web/views/treeview.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Fri, 29 Jan 2010 16:53:52 +0100
branchstable
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[treeview] ensure items are ordered according to their dc_title, we can't rely on an ordered rset * is_last has to be computed on the caller now, not possible in the callee * rely on b3f61c38526b to use entity.view() with vid in *view*'s arguments
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"""Set of tree-building widgets, based on jQuery treeview plugin
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:organization: Logilab
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:copyright: 2001-2010 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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import simplejson as json
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from logilab.common.decorators import monkeypatch
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from logilab.mtconverter import xml_escape
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from cubicweb.utils import make_uid
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from cubicweb.interfaces import ITree
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from cubicweb.selectors import implements
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from cubicweb.view import EntityView
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def treecookiename(treeid):
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    return str('%s-treestate' % treeid)
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class TreeView(EntityView):
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    id = 'treeview'
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    itemvid = 'treeitemview'
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    subvid = 'oneline'
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    css_classes = 'treeview widget'
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    title = _('tree view')
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    def _init_params(self, subvid, treeid, initial_load, initial_thru_ajax, morekwargs):
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        form = self.req.form
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        if subvid is None:
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            subvid = form.pop('treesubvid', self.subvid) # consume it
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        if treeid is None:
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            treeid = form.pop('treeid', None)
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            if treeid is None:
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                treeid = 'throw_away' + make_uid('uid')
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        if 'morekwargs' in self.req.form:
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            ajaxargs = json.loads(form.pop('morekwargs'))
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            # got unicode & python keywords must be strings
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            morekwargs.update(dict((str(k), v)
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                                   for k, v in ajaxargs.iteritems()))
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        toplevel_thru_ajax = form.pop('treeview_top', False) or initial_thru_ajax
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        toplevel = toplevel_thru_ajax or (initial_load and not form.get('fname'))
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        return subvid, treeid, toplevel_thru_ajax, toplevel
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    def _init_headers(self, treeid, toplevel_thru_ajax):
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        self.req.add_css('jquery.treeview.css')
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        self.req.add_js(('cubicweb.ajax.js', 'cubicweb.widgets.js', 'jquery.treeview.js'))
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        self.req.html_headers.add_onload(u"""
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jQuery("#tree-%s").treeview({toggle: toggleTree, prerendered: true});""" % treeid,
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                                         jsoncall=toplevel_thru_ajax)
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    def call(self, subvid=None, treeid=None,
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             initial_load=True, initial_thru_ajax=False, **morekwargs):
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        subvid, treeid, toplevel_thru_ajax, toplevel = self._init_params(
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            subvid, treeid, initial_load, initial_thru_ajax, morekwargs)
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        ulid = ' '
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        if toplevel:
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            self._init_headers(treeid, toplevel_thru_ajax)
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            ulid = ' id="tree-%s"' % treeid
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        self.w(u'<ul%s class="%s">' % (ulid, self.css_classes))
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        for i, entity in enumerate(sorted(self.rset.entities(), key=lambda x: x.dc_title())):
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            if i+1 < len(self.rset):
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                morekwargs['is_last'] = False
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            else:
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                morekwargs['is_last'] = True
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            entity.view(self.itemvid, vid=subvid, parentvid=self.id,
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                        treeid=treeid, w=self.w, **morekwargs)
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        self.w(u'</ul>')
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    def cell_call(self, *args, **allargs):
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        """ does not makes much sense until you have to invoke
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        somentity.view('treeview') """
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        allargs.pop('row')
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        allargs.pop('col')
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        self.call(*args, **allargs)
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class FileTreeView(TreeView):
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    """specific version of the treeview to display file trees
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    """
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    id = 'filetree'
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    css_classes = 'treeview widget filetree'
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    title = _('file tree view')
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    def call(self, subvid=None, treeid=None, initial_load=True, **kwargs):
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        super(FileTreeView, self).call(treeid=treeid, subvid='filetree-oneline',
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                                       initial_load=initial_load, **kwargs)
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class FileItemInnerView(EntityView):
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    """inner view used by the TreeItemView instead of oneline view
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    This view adds an enclosing <span> with some specific CSS classes
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    around the oneline view. This is needed by the jquery treeview plugin.
