public override UndoObject Redo()
{
if (graph != null && !string.IsNullOrEmpty(json))
{
UINode n = graph.AddNodeFromJson(json, point);
if (n != null)
{
foreach (var p in parents)
{
var id = p.Item1;
var cons = p.Item2;
UINode unode = graph.GetNode(id);
if (unode != null)
{
unode.Node.SetConnection(graph.Graph.NodeLookup, cons, n.Id);
unode.LoadConnection(n.Id);
}
}
return(new UndoCreateNode(StackId, n.Id, graph));
}
}
return(null);
}
public async override Task Undo(Action <UndoObject> cb)
{
if (graph != null && !string.IsNullOrEmpty(json))
{
graph.TryAndLoadGraphStack(stack);
await Task.Delay(25);
App.Current.Dispatcher.Invoke(() =>
{
UI.IUIGraphNode n = graph.AddNodeFromJson(json, point);
if (n != null && parents.Count > 0)
{
Task.Delay(100).ContinueWith(t =>
{
App.Current.Dispatcher.Invoke(() =>
{
foreach (var p in parents)
{
UI.IUIGraphNode unode = graph.GetNode(p.parent);
if (unode != null)
{
unode.Node.SetConnection(n.Node, p);
unode.LoadConnection(n.Id);
}
}
//update the graph after reconnections
graph.Graph.TryAndProcess();
});
});
}
if (cb != null)
{
cb.Invoke(new CreateNode(StackId, nid, graph, stack));
}
});
return;
}
if (cb != null)
{
cb.Invoke(null);
}
}