web/views/workflow.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
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"""workflow views:
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* IWorkflowable views and forms
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* workflow entities views (State, Transition, TrInfo)
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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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_ = unicode
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from logilab.mtconverter import xml_escape
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from logilab.common.graph import escape, GraphGenerator, DotBackend
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from cubicweb import Unauthorized, view
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from cubicweb.selectors import (implements, has_related_entities, one_line_rset,
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                                relation_possible, match_form_params)
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from cubicweb.interfaces import IWorkflowable
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from cubicweb.view import EntityView
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from cubicweb.schema import display_name
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from cubicweb.web import uicfg, stdmsgs, action, component, form, action
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from cubicweb.web import formfields as ff, formwidgets as fwdgs
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from cubicweb.web.views import TmpFileViewMixin, forms, primary
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_pvs = uicfg.primaryview_section
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_pvs.tag_subject_of(('Workflow', 'initial_state', '*'), 'hidden')
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_pvs.tag_object_of(('*', 'state_of', 'Workflow'), 'hidden')
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_pvs.tag_object_of(('*', 'transition_of', 'Workflow'), 'hidden')
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_abaa = uicfg.actionbox_appearsin_addmenu
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_abaa.tag_subject_of(('BaseTransition', 'condition', 'RQLExpression'), False)
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_abaa.tag_subject_of(('State', 'allowed_transition', 'BaseTransition'), False)
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_abaa.tag_object_of(('SubWorkflowExitPoint', 'destination_state', 'State'),
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                    False)
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_abaa.tag_object_of(('State', 'state_of', 'Workflow'), True)
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_abaa.tag_object_of(('Transition', 'transition_of', 'Workflow'), True)
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_abaa.tag_object_of(('WorkflowTransition', 'transition_of', 'Workflow'), True)
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_afs = uicfg.autoform_section
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_afs.tag_subject_of(('TrInfo', 'to_state', '*'), 'generated')
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_afs.tag_subject_of(('TrInfo', 'from_state', '*'), 'generated')
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_afs.tag_object_of(('State', 'allowed_transition', '*'), 'primary')
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# IWorkflowable views #########################################################
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class ChangeStateForm(forms.CompositeEntityForm):
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    __regid__ = 'changestate'
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    form_renderer_id = 'base' # don't want EntityFormRenderer
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    form_buttons = [fwdgs.SubmitButton(stdmsgs.YES),
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                    fwdgs.Button(stdmsgs.NO, cwaction='cancel')]
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class ChangeStateFormView(form.FormViewMixIn, view.EntityView):
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    __regid__ = 'statuschange'
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    title = _('status change')
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    __select__ = (one_line_rset() & implements(IWorkflowable)
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                  & match_form_params('treid'))
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    def cell_call(self, row, col):
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        entity = self.cw_rset.get_entity(row, col)
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        transition = self._cw.entity_from_eid(self._cw.form['treid'])
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        dest = transition.destination()
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        _ = self._cw._
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        # specify both rset/row/col and entity in case implements selector (and
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        # not entity_implements) is used on custom form
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        form = self._cw.vreg['forms'].select(
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            'changestate', self._cw, rset=self.cw_rset, row=row, col=col,
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            entity=entity, transition=transition,
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            redirect_path=self.redirectpath(entity))
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        self.w(form.error_message())
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        self.w(u'<h4>%s %s</h4>\n' % (_(transition.name),
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                                      entity.view('oneline')))
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        msg = _('status will change from %(st1)s to %(st2)s') % {
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            'st1': _(entity.current_state.name),
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            'st2': _(dest.name)}
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        self.w(u'<p>%s</p>\n' % msg)
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        trinfo = self._cw.vreg['etypes'].etype_class('TrInfo')(self._cw)
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        trinfo.eid = self._cw.varmaker.next()
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        subform = self._cw.vreg['forms'].select('edition', self._cw, entity=trinfo,
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                                            mainform=False)
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        subform.field_by_name('by_transition').widget = fwdgs.HiddenInput()
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        form.form_add_subform(subform)
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        self.w(form.form_render(wf_info_for=entity.eid,
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                                by_transition=transition.eid))
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    def redirectpath(self, entity):
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        return entity.rest_path()
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class WFHistoryView(EntityView):
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    __regid__ = 'wfhistory'
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    __select__ = relation_possible('wf_info_for', role='object')
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    title = _('Workflow history')
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    def cell_call(self, row, col, view=None):
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        _ = self._cw._
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        eid = self.cw_rset[row][col]
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        sel = 'Any FS,TS,WF,D'
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        rql = ' ORDERBY D DESC WHERE WF wf_info_for X,'\
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              'WF from_state FS, WF to_state TS, WF comment C,'\
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              'WF creation_date D'
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        if self._cw.vreg.schema.eschema('CWUser').has_perm(self._cw, 'read'):
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            sel += ',U,C'
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            rql += ', WF owned_by U?'
