Add IsFocused/SetFocus APIs to TizenView (#354)

* Add getter and setter of focused state of TizenView

and change Unfocus() method to SetFocus().

* Update based on review

* Fix name

Author: JSUYA

shell/platform/tizen/channels/platform_channel.cc

@@ -161,7 +161,7 @@ void PlatformChannel::SystemNavigatorPop() {
   if (view_->GetType() == TizenViewType::kWindow) {
     ui_app_exit();
   } else {
-    reinterpret_cast<TizenView*>(view_)->Unfocus();
+    reinterpret_cast<TizenView*>(view_)->SetFocus(false);
   }
 }
 

shell/platform/tizen/flutter_tizen.cc

@@ -13,6 +13,7 @@
 #include "flutter/shell/platform/tizen/flutter_tizen_view.h"
 #include "flutter/shell/platform/tizen/logger.h"
 #include "flutter/shell/platform/tizen/public/flutter_platform_view.h"
+#include "flutter/shell/platform/tizen/tizen_view.h"
 #include "flutter/shell/platform/tizen/tizen_window.h"
 #ifndef WEARABLE_PROFILE
 #include "flutter/shell/platform/tizen/tizen_window_ecore_wl2.h"
@@ -274,6 +275,23 @@ void FlutterDesktopViewOnKeyEvent(FlutterDesktopViewRef view,
                               is_down);
 }
 
+void FlutterDesktopViewSetFocus(FlutterDesktopViewRef view, bool focused) {
+  auto* tizen_view = reinterpret_cast<flutter::TizenViewBase*>(
+      ViewFromHandle(view)->tizen_view());
+  if (tizen_view->GetType() == flutter::TizenViewType::kView) {
+    reinterpret_cast<flutter::TizenView*>(tizen_view)->SetFocus(focused);
+  }
+}
+
+bool FlutterDesktopViewIsFocused(FlutterDesktopViewRef view) {
+  auto* tizen_view = reinterpret_cast<flutter::TizenViewBase*>(
+      ViewFromHandle(view)->tizen_view());
+  if (tizen_view->GetType() == flutter::TizenViewType::kView) {
+    return reinterpret_cast<flutter::TizenView*>(tizen_view)->focused();
+  }
+  return false;
+}
+
 void FlutterDesktopRegisterViewFactory(
     FlutterDesktopPluginRegistrarRef registrar,
     const char* view_type,

shell/platform/tizen/public/flutter_tizen.h

@@ -216,6 +216,11 @@ FLUTTER_EXPORT void FlutterDesktopViewOnKeyEvent(FlutterDesktopViewRef view,
                                                  uint32_t scan_code,
                                                  bool is_down);
 
+FLUTTER_EXPORT void FlutterDesktopViewSetFocus(FlutterDesktopViewRef view,
+                                               bool focused);
+
+FLUTTER_EXPORT bool FlutterDesktopViewIsFocused(FlutterDesktopViewRef view);
+
 // ========== Plugin Registrar (extensions) ==========
 
 // Returns the view associated with this registrar's engine instance.

shell/platform/tizen/tizen_view.h

@@ -20,7 +20,9 @@ class TizenView : public TizenViewBase {
 
   TizenViewType GetType() override { return TizenViewType::kView; };
 
-  void Unfocus() { focused_ = false; };
+  bool focused() { return focused_; };
+
+  void SetFocus(bool focused) { focused_ = focused; };
 
  protected:
   explicit TizenView(int32_t width, int32_t height)