// Copyright 2014 The Flutter Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. // Flutter code sample for SliverOpacity import 'package:flutter/material.dart'; void main() => runApp(const MyApp()); class MyApp extends StatelessWidget { const MyApp({super.key}); static const String _title = 'Flutter Code Sample'; @override Widget build(BuildContext context) { return const MaterialApp( title: _title, home: MyStatefulWidget(), ); } } class MyStatefulWidget extends StatefulWidget { const MyStatefulWidget({super.key}); @override State<MyStatefulWidget> createState() => _MyStatefulWidgetState(); } class _MyStatefulWidgetState extends State<MyStatefulWidget> { static const List<Widget> _listItems = <Widget>[ ListTile(title: Text('Now you see me,')), ListTile(title: Text("Now you don't!")), ]; bool _visible = true; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('SliverOpacity demo'), ), body: CustomScrollView( slivers: <Widget>[ const SliverToBoxAdapter( child: ListTile(title: Text('Press on the button to toggle the list visibilty.')), ), const SliverToBoxAdapter( child: ListTile(title: Text('Before the list...')), ), SliverOpacity( opacity: _visible ? 1.0 : 0.0, sliver: SliverList( delegate: SliverChildListDelegate(_listItems), ), ), const SliverToBoxAdapter( child: ListTile(title: Text('Before the list...')), ), ], ), floatingActionButton: FloatingActionButton( child: const Icon(Icons.disabled_visible), onPressed: () { setState(() { _visible = !_visible; }); }, ), ); } }