شرح استخدام ويدجت DecoratedBoxTransition في فلاتر

DecoratedBoxTransition(
  decoration: _decoration,
  child: Container(
    width: 200,
    height: 200,
  ),
)

DecoratedBoxTransition(
  decoration: _decoration,
  duration: Duration(seconds: 1),
  position: DecorationPosition.background,
  child: Container(
    width: 200,
    height: 200,
  ),
)

DecoratedBoxTransition(
  decoration: _decoration,
  duration: Duration(seconds: 1),
  child: Container(
    width: 200,
    height: 200,
  ),
)

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'DecoratedBoxTransition Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyDecoratedBoxTransition(),
    );
  }
}

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

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

class _MyDecoratedBoxTransitionState extends State<MyDecoratedBoxTransition>
    with TickerProviderStateMixin {
  late AnimationController _controller;
  late Animation<Decoration> _animation;

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

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

    _animation = DecorationTween(
      begin: BoxDecoration(
        color: Colors.blue,
        borderRadius: BorderRadius.circular(20),
      ),
      end: BoxDecoration(
        color: Colors.red,
        borderRadius: BorderRadius.circular(100),
      ),
    ).animate(_controller);

    _controller.repeat(reverse: true);
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'DecoratedBoxTransition Demo',
      home: Scaffold(
        appBar: AppBar(
          title: const Text('DecoratedBoxTransition Demo'),
        ),
        body: Center(
          child: DecoratedBoxTransition(
            decoration: _animation,
            position: DecorationPosition.background,
            child: Container(
              width: 200,
              height: 200,
            ),
          ),
        ),
      ),
    );
  }

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