1 // SPDX-License-Identifier: GPL-2.0+
3 * menubox.c -- implements the menu box
14 * *) A bugfix for the Page-Down problem
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
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!
32 * *) Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
33 * and menus change their size on the fly.
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.
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.
48 static int menu_width, item_x;
53 static void do_print_item(WINDOW * win, const char *item, int line_y,
54 int selected, int hotkey)
57 char *menu_item = malloc(menu_width + 1);
59 strncpy(menu_item, item, menu_width - item_x);
60 menu_item[menu_width - item_x] = '\0';
61 j = first_alpha(menu_item, "YyNnMmHh");
63 /* Clear 'residue' of last item */
64 wattrset(win, dlg.menubox.atr);
65 wmove(win, line_y, 0);
69 for (i = 0; i < menu_width; i++)
75 wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
76 mvwaddstr(win, line_y, item_x, menu_item);
78 wattrset(win, selected ? dlg.tag_key_selected.atr
80 mvwaddch(win, line_y, item_x + j, menu_item[j]);
83 wmove(win, line_y, item_x + 1);
89 #define print_item(index, choice, selected) \
92 do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \
96 * Print the scroll indicators.
98 static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
103 getyx(win, cur_y, cur_x);
108 wattrset(win, dlg.uarrow.atr);
109 waddch(win, ACS_UARROW);
112 wattrset(win, dlg.menubox.atr);
113 waddch(win, ACS_HLINE);
114 waddch(win, ACS_HLINE);
115 waddch(win, ACS_HLINE);
116 waddch(win, ACS_HLINE);
123 if ((height < item_no) && (scroll + height < item_no)) {
124 wattrset(win, dlg.darrow.atr);
125 waddch(win, ACS_DARROW);
128 wattrset(win, dlg.menubox_border.atr);
129 waddch(win, ACS_HLINE);
130 waddch(win, ACS_HLINE);
131 waddch(win, ACS_HLINE);
132 waddch(win, ACS_HLINE);
135 wmove(win, cur_y, cur_x);
140 * Display the termination buttons.
142 static void print_buttons(WINDOW * win, int height, int width, int selected)
144 int x = width / 2 - 28;
147 print_button(win, "Select", y, x, selected == 0);
148 print_button(win, " Exit ", y, x + 12, selected == 1);
149 print_button(win, " Help ", y, x + 24, selected == 2);
150 print_button(win, " Save ", y, x + 36, selected == 3);
151 print_button(win, " Load ", y, x + 48, selected == 4);
153 wmove(win, y, x + 1 + 12 * selected);
157 /* scroll up n lines (n may be negative) */
158 static void do_scroll(WINDOW *win, int *scroll, int n)
163 scrollok(win, FALSE);
164 *scroll = *scroll + n;
169 * Display a menu for choosing among a number of options
171 int dialog_menu(const char *title, const char *prompt,
172 const void *selected, int *s_scroll)
174 int i, j, x, y, box_x, box_y;
175 int height, width, menu_height;
176 int key = 0, button = 0, scroll = 0, choice = 0;
177 int first_item = 0, max_choice;
178 WINDOW *dialog, *menu;
181 height = getmaxy(stdscr);
182 width = getmaxx(stdscr);
183 if (height < MENUBOX_HEIGTH_MIN || width < MENUBOX_WIDTH_MIN)
184 return -ERRDISPLAYTOOSMALL;
188 menu_height = height - 10;
190 max_choice = MIN(menu_height, item_count());
192 /* center dialog box on screen */
193 x = (getmaxx(stdscr) - width) / 2;
194 y = (getmaxy(stdscr) - height) / 2;
196 draw_shadow(stdscr, y, x, height, width);
198 dialog = newwin(height, width, y, x);
199 keypad(dialog, TRUE);
201 draw_box(dialog, 0, 0, height, width,
202 dlg.dialog.atr, dlg.border.atr);
203 wattrset(dialog, dlg.border.atr);
204 mvwaddch(dialog, height - 3, 0, ACS_LTEE);
205 for (i = 0; i < width - 2; i++)
