win, ACS_HLINE);
80    }
81
82   y = y + height + 1;
83   wmove(win, y, x);
84
85   if ((height < item_no) && (scroll + choice < item_no - 1)) {
86	wattrset (win, darrow_attr);
87	waddch (win, ACS_DARROW);
88	waddstr (win, "(+)");
89    }
90    else {
91	wattrset (win, menubox_border_attr);
92	waddch (win, ACS_HLINE);
93	waddch (win, ACS_HLINE);
94	waddch (win, ACS_HLINE);
95	waddch (win, ACS_HLINE);
96   }
97}
98
99/*
100 *  Display the termination buttons
101 */
102static void
103print_buttons( WINDOW *dialog, int height, int width, int selected)
104{
105    int x = width / 2 - 11;
106    int y = height - 2;
107
108    print_button (dialog, "Select", y, x, selected == 0);
109    print_button (dialog, " Help ", y, x + 14, selected == 1);
110
111    wmove(dialog, y, x+1 + 14*selected);
112    wrefresh (dialog);
113}
114
115/*
116 * Display a dialog box with a list of options that can be turned on or off
117 * The `flag' parameter is used to select between radiolist and checklist.
118 */
119int
120dialog_checklist (const char *title, const char *prompt, int height, int width,
121	int list_height, int item_no, struct dialog_list_item ** items,
122	int flag)
123
124{
125    int i, x, y, box_x, box_y;
126    int key = 0, button = 0, choice = 0, scroll = 0, max_choice, *status;
127    WINDOW *dialog, *list;
128
129    checkflag = flag;
130
131    /* Allocate space for storing item on/off status */
132    if ((status = malloc (sizeof (int) * item_no)) == NULL) {
133	endwin ();
134	fprintf (stderr,
135		 "\nCan't allocate memory in dialog_checklist().\n");
136	exit (-1);
137    }
138
139    /* Initializes status */
140    for (i = 0; i < item_no; i++) {
141	status[i] = items[i]->selected;
142	if (!choice && status[i])
143            choice = i;
144    }
145
146    max_choice = MIN (list_height, item_no);
147
148    /* center dialog box on screen */
149    x = (COLS - width) / 2;
150    y = (LINES - height) / 2;
151
152    draw_shadow (stdscr, y, x, height, width);
153
154    dialog = newwin (height, width, y, x);
155    keypad (dialog, TRUE);
156
157    draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);
158    wattrset (dialog, border_attr);
159    mvwaddch (dialog, height-3, 0, ACS_LTEE);
160    for (i = 0; i < width - 2; i++)
161	waddch (dialog, ACS_HLINE);
162    wattrset (dialog, dialog_attr);
163    waddch (dialog, ACS_RTEE);
164
165    if (title != NULL && strlen(title) >= width-2 ) {
166	/* truncate long title -- mec */
167	char * title2 = malloc(width-2+1);
168	memcpy( title2, title, width-2 );
169	title2[width-2] = '\0';
170	title = title2;
171    }
172
173    if (title != NULL) {
174	wattrset (dialog, title_attr);
175	mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
176	waddstr (dialog, (char *)title);
177	waddch (dialog, ' ');
178    }
179
180    wattrset (dialog, dialog_attr);
181    print_autowrap (dialog, prompt, width - 2, 1, 3);
182
183    list_width = width - 6;
184    box_y = height - list_height - 5;
185    box_x = (width - list_width) / 2 - 1;
186
187    /* create new window for the list */
188    list = subwin (dialog, list_height, list_width, y+box_y+1, x+box_x+1);
189
190    keypad (list, TRUE);
191
192    /* draw a box around the list items */
193    draw_box (dialog, box_y, box_x, list_height + 2, list_width + 2,
194	      menubox_border_attr, menubox_attr);
195
196    /* Find length of longest item in order to center checklist */
197    check_x = 0;
198    for (i = 0; i < item_no; i++)
199	check_x = MAX (check_x, + strlen (items[i]->name) + 4);
200
201    check_x = (list_width - check_x) / 2;
202    item_x = check_x + 4;
203
204    if (choice >= list_height) {
205	scroll = choice - list_height + 1;
206	choice -= scroll;
207    }
208
209    /* Print the list */
210    for (i = 0; i < max_choice; i++) {
211	print_item (list, items[scroll + i]->name,
212		    status[i+scroll], i, i == choice);
213    }
214
215    print_arrows(dialog, choice, item_no, scroll,
216			box_y, box_x + check_x + 5, list_height);
217
