【Flutter】【packages】simple_animations 简单的实现动画

package：simple_animations

导入包到项目中去

• 可以实现简单的动画，
• 快速实现，不需要自己过多的设置
• 有多种样式可以实现
• [ ]

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功能：

简单的用例：具体需要详细可以去 pub 链接地址

1. PlayAnimationBuilder

PlayAnimationBuilder<double>(tween: Tween(begin: 100.0, end: 200.0), //数值是100 到00duration: const Duration(seconds: 1), // 动画的时间，是1s 完成动画builder: (context, value, _) {return Container(width: value, // 使用tween 的数值height: value,color: Colors.blue,);},onCompleted: () {// 结束的时候做什么操作},onStarted: (){//在开始的时候运行什么，做什么操作},)

新增child 参数，静态的child ,减少资源的浪费，其他的build 同样可以这样使用

PlayAnimationBuilder<double>(tween: Tween(begin: 50.0, end: 200.0),duration: const Duration(seconds: 5),child: const Center(child: Text('Hello!')), // pass in static childbuilder: (context, value, child) {return Container(width: value,height: value,color: Colors.green,child: child, // use child inside the animation);},)

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2.LoopAnimationBuilder 循环动画

该用例，是一个正方形旋转360度，并且持续的转动

Center(child: LoopAnimationBuilder<double>(tween: Tween(begin: 0.0, end: 2 * pi), // 0° to 360° (2π)duration: const Duration(seconds: 2), // for 2 seconds per iterationbuilder: (context, value, _) {return Transform.rotate(angle: value, // use valuechild: Container(color: Colors.blue, width: 100, height: 100),);},),)

3.MirrorAnimationBuilder 镜像动画

        MirrorAnimationBuilder<double>(tween:Tween(begin: -100.0, end: 100.0), // x 轴的数值duration: const Duration(seconds: 2),//动画时间curve: Curves.easeInOutSine, // 动画曲线builder: (context, value, child) {return Transform.translate(offset: Offset(value, 0), // use animated value for x-coordinatechild: child,);},child: Container(width: 100,height: 100,color: Colors.green,),)

4.CustomAnimationBuilder 自定义动画，可以在stl 无状态里面使用

        CustomAnimationBuilder<double>(control: Control.mirror,tween: Tween(begin: 100.0, end: 200.0),duration: const Duration(seconds: 2),delay: const Duration(seconds: 1),//延迟1s才开始动画curve: Curves.easeInOut,startPosition: 0.5,animationStatusListener: (status) {//状态的监听，可以在这边做一些操作debugPrint('status updated: $status');},builder: (context, value, child) {return Container(width: value,height: value,color: Colors.blue,child: child,);},child: const Center(child: Text('Hello!',style: TextStyle(color: Colors.white, fontSize: 24))),)

带控制器

        CustomAnimationBuilder<double>(duration: const Duration(seconds: 1),control: control, // bind state variable to parametertween: Tween(begin: -100.0, end: 100.0),builder: (context, value, child) {return Transform.translate(// animation that moves childs from left to rightoffset: Offset(value, 0),child: child,);},child: MaterialButton(// there is a buttoncolor: Colors.yellow,onPressed: () {setState(() {control = (control == Control.play)? Control.playReverse: Control.play;});}, // clicking button changes animation directionchild: const Text('Swap'),),)

5.MovieTween 补间动画，可并行的动画

可以一个widget 多个动画同时或者不同时的运行

final MovieTween tween = MovieTween()..scene(begin: const Duration(milliseconds: 0),end: const Duration(milliseconds: 1000)).tween('width', Tween(begin: 0.0, end: 100.0)) //0-1秒的的 width 的数值..scene(begin: const Duration(milliseconds: 1000),end: const Duration(milliseconds: 1500)).tween('width', Tween(begin: 100.0, end: 200.0)) //1-1。5秒的的 width 的数值..scene(begin: const Duration(milliseconds: 0),duration: const Duration(milliseconds: 2500)).tween('height', Tween(begin: 0.0, end: 200.0)) //0-2.5秒的的 height 的数值..scene(begin: const Duration(milliseconds: 0),duration: const Duration(milliseconds: 3000)) //0-3 秒的的 颜色 的数值.tween('color', ColorTween(begin: Colors.red, end: Colors.blue));PlayAnimationBuilder<Movie>(tween: tween, // Pass in tweenduration: tween.duration, // Obtain durationbuilder: (context, value, child) {return Container(width: value.get('width'), // Get animated valuesheight: value.get('height'),color: value.get('color'),);},),

