protected void SetRootNodes(IEnumerable <TreeViewItemViewModel> source, string defaultText = "")
{
_currentRootNodesViewModel = source.ToList();
if (_currentRootNodesViewModel.Count == 0 && !string.IsNullOrEmpty(defaultText))
{
_currentRootNodesViewModel.Add(new TextItemViewModel(_imageSourceFactory, null, defaultText));
}
_rootNodes.Clear();
_currentRootNodesViewModel.ForAll(x => _rootNodes.Add(x));
}
protected void SetRootNodes(List <TreeViewItemViewModel> newRootNodes)
{
// Don't update if we are passed in the already active collection.
if (object.ReferenceEquals(_activeRootNodes, newRootNodes))
{
return;
}
_activeRootNodes = newRootNodes;
// Move the active root nodes into the observable collection so that
// the TreeView is refreshed.
_rootNodes.Clear();
_activeRootNodes.ForAll(_rootNodes.Add);
this.OnRootNodesChanged();
}