Root/scripts/kconfig/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, int choice, int selected)
32{
33    int i;
34    char *list_item = malloc(list_width + 1);
35
36    strncpy(list_item, item_str(), list_width - item_x);
37    list_item[list_width - item_x] = '\0';
38
39    /* Clear 'residue' of last item */
40    wattrset(win, dlg.menubox.atr);
41    wmove(win, choice, 0);
42    for (i = 0; i < list_width; i++)
43        waddch(win, ' ');
44
45    wmove(win, choice, check_x);
46    wattrset(win, selected ? dlg.check_selected.atr
47         : dlg.check.atr);
48    if (!item_is_tag(':'))
49        wprintw(win, "(%c)", item_is_tag('X') ? 'X' : ' ');
50
51    wattrset(win, selected ? dlg.tag_selected.atr : dlg.tag.atr);
52    mvwaddch(win, choice, item_x, list_item[0]);
53    wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
54    waddstr(win, list_item + 1);
55    if (selected) {
56        wmove(win, choice, check_x + 1);
57        wrefresh(win);
58    }
59    free(list_item);
60}
61
62/*
63 * Print the scroll indicators.
64 */
65static void print_arrows(WINDOW * win, int choice, int item_no, int scroll,
66         int y, int x, int height)
67{
68    wmove(win, y, x);
69
70    if (scroll > 0) {
71        wattrset(win, dlg.uarrow.atr);
72        waddch(win, ACS_UARROW);
73        waddstr(win, "(-)");
74    } else {
75        wattrset(win, dlg.menubox.atr);
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, dlg.darrow.atr);
87        waddch(win, ACS_DARROW);
88        waddstr(win, "(+)");
89    } else {
90        wattrset(win, dlg.menubox_border.atr);
91        waddch(win, ACS_HLINE);
92        waddch(win, ACS_HLINE);
93        waddch(win, ACS_HLINE);
94        waddch(win, ACS_HLINE);
95    }
96}
97
98/*
99 * Display the termination buttons
100 */
101static void print_buttons(WINDOW * dialog, int height, int width, int selected)
102{
103    int x = width / 2 - 11;
104    int y = height - 2;
105
106    print_button(dialog, gettext("Select"), y, x, selected == 0);
107    print_button(dialog, gettext(" Help "), y, x + 14, selected == 1);
108
109    wmove(dialog, y, x + 1 + 14 * selected);
110    wrefresh(dialog);
111}
112
113/*
114 * Display a dialog box with a list of options that can be turned on or off
115 * in the style of radiolist (only one option turned on at a time).
116 */
117int dialog_checklist(const char *title, const char *prompt, int height,
118             int width, int list_height)
119{
120    int i, x, y, box_x, box_y;
121    int key = 0, button = 0, choice = 0, scroll = 0, max_choice;
122    WINDOW *dialog, *list;
123
124    /* which item to highlight */
125    item_foreach() {
126        if (item_is_tag('X'))
127            choice = item_n();
128        if (item_is_selected()) {
129            choice = item_n();
130            break;
131        }
132    }
133
134do_resize:
135    if (getmaxy(stdscr) < (height + 6))
136        return -ERRDISPLAYTOOSMALL;
137    if (getmaxx(stdscr) < (width + 6))
138        return -ERRDISPLAYTOOSMALL;
139
140    max_choice = MIN(list_height, item_count());
141
142    /* center dialog box on screen */
143    x = (COLS - width) / 2;
144    y = (LINES - height) / 2;
145
146    draw_shadow(stdscr, y, x, height, width);
147
148    dialog = newwin(height, width, y, x);
149    keypad(dialog, TRUE);
150
151    draw_box(dialog, 0, 0, height, width,
152         dlg.dialog.atr, dlg.border.atr);
153    wattrset(dialog, dlg.border.atr);
154    mvwaddch(dialog, height - 3, 0, ACS_LTEE);
155    for (i = 0; i < width - 2; i++)
156        waddch(dialog, ACS_HLINE);
157    wattrset(dialog, dlg.dialog.atr);
158    waddch(dialog, ACS_RTEE);
159
160    print_title(dialog, title, width);
161
162    wattrset(dialog, dlg.dialog.atr);
163    print_autowrap(dialog, prompt, width - 2, 1, 3);
164
165    list_width = width - 6;
166    box_y = height - list_height - 5;
167    box_x = (width - list_width) / 2 - 1;
168
169    /* create new window for the list */
170    list = subwin(dialog, list_height, list_width, y + box_y + 1,
171                  x + box_x + 1);
172
173    keypad(list, TRUE);
174
175    /* draw a box around the list items */
176    draw_box(dialog, box_y, box_x, list_height + 2, list_width + 2,
177             dlg.menubox_border.atr, dlg.menubox.atr);
178
179    /* Find length of longest item in order to center checklist */
180    check_x = 0;
181    item_foreach()
182        check_x = MAX(check_x, strlen(item_str()) + 4);
183    check_x = MIN(check_x, list_width);
184
185    check_x = (list_width - check_x) / 2;
186    item_x = check_x + 4;
187
188    if (choice >= list_height) {
189        scroll = choice - list_height + 1;
190        choice -= scroll;
191    }
192
193    /* Print the list */
194    for (i = 0; i < max_choice; i++) {
195        item_set(scroll + i);
196        print_item(list, i, i == choice);
197    }
198
