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#------------------------------------------------------------------------------
# Copyright (c) 2013-2025, Nucleic Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file LICENSE, distributed with this software.
#------------------------------------------------------------------------------
from atom.api import Bool, Range, Value, Typed, ForwardTyped
from enaml.core.declarative import d_, observe
from .container import Container
from .widget import Widget, ProxyWidget
class ProxySplitItem(ProxyWidget):
""" The abstract definition of a proxy SplitItem object.
"""
#: A reference to the SplitItem declaration.
declaration = ForwardTyped(lambda: SplitItem)
def set_stretch(self, stretch):
raise NotImplementedError
def set_collapsible(self, collapsible):
raise NotImplementedError
class SplitItem(Widget):
""" A widget which can be used as an item in a Splitter.
A SplitItem is a widget which can be used as a child of a Splitter
widget. It can have at most a single child widget which is an
instance of Container.
"""
#: The stretch factor for this item. The stretch factor determines
#: how much an item is resized relative to its neighbors when the
#: splitter space is allocated.
stretch = d_(Range(low=0, value=1))
#: Whether or not the item can be collapsed to zero width by the
#: user. This holds regardless of the minimum size of the item.
collapsible = d_(Bool(True))
#: This is a deprecated attribute. It should no longer be used.
preferred_size = d_(Value())
#: A reference to the ProxySplitItem object.
proxy = Typed(ProxySplitItem)
def split_widget(self):
""" Get the split widget defined on the item.
The split widget is the last child Container.
"""
for child in reversed(self.children):
if isinstance(child, Container):
return child
#--------------------------------------------------------------------------
# Observers
#--------------------------------------------------------------------------
@observe('stretch', 'collapsible')
def _update_proxy(self, change):
""" An observer which sends state change to the proxy.
"""
# The superclass handler implementation is sufficient.
super(SplitItem, self)._update_proxy(change)
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