New UWP working Notification class

[Hantick]

Hello, I've remixed a Notification.cs class to work with UWP projects, If you're interested I could push it to seperate branch.

using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;

namespace ClipboardTools
{
    /// <summary>
    /// Provides notifications when the contents of the clipboard is updated.
    /// From: https://stackoverflow.com/questions/621577/clipboard-event-c-sharp
    /// </summary>
    public sealed class UWPNotification
    {
        /// <summary>
        /// Occurs when the contents of the clipboard is updated.
        /// </summary>
        public static event EventHandler ClipboardUpdate;

        private static NotificationWindow _window;
        public UWPNotification(HwndSource source)
        {
            _window = new NotificationWindow(source);
        }

        /// <summary>
        /// Raises the <see cref="ClipboardUpdate"/> event.
        /// </summary>
        /// <param name="e">Event arguments for the event.</param>
        private static void OnClipboardUpdate(EventArgs e)
        {
            var handler = ClipboardUpdate;
            if (handler != null)
            {
                handler(null, e);
            }
        }

        /// <summary>
        /// Hidden window to recieve the WM_CLIPBOARDUPDATE message.
        /// It gets HwndSource from main window, necessary handler to make Notification class work.
        /// </summary>
        private partial class NotificationWindow : Window
        {
            public NotificationWindow(HwndSource source)
            {
                NativeMethods.AddClipboardFormatListener(source.Handle);
                source.AddHook(WndProc);
            }

            private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
            {
                if (msg == NativeMethods.WM_CLIPBOARDUPDATE)
                {
                    OnClipboardUpdate(null);
                }

                return IntPtr.Zero;
            }
        }
    }

    internal static class NativeMethods
    {
        // See http://msdn.microsoft.com/en-us/library/ms649021%28v=vs.85%29.aspx
        public const int WM_CLIPBOARDUPDATE = 0x031D;
        public static IntPtr HWND_MESSAGE = new IntPtr(-3);

        // See http://msdn.microsoft.com/en-us/library/ms632599%28VS.85%29.aspx#message_only
        [DllImport("user32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool AddClipboardFormatListener(IntPtr hwnd);

        // See http://msdn.microsoft.com/en-us/library/ms633541%28v=vs.85%29.aspx
        // See http://msdn.microsoft.com/en-us/library/ms649033%28VS.85%29.aspx
        [DllImport("user32.dll", SetLastError = true)]
        public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
    }

}