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# Copyright (c) 2015 Mirantis, 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.
import itertools as it
from django import forms
from django.template import loader
from django.utils.encoding import force_str
from django.utils import formats
from muranodashboard.common import utils
# Widge and Input code is copied from https://github.com/gregmuellegger/
# django-floppyforms/blob/master/floppyforms/widgets.py to remove the
# dependency of django-floppyforms due to not very well supported anymore
# and was dropped from Ubuntu in Xenial.
class Widget(forms.Widget):
is_required = False
# Backported from Django 1.7
@property
def is_hidden(self):
return self.input_type == 'hidden' \
if hasattr(self, 'input_type') else False
# Backported from Django 1.9
if not hasattr(forms.Widget, 'format_value'):
def format_value(self, value):
return self._format_value(value)
class Input(Widget):
template_name = 'common/tri_state_checkbox/base.html'
input_type = None
datalist = None
def __init__(self, *args, **kwargs):
datalist = kwargs.pop('datalist', None)
if datalist is not None:
self.datalist = datalist
template_name = kwargs.pop('template_name', None)
if template_name is not None:
self.template_name = template_name
super(Input, self).__init__(*args, **kwargs)
# This attribute is used to inject a surrounding context in the
# floppyforms templatetags, when rendered inside a complete form.
self.context_instance = None
def get_context_data(self):
return {}
def _format_value(self, value):
if self.is_localized:
value = formats.localize_input(value)
return force_str(value)
def get_context(self, name, value, attrs=None):
context = {
'type': self.input_type,
'name': name,
'hidden': self.is_hidden,
'required': self.is_required,
'True': True,
}
# True is injected in the context to allow stricter comparisons
# for widget attrs. See #25.
if self.is_hidden:
context['hidden'] = True
if value is None:
value = ''
if value != '':
# Only add the value if it is non-empty
context['value'] = self.format_value(value)
context.update(self.get_context_data())
context['attrs'] = self.build_attrs(attrs)
for key, attr in context['attrs'].items():
if attr == 1:
# 1 == True so 'key="1"' will show up only as 'key'
# Casting to a string so that it doesn't equal to True
# See #25.
if not isinstance(attr, bool):
context['attrs'][key] = str(attr)
if self.datalist is not None:
context['datalist'] = self.datalist
return context
def render(self, name, value, attrs=None, **kwargs):
template_name = kwargs.pop('template_name', None)
if template_name is None:
template_name = self.template_name
context = self.get_context(name, value, attrs=attrs or {})
context = utils.flatten_contexts(self.context_instance, context)
return loader.render_to_string(template_name, context)
class TriStateCheckboxSelectMultiple(Input):
"""Renders tri-state multi-selectable checkbox.
.. note:: Subclassed from ``CheckboxSelectMultiple`` and not from
``SelectMultiple`` only to make
``horizon.templatetags.form_helpers.is_checkbox`` able to recognize
this widget.
Otherwise template ``horizon/common/_form_field.html`` would render
this widget slightly incorrectly.
"""
VALUES_MAP = {
'True': True,
'False': False,
'None': None
}
def get_context(self, name, value, attrs=None, choices=()):
"""Renders html and JavaScript.
:param value: Dictionary of form
Choice => Value (Checked|Uncheckec|Indeterminate)
:type value: dict
"""
context = super(TriStateCheckboxSelectMultiple, self).get_context(
name, value, attrs
)
choices = dict(it.chain(self.choices, choices))
if value is None:
value = dict.fromkeys(choices, False)
else:
value = dict(dict.fromkeys(choices, False).items() +
value.items())
context['values'] = [
(choice, label, value[choice])
for choice, label in choices.iteritems()
]
return context
@classmethod
def parse_value(cls, value):
"""Converts encoded string with value to Python values."""
choice, value = value.split('=')
value = cls.VALUES_MAP[value]
return choice, value
def value_from_datadict(self, data, files, name):
"""Expects values in ``"key=False/True/None"`` form."""
try:
values = data.getlist(name)
except AttributeError:
if name in data:
values = [data[name]]
else:
values = []
return dict(map(self.parse_value, values))
class ExtraContextWidgetMixin(object):
def __init__(self, *args, **kwargs):
super(ExtraContextWidgetMixin, self).__init__(*args, **kwargs)
self.extra_context = kwargs.pop('extra_context', {})
def get_context(self, *args, **kwargs):
context = super(ExtraContextWidgetMixin, self).get_context(
*args, **kwargs
)
context.update(self.extra_context)
return context
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