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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>
100 lines
2.8 KiB
Dart
100 lines
2.8 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 [Flow].
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void main() => runApp(const FlowApp());
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class FlowApp extends StatelessWidget {
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const FlowApp({super.key});
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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(appBar: AppBar(title: const Text('Flow Example')), body: const FlowMenu()),
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);
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}
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}
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class FlowMenu extends StatefulWidget {
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const FlowMenu({super.key});
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@override
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State<FlowMenu> createState() => _FlowMenuState();
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}
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class _FlowMenuState extends State<FlowMenu> with SingleTickerProviderStateMixin {
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late AnimationController menuAnimation;
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IconData lastTapped = Icons.notifications;
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final List<IconData> menuItems = <IconData>[
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Icons.home,
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Icons.new_releases,
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Icons.notifications,
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Icons.settings,
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Icons.menu,
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];
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void _updateMenu(IconData icon) {
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if (icon != Icons.menu) {
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setState(() => lastTapped = icon);
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}
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}
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@override
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void initState() {
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super.initState();
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menuAnimation = AnimationController(duration: const Duration(milliseconds: 250), vsync: this);
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}
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Widget flowMenuItem(IconData icon) {
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final double buttonDiameter = MediaQuery.of(context).size.width / menuItems.length;
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return Padding(
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padding: const EdgeInsets.symmetric(vertical: 8.0),
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child: RawMaterialButton(
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fillColor: lastTapped == icon ? Colors.amber[700] : Colors.blue,
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splashColor: Colors.amber[100],
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shape: const CircleBorder(),
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constraints: BoxConstraints.tight(Size(buttonDiameter, buttonDiameter)),
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onPressed: () {
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_updateMenu(icon);
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menuAnimation.status == AnimationStatus.completed
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? menuAnimation.reverse()
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: menuAnimation.forward();
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},
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child: Icon(icon, color: Colors.white, size: 45.0),
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),
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);
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}
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@override
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Widget build(BuildContext context) {
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return Flow(
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delegate: FlowMenuDelegate(menuAnimation: menuAnimation),
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children: menuItems.map<Widget>((IconData icon) => flowMenuItem(icon)).toList(),
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);
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}
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}
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class FlowMenuDelegate extends FlowDelegate {
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FlowMenuDelegate({required this.menuAnimation}) : super(repaint: menuAnimation);
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final Animation<double> menuAnimation;
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@override
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bool shouldRepaint(FlowMenuDelegate oldDelegate) {
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return menuAnimation != oldDelegate.menuAnimation;
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}
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@override
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void paintChildren(FlowPaintingContext context) {
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double dx = 0.0;
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for (int i = 0; i < context.childCount; ++i) {
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dx = context.getChildSize(i)!.width * i;
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context.paintChild(i, transform: Matrix4.translationValues(dx * menuAnimation.value, 0, 0));
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}
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}
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}
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