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"""ContainerWidget class.
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Represents a container that can be used to group other widgets.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (c) 2013, the IPython Development Team.
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#
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# Distributed under the terms of the Modified BSD License.
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#
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# The full license is in the file COPYING.txt, distributed with this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from .widget import DOMWidget
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from IPython.utils.traitlets import Unicode, Bool, List, Instance
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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class ContainerWidget(DOMWidget):
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view_name = Unicode('ContainerView', sync=True)
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# Keys, all private and managed by helper methods. Flexible box model
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# classes...
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children = List(Instance(DOMWidget))
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_children = List(Instance(DOMWidget), sync=True)
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def __init__(self, *pargs, **kwargs):
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"""Constructor"""
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DOMWidget.__init__(self, *pargs, **kwargs)
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self.on_trait_change(self._validate, ['children'])
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def _validate(self, name, old, new):
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"""Validate children list.
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Makes sure only one instance of any given model can exist in the
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children list."""
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if new is not None and isinstance(new, list):
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children = []
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for child in new:
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if child not in children:
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children.append(child)
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self._children = children
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class PopupWidget(ContainerWidget):
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view_name = Unicode('PopupView', sync=True)
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description = Unicode(sync=True)
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button_text = Unicode(sync=True)
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