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| import 'package:flutter/material.dart'; | |
| final Color darkBlue = Color.fromARGB(255, 18, 32, 47); | |
| void main() { | |
| runApp(MyApp()); | |
| } | |
| class MyAppBar extends StatefulWidget implements PreferredSizeWidget { | |
| final Color color; | |
| MyAppBar({this.color}) : preferredSize = Size.fromHeight(kToolbarHeight); | |
| @override | |
| final Size preferredSize; | |
| @override | |
| _MyAppBarState createState() => _MyAppBarState(); | |
| } | |
| class _MyAppBarState extends State<MyAppBar> with TickerProviderStateMixin { | |
| AnimationController controller; | |
| Color oldColor; | |
| @override | |
| void initState() { | |
| super.initState(); | |
| controller = AnimationController( | |
| vsync: this, duration: Duration(seconds: 1), value: 1); | |
| } | |
| @override | |
| void didUpdateWidget(MyAppBar oldWidget) { | |
| super.didUpdateWidget(oldWidget); | |
| oldColor = oldWidget.color; | |
| controller.forward(from: 0.0); | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return Container( | |
| color: oldColor, | |
| child: AnimatedBuilder( | |
| animation: controller, | |
| builder: (context, child) { | |
| return ClipOval( | |
| clipper: MyClipper(controller), | |
| child: child, | |
| ); | |
| }, | |
| child: Container( | |
| color: widget.color, | |
| width: MediaQuery.of(context).size.width, | |
| child: Center( | |
| child: Text('AppBar', style: TextStyle(color: Colors.white))), | |
| ), | |
| ), | |
| ); | |
| } | |
| @override | |
| void dispose() { | |
| controller.dispose(); | |
| super.dispose(); | |
| } | |
| } | |
| class MyClipper extends CustomClipper<Rect> { | |
| final Animation controller; | |
| MyClipper(this.controller); | |
| @override | |
| Rect getClip(Size size) { | |
| return Rect.fromCenter( | |
| center: Offset(size.width / 2, size.height / 2), | |
| height: size.width * controller.value, | |
| width: (size.width + 10) * controller.value); | |
| } | |
| @override | |
| bool shouldReclip(CustomClipper<Rect> oldClipper) => true; | |
| } | |
| class MyApp extends StatelessWidget { | |
| @override | |
| Widget build(BuildContext context) { | |
| return MaterialApp( | |
| theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue), | |
| debugShowCheckedModeBanner: false, | |
| home: Scaffold( | |
| body: Center( | |
| child: MyWidget(), | |
| ), | |
| ), | |
| ); | |
| } | |
| } | |
| class MyWidget extends StatefulWidget { | |
| @override | |
| _MyWidgetState createState() => _MyWidgetState(); | |
| } | |
| class _MyWidgetState extends State<MyWidget> { | |
| var colors = [ | |
| Colors.blue, | |
| Colors.green, | |
| Colors.red, | |
| Colors.amber, | |
| Colors.indigo | |
| ]; | |
| var index = 0; | |
| @override | |
| Widget build(BuildContext context) { | |
| return Scaffold( | |
| appBar: MyAppBar( | |
| color: colors[index], | |
| ), | |
| body: Center( | |
| child: RaisedButton( | |
| child: Text('Switch'), | |
| onPressed: () => | |
| setState(() => index = (index + 1) % colors.length)), | |
| ), | |
| ); | |
| } | |
| } |
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