Flutter DecoratedBoxTransition Example

If you want to animate decoration property of a widget, you can use DecoratedBoxTransition. It is the animated version of DecoratedBox widget.

Besides using AnimatedContainer to animate a Container’s property, we can also use DecoratedBoxTransition.

import 'package:flutter/material.dart';

class Homepage extends StatefulWidget {
  const Homepage({Key? key}) : super(key: key);

  @override
  _HomepageState createState() => _HomepageState();
}

class _HomepageState extends State<Homepage> with SingleTickerProviderStateMixin{
  bool _play = false;

  final DecorationTween decorationTween = DecorationTween(
    begin: BoxDecoration(
      color: Colors.green,
      border: Border.all(style: BorderStyle.none),
      borderRadius: BorderRadius.circular(16.0),
      shape: BoxShape.rectangle,
      boxShadow: const <BoxShadow>[
        BoxShadow(
          color: Colors.lightGreen,
          blurRadius: 8.0,
          spreadRadius: 2.0,
          offset: Offset(0, 4.0),
        )
      ],
    ),
    end: BoxDecoration(
      color: Colors.blue,
      border: Border.all(
        style: BorderStyle.none,
      ),
      borderRadius: BorderRadius.zero,
      // No shadow.
    ),
  );

  late final AnimationController _controller = AnimationController(
    vsync: this,
    duration: const Duration(seconds: 2),
  );



  @override
  Widget build(BuildContext context) {

    return Scaffold(
      body: Center(
        child: Container(
          color: Colors.white,
          child: DecoratedBoxTransition(
            position: DecorationPosition.background,
            decoration: decorationTween.animate(_controller),
            child: Container(
              width: 250,
              height: 250,
              padding: const EdgeInsets.all(10),
              child: const FlutterLogo(),
            ),
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          setState(() {
            _play = !_play;
          });
          if(_controller.status == AnimationStatus.completed){
            _controller.reverse();
          } else{
            _controller.forward();
          }
        },
        backgroundColor: Colors.green,
        child: _play ? Icon(Icons.refresh) : Icon(Icons.play_arrow),
      ),
    );
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

}

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