CLASSE JOUANT AVEC LA TRANSPARENCE ENTRE 2 CONTROLES ET UN DEGRADER POUR FAIRE DES MENU OU DES BOUTONS

'Extrait : Fonction principale

Private Function Fusion(vObj As Object)
 Dim BF As BLENDFUNCTION, lBF As Long
 Dim i As Long
       
    For i = 0 To vObj.ScaleWidth
        BF.SourceConstantAlpha = 255 - Int(255 / vObj.ScaleWidth * i)
        RtlMoveMemory lBF, BF, 4
        
        AlphaBlend vObj.hdc, i, 0, 1, vObj.ScaleHeight, vDCDegrader, 0, 0, 1, vObj.ScaleHeight, lBF
    Next i
End Function

Private Function Make_Degrader(vObj As Object, vColor1 As Long, vColor2 As Long) As Boolean
 Dim R As Byte, G As Byte, B As Byte
 
 Dim gRect      As GRADIENT_RECT
 Dim vVertex(1) As TRIVERTEX
 
    'BMP degrader
    vDCDegrader = CreateCompatibleDC(GetDC(0))
    vBMPDegrader = CreateCompatibleBitmap(GetDC(0), 1, vObj.ScaleHeight)
    Call SelectObject(vDCDegrader, vBMPDegrader)
 
    gRect.UpperLeft = 0
    gRect.LowerRight = 1
    
    Call GetRGB(vColor1, R, G, B)
                
    vVertex(0).X = 0
    vVertex(0).Y = 0
    vVertex(0).Red = "&H" & Hex(R / 16 * 256 * 16)
    vVertex(0).Green = "&H" & Hex(G / 16 * 256 * 16)
    vVertex(0).Blue = "&H" & Hex(B / 16 * 256 * 16)
    vVertex(0).Alpha = 0
                
    Call GetRGB(vColor2, R, G, B)
                
    vVertex(1).X = 1
    vVertex(1).Y = vObj.ScaleHeight
    vVertex(1).Red = "&H" & Hex(R / 16 * 256 * 16)
    vVertex(1).Green = "&H" & Hex(G / 16 * 256 * 16)
    vVertex(1).Blue = "&H" & Hex(B / 16 * 256 * 16)
    vVertex(1).Alpha = 0
    
    Make_Degrader = GradientFill(vDCDegrader, vVertex(0), 2, gRect, 1, GRADIENT_FILL_RECT_V)
    
    If vStyle = 1 Then
        Call SetPixel(vDCDegrader, 0, 0, vStyleColor)
        Call SetPixel(vDCDegrader, 0, vObj.ScaleHeight - 1, vStyleColor)
    End If
End Function