Prevent drag drop on child nodes of DotNetBar AdvTree/TreeControl

Question

I'm implementing a TreeControl using the DotNetBar Advtree component. However I seem to be struggling to find the property to make it impossible for a particular node to have any children. What I want to stop the following below;

For example an RSS feed cannot be contained with an RSS feed. Some in effect I want some nodes to be draggable, and can have children, and others only draggable.

Thanks for any help. I've noticed the property NodesIndent which I've setting to -1, or 5000 but neither was any help.

Answer 1

Just spotted in the documentation;

“Gets or sets the new insert position inside of NewParentNode.Nodes collection for the node being dragged. If InsertPosition is -1 the ParentNode refers to the current mouse over node and drag & drop node will be added as child node to it.”

So basically I can capture whether or not it is being added to as child node, compare the node type and decide whether to accept the drop.

Answer 2

According to http://www.devcomponents.com/kb2/?p=327, there is a DragDropEnabled property to control this. If that does not work, handle the BeforeNodeDragStart event and cancel the drag.

[Edit: Added the following]

To prevent dragging a node under certain nodes and not others, handle the BeforeNodeDrop event and setting Cancel=true if the node being dragged cannot be added as a child to the destination node.