6.MovieTween 串行的动画补间

简单的意思就是，按照设计的动画一个一个执行，按照顺序来执行，可以设置不同的数值或者是参数来获取，然后改变动画

final signaltween = MovieTween()..tween('x', Tween(begin: -100.0, end: 100.0),duration: const Duration(seconds: 1)).thenTween('y', Tween(begin: -100.0, end: 100.0),duration: const Duration(seconds: 1)).thenTween('x', Tween(begin: 100.0, end: -100.0),duration: const Duration(seconds: 1)).thenTween('y', Tween(begin: 100.0, end: -100.0),duration: const Duration(seconds: 1));LoopAnimationBuilder<Movie>(tween: signaltween,builder: (ctx, value, chid) {return Transform.translate(offset: Offset(value.get('x'), value.get('y')),child: Container(width: 100,height: 100,color: Colors.green,));},duration: signaltween.duration,
),

总的代码：

import 'dart:math';import 'package:flutter/material.dart';
import 'package:simple_animations/simple_animations.dart';void main() {runApp(const MaterialApp(home: Scaffold(body: MyPage())));
}class MyPage extends StatefulWidget {const MyPage({Key? key}) : super(key: key);@overrideState<MyPage> createState() => _MyPageState();
}class _MyPageState extends State<MyPage> {Control control = Control.play; // state variablevoid toggleDirection() {// toggle between control instructionssetState(() {control = (control == Control.play) ? Control.playReverse : Control.play;});}@overrideWidget build(BuildContext context) {
//电影样式的动画final MovieTween tween = MovieTween()..scene(begin: const Duration(milliseconds: 0),end: const Duration(milliseconds: 1000)).tween('width', Tween(begin: 0.0, end: 100.0)) //0-1秒的的 width 的数值..scene(begin: const Duration(milliseconds: 1000),end: const Duration(milliseconds: 1500)).tween('width', Tween(begin: 100.0, end: 200.0)) //1-1。5秒的的 width 的数值..scene(begin: const Duration(milliseconds: 0),duration: const Duration(milliseconds: 2500)).tween('height', Tween(begin: 0.0, end: 200.0)) //0-2.5秒的的 height 的数值..scene(begin: const Duration(milliseconds: 0),duration: const Duration(milliseconds: 3000)) //0-3 秒的的 颜色 的数值.tween('color', ColorTween(begin: Colors.red, end: Colors.blue));final signaltween = MovieTween()..tween('x', Tween(begin: -100.0, end: 100.0),duration: const Duration(seconds: 1)).thenTween('y', Tween(begin: -100.0, end: 100.0),duration: const Duration(seconds: 1)).thenTween('x', Tween(begin: 100.0, end: -100.0),duration: const Duration(seconds: 1)).thenTween('y', Tween(begin: 100.0, end: -100.0),duration: const Duration(seconds: 1));return SingleChildScrollView(child: Column(children: [LoopAnimationBuilder<Movie>(tween: signaltween,builder: (ctx, value, chid) {return Transform.translate(offset: Offset(value.get('x'), value.get('y')),child: Container(width: 100,height: 100,color: Colors.green,));},duration: signaltween.duration,),PlayAnimationBuilder<Movie>(tween: tween, // Pass in tweenduration: tween.duration, // Obtain durationbuilder: (context, value, child) {return Container(width: value.get('width'), // Get animated valuesheight: value.get('height'),color: value.get('color'),);},),PlayAnimationBuilder<double>(tween: Tween(begin: 100.0, end: 200.0), //数值是100 到00duration: const Duration(seconds: 1), // 动画的时间，是1s 完成动画builder: (context, value, _) {return Container(width: value, // 使用tween 的数值height: value,color: Colors.blue,);},onCompleted: () {// 结束的时候做什么操作},onStarted: () {//在开始的时候运行什么，做什么操作},),MirrorAnimationBuilder<Color?>(tween:ColorTween(begin: Colors.red, end: Colors.blue), // 颜色的渐变 红色到蓝色duration: const Duration(seconds: 5), // 动画时长5秒builder: (context, value, _) {return Container(color: value, // 使用该数值width: 100,height: 100,);},),//实现一个绿色箱子从左到右，从右到走MirrorAnimationBuilder<double>(tween: Tween(begin: -100.0, end: 100.0), // x 轴的数值duration: const Duration(seconds: 2), //动画时间curve: Curves.easeInOutSine, // 动画曲线builder: (context, value, child) {return Transform.translate(offset: Offset(value, 0), // use animated value for x-coordinatechild: child,);},child: Container(width: 100,height: 100,color: Colors.green,),),CustomAnimationBuilder<double>(control: Control.mirror,tween: Tween(begin: 100.0, end: 200.0),duration: const Duration(seconds: 2),delay: const Duration(seconds: 1),curve: Curves.easeInOut,startPosition: 0.5,animationStatusListener: (status) {debugPrint('status updated: $status');},builder: (context, value, child) {return Container(width: value,height: value,color: Colors.blue,child: child,);},child: const Center(child: Text('Hello!',style: TextStyle(color: Colors.white, fontSize: 24))),),CustomAnimationBuilder<double>(duration: const Duration(seconds: 1),control: control, // bind state variable to parametertween: Tween(begin: -100.0, end: 100.0),builder: (context, value, child) {return Transform.translate(// animation that moves childs from left to rightoffset: Offset(value, 0),child: child,);},child: MaterialButton(// there is a buttoncolor: Colors.yellow,onPressed: () {setState(() {control = (control == Control.play)? Control.playReverse: Control.play;});}, // clicking button changes animation directionchild: const Text('Swap'),),)],),);}
}

