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444 lines
12 KiB
C
444 lines
12 KiB
C
/*
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* menubox.c -- implements the menu box
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*
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* ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
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* MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* Changes by Clifford Wolf (god@clifford.at)
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*
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* [ 1998-06-13 ]
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*
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* *) A bugfix for the Page-Down problem
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*
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* *) Formerly when I used Page Down and Page Up, the cursor would be set
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* to the first position in the menu box. Now lxdialog is a bit
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* smarter and works more like other menu systems (just have a look at
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* it).
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*
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* *) Formerly if I selected something my scrolling would be broken because
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* lxdialog is re-invoked by the Menuconfig shell script, can't
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* remember the last scrolling position, and just sets it so that the
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* cursor is at the bottom of the box. Now it writes the temporary file
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* lxdialog.scrltmp which contains this information. The file is
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* deleted by lxdialog if the user leaves a submenu or enters a new
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* one, but it would be nice if Menuconfig could make another "rm -f"
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* just to be sure. Just try it out - you will recognise a difference!
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*
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* [ 1998-06-14 ]
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*
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* *) Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
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* and menus change their size on the fly.
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*
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* *) If for some reason the last scrolling position is not saved by
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* lxdialog, it sets the scrolling so that the selected item is in the
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* middle of the menu box, not at the bottom.
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*
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* 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)
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* Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus.
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* This fixes a bug in Menuconfig where using ' ' to descend into menus
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* would leave mis-synchronized lxdialog.scrltmp files lying around,
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* fscanf would read in 'scroll', and eventually that value would get used.
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*/
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#include "dialog.h"
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static int menu_width, item_x;
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/*
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* Print menu item
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*/
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static void
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print_item (WINDOW * win, const char *item, int choice, int selected, int hotkey)
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{
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int j;
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char menu_item[menu_width+1];
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strncpy(menu_item, item, menu_width);
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menu_item[menu_width] = 0;
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j = first_alpha(menu_item, "YyNnMm");
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/* Clear 'residue' of last item */
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wattrset (win, menubox_attr);
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wmove (win, choice, 0);
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#if OLD_NCURSES
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{
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int i;
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for (i = 0; i < menu_width; i++)
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waddch (win, ' ');
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}
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#else
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wclrtoeol(win);
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#endif
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wattrset (win, selected ? item_selected_attr : item_attr);
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mvwaddstr (win, choice, item_x, menu_item);
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if (hotkey) {
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wattrset (win, selected ? tag_key_selected_attr : tag_key_attr);
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mvwaddch(win, choice, item_x+j, menu_item[j]);
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}
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if (selected) {
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wmove (win, choice, item_x+1);
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wrefresh (win);
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}
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}
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/*
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* Print the scroll indicators.
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*/
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static void
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print_arrows (WINDOW * win, int item_no, int scroll,
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int y, int x, int height)
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{
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int cur_y, cur_x;
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getyx(win, cur_y, cur_x);
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wmove(win, y, x);
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if (scroll > 0) {
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wattrset (win, uarrow_attr);
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waddch (win, ACS_UARROW);
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waddstr (win, "(-)");
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}
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else {
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wattrset (win, menubox_attr);
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waddch (win, ACS_HLINE);
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waddch (win, ACS_HLINE);
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waddch (win, ACS_HLINE);
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waddch (win, ACS_HLINE);
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}
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y = y + height + 1;
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wmove(win, y, x);
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if ((height < item_no) && (scroll + height < item_no)) {
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wattrset (win, darrow_attr);
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waddch (win, ACS_DARROW);
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waddstr (win, "(+)");
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}
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else {
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wattrset (win, menubox_border_attr);
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waddch (win, ACS_HLINE);
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waddch (win, ACS_HLINE);
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waddch (win, ACS_HLINE);
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waddch (win, ACS_HLINE);
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}
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wmove(win, cur_y, cur_x);
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}
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/*
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* Display the termination buttons.
