Could not implement ScrollController for load more functionality
Opened this issue · 9 comments
@santoshpro95
You need to provide a GroupedItemScrollController
Instead on an ItemScrollController. The functionality is the same.
@Dimibe Can you please give me example to implement loadMore functionality using GroupedItemScrollController. Thanks
Hi @Dimibe
I have the same question as santohpro95.
GroupedItemScrollController only has the method jumpTo and scrollTo.
@Dimibe
For standard ListView, I can assign a ScrollController
return ListView.separated( controller: _scrollController
_scrollController is a ScrollController in which I can add a listener
_scrollController.addListener(_onScroll);
Whenever it reaches the end of the list, it can load new entities
void _onScroll() {
final maxScroll = _scrollController.position.maxScrollExtent;
final currentScroll = _scrollController.position.pixels;
if (maxScroll - currentScroll <= _scrollThreshold) {
_postBloc.add(ConversationFetched());
}
}
@bezaou @santoshpro95 I think that I understand the issue now. As mentioned in the readme this package is based on the scrollable_positioned_list and not on the standard list view.
Because of that you must use the itemPositionsListener property instead of the scrollController to add listeners. For an example please have a loo at the scrollable_positioned_list package and its examples.
@bezaou did you find any way how to implement 'load more' feature for this kind of list?
I currently stopped working on the project, but the following used to work as far as I remember, please test it on your own.
final ItemPositionsListener _itemPositionsListener = ItemPositionsListener.create();
[...]
_itemPositionsListener.itemPositions.addListener(() {
//print('test' + _itemPositionsListener.itemPositions.value.last.itemTrailingEdge.toString());
if (_itemPositionsListener.itemPositions.value.last.itemTrailingEdge < 1) {
// print("bottom?" +
// _itemPositionsListener.itemPositions.value.last.itemTrailingEdge.toString() +
// ' ---- > ' +
// _itemPositionsListener.itemPositions.value.last.index.toString());
if (_itemPositionsListener.itemPositions.value.last.index > 1) {
//print('fetch');
_homeBloc.add(HomeEventsFetched());
}
}
});
[...]
return StickyGroupedListView<EventSearchResource, DateTime>(
[...]
itemScrollController: GroupedItemScrollController(),
itemPositionsListener: _itemPositionsListener,
);
}