animated_tree_view 1.1.1

Animated TreeView based on AnimatedList that allows building fully customizable Nodes that can be nested to infinite levels and children.

example/lib/main.dart

import 'package:animated_tree_view/animated_tree_view.dart';
import 'package:flutter/material.dart';

import '../utils/utils.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Simple Animated Tree Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Simple Animated Tree Demo'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final GlobalKey<TreeViewState> _treeKey = GlobalKey<TreeViewState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: TreeView.simple(
        key: _treeKey,
        tree: sampleTree,
        expansionIndicator: ExpansionIndicator.RightUpChevron,
        onItemTap: (item) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(
              content: Text("Item tapped: ${item.key}"),
              duration: const Duration(milliseconds: 750),
            ),
          );
        },
        builder: (context, level, item) => Card(
          color: colorMapper[level.clamp(0, colorMapper.length - 1)]!,
          child: ListTile(
            title: Text("Item ${item.level}-${item.key}"),
            subtitle: Text('Level $level'),
          ),
        ),
      ),
    );
  }
}

final sampleTree = TreeNode.root()
  ..addAll([
    TreeNode(key: "0A")..add(TreeNode(key: "0A1A")),
    TreeNode(key: "0C")
      ..addAll([
        TreeNode(key: "0C1A"),
        TreeNode(key: "0C1B"),
        TreeNode(key: "0C1C")
          ..addAll([
            TreeNode(key: "0C1C2A")
              ..addAll([
                TreeNode(key: "0C1C2A3A"),
                TreeNode(key: "0C1C2A3B"),
                TreeNode(key: "0C1C2A3C"),
              ]),
          ]),
      ]),
    TreeNode(key: "0D"),
    TreeNode(key: "0E"),
  ]);