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menubox.c

/*
 *  menubox.c -- implements the menu box
 *
 *  AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
 *
 *  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 menu_width, tag_x, item_x;

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

    /* Clear 'residue' of last item */
    wattrset (win, menubox_attr);
    wmove (win, choice, 0);
    for (i = 0; i < menu_width; i++)
      waddch (win, ' ');
    wmove (win, choice, tag_x);
    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 menu for choosing among a number of options
 */
int
dialog_menu (const char *title, const char *prompt, int height, int width,
            int menu_height, int item_no, const char * const * items)
{
    int i, x, y, cur_x, cur_y, box_x, box_y;
    int key = 0, button = 0, choice = 0, scroll = 0, max_choice;
    WINDOW *dialog, *menu;

    max_choice = MIN (menu_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);

    menu_width = width - 6;
    getyx (dialog, cur_y, cur_x);
    box_y = cur_y + 1;
    box_x = (width - menu_width) / 2 - 1;

    /* create new window for the menu */
    menu = subwin (dialog, menu_height, menu_width, y + box_y + 1,
               x + box_x + 1);
    keypad (menu, TRUE);

    /* draw a box around the menu items */
    draw_box (dialog, box_y, box_x, menu_height + 2, menu_width + 2,
            menubox_border_attr, menubox_attr);

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

    /* Print the menu */
    for (i = 0; i < max_choice; i++)
      print_item (menu, items[i * 2], items[i * 2 + 1],
                i, i == choice);
    wnoutrefresh (menu);

    /* register the new window, along with its borders */
    mouse_mkbigregion (box_y, box_x, menu_height + 2, menu_width + 2,
             item_no, item_x /* the threshold */ , 1 /* dirty mode */ );

    if (menu_height < item_no) {
      wattrset (dialog, darrow_attr);
      wmove (dialog, box_y + menu_height + 1, box_x + tag_x + 1);
      waddch (dialog, ACS_DARROW);
      wmove (dialog, box_y + menu_height + 1, box_x + tag_x + 2);
      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 menu */
      for (i = 0; i < max_choice; i++)
          if (toupper (key) == toupper (items[(scroll + i) * 2][0]))
            break;

      if (i < max_choice ||
          (key >= '1' && key <= MIN ('9', '0' + max_choice)) ||
          key == KEY_UP || key == KEY_DOWN || key == '-' ||
          key == '+' || (key >= M_EVENT && key - M_EVENT < ' ')) {
          if (key >= '1' && key <= MIN ('9', '0' + max_choice))
            i = key - '1';
          else if (key >= M_EVENT)
            i = key - M_EVENT;
          else if (key == KEY_UP || key == '-') {
            if (!choice) {
                if (scroll) {

                  /* Scroll menu down */
                  getyx (dialog, cur_y, cur_x);
                  if (menu_height > 1) {
                      /* De-highlight current first item */
                      print_item (menu, items[scroll * 2],
                              items[scroll * 2 + 1], 0, FALSE);
                      scrollok (menu, TRUE);
                      wscrl (menu, -1);
                      scrollok (menu, FALSE);
                  }
                  scroll--;
                  print_item (menu, items[scroll * 2],
                            items[scroll * 2 + 1], 0, TRUE);
                  wnoutrefresh (menu);

                  /* print the up/down arrows */
                  wmove (dialog, box_y, box_x + tag_x + 1);
                  wattrset (dialog, scroll ? uarrow_attr : menubox_attr);
                  waddch (dialog, scroll ? ACS_UARROW : ACS_HLINE);
                  wmove (dialog, box_y, box_x + tag_x + 2);
                  waddch (dialog, scroll ? '(' : ACS_HLINE);
                  wmove (dialog, box_y, box_x + tag_x + 3);
                  waddch (dialog, scroll ? '-' : ACS_HLINE);
                  wmove (dialog, box_y, box_x + tag_x + 4);
                  waddch (dialog, scroll ? ')' : ACS_HLINE);
                  wattrset (dialog, darrow_attr);
                  wmove (dialog, box_y + menu_height + 1,
                         box_x + tag_x + 1);
                  waddch (dialog, ACS_DARROW);
                  wmove (dialog, box_y + menu_height + 1,
                         box_x + tag_x + 2);
                  waddstr (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) {
                  /* Scroll menu up */
                  getyx (dialog, cur_y, cur_x);
                  if (menu_height > 1) {
                      /* De-highlight current last item */
                      print_item (menu, items[(scroll + max_choice - 1)
                               * 2], items[(scroll + max_choice - 1)
                                 * 2 + 1], max_choice - 1, FALSE);
                      scrollok (menu, TRUE);
                      scroll (menu);
                      scrollok (menu, FALSE);
                  }
                  scroll++;
                  print_item (menu, items[(scroll + max_choice - 1) * 2],
                            items[(scroll + max_choice - 1) * 2 + 1],
                            max_choice - 1, TRUE);
                  wnoutrefresh (menu);

                  /* print the up/down arrows */
                  wattrset (dialog, uarrow_attr);
                  wmove (dialog, box_y, box_x + tag_x + 1);
                  waddch (dialog, ACS_UARROW);
                  wmove (dialog, box_y, box_x + tag_x + 2);
                  waddstr (dialog, "(-)");
                  wmove (dialog, box_y + menu_height + 1,
                         box_x + tag_x + 1);
                  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 + menu_height + 1,
                         box_x + tag_x + 2);
                  waddch (dialog, scroll + choice < item_no - 1 ?
                        '(' : ACS_HLINE);
                  wmove (dialog, box_y + menu_height + 1,
                         box_x + tag_x + 3);
                  waddch (dialog, scroll + choice < item_no - 1 ?
                        '+' : ACS_HLINE);
                  wmove (dialog, box_y + menu_height + 1,
                         box_x + tag_x + 4);
                  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;

          if (i != choice) {
            /* De-highlight current item */
            getyx (dialog, cur_y, cur_x); /* Save cursor position */
            print_item (menu, items[(scroll + choice) * 2],
                      items[(scroll + choice) * 2 + 1], choice, FALSE);

            /* Highlight new item */
            choice = i;
            print_item (menu, items[(scroll + choice) * 2],
                      items[(scroll + choice) * 2 + 1], choice, TRUE);
            wnoutrefresh (menu);
            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);
          return scroll + choice;
      case 'C':
      case 'c':
      case M_EVENT + 'C':
          delwin (dialog);
          return -2;
      case M_EVENT + 'o':     /* mouse enter... */
      case M_EVENT + 'c':     /* use the code for toggling */
          button = (key == M_EVENT + 'o');
      case ' ':
      case TAB:
      case KEY_LEFT:
      case KEY_RIGHT:
          if (!button) {
            button = 1; /* Indicates "Cancel" button is selected */
            print_button (dialog, "  OK  ", y, x, FALSE);
            print_button (dialog, "Cancel", y, x + 14, TRUE);
          } else {
            button = 0; /* Indicates "OK" button is selected */
            print_button (dialog, "Cancel", y, x + 14, FALSE);
            print_button (dialog, "  OK  ", y, x, TRUE);
          }
          wrefresh (dialog);
          break;
      case '\n':
          delwin (dialog);
          return (button? -2 : (scroll + choice));
      case ESC:
          break;
      }
    }

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

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