mi-sch-ka/array-object-adapter

Adapter that is similar to the ObjectAdapter (ArrayObjectAdapter) from the Android Leanback support library.

Adapter that is similar to the ObjectAdapter (ArrayObjectAdapter) from the Android Leanback support library.

Example Project

There is a pretty sweet example project in the example folder. Check it out. Otherwise, keep reading to get up and running.

Adapter

An array-based data source that provides access to a data model and is decoupled from the presentation of the items via Presenter/PresenterSelector. As the adapter implements the dart stream interface, you can simply observe the data set.

adapter.listen((_) { 
    // data set changed
});

@override
  Widget build(BuildContext context) {
    return StreamBuilder(
      stream: _adapter,
      builder: (context, snapshot) {},);
  } 

Presenter

Split presenter logic from adapter logic. Presenter that will create Views/Widgets and bind object.

/// A simple example where a string is represented as a text widget.
/// But imagine for example a user object, which is represented with a thumbnail, name and address etc.
class TextPresenter extends Presenter {
  
  @override
  Widget createView(BuildContext context, Object item) {
    final value = item as String;
    return Text(value);
  }
}

To use multiple viewTypes use PresenterSelector.

final classPresenterSelector = ClassPresenterSelector()
      ..addClassPresenter(int, IntPresenter())
      ..addClassPresenter(String, TextPresenter());

final adapter = ArrayObjectAdapter(presenterSelector: classPresenterSelector);

final items = <dynamic>[];
// create your content
...

adapter.setItems(items);

Attach an adapter for the data to displayed to your view

@override
  Widget build(BuildContext context) {
    return ListView.separated(
      itemCount: adapter.itemCount(),
      itemBuilder: (BuildContext context, int index) {
        final item = adapter.get(index);
        final presenter = adapter.getPresenter(item);
        return presenter.createView(context, item);
      },
      separatorBuilder: (BuildContext context, int index) => Divider(),
    );
  }

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