非标题区域拖动窗体VB

Dim MoveScreen As Boolean
Dim MousX As Integer
Dim MousY As Integer
Dim CurrX As Integer
Dim CurrY As Integer

Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    If Button = 1 Then
        MoveScreen = True
        MousX = X
        MousY = Y
    End If
End Sub

Private Sub Form_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
    If MoveScreen Then
        CurrX = Form1.Left - MousX + X
        CurrY = Form1.Top - MousY + Y
        Form1.Move CurrX, CurrY
    End If
End Sub

Private Sub Form_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
    MoveScreen = False
End Sub