mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Ramanpreet Nara
8dded42b68
Summary:
# Context
ScrollView sticky headers rely on this bit of code to work:
```
AnimatedImplementation.attachNativeEvent(
this._scrollViewRef,
'onScroll',
[{nativeEvent: {contentOffset: {y: this._scrollAnimatedValue}}}],
);
```
What this code means:
When the ScrollView host component receives the "onScroll" event, assign event.nativeEvent.contentOffSet.y to the this._scrollAnimatedValue AnimatedValue.
How this subscription mechanism is set up:
NativeAnimatedTurboModule subscribes to events dispatched by RCTEventDispatcher sendEvent. Then, whenever RCTEventEmitter sendEvent executes, NativeAnimatedTurboModule also updates the AnimatedValue for that event.
# Problem
Previously, in bridgeless, we started dispatching RCTScrollView via the RCTEventDispatcher sendEvent to update the AnimatedValue for ScrollView. This meant that we started dispatching the onScroll event to JavaScript via RCTEventEmitter.receiveEvent JSModule, which isn't supported in the Fabric renderer.
With this diff, we dialed back that solution. Instead of (1) notifying NativeAnimatedTurboModule and (2) sending the onScroll event to JavaScript, we're only doing (1) (i.e: notifying NativeAnimatedTurboModule).
Changelog: [Internal]
Reviewed By: fkgozali
Differential Revision: D37257719
fbshipit-source-id: 7dea3cf8b9ae78f6b0fd40414b8f224d43367a5a
135 lines
3.5 KiB
Objective-C
135 lines
3.5 KiB
Objective-C
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import <UIKit/UIKit.h>
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#import <React/RCTBridge.h>
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/**
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* The threshold at which text inputs will start warning that the JS thread
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* has fallen behind (resulting in poor input performance, missed keys, etc.)
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*/
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RCT_EXTERN const NSInteger RCTTextUpdateLagWarningThreshold;
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/**
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* Takes an input event name and normalizes it to the form that is required
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* by the events system (currently that means starting with the "top" prefix,
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* but that's an implementation detail that may change in future).
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*/
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RCT_EXTERN NSString *RCTNormalizeInputEventName(NSString *eventName);
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typedef NS_ENUM(NSInteger, RCTTextEventType) {
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RCTTextEventTypeFocus,
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RCTTextEventTypeBlur,
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RCTTextEventTypeChange,
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RCTTextEventTypeSubmit,
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RCTTextEventTypeEnd,
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RCTTextEventTypeKeyPress
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};
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@protocol RCTEvent <NSObject>
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@required
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@property (nonatomic, strong, readonly) NSNumber *viewTag;
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@property (nonatomic, copy, readonly) NSString *eventName;
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- (BOOL)canCoalesce;
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/** used directly for doing a JS call */
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+ (NSString *)moduleDotMethod;
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/** must contain only JSON compatible values */
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- (NSArray *)arguments;
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@optional
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/**
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* Coalescing related methods must only be implemented if canCoalesce
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* returns YES.
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*/
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@property (nonatomic, assign, readonly) uint16_t coalescingKey;
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- (id<RCTEvent>)coalesceWithEvent:(id<RCTEvent>)newEvent;
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@end
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/**
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* This protocol allows observing events dispatched by RCTEventDispatcher.
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*/
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@protocol RCTEventDispatcherObserver <NSObject>
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/**
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* Called before dispatching an event, on the same thread the event was
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* dispatched from.
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*/
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- (void)eventDispatcherWillDispatchEvent:(id<RCTEvent>)event;
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@end
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@protocol RCTJSDispatcherModule
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@property (nonatomic, copy) void (^dispatchToJSThread)(dispatch_block_t block);
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@end
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/**
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* This class wraps the -[RCTBridge enqueueJSCall:args:] method, and
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* provides some convenience methods for generating event calls.
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*/
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@protocol RCTEventDispatcherProtocol <RCTBridgeModule, RCTJSDispatcherModule>
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- (void)sendViewEventWithName:(NSString *)name reactTag:(NSNumber *)reactTag;
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/**
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* Deprecated, do not use.
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*/
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- (void)sendAppEventWithName:(NSString *)name body:(id)body __deprecated_msg("Subclass RCTEventEmitter instead");
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/**
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* Deprecated, do not use.
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*/
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- (void)sendDeviceEventWithName:(NSString *)name body:(id)body __deprecated_msg("Subclass RCTEventEmitter instead");
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/**
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* Send a text input/focus event. For internal use only.
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*/
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- (void)sendTextEventWithType:(RCTTextEventType)type
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reactTag:(NSNumber *)reactTag
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text:(NSString *)text
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key:(NSString *)key
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eventCount:(NSInteger)eventCount;
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/**
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* Notify Observers of event
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*/
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- (void)notifyObserversOfEvent:(id<RCTEvent>)event;
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/**
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* Send a pre-prepared event object.
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*
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* Events are sent to JS as soon as the thread is free to process them.
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* If an event can be coalesced and there is another compatible event waiting, the coalescing will happen immediately.
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*/
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- (void)sendEvent:(id<RCTEvent>)event;
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/**
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* Add an event dispatcher observer.
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*/
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- (void)addDispatchObserver:(id<RCTEventDispatcherObserver>)observer;
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/**
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* Remove an event dispatcher observer.
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*/
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- (void)removeDispatchObserver:(id<RCTEventDispatcherObserver>)observer;
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@end
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@interface RCTBridge (RCTEventDispatcher)
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- (id<RCTEventDispatcherProtocol>)eventDispatcher;
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@end
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