916 lines
34 KiB
Python
916 lines
34 KiB
Python
"""
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HTML Widget classes
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"""
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from __future__ import absolute_import, unicode_literals
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import copy
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import datetime
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from itertools import chain
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try:
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from urllib.parse import urljoin
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except ImportError: # Python 2
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from urlparse import urljoin
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from django.conf import settings
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from django.forms.util import flatatt, to_current_timezone
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from django.utils.datastructures import MultiValueDict, MergeDict
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from django.utils.html import conditional_escape, format_html, format_html_join
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from django.utils.translation import ugettext, ugettext_lazy
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from django.utils.encoding import force_text, python_2_unicode_compatible
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from django.utils.safestring import mark_safe
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from django.utils import datetime_safe, formats, six
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__all__ = (
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'Media', 'MediaDefiningClass', 'Widget', 'TextInput', 'PasswordInput',
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'HiddenInput', 'MultipleHiddenInput', 'ClearableFileInput',
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'FileInput', 'DateInput', 'DateTimeInput', 'TimeInput', 'Textarea', 'CheckboxInput',
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'Select', 'NullBooleanSelect', 'SelectMultiple', 'RadioSelect',
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'CheckboxSelectMultiple', 'MultiWidget',
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'SplitDateTimeWidget',
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)
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MEDIA_TYPES = ('css','js')
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@python_2_unicode_compatible
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class Media(object):
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def __init__(self, media=None, **kwargs):
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if media:
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media_attrs = media.__dict__
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else:
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media_attrs = kwargs
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self._css = {}
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self._js = []
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for name in MEDIA_TYPES:
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getattr(self, 'add_' + name)(media_attrs.get(name, None))
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# Any leftover attributes must be invalid.
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# if media_attrs != {}:
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# raise TypeError("'class Media' has invalid attribute(s): %s" % ','.join(media_attrs.keys()))
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def __str__(self):
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return self.render()
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def render(self):
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return mark_safe('\n'.join(chain(*[getattr(self, 'render_' + name)() for name in MEDIA_TYPES])))
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def render_js(self):
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return [format_html('<script type="text/javascript" src="{0}"></script>', self.absolute_path(path)) for path in self._js]
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def render_css(self):
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# To keep rendering order consistent, we can't just iterate over items().
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# We need to sort the keys, and iterate over the sorted list.
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media = sorted(self._css.keys())
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return chain(*[
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[format_html('<link href="{0}" type="text/css" media="{1}" rel="stylesheet" />', self.absolute_path(path), medium)
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for path in self._css[medium]]
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for medium in media])
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def absolute_path(self, path, prefix=None):
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if path.startswith(('http://', 'https://', '/')):
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return path
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if prefix is None:
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if settings.STATIC_URL is None:
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# backwards compatibility
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prefix = settings.MEDIA_URL
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else:
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prefix = settings.STATIC_URL
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return urljoin(prefix, path)
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def __getitem__(self, name):
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"Returns a Media object that only contains media of the given type"
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if name in MEDIA_TYPES:
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return Media(**{str(name): getattr(self, '_' + name)})
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raise KeyError('Unknown media type "%s"' % name)
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def add_js(self, data):
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if data:
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for path in data:
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if path not in self._js:
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self._js.append(path)
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def add_css(self, data):
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if data:
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for medium, paths in data.items():
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for path in paths:
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if not self._css.get(medium) or path not in self._css[medium]:
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self._css.setdefault(medium, []).append(path)
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def __add__(self, other):
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combined = Media()
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for name in MEDIA_TYPES:
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getattr(combined, 'add_' + name)(getattr(self, '_' + name, None))
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getattr(combined, 'add_' + name)(getattr(other, '_' + name, None))
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return combined
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def media_property(cls):
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def _media(self):
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# Get the media property of the superclass, if it exists
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sup_cls = super(cls, self)
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try:
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base = sup_cls.media
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except AttributeError:
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base = Media()
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# Get the media definition for this class
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definition = getattr(cls, 'Media', None)
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if definition:
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extend = getattr(definition, 'extend', True)
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if extend:
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if extend == True:
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m = base
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else:
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m = Media()
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for medium in extend:
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m = m + base[medium]
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return m + Media(definition)
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else:
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return Media(definition)
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else:
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return base
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return property(_media)
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class MediaDefiningClass(type):
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"Metaclass for classes that can have media definitions"
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def __new__(cls, name, bases, attrs):
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new_class = super(MediaDefiningClass, cls).__new__(cls, name, bases,
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attrs)
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if 'media' not in attrs:
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new_class.media = media_property(new_class)
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return new_class
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@python_2_unicode_compatible
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class SubWidget(object):
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"""
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Some widgets are made of multiple HTML elements -- namely, RadioSelect.
