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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>
94 lines
2.8 KiB
Dart
94 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 [TreeSliver].
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void main() => runApp(const TreeSliverExampleApp());
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class TreeSliverExampleApp extends StatelessWidget {
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const TreeSliverExampleApp({super.key});
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@override
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Widget build(BuildContext context) {
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return const MaterialApp(home: TreeSliverExample());
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}
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}
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class TreeSliverExample extends StatefulWidget {
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const TreeSliverExample({super.key});
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@override
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State<TreeSliverExample> createState() => _TreeSliverExampleState();
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}
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class _TreeSliverExampleState extends State<TreeSliverExample> {
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TreeSliverNode<String>? _selectedNode;
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final TreeSliverController controller = TreeSliverController();
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final List<TreeSliverNode<String>> _tree = <TreeSliverNode<String>>[
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TreeSliverNode<String>('First'),
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TreeSliverNode<String>(
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'Second',
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children: <TreeSliverNode<String>>[
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TreeSliverNode<String>(
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'alpha',
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children: <TreeSliverNode<String>>[
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TreeSliverNode<String>('uno'),
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TreeSliverNode<String>('dos'),
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TreeSliverNode<String>('tres'),
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],
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),
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TreeSliverNode<String>('beta'),
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TreeSliverNode<String>('kappa'),
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],
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),
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TreeSliverNode<String>(
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'Third',
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expanded: true,
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children: <TreeSliverNode<String>>[
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TreeSliverNode<String>('gamma'),
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TreeSliverNode<String>('delta'),
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TreeSliverNode<String>('epsilon'),
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],
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),
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TreeSliverNode<String>('Fourth'),
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];
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(title: const Text('TreeSliver Demo')),
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body: CustomScrollView(
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slivers: <Widget>[
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TreeSliver<String>(
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tree: _tree,
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controller: controller,
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treeNodeBuilder: (
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BuildContext context,
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TreeSliverNode<Object?> node,
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AnimationStyle animationStyle,
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) {
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Widget child = GestureDetector(
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behavior: HitTestBehavior.translucent,
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onTap: () {
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setState(() {
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controller.toggleNode(node);
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_selectedNode = node as TreeSliverNode<String>;
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});
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},
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child: TreeSliver.defaultTreeNodeBuilder(context, node, animationStyle),
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);
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if (_selectedNode == node as TreeSliverNode<String>) {
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child = ColoredBox(color: Colors.purple[100]!, child: child);
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}
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return child;
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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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}
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