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| Original file line number | Diff line number | Diff line change |
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| // | ||
| // RCTDisplayLink.h | ||
| // React | ||
| // | ||
| // Created by Stanislav Vishnevskiy on 6/8/15. | ||
| // Copyright (c) 2015 Facebook. All rights reserved. | ||
| // | ||
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| #import <QuartzCore/CABase.h> | ||
| #import <Foundation/NSObject.h> | ||
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| @class NSString, NSRunLoop; | ||
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| @interface DCDDisplayLink : NSObject | ||
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| /* Create a new display link object for the main display. It will | ||
| * invoke the method called 'sel' on 'target', the method has the | ||
| * signature '(void)selector:(CADisplayLink *)sender'. */ | ||
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| + (DCDDisplayLink *)displayLinkWithTarget:(id)target selector:(SEL)sel; | ||
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| /* Adds the receiver to the given run-loop and mode. Unless paused, it | ||
| * will fire every vsync until removed. Each object may only be added | ||
| * to a single run-loop, but it may be added in multiple modes at once. | ||
| * While added to a run-loop it will implicitly be retained. */ | ||
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| - (void)addToRunLoop:(NSRunLoop *)runloop forMode:(NSString *)mode; | ||
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| /* Removes the receiver from the given mode of the runloop. This will | ||
| * implicitly release it when removed from the last mode it has been | ||
| * registered for. */ | ||
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| - (void)removeFromRunLoop:(NSRunLoop *)runloop forMode:(NSString *)mode; | ||
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| /* Removes the object from all runloop modes (releasing the receiver if | ||
| * it has been implicitly retained) and releases the 'target' object. */ | ||
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| - (void)invalidate; | ||
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| /* The current time, and duration of the display frame associated with | ||
| * the most recent target invocation. Time is represented using the | ||
| * normal Core Animation conventions, i.e. Mach host time converted to | ||
| * seconds. */ | ||
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| @property(readonly, nonatomic) CFTimeInterval timestamp; | ||
| @property(readonly, nonatomic) CFTimeInterval duration; | ||
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| /* When true the object is prevented from firing. Initial state is | ||
| * false. */ | ||
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| @property(getter=isPaused, nonatomic) BOOL paused; | ||
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| /* Defines how many display frames must pass between each time the | ||
| * display link fires. Default value is one, which means the display | ||
| * link will fire for every display frame. Setting the interval to two | ||
| * will cause the display link to fire every other display frame, and | ||
| * so on. The behavior when using values less than one is undefined. */ | ||
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| @property(nonatomic) NSInteger frameInterval; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
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| // | ||
| // RCTDisplayLink.m | ||
| // React | ||
| // | ||
| // Created by Stanislav Vishnevskiy on 6/8/15. | ||
| // Copyright (c) 2015 Facebook. All rights reserved. | ||
| // | ||
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| #import "DCDDisplayLink.h" | ||
| #import <UIKit/UIKit.h> | ||
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| @interface DCDDisplayLink () | ||
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| @property(nonatomic) NSRunLoop *runloop; | ||
| @property(nonatomic) NSString *mode; | ||
| @property(nonatomic) id target; | ||
| @property(nonatomic) SEL selector; | ||
| @property(nonatomic) NSTimer *timer; | ||
| @property(nonatomic) CADisplayLink *displayLink; | ||
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| // CADisplayLink is not thread safe. | ||
| // Add a flag to avoid the crash of removing invalidated CADisplayLink from the run loop. | ||
