public void Handle(TextEntered @event)
 {
     if (HasFocus)
     {
         var eventArgs = new TextEnterEventArgs();
         eventArgs.OldText = Text.DisplayedString;
         TextInput(@event);
         eventArgs.NewText = Text.DisplayedString;
         OnTextEnter(eventArgs);
     }
 }
 public void OnTextEnter(TextEnterEventArgs args) => TextEnter?.Invoke(this, args);