flutter_twin_scroller 0.0.1+2 
flutter_twin_scroller: ^0.0.1+2 copied to clipboard
ranierjardim.comA Flutter package to sync scroll position between multiple ScrollControllers
import 'package:flutter/material.dart';
import 'package:flutter_twin_scroller/flutter_twin_scroller.dart';
import 'dart:math' as math;
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'TwinScroller Demo'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final verticalTwinScrollController = TwinScrollController();
final verticalScrollController1 = ScrollController();
final verticalScrollController2 = ScrollController();
final horizontalTwinScrollController = TwinScrollController();
final horizontalScrollController1 = ScrollController();
final horizontalScrollController2 = ScrollController();
final horizontalScrollController3 = ScrollController();
int stackIndex = 0;
int _counter = 20;
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: IndexedStack(
index: stackIndex,
children: [
Column(
children: [
TwinScroller(
controller: horizontalTwinScrollController,
childScrollController: horizontalScrollController1,
child: Container(
height: 60,
color: Color((math.Random().nextDouble() * 0xFFFFFF).toInt())
.withOpacity(0.3),
child: ListView.builder(
controller: horizontalScrollController1,
itemCount: _counter,
scrollDirection: Axis.horizontal,
itemBuilder: (context, index) {
return Container(
color: Color(
(math.Random().nextDouble() * 0xFFFFFF).toInt())
.withOpacity(0.3),
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
children: [
Text(
'Item: $index',
style: const TextStyle(color: Colors.black),
)
],
),
),
);
},
),
),
),
Flexible(
child: Row(
children: <Widget>[
Flexible(
child: TwinScroller(
controller: verticalTwinScrollController,
childScrollController: verticalScrollController1,
child: Container(
color: Color((math.Random().nextDouble() * 0xFFFFFF)
.toInt())
.withOpacity(0.3),
child: ListView.builder(
controller: verticalScrollController1,
itemCount: _counter,
itemBuilder: (context, index) {
return Container(
color: Color(
(math.Random().nextDouble() * 0xFFFFFF)
.toInt())
.withOpacity(0.3),
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
children: [
Text(
'Item: $index',
style: const TextStyle(
color: Colors.black),
)
],
),
),
);
},
),
),
),
),
Flexible(
child: TwinScroller(
controller: verticalTwinScrollController,
childScrollController: verticalScrollController2,
child: Container(
color: Color((math.Random().nextDouble() * 0xFFFFFF)
.toInt())
.withOpacity(0.1),
child: ListView.builder(
controller: verticalScrollController2,
itemCount: _counter,
itemBuilder: (context, index) {
return Container(
color: Color(
(math.Random().nextDouble() * 0xFFFFFF)
.toInt())
.withOpacity(0.3),
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
children: [
Text(
'Item: $index',
style: const TextStyle(
color: Colors.black),
)
],
),
),
);
},
),
),
),
),
],
),
),
],
),
Column(
children: [
TwinScroller(
controller: horizontalTwinScrollController,
childScrollController: horizontalScrollController2,
child: Container(
height: 60,
color: Color((math.Random().nextDouble() * 0xFFFFFF).toInt())
.withOpacity(0.3),
child: ListView.builder(
controller: horizontalScrollController2,
itemCount: _counter,
scrollDirection: Axis.horizontal,
itemBuilder: (context, index) {
return Container(
color: Color(
(math.Random().nextDouble() * 0xFFFFFF).toInt())
.withOpacity(0.3),
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
children: [
Text(
'Item: $index',
style: const TextStyle(color: Colors.black),
)
],
),
),
);
},
),
),
),
Expanded(
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headlineMedium,
),
],
),
),
),
],
),
Column(
children: [
TwinScroller(
controller: horizontalTwinScrollController,
childScrollController: horizontalScrollController3,
child: Container(
height: 60,
color: Color((math.Random().nextDouble() * 0xFFFFFF).toInt())
.withOpacity(0.3),
child: ListView.builder(
controller: horizontalScrollController3,
itemCount: _counter,
scrollDirection: Axis.horizontal,
itemBuilder: (context, index) {
return Container(
color: Color(
(math.Random().nextDouble() * 0xFFFFFF).toInt())
.withOpacity(0.3),
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
children: [
Text(
'Item: $index',
style: const TextStyle(color: Colors.black),
)
],
),
),
);
},
),
),
),
Expanded(
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
MaterialButton(
child: const Text(
'Open Multiple TwinScrollers Page',
style: TextStyle(color: Colors.white),
),
color: Colors.blue,
onPressed: () {
horizontalTwinScrollController.holdPositions();
Navigator.of(context).push(
MaterialPageRoute(
builder: (context) => ThreeTwinScrollerScreen(
horizontalTwinScrollController:
horizontalTwinScrollController,
)),
);
},
),
],
),
),
),
],
),
],
),
bottomNavigationBar: BottomNavigationBar(
currentIndex: stackIndex,
onTap: (index) {
setState(() {
stackIndex = index;
});
},
items: const [
BottomNavigationBarItem(
icon: Icon(
Icons.view_list,
),
label: 'Dual List',
),
BottomNavigationBarItem(
icon: Icon(
Icons.view_list,
),
label: 'Counter',
),
BottomNavigationBarItem(
icon: Icon(
Icons.view_list,
),
label: 'Multiple Page',
),
],
