"""some base form classes for CubicWeb web client
:organization: Logilab
:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
__docformat__ = "restructuredtext en"
from warnings import warn
from logilab.common.compat import any
from logilab.common.deprecation import deprecated
from cubicweb.selectors import non_final_entity, match_kwargs, one_line_rset
from cubicweb.web import INTERNAL_FIELD_VALUE, eid_param
from cubicweb.web import form, formwidgets as fwdgs
from cubicweb.web.controller import NAV_FORM_PARAMETERS
from cubicweb.web.formfields import StringField
class FieldsForm(form.Form):
"""base class for fields based forms.
The following attributes may be either set on subclasses or given on
form selection to customize the generated form:
* `needs_js`: sequence of javascript files that should be added to handle
this form (through `req.add_js`)
* `needs_css`: sequence of css files that should be added to handle this
form (through `req.add_css`)
* `domid`: value for the "id" attribute of the <form> tag
* `action`: value for the "action" attribute of the <form> tag
* `onsubmit`: value for the "onsubmit" attribute of the <form> tag
* `cssclass`: value for the "class" attribute of the <form> tag
* `cssstyle`: value for the "style" attribute of the <form> tag
* `cwtarget`: value for the "cubicweb:target" attribute of the <form> tag
* `redirect_path`: relative to redirect to after submitting the form
* `copy_nav_params`: flag telling if navigation paramenters should be copied
back in hidden input
* `form_buttons`: form buttons sequence (button widgets instances)
* `form_renderer_id`: id of the form renderer to use to render the form
* `fieldsets_in_order`: fieldset name sequence, to control order
"""
__regid__ = 'base'
internal_fields = ('__errorurl',) + NAV_FORM_PARAMETERS
# attributes overrideable by subclasses or through __init__
needs_js = ('cubicweb.ajax.js', 'cubicweb.edition.js',)
needs_css = ('cubicweb.form.css',)
domid = 'form'
action = None
onsubmit = "return freezeFormButtons('%(domid)s');"
cssclass = None
cssstyle = None
cwtarget = None
redirect_path = None
copy_nav_params = False
form_buttons = None
form_renderer_id = 'default'
fieldsets_in_order = None
def __init__(self, req, rset=None, row=None, col=None,
submitmsg=None, mainform=True,
**kwargs):
super(FieldsForm, self).__init__(req, rset=rset, row=row, col=col)
self.fields = list(self.__class__._fields_)
for key, val in kwargs.items():
if key in NAV_FORM_PARAMETERS:
self.form_add_hidden(key, val)
elif hasattr(self.__class__, key) and not key[0] == '_':
setattr(self, key, val)
else:
self.cw_extra_kwargs[key] = val
# skip other parameters, usually given for selection
# (else write a custom class to handle them)
if mainform:
self.form_add_hidden('__errorurl', self.session_key())
self.form_add_hidden('__domid', self.domid)
self.restore_previous_post(self.session_key())
# XXX why do we need two different variables (mainform and copy_nav_params ?)
if self.copy_nav_params:
for param in NAV_FORM_PARAMETERS:
if not param in kwargs:
value = req.form.get(param)
if value:
self.form_add_hidden(param, value)
if submitmsg is not None:
self.form_add_hidden('__message', submitmsg)
self.context = None
if 'domid' in kwargs:# session key changed
self.restore_previous_post(self.session_key())
@property
def form_needs_multipart(self):
"""true if the form needs enctype=multipart/form-data"""
return any(field.needs_multipart for field in self.fields)
def form_add_hidden(self, name, value=None, **kwargs):
"""add an hidden field to the form"""
kwargs.setdefault('widget', fwdgs.HiddenInput)
field = StringField(name=name, initial=value, **kwargs)
if 'id' in kwargs:
# by default, hidden input don't set id attribute. If one is
# explicitly specified, ensure it will be set
field.widget.setdomid = True
self.append_field(field)
return field
def add_media(self):
"""adds media (CSS & JS) required by this widget"""
if self.needs_js:
self._cw.add_js(self.needs_js)
if self.needs_css:
self._cw.add_css(self.needs_css)
def render(self, formvalues=None, rendervalues=None, renderer=None):
"""render this form, using the renderer given in args or the default
FormRenderer()
"""
self.build_context(formvalues or {})
if renderer is None:
renderer = self.form_default_renderer()
return renderer.render(self, rendervalues or {})
def form_default_renderer(self):
return self._cw.vreg['formrenderers'].select(self.form_renderer_id,
self._cw, rset=self.cw_rset,
row=self.cw_row, col=self.cw_col)
def build_context(self, rendervalues=None):
"""build form context values (the .context attribute which is a
dictionary with field instance as key associated to a dictionary
containing field 'name' (qualified), 'id', 'value' (for display, always
a string).