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This is a class that represents the "inner" HTML element of a widget.
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"""
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def __init__(self, parent_widget, name, value, attrs, choices):
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self.parent_widget = parent_widget
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self.name, self.value = name, value
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self.attrs, self.choices = attrs, choices
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def __str__(self):
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args = [self.name, self.value, self.attrs]
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if self.choices:
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args.append(self.choices)
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return self.parent_widget.render(*args)
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class Widget(six.with_metaclass(MediaDefiningClass)):
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is_hidden = False # Determines whether this corresponds to an <input type="hidden">.
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needs_multipart_form = False # Determines does this widget need multipart form
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is_localized = False
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is_required = False
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def __init__(self, attrs=None):
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if attrs is not None:
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self.attrs = attrs.copy()
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else:
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self.attrs = {}
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def __deepcopy__(self, memo):
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obj = copy.copy(self)
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obj.attrs = self.attrs.copy()
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memo[id(self)] = obj
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return obj
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def subwidgets(self, name, value, attrs=None, choices=()):
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"""
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Yields all "subwidgets" of this widget. Used only by RadioSelect to
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allow template access to individual <input type="radio"> buttons.
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Arguments are the same as for render().
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"""
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yield SubWidget(self, name, value, attrs, choices)
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def render(self, name, value, attrs=None):
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"""
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Returns this Widget rendered as HTML, as a Unicode string.
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The 'value' given is not guaranteed to be valid input, so subclass
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implementations should program defensively.
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"""
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raise NotImplementedError
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def build_attrs(self, extra_attrs=None, **kwargs):
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"Helper function for building an attribute dictionary."
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attrs = dict(self.attrs, **kwargs)
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if extra_attrs:
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attrs.update(extra_attrs)
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return attrs
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def value_from_datadict(self, data, files, name):
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"""
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Given a dictionary of data and this widget's name, returns the value
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of this widget. Returns None if it's not provided.
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"""
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return data.get(name, None)
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def _has_changed(self, initial, data):
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"""
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Return True if data differs from initial.
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"""
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# For purposes of seeing whether something has changed, None is
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# the same as an empty string, if the data or inital value we get
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# is None, replace it w/ ''.
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if data is None:
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data_value = ''
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else:
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data_value = data
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if initial is None:
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initial_value = ''
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else:
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initial_value = initial
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if force_text(initial_value) != force_text(data_value):
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return True
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return False
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def id_for_label(self, id_):
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"""
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Returns the HTML ID attribute of this Widget for use by a <label>,
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given the ID of the field. Returns None if no ID is available.
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This hook is necessary because some widgets have multiple HTML
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elements and, thus, multiple IDs. In that case, this method should
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return an ID value that corresponds to the first ID in the widget's
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tags.
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"""
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return id_
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class Input(Widget):
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"""
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Base class for all <input> widgets (except type='checkbox' and
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type='radio', which are special).
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"""
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input_type = None # Subclasses must define this.
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def _format_value(self, value):
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if self.is_localized:
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return formats.localize_input(value)
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return value
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def render(self, name, value, attrs=None):
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if value is None:
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value = ''
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final_attrs = self.build_attrs(attrs, type=self.input_type, name=name)
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if value != '':
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# Only add the 'value' attribute if a value is non-empty.
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final_attrs['value'] = force_text(self._format_value(value))
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return format_html('<input{0} />', flatatt(final_attrs))
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class TextInput(Input):
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input_type = 'text'
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def __init__(self, attrs=None):
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if attrs is not None:
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self.input_type = attrs.pop('type', self.input_type)
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super(TextInput, self).__init__(attrs)
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class PasswordInput(TextInput):
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input_type = 'password'
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def __init__(self, attrs=None, render_value=False):
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super(PasswordInput, self).__init__(attrs)
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self.render_value = render_value
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def render(self, name, value, attrs=None):
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if not self.render_value: value=None
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return super(PasswordInput, self).render(name, value, attrs)
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class HiddenInput(Input):
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input_type = 'hidden'
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is_hidden = True
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class MultipleHiddenInput(HiddenInput):
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"""
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A widget that handles <input type="hidden"> for fields that have a list
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of values.
