web/views/workflow.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Fri, 15 Oct 2010 19:52:06 +0200
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# copyright 2003-2010 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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"""workflow views:
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* IWorkflowable views and forms
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* workflow entities views (State, Transition, TrInfo)
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"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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import os
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from logilab.mtconverter import xml_escape
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from logilab.common.graph import escape
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from cubicweb import Unauthorized, view
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from cubicweb.selectors import (has_related_entities, one_line_rset,
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                                relation_possible, match_form_params,
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                                score_entity, is_instance, adaptable)
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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
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from cubicweb.web.views import forms, primary, autoform, ibreadcrumbs
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from cubicweb.web.views.tabs import TabbedPrimaryView, PrimaryTab
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from cubicweb.web.views.dotgraphview import DotGraphView, DotPropsHandler
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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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_pvs.tag_object_of(('*', 'wf_info_for', '*'), 'hidden')
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for rtype in ('in_state', 'by_transition', 'from_state', 'to_state'):
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    _pvs.tag_subject_of(('*', rtype, '*'), 'hidden')
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    _pvs.tag_object_of(('*', rtype, '*'), 'hidden')
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_pvs.tag_object_of(('*', 'wf_info_for', '*'), '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_subject_of(('*', 'wf_info_for', '*'), False)
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_abaa.tag_object_of(('*', 'wf_info_for', '*'), False)
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_abaa.tag_object_of(('*', 'state_of', 'CWEType'), True)
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_abaa.tag_object_of(('*', 'transition_of', 'CWEType'), True)
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_abaa.tag_subject_of(('Transition', 'destination_state', '*'), True)
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_abaa.tag_object_of(('*', 'allowed_transition', 'Transition'), True)
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_abaa.tag_object_of(('*', 'destination_state', 'State'), True)
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_abaa.tag_subject_of(('State', 'allowed_transition', '*'), True)
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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', '*'), 'main', 'hidden')
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_afs.tag_subject_of(('TrInfo', 'from_state', '*'), 'main', 'hidden')
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_afs.tag_object_of(('State', 'allowed_transition', '*'), 'main', 'attributes')
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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(),
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                    fwdgs.Button(stdmsgs.BUTTON_CANCEL, 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()
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                  & match_form_params('treid')
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                  & adaptable('IWorkflowable'))
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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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        form = self.get_form(entity, transition)
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        self.w(u'<h4>%s %s</h4>\n' % (self._cw._(transition.name),
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                                      entity.view('oneline')))
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        msg = self._cw._('status will change from %(st1)s to %(st2)s') % {
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            'st1': entity.cw_adapt_to('IWorkflowable').printable_state,
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            'st2': self._cw._(transition.destination(entity).name)}
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        self.w(u'<p>%s</p>\n' % msg)
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        self.w(form.render())
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    def redirectpath(self, entity):
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        return entity.rest_path()
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    def get_form(self, entity, transition, **kwargs):
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        # XXX used to specify both rset/row/col and entity in case implements
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        # selector (and not implements) is used on custom form
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        form = self._cw.vreg['forms'].select(
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            'changestate', self._cw, entity=entity, transition=transition,
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            redirect_path=self.redirectpath(entity), **kwargs)
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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('wf_info_for', 'subject').value = entity.eid
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        trfield = subform.field_by_name('by_transition', 'subject')
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        trfield.widget = fwdgs.HiddenInput()
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        trfield.value = transition.eid
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        form.add_subform(subform)
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        return form
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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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                 score_entity(lambda x: x.cw_adapt_to('IWorkflowable').workflow_history)
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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})
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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__ = component.EntityVComponent.__select__ & WFHistoryView.__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'),
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                                  entity.cw_adapt_to('IWorkflowable').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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        iworkflowable = entity.cw_adapt_to('IWorkflowable')
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        hastr = False
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        for tr in iworkflowable.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 = iworkflowable.current_workflow.absolute_url()
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            yield self.build_action(self._cw._('view workflow'), wfurl)
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        if iworkflowable.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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_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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_pvs.tag_object_of(('*', 'default_workflow', '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(('BaseTransition', 'transition_of', 'Workflow'), False)
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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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class WorkflowPrimaryView(TabbedPrimaryView):
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    __select__ = is_instance('Workflow')
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    tabs = [  _('wf_tab_info'), _('wfgraph'),]
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    default_tab = 'wf_tab_info'
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class CellView(view.EntityView):
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    __regid__ = 'cell'
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    __select__ = is_instance('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__ = is_instance('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 WorkflowTabTextView(PrimaryTab):
