web/action.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 26 Aug 2009 14:45:56 +0200
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backport 3.5 step 1, remaining wf changes in hooks to merge
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"""abstract action classes for CubicWeb web client
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from cubicweb import target
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from cubicweb.selectors import (partial_relation_possible, match_search_state,
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                                one_line_rset, partial_may_add_relation, yes)
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from cubicweb.appobject import AppObject
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class Action(AppObject):
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    """abstract action. Handle the .search_states attribute to match
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    request search state.
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    """
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    __registry__ = 'actions'
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    __select__ = match_search_state('normal')
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    cw_property_defs = {
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        'visible':  dict(type='Boolean', default=True,
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                         help=_('display the action or not')),
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        'order':    dict(type='Int', default=99,
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                         help=_('display order of the action')),
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        'category': dict(type='String', default='moreactions',
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                         vocabulary=('mainactions', 'moreactions', 'addrelated',
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                                     'useractions', 'siteactions', 'hidden'),
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                         help=_('context where this component should be displayed')),
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    }
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    site_wide = True # don't want user to configuration actions eproperties
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    category = 'moreactions'
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    def url(self):
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        """return the url associated with this action"""
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        raise NotImplementedError
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    def html_class(self):
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        if self.req.selected(self.url()):
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            return 'selected'
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        if self.category:
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            return 'box' + self.category.capitalize()
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class UnregisteredAction(Action):
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    """non registered action used to build boxes. Unless you set them
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    explicitly, .vreg and .schema attributes at least are None.
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    """
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    category = None
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    id = None
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    def __init__(self, req, rset, title, path, **kwargs):
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        Action.__init__(self, req, rset=rset)
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        self.title = req._(title)
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        self._path = path
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        self.__dict__.update(kwargs)
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    def url(self):
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        return self._path
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class LinkToEntityAction(Action):
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    """base class for actions consisting to create a new object
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    with an initial relation set to an entity.
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    Additionaly to EntityAction behaviour, this class is parametrized
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    using .etype, .rtype and .target attributes to check if the
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    action apply and if the logged user has access to it
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    """
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    __select__ = (match_search_state('normal') & one_line_rset()
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                  & partial_relation_possible(action='add')
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                  & partial_may_add_relation())
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    category = 'addrelated'
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    def url(self):
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        current_entity = self.rset.get_entity(self.row or 0, self.col or 0)
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        linkto = '%s:%s:%s' % (self.rtype, current_entity.eid, target(self))
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        return self.build_url(vid='creation', etype=self.etype,
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                              __linkto=linkto,
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                              __redirectpath=current_entity.rest_path(), # should not be url quoted!
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                              __redirectvid=self.req.form.get('__redirectvid', ''))
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