甲磺酸:请大家帮我详细解释一下啊 还有vb 从那里开始学起啊 谢谢了

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Option Explicit
Dim dragx As Single
Dim dragy As Single
Const BEGIN_DRAG = 1

Private Sub Form_DragDrop(Source As Control, X As Single, Y As Single)
Image1.Picture = Source
frmS4.Image1.Picture = LoadPicture("")
Image1.Move (X - dragx), (Y - dragy)
Image1.Visible = True
frmS4.Image1.Visible = False
End Sub

Private Sub Form_Load()
Load frmS4
frmS4.Show
End Sub

Private Sub Image1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
dragx = X
dragy = Y
Image1.Drag BEGIN_DRAG
End Sub