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Dicas
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Visual Basic (Forms/MDI)
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Título da Dica: Controle de opacidade do form
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Postada em 27/6/2007 por Alexandre
alexandre7937@bol.com.br
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 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 Const GWL_EXSTYLE = (-20)
Private Const LWA_ALPHA = &H2
Private Const WS_EX_LAYERED = &H80000
Public Function Is_Transparent(ByVal hWnd As Long) As Boolean
On Error Resume Next
Dim Msg As Long
Msg = GetWindowLong(hWnd, GWL_EXSTYLE)
If (Msg And WS_EX_LAYERED) = WS_EX_LAYERED Then
Is_Transparent = True
Else
Is_Transparent = False
End If
If Err Then
Is_Transparent = False
End If
End Function
Public Function Aplicar_Transparencia(ByVal hWnd As Long, _
Valor As Integer) As Long
Dim Msg As Long
On Error Resume Next
If Valor < 0 Or Valor > 255 Then
Aplicar_Transparencia = 1
Else
Msg = GetWindowLong(hWnd, GWL_EXSTYLE)
Msg = Msg Or WS_EX_LAYERED
SetWindowLong hWnd, GWL_EXSTYLE, Msg
SetLayeredWindowAttributes hWnd, 0, Valor, LWA_ALPHA
Aplicar_Transparencia = 0
End If
If Err Then
Aplicar_Transparencia = 2
End If
End Function
'------------------------------ATIVANDO--no-form--seu-controle--------------------------
Call Aplicar_Transparencia(Me.hWnd, CByte("VALOR_DE_50_A_255"))
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