private void LinkAction(object sender, DragEventArgs args)
{
if (args.Data.GetDataPresent(typeof(ViewEdgePreview)))
{
var viewEdgePreview = args.Data.GetData(typeof(ViewEdgePreview)) as ViewEdgePreview;
if (viewEdgePreview.StartNode == null)
{
return;
}
if (viewEdgePreview.DropPosition.HasValue == false)
{
return;
}
var canvas = (viewEdgePreview.StartNode.Parent as Canvas);
foreach (FrameworkElement child in canvas.Children)
{
var top = Canvas.GetTop(child);
var left = Canvas.GetLeft(child);
var bottom = top + child.DesiredSize.Height;
var right = left + child.DesiredSize.Width;
var boundingBox = new Rect(
new Point(left, top), new Size(child.DesiredSize.Width, child.DesiredSize.Height)
);
if (boundingBox.Contains(viewEdgePreview.DropPosition.Value))
{
var newEdge = new ViewEdge();
newEdge.Connect(viewEdgePreview.StartNode, (child as ViewNodeControl));
EdgesList.Add(newEdge);
return;
}
}
}
}
public ViewEdge AddEdge(ViewEdge viewEdge)
{
EdgesList.Add(viewEdge);
return(viewEdge);
}