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"""
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def __init__(self, attrs=None, choices=()):
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super(MultipleHiddenInput, self).__init__(attrs)
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# choices can be any iterable
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self.choices = choices
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def render(self, name, value, attrs=None, choices=()):
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if value is None: value = []
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final_attrs = self.build_attrs(attrs, type=self.input_type, name=name)
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id_ = final_attrs.get('id', None)
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inputs = []
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for i, v in enumerate(value):
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input_attrs = dict(value=force_text(v), **final_attrs)
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if id_:
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# An ID attribute was given. Add a numeric index as a suffix
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# so that the inputs don't all have the same ID attribute.
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input_attrs['id'] = '%s_%s' % (id_, i)
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inputs.append(format_html('<input{0} />', flatatt(input_attrs)))
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return mark_safe('\n'.join(inputs))
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def value_from_datadict(self, data, files, name):
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if isinstance(data, (MultiValueDict, MergeDict)):
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return data.getlist(name)
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return data.get(name, None)
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class FileInput(Input):
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input_type = 'file'
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needs_multipart_form = True
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def render(self, name, value, attrs=None):
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return super(FileInput, self).render(name, None, attrs=attrs)
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def value_from_datadict(self, data, files, name):
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"File widgets take data from FILES, not POST"
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return files.get(name, None)
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def _has_changed(self, initial, data):
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if data is None:
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return False
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return True
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FILE_INPUT_CONTRADICTION = object()
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class ClearableFileInput(FileInput):
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initial_text = ugettext_lazy('Currently')
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input_text = ugettext_lazy('Change')
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clear_checkbox_label = ugettext_lazy('Clear')
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template_with_initial = '%(initial_text)s: %(initial)s %(clear_template)s<br />%(input_text)s: %(input)s'
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template_with_clear = '%(clear)s <label for="%(clear_checkbox_id)s">%(clear_checkbox_label)s</label>'
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def clear_checkbox_name(self, name):
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"""
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Given the name of the file input, return the name of the clear checkbox
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input.
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"""
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return name + '-clear'
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def clear_checkbox_id(self, name):
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"""
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Given the name of the clear checkbox input, return the HTML id for it.
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"""
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return name + '_id'
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def render(self, name, value, attrs=None):
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substitutions = {
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'initial_text': self.initial_text,
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'input_text': self.input_text,
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'clear_template': '',
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'clear_checkbox_label': self.clear_checkbox_label,
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}
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template = '%(input)s'
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substitutions['input'] = super(ClearableFileInput, self).render(name, value, attrs)
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if value and hasattr(value, "url"):
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template = self.template_with_initial
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substitutions['initial'] = format_html('<a href="{0}">{1}</a>',
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value.url,
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force_text(value))
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if not self.is_required:
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checkbox_name = self.clear_checkbox_name(name)
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checkbox_id = self.clear_checkbox_id(checkbox_name)
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substitutions['clear_checkbox_name'] = conditional_escape(checkbox_name)
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substitutions['clear_checkbox_id'] = conditional_escape(checkbox_id)
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substitutions['clear'] = CheckboxInput().render(checkbox_name, False, attrs={'id': checkbox_id})
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substitutions['clear_template'] = self.template_with_clear % substitutions
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return mark_safe(template % substitutions)
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def value_from_datadict(self, data, files, name):
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upload = super(ClearableFileInput, self).value_from_datadict(data, files, name)
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if not self.is_required and CheckboxInput().value_from_datadict(
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data, files, self.clear_checkbox_name(name)):
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if upload:
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# If the user contradicts themselves (uploads a new file AND
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# checks the "clear" checkbox), we return a unique marker
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# object that FileField will turn into a ValidationError.
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return FILE_INPUT_CONTRADICTION
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# False signals to clear any existing value, as opposed to just None
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return False
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return upload
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|
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class Textarea(Widget):
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def __init__(self, attrs=None):
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# The 'rows' and 'cols' attributes are required for HTML correctness.
