/usr/lib/python2.7/dist-packages/horizon/forms/fields.py is in python-django-horizon 1:2014.1.5-0ubuntu2.1.
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# Copyright 2012 Nebula, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from django.core import urlresolvers
from django.forms import fields
from django.forms import widgets
class DynamicSelectWidget(widgets.Select):
"""A subclass of the ``Select`` widget which renders extra attributes for
use in callbacks to handle dynamic changes to the available choices.
"""
_data_add_url_attr = "data-add-item-url"
def render(self, *args, **kwargs):
add_item_url = self.get_add_item_url()
if add_item_url is not None:
self.attrs.update({self._data_add_url_attr: add_item_url})
return super(DynamicSelectWidget, self).render(*args, **kwargs)
def get_add_item_url(self):
if callable(self.add_item_link):
return self.add_item_link()
try:
if self.add_item_link_args:
return urlresolvers.reverse(self.add_item_link,
args=[self.add_item_link_args])
else:
return urlresolvers.reverse(self.add_item_link)
except urlresolvers.NoReverseMatch:
return self.add_item_link
class DynamicChoiceField(fields.ChoiceField):
"""A subclass of ``ChoiceField`` with additional properties that make
dynamically updating its elements easier.
Notably, the field declaration takes an extra argument, ``add_item_link``
which may be a string or callable defining the URL that should be used
for the "add" link associated with the field.
"""
widget = DynamicSelectWidget
def __init__(self,
add_item_link=None,
add_item_link_args=None,
*args,
**kwargs):
super(DynamicChoiceField, self).__init__(*args, **kwargs)
self.widget.add_item_link = add_item_link
self.widget.add_item_link_args = add_item_link_args
class DynamicTypedChoiceField(DynamicChoiceField, fields.TypedChoiceField):
"""Simple mix of ``DynamicChoiceField`` and ``TypedChoiceField``."""
pass
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