IEnumerable ITreeViewAdvisor.GetNodes(object treeNodeData)
{
if (treeNodeData == null)
{
return(null);
}
if (_treeViewItem.ItemCollection.Count > 0)
{
return(_generator.GetExplicitItem(treeNodeData)?.ItemCollection);
}
var evaluator = GetEvaluator(treeNodeData.GetType());
if (evaluator.SourceEvaluator.IsEmpty == false)
{
// ReSharper disable once ImpureMethodCallOnReadonlyValueField
return(evaluator.SourceEvaluator.GetValue(treeNodeData) as IEnumerable);
}
if (_sourceBinding == null)
{
return(_staticSource);
}
_treeViewItem.DataContext = treeNodeData;
BindingUtil.EnsureBindingAttached(_treeViewItem, TreeViewItem.SourceCollectionProperty);
var itemsSource = _treeViewItem.SourceCollection;
_treeViewItem.DataContext = null;
return(itemsSource);
}
bool ITreeViewAdvisor.IsExpanded(object treeNodeData)
{
if (treeNodeData == null)
{
return(false);
}
var evaluator = GetEvaluator(treeNodeData.GetType());
if (evaluator.IsExpandedEvaluator.IsEmpty == false)
{
// ReSharper disable once ImpureMethodCallOnReadonlyValueField
var value = evaluator.IsExpandedEvaluator.GetValue(treeNodeData);
return(value as bool? ?? false);
}
if (_isExpandedBinding == null)
{
return(_staticIsExpanded);
}
_treeViewItem.DataContext = treeNodeData;
BindingUtil.EnsureBindingAttached(_treeViewItem, TreeViewItem.IsExpandedProperty);
var isExpanded = _treeViewItem.IsExpanded;
_treeViewItem.DataContext = null;
return(isExpanded);
}