offline options globally toggleable

2026-09-26 19:11:52 +02:00 · 2026-07-25 20:40:15 -05:00
parent 6f017fd6c1
commit dfcc64e96e
24 changed files with 489 additions and 92 deletions
@@ -0,0 +1,100 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import '../../../app_state.dart';
+import '../../../services/offline_area_service.dart';
+import '../../../services/localization_service.dart';
+
+/// Master toggle for all offline-area functionality (downloading, browsing,
+/// and using cached tiles/nodes offline). When disabled, the rest of the
+/// Offline Settings screen (offline mode + offline areas list) is greyed out
+/// and the download button on the map screen is hidden. Functionally, the
+/// app will behave as if no offline area data exists at all while this is
+/// off, regardless of whether area files still exist on disk.
+class EnableOfflineFeaturesSection extends StatelessWidget {
+  const EnableOfflineFeaturesSection({super.key});
+
+  Future<void> _handleToggle(BuildContext context, AppState appState, bool value) async {
+    if (value) {
+      // Enabling requires no confirmation.
+      await appState.setOfflineFeaturesEnabled(true);
+      return;
+    }
+
+    // Disabling: if offline area data already exists, ask whether to keep
+    // or delete it. Either choice proceeds to disable the toggle - there is
+    // no "cancel" path once this dialog is shown.
+    final offlineService = OfflineAreaService();
+    await offlineService.ensureInitialized();
+    final hasExistingAreas = offlineService.offlineAreas.isNotEmpty;
+
+    if (!hasExistingAreas) {
+      await appState.setOfflineFeaturesEnabled(false);
+      return;
+    }
+
+    final locService = LocalizationService.instance;
+    final shouldDelete = await showDialog<bool>(
+      context: context,
+      barrierDismissible: false,
+      builder: (context) => AlertDialog(
+        title: Text(locService.t('offlineAreas.disableConfirmTitle')),
+        content: Text(locService.t('offlineAreas.disableConfirmMessage')),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(false),
+            child: Text(locService.t('offlineAreas.keepData')),
+          ),
+          ElevatedButton(
+            onPressed: () => Navigator.of(context).pop(true),
+            style: ElevatedButton.styleFrom(
+              backgroundColor: Colors.red,
+              foregroundColor: Colors.white,
+            ),
+            child: Text(locService.t('offlineAreas.deleteData')),
+          ),
+        ],
+      ),
+    );
+
+    if (shouldDelete == true) {
+      for (final area in offlineService.offlineAreas.toList()) {
+        offlineService.deleteArea(area.id);
+      }
+    }
+
+    // Disable regardless of the user's data choice.
+    await appState.setOfflineFeaturesEnabled(false);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AnimatedBuilder(
+      animation: LocalizationService.instance,
+      builder: (context, child) {
+        final locService = LocalizationService.instance;
+        final appState = context.watch<AppState>();
+
+        return Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(
+              locService.t('settings.enableOfflineFeatures'),
+              style: Theme.of(context).textTheme.titleMedium,
+            ),
+            const SizedBox(height: 8),
+            SwitchListTile(
+              contentPadding: EdgeInsets.zero,
+              title: Text(locService.t('settings.enableOfflineFeaturesTitle')),
+              subtitle: Text(
+                locService.t('settings.enableOfflineFeaturesSubtitle'),
+                style: const TextStyle(fontSize: 12),
+              ),
+              value: appState.offlineFeaturesEnabled,
+              onChanged: (value) => _handleToggle(context, appState, value),
+            ),
+          ],
+        );
+      },
+    );
+  }
+}