blob: 5fac69653b27728a39b29d99d06bd389582dc999 [file] [log] [blame]
// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flutter code sample for SliverFadeTransition
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
static const String _title = 'Flutter Code Sample';
@override
Widget build(BuildContext context) {
return MaterialApp(
title: _title,
home: Scaffold(
appBar: AppBar(title: const Text(_title)),
body: const Center(
child: MyStatefulWidget(),
),
),
);
}
}
class MyStatefulWidget extends StatefulWidget {
const MyStatefulWidget({super.key});
@override
State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State<MyStatefulWidget>
with SingleTickerProviderStateMixin {
late final AnimationController controller = AnimationController(
duration: const Duration(milliseconds: 1000),
vsync: this,
);
late final Animation<double> animation = CurvedAnimation(
parent: controller,
curve: Curves.easeIn,
);
@override
void initState() {
super.initState();
animation.addStatusListener((AnimationStatus status) {
if (status == AnimationStatus.completed) {
controller.reverse();
} else if (status == AnimationStatus.dismissed) {
controller.forward();
}
});
controller.forward();
}
@override
void dispose() {
controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return CustomScrollView(slivers: <Widget>[
SliverFadeTransition(
opacity: animation,
sliver: SliverFixedExtentList(
itemExtent: 100.0,
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
return Container(
color: index.isEven ? Colors.indigo[200] : Colors.orange[200],
);
},
childCount: 5,
),
),
),
]);
}
}