Clean up the embedder API and refactor (flutter-tizen#83)

* Rename types and functions

* Clean up engine APIs

* Add FlutterDesktopEngineGetMessenger API

* Refactor FlutterTizenEngine a bit

* Refactor channels

Author: swift-kim

shell/platform/tizen/BUILD.gn

@@ -94,9 +94,9 @@ template("embedder_for_profile") {
       "channels/settings_channel.cc",
       "channels/text_input_channel.cc",
       "external_texture_gl.cc",
+      "flutter_tizen_engine.cc",
       "flutter_tizen.cc",
       "key_event_handler.cc",
-      "tizen_embedder_engine.cc",
       "tizen_event_loop.cc",
       "tizen_log.cc",
       "tizen_renderer.cc",

shell/platform/tizen/channels/lifecycle_channel.h

@@ -11,6 +11,7 @@ class LifecycleChannel {
  public:
   explicit LifecycleChannel(FLUTTER_API_SYMBOL(FlutterEngine) flutter_engine);
   virtual ~LifecycleChannel();
+
   void AppIsInactive();
   void AppIsResumed();
   void AppIsPaused();

shell/platform/tizen/channels/localization_channel.cc

@@ -73,8 +73,8 @@ void LocalizationChannel::SendPlatformResolvedLocale() {
     return;
   }
 
-  FlutterLocale* flutterLocale = GetFlutterLocale(locale);
-  if (!flutterLocale) {
+  FlutterLocale* flutter_locale = GetFlutterLocale(locale);
+  if (!flutter_locale) {
     FT_LOGE("Language code is required but not present.");
     return;
   }
@@ -86,14 +86,15 @@ void LocalizationChannel::SendPlatformResolvedLocale() {
   document.AddMember("method", "setPlatformResolvedLocale", allocator);
 
   rapidjson::Value language_code, country_code, script_code, variant_code;
-  language_code.SetString(flutterLocale->language_code, allocator);
+  language_code.SetString(flutter_locale->language_code, allocator);
   country_code.SetString(
-      flutterLocale->country_code ? flutterLocale->country_code : "",
+      flutter_locale->country_code ? flutter_locale->country_code : "",
       allocator);
   script_code.SetString(
-      flutterLocale->script_code ? flutterLocale->script_code : "", allocator);
+      flutter_locale->script_code ? flutter_locale->script_code : "",
+      allocator);
   variant_code.SetString(
-      flutterLocale->variant_code ? flutterLocale->variant_code : "",
+      flutter_locale->variant_code ? flutter_locale->variant_code : "",
       allocator);
 
   rapidjson::Value args(rapidjson::kArrayType);
@@ -118,7 +119,7 @@ void LocalizationChannel::SendPlatformResolvedLocale() {
   message.response_handle = nullptr;
   FlutterEngineSendPlatformMessage(flutter_engine_, &message);
 
-  DestroyFlutterLocale(flutterLocale);
+  DestroyFlutterLocale(flutter_locale);
 }
 
 FlutterLocale* LocalizationChannel::GetFlutterLocale(const char* locale) {
@@ -166,39 +167,39 @@ FlutterLocale* LocalizationChannel::GetFlutterLocale(const char* locale) {
     variant[bufSize] = '\0';
   }
 
-  FlutterLocale* flutterLocale = new FlutterLocale;
-  flutterLocale->struct_size = sizeof(FlutterLocale);
-  flutterLocale->language_code = language;
-  flutterLocale->country_code = country;
-  flutterLocale->script_code = script;
-  flutterLocale->variant_code = variant;
+  FlutterLocale* flutter_locale = new FlutterLocale;
+  flutter_locale->struct_size = sizeof(FlutterLocale);
+  flutter_locale->language_code = language;
+  flutter_locale->country_code = country;
+  flutter_locale->script_code = script;
+  flutter_locale->variant_code = variant;
 
-  return flutterLocale;
+  return flutter_locale;
 }
 
-void LocalizationChannel::DestroyFlutterLocale(FlutterLocale* flutterLocale) {
-  if (flutterLocale) {
-    if (flutterLocale->language_code) {
-      delete[] flutterLocale->language_code;
-      flutterLocale->language_code = nullptr;
+void LocalizationChannel::DestroyFlutterLocale(FlutterLocale* flutter_locale) {
+  if (flutter_locale) {
+    if (flutter_locale->language_code) {
+      delete[] flutter_locale->language_code;
+      flutter_locale->language_code = nullptr;
     }
 
-    if (flutterLocale->country_code) {
-      delete[] flutterLocale->country_code;
-      flutterLocale->country_code = nullptr;
+    if (flutter_locale->country_code) {
+      delete[] flutter_locale->country_code;
+      flutter_locale->country_code = nullptr;
     }
 
-    if (flutterLocale->script_code) {
-      delete[] flutterLocale->script_code;
-      flutterLocale->script_code = nullptr;
+    if (flutter_locale->script_code) {
+      delete[] flutter_locale->script_code;
+      flutter_locale->script_code = nullptr;
     }
 
