iOS: create C++ <-> ObjC++ connector for FabricUIManager to do UI operations

Reviewed By: shergin

Differential Revision: D7162911

fbshipit-source-id: 3e303020dafdccc51f52c3359a7054dc8a787978

React/Fabric/RCTFabricPlatformUIOperationManager.h

@@ -0,0 +1,46 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+
+#import <memory>
+
+#include <fabric/IFabricPlatformUIOperationManager.h>
+
+@class RCTFabricPlatformUIOperationManager;
+
+namespace facebook {
+namespace react {
+
+/**
+ * Connector class (from C++ to ObjC++) to allow FabricUIManager to invoke native UI operations/updates.
+ * UIKit-related impl doesn't live here, but this class gets passed to the FabricUIManager C++ impl directly.
+ */
+class RCTFabricPlatformUIOperationManagerConnector : public IFabricPlatformUIOperationManager {
+public:
+  RCTFabricPlatformUIOperationManagerConnector();
+  ~RCTFabricPlatformUIOperationManagerConnector();
+
+  void performUIOperation();
+
+private:
+  void *self_;
+  RCTFabricPlatformUIOperationManager *manager_;
+};
+
+} // namespace react
+} // namespace facebook
+
+/**
+ * Actual ObjC++ implementation of the UI operations.
+ */
+@interface RCTFabricPlatformUIOperationManager : NSObject
+
+- (void)performUIOperation;
+
+@end

React/Fabric/RCTFabricPlatformUIOperationManager.mm

@@ -0,0 +1,48 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import "RCTFabricPlatformUIOperationManager.h"
+
+namespace facebook {
+namespace react {
+
+RCTFabricPlatformUIOperationManagerConnector::RCTFabricPlatformUIOperationManagerConnector() {
+  self_ = (__bridge_retained void *)[RCTFabricPlatformUIOperationManager new];
+  manager_ = (__bridge RCTFabricPlatformUIOperationManager *)self_;
+}
+
+RCTFabricPlatformUIOperationManagerConnector::~RCTFabricPlatformUIOperationManagerConnector() {
+  CFRelease(self_);
+  self_ = NULL;
+  manager_ = NULL;
+}
+
+void RCTFabricPlatformUIOperationManagerConnector::performUIOperation() {
+  [manager_ performUIOperation];
+}
+
+} // namespace react
+} // namespace facebook
+
+// -----------------------------------------------------------------------------
+// Start of ObjC++ impl
+// Access UIKit here.
+// -----------------------------------------------------------------------------
+@implementation RCTFabricPlatformUIOperationManager
+
+- (void)dealloc
+{
+  NSLog(@"RCTFabricPlatformUIOperationManager: dealloc()");
+}
+
+- (void)performUIOperation
+{
+  // TODO
+  NSLog(@"RCTFabricPlatformUIOperationManager: performUIOperation()");
+}
+
+@end

React/Fabric/RCTFabricUIManagerWrapper.h

@@ -18,8 +18,8 @@ namespace react {
 
 class FabricUIManager;
 
-}
-}
+} // namespace react
+} // namespace facebook
 
 using namespace facebook::react;
 
@@ -28,7 +28,6 @@ using namespace facebook::react;
  */
 @interface RCTFabricUIManagerWrapper : NSObject <RCTInvalidating>
 
-- (instancetype)initWithManager:(std::shared_ptr<FabricUIManager>)manager;
 - (std::shared_ptr<FabricUIManager>)manager;
 
 @end

React/Fabric/RCTFabricUIManagerWrapper.mm

@@ -9,17 +9,21 @@
 
 #include <fabric/FabricUIManager.h>
 
+#import "RCTFabricPlatformUIOperationManager.h"
+
 // This file contains experimental placeholders, nothing is finalized.
 @implementation RCTFabricUIManagerWrapper
 {
   std::shared_ptr<FabricUIManager> _manager;
+  std::shared_ptr<IFabricPlatformUIOperationManager> _platformUIOperationManager;
 }
 
-- (instancetype)initWithManager:(std::shared_ptr<FabricUIManager>)manager
+- (instancetype)init
 {
   self = [super init];
   if (self) {
-    _manager = manager;
+    _platformUIOperationManager = std::make_shared<RCTFabricPlatformUIOperationManagerConnector>();
+    _manager = std::make_shared<FabricUIManager>(_platformUIOperationManager);
   }
   return self;
 }