root/lxdialog/checklist.c

/*
 *  checklist.c -- implements the checklist box
 *
 *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
 *     Stuart Herbert - S.Herbert@sheffield.ac.uk: radiolist extension
 *     Alessandro Rubini - rubini@ipvvis.unipv.it: merged the two
 *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "dialog.h"

static int list_width, check_x, item_x, checkflag;

/*
 * Print list item
 */
static void
print_item (WINDOW * win, const char *item, int status,
            int choice, int selected)
{
    int i;

    /* Clear 'residue' of last item */
    wattrset (win, menubox_attr);
    wmove (win, choice, 0);
    for (i = 0; i < list_width; i++)
        waddch (win, ' ');

    wmove (win, choice, check_x);
    wattrset (win, selected ? check_selected_attr : check_attr);
    if (checkflag == FLAG_CHECK)
        wprintw (win, "[%c]", status ? 'X' : ' ');
    else
        wprintw (win, "(%c)", status ? 'X' : ' ');

    wattrset (win, selected ? tag_selected_attr : tag_attr);
    mvwaddch(win, choice, item_x, item[0]);
    wattrset (win, selected ? item_selected_attr : item_attr);
    waddstr (win, (char *)item+1);
    if (selected) {
        wmove (win, choice, check_x+1);
        wrefresh (win);
    }
}

/*
 * Print the scroll indicators.
 */
static void
print_arrows (WINDOW * win, int choice, int item_no, int scroll,
                int y, int x, int height)
{
    wmove(win, y, x);

    if (scroll > 0) {
        wattrset (win, uarrow_attr);
        waddch (win, ACS_UARROW);
        waddstr (win, "(-)");
    }
    else {
        wattrset (win, menubox_attr);
        waddch (win, ACS_HLINE);
        waddch (win, ACS_HLINE);
        waddch (win, ACS_HLINE);
        waddch (win, ACS_HLINE);
    }

   y = y + height + 1;
   wmove(win, y, x);

   if ((height < item_no) && (scroll + choice < item_no - 1)) {
        wattrset (win, darrow_attr);
        waddch (win, ACS_DARROW);
        waddstr (win, "(+)");
    }
    else {
        wattrset (win, menubox_border_attr);
        waddch (win, ACS_HLINE);
        waddch (win, ACS_HLINE);
        waddch (win, ACS_HLINE);
        waddch (win, ACS_HLINE);
   }
}

/*
 *  Display the termination buttons
 */
static void
print_buttons( WINDOW *dialog, int height, int width, int selected)
{
    int x = width / 2 - 11;
    int y = height - 2;

    print_button (dialog, "Select", y, x, selected == 0);
    print_button (dialog, " Help ", y, x + 14, selected == 1);

    wmove(dialog, y, x+1 + 14*selected);
    wrefresh (dialog);
}

/*
 * Display a dialog box with a list of options that can be turned on or off
 * The `flag' parameter is used to select between radiolist and checklist.
 */
int
dialog_checklist (const char *title, const char *prompt, int height, int width,
        int list_height, int item_no, const char * const * items, int flag)
        
{
    int i, x, y, box_x, box_y;
    int key = 0, button = 0, choice = 0, scroll = 0, max_choice, *status;
    WINDOW *dialog, *list;

    checkflag = flag;

    /* Allocate space for storing item on/off status */
    if ((status = malloc (sizeof (int) * item_no)) == NULL) {
        endwin ();
        fprintf (stderr,
                 "\nCan't allocate memory in dialog_checklist().\n");
        exit (-1);
    }

    /* Initializes status */
    for (i = 0; i < item_no; i++) {
        status[i] = !strcasecmp (items[i * 3 + 2], "on");
        if (!choice && status[i])
            choice = i;
    }

    max_choice = MIN (list_height, item_no);

    /* center dialog box on screen */
    x = (COLS - width) / 2;
    y = (LINES - 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, dialog_attr, border_attr);
    wattrset (dialog, border_attr);
    mvwaddch (dialog, height-3, 0, ACS_LTEE);
    for (i = 0; i < width - 2; i++)
        waddch (dialog, ACS_HLINE);
    wattrset (dialog, dialog_attr);
    waddch (dialog, ACS_RTEE);

    if (title != NULL && strlen(title) >= width-2 ) {
        /* truncate long title -- mec */
        char * title2 = malloc(width-2+1);
        memcpy( title2, title, width-2 );
        title2[width-2] = '\0';
        title = title2;
    }

    if (title != NULL) {
        wattrset (dialog, title_attr);
        mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
        waddstr (dialog, (char *)title);
        waddch (dialog, ' ');
    }

    wattrset (dialog, dialog_attr);
    print_autowrap (dialog, prompt, width - 2, 1, 3);

    list_width = width - 6;
    box_y = height - list_height - 5;
    box_x = (width - list_width) / 2 - 1;

    /* create new window for the list */
    list = subwin (dialog, list_height, list_width, y+box_y+1, x+box_x+1);

    keypad (list, TRUE);

    /* draw a box around the list items */
    draw_box (dialog, box_y, box_x, list_height + 2, list_width + 2,
              menubox_border_attr, menubox_attr);

