array_object_adapter

Description:

array object adapter

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