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#------------------------------------------------------------------------------
# Copyright (c) 2005, Enthought, Inc.
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in enthought/LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
# Thanks for using Enthought open source!
#
# Author: Enthought, Inc.
# Description: <Enthought pyface package component>
#------------------------------------------------------------------------------
""" Mix-in class for split widgets. """


# Enthought library imports.
from traits.api import Callable, Enum, Float, Interface


class ISplitWidget(Interface):
    """ Mix-in class for split widgets.

A split widget is one that is split in two either horizontally or
vertically.
"""

    #### 'ISplitWidget' interface #############################################

    # The direction in which the widget is split.
    #
    # Splitting vertically means there will be a left hand panel and a right
    # hand panel, splitting horizontally means there will be a top panel and
    # a bottom panel.
    direction = Enum('vertical', 'vertical', 'horizontal')

    # The ratio of the size of the left/top pane to the right/bottom pane.
    ratio = Float(0.5)

    # An optional callable that provides the left hand/top panel.
    lhs = Callable

    # An optional callable that provides the right hand/bottom panel.
    rhs = Callable

    ###########################################################################
    # Protected 'ISplitWidget' interface.
    ###########################################################################

    def _create_splitter(self, parent):
        """ Create the toolkit-specific control that represents the widget. """

    def _create_lhs(self, parent):
        """ Creates the left hand/top panel depending on the direction. """

    def _create_rhs(self, parent):
        """ Creates the right hand/bottom panel depending on the direction. """


class MSplitWidget(object):
    """ The mixin class that contains common code for toolkit specific
implementations of the ISplitWidget interface.
"""

#### EOF ######################################################################
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