直播源码网站,各式各样的淡入淡出动画
2022/1/3 17:13:07
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直播源码网站,各式各样的淡入淡出动画实现的相关代码
第一个
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; }); }, ), ), ); } }
第二个
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; }); }, ), ), ); } }
第三个
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: AnimatedContainer( width: _visible ? 200.0 : 100.0, height: _visible ? 100.0 : 200.0, color: _visible ? Colors.red : Colors.blue, duration: Duration(seconds: 2), curve: Curves.ease, child: Row( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Icon(Icons.ac_unit), Icon(Icons.ac_unit), Icon(Icons.ac_unit), ], ), ), ), ), floatingActionButton: FloatingActionButton( child: Icon(Icons.play_arrow), onPressed: () { setState(() { _visible = !_visible; }); }, ), ), ); } }
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