isolate and export resilient snack bar

CHANGELOG.md

@@ -16,6 +16,8 @@ The package is available from
 
 ## 1.1 Consolidate Android Login
 
++ Export resilient snackbar [1.0.47 20260917 jesscmoore]
++ Overflow menu in More button on mobile nav bar [1.0.46 20260915 jesscmoore]
 + Add internet connection retries [1.0.48 20260916 jesscmoore]
 + Overflow menu in More button on mobile nav bar [1.0.47 20260915 jesscmoore]
 + Plainer wording when a sign-in does not complete [1.0.46 20260918 gjw]

lib/solidui.dart

@@ -111,6 +111,8 @@ export 'src/services/solid_backup_service.dart';
 export 'src/widgets/solid_backup_dialog.dart';
 
 export 'src/utils/snack_bar.dart';
+export 'src/utils/resilient_snack_bar.dart';
+export 'src/constants/ui_colors.dart';
 
 export 'src/widgets/solid_file.dart';
 export 'src/widgets/solid_file_browser.dart';

lib/src/utils/resilient_snack_bar.dart

@@ -0,0 +1,78 @@
+/// A [SnackBar] reporter that survives a momentarily-unregistered Scaffold.
+///
+/// Copyright (C) 2024-2026, Software Innovation Institute, ANU.
+///
+/// Licensed under the MIT License (the "License").
+///
+/// License: https://choosealicense.com/licenses/mit/.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+///
+/// Authors: Jess Moore, Anushka Vidanage
+
+library;
+
+import 'package:flutter/material.dart';
+
+/// Signature for the snack-bar reporter used to surface an async action's
+/// outcome back to the caller's UI.
+
+typedef NotifySnackBar = void Function(
+  String message,
+  Color backgroundColor, {
+  Duration duration,
+});
+
+/// Build a resilient [NotifySnackBar] bound to [messenger].
+///
+/// Showing a SnackBar requires a Scaffold registered with the messenger.
+/// Depending on how the host embeds the form, and on the exact moment the
+/// dialog is dismissed, the messenger can momentarily have no Scaffold,
+/// which throws the "_scaffolds.isNotEmpty" assertion. A confirmation toast
+/// is non-critical (the underlying action has already succeeded or failed
+/// independently of this call), so the call is guarded and retried once on
+/// the next frame rather than ever letting it crash the app.
+///
+/// Capture the closure returned here *before* any `await` in the caller, so
+/// it keeps working even if the calling widget is unmounted mid-flow (e.g. a
+/// purchase or permission-grant result that resolves after the dialog that
+/// started it has already closed).
+
+NotifySnackBar makeResilientSnackBar(ScaffoldMessengerState messenger) => (
+      String message,
+      Color backgroundColor, {
+      Duration duration = const Duration(seconds: 4),
+    }) {
+      SnackBar build() => SnackBar(
+            content: Text(message),
+            backgroundColor: backgroundColor,
+            duration: duration,
+          );
+      try {
+        messenger.showSnackBar(build());
+      } on Object catch (_) {
+        WidgetsBinding.instance.addPostFrameCallback((_) {
+          try {
+            messenger.showSnackBar(build());
+          } on Object catch (e) {
+            debugPrint('Could not show snackbar "$message": $e');
+          }
+        });
+      }
+    };

lib/src/widgets/grant_permission_notify.dart

@@ -36,48 +36,12 @@ import 'package:solidpod/solidpod.dart'
     show RecipientNotReadyException, RecipientType, sendNotification;
 
 import 'package:solidui/src/constants/ui_colors.dart' show ActionColors;
+import 'package:solidui/src/utils/resilient_snack_bar.dart';
 
-/// Signature for the snack-bar reporter used to surface notification
-/// delivery outcomes back to the caller's UI.
-
-typedef NotifySnackBar = void Function(
-  String message,
-  Color backgroundColor, {
-  Duration duration,
-});
-
-/// Build a resilient [NotifySnackBar] bound to [messenger].
-///
-/// Showing a SnackBar requires a Scaffold registered with the messenger.
-/// Depending on how the host embeds the form, and on the exact moment the
-/// dialog is dismissed, the messenger can momentarily have no Scaffold,
-/// which throws the "_scaffolds.isNotEmpty" assertion. A confirmation toast
-/// is non-critical (the grant has already succeeded), so the call is guarded
-/// and retried once on the next frame rather than ever letting it crash the
-/// app.
-
-NotifySnackBar makeResilientSnackBar(ScaffoldMessengerState messenger) => (
-      String message,
-      Color backgroundColor, {
-      Duration duration = const Duration(seconds: 4),
-    }) {
-      SnackBar build() => SnackBar(
-            content: Text(message),
-            backgroundColor: backgroundColor,
-            duration: duration,
-          );
-      try {
-        messenger.showSnackBar(build());
-      } on Object catch (_) {
-        WidgetsBinding.instance.addPostFrameCallback((_) {
-          try {
-            messenger.showSnackBar(build());
-          } on Object catch (e) {
-            debugPrint('Could not show snackbar "$message": $e');
-          }
-        });
-      }
-    };
+// Re-exported so existing importers of this file (e.g.
+// grant_permission_form.dart) keep resolving `makeResilientSnackBar`/
+// `NotifySnackBar` without changes now that they live in their own file.
+export 'package:solidui/src/utils/resilient_snack_bar.dart';
 
 /// Send a "resource shared" notification to each recipient WebID and
 /// report delivery problems through [showSnack].

pubspec.yaml

@@ -1,6 +1,6 @@
 name: solidui
 description: 'A UI library for building Solid applications with Flutter.'
-version: 1.0.46
+version: 1.0.47
 homepage: https://github.com/anusii/solidui
 
 # Scaffold a new Solid Pod file-browser app (a pod browser, with navigation