react-native/React/Base/RCTFrameUpdate.h

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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* 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>
@class CADisplayLink;
/**
* Interface containing the information about the last screen refresh.
*/
@interface RCTFrameUpdate : NSObject
/**
* Timestamp for the actual screen refresh
*/
@property (nonatomic, readonly) NSTimeInterval timestamp;
/**
* Time since the last frame update ( >= 16.6ms )
*/
@property (nonatomic, readonly) NSTimeInterval deltaTime;
- (instancetype)initWithDisplayLink:(CADisplayLink *)displayLink NS_DESIGNATED_INITIALIZER;
@end
/**
* Protocol that must be implemented for subscribing to display refreshes (DisplayLink updates)
*/
@protocol RCTFrameUpdateObserver <NSObject>
/**
* Method called on every screen refresh (if paused != YES)
*/
- (void)didUpdateFrame:(RCTFrameUpdate *)update;
/**
* Synthesize and set to true to pause the calls to -[didUpdateFrame:]
*/
@property (nonatomic, readonly, getter=isPaused) BOOL paused;
/**
* Callback for pause/resume observer.
* Observer should call it when paused property is changed.
*/
@property (nonatomic, copy) dispatch_block_t pauseCallback;
@end