75 lines
2.4 KiB
Objective-C
75 lines
2.4 KiB
Objective-C
/**
|
|
* Copyright (c) 2015-present, Facebook, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This source code is licensed under the BSD-style license found in the
|
|
* LICENSE file in the root directory of this source tree. An additional grant
|
|
* of patent rights can be found in the PATENTS file in the same directory.
|
|
*/
|
|
|
|
#import <UIKit/UIKit.h>
|
|
|
|
#import <React/RCTViewManager.h>
|
|
|
|
/**
|
|
* Allows hooking into UIManager internals. This can be used to execute code at
|
|
* specific points during the view updating process.
|
|
* New observers must not be added inside observer handlers.
|
|
* The particular order of handler invocation is not guaranteed.
|
|
* All observer handlers are called on UIManager queue.
|
|
*/
|
|
@protocol RCTUIManagerObserver <NSObject>
|
|
|
|
@optional
|
|
|
|
/**
|
|
* Called just before the UIManager layout views.
|
|
* It allows performing some operation for components which contain custom
|
|
* layout logic right before regular Yoga based layout. So, for instance,
|
|
* some components which have own React-independent state can compute and cache
|
|
* own intrinsic content size (which will be used by Yoga) at this point.
|
|
*/
|
|
- (void)uiManagerWillPerformLayout:(RCTUIManager *)manager;
|
|
|
|
/**
|
|
* Called just after the UIManager layout views.
|
|
* It allows performing custom layout logic right after regular Yoga based layout.
|
|
* So, for instance, this can be used for computing final layout for a component,
|
|
* since it has its final frame set by Yoga at this point.
|
|
*/
|
|
- (void)uiManagerDidPerformLayout:(RCTUIManager *)manager;
|
|
|
|
/**
|
|
* Called before flushing UI blocks at the end of a batch.
|
|
* This is called from the UIManager queue. Can be used to add UI operations in that batch.
|
|
*/
|
|
- (void)uiManagerWillPerformMounting:(RCTUIManager *)manager;
|
|
|
|
/**
|
|
* Called just after flushing UI blocks.
|
|
* This is called from the UIManager queue.
|
|
*/
|
|
- (void)uiManagerDidPerformMounting:(RCTUIManager *)manager;
|
|
|
|
@end
|
|
|
|
/**
|
|
* Simple helper which take care of RCTUIManager's observers.
|
|
*/
|
|
@interface RCTUIManagerObserverCoordinator : NSObject <RCTUIManagerObserver>
|
|
|
|
/**
|
|
* Add a UIManagerObserver. See the `RCTUIManagerObserver` protocol for more info.
|
|
* References to observers are held weakly.
|
|
* This method can be called safely from any queue.
|
|
*/
|
|
- (void)addObserver:(id<RCTUIManagerObserver>)observer;
|
|
|
|
/**
|
|
* Remove a `UIManagerObserver`.
|
|
* This method can be called safely from any queue.
|
|
*/
|
|
- (void)removeObserver:(id<RCTUIManagerObserver>)observer;
|
|
|
|
@end
|