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This auto-formats all *.dart files in the repository outside of the `engine` subdirectory and enforces that these files stay formatted with a presubmit check. **Reviewers:** Please carefully review all the commits except for the one titled "formatted". The "formatted" commit was auto-generated by running `dev/tools/format.sh -a -f`. The other commits were hand-crafted to prepare the repo for the formatting change. I recommend reviewing the commits one-by-one via the "Commits" tab and avoiding Github's "Files changed" tab as it will likely slow down your browser because of the size of this PR. --------- Co-authored-by: Kate Lovett <katelovett@google.com> Co-authored-by: LongCatIsLooong <31859944+LongCatIsLooong@users.noreply.github.com>
73 lines
2.1 KiB
Dart
73 lines
2.1 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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/// Flutter code sample for [SliverAnimatedOpacity].
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void main() => runApp(const SliverAnimatedOpacityExampleApp());
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class SliverAnimatedOpacityExampleApp extends StatelessWidget {
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const SliverAnimatedOpacityExampleApp({super.key});
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static const Duration duration = Duration(milliseconds: 500);
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static const Curve curve = Curves.easeInOut;
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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home: Scaffold(
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appBar: AppBar(title: const Text('SliverAnimatedOpacity Sample')),
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body: const Center(child: SliverAnimatedOpacityExample(duration: duration, curve: curve)),
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),
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);
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}
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}
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class SliverAnimatedOpacityExample extends StatefulWidget {
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const SliverAnimatedOpacityExample({required this.duration, required this.curve, super.key});
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final Duration duration;
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final Curve curve;
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@override
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State<SliverAnimatedOpacityExample> createState() => _SliverAnimatedOpacityExampleState();
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}
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class _SliverAnimatedOpacityExampleState extends State<SliverAnimatedOpacityExample>
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with SingleTickerProviderStateMixin {
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bool _visible = true;
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@override
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Widget build(BuildContext context) {
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return CustomScrollView(
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slivers: <Widget>[
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SliverAnimatedOpacity(
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opacity: _visible ? 1.0 : 0.0,
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duration: widget.duration,
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curve: widget.curve,
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sliver: SliverFixedExtentList(
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itemExtent: 100.0,
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delegate: SliverChildBuilderDelegate((BuildContext context, int index) {
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return Container(color: index.isEven ? Colors.indigo[200] : Colors.orange[200]);
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}, childCount: 5),
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),
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),
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SliverToBoxAdapter(
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child: FloatingActionButton(
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onPressed: () {
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setState(() {
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_visible = !_visible;
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});
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},
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tooltip: 'Toggle opacity',
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child: const Icon(Icons.flip),
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),
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),
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],
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);
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}
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}
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