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checklist.c

/*
 *  $Id: checklist.c,v 1.1 2004/02/15 13:21:43 Tux Exp $
 *
 *  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
 *     Thomas E. Dickey - rewrote...
 *
 *  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;

#define LLEN(n) ((n) * CHECKBOX_TAGS)
#define ItemData(i)    &items[LLEN(i)]
#define ItemName(i)    items[LLEN(i)]
#define ItemText(i)    items[LLEN(i) + 1]
#define ItemStatus(i)  items[LLEN(i) + 2]
#define ItemHelp(i)    items[LLEN(i) + 3]

/*
 * Print list item
 */
static void
print_item(WINDOW *win, char **items, int status,
         int choice, int selected)
{
    int i;
    chtype attr = A_NORMAL;
    const int *indx;
    int limit;

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

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

    if (strlen(ItemName(0)) != 0) {

      indx = dlg_index_wchars(ItemName(0));
      limit = dlg_count_wchars(ItemName(0));

      wattrset(win, selected ? tag_key_selected_attr : tag_key_attr);
      (void) waddnstr(win, ItemName(0), indx[1]);

      if ((int) strlen(ItemName(0)) > indx[1]) {
          limit = dlg_limit_columns(ItemName(0), (item_x - check_x - 6), 1);
          if (limit > 1) {
            wattrset(win, selected ? tag_selected_attr : tag_attr);
            (void) waddnstr(win,
                        ItemName(0) + indx[1],
                        indx[limit] - indx[1]);
          }
      }
    }

    if (strlen(ItemText(0)) != 0) {
      indx = dlg_index_wchars(ItemText(0));
      limit = dlg_limit_columns(ItemText(0), (getmaxx(win) - item_x - 1), 0);

      if (limit > 0) {
          (void) wmove(win, choice, item_x);
          wattrset(win, selected ? item_selected_attr : item_attr);
          dlg_print_text(win, ItemText(0), indx[limit], &attr);
      }
    }

    if (selected) {
      dlg_item_help(ItemHelp(0));
    }
}

/*
 * 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 *cprompt, int height, int width,
             int list_height, int item_no, char **items, int flag,
             int separate_output)
{
    int i, j, key2, found, x, y, cur_x, cur_y, box_x, box_y;
    int key = 0, fkey;
    int button = 0;
    int choice = 0;
    int scrollamt = 0;
    int max_choice, *status;
    int use_width, name_width, text_width;
    int result = DLG_EXIT_UNKNOWN;
    WINDOW *dialog, *list;
    char *prompt = strclone(cprompt);
    const char **buttons = dlg_ok_labels();

    tab_correct_str(prompt);
    if (list_height == 0) {
      use_width = calc_listw(item_no, items, CHECKBOX_TAGS) + 10;
      /* calculate height without items (4) */
      auto_size(title, prompt, &height, &width, 4, MAX(26, use_width));
      calc_listh(&height, &list_height, item_no);
    } else {
      auto_size(title, prompt, &height, &width, 4 + list_height, 26);
    }
    print_size(height, width);
    ctl_size(height, width);

    checkflag = flag;

    /* Allocate space for storing item on/off status */
    status = malloc(sizeof(int) * item_no);
    assert_ptr(status, "dialog_checklist");

    /* Initializes status */
    for (i = 0; i < item_no; i++)
      status[i] = !dlg_strcmp(ItemStatus(i), "on");

    max_choice = MIN(list_height, item_no);

    x = box_x_ordinate(width);
    y = box_y_ordinate(height);

    dialog = new_window(height, width, y, x);

    mouse_setbase(x, y);

    draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
    draw_bottom_box(dialog);
    draw_title(dialog, title);

    wattrset(dialog, dialog_attr);
    print_autowrap(dialog, prompt, height, width);

    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 = sub_window(dialog, list_height, list_width,
                  y + box_y + 1, x + box_x + 1);

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

    text_width = 0;
    name_width = 0;
    /* Find length of longest item to center checklist */
    for (i = 0; i < item_no; i++) {
      text_width = MAX(text_width, (int) strlen(ItemText(i)));
      name_width = MAX(name_width, (int) strlen(ItemName(i)));
    }

    /* If the name+text is wider than the list is allowed, then truncate
     * one or both of them.  If the name is no wider than 1/4 of the list,
     * leave it intact.
     */
    use_width = (list_width - 6);
    if (text_width + name_width > use_width) {
      int need = 0.25 * use_width;
      if (name_width > need) {
          int want = use_width * ((double) name_width) / (text_width + name_width);
          name_width = (want > need) ? want : need;
      }
      text_width = use_width - name_width;
    }

    check_x = (use_width - (text_width + name_width)) / 2;
    item_x = name_width + check_x + 6;