| @property(nonatomic) BOOL resourcesLoaded; | ||
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| @end | ||
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| @implementation DCDDisplayLink | ||
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| + (DCDDisplayLink *)displayLinkWithTarget:(id)target selector:(SEL)sel { | ||
| return [[self alloc] initWithTarget:target selector:sel]; | ||
| } | ||
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| - (instancetype)initWithTarget:(id)target selector:(SEL)sel { | ||
| if (self = [super init]) { | ||
| _target = target; | ||
| _selector = sel; | ||
| _displayLink = [CADisplayLink displayLinkWithTarget:target selector:sel]; | ||
| _resourcesLoaded = YES; | ||
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| [[NSNotificationCenter defaultCenter] addObserver:self | ||
| selector:@selector(switchToTimer) | ||
| name:UIApplicationDidEnterBackgroundNotification | ||
| object:nil]; | ||
| [[NSNotificationCenter defaultCenter] addObserver:self | ||
| selector:@selector(switchToDisplayLink) | ||
| name:UIApplicationWillEnterForegroundNotification | ||
| object:nil]; | ||
| } | ||
| return self; | ||
| } | ||
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| - (void)dealloc { | ||
| [[NSNotificationCenter defaultCenter] removeObserver:self]; | ||
| } | ||
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| - (void)switchToDisplayLink { | ||
| if (_timer) { | ||
| [_timer invalidate]; | ||
| _timer = nil; | ||
| [self setPaused:_paused]; | ||
| if (_runloop) { | ||
| [_displayLink addToRunLoop:_runloop forMode:_mode]; | ||
| } | ||
| } | ||
| } | ||
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| - (void)switchToTimer { | ||
| if (!_timer) { | ||
| [self maybeResetTimer]; | ||
| [self setPaused:_paused]; | ||
| if (_runloop && _resourcesLoaded) { | ||
| [_displayLink removeFromRunLoop:_runloop forMode:_mode]; | ||
| [_runloop addTimer:_timer forMode:_mode]; | ||
| } | ||
| } | ||
| } | ||
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| - (void)addToRunLoop:(NSRunLoop *)runloop forMode:(NSString *)mode { | ||
| _runloop = runloop; | ||
| _mode = mode; | ||
| if (_timer) { | ||
| [self maybeResetTimer]; | ||
| [runloop addTimer:_timer forMode:mode]; | ||
| } | ||
| else { | ||
| [_displayLink addToRunLoop:runloop forMode:mode]; | ||
| } | ||
| } | ||
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| - (void)removeFromRunLoop:(NSRunLoop *)runloop forMode:(NSString *)mode { | ||
| _runloop = nil; | ||
| _mode = nil; | ||
| if (_timer) { | ||
| [_timer invalidate]; | ||
| } | ||
| else { | ||
| [_displayLink removeFromRunLoop:runloop forMode:mode]; | ||
| } | ||
| } | ||
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| - (void)invalidate { | ||
| _resourcesLoaded = NO; | ||
| if (_timer) { | ||
| [_timer invalidate]; | ||
| } | ||
| else { | ||
| [_displayLink invalidate]; | ||
| } | ||
| } | ||
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| - (void)setPaused:(BOOL)paused { | ||
| _paused = paused; | ||
| if (_timer) { | ||
| if (paused) { | ||
| [_timer invalidate]; | ||
| } | ||
| else { | ||
| [self maybeResetTimer]; | ||
| if (_runloop) { | ||
| [_runloop addTimer:_timer forMode:_mode]; | ||
| } | ||
| } | ||
| } | ||
| else { | ||
| _displayLink.paused = paused; | ||
| } | ||
| } | ||
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| - (CFTimeInterval)timestamp { | ||
| if (_timer) { | ||
| // TODO: Does React Native actually need this? | ||
| return 0; | ||
| } | ||
| return _displayLink.timestamp; | ||
| } | ||
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| - (CFTimeInterval)duration { | ||
| if (_timer) { | ||
| // TODO: Does React Native actually need this? | ||
| return 0; | ||
| } | ||
| return _displayLink.duration; | ||
| } | ||
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| - (void)maybeResetTimer { | ||
| if (!_timer || ![_timer isValid]) { | ||
| _timer = [NSTimer timerWithTimeInterval:1 target:self selector:@selector(timerLoop) userInfo:nil repeats:YES]; | ||
| } | ||
| } | ||
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| - (void)timerLoop { | ||
| if (_target) { | ||
| IMP imp = [_target methodForSelector:_selector]; | ||
| void (*func)(id, SEL, DCDDisplayLink *) = (void *)imp; | ||
| func(_target, _selector, self); | ||
| } | ||
| } | ||
|
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| @end |
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