/// Flutter code sample for AnimatedSize
// This example makes a [Container] react to being touched, causing the child
// of the [AnimatedSize] widget, here a [FlutterLogo], to animate.
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
/// This is the main application widget.
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(),
),
),
);
}
}
/// This is the stateful widget that the main application instantiates.
class MyStatefulWidget extends StatefulWidget {
const MyStatefulWidget({Key? key}) : super(key: key);
@override
_MyStatefulWidgetState createState() => _MyStatefulWidgetState();
}
/// This is the private State class that goes with MyStatefulWidget.
class _MyStatefulWidgetState extends State<MyStatefulWidget>
with SingleTickerProviderStateMixin {
double _size = 50.0;
bool _large = false;
void _updateSize() {
setState(() {
_size = _large ? 250.0 : 100.0;
_large = !_large;
});
}
@override
Widget build(BuildContext context) {
return GestureDetector(
onTap: () => _updateSize(),
child: Container(
color: Colors.amberAccent,
child: AnimatedSize(
curve: Curves.easeIn,
vsync: this,
duration: const Duration(seconds: 1),
child: FlutterLogo(size: _size),
),
),
);
}
}
Flutter动画和运动控件之图片的大小变化AnimatedSize
最新推荐文章于 2024-05-22 23:29:33 发布