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*/
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static void
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print_buttons (WINDOW *win, int height, int width, int selected)
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{
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int x = width / 2 - 16;
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int y = height - 2;
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print_button (win, "Select", y, x, selected == 0);
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print_button (win, " Exit ", y, x + 12, selected == 1);
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print_button (win, " Help ", y, x + 24, selected == 2);
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wmove(win, y, x+1+12*selected);
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wrefresh (win);
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}
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/*
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* Display a menu for choosing among a number of options
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*/
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int
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dialog_menu (const char *title, const char *prompt, int height, int width,
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int menu_height, const char *current, int item_no,
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const char * const * items)
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{
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int i, j, x, y, box_x, box_y;
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int key = 0, button = 0, scroll = 0, choice = 0, first_item = 0, max_choice;
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WINDOW *dialog, *menu;
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FILE *f;
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max_choice = MIN (menu_height, item_no);
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/* center dialog box on screen */
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x = (COLS - width) / 2;
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y = (LINES - height) / 2;
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draw_shadow (stdscr, y, x, height, width);
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dialog = newwin (height, width, y, x);
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keypad (dialog, TRUE);
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draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);
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wattrset (dialog, border_attr);
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mvwaddch (dialog, height - 3, 0, ACS_LTEE);
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for (i = 0; i < width - 2; i++)
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waddch (dialog, ACS_HLINE);
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wattrset (dialog, dialog_attr);
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wbkgdset (dialog, dialog_attr & A_COLOR);
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waddch (dialog, ACS_RTEE);
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if (title != NULL && strlen(title) >= width-2 ) {
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/* truncate long title -- mec */
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char * title2 = malloc(width-2+1);
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memcpy( title2, title, width-2 );
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title2[width-2] = '\0';
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title = title2;
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}
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if (title != NULL) {
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wattrset (dialog, title_attr);
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mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
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waddstr (dialog, (char *)title);
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waddch (dialog, ' ');
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}
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wattrset (dialog, dialog_attr);
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print_autowrap (dialog, prompt, width - 2, 1, 3);
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menu_width = width - 6;
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box_y = height - menu_height - 5;
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box_x = (width - menu_width) / 2 - 1;
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/* create new window for the menu */
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menu = subwin (dialog, menu_height, menu_width,
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y + box_y + 1, x + box_x + 1);
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keypad (menu, TRUE);
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/* draw a box around the menu items */
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draw_box (dialog, box_y, box_x, menu_height + 2, menu_width + 2,
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menubox_border_attr, menubox_attr);
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/*
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* Find length of longest item in order to center menu.
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* Set 'choice' to default item.
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*/
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item_x = 0;
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for (i = 0; i < item_no; i++) {
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item_x = MAX (item_x, MIN(menu_width, strlen (items[i * 2 + 1]) + 2));
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if (strcmp(current, items[i*2]) == 0) choice = i;
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}
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item_x = (menu_width - item_x) / 2;
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/* get the scroll info from the temp file */
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if ( (f=fopen("lxdialog.scrltmp","r")) != NULL ) {
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if ( (fscanf(f,"%d\n",&scroll) == 1) && (scroll <= choice) &&
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(scroll+max_choice > choice) && (scroll >= 0) &&
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(scroll+max_choice <= item_no) ) {
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first_item = scroll;
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choice = choice - scroll;
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fclose(f);
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} else {
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scroll=0;
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remove("lxdialog.scrltmp");
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fclose(f);
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f=NULL;
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}
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}
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if ( (choice >= max_choice) || (f==NULL && choice >= max_choice/2) ) {
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if (choice >= item_no-max_choice/2)
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scroll = first_item = item_no-max_choice;
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else
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scroll = first_item = choice - max_choice/2;
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choice = choice - scroll;
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}
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/* Print the menu */
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for (i=0; i < max_choice; i++) {
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print_item (menu, items[(first_item + i) * 2 + 1], i, i == choice,
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(items[(first_item + i)*2][0] != ':'));
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}
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wnoutrefresh (menu);
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print_arrows(dialog, item_no, scroll,
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box_y, box_x+item_x+1, menu_height);
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print_buttons (dialog, height, width, 0);
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wmove (menu, choice, item_x+1);
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wrefresh (menu);
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while (key != ESC) {
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key = wgetch(menu);
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if (key < 256 && isalpha(key)) key = tolower(key);
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if (strchr("ynm", key))
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i = max_choice;
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else {
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for (i = choice+1; i < max_choice; i++) {
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j = first_alpha(items[(scroll+i)*2+1], "YyNnMm");
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if (key == tolower(items[(scroll+i)*2+1][j]))
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break;
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}
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if (i == max_choice)
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for (i = 0; i < max_choice; i++) {
