assetsGridItemCount method

@override int assetsGridItemCount({ required BuildContext context, required List<AssetEntity> assets, int placeholderCount = 0, Widget? specialItem, })

The function which return items count for the assets' grid. 为资源列表提供内容数量计算的方法

Implementation

@override
int assetsGridItemCount({
  required BuildContext context,
  required List<AssetEntity> assets,
  int placeholderCount = 0,
  Widget? specialItem,
}) {
  final PathWrapper<AssetPathEntity>? currentWrapper = context
      .select<DefaultAssetPickerProvider, PathWrapper<AssetPathEntity>?>(
    (DefaultAssetPickerProvider p) => p.currentPath,
  );
  final AssetPathEntity? currentPathEntity = currentWrapper?.path;
  final int length = assets.length + placeholderCount;

  // Return 1 if the [specialItem] build something.
  if (currentPathEntity == null && specialItem != null) {
    return placeholderCount + 1;
  }

  // Return actual length if the current path is all.
  // 如果当前目录是全部内容，则返回实际的内容数量。
  if (currentPathEntity?.isAll != true && specialItem == null) {
    return length;
  }
  return switch (specialItemPosition) {
    SpecialItemPosition.none => length,
    SpecialItemPosition.prepend || SpecialItemPosition.append => length + 1,
  };
}