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default_attrs = {'cols': '40', 'rows': '10'}
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if attrs:
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default_attrs.update(attrs)
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super(Textarea, self).__init__(default_attrs)
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def render(self, name, value, attrs=None):
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if value is None: value = ''
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final_attrs = self.build_attrs(attrs, name=name)
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return format_html('<textarea{0}>\r\n{1}</textarea>',
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flatatt(final_attrs),
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force_text(value))
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|
|
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class DateInput(TextInput):
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def __init__(self, attrs=None, format=None):
|
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super(DateInput, self).__init__(attrs)
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if format:
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self.format = format
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self.manual_format = True
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else:
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self.format = formats.get_format('DATE_INPUT_FORMATS')[0]
|
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self.manual_format = False
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|
|
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def _format_value(self, value):
|
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if self.is_localized and not self.manual_format:
|
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return formats.localize_input(value)
|
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elif hasattr(value, 'strftime'):
|
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value = datetime_safe.new_date(value)
|
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return value.strftime(self.format)
|
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return value
|
|
|
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def _has_changed(self, initial, data):
|
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# If our field has show_hidden_initial=True, initial will be a string
|
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# formatted by HiddenInput using formats.localize_input, which is not
|
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# necessarily the format used for this widget. Attempt to convert it.
|
|
try:
|
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input_format = formats.get_format('DATE_INPUT_FORMATS')[0]
|
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initial = datetime.datetime.strptime(initial, input_format).date()
|
|
except (TypeError, ValueError):
|
|
pass
|
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return super(DateInput, self)._has_changed(self._format_value(initial), data)
|
|
|
|
|
|
class DateTimeInput(TextInput):
|
|
def __init__(self, attrs=None, format=None):
|
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super(DateTimeInput, self).__init__(attrs)
|
|
if format:
|
|
self.format = format
|
|
self.manual_format = True
|
|
else:
|
|
self.format = formats.get_format('DATETIME_INPUT_FORMATS')[0]
|
|
self.manual_format = False
|
|
|
|
def _format_value(self, value):
|
|
if self.is_localized and not self.manual_format:
|
|
return formats.localize_input(value)
|
|
elif hasattr(value, 'strftime'):
|
|
value = datetime_safe.new_datetime(value)
|
|
return value.strftime(self.format)
|
|
return value
|
|
|
|
def _has_changed(self, initial, data):
|
|
# If our field has show_hidden_initial=True, initial will be a string
|
|
# formatted by HiddenInput using formats.localize_input, which is not
|
|
# necessarily the format used for this widget. Attempt to convert it.
|
|
try:
|
|
input_format = formats.get_format('DATETIME_INPUT_FORMATS')[0]
|
|
initial = datetime.datetime.strptime(initial, input_format)
|
|
except (TypeError, ValueError):
|
|
pass
|
|
return super(DateTimeInput, self)._has_changed(self._format_value(initial), data)
|
|
|
|
|
|
class TimeInput(TextInput):
|
|
def __init__(self, attrs=None, format=None):
|
|
super(TimeInput, self).__init__(attrs)
|
|
if format:
|
|
self.format = format
|
|
self.manual_format = True
|
|
else:
|
|
self.format = formats.get_format('TIME_INPUT_FORMATS')[0]
|
|
self.manual_format = False
|
|
|
|
def _format_value(self, value):
|
|
if self.is_localized and not self.manual_format:
|
|
return formats.localize_input(value)
|
|
elif hasattr(value, 'strftime'):
|
|
return value.strftime(self.format)
|
|
return value
|
|
|
|
def _has_changed(self, initial, data):
|
|
# If our field has show_hidden_initial=True, initial will be a string
|
|
# formatted by HiddenInput using formats.localize_input, which is not
|
|
# necessarily the format used for this widget. Attempt to convert it.
|
|
try:
|
|
input_format = formats.get_format('TIME_INPUT_FORMATS')[0]
|
|
initial = datetime.datetime.strptime(initial, input_format).time()
|
|
except (TypeError, ValueError):
|
|
pass
|
|
return super(TimeInput, self)._has_changed(self._format_value(initial), data)
|
|
|
|
|
|
# Defined at module level so that CheckboxInput is picklable (#17976)
|
|
def boolean_check(v):
|
|
return not (v is False or v is None or v == '')
|
|
|
|
|
|
class CheckboxInput(Widget):
|
|
def __init__(self, attrs=None, check_test=None):
|
|
super(CheckboxInput, self).__init__(attrs)