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

    /* register the new window, along with its borders */
    mouse_mkbigregion(box_y + 1, box_x, list_height, list_width + 2,
                  KEY_MAX, 1, 1, 1 /* by lines */ );

    dlg_draw_arrows(dialog, scrollamt,
                scrollamt + max_choice < item_no - 1,
                box_x + check_x + 5,
                box_y,
                box_y + list_height + 1);

    dlg_draw_buttons(dialog, height - 2, 0, buttons, 0, FALSE, width);

    wtimeout(dialog, WTIMEOUT_VAL);

    while (result == DLG_EXIT_UNKNOWN) {
      key = mouse_wgetch(dialog, &fkey);

      if (fkey && (key >= (M_EVENT + KEY_MAX))) {
          getyx(dialog, cur_y, cur_x);
          /* De-highlight current item */
          print_item(list,
                   ItemData(scrollamt + choice),
                   status[scrollamt + choice], choice, FALSE);
          /* Highlight new item */
          choice = (key - (M_EVENT + KEY_MAX));
          print_item(list,
                   ItemData(scrollamt + choice),
                   status[scrollamt + choice], choice, TRUE);
          (void) wnoutrefresh(list);
          (void) wmove(dialog, cur_y, cur_x);

          key = ' ';          /* force the selected item to toggle */
          fkey = FALSE;
      }

      /*
       * A space toggles the item status.  We handle either a checklist
       * (any number of items can be selected) or radio list (zero or one
       * items can be selected).
       */
      if (key == ' ') {
          getyx(dialog, cur_y, cur_x);
          if (flag == FLAG_CHECK) { /* checklist? */
            status[scrollamt + choice] = !status[scrollamt + choice];
            print_item(list,
                     ItemData(scrollamt + choice),
                     status[scrollamt + choice], choice, TRUE);
          } else {            /* radiolist */
            if (!status[scrollamt + choice]) {
                for (i = 0; i < item_no; i++)
                  status[i] = FALSE;
                status[scrollamt + choice] = TRUE;
                for (i = 0; i < max_choice; i++)
                  print_item(list,
                           ItemData(scrollamt + i),
                           status[scrollamt + i], i, i == choice);
            }
          }
          (void) wnoutrefresh(list);
          (void) wmove(dialog, cur_y, cur_x);
          wrefresh(dialog);
          continue;           /* wait for another key press */
      } else if (key == ESC) {
          result = DLG_EXIT_ESC;
          continue;
      }

      if (!fkey) {
          fkey = TRUE;
          switch (key) {
          case '\n':
          case '\r':
            key = KEY_ENTER;
            break;
          case '-':
            key = KEY_UP;
            break;
          case '+':
            key = KEY_DOWN;
            break;
          case TAB:
            key = KEY_RIGHT;
            break;
          default:
            fkey = FALSE;
            break;
          }
      }

      /*
       * Check if key pressed matches first character of any item tag in
       * list.  If there is more than one match, we will cycle through
       * each one as the same key is pressed repeatedly.
       */
      found = FALSE;
      if (!fkey) {
          for (j = scrollamt + choice + 1; j < item_no; j++) {
            if (dlg_match_char(dlg_last_getc(), ItemName(j))) {
                found = TRUE;
                i = j - scrollamt;
                break;
            }
          }
          if (!found) {
            for (j = 0; j <= scrollamt + choice; j++) {
                if (dlg_match_char(dlg_last_getc(), ItemName(j))) {
                  found = TRUE;
                  i = j - scrollamt;
                  break;
                }
            }
          }
          if (found)
            dlg_flush_getc();
      }

      /*
       * A single digit (1-9) positions the selection to that line in the
       * current screen.
       */
      if (!found
          && (key <= '9')
          && (key > '0')
          && (key - '1' < max_choice)) {
          found = TRUE;
          i = key - '1';
      }

      if (!found) {
          if (fkey) {
            found = TRUE;
            switch (key) {
            case KEY_HOME:
                i = -scrollamt;
                break;
            case KEY_LL:
            case KEY_END:
                i = item_no - 1 - scrollamt;
                break;
            case M_EVENT + KEY_PPAGE:
            case KEY_PPAGE:
                if (choice)
                  i = 0;
                else if (scrollamt != 0)
                  i = -MIN(scrollamt, max_choice);
                else
                  continue;
                break;
            case M_EVENT + KEY_NPAGE:
            case KEY_NPAGE:
                i = MIN(choice + max_choice, item_no - scrollamt - 1);
                break;
            case KEY_UP:
                i = choice - 1;
                if (choice == 0 && scrollamt == 0)
                  continue;
                break;
            case KEY_DOWN:
                i = choice + 1;
                if (scrollamt + choice >= item_no - 1)
                  continue;
                break;
            default:
                found = FALSE;
                break;
            }
          }
      }

