public void AddItem()
{
DataItem parent = (DataItem)TreeView.SelectedItem;
if (parent == null)
{
parent = TreeView.Items.OfType <DataItem>().First();
}
for (int i = 0; i < 1; i++)
{
DataItem item = new DataItem("New Item " + i);
item.Parent = parent;
parent.Children.Add(item);
}
VirtualizingItemContainer itemContainer = TreeView.GetItemContainer(parent);
if (itemContainer != null)
{
//Update arrow visiblity
TreeView.DataBindItem(parent, itemContainer);
TreeView.Expand(parent);
}
}
void IEndDragHandler.OnEndDrag(PointerEventData eventData)
{
if (TreeView.DropTarget != null)
{
GameObject dropTarget = (GameObject)TreeView.DropTarget;
GameObject newDataItem = new GameObject();
VirtualizingTreeViewItem treeViewItem = (VirtualizingTreeViewItem)TreeView.GetItemContainer(TreeView.DropTarget);
if (TreeView.DropAction == ItemDropAction.SetLastChild)
{
newDataItem.transform.SetParent(dropTarget.transform);
TreeView.AddChild(TreeView.DropTarget, newDataItem);
treeViewItem.CanExpand = true;
treeViewItem.IsExpanded = true;
}
else if (TreeView.DropAction != ItemDropAction.None)
{
int index;
if (TreeView.DropAction == ItemDropAction.SetNextSibling)
{
index = TreeView.IndexOf(dropTarget) + 1;
}
else
{
index = TreeView.IndexOf(dropTarget);
}
newDataItem.transform.SetParent(dropTarget.transform.parent);
newDataItem.transform.SetSiblingIndex(index);
TreeViewItemContainerData newTreeViewItemData = (TreeViewItemContainerData)TreeView.Insert(index, newDataItem);
VirtualizingTreeViewItem newTreeViewItem = (VirtualizingTreeViewItem)TreeView.GetItemContainer(newDataItem);
if (newTreeViewItem != null)
{
newTreeViewItem.Parent = treeViewItem.Parent;
}
else
{
newTreeViewItemData.Parent = treeViewItem.Parent;
}
}
}
TreeView.ExternalItemDrop();
}