    /* Find length of longest item in order to center checklist */
    check_x = 0;
    for (i = 0; i < item_no; i++) 
        check_x = MAX (check_x, + strlen (items[i * 3 + 1]) + 4);

    check_x = (list_width - check_x) / 2;
    item_x = check_x + 4;

    if (choice >= list_height) {
        scroll = choice - list_height + 1;
        choice -= scroll;
    }

    /* Print the list */
    for (i = 0; i < max_choice; i++) {
        print_item (list, items[(scroll+i) * 3 + 1],
                    status[i+scroll], i, i == choice);
    }

    print_arrows(dialog, choice, item_no, scroll,
                        box_y, box_x + check_x + 5, list_height);

    print_buttons(dialog, height, width, 0);

    wnoutrefresh (list);
    wnoutrefresh (dialog);
    doupdate ();

    while (key != ESC) {
        key = wgetch (dialog);

        for (i = 0; i < max_choice; i++)
            if (toupper(key) == toupper(items[(scroll+i)*3+1][0]))
                break;


        if ( i < max_choice || key == KEY_UP || key == KEY_DOWN || 
            key == '+' || key == '-' ) {
            if (key == KEY_UP || key == '-') {
                if (!choice) {
                    if (!scroll)
                        continue;
                    /* Scroll list down */
                    if (list_height > 1) {
                        /* De-highlight current first item */
                        print_item (list, items[scroll * 3 + 1],
                                        status[scroll], 0, FALSE);
                        scrollok (list, TRUE);
                        wscrl (list, -1);
                        scrollok (list, FALSE);
                    }
                    scroll--;
                    print_item (list, items[scroll * 3 + 1],
                                status[scroll], 0, TRUE);
                    wnoutrefresh (list);

                    print_arrows(dialog, choice, item_no, scroll,
                                box_y, box_x + check_x + 5, list_height);

                    wrefresh (dialog);

                    continue;   /* wait for another key press */
                } else
                    i = choice - 1;
            } else if (key == KEY_DOWN || key == '+') {
                if (choice == max_choice - 1) {
                    if (scroll + choice >= item_no - 1)
                        continue;
                    /* Scroll list up */
                    if (list_height > 1) {
                        /* De-highlight current last item before scrolling up */
                        print_item (list, items[(scroll + max_choice - 1) * 3 + 1],
                                    status[scroll + max_choice - 1],
                                    max_choice - 1, FALSE);
                        scrollok (list, TRUE);
                        scroll (list);
                        scrollok (list, FALSE);
                    }
                    scroll++;
                    print_item (list, items[(scroll + max_choice - 1) * 3 + 1],
                                status[scroll + max_choice - 1],
                                max_choice - 1, TRUE);
                    wnoutrefresh (list);

                    print_arrows(dialog, choice, item_no, scroll,
                                box_y, box_x + check_x + 5, list_height);

                    wrefresh (dialog);

                    continue;   /* wait for another key press */
                } else
                    i = choice + 1;
            }
            if (i != choice) {
                /* De-highlight current item */
                print_item (list, items[(scroll + choice) * 3 + 1],
                            status[scroll + choice], choice, FALSE);
                /* Highlight new item */
                choice = i;
                print_item (list, items[(scroll + choice) * 3 + 1],
                            status[scroll + choice], choice, TRUE);
                wnoutrefresh (list);
                wrefresh (dialog);
            }
            continue;           /* wait for another key press */
        }
        switch (key) {
        case 'H':
        case 'h':
        case '?':
            delwin (dialog);
            free (status);
            return 1;
        case TAB:
        case KEY_LEFT:
        case KEY_RIGHT:
            button = ((key == KEY_LEFT ? --button : ++button) < 0)
                        ? 1 : (button > 1 ? 0 : button);

            print_buttons(dialog, height, width, button);
            wrefresh (dialog);
            break;
        case 'S':
        case 's':
        case ' ':
        case '\n':
            if (!button) {
                if (flag == FLAG_CHECK) {
                    status[scroll + choice] = !status[scroll + choice];
                    wmove (list, choice, check_x);
                    wattrset (list, check_selected_attr);
                    wprintw (list, "[%c]", status[scroll + choice] ? 'X' : ' ');
                } else {
                    if (!status[scroll + choice]) {
                        for (i = 0; i < item_no; i++)
                            status[i] = 0;
                        status[scroll + choice] = 1;
                        for (i = 0; i < max_choice; i++)
                            print_item (list, items[(scroll + i) * 3 + 1],
                                        status[scroll + i], i, i == choice);
                    }
                }
                wnoutrefresh (list);
                wrefresh (dialog);
            
                for (i = 0; i < item_no; i++) {
                    if (status[i]) {
                        if (flag == FLAG_CHECK) {
                            fprintf (stderr, "\"%s\" ", items[i * 3]);
                        } else {
                            fprintf (stderr, "%s", items[i * 3]);
                        }

                    }
                }
            }
            delwin (dialog);
            free (status);
            return button;
        case 'X':
        case 'x':
            key = ESC;
        case ESC:
            break;
        }

        /* Now, update everything... */
        doupdate ();
    }
    

    delwin (dialog);
    free (status);
    return -1;                  /* ESC pressed */
}