public void SetLayeredWindowAttributes(byte?alpha, Color?colorKey = null)
{
LWA flags = 0;
byte bAlpha = 0;
uint crKey = 0;
if (alpha != null)
{
bAlpha = alpha.Value;
flags |= LWA.ALPHA;
}
if (colorKey != null)
{
uint r = (uint)colorKey.Value.R;
uint g = (uint)colorKey.Value.G;
uint b = (uint)colorKey.Value.B;
crKey = r + (g << 8) + (b << 16);
flags |= LWA.COLORKEY;
}
NativeMethods.SetLayeredWindowAttributes(_hwnd, crKey, bAlpha, flags);
}
public static BOOL SetLayeredWindowAttributes(IHandle hwnd, int crKey, byte bAlpha, LWA dwFlags)
{
BOOL result = SetLayeredWindowAttributes(hwnd.Handle, crKey, bAlpha, dwFlags);
GC.KeepAlive(hwnd);
return(result);
}
public static extern bool SetLayeredWindowAttributes(IntPtr hWnd, int crKey, byte alpha, LWA dwFlags);
public static extern bool SetLayeredWindowAttributes(IntPtr hWnd, int crKey, byte bAlpha, LWA dwFlags);
public static partial BOOL SetLayeredWindowAttributes(IntPtr hwnd, int crKey, byte bAlpha, LWA dwFlags);
internal static extern BOOL SetLayeredWindowAttributes(IntPtr hwnd, int crKey, byte bAlpha, LWA dwFlags);
public static extern bool SetLayeredWindowAttributes(HWND hwnd, uint crKey, byte bAlpha, LWA dwFlags);
public static extern bool SetLayeredWindowAttributes(HWND hwnd, uint crKey, byte bAlpha, LWA dwFlags);
public static extern bool SetLayeredWindowAttributes(IntPtr hwnd, COLORREF crKey, byte bAlpha, LWA dwFlags);
static extern Boolean SetLayeredWindowAttributes(IntPtr hWnd, int crKey, byte alpha, LWA dwFlags);
public static bool SetLayeredWindowAttributes(IntPtr hWnd, int crKey, int alpha, LWA dwFlags) => SetLayeredWindowAttributesNative(hWnd, crKey, alpha, dwFlags);
private static extern bool SetLayeredWindowAttributesNative(IntPtr hWnd, int crKey, int alpha, LWA dwFlags);
