IDictionary <ChangedDescendantInfo <TNode>, IEnumerable <TNode> > desChangedRange()
{
//祖先宛の子孫変更通知
//同一ツリー内での移動
var dic = new Dictionary <ChangedDescendantInfo <TNode>, IEnumerable <TNode> >();
var dArg = new ChangedDescendantInfo <TNode>(TreeNodeChangedAction.Deviate, _self, OldParent, oldIndex);
var jArg = new ChangedDescendantInfo <TNode>(TreeNodeChangedAction.Join, _self, OldParent, oldIndex);
if (object.Equals(PreOldRoot, _self.Upstream().Last()))
{
var mArg = new ChangedDescendantInfo <TNode>(TreeNodeChangedAction.Move, _self, OldParent, oldIndex);
var deviate = preOldAnc.Except(_self.Upstream().Skip(1));
var join = _self.Upstream().Skip(1).Except(preOldAnc);
var move = preOldAnc.Intersect(_self.Upstream().Skip(1));
if (deviate.Any())
{
dic.Add(dArg, deviate);
}
if (join.Any())
{
dic.Add(jArg, join);
}
if (move.Any())
{
dic.Add(mArg, move);
}
}
else
{
if (OldParent != null)
{
dic.Add(dArg, OldParent.Upstream());
}
if (NewParent != null)
{
dic.Add(jArg, NewParent.Upstream());
}
}
return(dic);
}