An object containing the different Tween callback functions.
You can either set these in the Tween config, or by calling the Tween.setCallback method.
The types available are:
onActive - When the Tween is first created it moves to an 'active' state when added to the Tween Manager. 'Active' does not mean 'playing'.
onStart - When the Tween starts playing after a delayed or paused state. This will happen at the same time as onActive if the tween has no delay and isn't paused.
onLoop - When a Tween loops, if it has been set to do so. This happens after the loopDelay expires, if set.
onComplete - When the Tween finishes playback fully. Never invoked if the Tween is set to repeat infinitely.
onStop - Invoked only if the Tween.stop method is called.
onPause - Invoked only if the Tween.pause method is called. Not invoked if the Tween Manager is paused.
onResume - Invoked only if the Tween.resume method is called. Not invoked if the Tween Manager is resumed.
The following types are also available and are invoked on a TweenData level - that is per-object, per-property, being tweened.
onYoyo - When a TweenData starts a yoyo. This happens after the hold delay expires, if set.
onRepeat - When a TweenData repeats playback. This happens after the repeatDelay expires, if set.
onUpdate - When a TweenData updates a property on a source target during playback.