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标题: 网际快车的什么拖放栏的那个东东用VB怎么做? [打印本页]

作者: 初学者 时间: 2005-7-19 23:45 标题: 网际快车的什么拖放栏的那个东东用VB怎么做?

半透明的用在最前,又单击可以拖拽,是怎么做的?
还有种类似的"窗体" 可以隔着它点击比如那个窗体是在桌面上,右键点击窗体,就是再右击桌面,好多桌面时钟呀~ 天气预报~什么都那样,这是怎么做的?

作者: Nothing 时间: 2005-7-19 23:46

Private  Declare  Function  SetLayeredWindowAttributes  Lib  "user32"  (ByVal  hwnd  As  Long,  ByVal  crKey  As  Long,  ByVal  bAlpha  As  Byte,  ByVal  dwFlags  As  Long)  As  Long

Const  LWA_ALPHA  =  &H2    '：表示把窗体设置成半透明样式
Const  LWA_COLORKEY  =  &H1    '：表示不显示窗体中的透明色
Private  Const  WS_EX_LAYERED  =  &H80000
Private  Const  GWL_EXSTYLE  =  (-20)

Private  Declare  Function  GetWindowLong  Lib  "user32"  Alias  "GetWindowLongA"  (ByVal  hwnd  As  Long,  ByVal  nIndex  As  Long)  As  Long
Private  Declare  Function  SetWindowLong  Lib  "user32"  Alias  "SetWindowLongA"  (ByVal  hwnd  As  Long,  ByVal  nIndex  As  Long,  ByVal  dwNewLong  As  Long)  As  Long

Private  Sub  Form_Load()
            Static  I  As  Long
            Dim  rtn  As  Long

            I  =  128

            rtn  =  GetWindowLong(Me.hwnd,  GWL_EXSTYLE)       '：取的窗口原先的样式
            rtn  =  rtn  Or  WS_EX_LAYERED       '：使窗体添加上新的样式WS_EX_LAYERED
            SetWindowLong  Me.hwnd,  GWL_EXSTYLE,  rtn       '：把新的样式赋给窗体
            SetLayeredWindowAttributes  Me.hwnd,  0,  I,  LWA_ALPHA
            '把窗体设置成半透明样式  ,  第二个参数表示透明程度
            '取值范围0  --255,  为0时就是一个全透明的窗体了
            Me.Show
End  Sub

---------------------------------------------------------------

Private  Declare  Function  GetWindowLong  Lib  "user32"  Alias  _
"GetWindowLongA"  (ByVal  hwnd  As  Long,  ByVal  nIndex  As  Long)  As  Long
Private  Declare  Function  SetWindowLong  Lib  "user32"  Alias  _
"SetWindowLongA"  (ByVal  hwnd  As  Long,  ByVal  nIndex  As  Long,  _
ByVal  dwNewLong  As  Long)  As  Long
Private  Declare  Function  SetLayeredWindowAttributes  Lib  "user32"  _
(ByVal  hwnd  As  Long,  ByVal  crKey  As  Long,  ByVal  bAlpha  As  Byte,  _
ByVal  dwFlags  As  Long)  As  Long

Private  Const  GWL_EXSTYLE  =  (-20)
Private  Const  WS_EX_LAYERED  =  &H80000
Private  Const  WS_EX_TRANSPARENT  =  &H20&
Private  Const  LWA_ALPHA  =  &H2&

Option  Explicit
//还有种类似的"窗体"  可以隔着它点击比如那个窗体是在桌面上,右键点击窗体,就是再右击桌面,好多桌面时钟呀~  天气预报~什么都那样,这是怎么做的?

请参考MSDN关于WS_EX_TRANSPARENT扩展样式的示例：
http://support.microsoft.com/default.aspx?scid=kb;en-us;249341

'  ---  代码  ---

Private  Sub  Form_Load()
   Dim  lOldStyle  As  Long
   Dim  bTrans  As  Byte  '  The  level  of  transparency  (0  -  255)

   bTrans  =  128
   lOldStyle  =  GetWindowLong(Me.hWnd,  GWL_EXSTYLE)
   SetWindowLong  Me.hwnd,  GWL_EXSTYLE,  lOldStyle  Or  WS_EX_LAYERED  Or  WS_EX_TRANSPARENT
   SetLayeredWindowAttributes  Me.hWnd,  0,  bTrans,  LWA_ALPHA
End  Sub

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