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Nodes order after Drag&Drop

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This is a migrated thread and some comments may be shown as answers.
Thomas
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Thomas asked on 08 Oct 2014, 08:30 AM
Hi,

I have trouble with node dragging. It can be reproduced in your demo "Demo Application - Telerik UI for WinForms Q2 2014 SP1". Select "Tree View" -> "Drag & Drop". I am using left tree.
1. Click on the node "Drafts";
2. Press shift button and click on the "Outbox" node;
3. Release shift button;
4. Press left mouse button on the "Outbox" node and start dragging;
5. Drop selected nodes after node "Large Mail".

You can see that order of nodes was changed.
Before: "Drafts", "Inbox" and "Outbox"
After: "Outbox", "Drafts" and "Inbox"

How I can change this behavior?

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Dess | Tech Support Engineer, Principal
Telerik team
answered on 13 Oct 2014, 06:57 AM
Hello Thomas,

Thank you for writing.

I confirm that the selected nodes order is incorrect when performing the described steps. I have logged it in our feedback portal. You can track its progress, subscribe for status changes and add your vote/comment to it on the following link - feedback item.

I have also updated your Telerik points.

Currently, the possible solution that I can suggest is to perform manually the selection in the desired order. Here is a sample implementation:
RadTreeNode startNode = null;
RadTreeNode endNode = null;
List<RadTreeNode> selectedNodes;
bool performSelection = false;
bool reverse = false;
 
private void radTreeView1_SelectedNodeChanging(object sender, RadTreeViewCancelEventArgs e)
{
    if (Control.ModifierKeys == Keys.Shift &&
        e.TreeView.SelectedNodes.Count == 1 &&
        e.Node != e.TreeView.SelectedNodes.First())
    {
        endNode = e.Node;
        startNode = e.TreeView.SelectedNodes.First();
    }
}
 
private void radTreeView1_SelectedNodeChanged(object sender, RadTreeViewEventArgs e)
{
    if (e.TreeView.SelectedNodes.Count >= 2 &&
        e.TreeView.SelectedNodes.First() == endNode &&
        e.TreeView.SelectedNodes[1] == startNode &&
        !performSelection)
    {
        performSelection = true;
        reverse = false;
        selectedNodes = new List<RadTreeNode>();
      
        for (int i = 1; i < e.TreeView.SelectedNodes.Count; i++)
        {
            selectedNodes.Add(e.TreeView.SelectedNodes[i]);
        }
        if (startNode.Level > 0 && startNode.Level == endNode.Level)
        {
            if (startNode.Parent == endNode.Parent)
            {
                if (startNode.Parent.Nodes.IndexOf(startNode.Text) > startNode.Parent.Nodes.IndexOf(endNode.Text))
                {
                    reverse = true;
                    selectedNodes.Reverse();
                }
            }
        }
        else if (e.TreeView.Nodes.IndexOf(startNode.Text) > e.TreeView.Nodes.IndexOf(endNode.Text))
        {
            reverse = true;
            selectedNodes.Reverse();
        }
        
        e.TreeView.SelectedNodes.Clear();
        if (reverse)
        {
            if (endNode.Parent != null)
            {
                e.TreeView.Nodes[endNode.Parent.Text].Nodes[endNode.Text].Selected = true;
            }
            else
            {
                e.TreeView.Nodes[endNode.Text].Selected = true;
            }
        }
        foreach (RadTreeNode n in selectedNodes)
        {
            n.Selected = true;
        }
        if (!reverse)
        {
            if (endNode.Parent != null)
            {
                e.TreeView.Nodes[endNode.Parent.Text].Nodes[endNode.Text].Selected = true;
            }
            else
            {
                e.TreeView.Nodes[endNode.Text].Selected = true;
            }
        }
         
        performSelection = false;
    }
}

I hope this information helps. Should you have further questions, I would be glad to help.
 
Regards,
Desislava
Telerik
 

Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.

 
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Asked by
Thomas
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Answers by
Dess | Tech Support Engineer, Principal
Telerik team
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