| Imports System |
| Imports System.Drawing |
| Imports System.Collections |
| Imports System.Windows.Forms |
|
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| Namespace Controls |
|
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| Public Class ListViewEx |
|
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| Inherits ListView |
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| Private Const REORDER As String = "Reorder" |
|
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| Private _allowRowReorder As Boolean = True |
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| 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 |
|
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| 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 |
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|
| For Each removeItem As ListViewItem In MyBase.SelectedItems |
| MyBase.Items.Remove(removeItem) |
| Next |
| End Sub |
|
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| 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 |
|
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| 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 |
|
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| Protected Overrides Sub OnDragEnter(ByVal e As DragEventArgs) |
| MyBase.OnDragEnter(e) |
| If Not Me.AllowRowReorder Then |
| e.Effect = DragDropEffects.None |
| Return |
| End If |
|
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| If Not e.Data.GetDataPresent(DataFormats.Text) Then |
| e.Effect = DragDropEffects.None |
| Return |
| End If |
|
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| 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 |
|
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| Protected Overrides Sub OnItemDrag(ByVal e As ItemDragEventArgs) |
| MyBase.OnItemDrag(e) |
| If Not Me.AllowRowReorder Then |
| Return |
| End If |
|
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| MyBase.DoDragDrop(REORDER, DragDropEffects.Move) |
| End Sub |
| End Class |
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| End Namespace |
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