A small library support load infinite for ListView - GridView on Flutter.

Overview

Paging

A Flutter package that supports pagination(load infinite) for ListView, GridView

Demo

DataSource

PageKeyedDataSource

To create a PagingListView or PagingGridView you will need create class which extended from PageKeyedDataSource.

When extended from PageKeyedDataSource, you will need override 2 methods is loadInitial and loadPageAfter.

Output of those function is a Tuple2 with item1 is List is List of data, end item2 is next page index.

Example: if your list start with page index is 0. -> on loadInitial output is Tuple2([...], 1) 1 is next page when load more item.

Example:

class ListViewDataSource extends paging.PageKeyedDataSource<int, Note> {
  NoteRepository noteRepository;

  ListViewDataSource(this.noteRepository);

  @override
  Future<Tuple2<List<Note>, int>> loadInitial(int pageSize) async {
    return Tuple2(await noteRepository.getNotes(0), 1);
  }

  @override
  Future<Tuple2<List<Note>, int>> loadPageAfter(int params, int pageSize) async {
    return Tuple2(await noteRepository.getNotes(params), params + 1);
  }
}

Display on UI

To display on UI, currently you can use PagingListView or PagingGridView.

Example:

      ListViewDataSource dataSource = ListViewDataSource(NoteRepository());

      PagingListView<Note>(
        itemBuilder: (context, data, child) => NoteWidget(data),
        pageDataSource: dataSource,
      ),

Comments

Add empty, loading, error builder for gridview, public gridview state
Add empty, loading, error builder for grid view (Currently, grid view show red screen when data is empty)

Public grid view state for further control
opened by tronghuy5555 0

Retry function work incorrectly if the list is empty

  Future<List<D>> loadPage({bool isRefresh = false}) async {
    if ((currentKey == null) || isRefresh) {
      if (_cancelableOperation != null && !_cancelableOperation!.isCompleted)
        _cancelableOperation!.cancel();
      _cancelableOperation = CancelableOperation.fromFuture(loadInitial(pageSize));
      final results = await _cancelableOperation!.valueOrCancellation();
      if (autoDetectEndList) {
        isEndList = ((results?.item1.length ?? 0) < pageSize);
      }
      currentKey = results?.item2;
      return results?.item1 ?? [];
    } else {
      _cancelableOperation =  CancelableOperation.fromFuture(loadPageAfter(currentKey!, pageSize));
      final results = await _cancelableOperation!.valueOrCancellation();
      currentKey = results?.item2;
      if (autoDetectEndList) {
        isEndList = ((results?.item1.length ?? 0) < pageSize);
      }
      return results?.item1 ?? [];
    }
  }
Step: Empty list -> call retry function
Expect: loadInitial called
Actual: loadPageAfter called

opened by tronghuy5555 0

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A small library support load infinite for ListView - GridView on Flutter.

Related tags

Overview

Paging

Demo

DataSource

PageKeyedDataSource

Display on UI

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Comments

Add empty, loading, error builder for gridview, public gridview state

Retry function work incorrectly if the list is empty

Owner

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