VB.Net Tutorial/GUI/ListBox Drag Drop

Drag and drop ListBox

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class ListBoxDragDrop

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class

Public Class Form1

   Private dragBounds As Rectangle
   Private dragMethod As String
   Private Sub ListBox1_DragEnter(ByVal sender As Object, _
         ByVal e As System.Windows.Forms.DragEventArgs) _
         Handles ListBox1.DragEnter
       " ----- Yes, we accept the items.
       If (e.Data.GetDataPresent(ListBox2.SelectedItems. _
             GetType()) = True) Then _
          e.Effect = DragDropEffects.Move
   End Sub
   Private Sub ListBox1_DragDrop(ByVal sender As Object, _
         ByVal e As System.Windows.Forms.DragEventArgs) _
         Handles ListBox1.DragDrop
       " ----- Accept the dropped items.
       For Each oneItem As Object In _
             e.Data.GetData(ListBox2.SelectedItems.GetType())
           ListBox1.Items.Add(oneItem)
       Next oneItem
   End Sub
   Private Sub ListBox1_MouseDown(ByVal sender As Object, _
         ByVal e As System.Windows.Forms.MouseEventArgs) _
         Handles ListBox1.MouseDown, ListBox2.MouseDown
       " ----- Prepare the draggable content.
       If (CType(sender, ListBox).SelectedItems.Count = 0) Then Return
       " ----- Don"t start the drag yet. Wait until we move a
       "       certain amount.
       dragBounds = New Rectangle(New Point(e.X - _
          (SystemInformation.DragSize.Width / 2), _
          e.Y - (SystemInformation.DragSize.Height / 2)), _
          SystemInformation.DragSize)
       If (sender Is ListBox1) Then
           dragMethod = "1to2"
       Else
           dragMethod = "2to1"
       End If
   End Sub
   Private Sub ListBox1_MouseMove(ByVal sender As Object, _
         ByVal e As System.Windows.Forms.MouseEventArgs) _
         Handles ListBox1.MouseMove
       " ----- Ignore if not dragging from ListBox1.
       If (dragMethod <> "1to2") Then Return
       " ----- Have we left the drag boundary?
       If (dragBounds.Contains(e.X, e.Y) = False) Then
           " ----- Start the drag-and-drop operation.
           If (ListBox1.DoDragDrop(ListBox1.SelectedItems, _
                 DragDropEffects.Move) = _
                 DragDropEffects.Move) Then
               " ----- Successful move. Remove the items from
               "       this list.
               Do While ListBox1.SelectedItems.Count > 0
                   ListBox1.Items.Remove(ListBox1.SelectedItems(0))
               Loop
           End If
           dragMethod = ""
       End If
   End Sub
   Private Sub ListBox1_MouseUp(ByVal sender As Object, _
         ByVal e As System.Windows.Forms.MouseEventArgs) _
         Handles ListBox1.MouseUp, ListBox2.MouseUp
       " ----- End of drag-and-drop.
       dragMethod = ""
   End Sub
   Private Sub ListBox2_DragEnter(ByVal sender As Object, _
         ByVal e As System.Windows.Forms.DragEventArgs) _
         Handles ListBox2.DragEnter
       " ----- Yes, we accept the items.
       If (e.Data.GetDataPresent(ListBox1.SelectedItems. _
          GetType()) = True) Then _
          e.Effect = DragDropEffects.Move
   End Sub
   Private Sub ListBox2_DragDrop(ByVal sender As Object, _
         ByVal e As System.Windows.Forms.DragEventArgs) _
         Handles ListBox2.DragDrop
       " ----- Accept the dropped items.
       For Each oneItem As Object In _
             e.Data.GetData(ListBox1.SelectedItems.GetType())
           ListBox2.Items.Add(oneItem)
       Next oneItem
   End Sub
   Private Sub ListBox2_MouseMove(ByVal sender As Object, _
         ByVal e As System.Windows.Forms.MouseEventArgs) _
         Handles ListBox2.MouseMove
       " ----- Ignore if not dragging from ListBox2.
       If (dragMethod <> "2to1") Then Return
       " ----- Have we left the drag boundary?
       If (dragBounds.Contains(e.X, e.Y) = False) Then
           " ----- Start the drag-and-drop operation.
           If (ListBox2.DoDragDrop(ListBox2.SelectedItems, _
                 DragDropEffects.Move) = _
                 DragDropEffects.Move) Then
               " ----- Successful move. Remove the items from
               "       this list.
               Do While ListBox2.SelectedItems.Count > 0
                   ListBox2.Items.Remove(ListBox2.SelectedItems(0))
               Loop
           End If
           dragMethod = ""
       End If
   End Sub

