mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Marcus Zarra
30790be1b5
Summary: In working to remove dead code from the code base, we identified that a number of classes that subclassed `RCTEventEmitter` were being reported as unused when they are in active use. That was due to a lack of a `[super initialize]`. This diff adds the call to super. Changelog: [General] [Added] - Call to `super` in `+initialize` of `RCTEventEmitter` Reviewed By: javache Differential Revision: D19727783 fbshipit-source-id: 19c6c7f08e7a8b2f764988fdfcd70f92dbf1b74b
104 lines
2.7 KiB
Objective-C
104 lines
2.7 KiB
Objective-C
/*
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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 "RCTEventEmitter.h"
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#import "RCTAssert.h"
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#import "RCTUtils.h"
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#import "RCTLog.h"
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@implementation RCTEventEmitter
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{
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NSInteger _listenerCount;
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}
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@synthesize invokeJS = _invokeJS;
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+ (NSString *)moduleName
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{
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return @"";
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}
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+ (void)initialize
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{
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[super initialize];
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if (self != [RCTEventEmitter class]) {
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RCTAssert(RCTClassOverridesInstanceMethod(self, @selector(supportedEvents)),
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@"You must override the `supportedEvents` method of %@", self);
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}
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}
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- (NSArray<NSString *> *)supportedEvents
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{
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return nil;
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}
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- (void)sendEventWithName:(NSString *)eventName body:(id)body
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{
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RCTAssert(_bridge != nil || _invokeJS != nil, @"Error when sending event: %@ with body: %@. "
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"Bridge is not set. This is probably because you've "
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"explicitly synthesized the bridge in %@, even though it's inherited "
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"from RCTEventEmitter.", eventName, body, [self class]);
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if (RCT_DEBUG && ![[self supportedEvents] containsObject:eventName]) {
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RCTLogError(@"`%@` is not a supported event type for %@. Supported events are: `%@`",
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eventName, [self class], [[self supportedEvents] componentsJoinedByString:@"`, `"]);
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}
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if (_listenerCount > 0 && _bridge) {
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[_bridge enqueueJSCall:@"RCTDeviceEventEmitter"
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method:@"emit"
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args:body ? @[eventName, body] : @[eventName]
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completion:NULL];
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} else if (_listenerCount > 0 && _invokeJS) {
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_invokeJS(@"RCTDeviceEventEmitter", @"emit", body ? @[eventName, body] : @[eventName]);
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} else {
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RCTLogWarn(@"Sending `%@` with no listeners registered.", eventName);
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}
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}
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- (void)startObserving
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{
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// Does nothing
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}
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- (void)stopObserving
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{
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// Does nothing
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}
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- (void)dealloc
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{
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if (_listenerCount > 0) {
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[self stopObserving];
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}
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}
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RCT_EXPORT_METHOD(addListener:(NSString *)eventName)
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{
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if (RCT_DEBUG && ![[self supportedEvents] containsObject:eventName]) {
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RCTLogError(@"`%@` is not a supported event type for %@. Supported events are: `%@`",
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eventName, [self class], [[self supportedEvents] componentsJoinedByString:@"`, `"]);
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}
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_listenerCount++;
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if (_listenerCount == 1) {
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[self startObserving];
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}
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}
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RCT_EXPORT_METHOD(removeListeners:(double)count)
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{
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int currentCount = (int)count;
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if (RCT_DEBUG && currentCount > _listenerCount) {
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RCTLogError(@"Attempted to remove more %@ listeners than added", [self class]);
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}
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_listenerCount = MAX(_listenerCount - currentCount, 0);
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if (_listenerCount == 0) {
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[self stopObserving];
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}
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}
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@end
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