1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * menubox.c -- implements the menu box
4 *
5 * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
6 * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
7 */
8
9 /*
10 * Changes by Clifford Wolf (god@clifford.at)
11 *
12 * [ 1998-06-13 ]
13 *
14 * *) A bugfix for the Page-Down problem
15 *
16 * *) Formerly when I used Page Down and Page Up, the cursor would be set
17 * to the first position in the menu box. Now lxdialog is a bit
18 * smarter and works more like other menu systems (just have a look at
19 * it).
20 *
21 * *) Formerly if I selected something my scrolling would be broken because
22 * lxdialog is re-invoked by the Menuconfig shell script, can't
23 * remember the last scrolling position, and just sets it so that the
24 * cursor is at the bottom of the box. Now it writes the temporary file
25 * lxdialog.scrltmp which contains this information. The file is
26 * deleted by lxdialog if the user leaves a submenu or enters a new
27 * one, but it would be nice if Menuconfig could make another "rm -f"
28 * just to be sure. Just try it out - you will recognise a difference!
29 *
30 * [ 1998-06-14 ]
31 *
32 * *) Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
33 * and menus change their size on the fly.
34 *
35 * *) If for some reason the last scrolling position is not saved by
36 * lxdialog, it sets the scrolling so that the selected item is in the
37 * middle of the menu box, not at the bottom.
38 *
39 * 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)
40 * Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus.
41 * This fixes a bug in Menuconfig where using ' ' to descend into menus
42 * would leave mis-synchronized lxdialog.scrltmp files lying around,
43 * fscanf would read in 'scroll', and eventually that value would get used.
44 */
45
46 #include "dialog.h"
47
48 static int menu_width, item_x;
49
50 /*
51 * Print menu item
52 */
do_print_item(WINDOW * win,const char * item,int line_y,int selected,int hotkey)53 static void do_print_item(WINDOW * win, const char *item, int line_y,
54 int selected, int hotkey)
55 {
56 int j;
57 char *menu_item = malloc(menu_width + 1);
58
59 strncpy(menu_item, item, menu_width - item_x);
60 menu_item[menu_width - item_x] = '\0';
61 j = first_alpha(menu_item, "YyNnMmHh");
62
63 /* Clear 'residue' of last item */
64 wattrset(win, dlg.menubox.atr);
65 wmove(win, line_y, 0);
66 wclrtoeol(win);
67 wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
68 mvwaddstr(win, line_y, item_x, menu_item);
69 if (hotkey) {
70 wattrset(win, selected ? dlg.tag_key_selected.atr
71 : dlg.tag_key.atr);
72 mvwaddch(win, line_y, item_x + j, menu_item[j]);
73 }
74 if (selected) {
75 wmove(win, line_y, item_x + 1);
76 }
77 free(menu_item);
78 wrefresh(win);
79 }
80
81 #define print_item(index, choice, selected) \
82 do { \
83 item_set(index); \
84 do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \
85 } while (0)
86
87 /*
88 * Print the scroll indicators.
89 */
print_arrows(WINDOW * win,int item_no,int scroll,int y,int x,int height)90 static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
91 int height)
92 {
93 int cur_y, cur_x;
94
95 getyx(win, cur_y, cur_x);
96
97 wmove(win, y, x);
98
99 if (scroll > 0) {
100 wattrset(win, dlg.uarrow.atr);
101 waddch(win, ACS_UARROW);
102 waddstr(win, "(-)");
103 } else {
104 wattrset(win, dlg.menubox.atr);
105 waddch(win, ACS_HLINE);
106 waddch(win, ACS_HLINE);
107 waddch(win, ACS_HLINE);
108 waddch(win, ACS_HLINE);
109 }
110
111 y = y + height + 1;
112 wmove(win, y, x);
113 wrefresh(win);
114
115 if ((height < item_no) && (scroll + height < item_no)) {
116 wattrset(win, dlg.darrow.atr);
117 waddch(win, ACS_DARROW);
118 waddstr(win, "(+)");
119 } else {
120 wattrset(win, dlg.menubox_border.atr);
121 waddch(win, ACS_HLINE);
122 waddch(win, ACS_HLINE);
123 waddch(win, ACS_HLINE);
124 waddch(win, ACS_HLINE);
125 }
126
127 wmove(win, cur_y, cur_x);
128 wrefresh(win);
129 }
130
131 /*
132 * Display the termination buttons.
