private void Button_Click(object sender, RoutedEventArgs e)
{
Button button = sender as Button;
if (button == null)
{
return;
}
Node node = Part.FindAncestor <Node>(button);
if (node == null)
{
return;
}
myDiagram.StartTransaction("ExpandCollapse");
// Hide/show children of this node via the particular Button which also acts as the "port"
String pid = Node.GetPortId(button);
if (node.FindLinksOutOfPort(pid).Any(l => l.Visibility == Visibility.Collapsed))
{
ExpandTree(node, pid);
}
else
{
CollapseTree(node, pid);
}
myDiagram.CommitTransaction("ExpandCollapse");
}
public void CollapseTree(Node node, String portid)
{
foreach (Link l in node.FindLinksOutOfPort(portid))
{
Node n = l.GetOtherNode(node);
if (n != null && n != node)
{
// Hide both the link and the node
l.Visible = false;
n.Visible = false;
// Recursively collapse all children
CollapseTree(n, null);
}
}
}
public void ExpandTree(Node node, String portid)
{
foreach (Link l in node.FindLinksOutOfPort(portid))
{
Node n = l.GetOtherNode(node);
if (n != null && n != node)
{
// Calculate a reasonable initial location for the layout animation;
// LayoutDiagram (called due to CommitTransaction) will move it to its proper location
n.Location = Spot.TopRight.PointInRect(node.Bounds);
// Show both the link and the node
l.Visible = true;
n.Visible = true;
}
}
}