Drag and drop with Radtreeview nodes

[Sandip]

Hi;
    Am having RadGridView and RadTreeView. Am dragging & dropping items from the GridView to different the nodes of a Treeview. This is working fine. We have used "IsDragDropEnabled="True" in RadTreeView for performing task. In the same time am able to rearrange the nodes(performing drag & drop within different nodes of same RadTreeView). This i would like to stop. Please have a look on the attached image for your reference.

Thanx in advance.

--Sandy

[Tsvyatko]

Hi Sandip,

 You might want to check this help article - http://www.telerik.com/help/silverlight/radtreeview-how-to-disable-drop-specific-location.html.

All the best,
Tsvyatko
the Telerik team

[Jay]

Hi,

We had a requirement as follows:
An item can be moved around among its sibilings below the same parent only.

if (e.TargetDropItem != null  && draggedItems != null && draggedItems.Count > 0 )
            {
                Node targetNode = (Node)(e.TargetDropItem.Header);
                if (e.TargetDropItem.ParentItem != null && targetNode != draggedItems[0] as Node)
                {
                    if (e.DropPosition == DropPosition.After || e.DropPosition == DropPosition.Before)
                    {                       
                        if (targetNode.ParentNode != (draggedItems[0] as Node).ParentNode)
                        {
                            e.TargetDropItem.ParentItem.IsDropAllowed = false;
                        }
                        else
                        {
                            e.TargetDropItem.ParentItem.IsDropAllowed = true;
                        }
                    }
                    else if (e.DropPosition == DropPosition.Inside)
                    {
                        if (e.TargetDropItem == draggedItems[0] ||
                            targetNode != (draggedItems[0] as Node).ParentNode)
                        {
                            e.TargetDropItem.IsDropAllowed = false;                          
                        }
                        else
                        {
                            e.TargetDropItem.IsDropAllowed = true;
                        }
                    }
                    else
                    {
                        e.TargetDropItem.IsDropAllowed = false;
                    }
                }
                else
                {
                    e.TargetDropItem.IsDropAllowed = false;
                }
            }

The problem is that when we drag the last treeview item downwards, the e.dropitem is self but the visual indication is displayed below the root treeview item. On mouseup, the item is dropped as a sibiling to the root treeview item.

Please advice

Thanks
Jay

[Chetan]

Hi,

i want dragdropEnable = true for tree view. But dropping in other control not in tree view.

I have tried with
<telerik:RadTreeViewItem Header="Tennis" IsDropAllowed="False">

and work with node added at design time in Xaml.

but how could this achieve with tree source given with hirachical data source.

Then I have tried with

DragDrop.

 
DragDropManager.AddDropHandler(tvDeviceExplorerModel, AddressOf OnDropE, True)
'tvDeviceExplorerModel >> tree control name

Private Sub OnDropE(sender As Object, args As Telerik.Windows.DragDrop.DragEventArgs)
     DirectCast(sender, Telerik.Windows.Controls.RadTreeView).AllowDrop = False

End Sub

here instead of AllowDrop = False I want some event by which I can cancel the drop tree node within tree node.
Please help me on same.

Thanks in advance.

 

[Nick]

Hello Chetan,

You can handle the DragOver event and set the Effects to None if you don't want the drop to be enabled.

Hope this helps! 

Regards,
Nik
Telerik

[Chetan]

Thanks, for help.

That work for me as required.