Here is a simple example to study...
var myTimer:Timer = new Timer(300000);
myTimer.addEventListener(TimerEvent.TIMER, timerListener, false, 0, true);
stage.addEventListener(MouseEvent.MOUSE_MOVE, reset_Timer); //check for any mouse movement
myTimer.start();
function timerListener (e:TimerEvent) :void
{
//# function happens when Timer amount is reached (eg: mouse did not move to reset it)
//choose one below..
//fscommand("quit"); //# close app
//myTimer.stop(); myTimer.start(); //# stop and then restart Timer
//stage.removeEventListener(MouseEvent.MOUSE_MOVE, reset_Timer); //# cancel any further usage of this function
}
function reset_Timer (e:MouseEvent) :void
{
//# function happens after mouse not moved for total millisecond count of Timer amount
myTimer.reset(); //reset countdown because mouse was moved
}