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    Widget base class

    .. attribute:: __metaclass__
       :annotation: = urwid.WidgetMeta

       See :class:`urwid.WidgetMeta` definition

    .. attribute:: _selectable
       :annotation: = False

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

    .. attribute:: _sizing
       :annotation: = frozenset(['flow', 'box', 'fixed'])

       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
                 *row*, ``False`` otherwise
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        Subclasses may leave these is if the are not selectable,
        or if they are always selectable they may
        set the :attr:`_selectable` class variable to ``True``.

        If this method returns ``True`` then the :meth:`.keypress` method
        must be implemented.

        Returning ``False`` does not guarantee that this widget will never be in
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        The sizing modes returned indicate the modes that may be
        supported by this widget, but is not sufficient to know
        that using that sizing mode will work.  Subclasses should
        make an effort to remove sizing modes they know will not
        work given the state of the widget, but many do not yet
        do this.

        If a sizing mode is missing from the set then the widget
        should fail when used in that mode.

        If ``'flow'`` is among the values returned then the other
        methods in this widget must be able to accept a
        single-element tuple (*maxcol*,) to their ``size``
        parameter, and the :meth:`rows` method must be defined.

        If ``'box'`` is among the values returned then the other
        methods must be able to accept a two-element tuple
        (*maxcol*, *maxrow*) to their size paramter.

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        This default implementation returns the *size* passed, or the *maxcol*
        passed and the value of :meth:`rows` as the *maxrow* when (*maxcol*,)
        is passed as the *size* parameter.

        .. note::

           This is a new method that hasn't been fully implemented across the
           standard widget types. In particular it has not yet been
           implemented for container widgets.

        :class:`Text` widgets have implemented this method.
        You can use :meth:`Text.pack` to calculate the minumum
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        >>> Divider()
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              of *text markup* with no display attribute already applied

            [*text markup*, *text markup*, ... ]
              all *text markup* in the list joined together

        :type markup: :ref:`text-markup`
        :param align: typically ``'left'``, ``'center'`` or ``'right'``
        :type align: text alignment mode
        :param wrap: typically ``'space'``, ``'any'`` or ``'clip'``
        :type wrap: text wrapping mode
        :param layout: defaults to a shared :class:`StandardTextLayout` instance
        :type layout: text layout instance

        >>> Text("Hello")
        <Text flow widget 'Hello'>
        >>> t = Text(('bold', "stuff"), 'right', 'any')
        >>> t
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        N)�_Text__superr+�
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        >>> print(t.text)
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        :returns: (*text*, *display attributes*)

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              complete bytes/unicode content of text widget

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              run length encoded display attributes for *text*, eg.
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        >>> Text("Hello").get_text() # ... = u in Python 2
        (...'Hello', [])
        >>> Text(('bright', "Headline")).get_text()
        (...'Headline', [('bright', 8)])
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        Read-only property returning the complete bytes/unicode content
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        cCs|j�dS)Nr;)r�)rKr4r4r5r`�szo
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        :type mode: text alignment mode

        >>> t = Text("word")
        >>> t.set_align_mode('right')
        >>> t.align
        'right'
        >>> t.render((10,)).text # ... = b in Python 3
        [...'      word']
        >>> t.align = 'center'
        >>> t.render((10,)).text
        [...'   word   ']
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        z Alignment mode %r not supported.N)r�Zsupports_align_moder�r�rU)rK�moder4r4r5�set_align_mode�s

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        Set text wrapping mode. Supported modes depend on text layout
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        >>> t = Text("some words")
        >>> t.render((6,)).text # ... = b in Python 3
        [...'some  ', ...'words ']
        >>> t.set_wrap_mode('clip')
        >>> t.wrap
        'clip'
        >>> t.render((6,)).text
        [...'some w']
        >>> t.wrap = 'any'  # Urwid 0.9.9 or later
        >>> t.render((6,)).text
        [...'some w', ...'ords  ']
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        TextError: Wrap mode 'somehow' not supported.
        zWrap mode %r not supported.N)r�Zsupports_wrap_moder�r�rU)rKr�r4r4r5�
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        Set the text layout object, alignment and wrapping modes at
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        :type wrap: text wrapping mode
        :param layout: defaults to a shared :class:`StandardTextLayout` instance
        :type layout: text layout instance

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        <Text flow widget 'hi' align='right' wrap='clip'>
        N)r
Zdefault_layout�_layoutr�r�)rKr�r�r�r4r4r5r��s
		
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        Render contents with wrapping and alignment.  Return canvas.

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        >>> Text("important things").render((18,)).text # ... = b in Python 3
        [...'important things  ']
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        Return the number of rows the rendered text requires.

