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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>
77 lines
2.1 KiB
Dart
77 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 [FadeTransition].
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void main() => runApp(const FadeTransitionExampleApp());
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class FadeTransitionExampleApp extends StatelessWidget {
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const FadeTransitionExampleApp({super.key});
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static const Duration duration = Duration(seconds: 2);
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static const Curve curve = Curves.easeIn;
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@override
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Widget build(BuildContext context) {
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return const MaterialApp(home: FadeTransitionExample(duration: duration, curve: curve));
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}
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}
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class FadeTransitionExample extends StatefulWidget {
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const FadeTransitionExample({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<FadeTransitionExample> createState() => _FadeTransitionExampleState();
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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 _FadeTransitionExampleState extends State<FadeTransitionExample>
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with TickerProviderStateMixin {
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late final AnimationController _controller = AnimationController(
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duration: widget.duration,
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vsync: this,
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)..repeat(reverse: true);
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late final CurvedAnimation _animation = CurvedAnimation(parent: _controller, curve: widget.curve);
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@override
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void didUpdateWidget(FadeTransitionExample oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (oldWidget.duration != widget.duration) {
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_controller
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..duration = widget.duration
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..repeat(reverse: true);
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}
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if (oldWidget.curve != widget.curve) {
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_animation.curve = widget.curve;
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}
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}
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@override
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void dispose() {
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_animation.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: FadeTransition(
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opacity: _animation,
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child: const Padding(padding: EdgeInsets.all(8), child: FlutterLogo()),
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),
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);
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}
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}
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