react-native/React/Views/RCTComponent.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 <CoreGraphics/CoreGraphics.h>
#import <Foundation/Foundation.h>
/**
* These block types can be used for mapping input event handlers from JS to view
* properties. Unlike JS method callbacks, these can be called multiple times.
*/
typedef void (^RCTDirectEventBlock)(NSDictionary *body);
typedef void (^RCTBubblingEventBlock)(NSDictionary *body);
/**
* Logical node in a tree of application components. Both `ShadowView` and
* `UIView` conforms to this. Allows us to write utilities that reason about
* trees generally.
*/
@protocol RCTComponent <NSObject>
@property (nonatomic, copy) NSNumber *reactTag;
- (void)insertReactSubview:(id<RCTComponent>)subview atIndex:(NSInteger)atIndex;
- (void)removeReactSubview:(id<RCTComponent>)subview;
- (NSArray<id<RCTComponent>> *)reactSubviews;
- (id<RCTComponent>)reactSuperview;
- (NSNumber *)reactTagAtPoint:(CGPoint)point;
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// View/ShadowView is a root view
- (BOOL)isReactRootView;
/**
* Called each time props have been set.
* Not all props have to be set - React can set only changed ones.
* @param changedProps String names of all set props.
*/
- (void)didSetProps:(NSArray<NSString *> *)changedProps;
/**
* Called each time subviews have been updated
*/
- (void)didUpdateReactSubviews;
@end
// TODO: this is kinda dumb - let's come up with a
// better way of identifying root React views please!
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static inline BOOL RCTIsReactRootView(NSNumber *reactTag)
{
return reactTag.integerValue % 10 == 1;
}