Invoked when the application is asked to quit.
Implementors must call either
QuitResponse.cancelQuit()
,
QuitResponse.performQuit()
, or ensure the application terminates.
The process (or log-out) requesting this app to quit will be blocked until the
QuitResponse
is handled.
Apps that require complex UI to shutdown may call the
QuitResponse
from any thread.
Your app may be asked to quit multiple times before you have responded to the initial request.
This handler is called each time a quit is requested, and the same
QuitResponse
object is passed until it is handled.
Once used, the
QuitResponse
cannot be used again to change the decision.