Function dialog_menu

scripts/config/lxdialog/menubox.c:163–416

* Display a menu for choosing among a number of options */

 * 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);