Curses::Widgets::ListBox - List Box Widgets

$Id: ListBox.pm,v 1.104 2002/11/14 01:20:28 corliss Exp corliss $

  use Curses::Widgets::ListBox;

  $lb = Curses::Widgets::ListBox->new({
    CAPTION     => 'List',
    CAPTIONCOL  => 'yellow',
    COLUMNS     => 10,
    LINES       => 3,
    VALUE       => 0,
    INPUTFUNC   => \&scankey,
    FOREGROUND  => 'white',
    BACKGROUND  => 'black',
    SELECTEDCOL => 'green',
    BORDER      => 1,
    BORDERCOL   => 'red',
    FOCUSSWITCH => "\t",
    X           => 1,
    Y           => 1,
    TOPELEMENT  => 0,
    LISTITEMS   => [@list],
    });

  $lb->draw($mwh, 1);

  See the Curses::Widgets pod for other methods.

Curses

Curses::Widgets

Curses::Widgets::ListBox provides simplified OO access to Curses-based single/multi-select list boxes. Each object maintains its own state information.

  $tm = Curses::Widgets::ListBox->new({
    CAPTION     => 'List',
    CAPTIONCOL  => 'yellow',
    COLUMNS     => 10,
    LINES       => 3,
    VALUE       => 0,
    INPUTFUNC   => \&scankey,
    FOREGROUND  => 'white',
    BACKGROUND  => 'black',
    SELECTEDCOL => 'green',
    BORDER      => 1,
    BORDERCOL   => 'red',
    FOCUSSWITCH => "\t",
    X           => 1,
    Y           => 1,
    TOPELEMENT  => 0,
    LISTITEMS   => [@list],
    });

The new method instantiates a new ListBox object. The only mandatory key/value pairs in the configuration hash are X and Y. All others have the following defaults:

  Key           Default   Description
  ============================================================
  CAPTION         undef   Caption superimposed on border
  CAPTIONCOL      undef   Foreground colour for caption text
  COLUMNS            10   Number of columns displayed
  LINES               3   Number of lines in the window
  INPUTFUNC   \&scankey   Function to use to scan for keystrokes
  FOREGROUND      undef   Default foreground colour
  BACKGROUND      undef   Default background colour
  SELECTEDCOL     undef   Default colour of selected items
  BORDER              1   Display a border around the field
  BORDERCOL       undef   Foreground colour for border
  FOCUSSWITCH      "\t"   Characters which signify end of input
  TOPELEMENT          0   Index of element displayed on line 1
  LISTITEMS          []   List of list items
  MULTISEL            0   Whether or not multiple items can be 
                          selected
  TOGGLE         "\n\s"   What input toggles selection of the 
                          current item
  VALUE         0 or []   Index(es) of selected items
  CURSORPOS           0   Index of the item the cursor is 
                          currently on

The CAPTION is only valid when the BORDER is enabled. If the border is disabled, the field will be underlined, provided the terminal supports it.

The value of VALUE should be an array reference when in multiple selection mode. Otherwise it should either undef or an integer.

  $lb->draw($mwh, 1);

The draw method renders the list box in its current state. This requires a valid handle to a curses window in which it will render itself. The optional second argument, if true, will cause the field's text cursor to be rendered as well.

1999/12/29 Original list box widget in functional model

2001/07/05 First incarnation in OO architecture

(c) 2001 Arthur Corliss (corliss@digitalmages.com)