vb.net FlowLayoutPanel 触摸屏滚动

Question

通过实现以下代码，我在使用触摸屏时设法在 FlowLayoutPanel 上实现某种形式的滚动...

Dim mouseDownPoint As Point
Private Sub FlowLayoutPanelUsers_MouseDown(ByVal sender As Object, ByVal e As MouseEventArgs) Handles FlowLayoutPanelUsers.MouseDown
    If (e.Button = MouseButtons.Left) Then
        Me.mouseDownPoint = e.Location
    End If

End Sub

Private Sub FlowLayoutPanelUsers_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs) Handles FlowLayoutPanelUsers.MouseMove
    If (e.Button <> MouseButtons.Left) Then
        Return
    End If

    If ((mouseDownPoint.X = e.Location.X) _
                AndAlso (mouseDownPoint.Y = e.Location.Y)) Then
        Return
    End If

    Dim currAutoS As Point = FlowLayoutPanelUsers.AutoScrollPosition
    If (mouseDownPoint.Y > e.Location.Y) Then
        'finger slide UP
        If (currAutoS.Y <> 0) Then
            currAutoS.Y = (Math.Abs(currAutoS.Y) - 1)
        End If

    ElseIf (mouseDownPoint.Y < e.Location.Y) Then
        'finger slide down
        currAutoS.Y = (Math.Abs(currAutoS.Y) + 1)
    Else
        currAutoS.Y = Math.Abs(currAutoS.Y)
    End If

    If (mouseDownPoint.X > e.Location.X) Then
        'finger slide left
        If (currAutoS.X <> 0) Then
            currAutoS.X = (Math.Abs(currAutoS.X) - 1)
        End If

    ElseIf (mouseDownPoint.X < e.Location.X) Then
        'finger slide right
        currAutoS.X = (Math.Abs(currAutoS.X) + 1)
    Else
        currAutoS.X = Math.Abs(currAutoS.X)
    End If

    FlowLayoutPanelUsers.AutoScrollPosition = currAutoS
    mouseDownPoint = e.Location
    'IMPORTANT
End Sub

这是我已经在 stackoverflow 上找到的一些代码，非常感谢您！

如果可能的话，我希望这段代码做的是反转它的滚动方式，所以如果我向左滚动，FlowLayoutPanel 向右滚动，如果我向上滚动，面板向下滚动，有点像网络浏览器。

有人对此有任何见解吗？我尝试了将减号反转为加号的简单方法，反之亦然，但没有效果。

提前致谢。

Answer 1

修改后的代码...

Dim mouseDownPoint As Point
Private Sub FlowLayoutPanelUsers_MouseDown(ByVal sender As Object, ByVal e As MouseEventArgs) Handles FlowLayoutPanelUsers.MouseDown
   If (e.Button = MouseButtons.Left) Then
       Me.mouseDownPoint = FlowLayoutPanelUsers.PointToClient(MousePosition)
   End If

End Sub

Private Sub FlowLayoutPanelUsers_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs) Handles FlowLayoutPanelUsers.MouseMove
   If (e.Button <> MouseButtons.Left) Then
       Return
   End If

   If ((mouseDownPoint.X = FlowLayoutPanelUsers.PointToClient(MousePosition).X) _
               AndAlso (mouseDownPoint.Y = FlowLayoutPanelUsers.PointToClient(MousePosition).Y)) Then
       Return
   End If

   Dim currAutoS As Point = FlowLayoutPanelUsers.AutoScrollPosition
   If (mouseDownPoint.Y > FlowLayoutPanelUsers.PointToClient(MousePosition).Y) Then
       'finger slide UP
       If (currAutoS.Y <> 0) Then
           currAutoS.Y = (Math.Abs(currAutoS.Y) - 1)
       End If

   ElseIf (mouseDownPoint.Y < FlowLayoutPanelUsers.PointToClient(MousePosition).Y) Then
       'finger slide down
       currAutoS.Y = (Math.Abs(currAutoS.Y) + 1)
   Else
       currAutoS.Y = Math.Abs(currAutoS.Y)
   End If

   If (mouseDownPoint.X > FlowLayoutPanelUsers.PointToClient(MousePosition).X) Then
       'finger slide left
       If (currAutoS.X <> 0) Then
           currAutoS.X = (Math.Abs(currAutoS.X) - 1)
       End If

   ElseIf (mouseDownPoint.X < FlowLayoutPanelUsers.PointToClient(MousePosition).X) Then
       'finger slide right
       currAutoS.X = (Math.Abs(currAutoS.X) + 1)
   Else
       currAutoS.X = Math.Abs(currAutoS.X)
   End If

   FlowLayoutPanelUsers.AutoScrollPosition = currAutoS
   mouseDownPoint = FlowLayoutPanelUsers.PointToClient(MousePosition)
   'IMPORTANT
End Sub