in scripts/kconfig/lxdialog/menubox.c [171:424]
int dialog_menu(const char *title, const char *prompt,
const void *selected, int *s_scroll)
{
int i, j, x, y, box_x, box_y;
int height, width, menu_height;
int key = 0, button = 0, scroll = 0, choice = 0;
int first_item = 0, max_choice;
WINDOW *dialog, *menu;
do_resize:
height = getmaxy(stdscr);
width = getmaxx(stdscr);
if (height < MENUBOX_HEIGTH_MIN || width < MENUBOX_WIDTH_MIN)
return -ERRDISPLAYTOOSMALL;
height -= 4;
width -= 5;
menu_height = height - 10;
max_choice = MIN(menu_height, item_count());
/* center dialog box on screen */
x = (getmaxx(stdscr) - width) / 2;
y = (getmaxy(stdscr) - height) / 2;
draw_shadow(stdscr, y, x, height, width);
dialog = newwin(height, width, y, x);
keypad(dialog, TRUE);
draw_box(dialog, 0, 0, height, width,
dlg.dialog.atr, dlg.border.atr);
wattrset(dialog, dlg.border.atr);
mvwaddch(dialog, height - 3, 0, ACS_LTEE);
for (i = 0; i < width - 2; i++)
waddch(dialog, ACS_HLINE);
wattrset(dialog, dlg.dialog.atr);
wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
waddch(dialog, ACS_RTEE);
print_title(dialog, title, width);
wattrset(dialog, dlg.dialog.atr);
print_autowrap(dialog, prompt, width - 2, 1, 3);
menu_width = width - 6;
box_y = height - menu_height - 5;
box_x = (width - menu_width) / 2 - 1;
/* create new window for the menu */
menu = subwin(dialog, menu_height, menu_width,
y + box_y + 1, x + box_x + 1);
keypad(menu, TRUE);
/* draw a box around the menu items */
draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
dlg.menubox_border.atr, dlg.menubox.atr);
if (menu_width >= 80)
item_x = (menu_width - 70) / 2;
else
item_x = 4;
/* Set choice to default item */
item_foreach()
if (selected && (selected == item_data()))
choice = item_n();
/* get the saved scroll info */
scroll = *s_scroll;
if ((scroll <= choice) && (scroll + max_choice > choice) &&
(scroll >= 0) && (scroll + max_choice <= item_count())) {
first_item = scroll;
choice = choice - scroll;
} else {
scroll = 0;
}
if ((choice >= max_choice)) {
if (choice >= item_count() - max_choice / 2)
scroll = first_item = item_count() - max_choice;
else
scroll = first_item = choice - max_choice / 2;
choice = choice - scroll;
}
/* Print the menu */
for (i = 0; i < max_choice; i++) {
print_item(first_item + i, i, i == choice);
}
wnoutrefresh(menu);
print_arrows(dialog, item_count(), scroll,
box_y, box_x + item_x + 1, menu_height);
print_buttons(dialog, height, width, 0);
wmove(menu, choice, item_x + 1);
wrefresh(menu);
while (key != KEY_ESC) {
key = wgetch(menu);
if (key < 256 && isalpha(key))
key = tolower(key);
if (strchr("ynmh", key))
i = max_choice;
else {
for (i = choice + 1; i < max_choice; i++) {
item_set(scroll + i);
j = first_alpha(item_str(), "YyNnMmHh");
if (key == tolower(item_str()[j]))
break;
}
if (i == max_choice)
for (i = 0; i < max_choice; i++) {
item_set(scroll + i);
j = first_alpha(item_str(), "YyNnMmHh");
if (key == tolower(item_str()[j]))
break;
}
}
if (item_count() != 0 &&
(i < max_choice ||
key == KEY_UP || key == KEY_DOWN ||
key == '-' || key == '+' ||
key == KEY_PPAGE || key == KEY_NPAGE)) {
/* Remove highligt of current item */
print_item(scroll + choice, choice, FALSE);
if (key == KEY_UP || key == '-') {
if (choice < 2 && scroll) {
/* Scroll menu down */
do_scroll(menu, &scroll, -1);
print_item(scroll, 0, FALSE);
} else
choice = MAX(choice - 1, 0);
} else if (key == KEY_DOWN || key == '+') {
print_item(scroll+choice, choice, FALSE);
if ((choice > max_choice - 3) &&
(scroll + max_choice < item_count())) {
/* Scroll menu up */
do_scroll(menu, &scroll, 1);
print_item(scroll+max_choice - 1,
max_choice - 1, FALSE);
} else
choice = MIN(choice + 1, max_choice - 1);
} else if (key == KEY_PPAGE) {
scrollok(menu, TRUE);
for (i = 0; (i < max_choice); i++) {
if (scroll > 0) {
do_scroll(menu, &scroll, -1);
print_item(scroll, 0, FALSE);
} else {
if (choice > 0)
choice--;
}
}
} else if (key == KEY_NPAGE) {
for (i = 0; (i < max_choice); i++) {
if (scroll + max_choice < item_count()) {
do_scroll(menu, &scroll, 1);
print_item(scroll+max_choice-1,
max_choice - 1, FALSE);
} else {
if (choice + 1 < max_choice)
choice++;
}
}
} else
choice = i;
print_item(scroll + choice, choice, TRUE);
print_arrows(dialog, item_count(), scroll,
box_y, box_x + item_x + 1, menu_height);
wnoutrefresh(dialog);
wrefresh(menu);
continue; /* wait for another key press */
}
switch (key) {
case KEY_LEFT:
case TAB:
case KEY_RIGHT:
button = ((key == KEY_LEFT ? --button : ++button) < 0)
? 4 : (button > 4 ? 0 : button);
print_buttons(dialog, height, width, button);
wrefresh(menu);
break;
case ' ':
case 's':
case 'y':
case 'n':
case 'm':
case '/':
case 'h':
case '?':
case 'z':
case '\n':
/* save scroll info */
*s_scroll = scroll;
delwin(menu);
delwin(dialog);
item_set(scroll + choice);
item_set_selected(1);
switch (key) {
case 'h':
case '?':
return 2;
case 's':
case 'y':
return 5;
case 'n':
return 6;
case 'm':
return 7;
case ' ':
return 8;
case '/':
return 9;
case 'z':
return 10;
case '\n':
return button;
}
return 0;
case 'e':
case 'x':
key = KEY_ESC;
break;
case KEY_ESC:
key = on_key_esc(menu);
break;
case KEY_RESIZE:
on_key_resize();
delwin(menu);
delwin(dialog);
goto do_resize;
}
}
delwin(menu);
delwin(dialog);
return key; /* ESC pressed */
}