void DoDeleteItems(List <ModelItem> itemsToDelete, bool removeIncomingConnectors)
{
HashSet <Connector> connectorsToDelete = new HashSet <Connector>();
List <ModelItem> allStateModelItemsToDelete = new List <ModelItem>();
IEnumerable <ModelItem> selectedStateModelItems = this.Context.Items.GetValue <Selection>().SelectedObjects.
Where <ModelItem>((p) => { return(p.ItemType == typeof(State)); });
foreach (ModelItem stateModelItem in itemsToDelete)
{
allStateModelItemsToDelete.Add(stateModelItem);
allStateModelItemsToDelete.AddRange(GetAllChildStateModelItems(stateModelItem));
}
foreach (ModelItem modelItem in allStateModelItemsToDelete)
{
// We only need to delete incoming connectors to the states to be deleted; outgoing connectors will be deleted
// automatically when the containing state is deleted.
List <Connector> incomingConnectors = StateContainerEditor.GetIncomingConnectors((UIElement)modelItem.View);
foreach (Connector connector in incomingConnectors)
{
ModelItem transitionModelItem = StateContainerEditor.GetConnectorModelItem(connector);
// If the transition is contained by the states to delete, we don't bother to delete it separately.
if (!StateContainerEditor.IsTransitionModelItemContainedByStateModelItems(transitionModelItem, selectedStateModelItems))
{
connectorsToDelete.Add(connector);
}
}
}
// If we don't need to remove incoming connectors, we still remove the transitions but then add them back later.
// This is in order to create an undo unit that contains the change notifications needed to make undo/redo work correctly.
foreach (Connector connector in connectorsToDelete)
{
ModelItem connectorModelItem = StateContainerEditor.GetConnectorModelItem(connector);
if (removeIncomingConnectors || connectorModelItem.ItemType == typeof(Transition))
{
this.DeleteConnectorModelItem(connector);
}
}
if (!removeIncomingConnectors)
{
foreach (Connector connector in connectorsToDelete)
{
ModelItem connectorModelItem = StateContainerEditor.GetConnectorModelItem(connector);
if (connectorModelItem.ItemType == typeof(Transition))
{
StateContainerEditor.GetParentStateModelItemForTransition(connectorModelItem).Properties[StateDesigner.TransitionsPropertyName].Collection.Add(connectorModelItem);
}
}
}
if (null != itemsToDelete)
{
itemsToDelete.ForEach(p => this.DeleteState(p, removeIncomingConnectors));
}
}
public TransitionDesigner()
{
InitializeComponent();
this.Loaded += (sender, e) =>
{
this.ModelItem.PropertyChanged += OnModelItemPropertyChanged;
this.transitionsSharingTrigger.Clear();
ModelItem parentStateModelItem = StateContainerEditor.GetParentStateModelItemForTransition(this.ModelItem);
ModelItem triggerModelItem = this.ModelItem.Properties[TriggerPropertyName].Value;
if (triggerModelItem != null)
{
foreach (ModelItem transitionModelItem in parentStateModelItem.Properties[StateDesigner.TransitionsPropertyName].Collection)
{
if (transitionModelItem != this.ModelItem)
{
if (triggerModelItem == transitionModelItem.Properties[TriggerPropertyName].Value)
{
this.transitionsSharingTrigger.Add(transitionModelItem);
}
}
}
}
// Connectors starting from the same point should share the same trigger
else
{
PointCollection thisPointCollection = this.ViewStateService.RetrieveViewState(this.ModelItem, StateContainerEditor.ConnectorLocationViewStateKey) as PointCollection;
if (thisPointCollection != null && thisPointCollection.Count > 1)
{
foreach (ModelItem transitionModelItem in parentStateModelItem.Properties[StateDesigner.TransitionsPropertyName].Collection)
{
if (transitionModelItem != this.ModelItem)
{
PointCollection pointCollection = this.ViewStateService.RetrieveViewState(transitionModelItem, StateContainerEditor.ConnectorLocationViewStateKey) as PointCollection;
if (pointCollection != null && pointCollection.Count > 1)
{
if (pointCollection[0].IsEqualTo(thisPointCollection[0]))
{
Debug.Assert(transitionModelItem.Properties[TriggerPropertyName].Value == null, "Transition trigger should be null.");
this.transitionsSharingTrigger.Add(transitionModelItem);
}
}
}
}
}
}
if (this.transitionsSharingTrigger.Count > 0)
{
this.IsTriggerShared = true;
}
};
this.Unloaded += (sender, e) =>
{
this.ModelItem.PropertyChanged -= OnModelItemPropertyChanged;
this.transitionsSharingTrigger.Clear();
};
}
internal void DeleteConnectorModelItem(Connector connector)
{
ModelItem connectorModelItem = StateContainerEditor.GetConnectorModelItem(connector);
if (connectorModelItem.ItemType == typeof(Transition))
{
StateContainerEditor.GetParentStateModelItemForTransition(connectorModelItem).Properties[StateDesigner.TransitionsPropertyName].Collection.Remove(connectorModelItem);
}
// Connector from initial node
else if (connectorModelItem.ItemType == typeof(StateMachine))
{
using (EditingScope es = (EditingScope)this.ModelItem.BeginEdit(SR.ClearInitialState))
{
connectorModelItem.Properties[StateMachineDesigner.InitialStatePropertyName].SetValue(null);
es.Complete();
}
}
}
// All the connectors are directly contained by the outmost editor. This is because connectors can go across states.
void OnEditingScopeCompleted(object sender, EditingScopeEventArgs e)
{
Debug.Assert(this.IsOutmostStateContainerEditor(), "Only the outmost editor should listen to the EditingScopeCompleted events of the model tree.");
if (this.transitionModelItemsAdded.Count > 0)
{
// We need to wait until after the state visuals are updated
this.Dispatcher.BeginInvoke(DispatcherPriority.Loaded, new Action(() =>
{
foreach (ModelItem transition in this.transitionModelItemsAdded)
{
ModelItem srcStateModelItem = StateContainerEditor.GetParentStateModelItemForTransition(transition);
this.AddTransitionVisual(transition);
}
this.transitionModelItemsAdded.Clear();
}));
}
if (this.initialStateChanged)
{
Debug.Assert(this.ModelItem.ItemType == typeof(StateMachine), "Only StateMachine should have initial state");
Debug.Assert(this.initialNode != null, "Initial node should not be null");
// Remove the old link
if (GetAttachedConnectors(this.initialNode).Count > 0)
{
this.RemoveConnectorOnOutmostEditor(GetAttachedConnectors(this.initialNode)[0]);
}
// Add the new link if the new initial state is not null
ModelItem initialStateModelItem = this.ModelItem.Properties[StateMachineDesigner.InitialStatePropertyName].Value;
if (initialStateModelItem != null)
{
// We need to wait until after the state visuals are updated
this.Dispatcher.BeginInvoke(DispatcherPriority.Loaded, new Action(() =>
{
this.AddInitialNodeConnector();
}));
}
this.initialStateChanged = false;
}
}