container unsaved changes warning

Author: FaFre

apps/weblibre/lib/features/geckoview/features/tabs/presentation/dialogs/discard_changes_dialog.dart

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2024-2026 Fabian Freund.
+ *
+ * This file is part of WebLibre
+ * (see https://weblibre.eu).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import 'package:flutter/material.dart';
+
+enum DiscardChangesChoice { discard, save }
+
+Future<DiscardChangesChoice?> showDiscardChangesDialog(BuildContext context) {
+  return showDialog<DiscardChangesChoice?>(
+    context: context,
+    builder: (BuildContext context) {
+      return AlertDialog(
+        icon: const Icon(Icons.warning),
+        title: const Text('Unsaved Changes'),
+        content: const Text(
+          'You have unsaved changes. Do you want to save them before leaving?',
+        ),
+        actions: <Widget>[
+          TextButton(
+            onPressed: () {
+              Navigator.pop(context);
+            },
+            child: const Text('Cancel'),
+          ),
+          TextButton(
+            onPressed: () {
+              Navigator.pop(context, DiscardChangesChoice.discard);
+            },
+            child: const Text('Discard'),
+          ),
+          TextButton(
+            onPressed: () {
+              Navigator.pop(context, DiscardChangesChoice.save);
+            },
+            child: const Text('Save'),
+          ),
+        ],
+      );
+    },
+  );
+}