void CreateStartSymbol()
{
//Instantiate the start symbol
StartSymbol start = System.Activities.Core.Presentation.StartSymbol.CreateStartSymbol(this.Context);
start.Text = "Start";
this.flowStart = start.ModelItem;
DragDropHelper.SetCompositeView(start, this);
modelElement.Add(flowStart, start);
start.SizeChanged += new SizeChangedEventHandler(ChildSizeChanged);
this.StartSymbol = start;
PopulateConnectionPoints(this.StartSymbol, null);
this.StartSymbol.MouseEnter += new MouseEventHandler(ChildElement_MouseEnter);
this.StartSymbol.MouseLeave += new MouseEventHandler(ChildElement_MouseLeave);
//Getting the View state information.
object locationOfShape = this.ViewStateService.RetrieveViewState(this.ModelItem, shapeLocation);
object sizeOfShape = this.ViewStateService.RetrieveViewState(this.ModelItem, shapeSize);
if (locationOfShape != null)
{
Point locationPt = (Point)locationOfShape;
FreeFormPanel.SetLocation(this.StartSymbol, locationPt);
}
else
{
//Set the location of the start symbol.
this.StartSymbol.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
double startHeight = this.StartSymbol.DesiredSize.Height;
double startWidth = this.StartSymbol.DesiredSize.Width;
Point startPoint = new Point(panel.MinWidth / 2, startSymbolTopMargin + startHeight / 2);
Point startLocation = SnapVisualToGrid(this.StartSymbol, startPoint, new Point(-1, -1), false);
FreeFormPanel.SetLocation(this.StartSymbol, startLocation);
this.internalViewStateChange = true;
this.StoreShapeViewState(this.ModelItem, startLocation);
this.internalViewStateChange = false;
}
if (sizeOfShape != null)
{
FreeFormPanel.SetChildSize(this.StartSymbol, (Size)sizeOfShape);
}
}
void OnViewStateChanged(object sender, ViewStateChangedEventArgs e)
{
Debug.Assert(e.ParentModelItem != null, "ViewState should be associated with some modelItem");
if (!this.internalViewStateChange)
{
if (e.ParentModelItem == this.ModelItem)
{
if (string.Equals(e.Key, StateContainerWidthViewStateKey, StringComparison.Ordinal))
{
double defaultWidth = ((this.ModelItem.ItemType == typeof(State)) ? DefaultStateWidth : DefaultStateMachineWidth);
object widthViewState = this.ViewStateService.RetrieveViewState(this.ModelItem, StateContainerWidthViewStateKey);
this.StateContainerWidth = (widthViewState != null) ? (double)widthViewState : defaultWidth;
}
else if (string.Equals(e.Key, StateContainerHeightViewStateKey, StringComparison.Ordinal))
{
double defaultHeight = ((this.ModelItem.ItemType == typeof(State)) ? DefaultStateHeight : DefaultStateMachineHeight);
object heightViewState = this.ViewStateService.RetrieveViewState(this.ModelItem, StateContainerHeightViewStateKey);
this.StateContainerHeight = (heightViewState != null) ? (double)heightViewState : defaultHeight;
}
}
if (e.ParentModelItem.ItemType == typeof(State) && e.Key.Equals(ShapeLocationViewStateKey))
{
if (this.modelItemToUIElement.ContainsKey(e.ParentModelItem))
{
if (e.NewValue != null)
{
FreeFormPanel.SetLocation(this.modelItemToUIElement[e.ParentModelItem], (Point)e.NewValue);
this.panel.InvalidateMeasure();
if (e.OldValue != null)
{
this.shapeLocations.Remove((Point)e.OldValue);
}
this.shapeLocations.Add((Point)e.NewValue);
// To reroute the links
this.InvalidateMeasureForOutmostPanel();
}
}
}
else if (e.ParentModelItem.ItemType == typeof(State) && e.Key.Equals(ShapeSizeViewStateKey))
{
// To reroute the links
this.InvalidateMeasureForOutmostPanel();
}
// Only the outmost editor should respond to connector changes because all connectors are
// only added to the outmost editor
else if (e.Key.Equals(ConnectorLocationViewStateKey) && this.IsOutmostStateContainerEditor())
{
Connector changedConnector = this.GetConnectorOnOutmostEditor(e.ParentModelItem);
if (changedConnector != null)
{
if (e.NewValue != null)
{
Debug.Assert(e.NewValue is PointCollection, "e.NewValue is not PointCollection");
