82 lines
2.8 KiB
Python
82 lines
2.8 KiB
Python
#
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# Copyright (c) 2011 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Specialized field definitions.
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"""
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from zope.component import adapts
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from zope.interface import Attribute, implements
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from zope.schema import Field, List
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from zope.schema.interfaces import IField, IList
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from cybertools.composer.schema.interfaces import FieldType
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class IRelation(IField):
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""" An object addressed via a single relation.
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"""
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target_types = Attribute('A list of names that denote types of '
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'loops objects (typically concept types) that may be used as '
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'targets for the relation.')
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class IRelationSet(IList):
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""" A collection of objects addressed via a set of relations.
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Despite its name, the collection may have a predefined order.
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"""
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target_types = Attribute('A list of names that denote types of '
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'loops objects (typically concept types) that may be used as '
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'targets for the relations.')
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selection_view = Attribute('The name of a view that provides a collection '
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'of candidates to select from, in JSON format.')
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class Relation(Field):
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implements(IRelation)
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__typeInfo__ = ('relation',
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FieldType('relation', 'relation',
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u'A field representing a related object.',
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instanceName='relation',
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displayRenderer='display_relation'))
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def __init__(self, *args, **kw):
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self.target_types = kw.pop('target_types', ())
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super(Relation, self).__init__(*args, **kw)
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class RelationSet(List):
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implements(IRelationSet)
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__typeInfo__ = ('relationset',
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FieldType('relationset', 'relationset',
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u'A field representing a sequence of related objects.',
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instanceName='relationset',
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displayRenderer='display_relationset'))
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def __init__(self, *args, **kw):
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self.target_types = kw.pop('target_types', ())
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self.selection_view = kw.pop('selection_view', None)
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super(RelationSet, self).__init__(*args, **kw)
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