654 lines
24 KiB
Python
654 lines
24 KiB
Python
"""
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HTML Widget classes
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"""
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try:
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set
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except NameError:
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from sets import Set as set # Python 2.3 fallback
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import copy
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from itertools import chain
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from django.conf import settings
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from django.utils.datastructures import MultiValueDict
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from django.utils.html import escape, conditional_escape
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from django.utils.translation import ugettext
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from django.utils.encoding import StrAndUnicode, force_unicode
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from django.utils.safestring import mark_safe
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from django.utils import datetime_safe
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from util import flatatt
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from urlparse import urljoin
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__all__ = (
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'Media', 'MediaDefiningClass', 'Widget', 'TextInput', 'PasswordInput',
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'HiddenInput', 'MultipleHiddenInput',
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'FileInput', 'DateTimeInput', 'Textarea', 'CheckboxInput',
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'Select', 'NullBooleanSelect', 'SelectMultiple', 'RadioSelect',
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'CheckboxSelectMultiple', 'MultiWidget', 'SplitDateTimeWidget',
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)
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MEDIA_TYPES = ('css','js')
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class Media(StrAndUnicode):
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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 __unicode__(self):
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return self.render()
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def render(self):
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return mark_safe(u'\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 [u'<script type="text/javascript" src="%s"></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 = self._css.keys()
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media.sort()
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return chain(*[
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[u'<link href="%s" type="text/css" media="%s" 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):
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if path.startswith(u'http://') or path.startswith(u'https://') or path.startswith(u'/'):
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return path
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return urljoin(settings.MEDIA_URL,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(**{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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self._js.extend([path for path in data if path not in self._js])
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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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self._css.setdefault(medium, []).extend([path for path in paths if path not in self._css[medium]])
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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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if hasattr(super(cls, self), 'media'):
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base = super(cls, self).media
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else:
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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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class Widget(object):
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__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-encrypted form
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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 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/ u''.
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if data is None:
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data_value = u''
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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 = u''
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else:
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initial_value = initial
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if force_unicode(initial_value) != force_unicode(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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id_for_label = classmethod(id_for_label)
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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 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, 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_unicode(value)
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return mark_safe(u'<input%s />' % flatatt(final_attrs))
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class TextInput(Input):
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input_type = 'text'
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class PasswordInput(Input):
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input_type = 'password'
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def __init__(self, attrs=None, render_value=True):
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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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return mark_safe(u'\n'.join([(u'<input%s />' %
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flatatt(dict(value=force_unicode(v), **final_attrs)))
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for v in value]))
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def value_from_datadict(self, data, files, name):
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if isinstance(data, MultiValueDict):
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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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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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self.attrs = {'cols': '40', 'rows': '10'}
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if attrs:
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self.attrs.update(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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value = force_unicode(value)
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final_attrs = self.build_attrs(attrs, name=name)
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return mark_safe(u'<textarea%s>%s</textarea>' % (flatatt(final_attrs),
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conditional_escape(force_unicode(value))))
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class DateTimeInput(Input):
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input_type = 'text'
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format = '%Y-%m-%d %H:%M:%S' # '2006-10-25 14:30:59'
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def __init__(self, attrs=None, format=None):
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super(DateTimeInput, self).__init__(attrs)
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if format:
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self.format = format
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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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elif hasattr(value, 'strftime'):
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value = datetime_safe.new_datetime(value)
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value = value.strftime(self.format)
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return super(DateTimeInput, self).render(name, value, attrs)
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class CheckboxInput(Widget):
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def __init__(self, attrs=None, check_test=bool):
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super(CheckboxInput, self).__init__(attrs)
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# check_test is a callable that takes a value and returns True
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# if the checkbox should be checked for that value.
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self.check_test = check_test
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def render(self, name, value, attrs=None):
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final_attrs = self.build_attrs(attrs, type='checkbox', name=name)
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try:
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result = self.check_test(value)
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except: # Silently catch exceptions
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result = False
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if result:
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final_attrs['checked'] = 'checked'
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if value not in ('', True, False, None):
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# Only add the 'value' attribute if a value is non-empty.