199    print_arrows(dialog, choice, item_count(), scroll,
200             box_y, box_x + check_x + 5, list_height);
201
202    print_buttons(dialog, height, width, 0);
203
204    wnoutrefresh(dialog);
205    wnoutrefresh(list);
206    doupdate();
207
208    while (key != KEY_ESC) {
209        key = wgetch(dialog);
210
211        for (i = 0; i < max_choice; i++) {
212            item_set(i + scroll);
213            if (toupper(key) == toupper(item_str()[0]))
214                break;
215        }
216
217        if (i < max_choice || key == KEY_UP || key == KEY_DOWN ||
218            key == '+' || key == '-') {
219            if (key == KEY_UP || key == '-') {
220                if (!choice) {
221                    if (!scroll)
222                        continue;
223                    /* Scroll list down */
224                    if (list_height > 1) {
225                        /* De-highlight current first item */
226                        item_set(scroll);
227                        print_item(list, 0, FALSE);
228                        scrollok(list, TRUE);
229                        wscrl(list, -1);
230                        scrollok(list, FALSE);
231                    }
232                    scroll--;
233                    item_set(scroll);
234                    print_item(list, 0, TRUE);
235                    print_arrows(dialog, choice, item_count(),
236                             scroll, box_y, box_x + check_x + 5, list_height);
237
238                    wnoutrefresh(dialog);
239                    wrefresh(list);
240
241                    continue; /* wait for another key press */
242                } else
243                    i = choice - 1;
244            } else if (key == KEY_DOWN || key == '+') {
245                if (choice == max_choice - 1) {
246                    if (scroll + choice >= item_count() - 1)
247                        continue;
248                    /* Scroll list up */
249                    if (list_height > 1) {
250                        /* De-highlight current last item before scrolling up */
251                        item_set(scroll + max_choice - 1);
252                        print_item(list,
253                                max_choice - 1,
254                                FALSE);
255                        scrollok(list, TRUE);
256                        wscrl(list, 1);
257                        scrollok(list, FALSE);
258                    }
259                    scroll++;
260                    item_set(scroll + max_choice - 1);
261                    print_item(list, max_choice - 1, TRUE);
262
263                    print_arrows(dialog, choice, item_count(),
264                             scroll, box_y, box_x + check_x + 5, list_height);
265
266                    wnoutrefresh(dialog);
267                    wrefresh(list);
268
269                    continue; /* wait for another key press */
270                } else
271                    i = choice + 1;
272            }
273            if (i != choice) {
274                /* De-highlight current item */
275                item_set(scroll + choice);
276                print_item(list, choice, FALSE);
277                /* Highlight new item */
278                choice = i;
279                item_set(scroll + choice);
280                print_item(list, choice, TRUE);
281                wnoutrefresh(dialog);
282                wrefresh(list);
283            }
284            continue; /* wait for another key press */
285        }
286        switch (key) {
287        case 'H':
288        case 'h':
289        case '?':
290            button = 1;
291            /* fall-through */
292        case 'S':
293        case 's':
294        case ' ':
295        case '\n':
296            item_foreach()
297                item_set_selected(0);
298            item_set(scroll + choice);
299            item_set_selected(1);
300            delwin(list);
301            delwin(dialog);
302            return button;
303        case TAB:
304        case KEY_LEFT:
305        case KEY_RIGHT:
306            button = ((key == KEY_LEFT ? --button : ++button) < 0)
307                ? 1 : (button > 1 ? 0 : button);
308
309            print_buttons(dialog, height, width, button);
310            wrefresh(dialog);
311            break;
312        case 'X':
313        case 'x':
314            key = KEY_ESC;
315            break;
316        case KEY_ESC:
317            key = on_key_esc(dialog);
318            break;
319        case KEY_RESIZE:
320            delwin(list);
321            delwin(dialog);
322            on_key_resize();
323            goto do_resize;
324        }
325
326        /* Now, update everything... */
327        doupdate();
328    }
329    delwin(list);
330    delwin(dialog);
331    return key; /* ESC pressed */
332}
333

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