TreeView Drap and Drop

1. // The ItemDrag event is called when the item drag begins. Here is
2. // where you can perform any tracking, or validate if the drag
3. // operation should occur, and so on.
4. private void myTree_ItemDrag(object sender, ItemDragEventArgs e)
5. {
6.   sourceNode = (TreeNode) e.Item;
7.   DoDragDrop(e.Item.ToString(), DragDropEffects.Move | DragDropEffects.Copy);
8. }
9.  
10. // Define the event that occurs while the dragging happens
11. private void myTree_DragEnter(object sender, DragEventArgs e)
12. {
13.   if (e.Data.GetDataPresent(DataFormats.Text))
14.   {
15.     e.Effect = DragDropEffects.Move;
16.   else
17.     e.Effect = DragDropEffects.None;
18.   }
19. }
20.  
21. // Determine what node in the tree we are dropping on to (target),
22. // copy the drag source (sourceNode), make the new node and delete
23. // the old one.
24. private void myTree_DragDrop(object sender, DragEventArgs e)
25. {
26.   Point pos = myTree.PointToClient(new Point(e.X, e.Y));
27.   TreeNode targetNode = myTree.GetNodeAt(pos);
28.   TreeNode nodeCopy;
29.  
30.   if (targetNode != null)
31.   {
32.     nodeCopy = new TreeNode(sourceNode.Text, sourceNode.ImageIndex, sourceNode.SelectedImageIndex);
33.  
34.     if (sourceNode.Index > targetNode.Index)
35.       targetNode.Parent.Nodes.Insert(targetNode.Index, nodeCopy);
36.     else
37.       targetNode.Parent.Nodes.Insert(targetNode.Index + 1, nodeCopy);
38.  
39.     sourceNode.Remove();
40.     myTree.Invalidate();
41.   }
42. }
    
    
    
    

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