133 */
print_buttons(WINDOW * win,int height,int width,int selected)134 static void print_buttons(WINDOW * win, int height, int width, int selected)
135 {
136 int x = width / 2 - 28;
137 int y = height - 2;
138
139 print_button(win, "Select", y, x, selected == 0);
140 print_button(win, " Exit ", y, x + 12, selected == 1);
141 print_button(win, " Help ", y, x + 24, selected == 2);
142 print_button(win, " Save ", y, x + 36, selected == 3);
143 print_button(win, " Load ", y, x + 48, selected == 4);
144
145 wmove(win, y, x + 1 + 12 * selected);
146 wrefresh(win);
147 }
148
149 /* scroll up n lines (n may be negative) */
do_scroll(WINDOW * win,int * scroll,int n)150 static void do_scroll(WINDOW *win, int *scroll, int n)
151 {
152 /* Scroll menu up */
153 scrollok(win, TRUE);
154 wscrl(win, n);
155 scrollok(win, FALSE);
156 *scroll = *scroll + n;
157 wrefresh(win);
158 }
159
160 /*
161 * Display a menu for choosing among a number of options
162 */
dialog_menu(const char * title,const char * prompt,const void * selected,int * s_scroll)163 int dialog_menu(const char *title, const char *prompt,
164 const void *selected, int *s_scroll)
165 {
166 int i, j, x, y, box_x, box_y;
167 int height, width, menu_height;
168 int key = 0, button = 0, scroll = 0, choice = 0;
169 int first_item = 0, max_choice;
170 WINDOW *dialog, *menu;
171
172 do_resize:
173 height = getmaxy(stdscr);
174 width = getmaxx(stdscr);
175 if (height < MENUBOX_HEIGHT_MIN || width < MENUBOX_WIDTH_MIN)
176 return -ERRDISPLAYTOOSMALL;
177
178 height -= 4;
179 width -= 5;
180 menu_height = height - 10;
181
182 max_choice = MIN(menu_height, item_count());
183
184 /* center dialog box on screen */
185 x = (getmaxx(stdscr) - width) / 2;
186 y = (getmaxy(stdscr) - height) / 2;
187
188 draw_shadow(stdscr, y, x, height, width);
189
190 dialog = newwin(height, width, y, x);
191 keypad(dialog, TRUE);
192
193 draw_box(dialog, 0, 0, height, width,
194 dlg.dialog.atr, dlg.border.atr);
195 wattrset(dialog, dlg.border.atr);
196 mvwaddch(dialog, height - 3, 0, ACS_LTEE);
197 for (i = 0; i < width - 2; i++)
198 waddch(dialog, ACS_HLINE);
199 wattrset(dialog, dlg.dialog.atr);
200 wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
201 waddch(dialog, ACS_RTEE);
202
203 print_title(dialog, title, width);
204
205 wattrset(dialog, dlg.dialog.atr);
206 print_autowrap(dialog, prompt, width - 2, 1, 3);
207
208 menu_width = width - 6;
209 box_y = height - menu_height - 5;
210 box_x = (width - menu_width) / 2 - 1;
211
212 /* create new window for the menu */
213 menu = subwin(dialog, menu_height, menu_width,
214 y + box_y + 1, x + box_x + 1);
215 keypad(menu, TRUE);
216
217 /* draw a box around the menu items */
218 draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
219 dlg.menubox_border.atr, dlg.menubox.atr);
220
221 if (menu_width >= 80)
222 item_x = (menu_width - 70) / 2;
223 else
224 item_x = 4;
225
226 /* Set choice to default item */
227 item_foreach()
228 if (selected && (selected == item_data()))
229 choice = item_n();
230 /* get the saved scroll info */
231 scroll = *s_scroll;
232 if ((scroll <= choice) && (scroll + max_choice > choice) &&
233 (scroll >= 0) && (scroll + max_choice <= item_count())) {
234 first_item = scroll;
235 choice = choice - scroll;
236 } else {
237 scroll = 0;
238 }
239 if ((choice >= max_choice)) {
240 if (choice >= item_count() - max_choice / 2)
241 scroll = first_item = item_count() - max_choice;
242 else
243 scroll = first_item = choice - max_choice / 2;
244 choice = choice - scroll;
245 }
246
247 /* Print the menu */
248 for (i = 0; i < max_choice; i++) {
249 print_item(first_item + i, i, i == choice);
