[PATCH] Enhancing accessibility of lxdialog
[linux-2.6.git] / 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
26 static int list_width, check_x, item_x;
27
28 /*
29  * Print list item
30  */
31 static 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  */
59 static 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  */
95 static 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  */
111 int 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(dialog);
200         wnoutrefresh(list);
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                                         print_arrows(dialog, choice, item_no,
229                                                      scroll, box_y, box_x + check_x + 5, list_height);
230
231                                         wnoutrefresh(dialog);
232                                         wrefresh(list);
233
234                                         continue;       /* wait for another key press */
235                                 } else
236                                         i = choice - 1;
237                         } else if (key == KEY_DOWN || key == '+') {
238                                 if (choice == max_choice - 1) {
239                                         if (scroll + choice >= item_no - 1)
240                                                 continue;
241                                         /* Scroll list up */
242                                         if (list_height > 1) {
243                                                 /* De-highlight current last item before scrolling up */
244                                                 print_item(list, items[(scroll + max_choice - 1) * 3 + 1],
245                                                            status[scroll + max_choice - 1],
246                                                            max_choice - 1, FALSE);
247                                                 scrollok(list, TRUE);
248                                                 wscrl(list, 1);
249                                                 scrollok(list, FALSE);
250                                         }
251                                         scroll++;
252                                         print_item(list, items[(scroll + max_choice - 1) * 3 + 1],
253                                                    status[scroll + max_choice - 1], max_choice - 1, TRUE);
254
255                                         print_arrows(dialog, choice, item_no,
256                                                      scroll, box_y, box_x + check_x + 5, list_height);
257
258                                         wnoutrefresh(dialog);
259                                         wrefresh(list);
260
261                                         continue;       /* wait for another key press */
262                                 } else
263                                         i = choice + 1;
264                         }
265                         if (i != choice) {
266                                 /* De-highlight current item */
267                                 print_item(list, items[(scroll + choice) * 3 + 1],
268                                            status[scroll + choice], choice, FALSE);
269                                 /* Highlight new item */
270                                 choice = i;
271                                 print_item(list, items[(scroll + choice) * 3 + 1],
272                                            status[scroll + choice], choice, TRUE);
273                                 wnoutrefresh(dialog);
274                                 wrefresh(list);
275                         }
276                         continue;       /* wait for another key press */
277                 }
278                 switch (key) {
279                 case 'H':
280                 case 'h':
281                 case '?':
282                         fprintf(stderr, "%s", items[(scroll + choice) * 3]);
283                         delwin(dialog);
284                         free(status);
285                         return 1;
286                 case TAB:
287                 case KEY_LEFT:
288                 case KEY_RIGHT:
289                         button = ((key == KEY_LEFT ? --button : ++button) < 0)
290                             ? 1 : (button > 1 ? 0 : button);
291
292                         print_buttons(dialog, height, width, button);
293                         wrefresh(dialog);
294                         break;
295                 case 'S':
296                 case 's':
297                 case ' ':
298                 case '\n':
299                         if (!button) {
300                                 if (!status[scroll + choice]) {
301                                         for (i = 0; i < item_no; i++)
302                                                 status[i] = 0;
303                                         status[scroll + choice] = 1;
304                                         for (i = 0; i < max_choice; i++)
305                                                 print_item(list, items[(scroll + i) * 3 + 1],
306                                                            status[scroll + i], i, i == choice);
307                                 }
308                                 wnoutrefresh(dialog);
309                                 wrefresh(list);
310
311                                 for (i = 0; i < item_no; i++)
312                                         if (status[i])
313                                                 fprintf(stderr, "%s", items[i * 3]);
314                         } else
315                                 fprintf(stderr, "%s", items[(scroll + choice) * 3]);
316                         delwin(dialog);
317                         free(status);
318                         return button;
319                 case 'X':
320                 case 'x':
321                         key = ESC;
322                 case ESC:
323                         break;
324                 }
325
326                 /* Now, update everything... */
327                 doupdate();
328         }
329
330         delwin(dialog);
331         free(status);
332         return -1;              /* ESC pressed */
333 }