ピンをタップしたらメモを編集するページに遷移するコードを追加

lib/features/map/data/pin_repository.dart

@@ -61,13 +61,15 @@ class PinData {
   final LatLng position;
   final DateTime createdAt;
   final bool isLocal;
+  final String? memo;
 
   PinData({
     required this.id,
     required this.userId,
     required this.position,
     required this.createdAt,
     this.isLocal = false,
+    this.memo,
   });
 
   factory PinData.local(LatLng position) {
@@ -90,6 +92,7 @@ class PinData {
       ),
       createdAt: DateTime.parse(json['createdAt'] as String),
       isLocal: json['isLocal'] as bool? ?? false,
+      memo: json['memo'] as String?,
     );
   }
 
@@ -101,6 +104,7 @@ class PinData {
       'longitude': position.longitude,
       'createdAt': createdAt.toUtc().toIso8601String(),
       'isLocal': isLocal,
+      'memo': memo,
     };
   }
 }

lib/features/map/presentation/map_screen.dart

@@ -39,7 +39,10 @@ class _MapScreenState extends ConsumerState<MapScreen> {
         width: 60,
         height: 60,
         alignment: Alignment.topCenter,
-        child: const Icon(Icons.location_pin, size: 60, color: Colors.red),
+        child: GestureDetector(
+          onTap: () => context.push('/memo/${pin.id}'),
+          child: const Icon(Icons.location_pin, size: 60, color: Colors.red),
+        ),
       );
     }).toList();
   }

lib/features/map/presentation/memo_edit_screen.dart

@@ -0,0 +1,89 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+import 'package:memomap/features/map/providers/pin_provider.dart';
+
+class MemoEditScreen extends ConsumerStatefulWidget {
+  const MemoEditScreen({super.key, required this.pinId});
+
+  final String pinId;
+
+  @override
+  ConsumerState<MemoEditScreen> createState() => _MemoEditScreenState();
+}
+
+class _MemoEditScreenState extends ConsumerState<MemoEditScreen> {
+  late final TextEditingController _controller;
+  String? _initialMemo;
+
+  @override
+  void initState() {
+    super.initState();
+    final pins = ref.read(pinsProvider).valueOrNull ?? [];
+    final pin = pins.where((p) => p.id == widget.pinId).firstOrNull;
+    _initialMemo = pin?.memo;
+    _controller = TextEditingController(text: _initialMemo ?? '');
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  void _saveMemo() {
+    final text = _controller.text.trim();
+    final memo = text.isEmpty ? null : text;
+    ref.read(pinsProvider.notifier).updatePinMemo(widget.pinId, memo);
+    context.pop();
+  }
+
+  void _deleteMemo() {
+    ref.read(pinsProvider.notifier).updatePinMemo(widget.pinId, null);
+    context.pop();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final hasMemo = _initialMemo != null && _initialMemo!.isNotEmpty;
+
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(hasMemo ? 'メモを編集' : 'メモを追加'),
+      ),
+      body: Padding(
+        padding: const EdgeInsets.all(16.0),
+        child: Column(
+          children: [
+            TextField(
+              controller: _controller,
+              maxLines: null,
+              decoration: const InputDecoration(
+                hintText: 'ここにメモを入力',
+                border: OutlineInputBorder(),
+              ),
+            ),
+            const SizedBox(height: 16),
+            Row(
+              mainAxisAlignment: MainAxisAlignment.spaceBetween,
+              children: [
+                if (hasMemo)
+                  TextButton(
+                    style: TextButton.styleFrom(
+                      foregroundColor: Colors.red,
+                    ),
+                    onPressed: _deleteMemo,
+                    child: const Text('削除'),
+                  ),
+                ElevatedButton(
+                  onPressed: _saveMemo,
+                  child: const Text('保存'),
+                ),
+              ],
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/features/map/providers/pin_provider.dart

@@ -126,6 +126,31 @@ class PinsNotifier extends AsyncNotifier<List<PinData>> {
     }
   }
 
+  Future<void> updatePinMemo(String id, String? memo) async {
+    final pins = state.value ?? [];
+    final index = pins.indexWhere((p) => p.id == id);
+    if (index == -1) return;
+
+    final updatedPin = PinData(
+      id: pins[index].id,
+      userId: pins[index].userId,
+      position: pins[index].position,
+      createdAt: pins[index].createdAt,
+      isLocal: pins[index].isLocal,
+      memo: memo,
+    );
+
+    final newPins = List<PinData>.from(pins);
+    newPins[index] = updatedPin;
+
+    state = AsyncValue.data(newPins);
+
+    // Update local storage
+    final storage = ref.read(localPinStorageProvider);
+    await storage.setLocalPins(newPins.where((p) => p.isLocal).toList());
+    await storage.setCachedPins(newPins.where((p) => !p.isLocal).toList());
+  }
+
   Future<void> refresh() async {
     state = const AsyncValue.loading();
     state = await AsyncValue.guard(() => build());

lib/router/app_router.dart

@@ -4,6 +4,7 @@ import 'package:go_router/go_router.dart';
 import 'package:memomap/features/auth/presentation/login_screen.dart';
 import 'package:memomap/features/auth/providers/auth_provider.dart';
 import 'package:memomap/features/map/presentation/map_screen.dart';
+import 'package:memomap/features/map/presentation/memo_edit_screen.dart';
 import 'package:memomap/features/profile/presentation/profile_screen.dart';
 
 final routerProvider = Provider<GoRouter>((ref) {
@@ -43,8 +44,11 @@ final routerProvider = Provider<GoRouter>((ref) {
         },
       ),
       GoRoute(
-        path: '/auth-callback',
-        builder: (context, state) => const AuthCallbackScreen(),
+        path: '/memo/:pinId',
+        builder: (context, state) {
+          final pinId = state.pathParameters['pinId']!;
+          return MemoEditScreen(pinId: pinId);
+        },
       ),
     ],
     errorBuilder: (context, state) => Scaffold(