ExcelDna.IntelliSense.WindowWatcher.UpdateFocus C# (CSharp) Метод

        bool UpdateFocus(IntPtr windowHandle, string windowClassName)
        {
            if (windowHandle == _focusedWindowHandle)
            {
                Debug.Assert(_focusedWindowClassName == windowClassName);   // I've seen this, with _focusedWindowClassName == "" and windowClassName == "EXCEL7".
                return false;
            }

            Debug.Assert(_focusedWindowClassName != _excelToolTipClass); // We don't expect the ToolTip to ever get the focus
            Logger.WindowWatcher.Verbose($"Focus lost by {_focusedWindowHandle} ({_focusedWindowClassName})");
            // It has changed - raise an event for the old window
            switch (_focusedWindowClassName)
            {
                case _popupListClass:
                    PopupListWindowChanged?.Invoke(this, new WindowChangedEventArgs(_focusedWindowHandle, WindowChangedEventArgs.ChangeType.Unfocus));
                    break;
                case _inCellEditClass:
                    InCellEditWindowChanged?.Invoke(this, new WindowChangedEventArgs(_focusedWindowHandle, WindowChangedEventArgs.ChangeType.Unfocus));
                    break;
                case _formulaBarClass:
                    FormulaBarWindowChanged?.Invoke(this, new WindowChangedEventArgs(_focusedWindowHandle, WindowChangedEventArgs.ChangeType.Unfocus));
                    break;
                //case _nuiDialogClass:
                default:
                    // Not one of our watched window, so we don't care
                    break;
            }

            // Set the new focus info
            // Event will be raised by WinEventReceived handler itself
            _focusedWindowHandle = windowHandle;
            _focusedWindowClassName = windowClassName;
            Logger.WindowWatcher.Verbose($"Focus changed to {windowHandle} ({windowClassName})");
            return true;
        }