SidebarDiagnostics.Windows.AppBarWindow.AppBarHook C# (CSharp) Method

        private IntPtr AppBarHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            if (msg == _callbackID)
            {
                switch (wParam.ToInt32())
                {
                    case APPBARNOTIFY.ABN_POSCHANGED:
                        if (_cancelReposition != null)
                        {
                            _cancelReposition.Cancel();
                        }

                        _cancelReposition = new CancellationTokenSource();

                        Task.Delay(TimeSpan.FromMilliseconds(100), _cancelReposition.Token).ContinueWith(_ =>
                        {
                            if (_.IsCanceled)
                            {
                                return;
                            }

                            Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Action)(() =>
                            {
                                int _screen;
                                DockEdge _edge;
                                WorkArea _windowWA;
                                WorkArea _appbarWA;

                                Monitor.GetWorkArea(this, out _screen, out _edge, out _windowWA, out _appbarWA);

                                SetAppBar(_screen, _edge, _windowWA, _appbarWA, null);
                            }));

                            _cancelReposition = null;
                        });
                        break;

                    case APPBARNOTIFY.ABN_FULLSCREENAPP:
                        if (lParam.ToInt32() == 1)
                        {
                            _wasTopMost = IsTopMost;

                            if (IsTopMost)
                            {
                                SetBottom(false);
                            }
                        }
                        else if (_wasTopMost)
                        {
                            SetTopMost(false);
                        }
                        break;
                }

                handled = true;
            }

            return IntPtr.Zero;
        }