Scrollbar

sample.packages.flutter.lib.src.material.scrollbar.38.

This sample shows a [Scrollbar] that executes a fade animation as scrolling occurs. The Scrollbar will fade into view as the user scrolls, and fade out when scrolling stops.

  
import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: const MyStatelessWidget(),
      ),
    );
  }
}

class MyStatelessWidget extends StatelessWidget {
  const MyStatelessWidget({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scrollbar(
      child: GridView.builder(
        itemCount: 120,
        gridDelegate:
            const SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 3),
        itemBuilder: (BuildContext context, int index) {
          return Center(
            child: Text('item $index'),
          );
        },
      ),
    );
  }
}
  

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