-    if (flutterLocale->variant_code) {
-      delete[] flutterLocale->variant_code;
-      flutterLocale->variant_code = nullptr;
+    if (flutter_locale->variant_code) {
+      delete[] flutter_locale->variant_code;
+      flutter_locale->variant_code = nullptr;
     }
 
-    delete flutterLocale;
-    flutterLocale = nullptr;
+    delete flutter_locale;
+    flutter_locale = nullptr;
   }
 }

shell/platform/tizen/channels/localization_channel.h

@@ -12,13 +12,15 @@ class LocalizationChannel {
   explicit LocalizationChannel(FLUTTER_API_SYMBOL(FlutterEngine)
                                    flutter_engine);
   virtual ~LocalizationChannel();
+
   void SendLocales();
 
  private:
   void SendPlatformResolvedLocale();
   FlutterLocale* GetFlutterLocale(const char* locale);
-  void DestroyFlutterLocale(FlutterLocale* flutterLocale);
+  void DestroyFlutterLocale(FlutterLocale* flutter_locale);
 
   FLUTTER_API_SYMBOL(FlutterEngine) flutter_engine_;
 };
+
 #endif  // EMBEDDER_LOCALIZATION_CHANNEL_H_

shell/platform/tizen/channels/platform_channel.cc

@@ -16,16 +16,14 @@ static constexpr char kChannelName[] = "flutter/platform";
 PlatformChannel::PlatformChannel(flutter::BinaryMessenger* messenger,
                                  TizenRenderer* renderer)
     : channel_(std::make_unique<flutter::MethodChannel<rapidjson::Document>>(
-          messenger, kChannelName, &flutter::JsonMethodCodec::GetInstance())) {
+          messenger, kChannelName, &flutter::JsonMethodCodec::GetInstance())),
+      renderer_(renderer) {
   channel_->SetMethodCallHandler(
       [this](
           const flutter::MethodCall<rapidjson::Document>& call,
           std::unique_ptr<flutter::MethodResult<rapidjson::Document>> result) {
         HandleMethodCall(call, std::move(result));
       });
-  // renderer pointer is managed by TizenEmbedderEngine
-  // !! can be nullptr in case of service application !!
-  tizen_renderer_ = renderer;
 }
 
 PlatformChannel::~PlatformChannel() {}
@@ -49,7 +47,7 @@ void PlatformChannel::HandleMethodCall(
   } else if (method == "Clipboard.hasStrings") {
     result->NotImplemented();
   } else if (method == "SystemChrome.setPreferredOrientations") {
-    if (tizen_renderer_) {
+    if (renderer_) {
       static const std::string kPortraitUp = "DeviceOrientation.portraitUp";
       static const std::string kPortraitDown = "DeviceOrientation.portraitDown";
       static const std::string kLandscapeLeft =
@@ -79,7 +77,7 @@ void PlatformChannel::HandleMethodCall(
         FT_LOGD("No rotations passed, using default values");
         rotations = {0, 90, 180, 270};
       }
-      tizen_renderer_->SetPreferredOrientations(rotations);
+      renderer_->SetPreferredOrientations(rotations);
       result->Success();
     } else {
       result->Error("Not supported for service applications");

shell/platform/tizen/channels/platform_channel.h

@@ -17,12 +17,15 @@ class PlatformChannel {
   virtual ~PlatformChannel();
 
  private:
-  std::unique_ptr<flutter::MethodChannel<rapidjson::Document>> channel_;
-  TizenRenderer* tizen_renderer_;
-
   void HandleMethodCall(
       const flutter::MethodCall<rapidjson::Document>& call,
       std::unique_ptr<flutter::MethodResult<rapidjson::Document>> result);
+
+  std::unique_ptr<flutter::MethodChannel<rapidjson::Document>> channel_;
+
+  // A reference to the renderer object managed by FlutterTizenEngine.
+  // This can be nullptr if the engine is running in headless mode.
+  TizenRenderer* renderer_;
 };
 
 #endif  //  EMBEDDER_PLATFORM_CHANNEL_H_

shell/platform/tizen/channels/platform_view_channel.cc

@@ -8,8 +8,8 @@
 #include "flutter/shell/platform/common/cpp/client_wrapper/include/flutter/standard_method_codec.h"
 #include "flutter/shell/platform/common/cpp/json_method_codec.h"
 #include "flutter/shell/platform/tizen/channels/text_input_channel.h"
+#include "flutter/shell/platform/tizen/flutter_tizen_engine.h"
 #include "flutter/shell/platform/tizen/public/flutter_platform_view.h"
-#include "flutter/shell/platform/tizen/tizen_embedder_engine.h"
 #include "flutter/shell/platform/tizen/tizen_log.h"
 
 static constexpr char kChannelName[] = "flutter/platform_views";
@@ -68,7 +68,7 @@ flutter::EncodableList ExtractListFromMap(
 }
 
