yann@1: /*
yann@1:  *  menubox.c -- implements the menu box
yann@1:  *
yann@1:  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
yann@1:  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
yann@1:  *
yann@1:  *  This program is free software; you can redistribute it and/or
yann@1:  *  modify it under the terms of the GNU General Public License
yann@1:  *  as published by the Free Software Foundation; either version 2
yann@1:  *  of the License, or (at your option) any later version.
yann@1:  *
yann@1:  *  This program is distributed in the hope that it will be useful,
yann@1:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
yann@1:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
yann@1:  *  GNU General Public License for more details.
yann@1:  *
yann@1:  *  You should have received a copy of the GNU General Public License
yann@1:  *  along with this program; if not, write to the Free Software
yann@1:  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
yann@1:  */
yann@1: 
yann@1: /*
yann@1:  *  Changes by Clifford Wolf (god@clifford.at)
yann@1:  *
yann@1:  *  [ 1998-06-13 ]
yann@1:  *
yann@1:  *    *)  A bugfix for the Page-Down problem
yann@1:  *
yann@1:  *    *)  Formerly when I used Page Down and Page Up, the cursor would be set 
yann@1:  *        to the first position in the menu box.  Now lxdialog is a bit
yann@1:  *        smarter and works more like other menu systems (just have a look at
yann@1:  *        it).
yann@1:  *
yann@1:  *    *)  Formerly if I selected something my scrolling would be broken because
yann@1:  *        lxdialog is re-invoked by the Menuconfig shell script, can't
yann@1:  *        remember the last scrolling position, and just sets it so that the
yann@1:  *        cursor is at the bottom of the box.  Now it writes the temporary file
yann@1:  *        lxdialog.scrltmp which contains this information. The file is
yann@1:  *        deleted by lxdialog if the user leaves a submenu or enters a new
yann@1:  *        one, but it would be nice if Menuconfig could make another "rm -f"
yann@1:  *        just to be sure.  Just try it out - you will recognise a difference!
yann@1:  *
yann@1:  *  [ 1998-06-14 ]
yann@1:  *
yann@1:  *    *)  Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
yann@1:  *        and menus change their size on the fly.
yann@1:  *
yann@1:  *    *)  If for some reason the last scrolling position is not saved by
yann@1:  *        lxdialog, it sets the scrolling so that the selected item is in the
yann@1:  *        middle of the menu box, not at the bottom.
yann@1:  *
yann@1:  * 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)
yann@1:  * Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus.
yann@1:  * This fixes a bug in Menuconfig where using ' ' to descend into menus
yann@1:  * would leave mis-synchronized lxdialog.scrltmp files lying around,
yann@1:  * fscanf would read in 'scroll', and eventually that value would get used.
yann@1:  */
yann@1: 
yann@1: #include "dialog.h"
yann@1: 
yann@1: static int menu_width, item_x;
yann@1: 
yann@1: /*
yann@1:  * Print menu item
yann@1:  */
yann@1: static void do_print_item(WINDOW * win, const char *item, int line_y,
yann@1:                           int selected, int hotkey)
yann@1: {
yann@1: 	int j;
yann@1: 	char *menu_item = malloc(menu_width + 1);
yann@1: 
yann@1: 	strncpy(menu_item, item, menu_width - item_x);
yann@1: 	menu_item[menu_width - item_x] = '\0';
yann@1: 	j = first_alpha(menu_item, "YyNnMmHh");
yann@1: 
yann@1: 	/* Clear 'residue' of last item */
yann@1: 	wattrset(win, dlg.menubox.atr);
yann@1: 	wmove(win, line_y, 0);
yann@1: #if OLD_NCURSES
yann@1: 	{
yann@1: 		int i;
yann@1: 		for (i = 0; i < menu_width; i++)
yann@1: 			waddch(win, ' ');
yann@1: 	}
yann@1: #else
yann@1: 	wclrtoeol(win);
yann@1: #endif
yann@1: 	wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
yann@1: 	mvwaddstr(win, line_y, item_x, menu_item);
yann@1: 	if (hotkey) {
yann@1: 		wattrset(win, selected ? dlg.tag_key_selected.atr
yann@1: 			 : dlg.tag_key.atr);
yann@1: 		mvwaddch(win, line_y, item_x + j, menu_item[j]);
yann@1: 	}
yann@1: 	if (selected) {
yann@1: 		wmove(win, line_y, item_x + 1);
yann@1: 	}
yann@1: 	free(menu_item);
yann@1: 	wrefresh(win);
yann@1: }
yann@1: 
yann@1: #define print_item(index, choice, selected)				\
yann@1: do {									\
yann@1: 	item_set(index);						\
yann@1: 	do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \
yann@1: } while (0)
yann@1: 
yann@1: /*
yann@1:  * Print the scroll indicators.
