diff -r 058bb3dc685f -r 0b59724cb3f2 web/component.py
--- a/web/component.py	Mon Jan 04 18:40:30 2016 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,752 +0,0 @@
-# copyright 2003-2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
-# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
-#
-# This file is part of CubicWeb.
-#
-# CubicWeb is free software: you can redistribute it and/or modify it under the
-# terms of the GNU Lesser General Public License as published by the Free
-# Software Foundation, either version 2.1 of the License, or (at your option)
-# any later version.
-#
-# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
-# details.
-#
-# You should have received a copy of the GNU Lesser General Public License along
-# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
-"""abstract component class and base components definition for CubicWeb web
-client
-"""
-
-__docformat__ = "restructuredtext en"
-from cubicweb import _
-
-from warnings import warn
-
-from six import PY3, add_metaclass, text_type
-
-from logilab.common.deprecation import class_deprecated, class_renamed, deprecated
-from logilab.mtconverter import xml_escape
-
-from cubicweb import Unauthorized, role, target, tags
-from cubicweb.schema import display_name
-from cubicweb.uilib import js, domid
-from cubicweb.utils import json_dumps, js_href
-from cubicweb.view import ReloadableMixIn, Component
-from cubicweb.predicates import (no_cnx, paginated_rset, one_line_rset,
-                                non_final_entity, partial_relation_possible,
-                                partial_has_related_entities)
-from cubicweb.appobject import AppObject
-from cubicweb.web import INTERNAL_FIELD_VALUE, stdmsgs
-
-
-# abstract base class for navigation components ################################
-
-class NavigationComponent(Component):
-    """abstract base class for navigation components"""
-    __regid__ = 'navigation'
-    __select__ = paginated_rset()
-
-    cw_property_defs = {
-        _('visible'):  dict(type='Boolean', default=True,
-                            help=_('display the component or not')),
-        }
-
-    page_size_property = 'navigation.page-size'
-    start_param = '__start'
-    stop_param = '__stop'
-    page_link_templ = u'<span class="slice"><a href="%s" title="%s">%s</a></span>'
-    selected_page_link_templ = u'<span class="selectedSlice"><a href="%s" title="%s">%s</a></span>'
-    previous_page_link_templ = next_page_link_templ = page_link_templ
-
-    def __init__(self, req, rset, **kwargs):
-        super(NavigationComponent, self).__init__(req, rset=rset, **kwargs)
-        self.starting_from = 0
-        self.total = rset.rowcount
-
-    def get_page_size(self):
-        try:
-            return self._page_size
-        except AttributeError:
-            page_size = self.cw_extra_kwargs.get('page_size')
-            if page_size is None:
-                if 'page_size' in self._cw.form:
-                    page_size = int(self._cw.form['page_size'])
-                else:
-                    page_size = self._cw.property_value(self.page_size_property)
-            self._page_size = page_size
-            return page_size
-
-    def set_page_size(self, page_size):
-        self._page_size = page_size
-
-    page_size = property(get_page_size, set_page_size)
-
-    def page_boundaries(self):
-        try:
-            stop = int(self._cw.form[self.stop_param]) + 1
-            start = int(self._cw.form[self.start_param])
-        except KeyError:
-            start, stop = 0, self.page_size
-        if start >= len(self.cw_rset):
-            start, stop = 0, self.page_size
-        self.starting_from = start
-        return start, stop
-
-    def clean_params(self, params):
-        if self.start_param in params:
-            del params[self.start_param]
-        if self.stop_param in params:
-            del params[self.stop_param]
-
-    def page_url(self, path, params, start=None, stop=None):
-        params = dict(params)
-        params['__fromnavigation'] = 1
-        if start is not None:
-            params[self.start_param] = start
-        if stop is not None:
-            params[self.stop_param] = stop
-        view = self.cw_extra_kwargs.get('view')
-        if view is not None and hasattr(view, 'page_navigation_url'):
-            url = view.page_navigation_url(self, path, params)
-        elif path in ('json', 'ajax'):
-            # 'ajax' is the new correct controller, but the old 'json'
-            # controller should still be supported
-            url = self.ajax_page_url(**params)
-        else:
-            url = self._cw.build_url(path, **params)
-        # XXX hack to avoid opening a new page containing the evaluation of the
-        # js expression on ajax call
-        if url.startswith('javascript:'):
