再谈用VB无窗口透明Usercontrol编写透明浮动按钮

    去年曾写过一篇博文，名称叫《用VB无窗口透明Usercontrol编写透明浮动按钮》，该文有一个观点是错误的，即透明无窗口Usercontrol不支持设计时点选。其实，通过在UserControl_HitTest过程里加入HitResult = vbHitResultHit语句，就可以实现设计时的点选了，为此，修改代码如下：
'* ************************************************************** *
'* 程序名称：Button.ctl
'* 程序功能：透明浮动按扭
'* 作者：lyserver
'* 联系方式：http://blog.csdn.net/lyserver
'* 说明：解决了FloatButton版本设计时不能点选的BUG
'* ************************************************************** *
Option Explicit
'======================================================================
' API 声明
'======================================================================
Private Type POINTAPI
x As Long
y As Long
End Type
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private Declare Function SetRect Lib "user32" (lpRect As RECT, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function OffsetRect Lib "user32" (lpRect As RECT, ByVal x As Long, ByVal y As Long) As Long
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Private Declare Function ScreenToClient Lib "user32" (ByVal hwnd As Long, lpPoint As POINTAPI) As Long
Private Declare Function DrawEdge Lib "user32" (ByVal hdc As Long, qrc As RECT, ByVal edge As Long, ByVal grfFlags As Long) As Long
Private Const BDR_RAISED = &H5
Private Const BDR_SUNKEN = &HA
Private Const BDR_RAISEDINNER = &H4
Private Const BDR_SUNKENINNER = &H8
Private Const BDR_RAISEDOUTER = &H1
Private Const BDR_SUNKENOUTER = &H2
Private Const BF_RECT = &HF
Private Declare Function DrawText Lib "user32" Alias "DrawTextA" (ByVal hdc As Long, ByVal lpStr As String, ByVal nCount As Long, lpRect As RECT, ByVal wFormat As Long) As Long
Private Const DT_CENTER = &H1
Private