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final_attrs['value'] = force_unicode(value)
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return mark_safe(u'<input%s />' % flatatt(final_attrs))
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def value_from_datadict(self, data, files, name):
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if name not in data:
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# A missing value means False because HTML form submission does not
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# send results for unselected checkboxes.
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return False
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return super(CheckboxInput, self).value_from_datadict(data, files, name)
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def _has_changed(self, initial, data):
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# Sometimes data or initial could be None or u'' which should be the
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# same thing as False.
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return bool(initial) != bool(data)
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class Select(Widget):
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def __init__(self, attrs=None, choices=()):
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super(Select, self).__init__(attrs)
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# choices can be any iterable, but we may need to render this widget
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# multiple times. Thus, collapse it into a list so it can be consumed
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# more than once.
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self.choices = list(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, name=name)
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output = [u'<select%s>' % flatatt(final_attrs)]
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options = self.render_options(choices, [value])
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if options:
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output.append(options)
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output.append('</select>')
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return mark_safe(u'\n'.join(output))
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def render_options(self, choices, selected_choices):
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def render_option(option_value, option_label):
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option_value = force_unicode(option_value)
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selected_html = (option_value in selected_choices) and u' selected="selected"' or ''
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return u'<option value="%s"%s>%s</option>' % (
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escape(option_value), selected_html,
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conditional_escape(force_unicode(option_label)))
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# Normalize to strings.
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selected_choices = set([force_unicode(v) for v in selected_choices])
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output = []
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for option_value, option_label in chain(self.choices, choices):
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if isinstance(option_label, (list, tuple)):
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output.append(u'<optgroup label="%s">' % escape(force_unicode(option_value)))
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for option in option_label:
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output.append(render_option(*option))
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output.append(u'</optgroup>')
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else:
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output.append(render_option(option_value, option_label))
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return u'\n'.join(output)
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class NullBooleanSelect(Select):
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"""
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A Select Widget intended to be used with NullBooleanField.
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"""
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def __init__(self, attrs=None):
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choices = ((u'1', ugettext('Unknown')), (u'2', ugettext('Yes')), (u'3', ugettext('No')))
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super(NullBooleanSelect, self).__init__(attrs, choices)
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def render(self, name, value, attrs=None, choices=()):
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try:
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value = {True: u'2', False: u'3', u'2': u'2', u'3': u'3'}[value]
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except KeyError:
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value = u'1'
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return super(NullBooleanSelect, self).render(name, value, attrs, choices)
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def value_from_datadict(self, data, files, name):
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value = data.get(name, None)
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return {u'2': True, u'3': False, True: True, False: False}.get(value, None)
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def _has_changed(self, initial, data):
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# Sometimes data or initial could be None or u'' which should be the
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# same thing as False.
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return bool(initial) != bool(data)
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class SelectMultiple(Select):
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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, name=name)
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output = [u'<select multiple="multiple"%s>' % flatatt(final_attrs)]
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options = self.render_options(choices, value)
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if options:
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output.append(options)
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output.append('</select>')
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return mark_safe(u'\n'.join(output))
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def value_from_datadict(self, data, files, name):
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if isinstance(data, MultiValueDict):
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return data.getlist(name)
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return data.get(name, None)
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def _has_changed(self, initial, data):
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if initial is None:
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initial = []
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if data is None:
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data = []
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if len(initial) != len(data):
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return True
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for value1, value2 in zip(initial, data):
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if force_unicode(value1) != force_unicode(value2):
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return True
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return False
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class RadioInput(StrAndUnicode):
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"""
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An object used by RadioFieldRenderer that represents a single
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<input type='radio'>.