-            url += '; $.noop();'
-        return url
-
-    def ajax_page_url(self, **params):
-        divid = params.setdefault('divid', 'pageContent')
-        params['rql'] = self.cw_rset.printable_rql()
-        return js_href("$(%s).loadxhtml(AJAX_PREFIX_URL, %s, 'get', 'swap')" % (
-            json_dumps('#'+divid), js.ajaxFuncArgs('view', params)))
-
-    def page_link(self, path, params, start, stop, content):
-        url = xml_escape(self.page_url(path, params, start, stop))
-        if start == self.starting_from:
-            return self.selected_page_link_templ % (url, content, content)
-        return self.page_link_templ % (url, content, content)
-
-    @property
-    def prev_icon_url(self):
-        return xml_escape(self._cw.data_url('go_prev.png'))
-
-    @property
-    def next_icon_url(self):
-        return xml_escape(self._cw.data_url('go_next.png'))
-
-    @property
-    def no_previous_page_link(self):
-        return (u'<img src="%s" alt="%s" class="prevnext_nogo"/>' %
-                (self.prev_icon_url, self._cw._('there is no previous page')))
-
-    @property
-    def no_next_page_link(self):
-        return (u'<img src="%s" alt="%s" class="prevnext_nogo"/>' %
-                (self.next_icon_url, self._cw._('there is no next page')))
-
-    @property
-    def no_content_prev_link(self):
-        return (u'<img src="%s" alt="%s" class="prevnext"/>' % (
-                (self.prev_icon_url, self._cw._('no content prev link'))))
-
-    @property
-    def no_content_next_link(self):
-        return (u'<img src="%s" alt="%s" class="prevnext"/>' %
-                (self.next_icon_url, self._cw._('no content next link')))
-
-    def previous_link(self, path, params, content=None, title=_('previous_results')):
-        if not content:
-            content = self.no_content_prev_link
-        start = self.starting_from
-        if not start :
-            return self.no_previous_page_link
-        start = max(0, start - self.page_size)
-        stop = start + self.page_size - 1
-        url = xml_escape(self.page_url(path, params, start, stop))
-        return self.previous_page_link_templ % (url, self._cw._(title), content)
-
-    def next_link(self, path, params, content=None, title=_('next_results')):
-        if not content:
-            content = self.no_content_next_link
-        start = self.starting_from + self.page_size
-        if start >= self.total:
-            return self.no_next_page_link
-        stop = start + self.page_size - 1
-        url = xml_escape(self.page_url(path, params, start, stop))
-        return self.next_page_link_templ % (url, self._cw._(title), content)
-
-
-# new contextual components system #############################################
-
-def override_ctx(cls, **kwargs):
-    cwpdefs = cls.cw_property_defs.copy()
-    cwpdefs['context']  = cwpdefs['context'].copy()
-    cwpdefs['context'].update(kwargs)
-    return cwpdefs
-
-
-class EmptyComponent(Exception):
-    """some selectable component has actually no content and should not be
-    rendered
-    """
-
-
-class Link(object):
-    """a link to a view or action in the ui.
-
-    Use this rather than `cw.web.htmlwidgets.BoxLink`.
-
-    Note this class could probably be avoided with a proper DOM on the server
-    side.
-    """
-    newstyle = True
-
-    def __init__(self, href, label, **attrs):
-        self.href = href
-        self.label = label
-        self.attrs = attrs
-
-    def __unicode__(self):
-        return tags.a(self.label, href=self.href, **self.attrs)
-
-    if PY3:
-        __str__ = __unicode__
-
-    def render(self, w):
-        w(tags.a(self.label, href=self.href, **self.attrs))
-
-    def __repr__(self):
-        return '<%s: href=%r label=%r %r>' % (self.__class__.__name__,
-                                              self.href, self.label, self.attrs)
-
-
-class Separator(object):
-    """a menu separator.
-
-    Use this rather than `cw.web.htmlwidgets.BoxSeparator`.
-    """
-    newstyle = True
-
-    def render(self, w):
-        w(u'<hr class="boxSeparator"/>')
-
-
-def _bwcompatible_render_item(w, item):
-    if hasattr(item, 'render'):
-        if getattr(item, 'newstyle', False):
-            if isinstance(item, Separator):
-                w(u'</ul>')
-                item.render(w)
-                w(u'<ul>')
-            else:
-                w(u'<li>')
-                item.render(w)
-                w(u'</li>')
-        else:
-            item.render(w) # XXX displays <li> by itself
-    else:
-        w(u'<li>%s</li>' % item)
-
-
-class Layout(Component):
-    __regid__ = 'component_layout'
-    __abstract__ = True
-
-    def init_rendering(self):
-        """init view for rendering. Return true if we should go on, false
-        if we should stop now.