yann@1:  */
yann@1: static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
yann@1: 			 int height)
yann@1: {
yann@1: 	int cur_y, cur_x;
yann@1: 
yann@1: 	getyx(win, cur_y, cur_x);
yann@1: 
yann@1: 	wmove(win, y, x);
yann@1: 
yann@1: 	if (scroll > 0) {
yann@1: 		wattrset(win, dlg.uarrow.atr);
yann@1: 		waddch(win, ACS_UARROW);
yann@1: 		waddstr(win, "(-)");
yann@1: 	} else {
yann@1: 		wattrset(win, dlg.menubox.atr);
yann@1: 		waddch(win, ACS_HLINE);
yann@1: 		waddch(win, ACS_HLINE);
yann@1: 		waddch(win, ACS_HLINE);
yann@1: 		waddch(win, ACS_HLINE);
yann@1: 	}
yann@1: 
yann@1: 	y = y + height + 1;
yann@1: 	wmove(win, y, x);
yann@1: 	wrefresh(win);
yann@1: 
yann@1: 	if ((height < item_no) && (scroll + height < item_no)) {
yann@1: 		wattrset(win, dlg.darrow.atr);
yann@1: 		waddch(win, ACS_DARROW);
yann@1: 		waddstr(win, "(+)");
yann@1: 	} else {
yann@1: 		wattrset(win, dlg.menubox_border.atr);
yann@1: 		waddch(win, ACS_HLINE);
yann@1: 		waddch(win, ACS_HLINE);
yann@1: 		waddch(win, ACS_HLINE);
yann@1: 		waddch(win, ACS_HLINE);
yann@1: 	}
yann@1: 
yann@1: 	wmove(win, cur_y, cur_x);
yann@1: 	wrefresh(win);
yann@1: }
yann@1: 
yann@1: /*
yann@1:  * Display the termination buttons.
yann@1:  */
yann@1: static void print_buttons(WINDOW * win, int height, int width, int selected)
yann@1: {
yann@1: 	int x = width / 2 - 16;
yann@1: 	int y = height - 2;
yann@1: 
yann@943: 	print_button(win, gettext("Select"), y, x, selected == 0);
yann@943: 	print_button(win, gettext(" Exit "), y, x + 12, selected == 1);
yann@943: 	print_button(win, gettext(" Help "), y, x + 24, selected == 2);
yann@1: 
yann@1: 	wmove(win, y, x + 1 + 12 * selected);
yann@1: 	wrefresh(win);
yann@1: }
yann@1: 
yann@1: /* scroll up n lines (n may be negative) */
yann@1: static void do_scroll(WINDOW *win, int *scroll, int n)
yann@1: {
yann@1: 	/* Scroll menu up */
yann@1: 	scrollok(win, TRUE);
yann@1: 	wscrl(win, n);
yann@1: 	scrollok(win, FALSE);
yann@1: 	*scroll = *scroll + n;
yann@1: 	wrefresh(win);
yann@1: }
yann@1: 
yann@1: /*
yann@1:  * Display a menu for choosing among a number of options
yann@1:  */
yann@1: int dialog_menu(const char *title, const char *prompt,
yann@1:                 const void *selected, int *s_scroll)
yann@1: {
yann@1: 	int i, j, x, y, box_x, box_y;
yann@1: 	int height, width, menu_height;
yann@1: 	int key = 0, button = 0, scroll = 0, choice = 0;
yann@1: 	int first_item =  0, max_choice;
yann@1: 	WINDOW *dialog, *menu;
yann@1: 
yann@1: do_resize:
yann@1: 	height = getmaxy(stdscr);
yann@1: 	width = getmaxx(stdscr);
yann@1: 	if (height < 15 || width < 65)
yann@1: 		return -ERRDISPLAYTOOSMALL;
yann@1: 
yann@1: 	height -= 4;
yann@1: 	width  -= 5;
yann@1: 	menu_height = height - 10;
yann@1: 
yann@1: 	max_choice = MIN(menu_height, item_count());
yann@1: 
yann@1: 	/* center dialog box on screen */
yann@1: 	x = (COLS - width) / 2;
yann@1: 	y = (LINES - height) / 2;
yann@1: 
yann@1: 	draw_shadow(stdscr, y, x, height, width);
yann@1: 
yann@1: 	dialog = newwin(height, width, y, x);
yann@1: 	keypad(dialog, TRUE);
yann@1: 
yann@1: 	draw_box(dialog, 0, 0, height, width,
yann@1: 		 dlg.dialog.atr, dlg.border.atr);
yann@1: 	wattrset(dialog, dlg.border.atr);
yann@1: 	mvwaddch(dialog, height - 3, 0, ACS_LTEE);
yann@1: 	for (i = 0; i < width - 2; i++)
yann@1: 		waddch(dialog, ACS_HLINE);
