Created
May 1, 2021 00:15
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An example of ScrollController.
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import 'package:flutter/material.dart'; | |
final Color darkBlue = Color.fromARGB(255, 18, 32, 47); | |
void main() { | |
print(Colors.black.hashCode.toString()); | |
runApp(MyApp()); | |
} | |
class MyApp extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return MaterialApp( | |
theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue), | |
debugShowCheckedModeBanner: false, | |
home: Scaffold( | |
body: MyWidget(), | |
), | |
); | |
} | |
} | |
class MyWidget extends StatefulWidget { | |
@override | |
_MyWidgetState createState() => _MyWidgetState(); | |
} | |
class _MyWidgetState extends State<MyWidget> { | |
ScrollController _controller = ScrollController(); | |
void _onScrollEvent() { | |
final extentAfter = _controller.position.extentAfter; | |
print("Extent after: $extentAfter"); | |
if (extentAfter < 300) { | |
// Load new items | |
} | |
} | |
@override | |
void initState() { | |
_controller.addListener(_onScrollEvent); | |
super.initState(); | |
} | |
@override | |
void dispose() { | |
_controller.removeListener(_onScrollEvent); | |
super.dispose(); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return ListView.builder( | |
controller: _controller, | |
itemCount: 50, | |
itemBuilder: (context, index) { | |
return ListTile( | |
title: Text('List Item ${index + 1}') | |
); | |
} | |
); | |
} | |
} |
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