 PlatformViewChannel::PlatformViewChannel(flutter::BinaryMessenger* messenger,
-                                         TizenEmbedderEngine* engine)
+                                         FlutterTizenEngine* engine)
     : engine_(engine),
       channel_(
           std::make_unique<flutter::MethodChannel<flutter::EncodableValue>>(

shell/platform/tizen/channels/platform_view_channel.h

@@ -13,15 +13,17 @@
 #include "flutter/shell/platform/common/cpp/client_wrapper/include/flutter/method_channel.h"
 #include "rapidjson/document.h"
 
-class TizenEmbedderEngine;
+class FlutterTizenEngine;
 class PlatformView;
 class PlatformViewFactory;
 class PlatformViewChannel {
  public:
   explicit PlatformViewChannel(flutter::BinaryMessenger* messenger,
-                               TizenEmbedderEngine* engine);
+                               FlutterTizenEngine* engine);
   virtual ~PlatformViewChannel();
+
   void Dispose();
+
   std::map<std::string, std::unique_ptr<PlatformViewFactory>>& ViewFactories() {
     return view_factories_;
   }
@@ -34,14 +36,14 @@ class PlatformViewChannel {
   void DispatchCompositionEndEvent(const std::string& key);
 
  private:
-  TizenEmbedderEngine* engine_;
-  std::unique_ptr<flutter::MethodChannel<flutter::EncodableValue>> channel_;
-  std::map<std::string, std::unique_ptr<PlatformViewFactory>> view_factories_;
-  std::map<int, PlatformView*> view_instances_;
-
   void HandleMethodCall(
       const flutter::MethodCall<flutter::EncodableValue>& call,
       std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result);
+
+  FlutterTizenEngine* engine_;
+  std::unique_ptr<flutter::MethodChannel<flutter::EncodableValue>> channel_;
+  std::map<std::string, std::unique_ptr<PlatformViewFactory>> view_factories_;
+  std::map<int, PlatformView*> view_instances_;
 };
 
 #endif  //  EMBEDDER_PLATFORM_VIEW_CHANNEL_H_

shell/platform/tizen/channels/settings_channel.cc

@@ -4,15 +4,15 @@
 
 #include "settings_channel.h"
 
-static constexpr char CHANNEL_NAME[] = "flutter/settings";
-static constexpr char TEXT_SCALE_FACTOR[] = "textScaleFactor";
-static constexpr char ALWAYS_USE_24_HOUR_FORMAT[] = "alwaysUse24HourFormat";
-static constexpr char PLATFORM_BRIGHTNESS[] = "platformBrightness";
+static constexpr char kChannelName[] = "flutter/settings";
+static constexpr char kTextScaleFactorKey[] = "textScaleFactor";
+static constexpr char kAlwaysUse24HourFormatKey[] = "alwaysUse24HourFormat";
+static constexpr char kPlatformBrightnessKey[] = "platformBrightness";
 
 SettingsChannel::SettingsChannel(flutter::BinaryMessenger* messenger)
     : channel_(
           std::make_unique<flutter::BasicMessageChannel<rapidjson::Document>>(
-              messenger, CHANNEL_NAME,
+              messenger, kChannelName,
               &flutter::JsonMessageCodec::GetInstance())) {
   system_settings_set_changed_cb(SYSTEM_SETTINGS_KEY_LOCALE_TIMEFORMAT_24HOUR,
                                  OnSettingsChangedCallback, this);
@@ -31,16 +31,15 @@ void SettingsChannel::SendSettingsEvent() {
   int ret = system_settings_get_value_bool(
       SYSTEM_SETTINGS_KEY_LOCALE_TIMEFORMAT_24HOUR, &value);
   if (ret == SYSTEM_SETTINGS_ERROR_NONE) {
-    event.AddMember(TEXT_SCALE_FACTOR, 1.0, allocator);
-    event.AddMember(PLATFORM_BRIGHTNESS, "light", allocator);
-    event.AddMember(ALWAYS_USE_24_HOUR_FORMAT, value, allocator);
+    event.AddMember(kTextScaleFactorKey, 1.0, allocator);
+    event.AddMember(kPlatformBrightnessKey, "light", allocator);
+    event.AddMember(kAlwaysUse24HourFormatKey, value, allocator);
     channel_->Send(event);
   }
 }
 
 void SettingsChannel::OnSettingsChangedCallback(system_settings_key_e key,
                                                 void* user_data) {
-  SettingsChannel* settingsChannel =
-      reinterpret_cast<SettingsChannel*>(user_data);
-  settingsChannel->SendSettingsEvent();
+  auto settings_channel = reinterpret_cast<SettingsChannel*>(user_data);
+  settings_channel->SendSettingsEvent();
 }

shell/platform/tizen/channels/settings_channel.h

@@ -18,10 +18,11 @@ class SettingsChannel {
   virtual ~SettingsChannel();
 
  private:
-  std::unique_ptr<flutter::BasicMessageChannel<rapidjson::Document>> channel_;
   static void OnSettingsChangedCallback(system_settings_key_e key,
                                         void* user_data);
   void SendSettingsEvent();
+
+  std::unique_ptr<flutter::BasicMessageChannel<rapidjson::Document>> channel_;
 };
 
 #endif  // EMBEDDER_SETTINGS_CHANNEL_H_