https://learn.microsoft.com/zh-cn/dotnet/api/system.windows.iinputelement.previewstylusoutofrange?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
IInputElement.PreviewStylusOutOfRange Event (System.Windows) | Microsoft Learn
Occurs when the stylus is too far from the digitizer to be detected.
event systemwindowsmicrosoftlearn