Re-parenting a node using drag and drop

[Jon Barron]

Hi,

I've implemented drag & drop on a treeview, and one of the functions is to be able to drag a node that exists under one parent and drop it into some other parent.

This works fine if the destination parent already has children, but when the intended parent has no child nodes, the dropped item is moved as a sibling of the intended parent, rather than being added as a child. I looked for a demo of this behavior and was unable to find a solution.

Can ya help a brother out please?

[Tina Stancheva]

Hi Jon Barron,

Do you databind the RadTreeView? If this is the case, then you should keep in mind a couple of things.

Firstly, in order to implement the Drag and Drop feature on a databound tree, then you have to bind its ItemsSource to a collection that implements the INotifyCollectionChanged interface.

Secondly, you should keep in mind that a drop is allowed only on RadTreeViewItems, which corresponding dataitems' definition contains a children collection.

I prepared a sample project for you to have a look at. I hope it helps. Please let us know if we can further assist you.

Kind regards,
Tina Stancheva
the Telerik team