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sliver_treeview_sample.dart
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sliver_treeview_sample.dart
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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<SliverTreeViewState> _simpleTreeKey =
GlobalKey<SliverTreeViewState>();
final GlobalKey<SliverTreeViewState> _indexedTreeKey =
GlobalKey<SliverTreeViewState>();
final AutoScrollController scrollController = AutoScrollController();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: CustomScrollView(
controller: scrollController,
slivers: [
SliverToBoxAdapter(
child: Padding(
padding: const EdgeInsets.only(top: 24.0),
child: Text(
"Simple Sliver List",
style: Theme.of(context).textTheme.headlineLarge,
),
),
),
/// Simple [SliverTreeView] example
SliverTreeView.simple(
key: _simpleTreeKey,
tree: simpleTree,
scrollController: scrollController,
expansionBehavior: ExpansionBehavior.none,
builder: (context, node) => Card(
color: colorMapper[node.level.clamp(0, colorMapper.length - 1)]!,
child: ListTile(
title: Text("Simple Item ${node.level}-${node.key}"),
subtitle: Text('Level ${node.level}'),
),
),
),
SliverToBoxAdapter(
child: Padding(
padding: const EdgeInsets.only(top: 24.0),
child: Text(
"Indexed Sliver List",
style: Theme.of(context).textTheme.headlineLarge,
),
),
),
///Indexed [SliverTreeView] example
SliverTreeView.indexed(
key: _indexedTreeKey,
tree: indexedTree,
scrollController: scrollController,
expansionBehavior: ExpansionBehavior.scrollToLastChild,
builder: (context, node) => Card(
color: colorMapper[node.level.clamp(0, colorMapper.length - 1)]!,
child: ListTile(
title: Text("Indexed Item ${node.level}-${node.key}"),
subtitle: Text('Level ${node.level}'),
),
),
),
],
),
);
}
}
final simpleTree = 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"),
]);
final indexedTree = IndexedTreeNode.root()
..addAll([
IndexedTreeNode(key: "0A")..add(IndexedTreeNode(key: "0A1A")),
IndexedTreeNode(key: "0C")
..addAll([
IndexedTreeNode(key: "0C1A"),
IndexedTreeNode(key: "0C1B"),
IndexedTreeNode(key: "0C1C")
..addAll([
IndexedTreeNode(key: "0C1C2A")
..addAll([
IndexedTreeNode(key: "0C1C2A3A"),
IndexedTreeNode(key: "0C1C2A3B"),
IndexedTreeNode(key: "0C1C2A3C"),
]),
]),
]),
IndexedTreeNode(key: "0D"),
IndexedTreeNode(key: "0E"),
]);