206 waddch(dialog, ACS_HLINE);
207 wattrset(dialog, dlg.dialog.atr);
208 wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
209 waddch(dialog, ACS_RTEE);
211 print_title(dialog, title, width);
213 wattrset(dialog, dlg.dialog.atr);
214 print_autowrap(dialog, prompt, width - 2, 1, 3);
216 menu_width = width - 6;
217 box_y = height - menu_height - 5;
218 box_x = (width - menu_width) / 2 - 1;
220 /* create new window for the menu */
221 menu = subwin(dialog, menu_height, menu_width,
222 y + box_y + 1, x + box_x + 1);
225 /* draw a box around the menu items */
226 draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
227 dlg.menubox_border.atr, dlg.menubox.atr);
229 if (menu_width >= 80)
230 item_x = (menu_width - 70) / 2;
234 /* Set choice to default item */
236 if (selected && (selected == item_data()))
238 /* get the saved scroll info */
240 if ((scroll <= choice) && (scroll + max_choice > choice) &&
241 (scroll >= 0) && (scroll + max_choice <= item_count())) {
243 choice = choice - scroll;
247 if ((choice >= max_choice)) {
248 if (choice >= item_count() - max_choice / 2)
249 scroll = first_item = item_count() - max_choice;
251 scroll = first_item = choice - max_choice / 2;
252 choice = choice - scroll;
256 for (i = 0; i < max_choice; i++) {
257 print_item(first_item + i, i, i == choice);
262 print_arrows(dialog, item_count(), scroll,
263 box_y, box_x + item_x + 1, menu_height);
265 print_buttons(dialog, height, width, 0);
266 wmove(menu, choice, item_x + 1);
269 while (key != KEY_ESC) {
272 if (key < 256 && isalpha(key))
275 if (strchr("ynmh", key))
278 for (i = choice + 1; i < max_choice; i++) {
279 item_set(scroll + i);
280 j = first_alpha(item_str(), "YyNnMmHh");
281 if (key == tolower(item_str()[j]))
285 for (i = 0; i < max_choice; i++) {
286 item_set(scroll + i);
287 j = first_alpha(item_str(), "YyNnMmHh");
288 if (key == tolower(item_str()[j]))
293 if (item_count() != 0 &&
295 key == KEY_UP || key == KEY_DOWN ||
296 key == '-' || key == '+' ||
297 key == KEY_PPAGE || key == KEY_NPAGE)) {
298 /* Remove highligt of current item */
299 print_item(scroll + choice, choice, FALSE);
301 if (key == KEY_UP || key == '-') {
302 if (choice < 2 && scroll) {
303 /* Scroll menu down */
304 do_scroll(menu, &scroll, -1);
306 print_item(scroll, 0, FALSE);
308 choice = MAX(choice - 1, 0);
310 } else if (key == KEY_DOWN || key == '+') {
311 print_item(scroll+choice, choice, FALSE);
313 if ((choice > max_choice - 3) &&
314 (scroll + max_choice < item_count())) {
316 do_scroll(menu, &scroll, 1);
318 print_item(scroll+max_choice - 1,
319 max_choice - 1, FALSE);
321 choice = MIN(choice + 1, max_choice - 1);
323 } else if (key == KEY_PPAGE) {
324 scrollok(menu, TRUE);
325 for (i = 0; (i < max_choice); i++) {
327 do_scroll(menu, &scroll, -1);
328 print_item(scroll, 0, FALSE);
335 } else if (key == KEY_NPAGE) {
336 for (i = 0; (i < max_choice); i++) {
337 if (scroll + max_choice < item_count()) {
338 do_scroll(menu, &scroll, 1);
339 print_item(scroll+max_choice-1,
340 max_choice - 1, FALSE);
342 if (choice + 1 < max_choice)
349 print_item(scroll + choice, choice, TRUE);
351 print_arrows(dialog, item_count(), scroll,
352 box_y, box_x + item_x + 1, menu_height);
354 wnoutrefresh(dialog);
357 continue; /* wait for another key press */
364 button = ((key == KEY_LEFT ? --button : ++button) < 0)
365 ? 4 : (button > 4 ? 0 : button);
367 print_buttons(dialog, height, width, button);
380 /* save scroll info */
384 item_set(scroll + choice);
385 item_set_selected(1);
412 key = on_key_esc(menu);
423 return key; /* ESC pressed */