feat: change logout button

ui/lib/main.dart

@@ -50,18 +50,41 @@ class MyApp extends StatelessWidget {
                   IconButton(
                       onPressed: () => context.go(SystemSettingsPage.route),
                       icon: const Icon(Icons.settings)),
-                  APIs.isLoggedIn
-                      ? IconButton(
-                          onPressed: () async {
-                            final SharedPreferences prefs =
-                                await SharedPreferences.getInstance();
-                            await prefs.remove('token');
-                            if (context.mounted) {
-                              context.go(LoginScreen.route);
-                            }
-                          },
-                          icon: const Icon(Icons.exit_to_app))
-                      : Container()
+                  FutureBuilder(
+                      future: APIs.isLoggedIn(),
+                      builder: (context, snapshot) {
+                        if (snapshot.hasData && snapshot.data == true) {
+                          return MenuAnchor(
+                            menuChildren: [
+                              MenuItemButton(
+                                leadingIcon: const Icon(Icons.exit_to_app),
+                                child: const Text("登出"),
+                                onPressed: () async {
+                                  final SharedPreferences prefs =
+                                      await SharedPreferences.getInstance();
+                                  await prefs.remove('token');
+                                  if (context.mounted) {
+                                    context.go(LoginScreen.route);
+                                  }
+                                },
+                              ),
+                            ],
+                            builder: (context, controller, child) {
+                              return TextButton(
+                                onPressed: () {
+                                  if (controller.isOpen) {
+                                    controller.close();
+                                  } else {
+                                    controller.open();
+                                  }
+                                },
+                                child: const Icon(Icons.account_circle),
+                              );
+                            },
+                          );
+                        }
+                        return Container();
+                      })
                 ],
               ),
               body: Center(
@@ -73,7 +96,11 @@ class MyApp extends StatelessWidget {
                   child: NavDrawer(),
                 ),
                 const VerticalDivider(thickness: 1, width: 1),
-                Flexible(flex: 7, child: Padding(padding: const EdgeInsets.all(20),child: child), )
+                Flexible(
+                  flex: 7,
+                  child:
+                      Padding(padding: const EdgeInsets.all(20), child: child),
+                )
               ]))),
         );
       },

ui/lib/providers/APIs.dart

@@ -44,22 +44,29 @@ class APIs {
 
   static Dio? gDio;
   static Map<String, String> authHeaders = {};
-  static bool isLoggedIn = false;
 
-  static Future<Dio> getDio() async {
-    if (gDio != null) {
-      return gDio!;
-    }
+  static Future<bool> isLoggedIn() async {
+    return isNotBlank(await getToken());
+  }
+
+  static Future<String> getToken() async {
     var token = authHeaders["Authorization"];
     if (isBlank(token)) {
       final SharedPreferences prefs = await SharedPreferences.getInstance();
       var t = prefs.getString("token");
       if (isNotBlank(t)) {
         authHeaders["Authorization"] = t!;
-        isLoggedIn = true;
         token = t;
       }
     }
+    return token ?? "";
+  }
+
+  static Future<Dio> getDio() async {
+    if (gDio != null) {
+      return gDio!;
+    }
+    var token = await getToken();
 
     var dio = Dio();
     dio.interceptors.add(InterceptorsWrapper(

ui/lib/providers/login.dart

@@ -1,8 +1,6 @@
 import 'dart:async';
 
-import 'package:dio/dio.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:shared_preferences/shared_preferences.dart';
 import 'package:ui/providers/APIs.dart';
 import 'package:ui/providers/server_response.dart';