Drag and Drop problem

[oxbow123]

I try to drag items from a listview to a Treeview.

I use the following code but I don't know how to do the folowing points :

1 - Check if data dragged onto the treeview is listview item collection

2 - When dragdrop, retrieving data from the listview item collection dropped

Thanks in advance ;-)

here is my code :

Private Sub ListView1_ItemDrag(ByVal sender As Object, ByVal e As System.Windows.Forms.ItemDragEventArgs) Handles ListView1.ItemDrag
        ListView1.DoDragDrop(ListView1.SelectedItems, DragDropEffects.Copy Or DragDropEffects.Move)
 
    End Sub
 
 
    Private Sub TreeView1_DragOver(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles TreeView1.DragOver
        Dim Pt As Point
        Dim Node As TreeNode
 
        'If Not (TypeOf sender Is ListView.SelectedListViewItemCollection) Then Exit Sub
        'If e.Data.GetDataPresent(GetType(System.Windows.Forms.ListView.ListViewItemCollection)) = True Then
        Pt = TreeView1.PointToClient(New Point(e.X, e.Y))
        Node = TreeView1.GetNodeAt(Pt)
        If Microsoft.VisualBasic.Left(Node.Tag, 7) = "AGENT  " Then
            e.Effect = DragDropEffects.Move
        Else
            e.Effect = DragDropEffects.None
        End If
        'End If
    End Sub
 
    Private Sub TreeView1_DragDrop(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles TreeView1.DragDrop
        Dim Result As DialogResult
        'popup confirmation du move
        Result = MsgBox("Etes vous sure de vouloir transférer les dossier ?", MsgBoxStyle.YesNo, "Transfer dossier")
        If Result = DialogResult.No Then Exit Sub
        'update agent traitant des dossiers concerné par le nouvel agent
        Dim Items As ListView.ListViewItemCollection()
        Items = CType(e.Data.GetData(GetType(System.Windows.Forms.ListView.ListViewItemCollection)), ListView.ListViewItemCollection())
        'refresh treeview
    End Sub

[Edneeis]

1 - Check if data dragged onto the treeview is listview item collection

If e.Data.GetDataPresent(GetType(System.Windows.Forms.ListView.ListViewItemCollection)) Then

Although you are passing the SelectedItems into the DragDrop so you should really be checking for the SelectedListViewItemCollection:

If e.Data.GetDataPresent(GetType(ListView.SelectedListViewItemCollection)) Then
'other code here
End If

2 - When dragdrop, retrieving data from the listview item collection dropped

Use the e.Data.GetData to get the SelectedListViewItemCollection in the DragDrop event.

If e.Data.GetDataPresent(GetType(ListView.SelectedListViewItemCollection)) Then
Dim scol As ListView.SelectedListViewItemCollection=CType(e.Data.GetData,ListView.SelectedListViewItemCollection)
'rest of code here
End If

[oxbow123]

Great it works !!!!


thanks a lot