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checklist.c

/*
 *  checklist.c -- implements the checklist box
 *
 *  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
 *
 *  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 *tag, 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, menubox_attr);
    waddch (win, ' ');
    wattrset (win, selected ? tag_key_selected_attr : tag_key_attr);
    waddch (win, tag[0]);
    wattrset (win, selected ? tag_selected_attr : tag_attr);
    waddstr (win, tag + 1);
    wmove (win, choice, item_x);
    wattrset (win, selected ? item_selected_attr : item_attr);
    waddstr (win, item);
}

/*
 * 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 separate_output)
{
    int i, x, y, cur_x, cur_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");

    max_choice = MIN (list_height, item_no);

    /* center dialog box on screen */
    x = (COLS - width) / 2;
    y = (LINES - height) / 2;

#ifdef HAVE_LIBNCURSES
    if (use_shadow)
      draw_shadow (stdscr, y, x, height, width);
#endif
    dialog = newwin (height, width, y, x);
    mouse_setbase (x, y);
    keypad (dialog, TRUE);

    draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);
    wattrset (dialog, border_attr);
    wmove (dialog, height - 3, 0);
    waddch (dialog, ACS_LTEE);
    for (i = 0; i < width - 2; i++)
      waddch (dialog, ACS_HLINE);
    wattrset (dialog, dialog_attr);
    waddch (dialog, ACS_RTEE);
    wmove (dialog, height - 2, 1);
    for (i = 0; i < width - 2; i++)
      waddch (dialog, ' ');

    if (title != NULL) {
      wattrset (dialog, title_attr);
      wmove (dialog, 0, (width - strlen (title)) / 2 - 1);
      waddch (dialog, ' ');
      waddstr (dialog, title);
      waddch (dialog, ' ');
    }
    wattrset (dialog, dialog_attr);
    print_autowrap (dialog, prompt, width - 2, 1, 3);

    list_width = width - 6;
    getyx (dialog, cur_y, cur_x);
    box_y = cur_y + 1;
    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);

    check_x = 0;
    item_x = 0;
    /* Find length of longest item in order to center checklist */
    for (i = 0; i < item_no; i++) {
      check_x = MAX (check_x, strlen (items[i * 3])
                   + strlen (items[i * 3 + 1]) + 6);
      item_x = MAX (item_x, strlen (items[i * 3]));
    }
    check_x = (list_width - check_x) / 2;
    item_x = check_x + item_x + 6;

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

    /* register the new window, along with its borders */
    mouse_mkbigregion (box_y, box_x, list_height + 2, list_width + 2,
                 item_no, item_x /* the threshold */ , 0 /* normal */ );

    if (list_height < item_no) {
      wattrset (dialog, darrow_attr);
      wmove (dialog, box_y + list_height + 1, box_x + check_x + 5);
      waddch (dialog, ACS_DARROW);
      wmove (dialog, box_y + list_height + 1, box_x + check_x + 6);
      waddstr (dialog, "(+)");
    }
    x = width / 2 - 11;
    y = height - 2;
    print_button (dialog, "Cancel", y, x + 14, FALSE);
    print_button (dialog, "  OK  ", y, x, TRUE);
    wrefresh (dialog);

    while (key != ESC) {
      key = mouse_wgetch (dialog);
      /* Check if key pressed matches first character of
         any item tag in list */
      for (i = 0; i < max_choice; i++)
          if (toupper (key) ==
            toupper (items[(scroll + i) * 3][0]))
            break;

      if (i < max_choice ||
          (key >= '1' && key <= MIN ('9', '0' + max_choice)) ||
          key == KEY_UP || key == KEY_DOWN || key == ' ' ||
          key == '+' || key == '-' ||
          (key >= M_EVENT && key - M_EVENT < ' ')) {
          if (key >= '1' && key <= MIN ('9', '0' + max_choice))
            i = key - '1';
          else if (key == KEY_UP || key == '-') {
            if (!choice) {
                if (!scroll)
                  continue;
                /* Scroll list down */
                getyx (dialog, cur_y, cur_x);
                if (list_height > 1) {
                  /* De-highlight current first item */
                  print_item (list, items[scroll * 3],
                            items[scroll * 3 + 1], status[scroll],
                            0, FALSE);
                  scrollok (list, TRUE);
                  wscrl (list, -1);
                  scrollok (list, FALSE);
                }
                scroll--;
                print_item (list, items[scroll * 3],
                        items[scroll * 3 + 1],
                        status[scroll], 0, TRUE);
                wnoutrefresh (list);

                /* print the up/down arrows */
                wmove (dialog, box_y, box_x + check_x + 5);
                wattrset (dialog, scroll ? uarrow_attr : menubox_attr);
                waddch (dialog, scroll ? ACS_UARROW : ACS_HLINE);
                wmove (dialog, box_y, box_x + check_x + 6);
                waddch (dialog, scroll ? '(' : ACS_HLINE);
                wmove (dialog, box_y, box_x + check_x + 7);
                waddch (dialog, scroll ? '-' : ACS_HLINE);
                wmove (dialog, box_y, box_x + check_x + 8);
                waddch (dialog, scroll ? ')' : ACS_HLINE);
                wattrset (dialog, darrow_attr);
                wmove (dialog, box_y + list_height + 1,
                     box_x + check_x + 5);
                waddch (dialog, ACS_DARROW);
                wmove (dialog, box_y + list_height + 1,
                     box_x + check_x + 6);
                waddch (dialog, '(');
                wmove (dialog, box_y + list_height + 1,
                     box_x + check_x + 7);
                waddch (dialog, '+');
                wmove (dialog, box_y + list_height + 1,
                     box_x + check_x + 8);
                waddch (dialog, ')');
                wmove (dialog, cur_y, cur_x);
                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 */
                getyx (dialog, cur_y, cur_x);
                if (list_height > 1) {
                  /* De-highlight current last item before scrolling up */
                  print_item (list, items[(scroll + max_choice - 1) * 3],
                            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],
                        items[(scroll + max_choice - 1) * 3 + 1],
                        status[scroll + max_choice - 1],
                        max_choice - 1, TRUE);
                wnoutrefresh (list);

