How to autoscroll text in flutter?

Question

What I am trying to achieve is a multiline text that will autoscroll at a fixed speed until the end of the list.

AutoScroll Example

This is a different application that does similar thing. Is there anyway to do this in flutter?

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.
    );
  }
}

I added bunch of lorem ipsum text to autoscroll. to the bottom at a certain speed. In the current setup the text auto scrolls to the bottom in 30 seconds.

But what I would like to have is a button which I can press to start this scroll. And instead of time if possible use a speed.

Edit: With the answer below the text does scroll. But the issue I am having is the scrolling stops if I do any manual intervention. Is there any way to resume scrolling without repressing the button again?

Thanks in advance.

Yes. With the code i have it starts doing that on page load. I am sure i can do that with a button to. But of stop the scrolling manually I want it to keep going. If that makes any sense. — moficodes, Jul 22 '19 at 04:42
Like as the scrolling animation is happening, if i touch the screen it stops scrolling. — moficodes, Jul 22 '19 at 04:44

10101010 · Accepted Answer · 2019-07-23T05:08:41.017

Added a variable called speedFactor. Increasing it will increase the scroll speed and vice versa.

Having a constant duration would decrease the speed as we scroll towards the bottom. This is because we are trying to cover different distances in the same duration which would mean your speed has to vary.

So to handle that I am adjusting the duration to maintain a constant speed factor.

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

To stop the animation I just animateTo the current offset which would just stop the animation as we are already at the offset and there is nothing more to animate to.

Here is a working example

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.
    );
  }
}

UPDATE: Added code which makes the scrollview continue scrolling after user interruption.

Thank you for this. Do you know how I can restart the scroll after I touch the screen or manually scroll myself. As of now if you touch the screen while the animation is going on it just stops. — moficodes, Jul 23 '19 at 04:24
Yes if you click the button again it will continue scrolling. — 10101010, Jul 23 '19 at 04:25
what I am asking is, if there is anyway to make the scroll start back up after the user have stopped scrolling or touching the screen. — moficodes, Jul 23 '19 at 04:27

How to autoscroll text in flutter?

1 Answers1

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