add draft changes

lib/components/pages/legs.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 
 import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
 import 'package:mileograph_flutter/objects/objects.dart';
 import 'package:mileograph_flutter/services/dataService.dart';
 import 'package:provider/provider.dart';
@@ -279,6 +280,11 @@ class _LegsPageState extends State<LegsPage> {
         trailing: Column(
           mainAxisAlignment: MainAxisAlignment.center,
           children: [
+            IconButton(
+              tooltip: 'Edit entry',
+              icon: const Icon(Icons.edit),
+              onPressed: () => context.push('/legs/edit/${leg.id}'),
+            ),
             Text(
               '${leg.mileage.toStringAsFixed(1)} mi',
               style:

lib/main.dart

@@ -11,6 +11,7 @@ import 'package:mileograph_flutter/components/pages/legs.dart';
 import 'package:mileograph_flutter/services/apiService.dart';
 import 'package:mileograph_flutter/services/authservice.dart';
 import 'package:mileograph_flutter/services/dataService.dart';
+import 'package:mileograph_flutter/services/navigation_guard.dart';
 
 import 'components/login/login.dart';
 import 'components/pages/dashboard.dart';
@@ -100,6 +101,14 @@ class MyApp extends StatelessWidget {
             ),
             GoRoute(path: '/trips', builder: (_, __) => TripsPage()),
             GoRoute(path: '/add', builder: (_, __) => NewEntryPage()),
+            GoRoute(
+              path: '/legs/edit/:id',
+              builder: (_, state) {
+                final idParam = state.pathParameters['id'];
+                final legId = idParam == null ? null : int.tryParse(idParam);
+                return NewEntryPage(editLegId: legId);
+              },
+            ),
           ],
         ),
         GoRoute(path: '/login', builder: (_, __) => const LoginScreen()),
@@ -180,12 +189,14 @@ class _MyHomePageState extends State<MyHomePage> {
     return newIndex;
   }
 
-  void _onItemTapped(int index, int currentIndex) {
+  Future<void> _onItemTapped(int index, int currentIndex) async {
     if (index < 0 || index >= contentPages.length || index == currentIndex) {
       return;
     }
-    context.push(contentPages[index]);
-    _getIndexFromLocation(contentPages[index]);
+    await NavigationGuard.attemptNavigation(() async {
+      if (!mounted) return;
+      context.go(contentPages[index]);
+    });
   }
 
   bool loggedIn = false;

lib/services/navigation_guard.dart

@@ -0,0 +1,40 @@
+typedef NavigationGuardCallback = Future<bool> Function();
+
+class NavigationGuard {
+  static NavigationGuardCallback? _callback;
+
+  static void register(NavigationGuardCallback callback) {
+    _callback = callback;
+  }
+
+  static void unregister(NavigationGuardCallback callback) {
+    if (_callback == callback) {
+      _callback = null;
+    }
+  }
+
+  static Future<void> attemptNavigation(
+    Future<void> Function() performNavigation,
+  ) async {
+    if (_promptActive) return;
+    final cb = _callback;
+    if (cb == null) {
+      await performNavigation();
+      return;
+    }
+    _promptActive = true;
+    bool allow = false;
+    try {
+      allow = await cb();
+    } catch (_) {
+      allow = false;
+    } finally {
+      _promptActive = false;
+    }
+    if (allow) {
+      await performNavigation();
+    }
+  }
+
+  static bool _promptActive = false;
+}

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: "none" # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 0.1.3+1
+version: 0.1.4+1
 
 environment:
   sdk: ^3.8.1