Root/scripts/config/lxdialog/checklist.c

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;
27
28/*
29 * Print list item
30 */
31static void print_item(WINDOW * win, const char *item, int status, int choice,
32               int selected)
33{
34    int i;
35
36    /* Clear 'residue' of last item */
37    wattrset(win, menubox_attr);
38    wmove(win, choice, 0);
39    for (i = 0; i < list_width; i++)
40        waddch(win, ' ');
41
42    wmove(win, choice, check_x);
43    wattrset(win, selected ? check_selected_attr : check_attr);
44    wprintw(win, "(%c)", status ? 'X' : ' ');
45
46    wattrset(win, selected ? tag_selected_attr : tag_attr);
47    mvwaddch(win, choice, item_x, item[0]);
48    wattrset(win, selected ? item_selected_attr : item_attr);
49    waddstr(win, (char *)item + 1);
50    if (selected) {
51        wmove(win, choice, check_x + 1);
52        wrefresh(win);
53    }
54}
55
56/*
57 * Print the scroll indicators.
58 */
59static void print_arrows(WINDOW * win, int choice, int item_no, int scroll,
60         int y, int x, int height)
61{
62    wmove(win, y, x);
63
64    if (scroll > 0) {
65        wattrset(win, uarrow_attr);
66        waddch(win, ACS_UARROW);
67        waddstr(win, "(-)");
68    } else {
69        wattrset(win, menubox_attr);
70        waddch(win, ACS_HLINE);
71        waddch(win, ACS_HLINE);
72        waddch(win, ACS_HLINE);
73        waddch(win, ACS_HLINE);
74    }
75
76    y = y + height + 1;
77    wmove(win, y, x);
78
79    if ((height < item_no) && (scroll + choice < item_no - 1)) {
80        wattrset(win, darrow_attr);
81        waddch(win, ACS_DARROW);
82        waddstr(win, "(+)");
83    } else {
84        wattrset(win, menubox_border_attr);
85        waddch(win, ACS_HLINE);
86        waddch(win, ACS_HLINE);
87        waddch(win, ACS_HLINE);
88        waddch(win, ACS_HLINE);
89    }
90}
91
92/*
93 * Display the termination buttons
94 */
95static void print_buttons(WINDOW * dialog, int height, int width, int selected)
96{
97    int x = width / 2 - 11;
98    int y = height - 2;
99
100    print_button(dialog, "Select", y, x, selected == 0);
101    print_button(dialog, " Help ", y, x + 14, selected == 1);
102
103    wmove(dialog, y, x + 1 + 14 * selected);
104    wrefresh(dialog);
105}
106
107/*
108 * Display a dialog box with a list of options that can be turned on or off
109 * in the style of radiolist (only one option turned on at a time).
110 */
111int dialog_checklist(const char *title, const char *prompt, int height,
112             int width, int list_height, int item_no,
113             const char *const *items)
114{
115    int i, x, y, box_x, box_y;
116    int key = 0, button = 0, choice = 0, scroll = 0, max_choice, *status;
117    WINDOW *dialog, *list;
118
119    /* Allocate space for storing item on/off status */
120    if ((status = malloc(sizeof(int) * item_no)) == NULL) {
121        endwin();
122        fprintf(stderr,
123            "\nCan't allocate memory in dialog_checklist().\n");
124        exit(-1);
125    }
126
127    /* Initializes status */
128    for (i = 0; i < item_no; i++) {
129        status[i] = !strcasecmp(items[i * 3 + 2], "on");
130        if ((!choice && status[i])
131            || !strcasecmp(items[i * 3 + 2], "selected"))
132            choice = i + 1;
133    }
134    if (choice)
135        choice--;
136
137    max_choice = MIN(list_height, item_no);
138
139    /* center dialog box on screen */
140    x = (COLS - width) / 2;
141    y = (LINES - height) / 2;
142
143    draw_shadow(stdscr, y, x, height, width);
144
145    dialog = newwin(height, width, y, x);
146    keypad(dialog, TRUE);
147
148    draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
149    wattrset(dialog, border_attr);
150    mvwaddch(dialog, height - 3, 0, ACS_LTEE);
151    for (i = 0; i < width - 2; i++)
152        waddch(dialog, ACS_HLINE);
153    wattrset(dialog, dialog_attr);
154    waddch(dialog, ACS_RTEE);
155
156    print_title(dialog, title, width);
157
158    wattrset(dialog, dialog_attr);
159    print_autowrap(dialog, prompt, width - 2, 1, 3);
160
161    list_width = width - 6;
162    box_y = height - list_height - 5;
163    box_x = (width - list_width) / 2 - 1;
164
165    /* create new window for the list */
166    list = subwin(dialog, list_height, list_width, y + box_y + 1,
167                  x + box_x + 1);
168
169    keypad(list, TRUE);
170
171    /* draw a box around the list items */
172    draw_box(dialog, box_y, box_x, list_height + 2, list_width + 2,
173             menubox_border_attr, menubox_attr);
174
175    /* Find length of longest item in order to center checklist */
176    check_x = 0;
177    for (i = 0; i < item_no; i++)
178        check_x = MAX(check_x, +strlen(items[i * 3 + 1]) + 4);
179
180    check_x = (list_width - check_x) / 2;
181    item_x = check_x + 4;
182
183    if (choice >= list_height) {
184        scroll = choice - list_height + 1;
185        choice -= scroll;
186    }
187
188    /* Print the list */
189    for (i = 0; i < max_choice; i++) {
190        print_item(list, items[(scroll + i) * 3 + 1],
191               status[i + scroll], i, i == choice);
192    }
193
194    print_arrows(dialog, choice, item_no, scroll,
195             box_y, box_x + check_x + 5, list_height);
196
197    print_buttons(dialog, height, width, 0);
198
