标签：opacity 1.0 淡入淡出 0.0 visible child AnimatedOpacity 源代码 图片
直播系统源代码，用户在点击图片时，通过淡入淡出的方式放大图片的两种方法
第一种
class AnimatedContainerApp extends StatefulWidget {
@override
_AnimatedContainerAppState createState() => _AnimatedContainerAppState();
}
class _AnimatedContainerAppState extends State<AnimatedContainerApp> {
bool _visible = true;
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Center(
child: AnimatedOpacity(
//opacity=0.0透明
//opacity=1.0完全显示
opacity: _visible ? 1.0 : 0.0,
duration: Duration(milliseconds: 500),
// The green box must be a child of the AnimatedOpacity widget.
child: Container(
width: 200.0,
height: 200.0,
color: Colors.blue,
),
),
),
floatingActionButton: FloatingActionButton(
child: Icon(Icons.play_arrow),
onPressed: () {
setState(() {
_visible = !_visible;
});
},
),
),
);
}
}
第二种
lass AnimatedContainerApp extends StatefulWidget {
@override
_AnimatedContainerAppState createState() => _AnimatedContainerAppState();
}
class _AnimatedContainerAppState extends State<AnimatedContainerApp> {
bool _visible = true;
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Center(
child: Stack(
children: <Widget>[
AnimatedOpacity(
opacity: _visible ? 1.0 : 0.0,
duration: Duration(milliseconds: 3000),
// The green box must be a child of the AnimatedOpacity widget.
child: Container(
width: 350.0,
height: 350.0,
color: Colors.blue.withOpacity(0.2),
child: Text('1'),
alignment: Alignment.bottomRight,
),
curve: Curves.linear,
),
AnimatedOpacity(
opacity: _visible ? 1.0 : 0.0,
duration: Duration(milliseconds: 2500),
// The green box must be a child of the AnimatedOpacity widget.
child: Container(
width: 300.0,
height: 300.0,
color: Colors.blue.withOpacity(0.3),
child: Text('2'),
alignment: Alignment.bottomRight,
),
curve: Curves.linear,
),
AnimatedOpacity(
opacity: _visible ? 1.0 : 0.0,
duration: Duration(milliseconds: 2500),
// The green box must be a child of the AnimatedOpacity widget.
child: Container(
width: 250.0,
height: 250.0,
color: Colors.blue.withOpacity(0.4),
child: Text('3'),
alignment: Alignment.bottomRight,
),
curve: Curves.linear,
),
AnimatedOpacity(
opacity: _visible ? 1.0 : 0.0,
duration: Duration(milliseconds: 2000),
// The green box must be a child of the AnimatedOpacity widget.
child: Container(
width: 200.0,
height: 200.0,
color: Colors.blue.withOpacity(0.5),
child: Text('4'),
alignment: Alignment.bottomRight,
),
curve: Curves.linear,
),
AnimatedOpacity(
opacity: _visible ? 1.0 : 0.0,
duration: Duration(milliseconds: 1500),
// The green box must be a child of the AnimatedOpacity widget.
child: Container(
width: 150.0,
height: 150.0,
color: Colors.blue.withOpacity(0.6),
alignment: Alignment.bottomRight,
child: Text('5'),
),
curve: Curves.linear,
),
AnimatedOpacity(
opacity: _visible ? 1.0 : 0.0,
duration: Duration(milliseconds: 1000),
// The green box must be a child of the AnimatedOpacity widget.
child: Container(
width: 100.0,
height: 100.0,
color: Colors.blue.withOpacity(0.64),
alignment: Alignment.bottomRight,
child: Text('6'),
),
curve: Curves.linear,
),
AnimatedOpacity(
opacity: _visible ? 1.0 : 0.0,
duration: Duration(milliseconds: 500),
// The green box must be a child of the AnimatedOpacity widget.
child: Container(
width: 50.0,
height: 50.0,
alignment: Alignment.bottomRight,
color: Colors.blue.withOpacity(0.98),
child: Text('7'),
),
curve: Curves.linear,
),
],
),
),
floatingActionButton: FloatingActionButton(
child: Icon(Icons.play_arrow),
onPressed: () {
setState(() {
_visible = !_visible;
});
},
),
),
);
}
}
以上就是直播系统源代码，用户在点击图片时，通过淡入淡出的方式放大图片的两种方法， 更多内容欢迎关注之后的文章
标签：opacity,1.0,淡入淡出,0.0,visible,child,AnimatedOpacity,源代码,图片 来源： https://www.cnblogs.com/yunbaomengnan/p/15867754.html
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