def updateModel(self):
'''
Clears the QGraphicScene and re-populates it with what is currently
in the WorkflowScene.
'''
QtGui.QGraphicsScene.clear(self)
meta_steps = {}
connections = []
for workflowitem in self._workflow_scene.items():
if workflowitem.Type == MetaStep.Type:
node = Node(workflowitem)
workflowitem._step.registerConfiguredObserver(self.stepConfigured)
workflowitem._step.registerDoneExecution(self.doneExecution)
workflowitem._step.registerOnExecuteEntry(self.setCurrentWidget, self.setWidgetUndoRedoStack)
workflowitem._step.registerIdentifierOccursCount(self.identifierOccursCount)
# Put the node into the scene straight away so that the items scene will
# be valid when we set the position.
QtGui.QGraphicsScene.addItem(self, node)
node.setPos(workflowitem.pos())
self.blockSignals(True)
node.setSelected(workflowitem.selected())
self.blockSignals(False)
meta_steps[workflowitem] = node
elif workflowitem.Type == Connection.Type:
connections.append(workflowitem)
for connection in connections:
src_port_item = meta_steps[connection.source()]._step_port_items[connection.sourceIndex()]
destination_port_item = meta_steps[connection.destination()]._step_port_items[connection.destinationIndex()]
arc = Arc(src_port_item, destination_port_item)
# Overwrite the connection created in the Arc with the original one that is in the
# WorkflowScene
arc._connection = connection
# Again put the arc into the scene straight away so the scene will be valid
QtGui.QGraphicsScene.addItem(self, arc)
self.blockSignals(True)
arc.setSelected(connection.selected())
self.blockSignals(False)
self._previousSelection = self.selectedItems()
