assetsGridItemCount method

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

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 AssetPathEntity? currentPathEntity =
      context.select<DefaultAssetPickerProvider, AssetPathEntity?>(
    (DefaultAssetPickerProvider p) => p.currentPath,
  );
  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) {
    return length;
  }
  switch (specialItemPosition) {
    case SpecialItemPosition.none:
      return length;
    case SpecialItemPosition.prepend:
    case SpecialItemPosition.append:
      return length + 1;
  }
}