movie_page.dart

Widget _buildBody(StreamData<List<ContentData>> streamData){
  return Stack(
    children: [
      ListView.builder(
        itemCount: streamData.data.length,
        itemBuilder: (context, index) {
          final item = streamData.data[index];
          return CardItem(
            onTap: () => _onCardTap(context, item),
            content: item,
            width: size.width,
          );
        },
      ),
      if(streamData is LoadingData)
        Align(
          alignment: Alignment.center,
          child: CircularProgressIndicator(),
        ),
    ],
  );
}