ImplicitAnimations
sample.packages.flutter.lib.src.widgets.implicit_animations.580.
The following example (depicted above) transitions an AnimatedContainer
between two states. It adjusts the height
, width
, color
, and
[alignment] properties when tapped.
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 MyStatefulWidget(),
),
);
}
}
class MyStatefulWidget extends StatefulWidget {
const MyStatefulWidget({Key? key}) : super(key: key);
@override
State createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State {
bool selected = false;
@override
Widget build(BuildContext context) {
return GestureDetector(
onTap: () {
setState(() {
selected = !selected;
});
},
child: Center(
child: AnimatedContainer(
width: selected ? 200.0 : 100.0,
height: selected ? 100.0 : 200.0,
color: selected ? Colors.red : Colors.blue,
alignment:
selected ? Alignment.center : AlignmentDirectional.topCenter,
duration: const Duration(seconds: 2),
curve: Curves.fastOutSlowIn,
child: const FlutterLogo(size: 75),
),
),
);
}
}
SHARE: