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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in 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!
from traits.api import Enum, Int, Interface, Tuple
#: Value that indicates the default size values should be used.
DEFAULT_SIZE = -1
#: Trait for sizes of widgets.
Size = Tuple(Int(DEFAULT_SIZE), Int(DEFAULT_SIZE))
#: Trait for size policy values.
SizePolicy = Enum("default", "fixed", "preferred", "expand")
class ILayoutItem(Interface):
""" An item that can participate in layout. """
#: The minimum size that the item can take.
minimum_size = Size
#: The maximum size that the item can take.
maximum_size = Size
#: Weight factor used to distribute extra space between widgets.
stretch = Tuple(Int, Int)
#: How the item should behave when more space is available.
size_policy = Tuple(SizePolicy, SizePolicy)
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