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Description:

scroll to id

Scroll to id #
scroll_to_id is a Flutter library for Scroll to id in ScrollView

Installing #
You should add the following to your pubspec.yaml file:
dependencies:
scroll_to_id: ^1.5.1
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Getting Started #
To start, import the dependency in your code:
import 'package:scroll_to_id/scroll_to_id.dart';
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Next, to define ScrollController:
final scrollController = ScrollController();
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Next, to create instance with ScrollController:
ScrollToId scrollToId = ScrollToId(scrollController: scrollController);
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Next, to set InteractiveScrollViewer and ScrollContent:
InteractiveScrollViewer(
scrollToId: scrollToId,
children: <ScrollContent>[
ScrollContent(
id: 'a',
child: Container(
color: Colors.red,
width: 300,
height: 200,
)
),
ScrollContent(
id: 'b',
child: Container(
color: Colors.green,
width: 300,
height: 200,
)
),
],
)
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id property is destination of scroll.
Do not use the same id.
Next, to scroll to id:
/// animate
scrollToId.animateTo(
'b',
duration: Duration(milliseconds: 500),
curve: Curves.ease
);

/// jump
scrollToId.jumpTo('b');
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Examples #
import 'package:flutter/material.dart';
import 'package:scroll_to_id/scroll_to_id.dart';

void main() {
runApp(MyApp());
}

class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
ScrollToId scrollToId;
final ScrollController scrollController = ScrollController();

List<Color> _colorList = [
Colors.green,
Colors.red,
Colors.yellow,
Colors.blue
];

void _scrollListener() {
print(scrollToId.idPosition());
}

@override
void initState() {
super.initState();

/// Create ScrollToId instance
scrollToId = ScrollToId(scrollController: scrollController);

scrollController.addListener(_scrollListener);
}

/// Generate 10 Container
/// Case [Axis.horizontal] set buildStackHorizontal() to body
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Scroll to id',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Scaffold(
appBar: AppBar(
title: const Text('Scroll to id'),
),
body: buildStackVertical(),
),
);
}

/// [Axis.vertical]
/// https://raw.githubusercontent.com/wiki/yusukeinouehatchout/scroll_to_id/gif/scroll_to_id_vertical.gif
Widget buildStackVertical() {
return Stack(
alignment: Alignment.topRight,
children: [
InteractiveScrollViewer(
scrollToId: scrollToId,
children: List.generate(10, (index) {
return ScrollContent(
id: '$index',
child: Container(
alignment: Alignment.center,
width: double.infinity,
height: 200,
child: Text(
'$index',
style: TextStyle(color: Colors.white, fontSize: 50),
),
color: _colorList[index % _colorList.length],
),
);
}),
),
Container(
decoration: BoxDecoration(
border: Border.all(color: Colors.white, width: 3),
),
child: Column(
mainAxisSize: MainAxisSize.min,
children: List.generate(10, (index) {
return GestureDetector(
child: Container(
width: 100,
alignment: Alignment.center,
height: 50,
child: Text(
'$index',
style: TextStyle(color: Colors.white),
),
color: _colorList[index % _colorList.length],
),
onTap: () {
/// scroll with animation
scrollToId.animateTo('$index',
duration: Duration(milliseconds: 500),
curve: Curves.ease);

/// scroll with jump
// scrollToId.jumpTo('$index');
},
);
}),
),
)
],
);
}

/// [Axis.horizontal]
/// https://raw.githubusercontent.com/wiki/yusukeinouehatchout/scroll_to_id/gif/scroll_to_id_horizontal.gif
Widget buildStackHorizontal() {
return Column(
children: [
Container(
width: double.infinity,
decoration: BoxDecoration(
border: Border.all(color: Colors.white, width: 3),
),
child: Row(
mainAxisSize: MainAxisSize.min,
children: List.generate(10, (index) {
return Expanded(
child: GestureDetector(
child: Container(
alignment: Alignment.center,
height: 80,
child: Text(
'$index',
style: TextStyle(color: Colors.white),
),
color: _colorList[index % _colorList.length],
),
onTap: () {
/// scroll with animation
scrollToId.animateTo('$index',
duration: Duration(milliseconds: 500),
curve: Curves.ease);

/// scroll with jump
// scrollToId.jumpTo('$index');
},
),
);
}),
),
),
Expanded(
child: InteractiveScrollViewer(
scrollToId: scrollToId,
scrollDirection: Axis.horizontal,
children: List.generate(10, (index) {
return ScrollContent(
id: '$index',
child: Container(
alignment: Alignment.center,
width: 200,
child: Text(
'$index',
style: TextStyle(color: Colors.white, fontSize: 50),
),
color: _colorList[index % _colorList.length],
),
);
}),
),
),
],
);
}
}
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