lazyLoading.dart

SliverGrid(
  gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
    // this needs to work with the control, should be able to get the size of the display we are on, not the whole device.
    crossAxisCount: ((MediaQuery.of(context).size.width > 540 ? 540 : MediaQuery.of(context).size.width) / 200).round(),
  ),
  delegate: SliverChildBuilderDelegate((BuildContext context, int index) {
      return CastTile(castMember: currentCast[index]);
    },
    childCount: currentCast == null ? 0 : currentCast.length,
  ),
),


// in CastTile() here is how I handle the lazy loading of the cast images

Container(
  height: 100,
  width: 100,
  decoration: BoxDecoration(
    borderRadius: BorderRadius.circular(10.0),
    image: DecorationImage(
      image: usePlaceholder ? AssetImage('assets/castplaceholder.png') : NetworkImage('https://image.tmdb.org/t/p/w500/' + castMember['profile_path']),
      fit: BoxFit.cover,
    ),
    boxShadow: [
      BoxShadow(
        color: Colors.black,
        blurRadius: 20.0,
        offset: Offset(0.0, 10.0),
      )
    ],
  ),
),