-        """
-        view = self.cw_extra_kwargs['view']
-        try:
-            view.init_rendering()
-        except Unauthorized as ex:
-            self.warning("can't render %s: %s", view, ex)
-            return False
-        except EmptyComponent:
-            return False
-        return True
-
-
-class LayoutableMixIn(object):
-    layout_id = None # to be defined in concret class
-    layout_args = {}
-
-    def layout_render(self, w, **kwargs):
-        getlayout = self._cw.vreg['components'].select
-        layout = getlayout(self.layout_id, self._cw, **self.layout_select_args())
-        layout.render(w)
-
-    def layout_select_args(self):
-        args  = dict(rset=self.cw_rset, row=self.cw_row, col=self.cw_col,
-                     view=self)
-        args.update(self.layout_args)
-        return args
-
-
-class CtxComponent(LayoutableMixIn, AppObject):
-    """base class for contextual components. The following contexts are
-    predefined:
-
-    * boxes: 'left', 'incontext', 'right'
-    * section: 'navcontenttop', 'navcontentbottom', 'navtop', 'navbottom'
-    * other: 'ctxtoolbar'
-
-    The 'incontext', 'navcontenttop', 'navcontentbottom' and 'ctxtoolbar'
-    contexts are handled by the default primary view, others by the default main
-    template.
-
-    All subclasses may not support all those contexts (for instance if it can't
-    be displayed as box, or as a toolbar icon). You may restrict allowed context
-    as follows:
-
-    .. sourcecode:: python
-
-      class MyComponent(CtxComponent):
-          cw_property_defs = override_ctx(CtxComponent,
-                                          vocabulary=[list of contexts])
-          context = 'my default context'
-
-    You can configure a component's default context by simply giving an
-    appropriate value to the `context` class attribute, as seen above.
-    """
-    __registry__ = 'ctxcomponents'
-    __select__ = ~no_cnx()
-
-    categories_in_order = ()
-    cw_property_defs = {
-        _('visible'): dict(type='Boolean', default=True,
-                           help=_('display the box or not')),
-        _('order'):   dict(type='Int', default=99,
-                           help=_('display order of the box')),
-        _('context'): dict(type='String', default='left',
-                           vocabulary=(_('left'), _('incontext'), _('right'),
-                                       _('navtop'), _('navbottom'),
-                                       _('navcontenttop'), _('navcontentbottom'),
-                                       _('ctxtoolbar')),
-                           help=_('context where this component should be displayed')),
-        }
-    visible = True
-    order = 0
-    context = 'left'
-    contextual = False
-    title = None
-    layout_id = 'component_layout'
-
-    def render(self, w, **kwargs):
-        self.layout_render(w, **kwargs)
-
-    def layout_select_args(self):
-        args = super(CtxComponent, self).layout_select_args()
-        try:
-            # XXX ensure context is given when the component is reloaded through
-            # ajax
-            args['context'] = self.cw_extra_kwargs['context']
-        except KeyError:
-            args['context'] = self.cw_propval('context')
-        return args
-
-    def init_rendering(self):
-        """init rendering callback: that's the good time to check your component
-        has some content to display. If not, you can still raise
-        :exc:`EmptyComponent` to inform it should be skipped.
-
-        Also, :exc:`Unauthorized` will be caught, logged, then the component
-        will be skipped.
