ListView ToolTip闪烁

Question

我有一个具有特定id值的ListView。我使用movemove方法在工具提示中显示有关此id的其他详细信息。

代码是用VB2003编写的，到目前为止，它工作得很好。最近我们迁移到了VB2008。

现在，工具提示闪烁。详情见下文。

希望这对.NET的大个子们来说是一个简单的问题。我是一名Java开发人员，所以我几乎(没有)知道我做错了什么。

编译器设置:目标框架.NET 2.0

代码：

Dim m_HoveredItem As ListViewItem

Private Sub cancellationList_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs) Handles CancellationList.MouseMove
    Dim lvi As ListViewItem = Me.CancellationList.GetItemAt(e.X, e.Y)

    If Not lvi Is m_HoveredItem Then
        m_HoveredItem = lvi
        If lvi Is Nothing Then
            Me.cancelrejectToolTip.SetToolTip(Me.CancellationList, "")
        Else
            Dim orderText As String() = lvi.Text.Split("(")
            Dim orderRef As Integer = CInt(orderText(0).Trim)
            Dim orderIsin As String
            Dim orderDesc As String
            Dim order As AppOrder= New AppOrder(_server, orderRef)
            orderIsin = order.Isin
            orderDesc = order.OrderDescription
            cancelrejectToolTip.SetToolTip(Me.CancellationList, (orderRef.ToString & "/" & orderIsin & "/" & orderDesc))
        End If
    End If
End Sub

Answer 1

看起来鼠标移动一直在可见的工具提示上移动，使其隐藏，但随后鼠标移动使其再次可见，循环继续。最简单的方法是使用Show方法仅偏移工具提示的位置：

Private Sub cancellationList_MouseMove(ByVal sender As Object, _
                                       ByVal e As MouseEventArgs) _
                                       Handles CancellationList.MouseMove
  Dim lvi As ListViewItem = Me.CancellationList.GetItemAt(e.X, e.Y)

  If Not lvi Is m_HoveredItem Then
    m_HoveredItem = lvi
    If lvi Is Nothing Then
      Me.cancelrejectToolTip.Hide(Me.CancelleationList) 
    Else
      Dim orderText As String() = lvi.Text.Split("(")
      Dim orderRef As Integer = CInt(orderText(0).Trim)
      Dim orderIsin As String
      Dim orderDesc As String
      Dim order As AppOrder= New AppOrder(_server, orderRef)
      orderIsin = order.Isin
      orderDesc = order.OrderDescription

      cancelrejectToolTip.Show(orderRef.ToString & "/" & orderIsin & "/" & orderDesc, _
                               Me.Cancellationlist, _
                               New Point(e.X + 16, e.Y + 16))
    End If
  End If
End Sub