rendervalues is an optional dictionary containing extra form values
given to render()
"""
if self.context is not None:
return # already built
self.context = context = {}
# ensure rendervalues is a dict
if rendervalues is None:
rendervalues = {}
# use a copy in case fields are modified while context is build (eg
# __linkto handling for instance)
for field in self.fields[:]:
for field in field.actual_fields(self):
field.form_init(self)
value = self.form_field_display_value(field, rendervalues)
context[field] = {'value': value,
'name': self.form_field_name(field),
'id': self.form_field_id(field),
}
def form_field_display_value(self, field, rendervalues, load_bytes=False):
"""return field's *string* value to use for display
looks in
1. previously submitted form values if any (eg on validation error)
2. req.form
3. extra kw args given to render_form
4. field's typed value
values found in 1. and 2. are expected te be already some 'display'
value while those found in 3. and 4. are expected to be correctly typed.
"""
value = self._req_display_value(field)
if value is None:
if field.name in rendervalues:
value = rendervalues[field.name]
elif field.name in self.cw_extra_kwargs:
value = self.cw_extra_kwargs[field.name]
else:
value = self.form_field_value(field, load_bytes)
if callable(value):
value = value(self)
if value != INTERNAL_FIELD_VALUE:
value = field.format_value(self._cw, value)
return value
def _req_display_value(self, field):
qname = self.form_field_name(field)
if qname in self.form_previous_values:
return self.form_previous_values[qname]
if qname in self._cw.form:
return self._cw.form[qname]
if field.name in self._cw.form:
return self._cw.form[field.name]
return None
def form_field_value(self, field, load_bytes=False):
"""return field's *typed* value"""
myattr = '%s_%s_default' % (field.role, field.name)
if hasattr(self, myattr):
return getattr(self, myattr)()
value = field.initial
if callable(value):
value = value(self)
return value
def form_field_error(self, field):
"""return validation error for widget's field, if any"""
if self._field_has_error(field):
self.form_displayed_errors.add(field.name)
return u'<span class="error">%s</span>' % self.form_valerror.errors[field.name]
return u''
def form_field_format(self, field):
"""return MIME type used for the given (text or bytes) field"""
return self._cw.property_value('ui.default-text-format')
def form_field_encoding(self, field):
"""return encoding used for the given (text) field"""
return self._cw.encoding
def form_field_name(self, field):
"""return qualified name for the given field"""
return field.name
def form_field_id(self, field):
"""return dom id for the given field"""
return field.id
def form_field_vocabulary(self, field, limit=None):
"""return vocabulary for the given field. Should be overriden in
specific forms using fields which requires some vocabulary
"""
raise NotImplementedError
def form_field_modified(self, field):
return field.is_visible()
def _field_has_error(self, field):
"""return true if the field has some error in given validation exception
"""
return self.form_valerror and field.name in self.form_valerror.errors
@deprecated('use .render(formvalues, rendervalues)')
def form_render(self, **values):
"""render this form, using the renderer given in args or the default
FormRenderer()
"""
self.build_context(values)
renderer = values.pop('renderer', None)
if renderer is None:
renderer = self.form_default_renderer()
return renderer.render(self, values)
class EntityFieldsForm(FieldsForm):
__regid__ = 'base'
__select__ = (match_kwargs('entity')
| (one_line_rset() & non_final_entity()))
internal_fields = FieldsForm.internal_fields + ('__type', 'eid', '__maineid')
domid = 'entityForm'
def __init__(self, *args, **kwargs):
self.edited_entity = kwargs.pop('entity', None)
msg = kwargs.pop('submitmsg', None)
super(EntityFieldsForm, self).__init__(*args, **kwargs)
if self.edited_entity is None:
self.edited_entity = self.cw_rset.complete_entity(self.cw_row or 0, self.cw_col or 0)
self.form_add_hidden('__type', eidparam=True)
self.form_add_hidden('eid')
if kwargs.get('mainform', True): # mainform default to true in parent
self.form_add_hidden(u'__maineid', self.edited_entity.eid)
# If we need to directly attach the new object to another one
if self._cw.list_form_param('__linkto'):
for linkto in self._cw.list_form_param('__linkto'):
self.form_add_hidden('__linkto', linkto)
if msg:
msg = '%s %s' % (msg, self._cw._('and linked'))
else:
msg = self._cw._('entity linked')