250 }
251
252 wnoutrefresh(menu);
253
254 print_arrows(dialog, item_count(), scroll,
255 box_y, box_x + item_x + 1, menu_height);
256
257 print_buttons(dialog, height, width, 0);
258 wmove(menu, choice, item_x + 1);
259 wrefresh(menu);
260
261 while (key != KEY_ESC) {
262 key = wgetch(menu);
263
264 if (key < 256 && isalpha(key))
265 key = tolower(key);
266
267 if (strchr("ynmh", key))
268 i = max_choice;
269 else {
270 for (i = choice + 1; i < max_choice; i++) {
271 item_set(scroll + i);
272 j = first_alpha(item_str(), "YyNnMmHh");
273 if (key == tolower(item_str()[j]))
274 break;
275 }
276 if (i == max_choice)
277 for (i = 0; i < max_choice; i++) {
278 item_set(scroll + i);
279 j = first_alpha(item_str(), "YyNnMmHh");
280 if (key == tolower(item_str()[j]))
281 break;
282 }
283 }
284
285 if (item_count() != 0 &&
286 (i < max_choice ||
287 key == KEY_UP || key == KEY_DOWN ||
288 key == '-' || key == '+' ||
289 key == KEY_PPAGE || key == KEY_NPAGE)) {
290 /* Remove highligt of current item */
291 print_item(scroll + choice, choice, FALSE);
292
293 if (key == KEY_UP || key == '-') {
294 if (choice < 2 && scroll) {
295 /* Scroll menu down */
296 do_scroll(menu, &scroll, -1);
297
298 print_item(scroll, 0, FALSE);
299 } else
300 choice = MAX(choice - 1, 0);
301
302 } else if (key == KEY_DOWN || key == '+') {
303 print_item(scroll+choice, choice, FALSE);
304
305 if ((choice > max_choice - 3) &&
306 (scroll + max_choice < item_count())) {
307 /* Scroll menu up */
308 do_scroll(menu, &scroll, 1);
309
310 print_item(scroll+max_choice - 1,
311 max_choice - 1, FALSE);
312 } else
313 choice = MIN(choice + 1, max_choice - 1);
314
315 } else if (key == KEY_PPAGE) {
316 scrollok(menu, TRUE);
317 for (i = 0; (i < max_choice); i++) {
318 if (scroll > 0) {
319 do_scroll(menu, &scroll, -1);
320 print_item(scroll, 0, FALSE);
321 } else {
322 if (choice > 0)
323 choice--;
324 }
325 }
326
327 } else if (key == KEY_NPAGE) {
328 for (i = 0; (i < max_choice); i++) {
329 if (scroll + max_choice < item_count()) {
330 do_scroll(menu, &scroll, 1);
331 print_item(scroll+max_choice-1,
332 max_choice - 1, FALSE);
333 } else {
334 if (choice + 1 < max_choice)
335 choice++;
336 }
337 }
338 } else
339 choice = i;
340
341 print_item(scroll + choice, choice, TRUE);
342
343 print_arrows(dialog, item_count(), scroll,
344 box_y, box_x + item_x + 1, menu_height);
345
346 wnoutrefresh(dialog);
347 wrefresh(menu);
348
349 continue; /* wait for another key press */
350 }
351
352 switch (key) {
353 case KEY_LEFT:
354 case TAB:
355 case KEY_RIGHT:
356 button = ((key == KEY_LEFT ? --button : ++button) < 0)
357 ? 4 : (button > 4 ? 0 : button);
358
359 print_buttons(dialog, height, width, button);
360 wrefresh(menu);
361 break;
362 case ' ':
363 case 's':
364 case 'y':
365 case 'n':
366 case 'm':
367 case '/':
368 case 'h':
369 case '?':
370 case 'z':
371 case '\n':
372 /* save scroll info */
373 *s_scroll = scroll;
374 delwin(menu);
375 delwin(dialog);
376 item_set(scroll + choice);
377 item_set_selected(1);
378 switch (key) {
379 case 'h':
380 case '?':
381 return 2;
382 case 's':
383 case 'y':
384 return 5;
385 case 'n':
386 return 6;
387 case 'm':
388 return 7;
389 case ' ':
390 return 8;
391 case '/':
392 return 9;
393 case 'z':
394 return 10;
395 case '\n':
396 return button;
397 }
398 return 0;
399 case 'e':
400 case 'x':
401 key = KEY_ESC;
402 break;
403 case KEY_ESC:
404 key = on_key_esc(menu);
405 break;
406 case KEY_RESIZE:
407 on_key_resize();
408 delwin(menu);
409 delwin(dialog);
410 goto do_resize;
411 }
412 }
413 delwin(menu);
414 delwin(dialog);
415 return key; /* ESC pressed */
416 }
417