199    wnoutrefresh(list);
200    wnoutrefresh(dialog);
201    doupdate();
202
203    while (key != ESC) {
204        key = wgetch(dialog);
205
206        for (i = 0; i < max_choice; i++)
207            if (toupper(key) ==
208                toupper(items[(scroll + i) * 3 + 1][0]))
209                break;
210
211        if (i < max_choice || key == KEY_UP || key == KEY_DOWN ||
212            key == '+' || key == '-') {
213            if (key == KEY_UP || key == '-') {
214                if (!choice) {
215                    if (!scroll)
216                        continue;
217                    /* Scroll list down */
218                    if (list_height > 1) {
219                        /* De-highlight current first item */
220                        print_item(list, items[scroll * 3 + 1],
221                               status[scroll], 0, FALSE);
222                        scrollok(list, TRUE);
223                        wscrl(list, -1);
224                        scrollok(list, FALSE);
225                    }
226                    scroll--;
227                    print_item(list, items[scroll * 3 + 1], status[scroll], 0, TRUE);
228                    wnoutrefresh(list);
229
230                    print_arrows(dialog, choice, item_no,
231                             scroll, box_y, box_x + check_x + 5, list_height);
232
233                    wrefresh(dialog);
234
235                    continue; /* wait for another key press */
236                } else
237                    i = choice - 1;
238            } else if (key == KEY_DOWN || key == '+') {
239                if (choice == max_choice - 1) {
240                    if (scroll + choice >= item_no - 1)
241                        continue;
242                    /* Scroll list up */
243                    if (list_height > 1) {
244                        /* De-highlight current last item before scrolling up */
245                        print_item(list, items[(scroll + max_choice - 1) * 3 + 1],
246                               status[scroll + max_choice - 1],
247                               max_choice - 1, FALSE);
248                        scrollok(list, TRUE);
249                        wscrl(list, 1);
250                        scrollok(list, FALSE);
251                    }
252                    scroll++;
253                    print_item(list, items[(scroll + max_choice - 1) * 3 + 1],
254                           status[scroll + max_choice - 1], max_choice - 1, TRUE);
255                    wnoutrefresh(list);
256
257                    print_arrows(dialog, choice, item_no,
258                             scroll, box_y, box_x + check_x + 5, list_height);
259
260                    wrefresh(dialog);
261
262                    continue; /* wait for another key press */
263                } else
264                    i = choice + 1;
265            }
266            if (i != choice) {
267                /* De-highlight current item */
268                print_item(list, items[(scroll + choice) * 3 + 1],
269                       status[scroll + choice], choice, FALSE);
270                /* Highlight new item */
271                choice = i;
272                print_item(list, items[(scroll + choice) * 3 + 1],
273                       status[scroll + choice], choice, TRUE);
274                wnoutrefresh(list);
275                wrefresh(dialog);
276            }
277            continue; /* wait for another key press */
278        }
279        switch (key) {
280        case 'H':
281        case 'h':
282        case '?':
283            fprintf(stderr, "%s", items[(scroll + choice) * 3]);
284            delwin(dialog);
285            free(status);
286            return 1;
287        case TAB:
288        case KEY_LEFT:
289        case KEY_RIGHT:
290            button = ((key == KEY_LEFT ? --button : ++button) < 0)
291                ? 1 : (button > 1 ? 0 : button);
292
293            print_buttons(dialog, height, width, button);
294            wrefresh(dialog);
295            break;
296        case 'S':
297        case 's':
298        case ' ':
299        case '\n':
300            if (!button) {
301                if (!status[scroll + choice]) {
302                    for (i = 0; i < item_no; i++)
303                        status[i] = 0;
304                    status[scroll + choice] = 1;
305                    for (i = 0; i < max_choice; i++)
306                        print_item(list, items[(scroll + i) * 3 + 1],
307                               status[scroll + i], i, i == choice);
308                }
309                wnoutrefresh(list);
310                wrefresh(dialog);
311
312                for (i = 0; i < item_no; i++)
313                    if (status[i])
314                        fprintf(stderr, "%s", items[i * 3]);
315            } else
316                fprintf(stderr, "%s", items[(scroll + choice) * 3]);
317            delwin(dialog);
318            free(status);
319            return button;
320        case 'X':
321        case 'x':
322            key = ESC;
323        case ESC:
324            break;
325        }
326
327        /* Now, update everything... */
328        doupdate();
329    }
330
331    delwin(dialog);
332    free(status);
333    return -1; /* ESC pressed */
334}
335

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