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lib/components/DownloadsScreen/album_file_size.dart

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+import 'package:file_sizes/file_sizes.dart';
+import 'package:flutter/material.dart';
+import 'package:get_it/get_it.dart';
+
+import '../../models/finamp_models.dart';
+import '../../services/downloads_helper.dart';
+
+class AlbumFileSize extends StatelessWidget {
+  const AlbumFileSize({Key? key, required this.downloadedParent})
+      : super(key: key);
+
+  final DownloadedParent downloadedParent;
+
+  @override
+  Widget build(BuildContext context) {
+    DownloadsHelper downloadsHelper = GetIt.instance<DownloadsHelper>();
+    int totalSize = 0;
+
+    for (final item in downloadedParent.downloadedChildren.values) {
+      DownloadedSong? downloadedSong =
+          downloadsHelper.getDownloadedSong(item.id);
+
+      if (downloadedSong?.mediaSourceInfo.size != null) {
+        totalSize += downloadedSong!.mediaSourceInfo.size!;
+      }
+    }
+
+    return Text(FileSize.getSize(totalSize));
+  }
+}