if msg:
self.form_add_hidden('__message', msg)
def session_key(self):
"""return the key that may be used to store / retreive data about a
previous post which failed because of a validation error
"""
try:
return self.force_session_key
except AttributeError:
# XXX if this is a json request, suppose we should redirect to the
# entity primary view
if self.req.json_request:
return '%s#%s' % (self.edited_entity.absolute_url(), self.domid)
return '%s#%s' % (self.req.url(), self.domid)
def _field_has_error(self, field):
"""return true if the field has some error in given validation exception
"""
return super(EntityFieldsForm, self)._field_has_error(field) \
and self.form_valerror.eid == self.edited_entity.eid
def _relation_vocabulary(self, rtype, targettype, role,
limit=None, done=None):
"""return unrelated entities for a given relation and target entity type
for use in vocabulary
"""
if done is None:
done = set()
rset = self.edited_entity.unrelated(rtype, targettype, role, limit)
res = []
for entity in rset.entities():
if entity.eid in done:
continue
done.add(entity.eid)
res.append((entity.view('combobox'), entity.eid))
return res
def _req_display_value(self, field):
value = super(EntityFieldsForm, self)._req_display_value(field)
if value is None:
value = self.edited_entity.linked_to(field.name, field.role)
if value:
searchedvalues = ['%s:%s:%s' % (field.name, eid, field.role)
for eid in value]
# remove associated __linkto hidden fields
for field in self.root_form.fields_by_name('__linkto'):
if field.initial in searchedvalues:
self.root_form.remove_field(field)
else:
value = None
return value
def _form_field_default_value(self, field, load_bytes):
defaultattr = 'default_%s' % field.name
if hasattr(self.edited_entity, defaultattr):
# XXX bw compat, default_<field name> on the entity
warn('found %s on %s, should be set on a specific form'
% (defaultattr, self.edited_entity.__regid__), DeprecationWarning)
value = getattr(self.edited_entity, defaultattr)
if callable(value):
value = value()
else:
value = super(EntityFieldsForm, self).form_field_value(field,
load_bytes)
return value
def form_default_renderer(self):
return self._cw.vreg['formrenderers'].select(
self.form_renderer_id, self._cw, rset=self.cw_rset, row=self.cw_row,
col=self.cw_col, entity=self.edited_entity)
def form_field_value(self, field, load_bytes=False):
"""return field's *typed* value
overriden to deal with
* special eid / __type
* lookup for values on edited entities
"""
attr = field.name
entity = self.edited_entity
if attr == 'eid':
return entity.eid
if not field.eidparam:
return super(EntityFieldsForm, self).form_field_value(field, load_bytes)
if attr == '__type':
return entity.__regid__
if self._cw.vreg.schema.rschema(attr).final:
attrtype = entity.e_schema.destination(attr)
if attrtype == 'Password':
return entity.has_eid() and INTERNAL_FIELD_VALUE or ''
if attrtype == 'Bytes':
if entity.has_eid():
if load_bytes:
return getattr(entity, attr)
# XXX value should reflect if some file is already attached
return True
return False
if entity.has_eid() or attr in entity:
value = getattr(entity, attr)
else:
value = self._form_field_default_value(field, load_bytes)
return value
# non final relation field
if entity.has_eid() or entity.relation_cached(attr, field.role):
value = [r[0] for r in entity.related(attr, field.role)]
else:
value = self._form_field_default_value(field, load_bytes)
return value
def form_field_format(self, field):
"""return MIME type used for the given (text or bytes) field"""
entity = self.edited_entity
if field.eidparam and entity.e_schema.has_metadata(field.name, 'format') and (
entity.has_eid() or '%s_format' % field.name in entity):
return self.edited_entity.attr_metadata(field.name, 'format')
return self._cw.property_value('ui.default-text-format')
def form_field_encoding(self, field):
"""return encoding used for the given (text) field"""
entity = self.edited_entity
if field.eidparam and entity.e_schema.has_metadata(field.name, 'encoding') and (
entity.has_eid() or '%s_encoding' % field.name in entity):
return self.edited_entity.attr_metadata(field.name, 'encoding')
return super(EntityFieldsForm, self).form_field_encoding(field)
def form_field_name(self, field):
"""return qualified name for the given field"""
if field.eidparam:
return eid_param(field.name, self.edited_entity.eid)
return field.name
def form_field_id(self, field):
"""return dom id for the given field"""
if field.eidparam:
return eid_param(field.id, self.edited_entity.eid)
