cross_fade 0.3.0 cross_fade: ^0.3.0 copied to clipboard
A widget to apply a crossfade animation between different states and/or widgets.
import 'dart:async';
import 'package:cross_fade/cross_fade.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return const MaterialApp(
title: 'CrossFade Example',
home: MyHomePage(title: 'CrossFade Example Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final List _objects = const [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
final List<Widget> _icons = const [
Icon(
Icons.cancel,
size: 150.0,
),
Icon(
Icons.check_circle,
size: 150.0,
),
Icon(
Icons.camera_rounded,
size: 150.0,
),
];
final List<Widget> _widgets = [
Container(
color: Colors.blue,
width: 150.0,
height: 150.0,
child: const Center(child: Text('Any widget')),
),
Container(
color: Colors.red,
height: 100.0,
width: 200,
child: const Center(child: Text('Any other widget')),
),
Container(
color: Colors.green,
height: 50.0,
width: 300.0,
child: const Center(child: Text('Any other other widget')),
),
];
int _index = 0;
late final Timer _timer;
@override
void initState() {
super.initState();
_timer = Timer.periodic(
const Duration(milliseconds: 1500), (t) => setState(() => _index++));
}
@override
void dispose() {
_timer.cancel();
super.dispose();
}
@override
Widget build(BuildContext context) {
final theme = Theme.of(context);
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Center(
child: Container(
color: Colors.red,
child: CrossFade(
value: _objects[_index % _objects.length],
builder: (context, i) => Text(
'$i',
style: theme.textTheme.headline1,
textAlign: TextAlign.center,
),
),
),
),
Center(
child: CrossFade(
value: _objects[_index % _objects.length],
builder: (context, i) => Text(
'$i',
style: theme.textTheme.headline1,
textAlign: TextAlign.center,
),
),
),
Center(
child: DecoratedBox(
position: DecorationPosition.foreground,
decoration: BoxDecoration(border: Border.all(width: 3.0)),
child: CrossFade<int>(
value: _index,
builder: (context, i) => _widgets[i % _widgets.length],
),
),
),
Center(
child: CrossFade<int>(
value: _index,
builder: (context, i) => _icons[i % _icons.length],
),
),
Center(
child: CrossFade(
value: _objects[_index % _objects.length],
builder: (context, i) => Text(
'$i',
style: theme.textTheme.headline1,
textAlign: TextAlign.center,
),
highlightTransition: (o1, o2) => true,
),
),
],
),
);
}
}