[windows] feat: Add onWindowsTaskbarCreated Method.

example/lib/pages/home.dart

@@ -295,4 +295,10 @@ class _HomePageState extends State<HomePage> with TrayListener {
       text: '${menuItem.toJson()}',
     );
   }
+
+  @override
+  void onWindowsTaskbarCreated() {
+    debugPrint('onWindowsTaskbarCreated');
+    _handleSetIcon(_iconType);
+  }
 }

example/windows/runner/Runner.rc

@@ -60,14 +60,14 @@ IDI_APP_ICON            ICON                    "resources\\app_icon.ico"
 // Version
 //
 
-#ifdef FLUTTER_BUILD_NUMBER
-#define VERSION_AS_NUMBER FLUTTER_BUILD_NUMBER
+#if defined(FLUTTER_VERSION_MAJOR) && defined(FLUTTER_VERSION_MINOR) && defined(FLUTTER_VERSION_PATCH) && defined(FLUTTER_VERSION_BUILD)
+#define VERSION_AS_NUMBER FLUTTER_VERSION_MAJOR,FLUTTER_VERSION_MINOR,FLUTTER_VERSION_PATCH,FLUTTER_VERSION_BUILD
 #else
-#define VERSION_AS_NUMBER 1,0,0
+#define VERSION_AS_NUMBER 1,0,0,0
 #endif
 
-#ifdef FLUTTER_BUILD_NAME
-#define VERSION_AS_STRING #FLUTTER_BUILD_NAME
+#if defined(FLUTTER_VERSION)
+#define VERSION_AS_STRING FLUTTER_VERSION
 #else
 #define VERSION_AS_STRING "1.0.0"
 #endif

lib/src/tray_listener.dart

@@ -12,4 +12,7 @@ abstract class TrayListener {
   void onTrayIconRightMouseUp() {}
 
   void onTrayMenuItemClick(MenuItem menuItem) {}
+
+  /// Emitted when windows taskbar created, such as explorer.exe restarted
+  void onWindowsTaskbarCreated() {}
 }

lib/src/tray_manager.dart

@@ -16,6 +16,7 @@ const kEventOnTrayIconMouseUp = 'onTrayIconMouseUp';
 const kEventOnTrayIconRightMouseDown = 'onTrayIconRightMouseDown';
 const kEventOnTrayIconRightMouseUp = 'onTrayIconRightMouseUp';
 const kEventOnTrayMenuItemClick = 'onTrayMenuItemClick';
+const kWindowsTaskbarCreated = 'onWindowsTaskbarCreated';
 
 enum TrayIconPositon { left, right }
 
@@ -64,6 +65,9 @@ class TrayManager {
             }
           }
           break;
+        case kWindowsTaskbarCreated:
+          listener.onWindowsTaskbarCreated();
+          break;
       }
     }
   }

windows/tray_manager_plugin.cpp

@@ -50,6 +50,7 @@ class TrayManagerPlugin : public flutter::Plugin {
   NOTIFYICONIDENTIFIER niif;
   HMENU hMenu;
   bool tray_icon_setted = false;
+  UINT windows_taskbar_created_message = 0;
 
   // The ID of the WindowProc delegate registration.
   int window_proc_id = -1;
@@ -105,6 +106,7 @@ void TrayManagerPlugin::RegisterWithRegistrar(
 
 TrayManagerPlugin::TrayManagerPlugin(flutter::PluginRegistrarWindows* registrar)
     : registrar(registrar) {
+  windows_taskbar_created_message = RegisterWindowMessage(L"TaskbarCreated");
   window_proc_id = registrar->RegisterTopLevelWindowProcDelegate(
       [this](HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
         return HandleWindowProc(hwnd, message, wparam, lparam);
@@ -197,6 +199,16 @@ std::optional<LRESULT> TrayManagerPlugin::HandleWindowProc(HWND hWnd,
       default:
         return DefWindowProc(hWnd, message, wParam, lParam);
     };
+  } else {
+    bool isTaskBarCreateMsg = windows_taskbar_created_message != 0 
+        && message == windows_taskbar_created_message;
+    if (isTaskBarCreateMsg) {
+        channel->InvokeMethod(
+        "onWindowsTaskbarCreated",
+        std::make_unique<flutter::EncodableValue>(nullptr));
+        tray_icon_setted = false;
+        return LRESULT(0);
+    }
   }
   return result;
 }