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    __regid__ = 'wf_tab_info'
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    __select__ = PrimaryTab.__select__ & one_line_rset() & is_instance('Workflow')
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    def render_entity_attributes(self, entity):
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        _ = self._cw._
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        self.w(u'<div>%s</div>' % (entity.printable_value('description')))
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        self.w(u'<span>%s%s</span>' % (_("workflow_of").capitalize(), _(" :")))
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        html = []
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        for e in  entity.workflow_of:
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            view = e.view('outofcontext')
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            if entity.eid == e.default_workflow[0].eid:
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                view += u' <span>[%s]</span>' % _('default_workflow')
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            html.append(view)
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        self.w(', '.join(v for v in html))
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        self.w(u'<h2>%s</h2>' % _("Transition_plural"))
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        rset = self._cw.execute(
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            'Any T,T,DS,T,TT ORDERBY TN WHERE T transition_of WF, WF eid %(x)s,'
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            'T type TT, T name TN, T destination_state DS?', {'x': entity.eid})
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        self.wview('editable-table', rset, 'null',
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                   cellvids={ 1: 'trfromstates', 2: 'outofcontext', 3:'trsecurity',},
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                   headers = (_('Transition'),  _('from_state'),
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                              _('to_state'), _('permissions'), _('type') ),
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                   )
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class TransitionSecurityTextView(view.EntityView):
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    __regid__ = 'trsecurity'
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    __select__ = is_instance('Transition')
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    def cell_call(self, row, col):
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        _ = self._cw._
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        entity = self.cw_rset.get_entity(self.cw_row, self.cw_col)
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        if entity.require_group:
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            self.w(u'<div>%s%s %s</div>' %
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                   (_('groups'), _(" :"),
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                    u', '.join((g.view('incontext') for g
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                               in entity.require_group))))
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        if entity.condition:
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            self.w(u'<div>%s%s %s</div>' %
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                   ( _('conditions'), _(" :"),
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                     u'<br/>'.join((e.dc_title() for e
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                                in entity.condition))))
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class TransitionAllowedTextView(view.EntityView):
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    __regid__ = 'trfromstates'
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    __select__ = is_instance('Transition')
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    def cell_call(self, row, col):
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        entity = self.cw_rset.get_entity(self.cw_row, self.cw_col)
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        self.w(u', '.join((e.view('outofcontext') for e
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                           in entity.reverse_allowed_transition)))
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# workflow entity types edition ################################################
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_afs = uicfg.autoform_section
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_afs.tag_subject_of(('TrInfo', 'to_state', '*'), 'main', 'hidden')
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_afs.tag_subject_of(('TrInfo', 'from_state', '*'), 'main', 'hidden')
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_afs.tag_object_of(('State', 'allowed_transition', '*'), 'main', 'attributes')
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_afs.tag_subject_of(('State', 'allowed_transition', '*'), 'main', 'attributes')
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def workflow_items_for_relation(req, wfeid, wfrelation, targetrelation):
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    wf = req.entity_from_eid(wfeid)
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    rschema = req.vreg.schema[targetrelation]
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    return sorted((e.view('combobox'), e.eid)
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                  for e in getattr(wf, 'reverse_%s' % wfrelation)
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                  if rschema.has_perm(req, 'add', toeid=e.eid))
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class TransitionEditionForm(autoform.AutomaticEntityForm):
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    __select__ = is_instance('Transition')
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   322
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   323
    def workflow_states_for_relation(self, targetrelation):
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        eids = self.edited_entity.linked_to('transition_of', 'subject')
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   325
        if eids:
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   326
            return workflow_items_for_relation(self._cw, eids[0], 'state_of',
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   327
                                               targetrelation)
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   328
        return []
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   329
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   330
    def subject_destination_state_vocabulary(self, rtype, limit=None):
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   331
        if not self.edited_entity.has_eid():
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   332
            return self.workflow_states_for_relation('destination_state')
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   333
        return self.subject_relation_vocabulary(rtype, limit)
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   334
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   335
    def object_allowed_transition_vocabulary(self, rtype, limit=None):
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   336
        if not self.edited_entity.has_eid():
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   337
            return self.workflow_states_for_relation('allowed_transition')
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   338
        return self.object_relation_vocabulary(rtype, limit)
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   339
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   340
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   341
class StateEditionForm(autoform.AutomaticEntityForm):
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    __select__ = is_instance('State')
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   343
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   344
    def subject_allowed_transition_vocabulary(self, rtype, limit=None):
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   345
        if not self.edited_entity.has_eid():
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   346
            eids = self.edited_entity.linked_to('state_of', 'subject')
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   347
            if eids:
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   348
                return workflow_items_for_relation(self._cw, eids[0], 'transition_of',
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   349
                                                   'allowed_transition')
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   350
        return []
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class WorkflowIBreadCrumbsAdapter(ibreadcrumbs.IBreadCrumbsAdapter):
