Fabric: RCTComponentViewProtocol

Summary: RCTComponentViewProtocol is a protocol for all UIView instances which are managed by React/MountingManager.

Reviewed By: mdvacca

Differential Revision: D7507520

fbshipit-source-id: dcbed8c5d0cc97f72942508aeccb445833ade271

React/Fabric/Mounting/RCTComponentViewProtocol.h

@@ -0,0 +1,64 @@
+/**
+ * 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 <fabric/core/Props.h>
+#import <fabric/core/LayoutMetrics.h>
+#import <React/RCTPrimitives.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * Represents a `UIView` instance managed by React.
+ * All methods are non-@optional.
+ * `UIView+ComponentViewProtocol` category provides default implementation
+ * for all of them.
+ */
+@protocol RCTComponentViewProtocol <NSObject>
+
+/*
+ * Called for mounting (attaching) a child component view inside `self`
+ * component view.
+ * Receiver must add `childComponentView` as a subview.
+ */
+- (void)mountChildComponentView:(UIView<RCTComponentViewProtocol> *)childComponentView
+                          index:(NSInteger)index;
+
+/*
+ * Called for unmounting (detaching) a child component view from `self`
+ * component view.
+ * Receiver must remove `childComponentView` as a subview.
+ */
+- (void)unmountChildComponentView:(UIView<RCTComponentViewProtocol> *)childComponentView
+                            index:(NSInteger)index;
+
+/*
+ * Called for updating component's props.
+ * Receiver must update native view props accordingly changed props.
+ */
+- (void)updateProps:(facebook::react::SharedProps)props
+           oldProps:(facebook::react::SharedProps)oldProps;
+
+/*
+ * Called for updating component's layout metrics.
+ * Receiver must update `UIView` layout-related fields (such as `frame`,
+ * `bounds`, `layer.zPosition`, and so on) accordingly.
+ */
+- (void)updateLayoutMetrics:(facebook::react::LayoutMetrics)layoutMetrics
+           oldLayoutMetrics:(facebook::react::LayoutMetrics)oldLayoutMetrics;
+
+/*
+ * Called right after the component view is moved to a recycle pool.
+ * Receiver must reset any local state and release associated
+ * non-reusable resources.
+ */
+- (void)prepareForRecycle;
+
+@end
+
+NS_ASSUME_NONNULL_END

React/Fabric/RCTPrimitives.h

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+/**
+ * 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>
+
+typedef NSInteger ReactTag;