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"""
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def __init__(self, name, value, attrs, choice, index):
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self.name, self.value = name, value
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self.attrs = attrs
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self.choice_value = force_unicode(choice[0])
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self.choice_label = force_unicode(choice[1])
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self.index = index
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def __unicode__(self):
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if 'id' in self.attrs:
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label_for = ' for="%s_%s"' % (self.attrs['id'], self.index)
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else:
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label_for = ''
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choice_label = conditional_escape(force_unicode(self.choice_label))
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return mark_safe(u'<label%s>%s %s</label>' % (label_for, self.tag(), choice_label))
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def is_checked(self):
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return self.value == self.choice_value
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def tag(self):
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if 'id' in self.attrs:
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self.attrs['id'] = '%s_%s' % (self.attrs['id'], self.index)
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final_attrs = dict(self.attrs, type='radio', name=self.name, value=self.choice_value)
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if self.is_checked():
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final_attrs['checked'] = 'checked'
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return mark_safe(u'<input%s />' % flatatt(final_attrs))
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class RadioFieldRenderer(StrAndUnicode):
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"""
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An object used by RadioSelect to enable customization of radio widgets.
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"""
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def __init__(self, name, value, attrs, choices):
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self.name, self.value, self.attrs = name, value, attrs
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self.choices = choices
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def __iter__(self):
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for i, choice in enumerate(self.choices):
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yield RadioInput(self.name, self.value, self.attrs.copy(), choice, i)
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def __getitem__(self, idx):
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choice = self.choices[idx] # Let the IndexError propogate
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return RadioInput(self.name, self.value, self.attrs.copy(), choice, idx)
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def __unicode__(self):
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return self.render()
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def render(self):
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"""Outputs a <ul> for this set of radio fields."""
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return mark_safe(u'<ul>\n%s\n</ul>' % u'\n'.join([u'<li>%s</li>'
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% force_unicode(w) for w in self]))
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class RadioSelect(Select):
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renderer = RadioFieldRenderer
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def __init__(self, *args, **kwargs):
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# Override the default renderer if we were passed one.
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renderer = kwargs.pop('renderer', None)
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if renderer:
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self.renderer = renderer
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super(RadioSelect, self).__init__(*args, **kwargs)
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def get_renderer(self, name, value, attrs=None, choices=()):
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"""Returns an instance of the renderer."""
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if value is None: value = ''
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str_value = force_unicode(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_
|
|
id_for_label = classmethod(id_for_label)
|
|
|
|
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 = [u'<ul>']
|
|
# Normalize to strings
|
|
str_values = set([force_unicode(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 = u' for="%s"' % final_attrs['id']
|
|
else:
|
|
label_for = ''
|
|
|
|
cb = CheckboxInput(final_attrs, check_test=lambda value: value in str_values)
|
|
option_value = force_unicode(option_value)
|
|
rendered_cb = cb.render(name, option_value)
|
|
option_label = conditional_escape(force_unicode(option_label))
|
|
output.append(u'<li><label%s>%s %s</label></li>' % (label_for, rendered_cb, option_label))
|
|
output.append(u'</ul>')
|
|
return mark_safe(u'\n'.join(output))
|
|
|
|
def id_for_label(self, id_):
|
|
# See the comment for RadioSelect.id_for_label()
|
|
if id_:
|
|
id_ += '_0'
|
|
return id_
|
|
id_for_label = classmethod(id_for_label)
|
|
|
|
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):
|
|
# 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_
|
|
id_for_label = classmethod(id_for_label)
|
|
|
|
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 = [u'' for x in range(0, len(data))]
|
|
else:
|
|
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 u''.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)
|
|
|
|
class SplitDateTimeWidget(MultiWidget):
|
|
"""
|
|
A Widget that splits datetime input into two <input type="text"> boxes.
|
|
"""
|
|
def __init__(self, attrs=None):
|
|
widgets = (TextInput(attrs=attrs), TextInput(attrs=attrs))
|
|
super(SplitDateTimeWidget, self).__init__(widgets, attrs)
|
|
|
|
def decompress(self, value):
|
|
if value:
|
|
return [value.date(), value.time().replace(microsecond=0)]
|
|
return [None, None]
|
|
|