|
|
# check_test is a callable that takes a value and returns True
|
|
# if the checkbox should be checked for that value.
|
|
self.check_test = boolean_check if check_test is None else check_test
|
|
|
|
def render(self, name, value, attrs=None):
|
|
final_attrs = self.build_attrs(attrs, type='checkbox', name=name)
|
|
if self.check_test(value):
|
|
final_attrs['checked'] = 'checked'
|
|
if not (value is True or value is False or value is None or value == ''):
|
|
# Only add the 'value' attribute if a value is non-empty.
|
|
final_attrs['value'] = force_text(value)
|
|
return format_html('<input{0} />', flatatt(final_attrs))
|
|
|
|
def value_from_datadict(self, data, files, name):
|
|
if name not in data:
|
|
# A missing value means False because HTML form submission does not
|
|
# send results for unselected checkboxes.
|
|
return False
|
|
value = data.get(name)
|
|
# Translate true and false strings to boolean values.
|
|
values = {'true': True, 'false': False}
|
|
if isinstance(value, six.string_types):
|
|
value = values.get(value.lower(), value)
|
|
return bool(value)
|
|
|
|
def _has_changed(self, initial, data):
|
|
# Sometimes data or initial could be None or '' which should be the
|
|
# same thing as False.
|
|
if initial == 'False':
|
|
# show_hidden_initial may have transformed False to 'False'
|
|
initial = False
|
|
return bool(initial) != bool(data)
|
|
|
|
class Select(Widget):
|
|
allow_multiple_selected = False
|
|
|
|
def __init__(self, attrs=None, choices=()):
|
|
super(Select, self).__init__(attrs)
|
|
# choices can be any iterable, but we may need to render this widget
|
|
# multiple times. Thus, collapse it into a list so it can be consumed
|
|
# more than once.
|
|
self.choices = list(choices)
|
|
|
|
def render(self, name, value, attrs=None, choices=()):
|
|
if value is None: value = ''
|
|
final_attrs = self.build_attrs(attrs, name=name)
|
|
output = [format_html('<select{0}>', flatatt(final_attrs))]
|
|
options = self.render_options(choices, [value])
|
|
if options:
|
|
output.append(options)
|
|
output.append('</select>')
|
|
return mark_safe('\n'.join(output))
|
|
|
|
def render_option(self, selected_choices, option_value, option_label):
|
|
option_value = force_text(option_value)
|
|
if option_value in selected_choices:
|
|
selected_html = mark_safe(' selected="selected"')
|
|
if not self.allow_multiple_selected:
|
|
# Only allow for a single selection.
|
|
selected_choices.remove(option_value)
|
|
else:
|
|
selected_html = ''
|
|
return format_html('<option value="{0}"{1}>{2}</option>',
|
|
option_value,
|
|
selected_html,
|
|
force_text(option_label))
|
|
|
|
def render_options(self, choices, selected_choices):
|
|
# Normalize to strings.
|
|
selected_choices = set(force_text(v) for v in selected_choices)
|
|
output = []
|
|
for option_value, option_label in chain(self.choices, choices):
|
|
if isinstance(option_label, (list, tuple)):
|
|
output.append(format_html('<optgroup label="{0}">', force_text(option_value)))
|
|
for option in option_label:
|
|
output.append(self.render_option(selected_choices, *option))
|
|
output.append('</optgroup>')
|
|
else:
|
|
output.append(self.render_option(selected_choices, option_value, option_label))
|
|
return '\n'.join(output)
|
|
|
|
class NullBooleanSelect(Select):
|
|
"""
|
|
A Select Widget intended to be used with NullBooleanField.
