Flutter：多个动画 onTapDown

Question

如何让同一个动画在不同的地方同时播放。目前，每当我点击屏幕时，动画就会在那个地方开始播放 3 秒，但如果我再次按下另一个地方，动画就会跳到那个地方，但我希望它让旧动画结束。所以如果你按五次，屏幕上应该有五个动画，不像现在一次只播放一个。

这是我的代码。

class HomePage extends StatefulWidget{
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {


   double posx = -100.0;
  double posy = -100.0;

void onLongPressMoveUpdate(BuildContext context, LongPressMoveUpdateDetails details)

  {
    final RenderBox box = context.findRenderObject();
    final Offset localOffset = box.globalToLocal(details.globalPosition);

    var tempName = "tryck";
    setState(() {
      _tryckanimation = tempName;
      posx = localOffset.dx;
      posy = localOffset.dy;
    });

  }
  void onTapDown(BuildContext context, TapDownDetails details)

  {



    final RenderBox box = context.findRenderObject();
    final Offset localOffset = box.globalToLocal(details.globalPosition);

              var tempName = "tryck";
    setState(() {


      _tryckanimation = tempName;
      posx = localOffset.dx;
      posy = localOffset.dy;
    });

  }
 void onTapUp(BuildContext context, TapUpDetails details) 
 {
    final RenderBox box = context.findRenderObject();
    final Offset localOffset = box.globalToLocal(details.globalPosition);

              var tempName = "tryck";
    Future.delayed(const Duration(milliseconds: 3000), () {
  setState(() {
    setState(() {
      _tryckanimation = tempName;
      posx = -100.0;
      posy = -100.0;
       });
});
 });

  }

new GestureDetector(
      onTapDown: (TapDownDetails details) => onTapDown(context, details),
       onTapUp: (TapUpDetails details) => onTapUp(context, details),
       onLongPressMoveUpdate: (LongPressMoveUpdateDetails details) => onLongPressMoveUpdate(context, details),


      child: new Stack(fit: StackFit.expand, children: <Widget>[

        new Container(color: Colors.transparent,
        ),

            new Positioned(
            height: 100.0,
            width: 100.0,
            child: FlareActor(
              "assets/images/tryck2.flr",
             animation: _tryckanimation
            ),

            left: posx -50.0,
            top: posy- 50.0,



            ),

Answer 1

您必须为所有动画小部件设置相同的AnimationController。

试试这个

import 'dart:math';

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: Scaffold(
        body: HomePage(),
      ),
    );
  }
}

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage>
    with SingleTickerProviderStateMixin {
  final tappedPositions = <Offset>[];

  AnimationController _animationController;

  @override
  void initState() {
    _animationController = AnimationController(
      vsync: this,
      duration: const Duration(seconds: 2),
    );
    _animationController.repeat();
    super.initState();
  }

  final x = const CircularProgressIndicator();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("App Bar"),
      ),
      body: Stack(
        children: <Widget>[
          GestureDetector(
            onTapUp: (tabDetails) {
              setState(() {
                tappedPositions.add(tabDetails.localPosition);
              });
            },
            child: Container(
              color: Colors.white,
            ),
          ),
          for (final position in tappedPositions)
            Positioned(
              top: position.dy,
              left: position.dx,
              child: MyAnimatedWidget(
                animation: _animationController,
              ),
            ),
        ],
      ),
    );
  }
}

class MyAnimatedWidget extends StatelessWidget {
  final Animation animation;

  const MyAnimatedWidget({Key key, this.animation}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: animation,
      child: Icon(
        Icons.phone,
        color: Colors.blue,
        size: 30.0,
      ),
      builder: (context, child) {
        return Transform(
          alignment: Alignment.center,
          transform: Matrix4.identity()
            ..translate(animation.value)
            ..rotateY(pi * 2 * animation.value),
          child: child,
        );
      },
    );
  }
}

Flutter：多个动画 onTapDown

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