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        >>> si.render((4,), focus=True).cursor
        (1, 0)
        >>> si = SelectableIcon("((*))", 2)
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        :param label: markup for check box label
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        :param has_mixed: True if "mixed" is a state to cycle through
        :param on_state_change: shorthand for connect_signal()
                                function call for a single callback
        :param user_data: user_data for on_state_change

        Signals supported: ``'change'``, ``"postchange"``

        Register signal handler with::

          urwid.connect_signal(check_box, 'change', callback, user_data)

        where callback is callback(check_box, new_state [,user_data])
        Unregister signal handlers with::

          urwid.disconnect_signal(check_box, 'change', callback, user_data)

        >>> CheckBox(u"Confirm")
        <CheckBox selectable flow widget 'Confirm' state=False>
        >>> CheckBox(u"Yogourt", "mixed", True)
        <CheckBox selectable flow widget 'Yogourt' state='mixed'>
        >>> cb = CheckBox(u"Extra onions", True)
        >>> cb
        <CheckBox selectable flow widget 'Extra onions' state=True>
        >>> cb.render((20,), focus=True).text # ... = b in Python 3
        [...'[X] Extra onions    ']
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        Change the check box label.

        label -- markup for label.  See Text widget for description
        of text markup.

        >>> cb = CheckBox(u"foo")
        >>> cb
        <CheckBox selectable flow widget 'foo' state=False>
        >>> cb.set_label(('bright_attr', u"bar"))
        >>> cb
        <CheckBox selectable flow widget 'bar' state=False>
        N�r9Zset_text�rr>rrrr<�szCheckBox.set_labelcCs|jjS)a>
        Return label text.

        >>> cb = CheckBox(u"Seriously")
        >>> print(cb.get_label())
        Seriously
        >>> print(cb.label)
        Seriously
        >>> cb.set_label([('bright_attr', u"flashy"), u" normal"])
        >>> print(cb.label)  #  only text is returned
        flashy normal
        �r9rr0rrr�	get_label�s
zCheckBox.get_labelTcCs�|j|krdS||jkr0tdt|�t|�f��|j}|rN|dk	rN|�d|�||_td|j|j|f|jg�|_d|j_	|r�|dk	r�|�d|�dS)a�
        Set the CheckBox state.

        state -- True, False or "mixed"
        do_callback -- False to suppress signal from this change

        >>> changes = []
        >>> def callback_a(cb, state, user_data):
        ...     changes.append("A %r %r" % (state, user_data))
        >>> def callback_b(cb, state):
        ...     changes.append("B %r" % state)
        >>> cb = CheckBox('test', False, False)
        >>> key1 = connect_signal(cb, 'change', callback_a, "user_a")
        >>> key2 = connect_signal(cb, 'change', callback_b)
        >>> cb.set_state(True) # both callbacks will be triggered
        >>> cb.state
        True
        >>> disconnect_signal(cb, 'change', callback_a, "user_a")
        >>> cb.state = False
        >>> cb.state
        False
        >>> cb.set_state(True)
        >>> cb.state
        True
        >>> cb.set_state(False, False) # don't send signal
        >>> changes
        ["A True 'user_a'", 'B True', 'B False', 'B True']
        Nz%s Invalid state: %sr5�fixedrr6)
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��zCheckBox.set_statecCs|jS)z!Return the state of the checkbox.)r;r0rrr�	get_state�szCheckBox.get_statecCs|j|tkr|S|��dS)a�
        Toggle state on 'activate' command.

        >>> assert CheckBox._command_map[' '] == 'activate'
        >>> assert CheckBox._command_map['enter'] == 'activate'
        >>> size = (10,)
        >>> cb = CheckBox('press me')
        >>> cb.state
        False
        >>> cb.keypress(size, ' ')
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        True
        >>> cb.keypress(size, ' ')
        >>> cb.state
        False
        N)�_command_mapr�toggle_stater$rrrr&�szCheckBox.keypresscCsV|jdkr|�d�n<|jdkr>|jr2|�d�qR|�d�n|jdkrR|�d�dS)aM
        Cycle to the next valid state.

        >>> cb = CheckBox("3-state", has_mixed=True)
        >>> cb.state
        False
        >>> cb.toggle_state()
        >>> cb.state
        True
        >>> cb.toggle_state()
        >>> cb.state
        'mixed'
        >>> cb.toggle_state()
        >>> cb.state
        False
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zCheckBox.toggle_statecCs |dkst|�sdS|��dS)a
        Toggle state on button 1 press.

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        >>> cb = CheckBox("clickme")
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        True
        >>> cb.state
        True
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        :param group: list for radio buttons in same group
        :param label: markup for radio button label
        :param state: False, True, "mixed" or "first True"
        :param on_state_change: shorthand for connect_signal()
                                function call for a single 'change' callback
        :param user_data: user_data for on_state_change

        This function will append the new radio button to group.
        "first True" will set to True if group is empty.

