95 строки
1.8 KiB
Plaintext
95 строки
1.8 KiB
Plaintext
/*
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* Copyright (c) Facebook, Inc. and its 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 "RCTGenericDelegateSplitter.h"
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@implementation RCTGenericDelegateSplitter {
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NSHashTable *_delegates;
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}
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#pragma mark - Public
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- (instancetype)initWithDelegateUpdateBlock:(void (^)(id _Nullable delegate))block
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{
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if (self = [super init]) {
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_delegateUpdateBlock = block;
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_delegates = [NSHashTable weakObjectsHashTable];
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}
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return self;
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}
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- (void)addDelegate:(id)delegate
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{
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[_delegates addObject:delegate];
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[self _updateDelegate];
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}
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- (void)removeDelegate:(id)delegate
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{
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[_delegates removeObject:delegate];
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[self _updateDelegate];
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}
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- (void)removeAllDelegates
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{
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[_delegates removeAllObjects];
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[self _updateDelegate];
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}
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#pragma mark - Private
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- (void)_updateDelegate
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{
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_delegateUpdateBlock(nil);
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if (_delegates.count == 0) {
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return;
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}
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_delegateUpdateBlock(_delegates.count == 1 ? [_delegates allObjects].firstObject : self);
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}
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#pragma mark - Fast Forwarding
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- (BOOL)respondsToSelector:(SEL)selector
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{
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for (id delegate in _delegates) {
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if ([delegate respondsToSelector:selector]) {
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return YES;
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}
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}
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return NO;
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}
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- (NSMethodSignature *)methodSignatureForSelector:(SEL)selector
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{
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for (id delegate in _delegates) {
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if ([delegate respondsToSelector:selector]) {
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return [delegate methodSignatureForSelector:selector];
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}
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}
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return nil;
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}
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- (void)forwardInvocation:(NSInvocation *)invocation
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{
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NSMutableArray *targets = [[NSMutableArray alloc] initWithCapacity:_delegates.count];
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for (id delegate in _delegates) {
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if ([delegate respondsToSelector:[invocation selector]]) {
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[targets addObject:delegate];
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}
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}
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for (id target in targets) {
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[invocation invokeWithTarget:target];
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}
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}
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@end
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