web/component.py
author Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
Thu, 28 May 2009 09:20:07 +0200
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"""abstract component class and base components definition 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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from logilab.common.deprecation import class_renamed
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from logilab.mtconverter import html_escape
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from cubicweb import role
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from cubicweb.utils import merge_dicts
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from cubicweb.view import View, Component
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from cubicweb.selectors import (
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    paginated_rset, one_line_rset, primary_view, match_context_prop,
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    partial_has_related_entities, condition_compat, accepts_compat,
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    has_relation_compat)
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_ = unicode
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class EntityVComponent(Component):
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    """abstract base class for additinal components displayed in content
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    headers and footer according to:
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    * the displayed entity's type
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    * a context (currently 'header' or 'footer')
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    it should be configured using .accepts, .etype, .rtype, .target and
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    .context class attributes
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    """
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    __registry__ = 'contentnavigation'
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    __select__ = one_line_rset() & primary_view() & match_context_prop()
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    registered = accepts_compat(has_relation_compat(condition_compat(View.registered)))
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    property_defs = {
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        _('visible'):  dict(type='Boolean', default=True,
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                            help=_('display the box or not')),
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        _('order'):    dict(type='Int', default=99,
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                            help=_('display order of the component')),
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        _('context'):  dict(type='String', default='header',
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                            vocabulary=(_('navtop'), _('navbottom'),
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                                        _('navcontenttop'), _('navcontentbottom')),
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                            #vocabulary=(_('header'), _('incontext'), _('footer')),
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                            help=_('context where this component should be displayed')),
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        _('htmlclass'):dict(type='String', default='mainRelated',
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                            help=_('html class of the component')),
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    }
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    context = 'navcontentbottom' # 'footer' | 'header' | 'incontext'
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    def call(self, view=None):
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        return self.cell_call(0, 0, view=view)
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    def cell_call(self, row, col, view=None):
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        raise NotImplementedError()
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class NavigationComponent(Component):
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    """abstract base class for navigation components"""
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    id = 'navigation'
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    __select__ = paginated_rset()
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    property_defs = {
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        _('visible'):  dict(type='Boolean', default=True,
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                            help=_('display the component or not')),
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        }
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    page_size_property = 'navigation.page-size'
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    start_param = '__start'
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    stop_param = '__stop'
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    page_link_templ = u'<span class="slice"><a href="%s" title="%s">%s</a></span>'
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    selected_page_link_templ = u'<span class="selectedSlice"><a href="%s" title="%s">%s</a></span>'
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    previous_page_link_templ = next_page_link_templ = page_link_templ
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    no_previous_page_link = no_next_page_link = u''
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    def __init__(self, req, rset, **kwargs):
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        super(NavigationComponent, self).__init__(req, rset, **kwargs)
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        self.starting_from = 0
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        self.total = rset.rowcount
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    def get_page_size(self):
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        try:
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            return self._page_size
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        except AttributeError:
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            page_size = self.extra_kwargs.get('page_size')
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            if page_size is None:
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                if 'page_size' in self.req.form:
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                    page_size = int(self.req.form['page_size'])
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                else:
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                    page_size = self.req.property_value(self.page_size_property)
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            self._page_size = page_size
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            return page_size
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    def set_page_size(self, page_size):
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        self._page_size = page_size
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    page_size = property(get_page_size, set_page_size)
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    def page_boundaries(self):
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        try:
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            stop = int(self.req.form[self.stop_param]) + 1
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            start = int(self.req.form[self.start_param])
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        except KeyError:
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            start, stop = 0, self.page_size
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        self.starting_from = start
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        return start, stop
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    def clean_params(self, params):
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        if self.start_param in params:
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            del params[self.start_param]
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        if self.stop_param in params:
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            del params[self.stop_param]
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    def page_link(self, path, params, start, stop, content):
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        url = self.build_url(path, **merge_dicts(params, {self.start_param : start,
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                                                          self.stop_param : stop,}))
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        url = html_escape(url)
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        if start == self.starting_from:
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            return self.selected_page_link_templ % (url, content, content)
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        return self.page_link_templ % (url, content, content)
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    def previous_link(self, params, content='&lt;&lt;', title=_('previous_results')):
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        start = self.starting_from
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        if not start :
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            return self.no_previous_page_link
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        start = max(0, start - self.page_size)
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        stop = start + self.page_size - 1
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        url = self.build_url(**merge_dicts(params, {self.start_param : start,
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                                                    self.stop_param : stop,}))
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        url = html_escape(url)
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        return self.previous_page_link_templ % (url, title, content)
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    def next_link(self, params, content='&gt;&gt;', title=_('next_results')):
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        start = self.starting_from + self.page_size
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        if start >= self.total:
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            return self.no_next_page_link
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        stop = start + self.page_size - 1
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        url = self.build_url(**merge_dicts(params, {self.start_param : start,
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                                                    self.stop_param : stop,}))
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        url = html_escape(url)
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        return self.next_page_link_templ % (url, title, content)
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class RelatedObjectsVComponent(EntityVComponent):
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    """a section to display some related entities"""
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    __select__ = EntityVComponent.__select__ & partial_has_related_entities()
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0
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    vid = 'list'
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0
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    def rql(self):
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        """override this method if you want to use a custom rql query"""
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        return None
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    def cell_call(self, row, col, view=None):
0
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        rql = self.rql()
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        if rql is None:
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            entity = self.rset.get_entity(row, col)
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            rset = entity.related(self.rtype, role(self))
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        else:
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            eid = self.rset[row][col]
0
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            rset = self.req.execute(self.rql(), {'x': eid}, 'x')
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        if not rset.rowcount:
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            return
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        self.w(u'<div class="%s">' % self.div_class())
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        self.wview(self.vid, rset, title=self.req._(self.title).capitalize())
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        self.w(u'</div>')
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VComponent = class_renamed('VComponent', Component,
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                           'VComponent is deprecated, use Component')
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SingletonVComponent = class_renamed('SingletonVComponent', Component,
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                                    'SingletonVComponent is deprecated, use '
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                                    'Component and explicit registration control')