private void ShowAdorner()
{
// the ConnectionAdorner is created once for each Connection
if (this.connectionAdorner == null)
{
DesignerCanvas designer = VisualTreeHelper.GetParent(this) as DesignerCanvas;
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);
if (adornerLayer != null)
{
this.connectionAdorner = new ConnectionAdorner(designer, this);
adornerLayer.Add(this.connectionAdorner);
}
}
this.connectionAdorner.Visibility = Visibility.Visible;
}
public ConnectionAdorner(DesignerCanvas designer, Connection connection)
: base(designer)
{
this.designerCanvas = designer;
adornerCanvas = new Canvas();
this.visualChildren = new VisualCollection(this);
this.visualChildren.Add(adornerCanvas);
this.connection = connection;
this.connection.PropertyChanged += new PropertyChangedEventHandler(AnchorPositionChanged);
InitializeDragThumbs();
drawingPen = new Pen(Brushes.LightSlateGray, 1);
drawingPen.LineJoin = PenLineJoin.Round;
base.Unloaded += new RoutedEventHandler(ConnectionAdorner_Unloaded);
}
void Connection_Unloaded(object sender, RoutedEventArgs e)
{
// do some housekeeping when Connection is unloaded
// remove event handler
this.Source = null;
this.Sink = null;
// remove adorner
if (this.connectionAdorner != null)
{
DesignerCanvas designer = VisualTreeHelper.GetParent(this) as DesignerCanvas;
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);
if (adornerLayer != null)
{
adornerLayer.Remove(this.connectionAdorner);
this.connectionAdorner = null;
}
}
}