protected virtual bool CanDragOver(DropPosition dropPosition, TreeNodeElement targetNodeElement)
{
RadTreeViewElement targetTreeView = targetNodeElement.TreeViewElement;
if (!targetNodeElement.Enabled || !targetTreeView.ElementTree.Control.AllowDrop || !this.IsInValidState(targetTreeView))
{
return(false);
}
RadTreeNode targetNode = targetNodeElement.Data;
List <RadTreeNode> nodes = new List <RadTreeNode>(draggedNode.TreeViewElement.SelectedNodes);
// If the count is empty, we are in single selection mode
if (nodes.Count == 0)
{
nodes.Add(draggedNode);
}
foreach (RadTreeNode selected in nodes)
{
if (selected == targetNode)
{
return(false);
}
RadTreeNode parent = targetNode.Parent;
while (parent != null)
{
if (parent == selected)
{
return(false);
}
parent = parent.Parent;
}
if (dropPosition == DropPosition.AsChildNode && selected.Parent == targetNode)
{
return(false);
}
}
if (dropPosition == DropPosition.AsChildNode)
{
targetTreeView.AutoExpand(targetNode);
}
targetTreeView.AutoScroll(targetNodeElement);
return(true);
}
protected virtual bool CanDragOver(DropPosition dropPosition, TreeNodeElement targetNodeElement)
{
RadTreeViewElement treeViewElement = targetNodeElement.TreeViewElement;
if (!targetNodeElement.Enabled || !treeViewElement.ElementTree.Control.AllowDrop || !this.IsInValidState(treeViewElement) || !targetNodeElement.Data.AllowDrop && dropPosition == DropPosition.AsChildNode)
{
return(false);
}
RadTreeNode data = targetNodeElement.Data;
List <RadTreeNode> radTreeNodeList = new List <RadTreeNode>((IEnumerable <RadTreeNode>) this.draggedNode.TreeViewElement.SelectedNodes);
if (radTreeNodeList.Count == 0)
{
radTreeNodeList.Add(this.draggedNode);
}
foreach (RadTreeNode radTreeNode in radTreeNodeList)
{
if (radTreeNode == data)
{
return(false);
}
for (RadTreeNode parent = data.Parent; parent != null; parent = parent.Parent)
{
if (parent == radTreeNode)
{
return(false);
}
}
if (dropPosition == DropPosition.AsChildNode && radTreeNode.Parent == data)
{
return(false);
}
}
if (dropPosition == DropPosition.AsChildNode && !data.Expanded && data.HasNodes)
{
treeViewElement.AutoExpand(data);
this.HintWindow.Hide();
this.HintWindow.Show();
}
if (treeViewElement.AutoScrollOnDragging(targetNodeElement))
{
this.HintWindow.Hide();
this.HintWindow.Show();
}
return(true);
}
