private TreeViewItem GetContainerFromStuff(Stuff stuff)
{
Stack <Stuff> _stack = new Stack <Stuff>();
_stack.Push(stuff);
Stuff parent = stuff.Parent;
while (parent != null)
{
_stack.Push(parent);
parent = parent.Parent;
}
ItemsControl container = TheTreeView;
while ((_stack.Count > 0) && (container != null))
{
Stuff top = _stack.Pop();
container = (ItemsControl)container.ItemContainerGenerator.ContainerFromItem(top);
}
return(container as TreeViewItem);
}
private void TheTreeView_Drop(object sender, DragEventArgs e)
{
e.Effects = DragDropEffects.None;
e.Handled = true;
// Verify that this is a valid drop and then store the drop target
TreeViewItem container = GetNearestContainer(e.OriginalSource as UIElement);
if (container != null)
{
Stuff sourceStuff = (Stuff)e.Data.GetData(typeof(Stuff));
Stuff targetStuff = (Stuff)container.Header;
if ((sourceStuff != null) && (targetStuff != null))
{
if (!targetStuff.MoreStuff.Contains(sourceStuff))
{
_targetStuff = targetStuff;
e.Effects = DragDropEffects.Move;
}
}
}
}