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| import 'package:flutter/material.dart';
import 'package:gm_staff_module/demo/example/example_common.dart';
//简单动画
class GMExampleAnimationSimplePage extends StatefulWidget {
GMExampleAnimationSimplePage({Key key}) : super(key: key);
@override
_GMExampleAnimationSimplePageState createState() =>
_GMExampleAnimationSimplePageState();
}
class _GMExampleAnimationSimplePageState
extends State<GMExampleAnimationSimplePage> {
final GlobalKey<_AnimationDemo01State> demo01Key = GlobalKey();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: example_common_appBar(context, "简单动画"),
body: _buildContent(context),
floatingActionButton: FloatingActionButton(
child: Icon(Icons.play_circle_filled),
onPressed: () {
if (!this.demo01Key.currentState.controller.isAnimating) {
demo01Key.currentState.controller.forward();
} else {
demo01Key.currentState.controller.stop();
}
},
),
);
}
Widget _buildContent(ctx) {
return AnimationDemo01(
key: demo01Key,
);
}
}
class AnimationDemo01 extends StatefulWidget {
AnimationDemo01({Key key}) : super(key: key);
@override
_AnimationDemo01State createState() => _AnimationDemo01State();
}
class _AnimationDemo01State extends State<AnimationDemo01>
with SingleTickerProviderStateMixin {
AnimationController controller;
Animation<double> animation;
@override
void initState() {
super.initState();
//1.创建AnimationController
controller =
AnimationController(duration: Duration(seconds: 1), vsync: this);
//2.动画添加Curve效果
animation = CurvedAnimation(
parent: controller,
curve: Curves.elasticInOut,
reverseCurve: Curves.easeOut);
// //3.监听动画
// animation.addListener(() {
// print("addListener ...");
// setState(() {});
// });
//4.控制动画的翻转
animation.addStatusListener((status) {
print("addStatusListener -- $status");
if (status == AnimationStatus.completed) {
controller.reverse();
} else if (status == AnimationStatus.dismissed) {
controller.forward();
}
});
//5.设置值的范围
animation = Tween(begin: 50.0, end: 120.0).animate(controller);
}
@override
Widget build(BuildContext context) {
return Center(
child: AnimatedBuilder(
animation: animation,
builder: (ctx, child) {
return Icon(
Icons.favorite,
color: Colors.red,
size: animation.value,
);
},
// child: Container(),
),
);
}
@override
void dispose() {
controller.dispose();
super.dispose();
}
}
class IconAnimation extends AnimatedWidget {
IconAnimation(Animation animation) : super(listenable: animation);
@override
Widget build(BuildContext context) {
Animation animation = listenable;
print("IconAnimation -- ${animation.value}");
return Icon(
Icons.favorite,
color: Colors.red,
size: animation.value,
);
}
}
|