218    print_buttons(dialog, height, width, 0);
219
220    wnoutrefresh (list);
221    wnoutrefresh (dialog);
222    doupdate ();
223
224    while (key != ESC) {
225	key = wgetch (dialog);
226
227    	for (i = 0; i < max_choice; i++)
228            if (toupper(key) == toupper(items[scroll + i]->name[0]))
229                break;
230
231
232	if ( i < max_choice || key == KEY_UP || key == KEY_DOWN ||
233	    key == '+' || key == '-' ) {
234	    if (key == KEY_UP || key == '-') {
235		if (!choice) {
236		    if (!scroll)
237			continue;
238		    /* Scroll list down */
239		    if (list_height > 1) {
240			/* De-highlight current first item */
241			print_item (list, items[scroll]->name,
242					status[scroll], 0, FALSE);
243			scrollok (list, TRUE);
244			wscrl (list, -1);
245			scrollok (list, FALSE);
246		    }
247		    scroll--;
248		    print_item (list, items[scroll]->name,
249				status[scroll], 0, TRUE);
250		    wnoutrefresh (list);
251
252    		    print_arrows(dialog, choice, item_no, scroll,
253				box_y, box_x + check_x + 5, list_height);
254
255		    wrefresh (dialog);
256
257		    continue;	/* wait for another key press */
258		} else
259		    i = choice - 1;
260	    } else if (key == KEY_DOWN || key == '+') {
261		if (choice == max_choice - 1) {
262		    if (scroll + choice >= item_no - 1)
263			continue;
264		    /* Scroll list up */
265		    if (list_height > 1) {
266			/* De-highlight current last item before scrolling up */
267			print_item (list, items[scroll + max_choice - 1]->name,
268				    status[scroll + max_choice - 1],
269				    max_choice - 1, FALSE);
270			scrollok (list, TRUE);
271			scroll (list);
272			scrollok (list, FALSE);
273		    }
274		    scroll++;
275		    print_item (list, items[scroll + max_choice - 1]->name,
276				status[scroll + max_choice - 1],
277				max_choice - 1, TRUE);
278		    wnoutrefresh (list);
279
280    		    print_arrows(dialog, choice, item_no, scroll,
281				box_y, box_x + check_x + 5, list_height);
282
283		    wrefresh (dialog);
284
285		    continue;	/* wait for another key press */
286		} else
287		    i = choice + 1;
288	    }
289	    if (i != choice) {
290		/* De-highlight current item */
291		print_item (list, items[scroll + choice]->name,
292			    status[scroll + choice], choice, FALSE);
293		/* Highlight new item */
294		choice = i;
295		print_item (list, items[scroll + choice]->name,
296			    status[scroll + choice], choice, TRUE);
297		wnoutrefresh (list);
298		wrefresh (dialog);
299	    }
300	    continue;		/* wait for another key press */
301	}
302	switch (key) {
303	case 'H':
304	case 'h':
305	case '?':
306	    delwin (dialog);
307	    free (status);
308	    return 1;
309	case TAB:
310	case KEY_LEFT:
311	case KEY_RIGHT:
312	    button = ((key == KEY_LEFT ? --button : ++button) < 0)
313			? 1 : (button > 1 ? 0 : button);
314
315	    print_buttons(dialog, height, width, button);
316	    wrefresh (dialog);
317	    break;
318	case 'S':
319	case 's':
320	case ' ':
321	case '\n':
322	    if (!button) {
323		if (flag == FLAG_CHECK) {
324		    status[scroll + choice] = !status[scroll + choice];
325		    wmove (list, choice, check_x);
326		    wattrset (list, check_selected_attr);
327		    wprintw (list, "[%c]", status[scroll + choice] ? 'X' : ' ');
328		} else {
329		    if (!status[scroll + choice]) {
330			for (i = 0; i < item_no; i++)
331			    status[i] = 0;
332			status[scroll + choice] = 1;
333			for (i = 0; i < max_choice; i++)
334			    print_item (list, items[scroll + i]->name,
335					status[scroll + i], i, i == choice);
336		    }
337		}
338		wnoutrefresh (list);
339		wrefresh (dialog);
340
341		for (i = 0; i < item_no; i++) {
342			items[i]->selected = status[i];
343		}
344            }
345	    delwin (dialog);
346	    free (status);
347	    return button;
348	case 'X':
349	case 'x':
350	    key = ESC;
351	case ESC:
352	    break;
353	}
354
355	/* Now, update everything... */
356	doupdate ();
357    }
358
359
360    delwin (dialog);
361    free (status);
362    return -1;			/* ESC pressed */
363}
364