return field.id
# XXX all this vocabulary handling should be on the field, no?
def form_field_vocabulary(self, field, limit=None):
"""return vocabulary for the given field"""
role, rtype = field.role, field.name
method = '%s_%s_vocabulary' % (role, rtype)
try:
vocabfunc = getattr(self, method)
except AttributeError:
try:
# XXX bw compat, <role>_<rtype>_vocabulary on the entity
vocabfunc = getattr(self.edited_entity, method)
except AttributeError:
vocabfunc = getattr(self, '%s_relation_vocabulary' % role)
else:
warn('found %s on %s, should be set on a specific form'
% (method, self.edited_entity.__regid__), DeprecationWarning)
# NOTE: it is the responsibility of `vocabfunc` to sort the result
# (direclty through RQL or via a python sort). This is also
# important because `vocabfunc` might return a list with
# couples (label, None) which act as separators. In these
# cases, it doesn't make sense to sort results afterwards.
return vocabfunc(rtype, limit)
def form_field_modified(self, field):
if field.is_visible():
# fields not corresponding to an entity attribute / relations
# are considered modified
if not field.eidparam or not self.edited_entity.has_eid():
return True # XXX
try:
if field.role == 'subject':
previous_value = getattr(self.edited_entity, field.name)
else:
previous_value = getattr(self.edited_entity,
'reverse_%s' % field.name)
except AttributeError:
# fields with eidparam=True but not corresponding to an actual
# attribute or relation
return True
# if it's a non final relation, we need the eids
if isinstance(previous_value, list):
# widget should return untyped eids
previous_value = set(unicode(e.eid) for e in previous_value)
new_value = field.process_form_value(self)
if self.edited_entity.has_eid() and (previous_value == new_value):
return False # not modified
return True
return False
def subject_relation_vocabulary(self, rtype, limit=None):
"""defaut vocabulary method for the given relation, looking for
relation's object entities (i.e. self is the subject)
"""
entity = self.edited_entity
if isinstance(rtype, basestring):
rtype = self._cw.vreg.schema.rschema(rtype)
done = None
assert not rtype.final, rtype
if entity.has_eid():
done = set(e.eid for e in getattr(entity, str(rtype)))
result = []
rsetsize = None
for objtype in rtype.objects(entity.e_schema):
if limit is not None:
rsetsize = limit - len(result)
result += self._relation_vocabulary(rtype, objtype, 'subject',
rsetsize, done)
if limit is not None and len(result) >= limit:
break
return result
def object_relation_vocabulary(self, rtype, limit=None):
"""defaut vocabulary method for the given relation, looking for
relation's subject entities (i.e. self is the object)
"""
entity = self.edited_entity
if isinstance(rtype, basestring):
rtype = self._cw.vreg.schema.rschema(rtype)
done = None
if entity.has_eid():
done = set(e.eid for e in getattr(entity, 'reverse_%s' % rtype))
result = []
rsetsize = None
for subjtype in rtype.subjects(entity.e_schema):
if limit is not None:
rsetsize = limit - len(result)
result += self._relation_vocabulary(rtype, subjtype, 'object',
rsetsize, done)
if limit is not None and len(result) >= limit:
break
return result
def editable_relations(self):
return ()
def should_display_add_new_relation_link(self, rschema, existant, card):
return False
class CompositeFormMixIn(object):
"""form composed of sub-forms"""
__regid__ = 'composite'
form_renderer_id = __regid__
def __init__(self, *args, **kwargs):
super(CompositeFormMixIn, self).__init__(*args, **kwargs)
self.forms = []
def add_subform(self, subform):
"""mark given form as a subform and append it"""
subform.parent_form = self
self.forms.append(subform)
def build_context(self, rendervalues=None):
super(CompositeFormMixIn, self).build_context(rendervalues)
for form in self.forms:
form.build_context(rendervalues)
class CompositeForm(CompositeFormMixIn, FieldsForm):
pass
class CompositeEntityForm(CompositeFormMixIn, EntityFieldsForm):
pass # XXX why is this class necessary?