web/views/tabs.py
author Aurelien Campeas <aurelien.campeas@logilab.fr>
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"""base classes to handle tabbed views
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:organization: Logilab
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:copyright: 2008 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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__docformat__ = "restructuredtext en"
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from logilab.common.decorators import monkeypatch
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from logilab.mtconverter import html_escape
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from cubicweb import NoSelectableObject, role
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from cubicweb.common.view import EntityView
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from cubicweb.common.selectors import has_related_entities
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from cubicweb.common.utils import HTMLHead
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from cubicweb.common.uilib import rql_for_eid
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from cubicweb.web.views.basecontrollers import JSonController
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class LazyViewMixin(object):
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    """provides two convenience methods for the tab machinery
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    can also be used to lazy-load arbitrary views
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    caveat : lazyview is not recursive, i.e : you can't (successfully)
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    lazyload a view that in turns does the same
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    """
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    def _prepare_bindings(self, vid, reloadable):
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        self.req.html_headers.add_onload(u"""
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  jQuery('#lazy-%(vid)s').bind('%(event)s', function(event) {
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     load_now('#lazy-%(vid)s', '#%(vid)s-hole', %(reloadable)s);
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  });""" % {'event': 'load_%s' % vid, 'vid': vid,
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            'reloadable' : str(reloadable).lower()})
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    def lazyview(self, vid, eid=None, reloadable=False, show_spinbox=True, w=None):
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        """a lazy version of wview
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        first version only support lazy viewing for an entity at a time
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        """
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        w = w or self.w
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        self.req.add_js('cubicweb.lazy.js')
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        urlparams = {'vid' : vid, 'mode' : 'html'}
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        if eid:
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            urlparams['rql'] = rql_for_eid(eid)
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        w(u'<div id="lazy-%s" cubicweb:loadurl="%s">' % (
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            vid, html_escape(self.build_url('json', **urlparams))))
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        if show_spinbox:
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            w(u'<img src="data/loading.gif" id="%s-hole" alt="%s"/>'
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              % (vid, self.req._('loading')))
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        w(u'</div>')
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        self._prepare_bindings(vid, reloadable)
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    def forceview(self, vid):
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        """trigger an event that will force immediate loading of the view
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        on dom readyness
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        """
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        self.req.add_js('cubicweb.lazy.js')
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        self.req.html_headers.add_onload("trigger_load('%s');" % vid)
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class TabsMixin(LazyViewMixin):
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    @property
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    def cookie_name(self):
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        return str('%s_active_tab' % self.config.appid)
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    def active_tab(self, tabs, default):
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        cookie = self.req.get_cookie()
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        cookiename = self.cookie_name
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        activetab = cookie.get(cookiename)
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        if activetab is None:
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            cookie[cookiename] = default
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            self.req.set_cookie(cookie, cookiename)
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            tab = default
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        else:
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            tab = activetab.value
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        return tab in tabs and tab or default
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    def prune_tabs(self, tabs):
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        selected_tabs = []
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        for tab in tabs:
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            try:
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                self.vreg.select_view(tab, self.req, self.rset)
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                selected_tabs.append(tab)
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            except NoSelectableObject:
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                continue
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        return selected_tabs
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    def render_tabs(self, tabs, default, entity):
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        self.req.add_css('ui.tabs.css')
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        self.req.add_js(('ui.core.js', 'ui.tabs.js',
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                         'cubicweb.ajax.js', 'cubicweb.tabs.js', 'cubicweb.lazy.js'))
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        # prune tabs : not all are to be shown
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        tabs = self.prune_tabs(tabs)
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        # select a tab
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        active_tab = self.active_tab(tabs, default)
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        # build the html structure
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        w = self.w
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        w(u'<div id="entity-tabs">')
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        w(u'<ul>')
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        for tab in tabs:
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            w(u'<li>')
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            w(u'<a href="#as-%s">' % tab)
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            w(u'<span onclick="set_tab(\'%s\', \'%s\')">' % (tab, self.cookie_name))
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            w(self.req._(tab))
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            w(u'</span>')
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            w(u'</a>')
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            w(u'</li>')
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        w(u'</ul>')
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        w(u'</div>')
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        for tab in tabs:
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            w(u'<div id="as-%s">' % tab)
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            self.lazyview(tab, entity.eid)
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            w(u'</div>')
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        # call the set_tab() JS function *after* each tab is generated
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        # because the callback binding needs to be done before
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        self.req.html_headers.add_onload(u"""
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   jQuery('#entity-tabs > ul').tabs( { selected: %(tabindex)s });
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   set_tab('%(vid)s', '%(cookiename)s');
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 """ % {'tabindex'   : tabs.index(active_tab),
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        'vid'        : active_tab,
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        'cookiename' : self.cookie_name})
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class EntityRelatedTab(EntityView):
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    """A view you should inherit from leftmost,
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    to wrap another actual view displaying entity related stuff.
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    Such a view _must_ provide the rtype, target and vid attributes :
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    Example :
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    class ProjectScreenshotsView(EntityRelationView):
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        '''display project's screenshots'''
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        id = title = _('projectscreenshots')
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        accepts = ('Project',)
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        rtype = 'screenshot'
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        target = 'object'
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        vid = 'gallery'
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        __selectors__ = EntityRelationView.__selectors__ + (one_line_rset,)
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    This is the view we want to have in a tab, only if there is something to show.
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    Then, just define as below, and declare this being the tab content :
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    class ProjectScreenshotTab(DataDependantTab, ProjectScreenshotsView):
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        id = 'screenshots_tab'
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    """
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    __selectors__ = EntityView.__selectors__ + (has_related_entities,)
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    vid = 'list'
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    def cell_call(self, row, col):
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        rset = self.entity(row, col).related(self.rtype, role(self))
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        self.w(u'<div class="mainInfo">')
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        self.wview(self.vid, rset, 'noresult')
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        self.w(u'</div>')