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       The default :meth:`.sizing` method returns this value.

    .. attribute:: _command_map
       :annotation: = urwid.command_map

       A shared :class:`CommandMap` instance. May be redefined
       in subclasses or widget instances.

    .. method:: render(size, focus=False)

       .. note::

          This method is not implemented in :class:`.Widget` but
          must be implemented by any concrete subclass

       :param size: One of the following,
                    *maxcol* and *maxrow* are integers > 0:

                    (*maxcol*, *maxrow*)
                      for box sizing -- the parent chooses the exact
                      size of this widget

                    (*maxcol*,)
                      for flow sizing -- the parent chooses only the
                      number of columns for this widget

                    ()
                      for fixed sizing -- this widget is a fixed size
                      which can't be adjusted by the parent
       :type size: widget size
       :param focus: set to ``True`` if this widget or one of its children
                     is in focus
       :type focus: bool

       :returns: A :class:`Canvas` subclass instance containing the
                 rendered content of this widget

       :class:`Text` widgets return a :class:`TextCanvas` (arbitrary text and
       display attributes), :class:`SolidFill` widgets return a
       :class:`SolidCanvas` (a single character repeated across
       the whole surface) and container widgets return a
       :class:`CompositeCanvas` (one or more other canvases
       arranged arbitrarily).

       If *focus* is ``False``, the returned canvas may not have a cursor
       position set.

       There is some metaclass magic defined in the :class:`Widget`
       metaclass :class:`WidgetMeta` that causes the
       result of this method to be cached by :class:`CanvasCache`.
       Later calls will automatically look up the value in the cache first.

       As a small optimization the class variable :attr:`ignore_focus`
       may be defined and set to ``True`` if this widget renders the same
       canvas regardless of the value of the *focus* parameter.

       Any time the content of a widget changes it should call
       :meth:`_invalidate` to remove any cached canvases, or the widget
       may render the cached canvas instead of creating a new one.


    .. method:: rows(size, focus=False)

       .. note::

          This method is not implemented in :class:`.Widget` but
          must be implemented by any flow widget.  See :meth:`.sizing`.

       See :meth:`Widget.render` for parameter details.

       :returns: The number of rows required for this widget given a number
                 of columns in *size*

       This is the method flow widgets use to communicate their size to other
       widgets without having to render a canvas. This should be a quick
       calculation as this function may be called a number of times in normal
       operation. If your implementation may take a long time you should add
       your own caching here.

       There is some metaclass magic defined in the :class:`Widget`
       metaclass :class:`WidgetMeta` that causes the
       result of this function to be retrieved from any
       canvas cached by :class:`CanvasCache`, so if your widget
       has been rendered you may not receive calls to this function. The class
       variable :attr:`ignore_focus` may be defined and set to ``True`` if this
       widget renders the same size regardless of the value of the *focus*
       parameter.


    .. method:: keypress(size, key)

       .. note::

          This method is not implemented in :class:`.Widget` but
          must be implemented by any selectable widget.
          See :meth:`.selectable`.

       :param size: See :meth:`Widget.render` for details
       :type size: widget size
       :param key: a single keystroke value; see :ref:`keyboard-input`
       :type key: bytes or unicode

       :returns: ``None`` if *key* was handled by this widget or
                 *key* (the same value passed) if *key* was not handled
                 by this widget

       Container widgets will typically call the :meth:`keypress` method on
       whichever of their children is set as the focus.

       The standard widgets use :attr:`_command_map` to
       determine what action should be performed for a given *key*. You may
       modify these values to your liking globally, at some level in the
       widget hierarchy or on individual widgets. See :class:`CommandMap`
       for the defaults.

       In your own widgets you may use whatever logic you like: filtering or
       translating keys, selectively passing along events etc.



    .. method:: mouse_event(size, event, button, col, row, focus)

       .. note::

          This method is not implemented in :class:`.Widget` but
          may be implemented by a subclass.  Not implementing this
          method is equivalent to having a method that always returns
          ``False``.

       :param size: See :meth:`Widget.render` for details.
       :type size: widget size
       :param event: Values such as ``'mouse press'``, ``'ctrl mouse press'``,
                     ``'mouse release'``, ``'meta mouse release'``,
                     ``'mouse drag'``; see :ref:`mouse-input`
       :type event: mouse event
       :param button: 1 through 5 for press events, often 0 for release events
                      (which button was released is often not known)
       :type button: int
       :param col: Column of the event, 0 is the left edge of this widget
       :type col: int
       :param row: Row of the event, 0 it the top row of this widget
       :type row: int
       :param focus: Set to ``True`` if this widget or one of its children
                     is in focus
       :type focus: bool

       :returns: ``True`` if the event was handled by this widget, ``False``
                 otherwise

       Container widgets will typically call the :meth:`mouse_event` method on
       whichever of their children is at the position (*col*, *row*).


    .. method:: get_cursor_coords(size)

       .. note::

          This method is not implemented in :class:`.Widget` but
          must be implemented by any widget that may return cursor
          coordinates as part of the canvas that :meth:`render` returns.

       :param size: See :meth:`Widget.render` for details.
       :type size: widget size

       :returns: (*col*, *row*) if this widget has a cursor, ``None`` otherwise

       Return the cursor coordinates (*col*, *row*) of a cursor that will appear
       as part of the canvas rendered by this widget when in focus, or ``None``
       if no cursor is displayed.

       The :class:`ListBox` widget
       uses this method to make sure a cursor in the focus widget is not
       scrolled out of view.  It is a separate method to avoid having to render
       the whole widget while calculating layout.

       Container widgets will typically call the :meth:`.get_cursor_coords`
       method on their focus widget.


    .. method:: get_pref_col(size)

       .. note::

          This method is not implemented in :class:`.Widget` but
          may be implemented by a subclass.

       :param size: See :meth:`Widget.render` for details.
       :type size: widget size

       :returns: a column number or ``'left'`` for the leftmost available
                 column or ``'right'`` for the rightmost available column

       Return the preferred column for the cursor to be displayed in this
       widget. This value might not be the same as the column returned from
       :meth:`get_cursor_coords`.

       The :class:`ListBox` and :class:`Pile`
       widgets call this method on a widget losing focus and use the value
       returned to call :meth:`.move_cursor_to_coords` on the widget becoming
       the focus. This allows the focus to move up and down through widgets
       while keeping the cursor in approximately the same column on screen.


    .. method:: move_cursor_to_coords(size, col, row)

       .. note::

          This method is not implemented in :class:`.Widget` but
          may be implemented by a subclass.  Not implementing this
          method is equivalent to having a method that always returns
          ``False``.

       :param size: See :meth:`Widget.render` for details.
       :type size: widget size
       :param col: new column for the cursor, 0 is the left edge of this widget
       :type col: int
       :param row: new row for the cursor, 0 it the top row of this widget
       :type row: int

       :returns: ``True`` if the position was set successfully anywhere on
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