Windows Blurring.cs

  #region Blur Handling
        /*
        Found on https://github.com/riverar/sample-win10-aeroglass
        */
        private enum AccentState
        {
            ACCENT_DISABLED = 0,
            ACCENT_ENABLE_GRADIENT = 1,
            ACCENT_ENABLE_TRANSPARENTGRADIENT = 2,
            ACCENT_ENABLE_BLURBEHIND = 3,
            ACCENT_INVALID_STATE = 4
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct AccentPolicy
        {
            public AccentState AccentState;
            public int AccentFlags;
            public int GradientColor;
            public int AnimationId;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct WindowCompositionAttributeData
        {
            public WindowCompositionAttribute Attribute;
            public IntPtr Data;
            public int SizeOfData;
        }

        private enum WindowCompositionAttribute
        {
            WCA_ACCENT_POLICY = 19
        }
        [DllImport("user32.dll")]
        private static extern int SetWindowCompositionAttribute(IntPtr hwnd, ref WindowCompositionAttributeData data);

        /// <summary>
        /// Sets the blur for a window via SetWindowCompositionAttribute
        /// </summary>
        /// <param name="wind">window to blur</param>
        /// <param name="isBlur">true/false - on or off correspondingly</param>
        private void SetBlurForWindow(Window wind, bool isBlur)
        {
            if (isBlur)
            {
                SetWindowAccent(wind, AccentState.ACCENT_ENABLE_BLURBEHIND);
            }
        }

        private void SetWindowAccent(Window wind, AccentState themeAccentMode)
        {
            var windowHelper = new WindowInteropHelper(wind);
            var accent = new AccentPolicy { AccentState = themeAccentMode };
            var accentStructSize = Marshal.SizeOf(accent);

            var accentPtr = Marshal.AllocHGlobal(accentStructSize);
            Marshal.StructureToPtr(accent, accentPtr, false);

            var data = new WindowCompositionAttributeData
            {
                Attribute = WindowCompositionAttribute.WCA_ACCENT_POLICY,
                SizeOfData = accentStructSize,
                Data = accentPtr
            };

            SetWindowCompositionAttribute(windowHelper.Handle, ref data);

            Marshal.FreeHGlobal(accentPtr);
        }
        #endregion
    }