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            displaycols = range(5)
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            headers = (_('from_state'), _('to_state'), _('comment'), _('date'),
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                       _('CWUser'))
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        else:
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            sel += ',C'
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            displaycols = range(4)
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            headers = (_('from_state'), _('to_state'), _('comment'), _('date'))
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        rql = '%s %s, X eid %%(x)s' % (sel, rql)
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        try:
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            rset = self._cw.execute(rql, {'x': eid}, 'x')
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        except Unauthorized:
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            return
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        if rset:
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            self.wview('table', rset, title=_(self.title), displayactions=False,
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                       displaycols=displaycols, headers=headers)
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class WFHistoryVComponent(component.EntityVComponent):
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    """display the workflow history for entities supporting it"""
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    __regid__ = 'wfhistory'
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    __select__ = WFHistoryView.__select__ & component.EntityVComponent.__select__
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    context = 'navcontentbottom'
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    title = _('Workflow history')
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    def cell_call(self, row, col, view=None):
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        self.wview('wfhistory', self.cw_rset, row=row, col=col, view=view)
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# workflow actions #############################################################
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class WorkflowActions(action.Action):
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    """fill 'workflow' sub-menu of the actions box"""
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    __regid__ = 'workflow'
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    __select__ = (action.Action.__select__ & one_line_rset() &
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                  relation_possible('in_state'))
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    submenu = _('workflow')
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    order = 10
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    def fill_menu(self, box, menu):
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        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)
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        menu.label = u'%s: %s' % (self._cw._('state'), entity.printable_state)
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        menu.append_anyway = True
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        super(WorkflowActions, self).fill_menu(box, menu)
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    def actual_actions(self):
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        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)
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        hastr = False
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        for tr in entity.possible_transitions():
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            url = entity.absolute_url(vid='statuschange', treid=tr.eid)
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            yield self.build_action(self._cw._(tr.name), url)
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            hastr = True
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        # don't propose to see wf if user can't pass any transition
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        if hastr:
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            wfurl = entity.current_workflow.absolute_url()
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            yield self.build_action(self._cw._('view workflow'), wfurl)
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        if entity.workflow_history:
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            wfurl = entity.absolute_url(vid='wfhistory')
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            yield self.build_action(self._cw._('view history'), wfurl)
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# workflow entity types views ##################################################
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class CellView(view.EntityView):
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    __regid__ = 'cell'
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    __select__ = implements('TrInfo')
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    def cell_call(self, row, col, cellvid=None):
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        self.w(self.cw_rset.get_entity(row, col).view('reledit', rtype='comment'))
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class StateInContextView(view.EntityView):
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    """convenience trick, State's incontext view should not be clickable"""
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    __regid__ = 'incontext'
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    __select__ = implements('State')
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    def cell_call(self, row, col):
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        self.w(xml_escape(self._cw.view('textincontext', self.cw_rset,
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                                        row=row, col=col)))
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class WorkflowPrimaryView(primary.PrimaryView):
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    __select__ = implements('Workflow')
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    def render_entity_attributes(self, entity):
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        self.w(entity.view('reledit', rtype='description'))
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        self.w(u'<img src="%s" alt="%s"/>' % (
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            xml_escape(entity.absolute_url(vid='wfgraph')),
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            xml_escape(self._cw._('graphical workflow for %s') % entity.name)))
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# workflow images ##############################################################
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class WorkflowDotPropsHandler(object):
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    def __init__(self, req):
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        self._ = req._
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    def node_properties(self, stateortransition):
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        """return default DOT drawing options for a state or transition"""
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        props = {'label': stateortransition.printable_value('name'),
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                 'fontname': 'Courier'}
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        if hasattr(stateortransition, 'state_of'):
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            props['shape'] = 'box'
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            props['style'] = 'filled'
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            if stateortransition.reverse_initial_state:
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                props['color'] = '#88CC88'
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        else:
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            props['shape'] = 'ellipse'
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            descr = []
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            tr = stateortransition
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            if tr.require_group:
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                descr.append('%s %s'% (
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                    self._('groups:'),
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                    ','.join(g.printable_value('name') for g in tr.require_group)))
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            if tr.condition:
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                descr.append('%s %s'% (
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                    self._('condition:'),
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                    ' | '.join(e.expression for e in tr.condition)))
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            if descr:
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                props['label'] += escape('\n'.join(descr))
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        return props
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    def edge_properties(self, transition, fromstate, tostate):
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        return {'label': '', 'dir': 'forward',
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                'color': 'black', 'style': 'filled'}
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class WorkflowVisitor:
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    def __init__(self, entity):
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        self.entity = entity
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    def nodes(self):
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        for state in self.entity.reverse_state_of:
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            state.complete()
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            yield state.eid, state
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        for transition in self.entity.reverse_transition_of:
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            transition.complete()
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            yield transition.eid, transition
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    def edges(self):
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        for transition in self.entity.reverse_transition_of:
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            for incomingstate in transition.reverse_allowed_transition:
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                yield incomingstate.eid, transition.eid, transition
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            yield transition.eid, transition.destination().eid, transition
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class WorkflowImageView(TmpFileViewMixin, view.EntityView):
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    __regid__ = 'wfgraph'
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    __select__ = implements('Workflow')
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    content_type = 'image/png'
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    def _generate(self, tmpfile):
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        """display schema information for an entity"""
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        entity = self.cw_rset.get_entity(self.cw_row, self.cw_col)
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        visitor = WorkflowVisitor(entity)
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        prophdlr = WorkflowDotPropsHandler(self._cw)
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        generator = GraphGenerator(DotBackend('workflow', 'LR',
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                                              ratio='compress', size='30,12'))
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        return generator.generate(visitor, prophdlr, tmpfile)
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