yann@1: 	wattrset(dialog, dlg.dialog.atr);
yann@1: 	wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
yann@1: 	waddch(dialog, ACS_RTEE);
yann@1: 
yann@1: 	print_title(dialog, title, width);
yann@1: 
yann@1: 	wattrset(dialog, dlg.dialog.atr);
yann@1: 	print_autowrap(dialog, prompt, width - 2, 1, 3);
yann@1: 
yann@1: 	menu_width = width - 6;
yann@1: 	box_y = height - menu_height - 5;
yann@1: 	box_x = (width - menu_width) / 2 - 1;
yann@1: 
yann@1: 	/* create new window for the menu */
yann@1: 	menu = subwin(dialog, menu_height, menu_width,
yann@1: 		      y + box_y + 1, x + box_x + 1);
yann@1: 	keypad(menu, TRUE);
yann@1: 
yann@1: 	/* draw a box around the menu items */
yann@1: 	draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
yann@1: 		 dlg.menubox_border.atr, dlg.menubox.atr);
yann@1: 
yann@1: 	if (menu_width >= 80)
yann@1: 		item_x = (menu_width - 70) / 2;
yann@1: 	else
yann@1: 		item_x = 4;
yann@1: 
yann@1: 	/* Set choice to default item */
yann@1: 	item_foreach()
yann@1: 		if (selected && (selected == item_data()))
yann@1: 			choice = item_n();
yann@1: 	/* get the saved scroll info */
yann@1: 	scroll = *s_scroll;
yann@1: 	if ((scroll <= choice) && (scroll + max_choice > choice) &&
yann@1: 	   (scroll >= 0) && (scroll + max_choice <= item_count())) {
yann@1: 		first_item = scroll;
yann@1: 		choice = choice - scroll;
yann@1: 	} else {
yann@1: 		scroll = 0;
yann@1: 	}
yann@1: 	if ((choice >= max_choice)) {
yann@1: 		if (choice >= item_count() - max_choice / 2)
yann@1: 			scroll = first_item = item_count() - max_choice;
yann@1: 		else
yann@1: 			scroll = first_item = choice - max_choice / 2;
yann@1: 		choice = choice - scroll;
yann@1: 	}
yann@1: 
yann@1: 	/* Print the menu */
yann@1: 	for (i = 0; i < max_choice; i++) {
yann@1: 		print_item(first_item + i, i, i == choice);
yann@1: 	}
yann@1: 
yann@1: 	wnoutrefresh(menu);
yann@1: 
yann@1: 	print_arrows(dialog, item_count(), scroll,
yann@1: 		     box_y, box_x + item_x + 1, menu_height);
yann@1: 
yann@1: 	print_buttons(dialog, height, width, 0);
yann@1: 	wmove(menu, choice, item_x + 1);
yann@1: 	wrefresh(menu);
yann@1: 
yann@1: 	while (key != KEY_ESC) {
yann@1: 		key = wgetch(menu);
yann@1: 
yann@1: 		if (key < 256 && isalpha(key))
yann@1: 			key = tolower(key);
yann@1: 
yann@1: 		if (strchr("ynmh", key))
yann@1: 			i = max_choice;
yann@1: 		else {
yann@1: 			for (i = choice + 1; i < max_choice; i++) {
yann@1: 				item_set(scroll + i);
yann@1: 				j = first_alpha(item_str(), "YyNnMmHh");
yann@1: 				if (key == tolower(item_str()[j]))
yann@1: 					break;
yann@1: 			}
yann@1: 			if (i == max_choice)
yann@1: 				for (i = 0; i < max_choice; i++) {
yann@1: 					item_set(scroll + i);
yann@1: 					j = first_alpha(item_str(), "YyNnMmHh");
yann@1: 					if (key == tolower(item_str()[j]))
yann@1: 						break;
yann@1: 				}
yann@1: 		}
yann@1: 
yann@1: 		if (i < max_choice ||
yann@1: 		    key == KEY_UP || key == KEY_DOWN ||
yann@1: 		    key == '-' || key == '+' ||
yann@1: 		    key == KEY_PPAGE || key == KEY_NPAGE) {
yann@1: 			/* Remove highligt of current item */
yann@1: 			print_item(scroll + choice, choice, FALSE);
yann@1: 
yann@1: 			if (key == KEY_UP || key == '-') {
yann@1: 				if (choice < 2 && scroll) {
yann@1: 					/* Scroll menu down */
yann@1: 					do_scroll(menu, &scroll, -1);
yann@1: 
yann@1: 					print_item(scroll, 0, FALSE);