-        """
-        self.items = []
-
-    @property
-    def domid(self):
-        """return the HTML DOM identifier for this component"""
-        return domid(self.__regid__)
-
-    @property
-    def cssclass(self):
-        """return the CSS class name for this component"""
-        return domid(self.__regid__)
-
-    def render_title(self, w):
-        """return the title for this component"""
-        if self.title:
-            w(self._cw._(self.title))
-
-    def render_body(self, w):
-        """return the body (content) for this component"""
-        raise NotImplementedError()
-
-    def render_items(self, w, items=None, klass=u'boxListing'):
-        if items is None:
-            items = self.items
-        assert items
-        w(u'<ul class="%s">' % klass)
-        for item in items:
-            _bwcompatible_render_item(w, item)
-        w(u'</ul>')
-
-    def append(self, item):
-        self.items.append(item)
-
-    def action_link(self, action):
-        return self.link(self._cw._(action.title), action.url())
-
-    def link(self, title, url, **kwargs):
-        if self._cw.selected(url):
-            try:
-                kwargs['klass'] += ' selected'
-            except KeyError:
-                kwargs['klass'] = 'selected'
-        return Link(url, title, **kwargs)
-
-    def separator(self):
-        return Separator()
-
-
-class EntityCtxComponent(CtxComponent):
-    """base class for boxes related to a single entity"""
-    __select__ = CtxComponent.__select__ & non_final_entity() & one_line_rset()
-    context = 'incontext'
-    contextual = True
-
-    def __init__(self, *args, **kwargs):
-        super(EntityCtxComponent, self).__init__(*args, **kwargs)
-        try:
-            entity = kwargs['entity']
-        except KeyError:
-            entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)
-        self.entity = entity
-
-    def layout_select_args(self):
-        args = super(EntityCtxComponent, self).layout_select_args()
-        args['entity'] = self.entity
-        return args
-
-    @property
-    def domid(self):
-        return domid(self.__regid__) + text_type(self.entity.eid)
-
-    def lazy_view_holder(self, w, entity, oid, registry='views'):
-        """add a holder and return a URL that may be used to replace this
-        holder by the html generate by the view specified by registry and
-        identifier. Registry defaults to 'views'.
-        """
-        holderid = '%sHolder' % self.domid
-        w(u'<div id="%s"></div>' % holderid)
-        params = self.cw_extra_kwargs.copy()
-        params.pop('view', None)
-        params.pop('entity', None)
-        form = params.pop('formparams', {})
-        if entity.has_eid():
-            eid = entity.eid
-        else:
-            eid = None
-            form['etype'] = entity.cw_etype
-            form['tempEid'] = entity.eid
-        args = [json_dumps(x) for x in (registry, oid, eid, params)]
-        return self._cw.ajax_replace_url(
-            holderid, fname='render', arg=args, **form)
-
-
-# high level abstract classes ##################################################
-
-class RQLCtxComponent(CtxComponent):
-    """abstract box for boxes displaying the content of a rql query not related
-    to the current result set.
-
-    Notice that this class's init_rendering implemention is overwriting context
-    result set (eg `cw_rset`) with the result set returned by execution of
-    `to_display_rql()`.
-    """
-    rql = None
-
-    def to_display_rql(self):
-        """return arguments to give to self._cw.execute, as a tuple, to build
-        the result set to be displayed by this box.
-        """
-        assert self.rql is not None, self.__regid__
-        return (self.rql,)
-
-    def init_rendering(self):
-        super(RQLCtxComponent, self).init_rendering()
-        self.cw_rset = self._cw.execute(*self.to_display_rql())
-        if not self.cw_rset:
-            raise EmptyComponent()
-
-    def render_body(self, w):
-        rset = self.cw_rset
-        if len(rset[0]) == 2:
-            items = []
-            for i, (eid, label) in enumerate(rset):
-                entity = rset.get_entity(i, 0)
-                items.append(self.link(label, entity.absolute_url()))
-        else:
-            items = [self.link(e.dc_title(), e.absolute_url())
-                     for e in rset.entities()]
-        self.render_items(w, items)
-
-
-class EditRelationMixIn(ReloadableMixIn):
-
-    def box_item(self, entity, etarget, fname, label):
-        """builds HTML link to edit relation between `entity` and `etarget`"""
-        args = {role(self) : entity.eid, target(self): etarget.eid}
-        # for each target, provide a link to edit the relation
-        jscall = js.cw.utils.callAjaxFuncThenReload(fname,
-                                                    self.rtype,
-                                                    args['subject'],
-                                                    args['object'])
-        return u'[<a href="javascript: %s" class="action">%s</a>] %s' % (
-            xml_escape(text_type(jscall)), label, etarget.view('incontext'))
-
-    def related_boxitems(self, entity):
-        return [self.box_item(entity, etarget, 'delete_relation', u'-')
-                for etarget in self.related_entities(entity)]
-
-    def related_entities(self, entity):
-        return entity.related(self.rtype, role(self), entities=True)
-
-    def unrelated_boxitems(self, entity):
-        return [self.box_item(entity, etarget, 'add_relation', u'+')
-                for etarget in self.unrelated_entities(entity)]
-
-    def unrelated_entities(self, entity):
-        """returns the list of unrelated entities, using the entity's
-        appropriate vocabulary function
-        """
-        skip = set(text_type(e.eid) for e in entity.related(self.rtype, role(self),
-                                                          entities=True))
-        skip.add(None)
-        skip.add(INTERNAL_FIELD_VALUE)
-        filteretype = getattr(self, 'etype', None)
-        entities = []
-        form = self._cw.vreg['forms'].select('edition', self._cw,
-                                             rset=self.cw_rset,
-                                             row=self.cw_row or 0)
-        field = form.field_by_name(self.rtype, role(self), entity.e_schema)
-        for _, eid in field.vocabulary(form):
-            if eid not in skip:
-                entity = self._cw.entity_from_eid(eid)
-                if filteretype is None or entity.cw_etype == filteretype:
-                    entities.append(entity)
-        return entities
-
-# XXX should be a view usable using uicfg
-class EditRelationCtxComponent(EditRelationMixIn, EntityCtxComponent):
-    """base class for boxes which let add or remove entities linked by a given
-    relation
-
-    subclasses should define at least id, rtype and target class attributes.