changedConnector.Points = e.NewValue as PointCollection;
this.panel.RemoveConnectorEditor();
this.InvalidateMeasureForOutmostPanel();
if (IsConnectorFromInitialNode(changedConnector))
{
this.initialStateChanged = true;
}
}
}
}
}
}
void OnViewStateChanged(object sender, ViewStateChangedEventArgs e)
{
Fx.Assert(this.panel != null, "This code should not be hit if panel is null");
Fx.Assert(e.ParentModelItem != null, "ViewState should be associated with some modelItem");
Connector changedConnector = null;
if (e.ParentModelItem == this.ModelItem)
{
if (string.Equals(e.Key, FlowchartSizeFeature.WidthPropertyName, StringComparison.Ordinal))
{
this.FlowchartWidth = (double)TypeDescriptor.GetProperties(this.ModelItem)[FlowchartSizeFeature.WidthPropertyName].GetValue(this.ModelItem);
}
else if (string.Equals(e.Key, FlowchartSizeFeature.HeightPropertyName, StringComparison.Ordinal))
{
this.FlowchartHeight = (double)TypeDescriptor.GetProperties(this.ModelItem)[FlowchartSizeFeature.HeightPropertyName].GetValue(this.ModelItem);
}
}
if ((IsFlowNode(e.ParentModelItem) || this.ModelItem.Equals(e.ParentModelItem)) && !this.internalViewStateChange)
{
ModelItem itemOnCanvas = this.GetCorrespondingElementOnCanvas(e.ParentModelItem);
if (this.modelElement.ContainsKey(itemOnCanvas))
{
if (e.Key.Equals(shapeLocation))
{
if (e.NewValue != null)
{
FreeFormPanel.SetLocation(this.modelElement[itemOnCanvas], (Point)e.NewValue);
this.panel.InvalidateMeasure();
if (e.OldValue != null)
{
this.shapeLocations.Remove((Point)e.OldValue);
}
this.shapeLocations.Add((Point)e.NewValue);
}
}
else
{
if (this.ModelItem.Equals(e.ParentModelItem) &&
e.Key.Equals(ConnectorViewStateKey))
{
changedConnector = this.GetLinkOnCanvas(e.ParentModelItem, e.ParentModelItem.Properties["StartNode"].Value, "StartNode");
}
else if (typeof(FlowStep).IsAssignableFrom(e.ParentModelItem.ItemType) &&
e.Key.Equals(ConnectorViewStateKey))
{
changedConnector = this.GetLinkOnCanvas(e.ParentModelItem, e.ParentModelItem.Properties["Next"].Value, "Next");
}
else if (typeof(FlowDecision).IsAssignableFrom(e.ParentModelItem.ItemType))
{
if (e.Key.Equals(TrueConnectorViewStateKey))
{
changedConnector = this.GetLinkOnCanvas(e.ParentModelItem, e.ParentModelItem.Properties["True"].Value, "True");
}
else if (e.Key.Equals(FalseConnectorViewStateKey))
{
changedConnector = this.GetLinkOnCanvas(e.ParentModelItem, e.ParentModelItem.Properties["False"].Value, "False");
}
}
else if (GenericFlowSwitchHelper.IsGenericFlowSwitch(e.ParentModelItem.ItemType))
{
if (e.Key.Equals(FlowchartDesigner.FlowSwitchDefaultViewStateKey, StringComparison.CurrentCulture))
{
changedConnector = this.GetLinkOnCanvas(e.ParentModelItem, e.ParentModelItem.Properties["Default"].Value, e.Key);
}
else if (e.Key.EndsWith(CaseViewStateKeyAppendString, StringComparison.CurrentCulture))
{
string switchCaseName = e.Key.Substring(0, e.Key.Length - CaseViewStateKeyAppendString.Length);
object switchCase = switchCaseName;
Type genericType = e.ParentModelItem.ItemType.GetGenericArguments()[0];
switchCase = GenericFlowSwitchHelper.GetObject(switchCaseName, genericType);
if (GenericFlowSwitchHelper.ContainsCaseKey(e.ParentModelItem.Properties["Cases"], switchCase))
{
//Prepending with GenericFlowSwitchHelper.FlowSwitchCasesKeyIdentifier to differentiate between the property Default and the key Default.
changedConnector = this.GetLinkOnCanvas(e.ParentModelItem, GenericFlowSwitchHelper.GetCaseModelItem(e.ParentModelItem.Properties["Cases"], switchCase), GenericFlowSwitchHelper.FlowSwitchCasesKeyIdentifier + switchCase);
}
}
}
}
}
}
if (changedConnector != null)
{
if (e.NewValue != null)
{
Fx.Assert(e.NewValue is PointCollection, "e.NewValue is not PointCollection");
changedConnector.Points = e.NewValue as PointCollection;
this.panel.RemoveConnectorEditor();
this.panel.InvalidateMeasure();
}
}
}
