public override void ChangeEdge(TEdge sinkEdge, TItem newItem, bool changeRoot)
{
Func <TItem> getItem = () => changeRoot ? sinkEdge.Root : sinkEdge.Leaf;
Action <TItem> setItem = item => { if (changeRoot)
{
sinkEdge.Root = item;
}
else
{
sinkEdge.Leaf = item;
} };
var itemBefore = getItem();
Source.ChangeEdge(sinkEdge, newItem, changeRoot);
var lockObj = (object)sinkEdge;
lock (lockObj) {
// revert the changes, otherwise edge is not removed from Sink.Edges(itemBefore)
setItem(itemBefore);
Sink.ChangeEdge(sinkEdge, newItem, changeRoot);
// ensure the changes are done
if (!object.Equals(getItem(), newItem))
{
setItem(newItem);
}
}
}
public bool ChangeEdge(IVisualEdge edge, IVisual target, bool asRoot)
{
bool result = true;
// test if there is a loop:
if (target is IVisualEdge)
{
foreach (var visual in this.Twig(edge))
{
if (visual == target)
{
return(false);
}
}
}
Graph.ChangeEdge(edge, target, asRoot);
if (result)
{
State.Dirty = true;
}
return(result);
}