|
|
"""
|
|
def __init__(self, attrs=None):
|
|
choices = (('1', ugettext_lazy('Unknown')),
|
|
('2', ugettext_lazy('Yes')),
|
|
('3', ugettext_lazy('No')))
|
|
super(NullBooleanSelect, self).__init__(attrs, choices)
|
|
|
|
def render(self, name, value, attrs=None, choices=()):
|
|
try:
|
|
value = {True: '2', False: '3', '2': '2', '3': '3'}[value]
|
|
except KeyError:
|
|
value = '1'
|
|
return super(NullBooleanSelect, self).render(name, value, attrs, choices)
|
|
|
|
def value_from_datadict(self, data, files, name):
|
|
value = data.get(name, None)
|
|
return {'2': True,
|
|
True: True,
|
|
'True': True,
|
|
'3': False,
|
|
'False': False,
|
|
False: False}.get(value, None)
|
|
|
|
def _has_changed(self, initial, data):
|
|
# For a NullBooleanSelect, None (unknown) and False (No)
|
|
# are not the same
|
|
if initial is not None:
|
|
initial = bool(initial)
|
|
if data is not None:
|
|
data = bool(data)
|
|
return initial != data
|
|
|
|
class SelectMultiple(Select):
|
|
allow_multiple_selected = True
|
|
|
|
def render(self, name, value, attrs=None, choices=()):
|
|
if value is None: value = []
|
|
final_attrs = self.build_attrs(attrs, name=name)
|
|
output = [format_html('<select multiple="multiple"{0}>', flatatt(final_attrs))]
|
|
options = self.render_options(choices, value)
|
|
if options:
|
|
output.append(options)
|
|
output.append('</select>')
|
|
return mark_safe('\n'.join(output))
|
|
|
|
def value_from_datadict(self, data, files, name):
|
|
if isinstance(data, (MultiValueDict, MergeDict)):
|
|
return data.getlist(name)
|
|
return data.get(name, None)
|
|
|
|
def _has_changed(self, initial, data):
|
|
if initial is None:
|
|
initial = []
|
|
if data is None:
|
|
data = []
|
|
if len(initial) != len(data):
|
|
return True
|
|
initial_set = set([force_text(value) for value in initial])
|
|
data_set = set([force_text(value) for value in data])
|
|
return data_set != initial_set
|
|
|
|
@python_2_unicode_compatible
|
|
class RadioInput(SubWidget):
|
|
"""
|
|
An object used by RadioFieldRenderer that represents a single
|
|
<input type='radio'>.
|
|
"""
|
|
|
|
def __init__(self, name, value, attrs, choice, index):
|
|
self.name, self.value = name, value
|
|
self.attrs = attrs
|
|
self.choice_value = force_text(choice[0])
|
|
self.choice_label = force_text(choice[1])
|
|
self.index = index
|
|
|
|
def __str__(self):
|
|
return self.render()
|
|
|
|
def render(self, name=None, value=None, attrs=None, choices=()):
|
|
name = name or self.name
|
|
value = value or self.value
|
|
attrs = attrs or self.attrs
|
|
if 'id' in self.attrs:
|
|
label_for = format_html(' for="{0}_{1}"', self.attrs['id'], self.index)
|
|
else:
|
|
label_for = ''
|
|
choice_label = force_text(self.choice_label)
|
|
return format_html('<label{0}>{1} {2}</label>', label_for, self.tag(), choice_label)
|
|
|
|
def is_checked(self):
|
|
return self.value == self.choice_value
|
|
|
|
def tag(self):
|
|
if 'id' in self.attrs:
|
|
self.attrs['id'] = '%s_%s' % (self.attrs['id'], self.index)
|
|
final_attrs = dict(self.attrs, type='radio', name=self.name, value=self.choice_value)
|
|
if self.is_checked():
|
|
final_attrs['checked'] = 'checked'
|
|
return format_html('<input{0} />', flatatt(final_attrs))
|
|
|
|
@python_2_unicode_compatible
|
|
class RadioFieldRenderer(object):
|
|
"""
|
|
An object used by RadioSelect to enable customization of radio widgets.
|
|
"""
|
|
|
|
def __init__(self, name, value, attrs, choices):
|
|
self.name, self.value, self.attrs = name, value, attrs
|
|
self.choices = choices
|
|
|
|
def __iter__(self):
|
|
for i, choice in enumerate(self.choices):
|
|
yield RadioInput(self.name, self.value, self.attrs.copy(), choice, i)
|
|
|
|
def __getitem__(self, idx):
|
|
choice = self.choices[idx] # Let the IndexError propogate
|
|
return RadioInput(self.name, self.value, self.attrs.copy(), choice, idx)
|
|
|
|
def __str__(self):
|
|
return self.render()
|
|
|
|
def render(self):
|
|
"""Outputs a <ul> for this set of radio fields."""
