nested_reorderable_list

Description:

nested reorderable list

nested_reorderable_list #
A Flutter package that provides a widget to create a nested reorderable list.

Getting Started #
This package provides a stateless widget, NestedReorderableList, which allows you to create a list with drag-and-drop item reordering functionality. This widget supports nested lists, meaning that list items can have their own children, which can also be reordered.
Usage #
First, you'll need to add nested_reorderable_list to your pubspec.yaml:
dependencies:
flutter:
sdk: flutter

nested_reorderable_list: ^0.0.1
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Then, import the package in your Dart file:
import 'package:nested_reorderable_list/nested_reorderable_list.dart';
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Here's a basic example of how to use the NestedReorderableList widget:
NestedReorderableList<String>(
dragAndDropItems: items,
itemBuilder: (BuildContext context, DragAndDropItem<String> item) => Text(item.content),
onReorder: (SourceLocation source, DestinationLocation destination, DragAndDropItem<String> movedItem) {
setState(() {
// Determine the source and destination lists based on whether the parentIndex is null
final sourceList = (source.parentIndex == null)
? items
: items[source.parentIndex!].children;
final destList = (destination.parentIndex == null)
? items
: items[destination.parentIndex!].children;

// Perform the removal and insertion operation
final moved = sourceList.removeAt(source.index);
final destinationIndex = destination.index;
destList.insert(destinationIndex, moved);
});
},
);
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In the example above, items is a list of DragAndDropItem instances, each of which contains a key for identification, the content of the item, and a list of child DragAndDropItem instances (if any). The itemBuilder is a function that takes a BuildContext and a DragAndDropItem and returns a Widget that represents the item. The onReorder function is called when a drag-and-drop operation finishes; it receives a SourceLocation and a DestinationLocation, which represent the initial and final locations of the dragged item, respectively.
License #
This project is licensed under the MIT License - see the LICENSE file for details.