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File Content: menubox.c

// 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);
	wclrtoeol(win);
	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, "Select", y, x, selected == 0);
	print_button(win, " Exit ", y, x + 12, selected == 1);
	print_button(win, " Help ", y, x + 24, selected == 2);
	print_button(win, " Save ", y, x + 36, selected == 3);
	print_button(win, " 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 */
}

Name	Size	Permission
BIG.FAT.WARNING	233 bytes	0644
checklist.c	7746 bytes	0644
dialog.h	5768 bytes	0644
inputbox.c	6507 bytes	0644
menubox.c	10422 bytes	0644
textbox.c	7631 bytes	0644
util.c	17647 bytes	0644
yesno.c	2262 bytes	0644

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