void treeView_OnDragDropSuccess(DragDropTreeViewItem source, DragDropTreeViewItem target, System.ComponentModel.CancelEventArgs e)
{
if (!(source.Tag is GameObject))
{
e.Cancel = true;
return;
}
List <TreeViewItem> movedItems = TreeViewExtension.GetSelectedTreeViewItems(treeView);
// verify if the moved items will not be placed on any of their children or in themselfs
foreach (var ti in movedItems)
{
var tx = (DragDropTreeViewItem)ti;
if (ti == target)
{
// trying to drop on one of the moved items
e.Cancel = true;
return;
}
if (DragDropTreeView.TreeContainsNode(treeView, tx, target))
{
e.Cancel = true;
return;
}
}
if (target.Tag is GameObject)
{
foreach (var ti in movedItems)
{
GameObject _source = ti.Tag as GameObject;
// no parent?
if (_source.Transform.Parent == null)
{
SceneManager.ActiveScene.GameObjects.Remove(_source, false);
}
else
{
GameObject parent = (ti.Parent as DragDropTreeViewItem).Tag as GameObject;
parent.Children.Remove(_source, false);
}
if (DragDropHelper.insertionPlace == DragDropHelper.InsertionPlace.Center)
{
(target.Tag as GameObject).Children.Insert(0, _source);
}
else
{
int index = 0;
// no parent?
if ((target.Tag as GameObject).Transform.Parent == null)
{
index = SceneManager.ActiveScene.GameObjects.IndexOf(target.Tag as GameObject);
}
else
{
GameObject parent = (target.Parent as DragDropTreeViewItem).Tag as GameObject;
index = parent.Children.IndexOf(target.Tag as GameObject);
}
if (DragDropHelper.insertionPlace == DragDropHelper.InsertionPlace.Top)
{
index++;
}
if ((target.Tag as GameObject).Transform.Parent == null)
{
SceneManager.ActiveScene.GameObjects.Insert(index, _source);
}
else
{
GameObject parent = (target.Parent as DragDropTreeViewItem).Tag as GameObject;
parent.Children.Insert(index, _source);
}
}
}
}
else
{
e.Cancel = true;
}
}
// Determine whether one node is a parent
// or ancestor of a second node.
private bool ContainsNode(DragDropTreeViewItem node1, DragDropTreeViewItem node2)
{
return(DragDropTreeView.TreeContainsNode(this, node1, node2));
}