/
main.dart
115 lines (107 loc) · 2.96 KB
/
main.dart
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import 'package:flutter/material.dart';
import 'package:nested_reorderable_list/nested_reorderable_list.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Nested Reorderable List Demo',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(
seedColor: Colors.deepPurple,
),
useMaterial3: true,
),
home: const MyHomePage(title: 'Nested Reorderable List Demo'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({super.key, required this.title});
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
List<DragAndDropItem<String>> items = [
DragAndDropItem<String>(
key: 'Item 1',
content: 'Item 1',
children: [
DragAndDropItem<String>(
key: 'Item 1.1',
content: 'Item 1.1',
),
DragAndDropItem<String>(
key: 'Item 1.2',
content: 'Item 1.2',
),
],
),
DragAndDropItem<String>(
key: 'Item 2',
content: 'Item 2',
children: [
DragAndDropItem<String>(
key: 'Item 2.1',
content: 'Item 2.1',
),
DragAndDropItem<String>(
key: 'Item 2.2',
content: 'Item 2.2',
),
],
),
DragAndDropItem<String>(
key: 'Item 3',
content: 'Item 3',
children: [
DragAndDropItem<String>(
key: 'Item 3.1',
content: 'Item 3.1',
),
DragAndDropItem<String>(
key: 'Item 3.2',
content: 'Item 3.2',
),
],
),
];
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
title: Text(widget.title),
),
body: SingleChildScrollView(
child: NestedReorderableList(
dragAndDropItems: items,
itemBuilder: (context, item) => ListTile(
key: Key(item.key),
title: Text(item.content),
),
onReorder: (source, destination, _) {
setState(() {
// Determine source and destination lists
final sourceList = (source.parentIndex == null)
? items
: items[source.parentIndex!].children;
final destList = (destination.parentIndex == null)
? items
: items[destination.parentIndex!].children;
// Perform removal and insertion
final moved = sourceList.removeAt(source.index);
final destinationIndex = destination.index;
destList.insert(destinationIndex, moved);
});
},
),
),
);
}
}