vb 请教如何使窗体上的标签会随着鼠标的拖拽移动位置

Question

这是原来的代码可以使标签移动

Private px As Single, py As Single
Private MD As Boolean

Private Sub Label1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)

px = X
py = Y

MD = True

End Sub

Private Sub Label1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)

If MD = True Then

Label1.Move Label1.Left + (X - px), Label1.Top + (Y - py)

End If

End Sub

Private Sub Label1_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
MD = False
End Sub

我现在想把标签限制在 （X > 2520 And X < 4560 And Y < 3840 And Y > 1320）这样的范围内，就是如果拖动超过了这个范围则无效，只能让标签在这个范围内拖动！
不行呀，一楼的试了没有哦！

Answer 1

'前提是Label1已经在这个范围里面了,不然得死拽了
Private Sub Label1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
If MD = True Then
a = Label1.Left + (X - px)
b = Label1.Top + (Y - py)
If a > 2520 And a < 4560 And b < 3840 And b > 1320 Then
Label1.Move a, b
End If
End If
End Sub

Answer 2

换成这样

Private Sub Label1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)

If MD = True and X > 2520 And X < 4560 And Y < 3840 And Y > 1320 Then

Label1.Move Label1.Left + (X - px), Label1.Top + (Y - py)

End If