Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 747
  • Last Modified:

Example

Where can I find a good example of doing a drag drop from a datagrid to a treeview control. When I go to the DragDrop event of the treeveiw and try to get the node it always comes back as Nothing. Why is this? Here is the code.

 Private Sub tvMain_DragDrop(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles tvMain.DragDrop
        Dim n As Object = tvMain.GetNodeAt(e.X, e.Y)
        MsgBox(n.Text)
    End Sub

What am I doing wrong?
0
thenrich
Asked:
thenrich
1 Solution
 
navneet77Commented:
Can you put the code you use when you start the drag process.
0
 
thenrichAuthor Commented:
Private Sub C1TrueDBGrid1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles C1TrueDBGrid1.MouseDown
        If e.Button = MouseButtons.Right Then
            C1TrueDBGrid1.MoveRelative(0, C1TrueDBGrid1.RowContaining(e.Y))
        End If
        'Dim row, col As Integer
        'dragColumn = -1
        'If Me.C1TrueDBGrid1.CellContaining(e.X, e.Y, row, col) Then
        '    Me.C1TrueDBGrid1.MarqueeStyle = C1.Win.C1TrueDBGrid.MarqueeEnum.HighlightRow
        '    Me.C1TrueDBGrid1.Col = col
        '    Me.C1TrueDBGrid1.Bookmark = row
        '    dragColumn = col
        '    IsDrag = True
        'End If
        IsDrag = True
    End Sub
    Private Sub C1TrueDBGrid1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles C1TrueDBGrid1.MouseUp
        IsDrag = False
    End Sub

    Private Sub C1TrueDBGrid1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles C1TrueDBGrid1.MouseMove
        If dragColumn <> -1 And IsDrag Then
            Me.C1TrueDBGrid1.DoDragDrop("", DragDropEffects.Copy)
            IsDrag = False
        End If
    End Sub
0
 
MajinLokiCommented:
I have done drag and drop from a treeview to another form.
trvresults is my treeview.


Public Sub trvresults_ItemDrag(ByVal sender As Object, ByVal e As System.Windows.Forms.ItemDragEventArgs) Handles trvresults.ItemDrag
        Dim line As String
        Try
            If Not trvresults.SelectedNode.Parent Is Nothing Then
                line = trvresults.SelectedNode.Parent.Text & "        " & DirectCast(e.Item, System.Windows.Forms.TreeNode).Text
                DoDragDrop(line, Windows.Forms.DragDropEffects.Copy)
            End If
        Catch ex As Exception
            MsgBox("An error has occurred.")
            Report.reportError(ex)
        End Try
    End Sub

'***--- on the other page I have this

Private Sub Form1_DragEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles MyBase.DragEnter
        Try
            e.Effect = Windows.Forms.DragDropEffects.Copy
        Catch ex As Exception
            MsgBox("An error has occurred.")
            Report.reportError(ex)
        End Try
    End Sub

I know it's not exactly what you're looking for, but, maybe seeing it in reverse will help you get some ideas.  The trick I found was that when you start the drag drop on one side, it's easiest just to put all the data into a delimited string and then parse it out on the drop.  I really hope this helps you.

Majin Loki
0

Featured Post

Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now