private void OnDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
{
var node = DataContext as INode;
if (node == null)
{
// there seem to be reasons where DataContext is MS.Internal.NamedObject
// but it is unclear yet which reasons.
// -> ignore this invalid state for the moment
return;
}
State = myStateContainer.GetOrCreate(node);
State.Attach(this);
var childrenCount = (TextBlock)GetTemplateChild("PART_ChildrenCount");
if (childrenCount != null)
{
var expr = BindingOperations.GetMultiBindingExpression(childrenCount, TextBlock.TextProperty);
expr.UpdateTarget();
}
}
public NodeState GetParent(NodeState state)
{
return(state.DataContext.Parent == null ? null : myContainer.GetOrCreate(state.DataContext.Parent));
}
