assetsGridItemCount method

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

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,
}) {
  final AssetPathEntity? currentPathEntity =
      context.select<DefaultAssetPickerProvider, AssetPathEntity?>(
    (DefaultAssetPickerProvider p) => p.currentPathEntity,
  );

  if (currentPathEntity == null &&
      specialItemPosition != SpecialItemPosition.none) {
    return 1;
  }

  /// Return actual length if 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。
  final int _length = assets.length + placeholderCount;
  if (!currentPathEntity!.isAll) {
    return _length;
  }
  switch (specialItemPosition) {
    case SpecialItemPosition.none:
      return _length;
    case SpecialItemPosition.prepend:
    case SpecialItemPosition.append:
      return _length + 1;
  }
}