混合多种动画

import 'dart:math';import 'package:flutter/material.dart';
import 'package:simple_animations/simple_animations.dart';void main() {runApp(const MaterialApp(home: Scaffold(body: MyPage())));
}class MyPage extends StatefulWidget {const MyPage({Key? key}) : super(key: key);@overrideState<MyPage> createState() => _MyPageState();
}class _MyPageState extends State<MyPage> {Control control = Control.play; // state variable@overrideWidget build(BuildContext context) {final x = MovieTweenProperty<double>();final y = MovieTweenProperty<double>();final color = MovieTweenProperty<Color>();final tween = MovieTween()..scene(begin: const Duration(seconds: 0),duration: const Duration(seconds: 1)).tween(x, Tween(begin: -100.0, end: 100.0),curve: Curves.easeInOutSine).tween(color, ColorTween(begin: Colors.red, end: Colors.yellow))..scene(begin: const Duration(seconds: 1),duration: const Duration(seconds: 1)).tween(y, Tween(begin: -100.0, end: 100.0),curve: Curves.easeInOutSine)..scene(begin: const Duration(seconds: 2),duration: const Duration(seconds: 1)).tween(x, Tween(begin: 100.0, end: -100.0),curve: Curves.easeInOutSine)..scene(begin: const Duration(seconds: 1),end: const Duration(seconds: 3)).tween(color, ColorTween(begin: Colors.yellow, end: Colors.blue))..scene(begin: const Duration(seconds: 3),duration: const Duration(seconds: 1)).tween(y, Tween(begin: 100.0, end: -100.0),curve: Curves.easeInOutSine).tween(color, ColorTween(begin: Colors.blue, end: Colors.red));return MaterialApp(home: Scaffold(backgroundColor: Colors.white,body: Center(child: LoopAnimationBuilder<Movie>(tween: tween, // Pass in tweenduration: tween.duration, // Obtain durationbuilder: (context, value, child) {return Transform.translate(// Get animated offsetoffset: Offset(x.from(value), y.from(value)),child: Container(width: 100,height: 100,color: color.from(value), // Get animated color),);},),),),);}
}

同原生的动画混合开发

以下代码实现，一个container 的宽高的尺寸变化

class MyPage extends StatefulWidget {const MyPage({Key? key}) : super(key: key);@overrideState<MyPage> createState() => _MyPageState();
}class _MyPageState extends State<MyPage> with AnimationMixin {//同原生的混合使用// Control control = Control.play; // state variablelate Animation<double> size;@overridevoid initState() {super.initState();// controller 不需要重新定义，AnimationMixin 里面已经自动定义了个size = Tween(begin: 0.0, end: 200.0).animate(controller);controller.play(); //运行}@overrideWidget build(BuildContext context) {return MaterialApp(home: Scaffold(backgroundColor: Colors.white,body: Center(child: Container(width: size.value,height: size.value,color: Colors.red,),),),);}
}

多个控制器控制一个widget的实现多维度的动画实现

import 'dart:math';import 'package:flutter/material.dart';
import 'package:simple_animations/simple_animations.dart';void main() {runApp(const MaterialApp(home: Scaffold(body: MyPage())));
}class MyPage extends StatefulWidget {const MyPage({Key? key}) : super(key: key);@overrideState<MyPage> createState() => _MyPageState();
}class _MyPageState extends State<MyPage> with AnimationMixin {//同原生的混合使用late AnimationController widthcontrol; //宽度控制late AnimationController heigthcontrol; //高度控制器late AnimationController colorcontrol; //颜色控制器late Animation<double> width; //宽度控制late Animation<double> heigth; //高度控制late Animation<Color?> color; //颜色控制@overridevoid initState() {
// mirror 镜像widthcontrol = createController()..mirror(duration: const Duration(seconds: 5));heigthcontrol = createController()..mirror(duration: const Duration(seconds: 3));colorcontrol = createController()..mirror(duration: const Duration(milliseconds: 1500));width = Tween(begin: 100.0, end: 200.0).animate(widthcontrol);heigth = Tween(begin: 100.0, end: 200.0).animate(heigthcontrol);color = ColorTween(begin: Colors.green, end: Colors.black).animate(colorcontrol);super.initState();}@overrideWidget build(BuildContext context) {return MaterialApp(home: Scaffold(backgroundColor: Colors.white,body: Center(child: Container(width: width.value,height: heigth.value,color: color.value,),),),);}
}