控件的拖动和缩放技术全解

　　建立一个窗体，放置一个按钮，点击该按钮创建动态建立一个可以拖动和缩放的按钮。全部源码如下：

　　Public Class Form1

　　Inherits System.Windows.Forms.Form

　　Enum EnumMousePointPosition

　　MouseSizeNone = 0 '无

　　MouseSizeRight = 1 '拉伸右边框

　　MouseSizeLeft = 2 '拉伸左边框

　　MouseSizeBottom = 3 '拉伸下边框

　　MouseSizeTop = 4 '拉伸上边框

　　MouseSizeTopLeft = 5 '拉伸左上角

　　MouseSizeTopRight = 6 '拉伸右上角

　　MouseSizeBottomLeft = 7 '拉伸左下角

　　MouseSizeBottomRight = 8 '拉伸右下角

　　MouseDrag = 9 '鼠标拖动

　　End Enum

　　Dim m_MousePointPosition As EnumMousePointPosition

　　Dim p, p1 As Point

　　Private Sub MyMouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)

　　p = New Point(e.X, e.Y)   '记录光标开始拖动点

　　p1 = New Point(e.X, e.Y)

　　End Sub

　　Private Sub MyMouseLeave(ByVal sender As Object, ByVal e As System.EventArgs)

　　m_MousePointPosition = EnumMousePointPosition.MouseSizeNone

　　Me.Cursor = Cursors.Arrow

　　End Sub

　　Private Sub MyMouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)

　　If e.Button = MouseButtons.Left Then

　　Select Case m_MousePointPosition

　　Case EnumMousePointPosition.MouseDrag

　　sender.Location = New Point(sender.Left + e.X - p.X, sender.Top + e.Y - p.Y)

　　Case EnumMousePointPosition.MouseSizeBottom

　　sender.Size = New Size(sender.Width, sender.Height + e.Y - p1.Y)

　　p1 = New Point(e.X, e.Y)   '记录光标拖动的当前点

　　Case EnumMousePointPosition.MouseSizeBottomRight