Drag and Drop - Change colour of horizontal drag line

[Barry]

How do you change the colour of the horizontal line (and the icon to the left of that line) that shows where a drop will occur during a drag/drop process in the treeview?

How can the drop options in a treeview be limited, such that for a particular node a drop action will only be allowed to create a sibling of that node or for a different treeview node a drop action will only be able to create a child node?

[Victor]

Hello Barry,

Thanks for writing.

The color of the horizontal line can be changed by setting the DropFeedbackColor property of RadTreeView.

The Drag&Drop restrictions can be made by subscribing to the DragOverNode event of the RadTreeView and setting the RadTreeViewDragCancelEventArgs Cancel property to true depending on the RadTreeViewDragCancelEventArgs Direction property. The following code snippet restricts a node so that only children nodes can be added to it:

void radTreeView1_DragOverNode(object sender, RadTreeViewDragCancelEventArgs e)
{
    if (e.TargetNode.Text == "Node2" && e.Direction != Telerik.WinControls.ArrowDirection.Right)
    {
        e.Cancel = true;
    }
}

Note that Windows Forms also has an enum called ArrowDirection, thus you need to use the fully qualified name of the enum.

Please write again if you have further questions.

All the best,
Victor
the Telerik team

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