Solved

VB.net Drag and Drop and Mouse Move

Posted on 2008-10-22
4
888 Views
Last Modified: 2010-04-21
Hi in the event  "lsvAction_DragDrop" I need to change the line that the user drags to using the following event. The problem is that it doesn't work all the time. I need to get the exact index before the DragDrop is initiated
Private Sub lsvAction_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles lsvAction.MouseMove

        Dim LocalMousePosition As Point
        LocalMousePosition = Me.lsvAction.PointToClient(Cursor.Position)

        Dim x As Integer = LocalMousePosition.X
        Dim y As Integer = LocalMousePosition.Y

        Dim HoveredItem As ListViewItem = Me.lsvAction.GetItemAt(x, y)
        If HoveredItem Is Nothing Then Return

        ListIndex_on_Mousehover = HoveredItem.Index

    End Sub
0
Comment
Question by:Murray Brown
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 10

Expert Comment

by:kdwood
ID: 22781287
Why not use the MouseDown event.  That way you know for sure what the index of the item is that they clicked on to drag.  For example I have an application where I'm dragging items between two ListBoxes.  I approach it as follows:

1. On the ListBox MouseDown Event:

                If Me.YourListBoxDraggedFrom.SelectedIndex <> -1 Then
                    Dim dragData As String = Me.YourListBox.SelectedItem
                    Me.YourListBox.DoDragDrop(dragData, DragDropEffects.Copy)
                End If

2. On the ListBox DragLeaveEvent:

     e.Effect = DragDropEffects.Copy

3. On the Listbox DragDropEvent

     Me.YourListboxDraggedTo.Items.Add(e.Data.GetData(GetType(String)))

Let me know if this helps.

Regards,

Keith

0
 
LVL 10

Accepted Solution

by:
kdwood earned 250 total points
ID: 22781306
oops typo.... section 1 should read:

1. On the ListBox MouseDown Event:

                If Me.YourListBoxDraggedFrom.SelectedIndex <> -1 Then
                    Dim dragData As String = Me.YourListBox.SelectedItem
                    Me.YourListBoxDraggedFrom.DoDragDrop(dragData, DragDropEffects.Copy)
                End If
0
 
LVL 86

Assisted Solution

by:Mike Tomlinson
Mike Tomlinson earned 250 total points
ID: 22781473
You should get multiple DragOver() events before the final DragDrop() event.

Try:
    Private Sub lsvAction_DragOver(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles lsvAction.DragOver        
        Dim HoveredItem As ListViewItem = Me.lsvAction.GetItemAt(e.X, e.Y)
        If Not IsNothing(HoveredItem) Then
            ListIndex_on_Mousehover = HoveredItem.Index
        End If
    End Sub

Open in new window

0
 

Author Closing Comment

by:Murray Brown
ID: 31508934
thanks
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I think the Typed DataTable and Typed DataSet are very good options when working with data, but I don't like auto-generated code. First, I create an Abstract Class for my DataTables Common Code.  This class Inherits from DataTable. Also, it can …
If you need to start windows update installation remotely or as a scheduled task you will find this very helpful.
If you're a developer or IT admin, you’re probably tasked with managing multiple websites, servers, applications, and levels of security on a daily basis. While this can be extremely time consuming, it can also be frustrating when systems aren't wor…
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …

688 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question