                /* print the up/down arrows */
                wattrset (dialog, uarrow_attr);
                wmove (dialog, box_y, box_x + check_x + 5);
                waddch (dialog, ACS_UARROW);
                wmove (dialog, box_y, box_x + check_x + 6);
                waddstr (dialog, "(-)");
                wmove (dialog, box_y + list_height + 1,
                     box_x + check_x + 5);
                wattrset (dialog, scroll + choice < item_no - 1 ?
                        darrow_attr : menubox_border_attr);
                waddch (dialog, scroll + choice < item_no - 1 ?
                      ACS_DARROW : ACS_HLINE);
                wmove (dialog, box_y + list_height + 1,
                     box_x + check_x + 6);
                waddch (dialog, scroll + choice < item_no - 1 ?
                      '(' : ACS_HLINE);
                wmove (dialog, box_y + list_height + 1,
                     box_x + check_x + 7);
                waddch (dialog, scroll + choice < item_no - 1 ?
                      '+' : ACS_HLINE);
                wmove (dialog, box_y + list_height + 1,
                     box_x + check_x + 8);
                waddch (dialog, scroll + choice < item_no - 1 ?
                      ')' : ACS_HLINE);
                wmove (dialog, cur_y, cur_x);
                wrefresh (dialog);
                continue;     /* wait for another key press */
            } else
                i = choice + 1;
          } else if (key == ' ') {  /* Toggle item status */
            if (flag == FLAG_CHECK) {
                status[scroll + choice] = !status[scroll + choice];
                getyx (dialog, cur_y, cur_x);
                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;
                  getyx (dialog, cur_y, cur_x);
                  for (i = 0; i < max_choice; i++)
                      print_item (list, items[(scroll + i) * 3],
                              items[(scroll + i) * 3 + 1],
                              status[scroll + i], i, i == choice);
                }
            }
            wnoutrefresh (list);
            wmove (dialog, cur_y, cur_x);
            wrefresh (dialog);
            continue;   /* wait for another key press */
          }
          if (i != choice) {
            /* De-highlight current item */
            getyx (dialog, cur_y, cur_x);
            print_item (list, items[(scroll + choice) * 3],
                      items[(scroll + choice) * 3 + 1],
                      status[scroll + choice], choice, FALSE);
            /* Highlight new item */
            choice = i;
            print_item (list, items[(scroll + choice) * 3],
                      items[(scroll + choice) * 3 + 1],
                      status[scroll + choice], choice, TRUE);
            wnoutrefresh (list);
            wmove (dialog, cur_y, cur_x);
            wrefresh (dialog);
          }
          continue;           /* wait for another key press */
      }
      switch (key) {
      case 'O':
      case 'o':
      case M_EVENT + 'O':
          delwin (dialog);
          for (i = 0; i < item_no; i++)
            if (status[i]) {
                if (flag == FLAG_CHECK) {
                  if (separate_output) {
                      fprintf (stderr, "%s\n", items[i * 3]);
                  } else {
                      fprintf (stderr, "\"%s\" ", items[i * 3]);
                  }
                } else {
                  fprintf (stderr, "%s", items[i * 3]);
                }

            }
          free (status);
          return 0;
      case 'C':
      case 'c':
      case M_EVENT + 'C':
          delwin (dialog);
          free (status);
          return 1;
          return 1;
      case M_EVENT + 'o':     /* mouse enter... */
      case M_EVENT + 'c':     /* use the code for toggling */
          button = (key == M_EVENT + 'o');
      case TAB:
      case KEY_LEFT:
      case KEY_RIGHT:
          if (!button) {
            button = 1; /* "Cancel" button selected */
            print_button (dialog, "  OK  ", y, x, FALSE);
            print_button (dialog, "Cancel", y, x + 14, TRUE);
          } else {
            button = 0; /* "OK" button selected */
            print_button (dialog, "Cancel", y, x + 14, FALSE);
            print_button (dialog, "  OK  ", y, x, TRUE);
          }
          wrefresh (dialog);
          break;
      case ' ':
      case '\n':
          delwin (dialog);
          if (!button)
            for (i = 0; i < item_no; i++)
                if (status[i]) {
                  if (flag == FLAG_CHECK) {
                      if (separate_output) {
                        fprintf (stderr, "%s\n", items[i * 3]);
                      } else {
                        fprintf (stderr, "\"%s\" ", items[i * 3]);
                      }
                  } else {
                      fprintf (stderr, "%s", items[i * 3]);
                  }

                }
          free (status);
          return button;
      case ESC:
          break;
      }
    }

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

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