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        )r��_update_cache_translation�_cache_translation)rKr}�tar4r4r5r��szText.get_line_translationcCsI|r|\}}n|j�\}}||_|j||�|_dS)N)r�r��_calc_line_translationr�)rKr}r�r�r�r4r4r5r�s	zText._update_cache_translationcCs"|jj||j|j|j�S)N)r�r�r�r�)rKr�r}r4r4r5r�s		zText._calc_line_translationcCs|j�\}}|dk	rz|\}t|jd�s=|S|j|||f�}|jj||�}|t|�fSd}d}xn|t|�kr�|jd|�}	|	dkr�t|�}	t|||	�}
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        Return the number of screen columns and rows required for
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        :type size: widget size

        >>> Text("important things").pack()
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        Nr"r�
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			r�c@seZdZdS)�	EditErrorN)r6r7r8r4r4r4r5r�Esr�c@s�eZdZdZdgZdd�Zdd�Zdddeedd	d	d	d
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dd�Zdd�Zdd�Zedd��Zdd�Zedd�e�Zdd �Zd!d"�Zd#d$�Zeeed%d&�Zd'd(�Zd)d*�Zd+d,�Zd-d.�Zd/d0�Zd1d2�Zd3d4�Zdd5d6�Z d	d7d8�Z!d9d:�Z"d;d<�Z#d	S)=�Edita0
    Text editing widget implements cursor movement, text insertion and
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        Filter for text that may be entered into this widget by the user

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        :param caption: markup for caption preceeding edit_text, see
                        :class:`Text` for description of text markup.
        :type caption: text markup
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                          must match the text in the caption
        :type edit_text: bytes or unicode
        :param multiline: True: 'enter' inserts newline  False: return it
        :type multiline: bool
        :param align: typically 'left', 'center' or 'right'
        :type align: text alignment mode
        :param wrap: typically 'space', 'any' or 'clip'
        :type wrap: text wrapping mode
        :param allow_tab: True: 'tab' inserts 1-8 spaces  False: return it
        :type allow_tab: bool
        :param edit_pos: initial position for cursor, None:end of edit_text
        :type edit_pos: int
        :param layout: defaults to a shared :class:`StandardTextLayout` instance
        :type layout: text layout instance
        :param mask: hide text entered with this character, None:disable mask
        :type mask: bytes or unicode

        >>> Edit()
        <Edit selectable flow widget '' edit_pos=0>
        >>> Edit("Y/n? ", "yes")
        <Edit selectable flow widget 'yes' caption='Y/n? ' edit_pos=3>
        >>> Edit("Name ", "Smith", edit_pos=1)
        <Edit selectable flow widget 'Smith' caption='Name ' edit_pos=1>
        >>> Edit("", "3.14", align='right')
        <Edit selectable flow widget '3.14' align='right' edit_pos=4>
        r�rNF)�_Edit__superr+�	multiline�	allow_tab�	_edit_pos�set_caption�
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Edit.__init__cCs\|jj�dd�t|j�gdt|j�gt|j�dg|jdkS)Nr;zcaption=r�Tr�)r�rmr�
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        Returns ``(text, display attributes)``. See :meth:`Text.get_text`
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        Text returned includes the caption and edit_text, possibly masked.

        >>> Edit("What? ","oh, nothing.").get_text() # ... = u in Python 2
        (...'What? oh, nothing.', [])
        >>> Edit(('bright',"user@host:~$ "),"ls").get_text()
        (...'user@host:~$ ls', [('bright', 13)])
        >>> Edit("password:", "seekrit", mask="*").get_text()
        (...'password:*******', [])
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        Return the preferred column for the cursor, or the
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        moving the cursor up or down between widgets so that the
        column selected is one that the user would expect.

        >>> size = (10,)
        >>> Edit().get_pref_col(size)
        0
        >>> e = Edit("", "word")
        >>> e.get_pref_col(size)
        4
        >>> e.keypress(size, 'left')
        >>> e.get_pref_col(size)
        3
        >>> e.keypress(size, 'end')
        >>> e.get_pref_col(size)
        'right'
        >>> e = Edit("", "2\nwords")
        >>> e.keypress(size, 'left')
        >>> e.keypress(size, 'up')
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        >>> e.set_caption("cap1")
        >>> print(e.caption)
        cap1
        >>> e.set_caption(('bold', "cap2"))
        >>> print(e.caption)
        cap2
        >>> e.attrib
        [('bold', 4)]
        >>> e.caption = "cap3"  # not supported because caption stores text but set_caption() takes markup
        Traceback (most recent call last):
        AttributeError: can't set attribute
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        Set the cursor position with a self.edit_text offset.
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        4
        >>> e.set_edit_pos(2)
        >>> e.edit_pos
        2
        >>> e.edit_pos = -1  # Urwid 0.9.9 or later
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        Set the character for masking text away.

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        Set the edit text for this widget.

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        >>> print(e.edit_text)
        yes
        >>> e
        <Edit selectable flow widget 'yes' edit_pos=0>
        >>> e.edit_text = "no"  # Urwid 0.9.9 or later
        >>> print(e.edit_text)
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        Return the edit text for this widget.

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                     must match the text in the caption
        :type text: bytes or unicode

        >>> e = Edit("", "42")
        >>> e.insert_text(".5")
        >>> e
        <Edit selectable flow widget '42.5' edit_pos=4>
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        >>> print(e.edit_text)
        1x
        >>> e.keypress(size, 'backspace')
        >>> e.keypress(size, 'end')
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Cs�|\}|j|�}|j|d�\}}||ksN|t|�krRdSt|j�d|||�}|t|j�}	|	dkr�d}	|	t|j�kr�t|j�}	|	|_||f|_|j	�dS)a�
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        True
        >>> e.edit_pos
        4
        >>> e.move_cursor_to_coords(size, 5, 3)
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