# drag\_and\_drop\_lists Two-level drag and drop reorderable lists. ## Features - Reorder elements between multiple lists - Reorder lists - Drag and drop new elements from outside of the lists - Vertical or horizontal layout - Use with drag handles, long presses, or short presses - Expandable lists - Can be used in slivers - Prevent individual lists/elements from being able to be dragged - Easy to extend with custom layouts

Basic Expansion Tiles Drag Handle Drag Into Lists Horizontal List Tiles Slivers

## Known Issues There is currently (as of flutter v. 1.24.0-1.0.pre) an issue only on web where dragging an item with some descendant that includes an InkWell widget with an onTap method will throw an exception. This includes having a ListTile with an onTap method defined. This seems to be resolved by using a GestureDetector and its onTap method instead of the InkWell. See the following issues: * [#14](https://github.com/philip-brink/DragAndDropLists/issues/14) * [Flutter #69774](https://github.com/flutter/flutter/issues/69774) * [Flutter #67044](https://github.com/flutter/flutter/issues/67044) * [Flutter #66887](https://github.com/flutter/flutter/issues/66887) ## Usage To use this plugin, add `drag_and_drop_lists` as a [dependency in your pubspec.yaml file.](https://flutter.dev/docs/development/packages-and-plugins/using-packages) For example: ``` dependencies: drag_and_drop_lists: ^0.2.1 ``` Now in your Dart code, you can use: `import 'package:drag_and_drop_lists/drag_and_drop_lists.dart';` To add the lists, add a `DragAndDropLists` widget. Set its children to a list of `DragAndDropList`. Likewise, set the children of `DragAndDropList` to a list of `DragAndDropItem`. For example: ``` // Outer list List _contents; @override void initState() { super.initState(); // Generate a list _contents = List.generate(10, (index) { return DragAndDropList( header: Text('Header $index'), children: [ DragAndDropItem( child: Text('$index.1'), ), DragAndDropItem( child: Text('$index.2'), ), DragAndDropItem( child: Text('$index.3'), ), ], ); }); } @override Widget build(BuildContext context) { // Add a DragAndDropLists. The only required parameters are children, // onItemReorder, and onListReorder. All other parameters are used for // styling the lists and changing its behaviour. See the samples in the // example app for many more ways to configure this. return DragAndDropLists( children: _contents, onItemReorder: _onItemReorder, onListReorder: _onListReorder, ); } _onItemReorder(int oldItemIndex, int oldListIndex, int newItemIndex, int newListIndex) { setState(() { var movedItem = _contents[oldListIndex].children.removeAt(oldItemIndex); _contents[newListIndex].children.insert(newItemIndex, movedItem); }); } _onListReorder(int oldListIndex, int newListIndex) { setState(() { var movedList = _contents.removeAt(oldListIndex); _contents.insert(newListIndex, movedList); }); } ``` For further examples, see the example app or [view the example code](https://github.com/philip-brink/DragAndDropLists/tree/master/example/lib) directly.

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