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"""ContainerWidget class.

Represents a container that can be used to group other widgets.

"""

#-----------------------------------------------------------------------------

# Copyright (c) 2013, the IPython Development Team.

#

# Distributed under the terms of the Modified BSD License.

#

# The full license is in the file COPYING.txt, distributed with this software.

#-----------------------------------------------------------------------------

#-----------------------------------------------------------------------------

# Imports

#-----------------------------------------------------------------------------

from .widget import DOMWidget

from IPython.utils.traitlets import Unicode, Tuple, TraitError

#-----------------------------------------------------------------------------

# Classes

#-----------------------------------------------------------------------------

class ContainerWidget(DOMWidget):

_view_name = Unicode('ContainerView', sync=True)

# Child widgets in the container.

# Using a tuple here to force reassignment to update the list.

# When a proper notifying-list trait exists, that is what should be used here.

children = Tuple()

_children = Tuple(sync=True)

def __init__(self, **kwargs):

super(ContainerWidget, self).__init__(**kwargs)

self.on_displayed(ContainerWidget._fire_children_displayed)

def _fire_children_displayed(self):

for child in self._children:

child._handle_displayed()

def _children_changed(self, name, old, new):

"""Validate children list.

Makes sure only one instance of any given model can exist in the

children list.

An excellent post on uniqifiers is available at

http://www.peterbe.com/plog/uniqifiers-benchmark

which provides the inspiration for using this implementation. Below

I've implemented the `f5` algorithm using Python comprehensions."""

if new is not None:

seen = {}

def add_item(i):

seen[i.model_id] = True

return i

self._children = [add_item(i) for i in new if not i.model_id in seen]

class PopupWidget(ContainerWidget):

_view_name = Unicode('PopupView', sync=True)

description = Unicode(sync=True)

button_text = Unicode(sync=True)