| 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 | |