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Drag & Drop in Tree view

, 3 Jun 2003
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This is basically an article which demonstrates the Drag & Drop operation in a TreeView.

Sample Image - TreeDragnDrop.jpg

Introduction

I needed drag 'n' drop facility in TreeView control, which I guess is quite a common functionality. But I couldn't find it, so I implemented it.

Thinking it might be useful to other people, I am sharing the code here.

Implementation

In this app, I have provided the functionality to add children or siblings to a node via toolbar.

Events that are required to be implemented are:

  1. ItemDrag
  2. DragDrop
  3. DragEnter

of the TreeView control.

In DragItem event, simply store the selected node that is the node to be dragged, in a TreeNode type class variable & call DoDragDrop as shown below:

NodeToBeDeleted = (TreeNode)e.Item;
   string strItem = e.Item.ToString();
   DoDragDrop(strItem, DragDropEffects.Copy | DragDropEffects.Move);

In DragEnter, set appropriate effects.

In DragDrop, do the following steps:

  1. Get the current mouse position, that is coordinates where to drop the dragged node.
  2. Use PointToClient method of the TreeView control to get the coordinates relative to the TreeView control.

  3. Get the node at this position (that is the node on which to drop the dragged node)
  4. Then delete the node dragged from its current position & insert it at the next index of the node at which to drop. That's it.
Position.X = e.X;
   Position.Y = e.Y;
   Position = treeView1.PointToClient(Position);
   TreeNode DropNode = this.treeView1.GetNodeAt(Position);
   if (DropNode != null && DropNode.Parent == this.NodeToBeDeleted.Parent )
   {
    TreeNode DragNode = this.NodeToBeDeleted;
    DropNode.Parent.Nodes.Remove(this.NodeToBeDeleted);
    DropNode.Parent.Nodes.Insert(DropNode.Index+1, DragNode);
   }

Now the code is ready to be executed

Conclusion

I hope it helps u ppl. All the best.

Do give feedback on this article as positive criticism is always healthy for growth.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

ItsAWonderfulLife
Web Developer
Sweden Sweden
No Biography provided

Comments and Discussions

 
GeneralMy vote of 1 PinmemberPrasyee13-Sep-12 1:04 
GeneralMy vote of 3 PinmemberMember 856357826-Aug-12 15:59 
GeneralGood to start understanding how it works but not optimized and buggy... Pinmemberkrypto_46730-Mar-12 4:49 
GeneralDrag & Drop treeview nodes Pinmemberqzeb15-Sep-06 2:14 
GeneralGreat article, but not the same in Managed C++ PinmemberScott mLeffler18-Oct-05 8:04 
Generalanother small bug Pinmemberfelimonchik29-Aug-05 9:08 
GeneralBug in the code PinmemberEmiliano9-Jun-05 13:17 
GeneralAnother small extension: drag all nodes Pinmemberamlinger28-Dec-04 22:23 
Generalsmall extension PinsussAnonymous22-Apr-04 0:27 
GeneralNot necessary to store the node-to-delete Pinmemberpplppp3-Feb-04 13:33 
GeneralNeed drag & drop examples using the CTrl button PinmemberSaradhi17-Dec-03 20:31 
GeneralRe: Need drag & drop examples using the CTrl button Pinmemberpplppp3-Feb-04 13:30 
GeneralOn drop scrolling PinmemberGarmeister23-Sep-03 11:51 
GeneralNot Completely Obvious PinmemberJohnAndre25-Aug-03 6:44 
GeneralRe: Not Completely Obvious PinmemberSaradhi17-Dec-03 20:30 
Generalyay. Pinmemberlangdonx20-Jul-03 5:51 
QuestionUmmm am I missing something? PinmemberRay Cassick5-Jun-03 12:38 
AnswerRe: Ummm am I missing something? PinmemberItsAWonderfulLife5-Jun-03 18:13 

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