// SPDX-License-Identifier: GPL-2.0+
/*
* menubox.c -- implements the menu box
*
* ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
* MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
*/
/*
* Changes by Clifford Wolf (god@clifford.at)
*
* [ 1998-06-13 ]
*
* *) A bugfix for the Page-Down problem
*
* *) Formerly when I used Page Down and Page Up, the cursor would be set
* to the first position in the menu box. Now lxdialog is a bit
* smarter and works more like other menu systems (just have a look at
* it).
*
* *) Formerly if I selected something my scrolling would be broken because
* lxdialog is re-invoked by the Menuconfig shell script, can't
* remember the last scrolling position, and just sets it so that the
* cursor is at the bottom of the box. Now it writes the temporary file
* lxdialog.scrltmp which contains this information. The file is
* deleted by lxdialog if the user leaves a submenu or enters a new
* one, but it would be nice if Menuconfig could make another "rm -f"
* just to be sure. Just try it out - you will recognise a difference!
*
* [ 1998-06-14 ]
*
* *) Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
* and menus change their size on the fly.
*
* *) If for some reason the last scrolling position is not saved by
* lxdialog, it sets the scrolling so that the selected item is in the
* middle of the menu box, not at the bottom.
*
* 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)
* Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus.
* This fixes a bug in Menuconfig where using ' ' to descend into menus
* would leave mis-synchronized lxdialog.scrltmp files lying around,
* fscanf would read in 'scroll', and eventually that value would get used.
*/
#include "dialog.h"
static int menu_width, item_x;
/*
* Print menu item
*/
static void do_print_item(WINDOW * win, const char *item, int line_y,
int selected, int hotkey)
{
int j;
char *menu_item = malloc(menu_width + 1);
strncpy(menu_item, item, menu_width - item_x);
menu_item[menu_width - item_x] = '\0';
j = first_alpha(menu_item, "YyNnMmHh");
/* Clear 'residue' of last item */
wattrset(win, dlg.menubox.atr);
wmove(win, line_y, 0);
#if OLD_NCURSES
{
int i;
for (i = 0; i < menu_width; i++)
waddch(win, ' ');
}
#else
wclrtoeol(win);
#endif
wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
mvwaddstr(win, line_y, item_x, menu_item);
if (hotkey) {
wattrset(win, selected ? dlg.tag_key_selected.atr
: dlg.tag_key.atr);
mvwaddch(win, line_y, item_x + j, menu_item[j]);
}
if (selected) {
wmove(win, line_y, item_x + 1);
}
free(menu_item);
wrefresh(win);
}
#define print_item(index, choice, selected) \
do { \
item_set(index); \
do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \
} while (0)
/*
* Print the scroll indicators.
*/
static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
int height)
{
int cur_y, cur_x;
getyx(win, cur_y, cur_x);
wmove(win, y, x);
if (scroll > 0) {
wattrset(win, dlg.uarrow.atr);
waddch(win, ACS_UARROW);
waddstr(win, "(-)");
} else {
wattrset(win, dlg.menubox.atr);
waddch(win, ACS_HLINE);
waddch(win, ACS_HLINE);
waddch(win, ACS_HLINE);
waddch(win, ACS_HLINE);
}
y = y + height + 1;
wmove(win, y, x);
wrefresh(win);
if ((height < item_no) && (scroll + height < item_no)) {
wattrset(win, dlg.darrow.atr);
waddch(win, ACS_DARROW);
waddstr(win, "(+)");
} else {
wattrset(win, dlg.menubox_border.atr);
waddch(win, ACS_HLINE);
waddch(win, ACS_HLINE);
waddch(win, ACS_HLINE);
waddch(win, ACS_HLINE);
}
wmove(win, cur_y, cur_x);
wrefresh(win);
}
/*
* Display the termination buttons.
*/
static void print_buttons(WINDOW * win, int height, int width, int selected)
{
int x = width / 2 - 28;
int y = height - 2;
print_button(win, gettext("Select"), y, x, selected == 0);
print_button(win, gettext(" Exit "), y, x + 12, selected == 1);
print_button(win, gettext(" Help "), y, x + 24, selected == 2);
print_button(win, gettext(" Save "), y, x + 36, selected == 3);
print_button(win, gettext(" Load "), y, x + 48, selected == 4);
wmove(win, y, x + 1 + 12 * selected);
wrefresh(win);
}
/* scroll up n lines (n may be negative) */
static void do_scroll(WINDOW *win, int *scroll, int n)
{
/* Scroll menu up */
scrollok(win, TRUE);
wscrl(win, n);
scrollok(win, FALSE);
*scroll = *scroll + n;
wrefresh(win);
}
/*
* Display a menu for choosing among a number of options
*/
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 */
}