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Imports System
Imports System.Drawing
Imports System.Collections
Imports System.Windows.Forms
Namespace Controls
Public Class ListViewEx
Inherits ListView
Private Const REORDER As String = "Reorder"
Private _allowRowReorder As Boolean = True
Public Property AllowRowReorder As Boolean
Get
Return Me._allowRowReorder
End Get
Set
Me._allowRowReorder = Value
MyBase.AllowDrop = Value
End Set
End Property
Public Shadows Property Sorting As SortOrder
Get
Return SortOrder.None
End Get
Set
MyBase.Sorting = SortOrder.None
End Set
End Property
Public Sub New()
MyBase.New
Me.AllowRowReorder = True
End Sub
Protected Overrides Sub OnDragDrop(ByVal e As DragEventArgs)
MyBase.OnDragDrop(e)
If Not Me.AllowRowReorder Then
Return
End If
If (MyBase.SelectedItems.Count = 0) Then
Return
End If
Dim cp As Point = MyBase.PointToClient(New Point(e.X, e.Y))
Dim dragToItem As ListViewItem = MyBase.GetItemAt(cp.X, cp.Y)
If (dragToItem Is Nothing) Then
Return
End If
Dim dropIndex As Integer = dragToItem.Index
If (dropIndex > MyBase.SelectedItems(0).Index) Then
dropIndex = (dropIndex + 1)
End If
Dim insertItems As ArrayList = New ArrayList(MyBase.SelectedItems.Count)
For Each item As ListViewItem In MyBase.SelectedItems
insertItems.Add(item.Clone)
Next
Dim i As Integer = (insertItems.Count - 1)
Do While (i >= 0)
Dim insertItem As ListViewItem = CType(insertItems(i), ListViewItem)
MyBase.Items.Insert(dropIndex, insertItem)
i = (i - 1)
Loop
For Each removeItem As ListViewItem In MyBase.SelectedItems
MyBase.Items.Remove(removeItem)
Next
End Sub
Protected Overrides Sub OnDragOver(ByVal e As DragEventArgs)
If Not Me.AllowRowReorder Then
e.Effect = DragDropEffects.None
Return
End If
If Not e.Data.GetDataPresent(DataFormats.Text) Then
e.Effect = DragDropEffects.None
Return
End If
Dim cp As Point = MyBase.PointToClient(New Point(e.X, e.Y))
Dim hoverItem As ListViewItem = MyBase.GetItemAt(cp.X, cp.Y)
If (hoverItem Is Nothing) Then
e.Effect = DragDropEffects.None
Return
End If
For Each moveItem As ListViewItem In MyBase.SelectedItems
If (moveItem.Index = hoverItem.Index) Then
e.Effect = DragDropEffects.None
hoverItem.EnsureVisible()
Return
End If
Next
MyBase.OnDragOver(e)
Dim text As String = CType(e.Data.GetData(REORDER.GetType), String)
If (text.CompareTo(REORDER) = 0) Then
e.Effect = DragDropEffects.Move
hoverItem.EnsureVisible()
Else
e.Effect = DragDropEffects.None
End If
End Sub
Protected Overrides Sub OnDragEnter(ByVal e As DragEventArgs)
MyBase.OnDragEnter(e)
If Not Me.AllowRowReorder Then
e.Effect = DragDropEffects.None
Return
End If
If Not e.Data.GetDataPresent(DataFormats.Text) Then
e.Effect = DragDropEffects.None
Return
End If
MyBase.OnDragEnter(e)
Dim text As String = CType(e.Data.GetData(REORDER.GetType), String)
If (text.CompareTo(REORDER) = 0) Then
e.Effect = DragDropEffects.Move
Else
e.Effect = DragDropEffects.None
End If
End Sub
Protected Overrides Sub OnItemDrag(ByVal e As ItemDragEventArgs)
MyBase.OnItemDrag(e)
If Not Me.AllowRowReorder Then
Return
End If
MyBase.DoDragDrop(REORDER, DragDropEffects.Move)
End Sub
End Class
End Namespace
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