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 , item_x; |
49 | |
50 | /* |
51 | * Print menu item |
52 | */ |
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 * = malloc(size: menu_width + 1); |
58 | |
59 | strncpy(dest: menu_item, src: item, n: menu_width - item_x); |
60 | menu_item[menu_width - item_x] = '\0'; |
61 | j = first_alpha(string: menu_item, exempt: "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(ptr: 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 | */ |
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 | */ |
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, label: "Select" , y, x, selected: selected == 0); |
140 | print_button(win, label: " Exit " , y, x: x + 12, selected: selected == 1); |
141 | print_button(win, label: " Help " , y, x: x + 24, selected: selected == 2); |
142 | print_button(win, label: " Save " , y, x: x + 36, selected: selected == 3); |
143 | print_button(win, label: " Load " , y, x: x + 48, selected: 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) */ |
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 | */ |
163 | int (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, ; |
168 | int key = 0, button = 0, scroll = 0, choice = 0; |
169 | int first_item = 0, max_choice; |
170 | WINDOW *dialog, *; |
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(win: stdscr, y, x, height, width); |
189 | |
190 | dialog = newwin(height, width, y, x); |
191 | keypad(dialog, TRUE); |
192 | |
193 | draw_box(win: dialog, y: 0, x: 0, height, width, |
194 | box: dlg.dialog.atr, border: 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(win: dialog, prompt, width: width - 2, y: 1, x: 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(win: dialog, y: box_y, x: box_x, height: menu_height + 2, width: menu_width + 2, |
219 | box: dlg.menubox_border.atr, border: 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(win: dialog, item_no: item_count(), scroll, |
255 | y: box_y, x: box_x + item_x + 1, height: menu_height); |
256 | |
257 | print_buttons(win: dialog, height, width, selected: 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(s: "ynmh" , c: key)) |
268 | i = max_choice; |
269 | else { |
270 | for (i = choice + 1; i < max_choice; i++) { |
271 | item_set(n: scroll + i); |
272 | j = first_alpha(string: item_str(), exempt: "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(n: scroll + i); |
279 | j = first_alpha(string: item_str(), exempt: "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(win: menu, scroll: &scroll, n: -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(win: menu, scroll: &scroll, n: 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(win: menu, scroll: &scroll, n: -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(win: menu, scroll: &scroll, n: 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(win: dialog, item_no: item_count(), scroll, |
344 | y: box_y, x: box_x + item_x + 1, height: 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(win: dialog, height, width, selected: 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(n: scroll + choice); |
377 | item_set_selected(val: 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(win: 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 | |