-    """
-    # to be defined in concrete classes
-    rtype = None
-
-    def render_title(self, w):
-        w(display_name(self._cw, self.rtype, role(self),
-                       context=self.entity.cw_etype))
-
-    def render_body(self, w):
-        self._cw.add_js('cubicweb.ajax.js')
-        related = self.related_boxitems(self.entity)
-        unrelated = self.unrelated_boxitems(self.entity)
-        self.items.extend(related)
-        if related and unrelated:
-            self.items.append(u'<hr class="boxSeparator"/>')
-        self.items.extend(unrelated)
-        self.render_items(w)
-
-
-class AjaxEditRelationCtxComponent(EntityCtxComponent):
-    __select__ = EntityCtxComponent.__select__ & (
-        partial_relation_possible(action='add') | partial_has_related_entities())
-
-    # view used to display related entties
-    item_vid = 'incontext'
-    # values separator when multiple values are allowed
-    separator = ','
-    # msgid of the message to display when some new relation has been added/removed
-    added_msg = None
-    removed_msg = None
-
-    # to be defined in concrete classes
-    rtype = role = target_etype = None
-    # class attributes below *must* be set in concrete classes (additionally to
-    # rtype / role [/ target_etype]. They should correspond to js_* methods on
-    # the json controller
-
-    # function(eid)
-    # -> expected to return a list of values to display as input selector
-    #    vocabulary
-    fname_vocabulary = None
-
-    # function(eid, value)
-    # -> handle the selector's input (eg create necessary entities and/or
-    # relations). If the relation is multiple, you'll get a list of value, else
-    # a single string value.
-    fname_validate = None
-
-    # function(eid, linked entity eid)
-    # -> remove the relation
-    fname_remove = None
-
-    def __init__(self, *args, **kwargs):
-        super(AjaxEditRelationCtxComponent, self).__init__(*args, **kwargs)
-        self.rdef = self.entity.e_schema.rdef(self.rtype, self.role, self.target_etype)
-
-    def render_title(self, w):
-        w(self.rdef.rtype.display_name(self._cw, self.role,
-                                       context=self.entity.cw_etype))
-
-    def add_js_css(self):
-        self._cw.add_js(('jquery.ui.js', 'cubicweb.widgets.js'))
-        self._cw.add_js(('cubicweb.ajax.js', 'cubicweb.ajax.box.js'))
-        self._cw.add_css('jquery.ui.css')
-        return True
-
-    def render_body(self, w):
-        req = self._cw
-        entity = self.entity
-        related = entity.related(self.rtype, self.role)
-        if self.role == 'subject':
-            mayadd = self.rdef.has_perm(req, 'add', fromeid=entity.eid)
-        else:
-            mayadd = self.rdef.has_perm(req, 'add', toeid=entity.eid)
-        js_css_added = False
-        if mayadd:
-            js_css_added = self.add_js_css()
-        _ = req._
-        if related:
-            maydel = None
-            w(u'<table class="ajaxEditRelationTable">')
-            for rentity in related.entities():
-                if maydel is None:
-                    # Only check permission for the first related.
