【自学 Flutter】32 交错动画的使用，掌握这个提升路径,
St
aggerAnimation({ Key key, this.controller }): super(key: key){
height = Tween<double>(
begin:.0 ,
end: 300.0,
).animate(
CurvedAnimation(
parent: controller,
curve: Interval(
0.0, 0.6,
curve: Curves.ease,
),
),
);
color = ColorTween(
begin:Colors.green ,
end:Colors.red,
).animate(
CurvedAnimation(
parent: controller,
curve: Interval(
0.0, 0.6,
curve: Curves.ease,
),
),
);
padding = Tween<EdgeInsets>(
begin:EdgeInsets.only(left: 0.0),
end:EdgeInsets.only(left: 300),
).animate(
CurvedAnimation(
parent: controller,
curve: Interval(
0.6, 1.0,
curve: Curves.ease,
),
),
);
}
@override
Widget build(BuildContext context) {
return AnimatedBuilder(
builder: (context,child){
return Container(
alignment: Alignment.bottomLeft,
padding: padding.value ,
child: Container(
color: color.value,
width: 30.0,
height: height.value,
),
);
},
animation: controller,
);
}
}
2.解释源代码
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> with TickerProviderStateMixin {
AnimationController controller;
@override
void initState() {
super.initState();
controller = AnimationController(
duration: const Duration(milliseconds: 2000),
vsync: this
);
}
Future<Null> playAnimation() async {
//先正向执行动画
await controller.forward().orCancel;
//再反向执行动画
await controller.reverse().orCancel;
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: GestureDetector(
//自己处理事件
behavior: HitTestBehavior.opaque,
onTap: () {
//播放动画
playAnimation();
},
child: Center(
child: Container(
width: 300.0,
height: 300.0,
decoration: BoxDecoration(
color: Colors.black.withOpacity(0.1),
border: Border.all(
color: Colors.black.withOpacity(0.5),
),
),
//调用我们定义的交错动画 Widget
child: StaggerAnimation(
controller: controller
),
),
),
),
),
);
}
}
//定义交错动画 Widget
class StaggerAnimation extends StatelessWidget {
final Animation<double> controller;
Animation<double> height;
Animation<EdgeInsets> padding;
Animation<Color> color;
StaggerAnimation({ Key key, this.controller }): super(key: key){
//高度动画
height = Tween<double>(
begin:.0 ,
end: 300.0,
).animate(
CurvedAnimation(
parent: controller,
//间隔，前 60%的动画时间
curve: Interval(
0.0, 0.6,
curve: Curves.ease,
),
),
);
color = ColorTween(
begin:Colors.green ,
end:Colors.red,
).animate(
CurvedAnimation(
parent: controller,
//间隔，前 60%的动画时间
curve: Interval(
0.0, 0.6,
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