Add helper method to show file ownership split

lib/models/selected_file_breakup.dart

@@ -0,0 +1,16 @@
+import 'package:photos/models/file.dart';
+
+class SelectedFileSplit {
+  final List<File> pendingUploads;
+  final List<File> ownedByCurrentUser;
+  final List<File> ownedByOtherUsers;
+
+  SelectedFileSplit({
+    required this.pendingUploads,
+    required this.ownedByCurrentUser,
+    required this.ownedByOtherUsers,
+  });
+
+  int get totalFileOwnedCount =>
+      pendingUploads.length + ownedByCurrentUser.length;
+}

lib/models/selected_files.dart

@@ -3,6 +3,7 @@ import 'package:flutter/foundation.dart';
 import 'package:photos/core/event_bus.dart';
 import 'package:photos/events/clear_selections_event.dart';
 import 'package:photos/models/file.dart';
+import 'package:photos/models/selected_file_breakup.dart';
 
 class SelectedFiles extends ChangeNotifier {
   final files = <File>{};
@@ -52,6 +53,26 @@ class SelectedFiles extends ChangeNotifier {
     return matchedFile != null;
   }
 
+  SelectedFileSplit split(int currentUseID) {
+    final List<File> ownedByCurrentUser = [],
+        ownedByOtherUsers = [],
+        pendingUploads = [];
+    for (var f in files) {
+      if (f.ownerID == null || f.uploadedFileID == null) {
+        pendingUploads.add(f);
+      } else if (f.ownerID == currentUseID) {
+        ownedByCurrentUser.add(f);
+      } else {
+        ownedByOtherUsers.add(f);
+      }
+    }
+    return SelectedFileSplit(
+      pendingUploads: pendingUploads,
+      ownedByCurrentUser: ownedByCurrentUser,
+      ownedByOtherUsers: ownedByOtherUsers,
+    );
+  }
+
   void clearAll() {
     Bus.instance.fire(ClearSelectionsEvent());
     lastSelections.addAll(files);