kishan2612

 void _startAnimation(AnimationController _controller) {
    _controller.fling(
        velocity:isBackpanelVisible(widget._controller) ? -1.0 : 1.0);
  }
  
   bool isBackpanelVisible(AnimationController _controller) {
    final AnimationStatus status =_controller.status;
    return status == AnimationStatus.completed ||
        status == AnimationStatus.forward;
  }

kishan2612

 Widget _frontView() {
    return SlideTransition(
        position: _getSlideAnimation(),
        child: ScaleTransition(
          alignment: Alignment.centerLeft,
          scale: _getScaleAnimation(),
          child: _frontViewBody(),
        ));
  }

kishan2612

@override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: activityContainer,
    );
  }  

Widget activityContainer(BuildContext context, BoxConstraints constraint) {
    final ThemeData _theme = Theme.of(context);
    return Container(

kishan2612

/* 
FrontView Slide Animation 
*/

  Animation<Offset> _getSlideAnimation() {
    return Tween(begin: Offset(0.85, 0.0), end: Offset(0, 0)).animate(
        CurvedAnimation(parent: widget._controller, curve: Curves.linear));
  }

/*

kishan2612

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  AnimationController _controller;

  @override
  void initState() {
    super.initState();

    _controller = AnimationController(
        vsync: this, duration: const Duration(milliseconds: 100), value: 1.0);