private IEnumerable <OutlineItemViewModel> Flatten(OutlineItemViewModel item)
{
foreach (var child in item.Children)
{
yield return(child);
foreach (var flatChild in Flatten(child))
{
yield return(flatChild);
}
}
}
private bool ExistsExpanded(OutlineItemViewModel item, OutlineItemViewModel[] ownItems)
{
return(ownItems.FirstOrDefault(e => e.Data.Text == item.Data.Text || e.Data.TextPosition == item.Data.TextPosition)?.IsExpanded ?? false);
}