yann@1: 				} else
yann@1: 					choice = MAX(choice - 1, 0);
yann@1: 
yann@1: 			} else if (key == KEY_DOWN || key == '+') {
yann@1: 				print_item(scroll+choice, choice, FALSE);
yann@1: 
yann@1: 				if ((choice > max_choice - 3) &&
yann@1: 				    (scroll + max_choice < item_count())) {
yann@1: 					/* Scroll menu up */
yann@1: 					do_scroll(menu, &scroll, 1);
yann@1: 
yann@1: 					print_item(scroll+max_choice - 1,
yann@1: 						   max_choice - 1, FALSE);
yann@1: 				} else
yann@1: 					choice = MIN(choice + 1, max_choice - 1);
yann@1: 
yann@1: 			} else if (key == KEY_PPAGE) {
yann@1: 				scrollok(menu, TRUE);
yann@1: 				for (i = 0; (i < max_choice); i++) {
yann@1: 					if (scroll > 0) {
yann@1: 						do_scroll(menu, &scroll, -1);
yann@1: 						print_item(scroll, 0, FALSE);
yann@1: 					} else {
yann@1: 						if (choice > 0)
yann@1: 							choice--;
yann@1: 					}
yann@1: 				}
yann@1: 
yann@1: 			} else if (key == KEY_NPAGE) {
yann@1: 				for (i = 0; (i < max_choice); i++) {
yann@1: 					if (scroll + max_choice < item_count()) {
yann@1: 						do_scroll(menu, &scroll, 1);
yann@1: 						print_item(scroll+max_choice-1,
yann@1: 							   max_choice - 1, FALSE);
yann@1: 					} else {
yann@1: 						if (choice + 1 < max_choice)
yann@1: 							choice++;
yann@1: 					}
yann@1: 				}
yann@1: 			} else
yann@1: 				choice = i;
yann@1: 
yann@1: 			print_item(scroll + choice, choice, TRUE);
yann@1: 
yann@1: 			print_arrows(dialog, item_count(), scroll,
yann@1: 				     box_y, box_x + item_x + 1, menu_height);
yann@1: 
yann@1: 			wnoutrefresh(dialog);
yann@1: 			wrefresh(menu);
yann@1: 
yann@1: 			continue;	/* wait for another key press */
yann@1: 		}
yann@1: 
yann@1: 		switch (key) {
yann@1: 		case KEY_LEFT:
yann@1: 		case TAB:
yann@1: 		case KEY_RIGHT:
yann@1: 			button = ((key == KEY_LEFT ? --button : ++button) < 0)
yann@1: 			    ? 2 : (button > 2 ? 0 : button);
yann@1: 
yann@1: 			print_buttons(dialog, height, width, button);
yann@1: 			wrefresh(menu);
yann@1: 			break;
yann@1: 		case ' ':
yann@1: 		case 's':
yann@1: 		case 'y':
yann@1: 		case 'n':
yann@1: 		case 'm':
yann@1: 		case '/':
yann@1: 			/* save scroll info */
yann@1: 			*s_scroll = scroll;
yann@1: 			delwin(menu);
yann@1: 			delwin(dialog);
yann@1: 			item_set(scroll + choice);
yann@1: 			item_set_selected(1);
yann@1: 			switch (key) {
yann@1: 			case 's':
yann@1: 				return 3;
yann@1: 			case 'y':
yann@1: 				return 3;
yann@1: 			case 'n':
yann@1: 				return 4;
yann@1: 			case 'm':
yann@1: 				return 5;
yann@1: 			case ' ':
yann@1: 				return 6;
yann@1: 			case '/':
yann@1: 				return 7;
yann@1: 			}
yann@1: 			return 0;
yann@1: 		case 'h':
yann@1: 		case '?':
yann@1: 			button = 2;
yann@1: 		case '\n':
yann@1: 			*s_scroll = scroll;
yann@1: 			delwin(menu);
yann@1: 			delwin(dialog);
yann@1: 			item_set(scroll + choice);
yann@1: 			item_set_selected(1);
yann@1: 			return button;
yann@1: 		case 'e':
yann@1: 		case 'x':
yann@1: 			key = KEY_ESC;
yann@1: 			break;
yann@1: 		case KEY_ESC:
yann@1: 			key = on_key_esc(menu);
yann@1: 			break;
yann@1: 		case KEY_RESIZE:
yann@1: 			on_key_resize();
yann@1: 			delwin(menu);
yann@1: 			delwin(dialog);
yann@1: 			goto do_resize;
yann@1: 		}
yann@1: 	}
yann@1: 	delwin(menu);
yann@1: 	delwin(dialog);
yann@1: 	return key;		/* ESC pressed */
yann@1: }