|
|
return format_html('<ul>\n{0}\n</ul>',
|
|
format_html_join('\n', '<li>{0}</li>',
|
|
[(force_text(w),) for w in self]
|
|
))
|
|
|
|
class RadioSelect(Select):
|
|
renderer = RadioFieldRenderer
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
# Override the default renderer if we were passed one.
|
|
renderer = kwargs.pop('renderer', None)
|
|
if renderer:
|
|
self.renderer = renderer
|
|
super(RadioSelect, self).__init__(*args, **kwargs)
|
|
|
|
def subwidgets(self, name, value, attrs=None, choices=()):
|
|
for widget in self.get_renderer(name, value, attrs, choices):
|
|
yield widget
|
|
|
|
def get_renderer(self, name, value, attrs=None, choices=()):
|
|
"""Returns an instance of the renderer."""
|
|
if value is None: value = ''
|
|
str_value = force_text(value) # Normalize to string.
|
|
final_attrs = self.build_attrs(attrs)
|
|
choices = list(chain(self.choices, choices))
|
|
return self.renderer(name, str_value, final_attrs, choices)
|
|
|
|
def render(self, name, value, attrs=None, choices=()):
|
|
return self.get_renderer(name, value, attrs, choices).render()
|
|
|
|
def id_for_label(self, id_):
|
|
# RadioSelect is represented by multiple <input type="radio"> fields,
|
|
# each of which has a distinct ID. The IDs are made distinct by a "_X"
|
|
# suffix, where X is the zero-based index of the radio field. Thus,
|
|
# the label for a RadioSelect should reference the first one ('_0').
|
|
if id_:
|
|
id_ += '_0'
|
|
return id_
|
|
|
|
class CheckboxSelectMultiple(SelectMultiple):
|
|
def render(self, name, value, attrs=None, choices=()):
|
|
if value is None: value = []
|
|
has_id = attrs and 'id' in attrs
|
|
final_attrs = self.build_attrs(attrs, name=name)
|
|
output = ['<ul>']
|
|
# Normalize to strings
|
|
str_values = set([force_text(v) for v in value])
|
|
for i, (option_value, option_label) in enumerate(chain(self.choices, choices)):
|
|
# If an ID attribute was given, add a numeric index as a suffix,
|
|
# so that the checkboxes don't all have the same ID attribute.
|
|
if has_id:
|
|
final_attrs = dict(final_attrs, id='%s_%s' % (attrs['id'], i))
|
|
label_for = format_html(' for="{0}"', final_attrs['id'])
|
|
else:
|
|
label_for = ''
|
|
|
|
cb = CheckboxInput(final_attrs, check_test=lambda value: value in str_values)
|
|
option_value = force_text(option_value)
|
|
rendered_cb = cb.render(name, option_value)
|
|
option_label = force_text(option_label)
|
|
output.append(format_html('<li><label{0}>{1} {2}</label></li>',
|
|
label_for, rendered_cb, option_label))
|
|
output.append('</ul>')
|
|
return mark_safe('\n'.join(output))
|
|
|
|
def id_for_label(self, id_):
|
|
# See the comment for RadioSelect.id_for_label()
|
|
if id_:
|
|
id_ += '_0'
|
|
return id_
|
|
|
|
class MultiWidget(Widget):
|
|
"""
|
|
A widget that is composed of multiple widgets.
|
|
|
|
Its render() method is different than other widgets', because it has to
|
|
figure out how to split a single value for display in multiple widgets.
|
|
The ``value`` argument can be one of two things:
|
|
|
|
* A list.
|
|
* A normal value (e.g., a string) that has been "compressed" from
|
|
a list of values.
|
|
|
|
In the second case -- i.e., if the value is NOT a list -- render() will
|
|
first "decompress" the value into a list before rendering it. It does so by
|
|
calling the decompress() method, which MultiWidget subclasses must
|
|
implement. This method takes a single "compressed" value and returns a
|
|
list.
|
|
|
|
When render() does its HTML rendering, each value in the list is rendered
|
|
with the corresponding widget -- the first value is rendered in the first
|
|
widget, the second value is rendered in the second widget, etc.
|
|
|
|
Subclasses may implement format_output(), which takes the list of rendered
|
|
widgets and returns a string of HTML that formats them any way you'd like.
