How to use the birdears.urwid.widget.Widget function in birdears

break
            assert i < len(last), repr((on, maxcol))
            la, ln = last[i]

        if i < len(last):
            o += [(la, ln)] + last[i + 1:]
        last = o
        y_count += 1

    if y_count:
        rowsets.append((y_count, last))

    return rowsets


class GraphVScale(Widget):
    _sizing = frozenset([BOX])

    def __init__(self, labels, top):
        """
        GraphVScale( [(label1 position, label1 markup),...], top )
        label position -- 0 < position < top for the y position
        label markup -- text markup for this label
        top -- top y position

        This widget is a vertical scale for the BarGraph widget that
        can correspond to the BarGraph's horizontal lines
        """
        self.set_scale(labels, top)

    def set_scale(self, labels, top):
        """

self.focus_position = i

        if not hasattr(w, 'mouse_event'):
            return False

        tsize = self.get_item_size(size, i, focus, item_rows)
        return w.mouse_event(tsize, event, button, col, row-wrow,
            focus)



class ColumnsError(Exception):
    pass


class Columns(Widget, WidgetContainerMixin, WidgetContainerListContentsMixin):
    """
    Widgets arranged horizontally in columns from left to right
    """
    _sizing = frozenset([FLOW, BOX])

    def __init__(self, widget_list, dividechars=0, focus_column=None,
        min_width=1, box_columns=None):
        """
        :param widget_list: iterable of flow or box widgets
        :param dividechars: number of blank characters between columns
        :param focus_column: index into widget_list of column in focus,
            if ``None`` the first selectable widget will be chosen.
        :param min_width: minimum width for each column which is not
            calling widget.pack() in *widget_list*.
        :param box_columns: a list of column indexes containing box widgets
            whose height is set to the maximum of the rows

#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# Urwid web site: http://excess.org/urwid/

from __future__ import division, print_function

from ..urwid.util import int_scale
from ..urwid.widget import (Widget, WidgetError,
    BOX, FLOW, LEFT, CENTER, RIGHT, PACK, CLIP, GIVEN, RELATIVE, RELATIVE_100,
    TOP, MIDDLE, BOTTOM, delegate_to_widget_mixin)
from ..urwid.split_repr import remove_defaults
from ..urwid.canvas import CompositeCanvas, SolidCanvas
from ..urwid.widget import Divider, Edit, Text, SolidFill # doctests


class WidgetDecoration(Widget):  # "decorator" was already taken
    """
    original_widget -- the widget being decorated

    This is a base class for decoration widgets, widgets
    that contain one or more widgets and only ever have
    a single focus.  This type of widget will affect the
    display or behaviour of the original_widget but it is
    not part of determining a chain of focus.

    Don't actually do this -- use a WidgetDecoration subclass
    instead, these are not real widgets:

    >>> WidgetDecoration(Text(u"hi"))
    >
    """
    def __init__(self, original_widget):

self.get_display_widget(size)
        self.__super.mouse_event(size, event, button, col, row, focus)
        self._set_focus_from_display_widget()
        return True # at a minimum we adjusted our focus

    def get_pref_col(self, size):
        """Return pref col from display widget."""
        self.get_display_widget(size)
        return self.__super.get_pref_col(size)



class OverlayError(Exception):
    pass

class Overlay(Widget, WidgetContainerMixin, WidgetContainerListContentsMixin):
    """
    Overlay contains two box widgets and renders one on top of the other
    """
    _selectable = True
    _sizing = frozenset([BOX])

    _DEFAULT_BOTTOM_OPTIONS = (
        LEFT, None, RELATIVE, 100, None, 0, 0,
        TOP, None, RELATIVE, 100, None, 0, 0)

    def __init__(self, top_w, bottom_w, align, width, valign, height,
            min_width=None, min_height=None, left=0, right=0, top=0, bottom=0):
        """
        :param top_w: a flow, box or fixed widget to overlay "on top"
        :type top_w: Widget
        :param bottom_w: a box widget to appear "below" previous widget

def content(self, trim_left=0, trim_right=0, cols=None, rows=None,
                attr_map=None):
        if self.scrolling_up == 0:
            for line in self.term:
                yield line
        else:
            buf = self.scrollback_buffer + self.term
            for line in buf[-(self.height+self.scrolling_up):-self.scrolling_up]:
                yield line

    def content_delta(self, other):
        if other is self:
            return [self.cols()]*self.rows()
        return self.content()

class Terminal(Widget):
    _selectable = True
    _sizing = frozenset([BOX])

    signals = ['closed', 'beep', 'leds', 'title']

    def __init__(self, command, env=None, main_loop=None, escape_sequence=None):
        """
        A terminal emulator within a widget.

