Provide option to download multiple items

mobile/lib/ui/viewer/actions/file_selection_actions_widget.dart

@@ -3,6 +3,7 @@ import "dart:async";
 import 'package:fast_base58/fast_base58.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import "package:logging/logging.dart";
 import "package:modal_bottom_sheet/modal_bottom_sheet.dart";
 import 'package:photos/core/configuration.dart';
 import "package:photos/generated/l10n.dart";
@@ -30,6 +31,8 @@ import 'package:photos/ui/sharing/manage_links_widget.dart';
 import "package:photos/ui/tools/collage/collage_creator_page.dart";
 import "package:photos/ui/viewer/location/update_location_data_widget.dart";
 import 'package:photos/utils/delete_file_util.dart';
+import "package:photos/utils/dialog_util.dart";
+import "package:photos/utils/file_download_util.dart";
 import 'package:photos/utils/magic_util.dart';
 import 'package:photos/utils/navigation_util.dart';
 import "package:photos/utils/share_util.dart";
@@ -56,6 +59,7 @@ class FileSelectionActionsWidget extends StatefulWidget {
 
 class _FileSelectionActionsWidgetState
     extends State<FileSelectionActionsWidget> {
+  static final _logger = Logger("FileSelectionActionsWidget");
   late int currentUserID;
   late FilesSplit split;
   late CollectionActions collectionActions;
@@ -115,6 +119,8 @@ class _FileSelectionActionsWidgetState
         !widget.selectedFiles.files.any(
           (element) => element.fileType == FileType.video,
         );
+    final showDownloadOption =
+        widget.selectedFiles.files.any((element) => element.localID == null);
 
     //To animate adding and removing of [SelectedActionButton], add all items
     //and set [shouldShow] to false for items that should not be shown and true
@@ -367,6 +373,16 @@ class _FileSelectionActionsWidgetState
       );
     }
 
+    if (showDownloadOption) {
+      items.add(
+        SelectionActionButton(
+          labelText: S.of(context).download,
+          icon: Icons.cloud_download_outlined,
+          onTap: () => _download(widget.selectedFiles.files.toList()),
+        ),
+      );
+    }
+
     items.add(
       SelectionActionButton(
         labelText: S.of(context).share,
@@ -642,4 +658,29 @@ class _FileSelectionActionsWidgetState
       widget.selectedFiles.clearAll();
     }
   }
+
+  Future<void> _download(List<EnteFile> files) async {
+    final dialog = createProgressDialog(
+      context,
+      S.of(context).downloading,
+      isDismissible: true,
+    );
+    await dialog.show();
+    try {
+      final futures = <Future>[];
+      for (final file in files) {
+        if (file.localID == null) {
+          futures.add(downloadToGallery(file));
+        }
+      }
+      await Future.wait(futures);
+      await dialog.hide();
+      widget.selectedFiles.clearAll();
+      showToast(context, S.of(context).filesSavedToGallery);
+    } catch (e) {
+      _logger.warning("Failed to save files", e);
+      await dialog.hide();
+      await showGenericErrorDialog(context: context, error: e);
+    }
+  }
 }