react-native/React/Modules/RCTUIManagerObserverCoordinator.m
Valentin Shergin 712b1dd20a RCTUIManagerObserverCoordinator: new way to subscribe for granular notifications from UI Manager
Reviewed By: majak

Differential Revision: D4868591

fbshipit-source-id: 24a09ffa3e69dec5ce1f0a8715c7e4701d781996
2017-05-08 12:52:09 -07:00

71 lines
1.8 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 "RCTUIManagerObserverCoordinator.h"
#import "RCTUIManager.h"
@implementation RCTUIManagerObserverCoordinator {
NSHashTable<id<RCTUIManagerObserver>> *_observers;
}
- (instancetype)init
{
if (self = [super init]) {
_observers = [[NSHashTable alloc] initWithOptions:NSHashTableWeakMemory capacity:0];
}
return self;
}
- (void)addObserver:(id<RCTUIManagerObserver>)observer
{
dispatch_async(RCTGetUIManagerQueue(), ^{
[self->_observers addObject:observer];
});
}
- (void)removeObserver:(id<RCTUIManagerObserver>)observer
{
dispatch_async(RCTGetUIManagerQueue(), ^{
[self->_observers removeObject:observer];
});
}
#pragma mark - RCTUIManagerObserver
- (void)uiManagerWillPerformLayout:(RCTUIManager *)manager
{
for (id<RCTUIManagerObserver> observer in _observers) {
if ([observer respondsToSelector:@selector(uiManagerWillPerformLayout:)]) {
[observer uiManagerWillPerformLayout:manager];
}
}
}
- (void)uiManagerDidPerformLayout:(RCTUIManager *)manager
{
for (id<RCTUIManagerObserver> observer in _observers) {
if ([observer respondsToSelector:@selector(uiManagerDidPerformLayout:)]) {
[observer uiManagerDidPerformLayout:manager];
}
}
}
- (void)uiManagerWillFlushUIBlocks:(RCTUIManager *)manager
{
for (id<RCTUIManagerObserver> observer in _observers) {
if ([observer respondsToSelector:@selector(uiManagerWillFlushUIBlocks:)]) {
[observer uiManagerWillFlushUIBlocks:manager];
}
}
}
@end