PagewiseLoadController<T> class

The controller responsible for managing page loading in Pagewise

You don't have to provide a controller yourself when creating a Pagewise widget. The widget will create one for you. However you might wish to create one yourself in order to achieve some effects.

Notice though that if you provide a controller yourself, you should provide the pageFuture and pageSize parameters to the controller instead of the widget.

A possible use case of the controller is to force a reset of the loaded pages using a RefreshIndicator. you could achieve that as follows:

final _pageLoadController = PagewiseLoadController(
  pageSize: 6,
  pageFuture: BackendService.getPage
);

@override
Widget build(BuildContext context) {
  return RefreshIndicator(
    onRefresh: () async {
      await this._pageLoadController.reset();
    },
    child: PagewiseListView(
        itemBuilder: this._itemBuilder,
        pageLoadController: this._pageLoadController,
    ),
  );
}

Another use case for creating the controller yourself is if you want to listen to the state of Pagewise and act accordingly. For example, you might want to show a specific widget when the list is empty In that case, you could do:

final _pageLoadController = PagewiseLoadController(
  pageSize: 6,
  pageFuture: BackendService.getPage
);

bool _empty = false;

@override
void initState() {
  super.initState();

  this._pageLoadController.addListener(() {
    if (this._pageLoadController.noItemsFound) {
      setState(() {
        this._empty = this._pageLoadController.noItemsFound;
      });
    }
  });
}

And then in your build function you do:

if (this._empty) {
  return Text('NO ITEMS FOUND');
}