A section list view for flutter

List<GroupModel> data = [
    GroupModel(name: "Group 1", items: [
      ItemModel(name: "Item 1-1"),
      ItemModel(name: "Item 1-2"),
      ItemModel(name: "Item 1-3"),
      ItemModel(name: "Item 1-4"),
      ItemModel(name: "Item 1-5"),
    ]),
    GroupModel(name: "Group 2", items: [
      ItemModel(name: "Item 2-1"),
      ItemModel(name: "Item 2-2"),
      ItemModel(name: "Item 2-3"),
      ItemModel(name: "Item 2-4"),
      ItemModel(name: "Item 2-5"),
    ]),
    GroupModel(name: "Group 3", items: [
      ItemModel(name: "Item 3-1"),
      ItemModel(name: "Item 3-2"),
      ItemModel(name: "Item 3-3"),
      ItemModel(name: "Item 3-4"),
      ItemModel(name: "Item 3-5"),
    ]),
  ];

SectionView<GroupModel, ItemModel>(
  source: data,
  onFetchListData: (header) => header.items,
  headerBuilder: getDefaultHeaderBuilder((d) => d.name,
      bkColor: Colors.green,
      style:
          const TextStyle(fontSize: 18, color: Colors.white)),
  itemBuilder:
      (context, itemData, itemIndex, headerData, headerIndex) =>
          ListTile(
            title: Text(itemData.name),
          )),