-                    if self.role == 'subject':
-                        fromeid, toeid = entity.eid, rentity.eid
-                    else:
-                        fromeid, toeid = rentity.eid, entity.eid
-                    maydel = self.rdef.has_perm(
-                            req, 'delete', fromeid=fromeid, toeid=toeid)
-                # for each related entity, provide a link to remove the relation
-                subview = rentity.view(self.item_vid)
-                if maydel:
-                    if not js_css_added:
-                        js_css_added = self.add_js_css()
-                    jscall = text_type(js.ajaxBoxRemoveLinkedEntity(
-                        self.__regid__, entity.eid, rentity.eid,
-                        self.fname_remove,
-                        self.removed_msg and _(self.removed_msg)))
-                    w(u'<tr><td class="dellink">[<a href="javascript: %s">-</a>]</td>'
-                      '<td class="entity"> %s</td></tr>' % (xml_escape(jscall),
-                                                            subview))
-                else:
-                    w(u'<tr><td class="entity">%s</td></tr>' % (subview))
-            w(u'</table>')
-        else:
-            w(_('no related entity'))
-        if mayadd:
-            multiple = self.rdef.role_cardinality(self.role) in '*+'
-            w(u'<table><tr><td>')
-            jscall = text_type(js.ajaxBoxShowSelector(
-                self.__regid__, entity.eid, self.fname_vocabulary,
-                self.fname_validate, self.added_msg and _(self.added_msg),
-                _(stdmsgs.BUTTON_OK[0]), _(stdmsgs.BUTTON_CANCEL[0]),
-                multiple and self.separator))
-            w('<a class="button sglink" href="javascript: %s">%s</a>' % (
-                xml_escape(jscall),
-                multiple and _('add_relation') or _('update_relation')))
-            w(u'</td><td>')
-            w(u'<div id="%sHolder"></div>' % self.domid)
-            w(u'</td></tr></table>')
-
-
-class RelatedObjectsCtxComponent(EntityCtxComponent):
-    """a contextual component to display entities related to another"""
-    __select__ = EntityCtxComponent.__select__ & partial_has_related_entities()
-    context = 'navcontentbottom'
-    rtype = None
-    role = 'subject'
-
-    vid = 'list'
-
-    def render_body(self, w):
-        rset = self.entity.related(self.rtype, role(self))
-        self._cw.view(self.vid, rset, w=w)
-
-
-# old contextual components, deprecated ########################################
-
-@add_metaclass(class_deprecated)
-class EntityVComponent(Component):
-    """abstract base class for additinal components displayed in content
-    headers and footer according to:
-
-    * the displayed entity's type
-    * a context (currently 'header' or 'footer')
-
-    it should be configured using .accepts, .etype, .rtype, .target and
-    .context class attributes
-    """
-    __deprecation_warning__ = '[3.10] *VComponent classes are deprecated, use *CtxComponent instead (%(cls)s)'
-
-    __registry__ = 'ctxcomponents'
-    __select__ = one_line_rset()
-
-    cw_property_defs = {
-        _('visible'):  dict(type='Boolean', default=True,
-                            help=_('display the component or not')),
-        _('order'):    dict(type='Int', default=99,
-                            help=_('display order of the component')),
-        _('context'):  dict(type='String', default='navtop',
-                            vocabulary=(_('navtop'), _('navbottom'),
-                                        _('navcontenttop'), _('navcontentbottom'),
-                                        _('ctxtoolbar')),
-                            help=_('context where this component should be displayed')),
-    }
-
-    context = 'navcontentbottom'
-
-    def call(self, view=None):
-        if self.cw_rset is None:
-            self.entity_call(self.cw_extra_kwargs.pop('entity'))
-        else:
-            self.cell_call(0, 0, view=view)
-
-    def cell_call(self, row, col, view=None):
-        self.entity_call(self.cw_rset.get_entity(row, col), view=view)
-
-    def entity_call(self, entity, view=None):
-        raise NotImplementedError()
-
-class RelatedObjectsVComponent(EntityVComponent):
-    """a section to display some related entities"""
-    __select__ = EntityVComponent.__select__ & partial_has_related_entities()
-
-    vid = 'list'
-    # to be defined in concrete classes
-    rtype = title = None
-
-    def rql(self):
-        """override this method if you want to use a custom rql query"""
-        return None
-
-    def cell_call(self, row, col, view=None):
-        rql = self.rql()
-        if rql is None:
-            entity = self.cw_rset.get_entity(row, col)
-            rset = entity.related(self.rtype, role(self))
-        else:
-            eid = self.cw_rset[row][col]
-            rset = self._cw.execute(self.rql(), {'x': eid})
-        if not rset.rowcount:
-            return
-        self.w(u'<div class="%s">' % self.cssclass)
-        self.w(u'<h4>%s</h4>\n' % self._cw._(self.title).capitalize())
-        self.wview(self.vid, rset)
-        self.w(u'</div>')