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   353
    __select__ = is_instance('Workflow')
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   354
    # XXX what if workflow of multiple types?
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   355
    def parent_entity(self):
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   356
        return self.entity.workflow_of and self.entity.workflow_of[0] or None
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   357
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   358
class WorkflowItemIBreadCrumbsAdapter(ibreadcrumbs.IBreadCrumbsAdapter):
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   359
    __select__ = is_instance('BaseTransition', 'State')
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   360
    def parent_entity(self):
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   361
        return self.entity.workflow
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   362
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   363
class TransitionItemIBreadCrumbsAdapter(ibreadcrumbs.IBreadCrumbsAdapter):
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   364
    __select__ = is_instance('SubWorkflowExitPoint')
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   365
    def parent_entity(self):
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   366
        return self.entity.reverse_subworkflow_exit[0]
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   367
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   368
class TrInfoIBreadCrumbsAdapter(ibreadcrumbs.IBreadCrumbsAdapter):
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   369
    __select__ = is_instance('TrInfo')
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   370
    def parent_entity(self):
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diff changeset
   371
        return self.entity.for_entity
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diff changeset
   372
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diff changeset
   373
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   374
# workflow images ##############################################################
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   375
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   376
class WorkflowDotPropsHandler(DotPropsHandler):
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   377
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   378
    def node_properties(self, stateortransition):
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   379
        """return default DOT drawing options for a state or transition"""
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diff changeset
   380
        props = super(WorkflowDotPropsHandler, self).node_properties(stateortransition)
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   381
        if hasattr(stateortransition, 'state_of'):
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diff changeset
   382
            props['shape'] = 'box'
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   383
            props['style'] = 'filled'
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diff changeset
   384
            if stateortransition.reverse_initial_state:
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diff changeset
   385
                props['fillcolor'] = '#88CC88'
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diff changeset
   386
        else:
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   387
            props['shape'] = 'ellipse'
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diff changeset
   388
            descr = []
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diff changeset
   389
            tr = stateortransition
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diff changeset
   390
            if descr:
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diff changeset
   391
                props['label'] += escape('\n'.join(descr))
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diff changeset
   392
        return props
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   393
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diff changeset
   394
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Aurelien Campeas <aurelien.campeas@logilab.fr>
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diff changeset
   395
class WorkflowVisitor(object):
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diff changeset
   396
    def __init__(self, entity):
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diff changeset
   397
        self.entity = entity
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   398
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diff changeset
   399
    def nodes(self):
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diff changeset
   400
        for state in self.entity.reverse_state_of:
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diff changeset
   401
            state.complete()
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diff changeset
   402
            yield state.eid, state
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diff changeset
   403
        for transition in self.entity.reverse_transition_of:
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diff changeset
   404
            transition.complete()
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diff changeset
   405
            yield transition.eid, transition
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diff changeset
   406
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diff changeset
   407
    def edges(self):
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parents: 984
diff changeset
   408
        for transition in self.entity.reverse_transition_of:
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parents: 984
diff changeset
   409
            for incomingstate in transition.reverse_allowed_transition:
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parents: 984
diff changeset
   410
                yield incomingstate.eid, transition.eid, transition
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322c3dd96dd5 [workflow] finish refactoring introduced by 021035b9a7ab for 'go back' transition:
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parents: 4436
diff changeset
   411
            for outgoingstate in transition.potential_destinations():
322c3dd96dd5 [workflow] finish refactoring introduced by 021035b9a7ab for 'go back' transition:
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diff changeset
   412
                yield transition.eid, outgoingstate.eid, transition
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diff changeset
   413
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diff changeset
   414
class WorkflowGraphView(DotGraphView):
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parents: 5174
diff changeset
   415
    __regid__ = 'wfgraph'
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parents: 5752
diff changeset
   416
    __select__ = EntityView.__select__ & one_line_rset() & is_instance('Workflow')
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diff changeset
   417
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diff changeset
   418
    def build_visitor(self, entity):
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diff changeset
   419
        return WorkflowVisitor(entity)
9001a74fcc82 more generic dot graph generator
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diff changeset
   420
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diff changeset
   421
    def build_dotpropshandler(self):
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Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 6093
diff changeset
   422
        return WorkflowDotPropsHandler(self._cw)
5224
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parents: 5174
diff changeset
   423
5682
5628247f51ce [security] view was giving web access to every fs file accessible by the web server process. Fix this security hole by storing file in session data, not direct form parameters
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parents: 5426
diff changeset
   424
5628247f51ce [security] view was giving web access to every fs file accessible by the web server process. Fix this security hole by storing file in session data, not direct form parameters
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5426
diff changeset
   425
class TmpPngView(TmpFileViewMixin, view.EntityView):
5628247f51ce [security] view was giving web access to every fs file accessible by the web server process. Fix this security hole by storing file in session data, not direct form parameters
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5426
diff changeset
   426
    __regid__ = 'tmppng'
5628247f51ce [security] view was giving web access to every fs file accessible by the web server process. Fix this security hole by storing file in session data, not direct form parameters
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5426
diff changeset
   427
    __select__ = match_form_params('tmpfile')
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diff changeset
   428
    content_type = 'image/png'
5682
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Sylvain Thénault <sylvain.thenault@logilab.fr>
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diff changeset
   429
    binary = True
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diff changeset
   430
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diff changeset
   431
    def cell_call(self, row=0, col=0):
5682
5628247f51ce [security] view was giving web access to every fs file accessible by the web server process. Fix this security hole by storing file in session data, not direct form parameters
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5426
diff changeset
   432
        tmpfile = self._cw.session.data[self._cw.form['tmpfile']]
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diff changeset
   433
        self.w(open(tmpfile, 'rb').read())
5684
015755f67e46 [workflow image] remove debug code
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5682
diff changeset
   434
        os.unlink(tmpfile)