82 lines
2.6 KiB
Objective-C
82 lines
2.6 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/RCTViewManager.h>
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typedef dispatch_block_t RCTUIManagerMountingBlock;
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/**
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* Allows hooking into UIManager internals. This can be used to execute code at
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* specific points during the view updating process.
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* New observers must not be added inside observer handlers.
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* The particular order of handler invocation is not guaranteed.
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* All observer handlers are called on UIManager queue.
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*/
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@protocol RCTUIManagerObserver <NSObject>
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@optional
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/**
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* Called just before the UIManager layout views.
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* It allows performing some operation for components which contain custom
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* layout logic right before regular Yoga based layout. So, for instance,
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* some components which have own React-independent state can compute and cache
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* own intrinsic content size (which will be used by Yoga) at this point.
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*/
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- (void)uiManagerWillPerformLayout:(RCTUIManager *)manager;
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/**
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* Called just after the UIManager layout views.
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* It allows performing custom layout logic right after regular Yoga based layout.
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* So, for instance, this can be used for computing final layout for a component,
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* since it has its final frame set by Yoga at this point.
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*/
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- (void)uiManagerDidPerformLayout:(RCTUIManager *)manager;
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/**
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* Called before flushing UI blocks at the end of a batch.
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* This is called from the UIManager queue. Can be used to add UI operations in that batch.
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*/
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- (void)uiManagerWillPerformMounting:(RCTUIManager *)manager;
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/**
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* Called right before flushing UI blocks and allows to intercept the mounting process.
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* Return `YES` to cancel default execution of the `block` (and perform the
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* execution later).
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*/
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- (BOOL)uiManager:(RCTUIManager *)manager performMountingWithBlock:(RCTUIManagerMountingBlock)block;
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/**
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* Called just after flushing UI blocks.
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* This is called from the UIManager queue.
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*/
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- (void)uiManagerDidPerformMounting:(RCTUIManager *)manager;
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@end
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/**
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* Simple helper which take care of RCTUIManager's observers.
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*/
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@interface RCTUIManagerObserverCoordinator : NSObject <RCTUIManagerObserver>
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/**
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* Add a UIManagerObserver. See the `RCTUIManagerObserver` protocol for more info.
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* References to observers are held weakly.
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* This method can be called safely from any queue.
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*/
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- (void)addObserver:(id<RCTUIManagerObserver>)observer;
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/**
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* Remove a `UIManagerObserver`.
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* This method can be called safely from any queue.
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*/
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- (void)removeObserver:(id<RCTUIManagerObserver>)observer;
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@end
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