Add FlutterDesktopEngineGetMessenger API

Author: swift-kim

shell/platform/tizen/flutter_tizen.cc

@@ -56,9 +56,14 @@ FlutterDesktopPluginRegistrarRef FlutterDesktopGetPluginRegistrar(
   return EngineFromHandle(engine)->GetPluginRegistrar();
 }
 
+FlutterDesktopMessengerRef FlutterDesktopEngineGetMessenger(
+    FlutterDesktopEngineRef engine) {
+  return EngineFromHandle(engine)->messenger();
+}
+
 FlutterDesktopMessengerRef FlutterDesktopPluginRegistrarGetMessenger(
     FlutterDesktopPluginRegistrarRef registrar) {
-  return registrar->engine->messenger.get();
+  return registrar->engine->messenger();
 }
 
 void FlutterDesktopPluginRegistrarSetDestructionHandler(

shell/platform/tizen/flutter_tizen_engine.cc

@@ -52,10 +52,10 @@ FlutterTizenEngine::FlutterTizenEngine(bool initialize_tizen_renderer)
         }
       });
 
-  messenger = std::make_unique<FlutterDesktopMessenger>();
-  messenger->engine = this;
+  messenger_ = std::make_unique<FlutterDesktopMessenger>();
+  messenger_->engine = this;
   message_dispatcher =
-      std::make_unique<flutter::IncomingMessageDispatcher>(messenger.get());
+      std::make_unique<flutter::IncomingMessageDispatcher>(messenger_.get());
 
   if (initialize_tizen_renderer) {
     InitializeTizenRenderer();

shell/platform/tizen/flutter_tizen_engine.h

@@ -95,8 +95,7 @@ class FlutterTizenEngine : public TizenRenderer::Delegate {
   // The Flutter engine instance.
   FLUTTER_API_SYMBOL(FlutterEngine) flutter_engine;
 
-  // The plugin messenger handle given to API clients.
-  std::unique_ptr<FlutterDesktopMessenger> messenger;
+  FlutterDesktopMessengerRef messenger() { return messenger_.get(); }
 
   // Message dispatch manager for messages from the Flutter engine.
   std::unique_ptr<flutter::IncomingMessageDispatcher> message_dispatcher;
@@ -138,6 +137,9 @@ class FlutterTizenEngine : public TizenRenderer::Delegate {
 
   bool HasTizenRenderer();
 
+  // The plugin messenger handle given to API clients.
+  std::unique_ptr<FlutterDesktopMessenger> messenger_;
+
   // The handlers listening to platform events.
   std::unique_ptr<KeyEventHandler> key_event_handler_;
   std::unique_ptr<TouchEventHandler> touch_event_handler_;

shell/platform/tizen/public/flutter_tizen.h

@@ -57,6 +57,10 @@ FLUTTER_EXPORT FlutterDesktopPluginRegistrarRef
 FlutterDesktopGetPluginRegistrar(FlutterDesktopEngineRef engine,
                                  const char* plugin_name);
 
+// Returns the messenger associated with the engine.
+FLUTTER_EXPORT FlutterDesktopMessengerRef
+FlutterDesktopEngineGetMessenger(FlutterDesktopEngineRef engine);
+
 FLUTTER_EXPORT void FlutterDesktopNotifyLocaleChange(
     FlutterDesktopEngineRef engine);