Fabric: Introducting RCTViewComponentView

Summary:
Implementation of the native view component of <View>.
Root View also must have dedicated class even if its empty now.

Reviewed By: mdvacca

Differential Revision: D7526406

fbshipit-source-id: 9e14c9f679396c2cdb2d64c99086bb19df37c25c

React/Fabric/Mounting/RCTRootComponentView.h

@@ -0,0 +1,21 @@
+/**
+ * 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 <UIKit/UIKit.h>
+
+#import <React/RCTViewComponentView.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * UIView class for root <View> component.
+ */
+@interface RCTRootComponentView : RCTViewComponentView
+
+@end
+
+NS_ASSUME_NONNULL_END

React/Fabric/Mounting/RCTRootComponentView.mm

@@ -0,0 +1,12 @@
+/**
+ * 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 "RCTRootComponentView.h"
+
+@implementation RCTRootComponentView
+
+@end

React/Fabric/Mounting/RCTViewComponentView.h

@@ -0,0 +1,22 @@
+/**
+ * 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 <UIKit/UIKit.h>
+
+#import <React/RCTComponentViewProtocol.h>
+#import <React/UIView+ComponentViewProtocol.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * UIView class for <View> component.
+ */
+@interface RCTViewComponentView : UIView <RCTComponentViewProtocol>
+
+@end
+
+NS_ASSUME_NONNULL_END

React/Fabric/Mounting/RCTViewComponentView.mm

@@ -0,0 +1,33 @@
+/**
+ * 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 "RCTViewComponentView.h"
+
+#import <fabric/view/ViewProps.h>
+
+using namespace facebook::react;
+
+@implementation RCTViewComponentView
+
+- (void)updateProps:(facebook::react::SharedProps)props
+           oldProps:(facebook::react::SharedProps)oldProps
+{
+  if (!oldProps) {
+    oldProps = std::make_shared<ViewProps>();
+  }
+
+  auto oldViewProps = *std::dynamic_pointer_cast<const ViewProps>(oldProps);
+  auto newViewProps = *std::dynamic_pointer_cast<const ViewProps>(props);
+
+  if (oldViewProps.getBackgroundColor() != newViewProps.getBackgroundColor()) {
+    self.backgroundColor = [UIColor colorWithCGColor:newViewProps.getBackgroundColor().get()];
+  }
+
+  // TODO: Implement all sutable non-layout <View> props.
+}
+
+@end