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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>
59 lines
1.8 KiB
Dart
59 lines
1.8 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 [AlignTransition].
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void main() => runApp(const AlignTransitionExampleApp());
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class AlignTransitionExampleApp extends StatelessWidget {
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const AlignTransitionExampleApp({super.key});
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@override
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Widget build(BuildContext context) {
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return const MaterialApp(home: AlignTransitionExample());
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}
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}
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class AlignTransitionExample extends StatefulWidget {
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const AlignTransitionExample({super.key});
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@override
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State<AlignTransitionExample> createState() => _AlignTransitionExampleState();
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}
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/// [AnimationController]s can be created with `vsync: this` because of
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/// [TickerProviderStateMixin].
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class _AlignTransitionExampleState extends State<AlignTransitionExample>
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with TickerProviderStateMixin {
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// Using `late final` for lazy initialization. See
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// https://dart.dev/null-safety/understanding-null-safety#lazy-initialization.
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late final AnimationController _controller = AnimationController(
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duration: const Duration(seconds: 2),
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vsync: this,
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)..repeat(reverse: true);
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late final Animation<AlignmentGeometry> _animation = Tween<AlignmentGeometry>(
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begin: Alignment.bottomLeft,
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end: Alignment.center,
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).animate(CurvedAnimation(parent: _controller, curve: Curves.decelerate));
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@override
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void dispose() {
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_controller.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return ColoredBox(
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color: Colors.white,
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child: AlignTransition(
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alignment: _animation,
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child: const Padding(padding: EdgeInsets.all(8.0), child: FlutterLogo(size: 150.0)),
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),
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);
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}
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}
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