// Override DragOver to implement highlighting of links and nodes when dragged over
protected override void DragOver(Point pt, bool moving, bool copying)
{
// Make the dragged node less opaque
ClearOpacities();
this.CurrentPart = FindPartAt(this.Diagram.LastMousePointInModel, false);
Node node = this.CurrentPart as Node;
if (node != null)
{
MyNodeData mnd = node.Data as MyNodeData;
if (mnd != null)
{
mnd.Opacity = .5;
}
}
this.DropOntoEnabled = true;
if (this.DropOntoEnabled && this.Diagram.Model.Modifiable)
{
Part overpart = this.Diagram.Panel.FindElementsAt <Part>(pt,
Part.FindAncestor <Part>,
p => !this.Diagram.SelectedParts.Contains(p),
SearchLayers.Parts).FirstOrDefault();
this.DragOverPart = overpart;
// When overpart changes, clear any previous highlights
ClearHighlights();
// Highlights the part being dragged over if it is a link or a node
Link l = overpart as Link;
if (l != null)
{
MyLinkData mld = l.Data as MyLinkData;
if (mld != null)
{
mld.Highlight = true;
}
}
else
{
Node n = overpart as Node;
if (n != null)
{
MyNodeData mnd = n.Data as MyNodeData;
// Don't highlight "Start" node
if (mnd != null && mnd.Category != "Start")
{
mnd.Highlight = true;
}
}
}
}
if (this.Diagram.AllowScroll && (moving || copying))
{
this.Diagram.Panel.DoAutoScroll(pt);
}
}
public override object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
Link link = value as Link;
if (link != null && link.FromNode != null && link.FromPortId == "LeftPort")
{
MyNodeData d = link.FromNode.Data as MyNodeData;
if (d != null && d.Key.StartsWith("If"))
{
return(Visibility.Visible);
}
}
return(Visibility.Collapsed);
}
// Mark a node as being part of the subgraph
private void Mark(Node n, int i)
{
if (n == null)
{
return;
}
MyNodeData mnd = n.Data as MyNodeData;
mnd.UserFlags |= i;
foreach (Node x in n.NodesOutOf)
{
Mark(x, i);
}
}
// Clear the UserFlags on a given node and all nodes out of it
private void Clear(Node n)
{
if (n == null)
{
return;
}
MyNodeData mnd = n.Data as MyNodeData;
mnd.UserFlags = 0;
foreach (Node x in n.NodesOutOf)
{
Clear(x);
}
}
// Now add marked nodes to the collection
private void SelectMarked(Node n, int i, HashSet <Part> coll)
{
if (n == null)
{
return;
}
MyNodeData mnd = n.Data as MyNodeData;
if (mnd.UserFlags != i)
{
coll.Add(n);
foreach (Node x in n.NodesOutOf)
{
SelectMarked(x, i, coll);
}
}
}
// Find the node where the two sides of the subgraph meet back up
private Node FindJoin(Node n, int i)
{
if (n == null)
{
return(null);
}
MyNodeData mnd = n.Data as MyNodeData;
if (mnd.UserFlags == i)
{
return(n);
}
foreach (Node x in n.NodesOutOf)
{
Node r = FindJoin(x, i);
if (r != null)
{
return(r);
}
}
return(null);
}