The AnimationChain class is used to animate multiple Animatables. Those Animatables are animated one after the other and the onComplete callback is called when the last Animatable has completed.

See also: Juggler, AnimationChain, Animatable

Examples:

var ac = new AnimationChain();
ac.add(new Tween(sprite, 2.0, TransitionFunction.easeOutBounce)..animate.x.to(700));
ac.add(new Tween(sprite, 2.0, TransitionFunction.linear)..animate.y.to(500));
ac.delay = 1.0;
ac.onStart = () => print("start");
ac.onComplete = () => print("complete");
juggler.add(ac);

juggler.addChain([
    new Tween(sprite, 2.0, TransitionFunction.easeOutBounce)..animate.x.to(700),
    new Tween(sprite, 2.0, TransitionFunction.linear)..animate.y.to(500)])
    ..onComplete = () => print("complete");

class AnimationChain implements Animatable {

 final List<Animatable> _animatables = new List<Animatable>();

 Function _onStart;
 Function _onComplete;

 num _time = 0.0;
 num _delay = 0.0;
 bool _started = false;
 bool _completed = false;

 //-------------------------------------------------------------------------------------------------

 void add(Animatable animatable) {
   _animatables.add(animatable);
 }

 bool advanceTime(num time) {

   _time += time;

   if (_started == false) {
     if (_time > _delay) {
       _started = true;
       if (_onStart != null) _onStart();
     } else {
       return true;
     }
   }

   if (_animatables.length > 0) {
     if (_animatables[0].advanceTime(time) == false) {
       _animatables.removeAt(0);
     }
   }

   if (_animatables.length == 0) {
     _completed = true;
     if (_onComplete != null) _onComplete();
     return false;
   } else {
     return true;
   }
 }

 //-------------------------------------------------------------------------------------------------

 num get delay => _delay;
 bool get isComplete => _completed;

 set delay(num value) {
   if (_started == false) {
     _time = _time + _delay - value;
     _delay = value;
   }
 }

 //-------------------------------------------------------------------------------------------------

 /* The function that is called when a [AnimationChain] starts.
  * This happens after the specified delay.
  */
 void set onStart(void function()) { _onStart = function; }

 /* The function that is called when a [AnimationChain] is completed.
  */
 void set onComplete(void function()) { _onComplete = function; }
}