controller property

AnimationController controller

Returns the main AnimationController instance for this state class.

Example: (using supercharged)

class _MyAnimatedWidgetState extends State<MyAnimatedWidget>
    with AnimationMixin {  // Add AnimationMixin to state class

  Animation<double> size; // Declare animation variable

  @override
  void initState() {
    size = 0.0.tweenTo(200.0).animatedBy(controller); // Connect tween and controller and apply to animation variable
    controller.play(); // Start the animation playback
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
        width: size.value, // Use animation variable's value here
        height: size.value, // Use animation variable's value here
        color: Colors.red
    );
  }
}

Implementation

AnimationController get controller {
  _mainControllerInstance ??= _newAnimationController();
  return _mainControllerInstance!;
}