web/views/ibreadcrumbs.py
author Christophe de Vienne <christophe@unlish.com>
Thu, 08 Jan 2015 23:06:12 +0100
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permissions -rw-r--r--
[doc] Insert the dev docs in the toc Related to #4832808
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# copyright 2003-2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""breadcrumbs components definition for CubicWeb web client"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from warnings import warn
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from logilab.mtconverter import xml_escape
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from cubicweb import tags, uilib
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from cubicweb.entity import Entity
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from cubicweb.predicates import (is_instance, one_line_rset, adaptable,
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                                one_etype_rset, multi_lines_rset, any_rset,
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                                match_form_params)
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from cubicweb.view import EntityView, EntityAdapter
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from cubicweb.web.views import basecomponents
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# don't use AnyEntity since this may cause bug with isinstance() due to reloading
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class IBreadCrumbsAdapter(EntityAdapter):
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    """adapters for entities which can be"located" on some path to display in
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    the web ui
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    """
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    __regid__ = 'IBreadCrumbs'
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    __select__ = is_instance('Any', accept_none=False)
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    def parent_entity(self):
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        itree = self.entity.cw_adapt_to('ITree')
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        if itree is not None:
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            return itree.parent()
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        return None
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    def breadcrumbs(self, view=None, recurs=None):
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        """return a list containing some:
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        * tuple (url, label)
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        * entity
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        * simple label string
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        defining path from a root to the current view
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        the main view is given as argument so breadcrumbs may vary according to
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        displayed view (may be None). When recursing on a parent entity, the
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        `recurs` argument should be a set of already traversed nodes (infinite
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        loop safety belt).
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        """
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        parent = self.parent_entity()
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        if parent is not None:
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            if recurs:
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                _recurs = recurs
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            else:
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                _recurs = set()
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            if _recurs and parent.eid in _recurs:
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                self.error('cycle in breadcrumbs for entity %s' % self.entity)
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                return []
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            _recurs.add(parent.eid)
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            adapter = parent.cw_adapt_to('IBreadCrumbs')
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            path = adapter.breadcrumbs(view, _recurs) + [self.entity]
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        else:
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            path = [self.entity]
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        if not recurs:
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            if view is None:
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                if 'vtitle' in self._cw.form:
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                    # embeding for instance
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                    path.append( self._cw.form['vtitle'] )
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            elif view.__regid__ != 'primary' and hasattr(view, 'title'):
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                path.append( self._cw._(view.title) )
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        return path
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class BreadCrumbEntityVComponent(basecomponents.HeaderComponent):
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    __regid__ = 'breadcrumbs'
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    __select__ = (basecomponents.HeaderComponent.__select__
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                  & one_line_rset() & adaptable('IBreadCrumbs'))
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    order = basecomponents.ApplicationName.order + 1
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    context = basecomponents.ApplicationName.context
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    separator = u'&#160;&gt;&#160;'
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    link_template = u'<a href="%s">%s</a>'
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    first_separator = True
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    # XXX support kwargs for compat with other components which gets the view as
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    # argument
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    def render(self, w, **kwargs):
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        try:
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            entity = self.cw_extra_kwargs['entity']
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        except KeyError:
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            entity = self.cw_rset.get_entity(0, 0)
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        adapter = entity.cw_adapt_to('IBreadCrumbs')
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        view = self.cw_extra_kwargs.get('view')
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        path = adapter.breadcrumbs(view)
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        if path:
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            self.open_breadcrumbs(w)
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            self.render_breadcrumbs(w, entity, path)
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            self.close_breadcrumbs(w)
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    def open_breadcrumbs(self, w):
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        w(u'<span id="breadcrumbs" class="pathbar">')
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        if self.first_separator:
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            w(self.separator)
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    def close_breadcrumbs(self, w):
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        w(u'</span>')
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    def render_breadcrumbs(self, w, contextentity, path):
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        root = path.pop(0)
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        if isinstance(root, Entity):
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            w(self.link_template % (self._cw.build_url(root.__regid__),
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                                         root.dc_type('plural')))
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            w(self.separator)
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        self.wpath_part(w, root, contextentity, not path)
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        for i, parent in enumerate(path):
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            w(self.separator)
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            w(u"\n")
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            self.wpath_part(w, parent, contextentity, i == len(path) - 1)
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    def wpath_part(self, w, part, contextentity, last=False): # XXX deprecates last argument?
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        if isinstance(part, Entity):
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            w(part.view('breadcrumbs'))
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        elif isinstance(part, tuple):
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            url, title = part
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            textsize = self._cw.property_value('navigation.short-line-size')
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            w(self.link_template % (
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                xml_escape(url), xml_escape(uilib.cut(title, textsize))))
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        else:
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            textsize = self._cw.property_value('navigation.short-line-size')
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            w(xml_escape(uilib.cut(unicode(part), textsize)))
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class BreadCrumbETypeVComponent(BreadCrumbEntityVComponent):
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    __select__ = (basecomponents.HeaderComponent.__select__
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                  & multi_lines_rset() & one_etype_rset()
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                  & adaptable('IBreadCrumbs'))
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    def render_breadcrumbs(self, w, contextentity, path):
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        # XXX hack: only display etype name or first non entity path part
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        root = path.pop(0)
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        if isinstance(root, Entity):
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            w(u'<a href="%s">%s</a>' % (self._cw.build_url(root.__regid__),
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                                        root.dc_type('plural')))
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        else:
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            self.wpath_part(w, root, contextentity, not path)
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class BreadCrumbAnyRSetVComponent(BreadCrumbEntityVComponent):
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    __select__ = basecomponents.HeaderComponent.__select__ & any_rset()
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    # XXX support kwargs for compat with other components which gets the view as
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   166
    # argument
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    def render(self, w, **kwargs):
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        self.open_breadcrumbs(w)
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        w(self._cw._('search'))
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        self.close_breadcrumbs(w)
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class BreadCrumbLinkToVComponent(BreadCrumbEntityVComponent):
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    __select__ = basecomponents.HeaderComponent.__select__ & match_form_params('__linkto')
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    def render(self, w, **kwargs):
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   177
        eid = self._cw.list_form_param('__linkto')[0].split(':')[1]
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        entity = self._cw.entity_from_eid(eid)
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        ecmp = self._cw.vreg[self.__registry__].select(
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            self.__regid__, self._cw, entity=entity, **kwargs)
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        ecmp.render(w, **kwargs)
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class BreadCrumbView(EntityView):
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    __regid__ = 'breadcrumbs'
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    def cell_call(self, row, col, **kwargs):
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        entity = self.cw_rset.get_entity(row, col)
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        desc = uilib.cut(entity.dc_description(), 50)
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        # NOTE remember camember: tags.a autoescapes
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        self.w(tags.a(entity.view('breadcrumbtext'),
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                      href=entity.absolute_url(), title=desc))
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class BreadCrumbTextView(EntityView):
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    __regid__ = 'breadcrumbtext'
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    def cell_call(self, row, col, **kwargs):
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        entity = self.cw_rset.get_entity(row, col)
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        textsize = self._cw.property_value('navigation.short-line-size')
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        self.w(uilib.cut(entity.dc_title(), textsize))