size_aware_image_provider.dart

class SizeAwareImageCacheKey {
  const SizeAwareImageCacheKey(this._providerCacheKey, this._imageSize);

  final dynamic _providerCacheKey;
  final Size _imageSize;
}

class SizeAwareImageProvicer
    extends ImageProvider<SizeAwareImageCacheKey> {
  const SizeAwareImageProvicer(this._imageProvider, this.imageSize);

  final ImageProvider _imageProvider;
  final Size imageSize;

  @override
  ImageStreamCompleter load(SizeAwareImageCacheKey key) {
    return _imageProvider.load(key._providerCacheKey, size: key._imageSize);
  }

  @override
  Future<SizeAwareImageCacheKey> obtainKey(
      ImageConfiguration configuration) async {
    final dynamic providerCacheKey = _imageProvider.obtainKey(configuration);
    return SizeAwareImageCacheKey(providerCacheKey, imageSize);
  }
}