Transitions
sample.packages.flutter.lib.src.widgets.transitions.576.
Creates a [CustomScrollView] with a [SliverFixedExtentList] that uses a [SliverFadeTransition] to fade the list in and out.
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: 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({Key? key}) : super(key: key);
@override
State createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State
with SingleTickerProviderStateMixin {
late final AnimationController controller = AnimationController(
duration: const Duration(milliseconds: 1000),
vsync: this,
);
late final Animation 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: [
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,
),
),
),
]);
}
}
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