Source Code added

mobile/lib/providers/asset_viewer/asset_stack.provider.dart

@@ -0,0 +1,42 @@
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/entities/asset.entity.dart';
+import 'package:immich_mobile/services/asset.service.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'asset_stack.provider.g.dart';
+
+class AssetStackNotifier extends StateNotifier<List<Asset>> {
+  final AssetService assetService;
+  final String _stackId;
+
+  AssetStackNotifier(this.assetService, this._stackId) : super([]) {
+    _fetchStack(_stackId);
+  }
+
+  void _fetchStack(String stackId) async {
+    if (!mounted) {
+      return;
+    }
+
+    final stack = await assetService.getStackAssets(stackId);
+    if (stack.isNotEmpty) {
+      state = stack;
+    }
+  }
+
+  void removeChild(int index) {
+    if (index < state.length) {
+      state.removeAt(index);
+      state = List<Asset>.from(state);
+    }
+  }
+}
+
+final assetStackStateProvider = StateNotifierProvider.autoDispose.family<AssetStackNotifier, List<Asset>, String>(
+  (ref, stackId) => AssetStackNotifier(ref.watch(assetServiceProvider), stackId),
+);
+
+@riverpod
+int assetStackIndex(Ref _) {
+  return -1;
+}