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    """
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    id = 'filetree-oneline'
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    def cell_call(self, row, col):
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        entity = self.entity(row, col)
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        if ITree.is_implemented_by(entity.__class__) and not entity.is_leaf():
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            self.w(u'<div class="folder">%s</div>\n' % entity.view('oneline'))
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        else:
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            # XXX define specific CSS classes according to mime types
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            self.w(u'<div class="file">%s</div>\n' % entity.view('oneline'))
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class DefaultTreeViewItemView(EntityView):
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    """default treeitem view for entities which don't implement ITree"""
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    id = 'treeitemview'
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    def cell_call(self, row, col, vid='oneline', parentvid='treeview', treeid=None):
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        assert treeid is not None
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        entity = self.entity(row, col)
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        itemview = self.view(vid, self.rset, row=row, col=col)
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        if row == len(self.rset) - 1:
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            self.w(u'<li class="last">%s</li>' % itemview)
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        else:
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            self.w(u'<li>%s</li>' % itemview)
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class TreeViewItemView(EntityView):
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    """specific treeitem view for entities which implement ITree
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    (each item should be expandable if it's not a tree leaf)
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    """
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    id = 'treeitemview'
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    default_branch_state_is_open = False
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    __select__ = implements(ITree)
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    def open_state(self, eeid, treeid):
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        cookies = self.req.get_cookie()
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        treestate = cookies.get(treecookiename(treeid))
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        if treestate:
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            return str(eeid) in treestate.value.split(';')
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        return self.default_branch_state_is_open
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    def cell_call(self, row, col, treeid, vid='oneline', parentvid='treeview',
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                  is_last=False, **morekwargs):
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        w = self.w
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        entity = self.entity(row, col)
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        liclasses = []
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        is_open = self.open_state(entity.eid, treeid)
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        is_leaf = not hasattr(entity, 'is_leaf') or entity.is_leaf()
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        if is_leaf:
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            if is_last:
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                liclasses.append('last')
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            w(u'<li class="%s">' % u' '.join(liclasses))
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        else:
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            rql = entity.children_rql() % {'x': entity.eid}
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            url = xml_escape(self.build_url('json', rql=rql, vid=parentvid,
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                                            pageid=self.req.pageid,
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                                            treeid=treeid,
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                                            fname='view',
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                                            treesubvid=vid,
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                                            morekwargs=json.dumps(morekwargs)))
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            divclasses = ['hitarea']
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            if is_open:
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                liclasses.append('collapsable')
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                divclasses.append('collapsable-hitarea')
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            else:
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                liclasses.append('expandable')
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                divclasses.append('expandable-hitarea')
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            if is_last:
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                if is_open:
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                    liclasses.append('lastCollapsable')
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                    divclasses.append('lastCollapsable-hitarea')
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                else:
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                    liclasses.append('lastExpandable')
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                    divclasses.append('lastExpandable-hitarea')
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            if is_open:
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                w(u'<li class="%s">' % u' '.join(liclasses))
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            else:
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                w(u'<li cubicweb:loadurl="%s" class="%s">' % (url, u' '.join(liclasses)))
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            if treeid.startswith('throw_away'):
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                divtail = ''
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            else:
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                divtail = """ onclick="asyncRemoteExec('node_clicked', '%s', '%s')" """ %\
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                    (treeid, entity.eid)
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            w(u'<div class="%s"%s></div>' % (u' '.join(divclasses), divtail))
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            # add empty <ul> because jquery's treeview plugin checks for
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            # sublists presence
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            if not is_open:
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                w(u'<ul class="placeholder"><li>place holder</li></ul>')
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        # the local node info
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        self.wview(vid, self.rset, row=row, col=col, **morekwargs)
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        if is_open and not is_leaf: #  => rql is defined
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            self.wview(parentvid, entity.children(entities=False), subvid=vid,
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                       treeid=treeid, initial_load=False, **morekwargs)
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        w(u'</li>')
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