"""abstract 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 logilab.common.decorators import iclassmethod
from cubicweb.appobject import AppObject
from cubicweb.view import NOINDEX, NOFOLLOW
from cubicweb.common import tags
from cubicweb.web import stdmsgs, httpcache, formfields
class FormViewMixIn(object):
"""abstract form view mix-in"""
category = 'form'
http_cache_manager = httpcache.NoHTTPCacheManager
add_to_breadcrumbs = False
def html_headers(self):
"""return a list of html headers (eg something to be inserted between
<head> and </head> of the returned page
by default forms are neither indexed nor followed
"""
return [NOINDEX, NOFOLLOW]
def linkable(self):
"""override since forms are usually linked by an action,
so we don't want them to be listed by appli.possible_views
"""
return False
class metafieldsform(type):
"""metaclass for FieldsForm to retrieve fields defined as class attributes
and put them into a single ordered list: '_fields_'.
"""
def __new__(mcs, name, bases, classdict):
allfields = []
for base in bases:
if hasattr(base, '_fields_'):
allfields += base._fields_
clsfields = (item for item in classdict.items()
if isinstance(item[1], formfields.Field))
for fieldname, field in sorted(clsfields, key=lambda x: x[1].creation_rank):
if not field.name:
field.set_name(fieldname)
allfields.append(field)
classdict['_fields_'] = allfields
return super(metafieldsform, mcs).__new__(mcs, name, bases, classdict)
class FieldNotFound(Exception):
"""raised by field_by_name when a field with the given name has not been
found
"""
class Form(AppObject):
__metaclass__ = metafieldsform
__registry__ = 'forms'
parent_form = None
def __init__(self, req, rset, **kwargs):
super(Form, self).__init__(req, rset=rset, **kwargs)
self.restore_previous_post(self.session_key())
@property
def root_form(self):
"""return the root form"""
if self.parent_form is None:
return self
return self.parent_form.root_form
@iclassmethod
def _fieldsattr(cls_or_self):
if isinstance(cls_or_self, type):
fields = cls_or_self._fields_
else:
fields = cls_or_self.fields
return fields
@iclassmethod
def field_by_name(cls_or_self, name, role='subject'):
"""return field with the given name and role.
Raise FieldNotFound if the field can't be found.
"""
for field in cls_or_self._fieldsattr():
if field.name == name and field.role == role:
return field
raise FieldNotFound(name)
@iclassmethod
def fields_by_name(cls_or_self, name, role='subject'):
"""return a list of fields with the given name and role"""
return [field for field in cls_or_self._fieldsattr()
if field.name == name and field.role == role]
@iclassmethod
def remove_field(cls_or_self, field):
"""remove a field from form class or instance"""
cls_or_self._fieldsattr().remove(field)
@iclassmethod
def append_field(cls_or_self, field):
"""append a field to form class or instance"""
cls_or_self._fieldsattr().append(field)
@iclassmethod
def insert_field_before(cls_or_self, new_field, name, role='subject'):
field = cls_or_self.field_by_name(name, role)
fields = cls_or_self._fieldsattr()
fields.insert(fields.index(field), new_field)
@iclassmethod
def insert_field_after(cls_or_self, new_field, name, role='subject'):
field = cls_or_self.field_by_name(name, role)
fields = cls_or_self._fieldsattr()
fields.insert(fields.index(field)+1, new_field)
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
"""
return '%s#%s' % (self._cw.url(), self.domid)
def restore_previous_post(self, sessionkey):
# get validation session data which may have been previously set.
# deleting validation errors here breaks form reloading (errors are
# no more available), they have to be deleted by application's publish
# method on successful commit
forminfo = self._cw.get_session_data(sessionkey, pop=True)
if forminfo:
# XXX remove req.data assigment once cw.web.widget is killed
self._cw.data['formvalues'] = self.form_previous_values = forminfo['values']
self._cw.data['formerrors'] = self.form_valerror = forminfo['errors']
self._cw.data['displayederrors'] = self.form_displayed_errors = set()
# if some validation error occured on entity creation, we have to
# get the original variable name from its attributed eid
foreid = self.form_valerror.entity
for var, eid in forminfo['eidmap'].items():
if foreid == eid:
self.form_valerror.eid = var
break
else:
self.form_valerror.eid = foreid
else:
self.form_previous_values = {}
self.form_valerror = None