End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _ Partial Class Form1

   Inherits System.Windows.Forms.Form
   "Form overrides dispose to clean up the component list.
   <System.Diagnostics.DebuggerNonUserCode()> _
   Protected Overrides Sub Dispose(ByVal disposing As Boolean)
       If disposing AndAlso components IsNot Nothing Then
           components.Dispose()
       End If
       MyBase.Dispose(disposing)
   End Sub
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.IContainer
   "NOTE: The following procedure is required by the Windows Form Designer
   "It can be modified using the Windows Form Designer.  
   "Do not modify it using the code editor.
   <System.Diagnostics.DebuggerStepThrough()> _
   Private Sub InitializeComponent()
       Me.ListBox1 = New System.Windows.Forms.ListBox
       Me.ListBox2 = New System.Windows.Forms.ListBox
       Me.SuspendLayout()
       "
       "ListBox1
       "
       Me.ListBox1.AllowDrop = True
       Me.ListBox1.FormattingEnabled = True
       Me.ListBox1.Items.AddRange(New Object() {"One", "Two", "Three", "Four", "Five", "Six"})
       Me.ListBox1.Location = New System.Drawing.Point(8, 8)
       Me.ListBox1.Name = "ListBox1"
       Me.ListBox1.SelectionMode = System.Windows.Forms.SelectionMode.MultiExtended
       Me.ListBox1.Size = New System.Drawing.Size(192, 95)
       Me.ListBox1.TabIndex = 0
       "
       "ListBox2
       "
       Me.ListBox2.AllowDrop = True
       Me.ListBox2.FormattingEnabled = True
       Me.ListBox2.Location = New System.Drawing.Point(208, 8)
       Me.ListBox2.Name = "ListBox2"
       Me.ListBox2.SelectionMode = System.Windows.Forms.SelectionMode.MultiExtended
       Me.ListBox2.Size = New System.Drawing.Size(192, 95)
       Me.ListBox2.TabIndex = 1
       "
       "Form1
       "
       Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
       Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
       Me.ClientSize = New System.Drawing.Size(408, 112)
       Me.Controls.Add(Me.ListBox2)
       Me.Controls.Add(Me.ListBox1)
       Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
       Me.MaximizeBox = False
       Me.Name = "Form1"
       Me.Text = "ListBox Drag-and-Drop"
       Me.ResumeLayout(False)
   End Sub
   Friend WithEvents ListBox1 As System.Windows.Forms.ListBox
   Friend WithEvents ListBox2 As System.Windows.Forms.ListBox

End Class</source>

Drag file from File Explore to ListBox

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class FileDragDrop

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class Public Class Form1

   Private Sub ListBox1_DragEnter(ByVal sender As Object, _
         ByVal e As System.Windows.Forms.DragEventArgs) _
         Handles ListBox1.DragEnter
       If (e.Data.GetDataPresent(DataFormats.FileDrop) =True) Then
           e.Effect = DragDropEffects.Copy
       End If
   End Sub
   Private Sub ListBox1_DragDrop(ByVal sender As Object, _
         ByVal e As System.Windows.Forms.DragEventArgs) _
         Handles ListBox1.DragDrop
       For Each oneFile As String In _
             e.Data.GetData(DataFormats.FileDrop)
           ListBox1.Items.Add(oneFile)
       Next oneFile
   End Sub

End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _ Partial Class Form1

   Inherits System.Windows.Forms.Form
   "Form overrides dispose to clean up the component list.
   <System.Diagnostics.DebuggerNonUserCode()> _
   Protected Overrides Sub Dispose(ByVal disposing As Boolean)
       If disposing AndAlso components IsNot Nothing Then
           components.Dispose()
       End If
       MyBase.Dispose(disposing)
   End Sub
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.IContainer
   "NOTE: The following procedure is required by the Windows Form Designer
   "It can be modified using the Windows Form Designer.  
   "Do not modify it using the code editor.
   <System.Diagnostics.DebuggerStepThrough()> _
   Private Sub InitializeComponent()
       Me.ListBox1 = New System.Windows.Forms.ListBox
       Me.SuspendLayout()
       "
       "ListBox1
       "
       Me.ListBox1.AllowDrop = True
       Me.ListBox1.FormattingEnabled = True
       Me.ListBox1.Location = New System.Drawing.Point(8, 8)
       Me.ListBox1.Name = "ListBox1"
       Me.ListBox1.Size = New System.Drawing.Size(576, 238)
       Me.ListBox1.TabIndex = 0
       "
       "Form1
       "
       Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
       Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
       Me.ClientSize = New System.Drawing.Size(594, 256)
       Me.Controls.Add(Me.ListBox1)
       Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
       Me.MaximizeBox = False
       Me.Name = "Form1"
       Me.Text = "Drag and Drop Files"
       Me.ResumeLayout(False)
   End Sub
   Friend WithEvents ListBox1 As System.Windows.Forms.ListBox

End Class</source>