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| import 'dart:math';
import 'package:flutter/material.dart';
import 'package:gm_staff_module/demo/example/example_common.dart';
//交织动画
class GMExampleAnimationMixedPage extends StatefulWidget {
GMExampleAnimationMixedPage({Key key}) : super(key: key);
@override
_GMExampleAnimationMixedPageState createState() =>
_GMExampleAnimationMixedPageState();
}
class _GMExampleAnimationMixedPageState
extends State<GMExampleAnimationMixedPage> {
final GlobalKey<_AnimationDemo02State> demo02Key = GlobalKey();
@override
Widget build(BuildContext context) {
debugPrint("GMExampleAnimationMixedPage build ---- ");
return Scaffold(
appBar: example_common_appBar(context, "交织动画"),
body: _buildContent(context),
floatingActionButton: FloatingActionButton(
child: Icon(Icons.play_circle_filled),
onPressed: () {
if (!this.demo02Key.currentState.controller.isAnimating) {
demo02Key.currentState.controller.forward();
} else {
demo02Key.currentState.controller.stop();
}
},
),
);
}
Widget _buildContent(ctx) {
print("_buildContent ----------");
return AnimationDemo02(key: demo02Key);
}
}
class AnimationDemo02 extends StatefulWidget {
AnimationDemo02({Key key}) : super(key: key);
@override
_AnimationDemo02State createState() => _AnimationDemo02State();
}
class _AnimationDemo02State extends State<AnimationDemo02>
with SingleTickerProviderStateMixin {
AnimationController controller;
Animation<double> animation;
Animation<Color> colorAnim;
Animation<double> sizeAnim;
Animation<double> rotationAnim;
@override
void initState() {
super.initState();
//1.创建AnimationController
controller =
AnimationController(duration: Duration(seconds: 2), vsync: this);
//2.动画添加Curve效果
animation = CurvedAnimation(parent: controller, curve: Curves.easeIn);
//3.监听动画
animation.addListener(() {
setState(() {});
});
animation.addStatusListener((AnimationStatus status) {
if (status == AnimationStatus.completed) {
controller.reverse();
} else if (status == AnimationStatus.dismissed) {
controller.forward();
}
});
//4.设置值的变化
colorAnim =
ColorTween(begin: Colors.blue, end: Colors.red).animate(controller);
sizeAnim = Tween(begin: 0.0, end: 200.0).animate(controller);
rotationAnim = Tween(begin: 0.0, end: 2 * pi).animate(controller);
}
@override
Widget build(BuildContext context) {
debugPrint("_AnimationDemo02State build ---- ");
return Center(
child: AnimatedBuilder(
animation: animation,
builder: (BuildContext context, Widget child) {
return Opacity(
opacity: animation.value,
child: Transform(
alignment: Alignment.center,
transform: Matrix4.rotationZ(rotationAnim.value),
child: Container(
width: sizeAnim.value,
height: sizeAnim.value,
color: colorAnim.value,
alignment: Alignment.center,
),
),
);
},
),
);
}
@override
void dispose() {
controller.dispose();
super.dispose();
}
}
|
