private AdornerDataThumb<ModelItem, Connector> GetConnectorThumb(Connector conn)
{
AdornerDataThumb<ModelItem, Connector> thumb = new AdornerDataThumb<ModelItem, Connector>(AdornedElement as ModelItem, conn);
thumb.Style = FindResource("ConnectorStyle_" + conn.Type.ToString()) as Style;
thumb.DragDelta += OnDragDelta_DetectPath;
thumb.DragCompleted += OnDragCompleted_Connect;
return thumb;
}
/// <summary>
/// Do hit test, if the target is a thumb (another connector), then return it
/// </summary>
/// <param name="hitPoint"></param>
/// <returns></returns>
private static Connector HitTest(AdornerDataThumb<ModelItem, Connector> thumb, Point hitPoint)
{
ModelItem elem = thumb.AdornedParent; Canvas canvas = elem.ContainerCanvas; HitTestResult hitRes = VisualTreeHelper.HitTest(canvas, hitPoint); DependencyObject hitObj = null;
Model model = elem.ContentObject; ModelItem res = null;
if (hitRes != null)
hitObj = hitRes.VisualHit;
while (hitObj != null && hitObj != canvas && (res = hitObj as ModelItem) == null)
hitObj = VisualTreeHelper.GetParent(hitObj);
#if DEBUG_ON
// test value
System.Console.WriteLine("{0} hitObj {1} ", System.DateTime.Now.Millisecond, hitObj.GetType());
#endif
// test fails
if (res == null || res == elem)
return null;
// spilit the rectangle into four areas with two line: y=-h/w*x+h, y=h/w*x
double width = res.Size.Width, height = res.Size.Height;
Vector relativeVector = hitPoint - res.Position;
double y1 = relativeVector.X * height / width, y2 = -y1 + height;
ConnectorType type = ConnectorType.Center;
// now calculate which connector is that
if (relativeVector.Y < y1 && relativeVector.Y < y2)
type = ConnectorType.Top;
else if (relativeVector.Y > y1 && relativeVector.Y < y2)
type = ConnectorType.Left;
else if (relativeVector.Y > y1 && relativeVector.Y > y2)
type = ConnectorType.Bottom;
else if (relativeVector.Y < y1 && relativeVector.Y > y2)
type = ConnectorType.Right;
#if DEBUG_ON
// test value
System.Console.WriteLine("{0} Connector.Type {1} width {2} height {3}", System.DateTime.Now.Millisecond, type.ToString(), width, height);
#endif
return res.ContentObject.GetConnector(type);
}
