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Linux/scripts/kconfig/lxdialog/checklist.c

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  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, 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  */
 65 static 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  */
101 static 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  */
117 int 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 
134 do_resize:
135         if (getmaxy(stdscr) < (height + CHECKLIST_HEIGTH_MIN))
136                 return -ERRDISPLAYTOOSMALL;
137         if (getmaxx(stdscr) < (width + CHECKLIST_WIDTH_MIN))
138                 return -ERRDISPLAYTOOSMALL;
139 
140         max_choice = MIN(list_height, item_count());
141 
142         /* center dialog box on screen */
143         x = (getmaxx(stdscr) - width) / 2;
144         y = (getmaxy(stdscr) - 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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