hilbert2048/reorderable_grid

A Flutter inplementation of the reorderable grid UI pattern, closely mimics Flutters exisiting ReorderableList

🔳 Reorderable Grid

A full reorderable grid implemention similar to Flutters Reorderable_List. with full ReorderableGridView, ReorderableGrid and SliverReorderableGrid implementations

🔨 How it works

ReorderableGridView is a drop in replacement for the existing GridView and adds an onReorder callback that provides the original and new index of the reordered item.

/// create a new list of data
final items = List<int>.generate(40, (index) => index);

/// when the reorder completes remove the list entry from its old position
/// and insert it at its new index
void _onReorder(int oldIndex, int newIndex) {
setState(() {
    final item = items.removeAt(oldIndex);
    items.insert(newIndex, item);
});
}

@override
Widget build(BuildContext context) {
return MaterialApp(
    home: Scaffold(
      body: ReorderableGridView.extent(
        maxCrossAxisExtent: 250,
        onReorder: _onReorder,
        childAspectRatio: 1,
        children: items.map((item) {
          /// map every list entry to a widget and assure every child has a 
          /// unique key
          return Card(
            key: ValueKey(item),
            child: Center(
            child: Text(item.toString()),
            ),
          );
        }).toList(),
      ),
    ),
);
}

ReorderableGrid provides all the constructors and parameters the normal GridView has. The package also includes:

• ReorderableGridView, which is a prebuild Material-ish implementation of the grid.
• ReorderableGrid, A barebones widget that allows you to customize the grid however you want
• SliverReorderableGrid, a reorderable grid sliver for custom scroll implementations

👋 Get Involved

If this package is useful to you please 👍 on pub.dev and ⭐ on github. If you have any Issues, recommendations or pull requests I'd love to see them!