UnityEditor.HierarchyProperty.Find C# (CSharp) Method

        public extern bool Find(int instanceID, int[] expanded);
        [MethodImpl(MethodImplOptions.InternalCall)]

		public override DragAndDropVisualMode DoDrag(TreeViewItem parentItem, TreeViewItem targetItem, bool perform, TreeViewDragging.DropPosition dropPos)
		{
			HierarchyProperty hierarchyProperty = new HierarchyProperty(HierarchyType.GameObjects);
			if (parentItem == null || targetItem == null)
			{
				return InternalEditorUtility.HierarchyWindowDrag(null, perform, InternalEditorUtility.HierarchyDropMode.kHierarchyDropUpon);
			}
			if (this.allowDragBetween)
			{
				if (dropPos == TreeViewDragging.DropPosition.Above || targetItem == null || !hierarchyProperty.Find(targetItem.id, null))
				{
					hierarchyProperty = null;
				}
			}
			else
			{
				if (dropPos == TreeViewDragging.DropPosition.Above || parentItem == null || !hierarchyProperty.Find(parentItem.id, null))
				{
					hierarchyProperty = null;
				}
			}
			InternalEditorUtility.HierarchyDropMode hierarchyDropMode = InternalEditorUtility.HierarchyDropMode.kHierarchyDragNormal;
			if (this.allowDragBetween)
			{
				hierarchyDropMode = ((dropPos != TreeViewDragging.DropPosition.Upon) ? InternalEditorUtility.HierarchyDropMode.kHierarchyDropBetween : InternalEditorUtility.HierarchyDropMode.kHierarchyDropUpon);
			}
			if (parentItem != null && parentItem == targetItem && dropPos != TreeViewDragging.DropPosition.Above)
			{
				hierarchyDropMode |= InternalEditorUtility.HierarchyDropMode.kHierarchyDropAfterParent;
			}
			return InternalEditorUtility.HierarchyWindowDrag(hierarchyProperty, perform, hierarchyDropMode);
		}