98 lines
3.3 KiB
Objective-C
98 lines
3.3 KiB
Objective-C
//
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// SCCaptureFaceDetectorTrigger.m
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// Snapchat
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//
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// Created by Jiyang Zhu on 3/22/18.
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// Copyright © 2018 Snapchat, Inc. All rights reserved.
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//
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#import "SCCaptureFaceDetectorTrigger.h"
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#import "SCCaptureFaceDetector.h"
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#import <SCFoundation/SCAppLifecycle.h>
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#import <SCFoundation/SCIdleMonitor.h>
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#import <SCFoundation/SCQueuePerformer.h>
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#import <SCFoundation/SCTaskManager.h>
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#import <SCFoundation/SCTraceODPCompatible.h>
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@interface SCCaptureFaceDetectorTrigger () {
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id<SCCaptureFaceDetector> __weak _detector;
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}
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@end
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@implementation SCCaptureFaceDetectorTrigger
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- (instancetype)initWithDetector:(id<SCCaptureFaceDetector>)detector
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{
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self = [super init];
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if (self) {
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_detector = detector;
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(_applicationDidBecomeActive)
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name:kSCPostponedUIApplicationDidBecomeActiveNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(_applicationWillResignActive)
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name:UIApplicationWillResignActiveNotification
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object:nil];
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}
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return self;
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}
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#pragma mark - Internal Methods
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- (void)_applicationWillResignActive
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{
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SCTraceODPCompatibleStart(2);
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[self _stopDetection];
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}
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- (void)_applicationDidBecomeActive
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{
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SCTraceODPCompatibleStart(2);
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[self _waitUntilAppStartCompleteToStartDetection];
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}
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- (void)_waitUntilAppStartCompleteToStartDetection
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{
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SCTraceODPCompatibleStart(2);
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@weakify(self);
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if (SCExperimentWithWaitUntilIdleReplacement()) {
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[[SCTaskManager sharedManager] addTaskToRunWhenAppIdle:"SCCaptureFaceDetectorTrigger.startDetection"
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performer:[_detector detectionPerformer]
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block:^{
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@strongify(self);
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SC_GUARD_ELSE_RETURN(self);
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[self _startDetection];
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}];
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} else {
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[[SCIdleMonitor sharedInstance] waitUntilIdleForTag:"SCCaptureFaceDetectorTrigger.startDetection"
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callbackQueue:[_detector detectionPerformer].queue
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block:^{
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@strongify(self);
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SC_GUARD_ELSE_RETURN(self);
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[self _startDetection];
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}];
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}
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}
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- (void)_startDetection
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{
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SCTraceODPCompatibleStart(2);
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[[_detector detectionPerformer] performImmediatelyIfCurrentPerformer:^{
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[_detector startDetection];
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}];
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}
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- (void)_stopDetection
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{
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SCTraceODPCompatibleStart(2);
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[[_detector detectionPerformer] performImmediatelyIfCurrentPerformer:^{
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[_detector stopDetection];
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}];
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}
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@end
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