private static extern void DwmEnableBlurBehindWindow(IntPtr hWnd, ref BLURBEHIND pBlurBehind);
public static void EnableBlurBehind(this Window window, bool enable, IntPtr region, bool transition)
{
var blurBehind = new BLURBEHIND
{
Flags = (BlurBehindOptions.Enable | BlurBehindOptions.TransitionOnMaximized),
Enable = enable,
TransitionOnMaximized = transition
};
if (enable && IntPtr.Zero != region)
{
blurBehind.Flags |= BlurBehindOptions.BlurRegion;
blurBehind.RegionBlur = region;
}
DwmEnableBlurBehindWindow(new WindowInteropHelper(window).Handle, ref blurBehind);
}