|
|
|
|
You'll probably want to use this class with MultiValueField.
|
|
"""
|
|
def __init__(self, widgets, attrs=None):
|
|
self.widgets = [isinstance(w, type) and w() or w for w in widgets]
|
|
super(MultiWidget, self).__init__(attrs)
|
|
|
|
def render(self, name, value, attrs=None):
|
|
if self.is_localized:
|
|
for widget in self.widgets:
|
|
widget.is_localized = self.is_localized
|
|
# value is a list of values, each corresponding to a widget
|
|
# in self.widgets.
|
|
if not isinstance(value, list):
|
|
value = self.decompress(value)
|
|
output = []
|
|
final_attrs = self.build_attrs(attrs)
|
|
id_ = final_attrs.get('id', None)
|
|
for i, widget in enumerate(self.widgets):
|
|
try:
|
|
widget_value = value[i]
|
|
except IndexError:
|
|
widget_value = None
|
|
if id_:
|
|
final_attrs = dict(final_attrs, id='%s_%s' % (id_, i))
|
|
output.append(widget.render(name + '_%s' % i, widget_value, final_attrs))
|
|
return mark_safe(self.format_output(output))
|
|
|
|
def id_for_label(self, id_):
|
|
# See the comment for RadioSelect.id_for_label()
|
|
if id_:
|
|
id_ += '_0'
|
|
return id_
|
|
|
|
def value_from_datadict(self, data, files, name):
|
|
return [widget.value_from_datadict(data, files, name + '_%s' % i) for i, widget in enumerate(self.widgets)]
|
|
|
|
def _has_changed(self, initial, data):
|
|
if initial is None:
|
|
initial = ['' for x in range(0, len(data))]
|
|
else:
|
|
if not isinstance(initial, list):
|
|
initial = self.decompress(initial)
|
|
for widget, initial, data in zip(self.widgets, initial, data):
|
|
if widget._has_changed(initial, data):
|
|
return True
|
|
return False
|
|
|
|
def format_output(self, rendered_widgets):
|
|
"""
|
|
Given a list of rendered widgets (as strings), returns a Unicode string
|
|
representing the HTML for the whole lot.
|
|
|
|
This hook allows you to format the HTML design of the widgets, if
|
|
needed.
|
|
"""
|
|
return ''.join(rendered_widgets)
|
|
|
|
def decompress(self, value):
|
|
"""
|
|
Returns a list of decompressed values for the given compressed value.
|
|
The given value can be assumed to be valid, but not necessarily
|
|
non-empty.
|
|
"""
|
|
raise NotImplementedError('Subclasses must implement this method.')
|
|
|
|
def _get_media(self):
|
|
"Media for a multiwidget is the combination of all media of the subwidgets"
|
|
media = Media()
|
|
for w in self.widgets:
|
|
media = media + w.media
|
|
return media
|
|
media = property(_get_media)
|
|
|
|
def __deepcopy__(self, memo):
|
|
obj = super(MultiWidget, self).__deepcopy__(memo)
|
|
obj.widgets = copy.deepcopy(self.widgets)
|
|
return obj
|
|
|
|
class SplitDateTimeWidget(MultiWidget):
|
|
"""
|
|
A Widget that splits datetime input into two <input type="text"> boxes.
|
|
"""
|
|
|
|
def __init__(self, attrs=None, date_format=None, time_format=None):
|
|
widgets = (DateInput(attrs=attrs, format=date_format),
|
|
TimeInput(attrs=attrs, format=time_format))
|
|
super(SplitDateTimeWidget, self).__init__(widgets, attrs)
|
|
|
|
def decompress(self, value):
|
|
if value:
|
|
value = to_current_timezone(value)
|
|
return [value.date(), value.time().replace(microsecond=0)]
|
|
return [None, None]
|
|
|
|
class SplitHiddenDateTimeWidget(SplitDateTimeWidget):
|
|
"""
|
|
A Widget that splits datetime input into two <input type="hidden"> inputs.
|
|
"""
|
|
is_hidden = True
|
|
|
|
def __init__(self, attrs=None, date_format=None, time_format=None):
|
|
super(SplitHiddenDateTimeWidget, self).__init__(attrs, date_format, time_format)
|
|
for widget in self.widgets:
|
|
widget.input_type = 'hidden'
|
|
widget.is_hidden = True
|