[Conditionally execute tween animations]

I'd like to have a fromTo TweenMax run a function prior to executing its animations to determine whether it should perform the animations or remain in its current state.

 

The tween will always execute once, but repeat/revert animations should be governed by a function.

 

I've tried playing around with onUpdate and .pause(), but am not having any luck.

 

My code is looking something like this:

 

onUpdateParams: ["{self}"],
onUpdate: function(tween) {
  if (some_condition) {
    tween.pause();
  } else {
    tween.play();
  }
}