        Signals supported: ``'change'``, ``"postchange"``

        Register signal handler with::

          urwid.connect_signal(radio_button, 'change', callback, user_data)

        where callback is callback(radio_button, new_state [,user_data])
        Unregister signal handlers with::

          urwid.disconnect_signal(radio_button, 'change', callback, user_data)

        >>> bgroup = [] # button group
        >>> b1 = RadioButton(bgroup, u"Agree")
        >>> b2 = RadioButton(bgroup, u"Disagree")
        >>> len(bgroup)
        2
        >>> b1
        <RadioButton selectable flow widget 'Agree' state=True>
        >>> b2
        <RadioButton selectable flow widget 'Disagree' state=False>
        >>> b2.render((15,), focus=True).text # ... = b in Python 3
        [...'( ) Disagree   ']
        rWFN)�group�_RadioButton__superr�append)rrXr>r?r@rArrrrJs$�zRadioButton.__init__TcCsR|j|krdS|j�||�|dk	r(dS|jD]}||kr<q.|jr.|�d�q.dS)a�
        Set the RadioButton state.

        state -- True, False or "mixed"

        do_callback -- False to suppress signal from this change

        If state is True all other radio buttons in the same button
        group will be set to False.

        >>> bgroup = [] # button group
        >>> b1 = RadioButton(bgroup, u"Agree")
        >>> b2 = RadioButton(bgroup, u"Disagree")
        >>> b3 = RadioButton(bgroup, u"Unsure")
        >>> b1.state, b2.state, b3.state
        (True, False, False)
        >>> b2.set_state(True)
        >>> b1.state, b2.state, b3.state
        (False, True, False)
        >>> def relabel_button(radio_button, new_state):
        ...     radio_button.set_label(u"Think Harder!")
        >>> key = connect_signal(b3, 'change', relabel_button)
        >>> b3
        <RadioButton selectable flow widget 'Unsure' state=False>
        >>> b3.set_state(True) # this will trigger the callback
        >>> b3
        <RadioButton selectable flow widget 'Think Harder!' state=True>
        NTF)r;rYr=rX)rr?rN�cbrrrr=xs

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        Set state to True.

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        >>> b1 = RadioButton(bgroup, "Agree")
        >>> b2 = RadioButton(bgroup, "Disagree")
        >>> b1.state, b2.state
        (True, False)
        >>> b2.toggle_state()
        >>> b1.state, b2.state
        (False, True)
        >>> b2.toggle_state()
        >>> b1.state, b2.state
        (False, True)
        TN)r=r0rrrrQ�szRadioButton.toggle_state)rWNN)T)	r'r(r)rrJrMrr=rQrrrrrVCs��
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        :param label: markup for button label
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                         function call for a single callback
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        Signals supported: ``'click'``

        Register signal handler with::

          urwid.connect_signal(button, 'click', callback, user_data)

        where callback is callback(button [,user_data])
        Unregister signal handlers with::

          urwid.disconnect_signal(button, 'click', callback, user_data)

        >>> Button(u"Ok")
        <Button selectable flow widget 'Ok'>
        >>> b = Button("Cancel")
        >>> b.render((15,), focus=True).text # ... = b in Python 3
        [...'< Cancel      >']
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        Change the button label.

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        >>> b
        <Button selectable flow widget 'Yup yup'>
        NrErFrrrr<�szButton.set_labelcCs|jjS)z�
        Return label text.

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        Ok
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        Ok
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        Send 'click' signal on 'activate' command.

        >>> assert Button._command_map[' '] == 'activate'
        >>> assert Button._command_map['enter'] == 'activate'
        >>> size = (15,)
        >>> b = Button(u"Cancel")
        >>> clicked_buttons = []
        >>> def handle_click(button):
        ...     clicked_buttons.append(button.label)
        >>> key = connect_signal(b, 'click', handle_click)
        >>> b.keypress(size, 'enter')
        >>> b.keypress(size, ' ')
        >>> clicked_buttons # ... = u in Python 2
        [...'Cancel', ...'Cancel']
        r_N)rPrrLr$rrrr&szButton.keypresscCs"|dkst|�sdS|�d�dS)a
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        >>> clicked_buttons = []
        >>> def handle_click(button):
        ...     clicked_buttons.append(button.label)
        >>> key = connect_signal(b, 'click', handle_click)
        >>> b.mouse_event(size, 'mouse press', 1, 4, 0, True)
        True
        >>> b.mouse_event(size, 'mouse press', 2, 4, 0, True) # ignored
        False
        >>> clicked_buttons # ... = u in Python 2
        [...'Ok']
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