      if (found) {
          if (i != choice) {
            getyx(dialog, cur_y, cur_x);
            if (i < 0 || i >= max_choice) {
#if defined(NCURSES_VERSION_MAJOR) && NCURSES_VERSION_MAJOR < 5
                /*
                 * Using wscrl to assist ncurses scrolling is not needed
                 * in version 5.x
                 */
                if (i == -1) {
                  if (list_height > 1) {
                      /* De-highlight current first item */
                      print_item(list,
                               ItemData(scrollamt),
                               status[scrollamt], 0, FALSE);
                      scrollok(list, TRUE);
                      wscrl(list, -1);
                      scrollok(list, FALSE);
                  }
                  scrollamt--;
                  print_item(list,
                           ItemData(scrollamt),
                           status[scrollamt], 0, TRUE);
                } else if (i == max_choice) {
                  if (list_height > 1) {
                      /* De-highlight current last item before scrolling up */
                      print_item(list,
                               ItemData(scrollamt + max_choice - 1),
                               status[scrollamt + max_choice - 1],
                               max_choice - 1, FALSE);
                      scrollok(list, TRUE);
                      wscrl(list, 1);
                      scrollok(list, FALSE);
                  }
                  scrollamt++;
                  print_item(list,
                           ItemData(scrollamt + max_choice - 1),
                           status[scrollamt + max_choice - 1],
                           max_choice - 1, TRUE);
                } else
#endif
                {
                  if (i < 0) {
                      scrollamt += i;
                      choice = 0;
                  } else {
                      choice = max_choice - 1;
                      scrollamt += (i - max_choice + 1);
                  }
                  for (i = 0; i < max_choice; i++) {
                      print_item(list,
                               ItemData(scrollamt + i),
                               status[scrollamt + i], i, i == choice);
                  }
                }
                (void) wnoutrefresh(list);
                dlg_draw_arrows(dialog, scrollamt,
                            scrollamt + choice < item_no - 1,
                            box_x + check_x + 5,
                            box_y,
                            box_y + list_height + 1);
            } else {
                /* De-highlight current item */
                print_item(list,
                         ItemData(scrollamt + choice),
                         status[scrollamt + choice], choice, FALSE);
                /* Highlight new item */
                choice = i;
                print_item(list,
                         ItemData(scrollamt + choice),
                         status[scrollamt + choice], choice, TRUE);
                (void) wnoutrefresh(list);
                (void) wmove(dialog, cur_y, cur_x);
                wrefresh(dialog);
            }
          }
          continue;           /* wait for another key press */
      }

      if (fkey) {
          switch (key) {
          case KEY_ENTER:
            result = dlg_ok_buttoncode(button);
            break;
          case KEY_BTAB:
          case KEY_LEFT:
            button = dlg_prev_button(buttons, button);
            dlg_draw_buttons(dialog, height - 2, 0, buttons, button,
                         FALSE, width);
            break;
          case KEY_RIGHT:
            button = dlg_next_button(buttons, button);
            dlg_draw_buttons(dialog, height - 2, 0, buttons, button,
                         FALSE, width);
            break;
          default:
            if (key >= M_EVENT) {
                if ((key2 = dlg_ok_buttoncode(key - M_EVENT)) >= 0) {
                  result = key2;
                  break;
                }
                beep();
            }
          }
      } else {
          beep();
      }
    }

    del_window(dialog);
    switch (result) {
    case DLG_EXIT_OK:         /* FALLTHRU */
    case DLG_EXIT_EXTRA:
      for (i = 0; i < item_no; i++) {
          if (status[i]) {
            if (flag == FLAG_CHECK) {
                if (separate_output) {
                  dlg_add_result(ItemName(i));
                  dlg_add_result("\n");
                } else {
                  dlg_add_result("\"");
                  dlg_add_result(ItemName(i));
                  dlg_add_result("\" ");
                }
            } else {
                dlg_add_result(ItemName(i));
            }
          }
      }
      break;
    case DLG_EXIT_HELP:
      dlg_add_result("HELP ");
      if (USE_ITEM_HELP(ItemHelp(scrollamt + choice))) {
          dlg_add_result(ItemHelp(scrollamt + choice));
          result = DLG_EXIT_OK;     /* this is inconsistent */
      } else {
          dlg_add_result(ItemName(scrollamt + choice));
      }
      break;
    }
    mouse_free_regions();
    free(status);
    free(prompt);
    return result;
}

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