react-native/React/Modules/RCTTiming.m

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/**
* 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 "RCTTiming.h"
#import "RCTAssert.h"
#import "RCTBridge.h"
#import "RCTBridge+Private.h"
#import "RCTLog.h"
#import "RCTUtils.h"
@interface RCTTimer : NSObject
@property (nonatomic, strong, readonly) NSDate *target;
@property (nonatomic, assign, readonly) BOOL repeats;
@property (nonatomic, copy, readonly) NSNumber *callbackID;
@property (nonatomic, assign, readonly) NSTimeInterval interval;
@end
@implementation RCTTimer
- (instancetype)initWithCallbackID:(NSNumber *)callbackID
interval:(NSTimeInterval)interval
targetTime:(NSTimeInterval)targetTime
repeats:(BOOL)repeats
{
if ((self = [super init])) {
_interval = interval;
_repeats = repeats;
_callbackID = callbackID;
_target = [NSDate dateWithTimeIntervalSinceNow:targetTime];
}
return self;
}
/**
* Returns `YES` if we should invoke the JS callback.
*/
- (BOOL)updateFoundNeedsJSUpdate
{
if (_target && _target.timeIntervalSinceNow <= 0) {
// The JS Timers will do fine grained calculating of expired timeouts.
_target = _repeats ? [NSDate dateWithTimeIntervalSinceNow:_interval] : nil;
return YES;
}
return NO;
}
@end
@implementation RCTTiming
{
NSMutableDictionary<NSNumber *, RCTTimer *> *_timers;
}
@synthesize bridge = _bridge;
@synthesize paused = _paused;
@synthesize pauseCallback = _pauseCallback;
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RCT_EXPORT_MODULE()
- (instancetype)init
{
if ((self = [super init])) {
_paused = YES;
_timers = [NSMutableDictionary new];
for (NSString *name in @[UIApplicationWillResignActiveNotification,
UIApplicationDidEnterBackgroundNotification,
UIApplicationWillTerminateNotification]) {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(stopTimers)
name:name
object:nil];
}
for (NSString *name in @[UIApplicationDidBecomeActiveNotification,
UIApplicationWillEnterForegroundNotification]) {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(startTimers)
name:name
object:nil];
}
}
return self;
}
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (dispatch_queue_t)methodQueue
{
return RCTJSThread;
}
- (void)invalidate
{
[self stopTimers];
_bridge = nil;
}
- (void)stopTimers
{
self.paused = YES;
}
- (void)startTimers
{
if (!_bridge || _timers.count == 0) {
return;
}
self.paused = NO;
}
- (void)setPaused:(BOOL)paused
{
if (_paused != paused) {
_paused = paused;
if (_pauseCallback) {
_pauseCallback();
}
}
}
- (void)didUpdateFrame:(__unused RCTFrameUpdate *)update
{
NSMutableArray<NSNumber *> *timersToCall = [NSMutableArray new];
for (RCTTimer *timer in _timers.allValues) {
if ([timer updateFoundNeedsJSUpdate]) {
[timersToCall addObject:timer.callbackID];
}
if (!timer.target) {
[_timers removeObjectForKey:timer.callbackID];
}
}
// call timers that need to be called
if (timersToCall.count > 0) {
[_bridge enqueueJSCall:@"JSTimersExecution.callTimers" args:@[timersToCall]];
}
if (_timers.count == 0) {
[self stopTimers];
}
}
/**
* There's a small difference between the time when we call
* setTimeout/setInterval/requestAnimation frame and the time it actually makes
* it here. This is important and needs to be taken into account when
* calculating the timer's target time. We calculate this by passing in
* Date.now() from JS and then subtracting that from the current time here.
*/
RCT_EXPORT_METHOD(createTimer:(nonnull NSNumber *)callbackID
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duration:(NSTimeInterval)jsDuration
jsSchedulingTime:(NSDate *)jsSchedulingTime
repeats:(BOOL)repeats)
{
if (jsDuration == 0 && repeats == NO) {
// For super fast, one-off timers, just enqueue them immediately rather than waiting a frame.
[_bridge _immediatelyCallTimer:callbackID];
return;
}
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NSTimeInterval jsSchedulingOverhead = -jsSchedulingTime.timeIntervalSinceNow;
if (jsSchedulingOverhead < 0) {
RCTLogWarn(@"jsSchedulingOverhead (%ims) should be positive", (int)(jsSchedulingOverhead * 1000));
/**
* Probably debugging on device, set to 0 so we don't ignore the interval
*/
jsSchedulingOverhead = 0;
}
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NSTimeInterval targetTime = jsDuration - jsSchedulingOverhead;
if (jsDuration < 0.018) { // Make sure short intervals run each frame
jsDuration = 0;
}
RCTTimer *timer = [[RCTTimer alloc] initWithCallbackID:callbackID
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interval:jsDuration
targetTime:targetTime
repeats:repeats];
_timers[callbackID] = timer;
[self startTimers];
}
RCT_EXPORT_METHOD(deleteTimer:(nonnull NSNumber *)timerID)
{
[_timers removeObjectForKey:timerID];
if (_timers.count == 0) {
[self stopTimers];
}
}
@end