In .Net controls have a LostFocus event that fires when the control is no longer the active object; tabbing to next control or clicking somewhere else on the application. In Wolfram Language does EventHandler have a similar event?
The "MouseMoved" event cannot be used as this creates all manner of issues in a UI. Is there a hidden equivalent to .Net's LostFocus? If not can one be replicated without being dependent on the mouse events?
”MouseExited”but nothing to do with focus that I’ve seen. Try selection tracking though. I think that works. – b3m2a1 Feb 26 '18 at 20:30