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j = first_alpha(items[(scroll+i)*2+1], "YyNnMm");
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if (key == tolower(items[(scroll+i)*2+1][j]))
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break;
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}
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}
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if (i < max_choice ||
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key == KEY_UP || key == KEY_DOWN ||
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key == '-' || key == '+' ||
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key == KEY_PPAGE || key == KEY_NPAGE) {
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print_item (menu, items[(scroll+choice)*2+1], choice, FALSE,
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(items[(scroll+choice)*2][0] != ':'));
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if (key == KEY_UP || key == '-') {
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if (choice < 2 && scroll) {
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/* Scroll menu down */
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scrollok (menu, TRUE);
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wscrl (menu, -1);
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scrollok (menu, FALSE);
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scroll--;
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print_item (menu, items[scroll * 2 + 1], 0, FALSE,
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(items[scroll*2][0] != ':'));
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} else
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choice = MAX(choice - 1, 0);
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} else if (key == KEY_DOWN || key == '+') {
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print_item (menu, items[(scroll+choice)*2+1], choice, FALSE,
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(items[(scroll+choice)*2][0] != ':'));
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if ((choice > max_choice-3) &&
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(scroll + max_choice < item_no)
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) {
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/* Scroll menu up */
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scrollok (menu, TRUE);
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scroll (menu);
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scrollok (menu, FALSE);
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scroll++;
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print_item (menu, items[(scroll+max_choice-1)*2+1],
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max_choice-1, FALSE,
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(items[(scroll+max_choice-1)*2][0] != ':'));
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} else
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choice = MIN(choice+1, max_choice-1);
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} else if (key == KEY_PPAGE) {
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scrollok (menu, TRUE);
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for (i=0; (i < max_choice); i++) {
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if (scroll > 0) {
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wscrl (menu, -1);
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scroll--;
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print_item (menu, items[scroll * 2 + 1], 0, FALSE,
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(items[scroll*2][0] != ':'));
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} else {
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if (choice > 0)
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choice--;
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}
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}
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scrollok (menu, FALSE);
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} else if (key == KEY_NPAGE) {
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for (i=0; (i < max_choice); i++) {
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if (scroll+max_choice < item_no) {
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scrollok (menu, TRUE);
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scroll(menu);
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scrollok (menu, FALSE);
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scroll++;
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print_item (menu, items[(scroll+max_choice-1)*2+1],
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max_choice-1, FALSE,
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(items[(scroll+max_choice-1)*2][0] != ':'));
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} else {
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if (choice+1 < max_choice)
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choice++;
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}
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}
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} else
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choice = i;
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print_item (menu, items[(scroll+choice)*2+1], choice, TRUE,
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(items[(scroll+choice)*2][0] != ':'));
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print_arrows(dialog, item_no, scroll,
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box_y, box_x+item_x+1, menu_height);
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wnoutrefresh (dialog);
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wrefresh (menu);
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continue; /* wait for another key press */
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}
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switch (key) {
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case KEY_LEFT:
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case TAB:
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case KEY_RIGHT:
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button = ((key == KEY_LEFT ? --button : ++button) < 0)
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? 2 : (button > 2 ? 0 : button);
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print_buttons(dialog, height, width, button);
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wrefresh (menu);
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break;
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case ' ':
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case 's':
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case 'y':
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case 'n':
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case 'm':
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/* save scroll info */
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if ( (f=fopen("lxdialog.scrltmp","w")) != NULL ) {
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fprintf(f,"%d\n",scroll);
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fclose(f);
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}
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delwin (dialog);
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fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
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switch (key) {
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case 's': return 3;
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case 'y': return 3;
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case 'n': return 4;
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case 'm': return 5;
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case ' ': return 6;
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}
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return 0;
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case 'h':
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case '?':
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button = 2;
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case '\n':
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delwin (dialog);
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if (button == 2)
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fprintf(stderr, "%s \"%s\"\n",
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items[(scroll + choice) * 2],
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items[(scroll + choice) * 2 + 1] +
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first_alpha(items[(scroll + choice) * 2 + 1],""));
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else
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fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
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remove("lxdialog.scrltmp");
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return button;
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case 'e':
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case 'x':
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key = ESC;
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case ESC:
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break;
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}
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}
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delwin (dialog);
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remove("lxdialog.scrltmp");
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return -1; /* ESC pressed */
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}
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