Class StringTparOption

widget_list -- list of flow widgets or list of box widgets
dividechars -- blank characters between columns
focus_column -- index into widget_list of column in focus,
    if None the first selectable widget will be chosen.
min_width -- minimum width for each column before it is hidden
box_columns -- a list of column indexes containing box widgets
    whose maxrow is set to the maximum of the rows 
    required by columns not listed in box_columns.

widget_list may also contain tuples such as:
('fixed', width, widget) give this column a fixed width
('weight', weight, widget) give this column a relative weight

widgets not in a tuple are the same as ('weight', 1, widget)    

box_columns is ignored when this widget is being used as a
box widget because in that case all columns are treated as box
widgets.

Overrides: object.__init__

(inherited documentation)

Pass keypress to the focus column.

size -- (maxcol,) if self.widget_list contains flow widgets or
    (maxcol, maxrow) if it contains box widgets.

Overrides: urwid.container.Columns.keypress

(inherited documentation)

Updates this field when changing the field focus, i.e. switching lines.