        'command' is the command to execute inside the terminal, provided as a
        list of the command followed by its arguments.  If 'command' is None,
        the command is the current user's shell. You can also provide a callable
        instead of a command, which will be executed in the subprocess.

        'env' can be used to pass custom environment variables. If omitted,
        os.environ is used.

lambda self: self._get_data,
            nocache_bargraph_get_data)


def nocache_bargraph_get_data(self, get_data_fn):
    """
    Disable caching on this bargraph because get_data_fn needs
    to be polled to get the latest data.
    """
    self.render = nocache_widget_render_instance(self)
    self._get_data = get_data_fn

class BarGraphError(Exception):
    pass

class BarGraph(with_metaclass(BarGraphMeta, Widget)):
    _sizing = frozenset([BOX])

    ignore_focus = True

    eighths = u' ▁▂▃▄▅▆▇'
    hlines = u'_⎺⎻─⎼⎽'

    def __init__(self, attlist, hatt=None, satt=None):
        """
        Create a bar graph with the passed display characteristics.
        see set_segment_attributes for a description of the parameters.
        """

        self.set_segment_attributes(attlist, hatt, satt)
        self.set_data([], 1, None)
        self.set_bar_width(None)

All widgets must implement this function.
        """
        raise NotImplementedError()


def fixed_size(size):
    """
    raise ValueError if size != ().

    Used by FixedWidgets to test size parameter.
    """
    if size != ():
        raise ValueError("FixedWidget takes only () for size." \
            "passed: %r" % (size,))

class FixedWidget(Widget):
    """
    Deprecated.  Inherit from Widget and add:

        _sizing = frozenset(['fixed'])

    at the top of your class definition instead.

    Base class of widgets that know their width and height and
    cannot be resized
    """
    _sizing = frozenset([FIXED])

    def render(self, size, focus=False):
        """
        All widgets must implement this function.
        """

def _repr_words(self):
        words = []
        if self.selectable():
            words = ["selectable"] + words
        if self.sizing() and self.sizing() != frozenset([FLOW, BOX, FIXED]):
            sizing_modes = list(self.sizing())
            sizing_modes.sort()
            words.append("/".join(sizing_modes))
        return words + ["widget"]

    def _repr_attrs(self):
        return {}


class FlowWidget(Widget):
    """
    Deprecated.  Inherit from Widget and add:

        _sizing = frozenset(['flow'])

    at the top of your class definition instead.

    Base class of widgets that determine their rows from the number of
    columns available.
    """
    _sizing = frozenset([FLOW])

    def rows(self, size, focus=False):
        """
        All flow widgets must implement this function.
        """

_sizing = frozenset([FIXED])

    def render(self, size, focus=False):
        """
        All widgets must implement this function.
        """
        raise NotImplementedError()

    def pack(self, size=None, focus=False):
        """
        All fixed widgets must implement this function.
        """
        raise NotImplementedError()


class Divider(Widget):
    """
    Horizontal divider widget
    """
    _sizing = frozenset([FLOW])

    ignore_focus = True

    def __init__(self,div_char=u" ",top=0,bottom=0):
        """
        :param div_char: character to repeat across line
        :type div_char: bytes or unicode

        :param top: number of blank lines above
        :type top: int

        :param bottom: number of blank lines below

c = CanvasCombine(combinelist)
        if maxrow - rows:
            c.pad_trim_top_bottom(0, maxrow - rows)
        return c



def scale_bar_values( bar, top, maxrow ):
    """
    Return a list of bar values aliased to integer values of maxrow.
    """
    return [maxrow - int(float(v) * maxrow / top + 0.5) for v in bar]


class ProgressBar(Widget):
    _sizing = frozenset([FLOW])

    eighths = u' ▏▎▍▌▋▊▉'

    text_align = CENTER

    def __init__(self, normal, complete, current=0, done=100, satt=None):
        """
        :param normal: display attribute for incomplete part of progress bar
        :param complete: display attribute for complete part of progress bar
        :param current: current progress
        :param done: progress amount at 100%
        :param satt: display attribute for smoothed part of bar where the
                     foreground of satt corresponds to the normal part and the
                     background corresponds to the complete part.  If satt
                     is ``None`` then no smoothing will be done.