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
), // This tr
);
}
}
class ThreeTwinScrollerScreen extends StatefulWidget {
final TwinScrollController horizontalTwinScrollController;
const ThreeTwinScrollerScreen(
{Key? key, required this.horizontalTwinScrollController})
: super(key: key);
@override
State<ThreeTwinScrollerScreen> createState() =>
_ThreeTwinScrollerScreenState();
}
class _ThreeTwinScrollerScreenState extends State<ThreeTwinScrollerScreen> {
final horizontalScrollController1 = ScrollController();
final int _counter = 20;
final verticalTwinScrollController = TwinScrollController();
final verticalScrollController1 = ScrollController();
final verticalScrollController2 = ScrollController();
final verticalScrollController3 = ScrollController();
final verticalScrollController4 = ScrollController();
final verticalScrollController5 = ScrollController();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Multiple TwinScroller Scrolls'),
),
body: Column(
children: [
TwinScroller(
controller: widget.horizontalTwinScrollController,
childScrollController: horizontalScrollController1,
child: Container(
height: 60,
color: Color((math.Random().nextDouble() * 0xFFFFFF).toInt())
.withOpacity(0.3),
child: ListView.builder(
controller: horizontalScrollController1,
itemCount: _counter,
scrollDirection: Axis.horizontal,
itemBuilder: (context, index) {
return Container(
color:
Color((math.Random().nextDouble() * 0xFFFFFF).toInt())
.withOpacity(0.3),
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
children: [
Text(
'Item: $index',
style: const TextStyle(color: Colors.black),
)
],
),
),
);
},
),
),
),
Flexible(
child: Row(
children: <Widget>[
Flexible(
child: TwinScroller(
controller: verticalTwinScrollController,
childScrollController: verticalScrollController1,
child: Container(
color:
Color((math.Random().nextDouble() * 0xFFFFFF).toInt())
.withOpacity(0.3),
child: ListView.builder(
controller: verticalScrollController1,
itemCount: _counter,
itemBuilder: (context, index) {
return Container(
color: Color((math.Random().nextDouble() * 0xFFFFFF)
.toInt())
.withOpacity(0.3),
child: Padding(
padding: const EdgeInsets.symmetric(
vertical: 9.0, horizontal: 8.0),
child: Row(
children: [
Text(
'Item: $index',
style: const TextStyle(color: Colors.black),
)
],
),
),
);
},
),
),
),
),
Flexible(
child: TwinScroller(
controller: verticalTwinScrollController,
childScrollController: verticalScrollController2,
child: Container(
color:
Color((math.Random().nextDouble() * 0xFFFFFF).toInt())
.withOpacity(0.1),
child: ListView.builder(
controller: verticalScrollController2,
itemCount: _counter,
itemBuilder: (context, index) {
return Container(
color: Color((math.Random().nextDouble() * 0xFFFFFF)
.toInt())
.withOpacity(0.3),
child: Padding(
padding: const EdgeInsets.symmetric(
vertical: 10.0, horizontal: 8.0),
child: Row(
children: [
Text(
'Item: $index',
style: const TextStyle(color: Colors.black),
)
],
),
),
);
},
),
),
),
),
Flexible(
child: TwinScroller(
controller: verticalTwinScrollController,
childScrollController: verticalScrollController3,
child: Container(
color:
Color((math.Random().nextDouble() * 0xFFFFFF).toInt())
.withOpacity(0.1),
child: ListView.builder(
controller: verticalScrollController3,
itemCount: _counter,
itemBuilder: (context, index) {
return Container(
color: Color((math.Random().nextDouble() * 0xFFFFFF)
.toInt())
.withOpacity(0.3),
child: Padding(
padding: const EdgeInsets.symmetric(
vertical: 11.0, horizontal: 8.0),
child: Row(
children: [
Text(
'Item: $index',
style: const TextStyle(color: Colors.black),
)
],
),
),
);
},
),
),
),
),
Flexible(
child: TwinScroller(
controller: verticalTwinScrollController,
childScrollController: verticalScrollController4,
child: Container(
color:
Color((math.Random().nextDouble() * 0xFFFFFF).toInt())
.withOpacity(0.1),
child: ListView.builder(
controller: verticalScrollController4,
itemCount: _counter,
itemBuilder: (context, index) {
return Container(
color: Color((math.Random().nextDouble() * 0xFFFFFF)
.toInt())
.withOpacity(0.3),
child: Padding(
padding: const EdgeInsets.symmetric(
vertical: 12.0, horizontal: 8.0),
child: Row(
children: [
Text(
'Item: $index',
style: const TextStyle(color: Colors.black),
)
],
),
),
);
},
),
),
),
),
Flexible(
child: TwinScroller(
controller: verticalTwinScrollController,
childScrollController: verticalScrollController5,
child: Container(
color:
Color((math.Random().nextDouble() * 0xFFFFFF).toInt())
.withOpacity(0.1),
child: ListView.builder(
controller: verticalScrollController5,
itemCount: _counter,
itemBuilder: (context, index) {
return Container(
color: Color((math.Random().nextDouble() * 0xFFFFFF)
.toInt())
.withOpacity(0.3),
child: Padding(
padding: const EdgeInsets.symmetric(
vertical: 13.0, horizontal: 8.0),
child: Row(
children: [
Text(
'Item: $index',
style: const TextStyle(color: Colors.black),
)
],
),
),
);
},
),
),
),
),
],
),
),
],
),
);
}
}Metadata
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Metadata
A Flutter package to sync scroll position between multiple ScrollControllers
Repository (GitHub)
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Documentation
License
MIT (license)
