a CupertinoSliverRefreshControl like load more sliver

Features

• support CustomerScrollView
• support autoload and preload(only if cacheExtent > 0)
• similar to CupertinoSliverRefreshControl useage
• support horizontal scroll direction

Demo

online demo

Usage

late ValueNotifier<int> _count;
Future<void> loadMore() async {
  await Future.delayed(const Duration(seconds: 1));
  _count.value = _count.value + 8;
}
CustomScrollView(slivers: [
  ValueListenableBuilder(
      valueListenable: _count,
      builder: (c, value, _) {
        return SliverList(
            ...
        ]));
      }),
  LoadMoreController(onLoad: loadMore),
]);

Additional information

CustomScrollView(
  cacheExtent: 500,
  slivers: [
    LoadMoreController(
      onLoad: loadMore,
      autoLoad: true,
    )
  ],
);

if the autoLoad argument be true:

• onLoad will be called when viewport not filled
• onLoad will be called when the LoadMoreController reach the cacheExtent of the viewport, cacheExtent can be modified to control the preloading timing