如何在颤动中自动滚动文本？

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【中文标题】如何在颤动中自动滚动文本？【英文标题】：How to autoscroll text in flutter? 【发布时间】：2019-11-30 00:02:25 【问题描述】：

我想要实现的是一个多行文本，它将以固定速度自动滚动到列表末尾。

这是一个做类似事情的不同应用程序。有没有办法在颤振中做到这一点？

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget 
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) 
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  


class MyHomePage extends StatelessWidget 
  ScrollController _scrollController = ScrollController();
  _scrollToBottom() 
    _scrollController.animateTo(_scrollController.position.maxScrollExtent,
        duration: Duration(seconds: 30), curve: Curves.linear);
  

  @override
  Widget build(BuildContext context) 
    WidgetsBinding.instance.addPostFrameCallback((_) => _scrollToBottom());
    String val = '''
BUNCH OF TEXT HERE.
''';
    return Scaffold(
      appBar: AppBar(
        title: Text('Lyrics'),
      ),
      body: SingleChildScrollView(
        controller: _scrollController,
        child: Text(
          val,
          maxLines: 1000,
        ),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );

我在自动滚动中添加了一堆 lorem ipsum 文本。以一定的速度下降到底部。在当前设置中，文本会在 30 秒后自动滚动到底部。

但我想要的是一个按钮，我可以按下它来启动这个滚动。如果可能，请使用速度来代替时间。

编辑：下面的答案会滚动。但是我遇到的问题是，如果我进行任何手动干预，滚动就会停止。有什么方法可以在不再次按下按钮的情况下恢复滚动？

提前致谢。

【问题讨论】：

是不是就像你点击按钮一次，它就一直滚动？ 是的。使用我拥有的代码，它在页面加载时开始执行此操作。我相信我可以用一个按钮来做到这一点。但是手动停止滚动我希望它继续前进。如果这有任何意义。 But of stop the scrolling manually 没听懂。 就像滚动动画一样，如果我触摸屏幕它会停止滚动。 【参考方案1】：

添加了一个名为 speedFactor 的变量。增加它会增加滚动速度，反之亦然。

当我们滚动到底部时，具有恒定的持续时间会降低速度。这是因为我们试图在相同的持续时间内覆盖不同的距离，这意味着您的速度必须有所不同。

为了解决这个问题，我正在调整持续时间以保持恒定的速度因子。

double maxExtent = _scrollController.position.maxScrollExtent;
double distanceDifference = maxExtent - _scrollController.offset;
double durationDouble = distanceDifference / speedFactor;

要停止动画，我只需 animateTo 当前的 offset 即可停止动画，因为我们已经在偏移处，没有其他动画可做。

这是一个工作示例

import 'package:flutter/material.dart';
import 'dart:async';

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

class MyApp extends StatelessWidget 
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) 
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  


class MyHomePage extends StatefulWidget 
  @override
  _MyHomePageState createState() => _MyHomePageState();


class _MyHomePageState extends State<MyHomePage> with TickerProviderStateMixin 
  ScrollController _scrollController = ScrollController();
  bool scroll = false;
  int speedFactor = 20;

  _scroll() 
    double maxExtent = _scrollController.position.maxScrollExtent;
    double distanceDifference = maxExtent - _scrollController.offset;
    double durationDouble = distanceDifference / speedFactor;

    _scrollController.animateTo(_scrollController.position.maxScrollExtent,
        duration: Duration(seconds: durationDouble.toInt()),
        curve: Curves.linear);
  

  _toggleScrolling() 
    setState(() 
      scroll = !scroll;
    );

    if (scroll) 
      _scroll();
     else 
      _scrollController.animateTo(_scrollController.offset,
          duration: Duration(seconds: 1), curve: Curves.linear);
    
  

  @override
  Widget build(BuildContext context) 
    String val = '''
BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE.BUNCH OF TEXT HERE.BUNCH OF TEXT HERE.BUNCH OF TEXT HERE.BUNCH OF TEXT HERE.BUNCH OF TEXT HERE.BUNCH OF TEXT HERE. BUNCH OF TEXT HERE.v 
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''';
    return Scaffold(
      appBar: AppBar(
        title: Text('Lyrics'),
      ),
      body: NotificationListener(
        onNotification: (notif) 
          if (notif is ScrollEndNotification && scroll) 
            Timer(Duration(seconds: 1), () 
              _scroll();
            );
          

          return true;
        ,
        child: SingleChildScrollView(
          controller: _scrollController,
          child: Text(
            val,
            maxLines: 1000,
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(onPressed: () 
        _toggleScrolling();
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );

更新：添加了使滚动视图在用户中断后继续滚动的代码。

【讨论】：

谢谢你。你知道我在触摸屏幕或手动滚动后如何重新开始滚动吗？到目前为止，如果您在动画播放时触摸屏幕，它就会停止。 是的，如果您再次单击该按钮，它将继续滚动。 我要问的是，在用户停止滚动或触摸屏幕后是否有办法让滚动重新开始。 是的，我们可以做到，但它需要更多的代码。 更新了我的答案

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