Source Code added

mobile/lib/providers/image/immich_remote_thumbnail_provider.dart

@@ -0,0 +1,61 @@
+import 'dart:async';
+import 'dart:ui' as ui;
+
+import 'package:cached_network_image/cached_network_image.dart';
+import 'package:flutter_cache_manager/flutter_cache_manager.dart';
+import 'package:immich_mobile/providers/image/cache/image_loader.dart';
+import 'package:immich_mobile/providers/image/cache/thumbnail_image_cache_manager.dart';
+import 'package:openapi/api.dart' as api;
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/painting.dart';
+import 'package:immich_mobile/entities/asset.entity.dart';
+import 'package:immich_mobile/utils/image_url_builder.dart';
+
+/// The remote image provider
+class ImmichRemoteThumbnailProvider extends ImageProvider<ImmichRemoteThumbnailProvider> {
+  /// The [Asset.remoteId] of the asset to fetch
+  final String assetId;
+
+  final int? height;
+  final int? width;
+
+  /// The image cache manager
+  final CacheManager? cacheManager;
+
+  const ImmichRemoteThumbnailProvider({required this.assetId, this.height, this.width, this.cacheManager});
+
+  /// Converts an [ImageProvider]'s settings plus an [ImageConfiguration] to a key
+  /// that describes the precise image to load.
+  @override
+  Future<ImmichRemoteThumbnailProvider> obtainKey(ImageConfiguration configuration) {
+    return SynchronousFuture(this);
+  }
+
+  @override
+  ImageStreamCompleter loadImage(ImmichRemoteThumbnailProvider key, ImageDecoderCallback decode) {
+    final cache = cacheManager ?? ThumbnailImageCacheManager();
+    return MultiImageStreamCompleter(codec: _codec(key, cache, decode), scale: 1.0);
+  }
+
+  // Streams in each stage of the image as we ask for it
+  Stream<ui.Codec> _codec(ImmichRemoteThumbnailProvider key, CacheManager cache, ImageDecoderCallback decode) async* {
+    // Load a preview to the chunk events
+    final preview = getThumbnailUrlForRemoteId(key.assetId, type: api.AssetMediaSize.thumbnail);
+
+    yield await ImageLoader.loadImageFromCache(preview, cache: cache, decode: decode);
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+    if (other is ImmichRemoteThumbnailProvider) {
+      return assetId == other.assetId;
+    }
+
+    return false;
+  }
+
+  @override
+  int get hashCode => assetId.hashCode;
+}