关于macOS替代品之CADisplayLink

// See: https://developer.apple.com/documentation/quartzcore/cadisplaylinkpublicprotocolDisplayLinkProtocol:NSObjectProtocol{/// 每帧之间的时间，60HZ的刷新率为每秒60次，每次刷新需要1/60秒，大约16.7毫秒varduration:CFTimeInterval{get}/// 返回每个帧之间的时间，即每个屏幕刷新之间的时间间隔vartimestamp:CFTimeInterval{get}/// 定义每次之间必须传递多少个显示帧varframeInterval:Int{get}/// 是否处于暂停状态varisPaused:Bool{getset}/// 使用您指定的目标和选择器创建显示链接/// 将在“target”上调用名为“sel”的方法，该方法对应``(void)selector:(CADisplayLink *)sender``init(target:Any,selectorsel:Selector)/// 将接收器添加到给定的运行循环和模式中funcadd(torunloop:RunLoop,forModemode:RunLoop.Mode)/// 从运行循环的给定模式中移除接收器funcremove(fromrunloop:RunLoop,forModemode:RunLoop.Mode)/// 销毁计时器，并释放“目标”对象funcinvalidate()}

////  CADisplayLink.swift//  Harbeth////  Created by Condy on 2023/1/6.//importFoundation#ifos(macOS)importAppKitpublictypealiasCADisplayLink=Harbeth.DisplayLink// See: https://developer.apple.com/documentation/quartzcore/cadisplaylinkpublicprotocolDisplayLinkProtocol:NSObjectProtocol{/// The refresh rate of 60HZ is 60 times per second, each refresh takes 1/60 of a second about 16.7 milliseconds.varduration:CFTimeInterval{get}/// Returns the time between each frame, that is, the time interval between each screen refresh.vartimestamp:CFTimeInterval{get}/// Sets how many frames between calls to the selector method, defult 1varframeInterval:Int{get}/// A Boolean value that indicates whether the system suspends the display link’s notifications to the target.varisPaused:Bool{getset}/// Creates a display link with the target and selector you specify./// It will invoke the method called `sel` on `target`, the method has the signature ``(void)selector:(CADisplayLink *)sender``./// - Parameters:///   - target: An object the system notifies to update the screen.///   - sel: The method to call on the target.init(target:Any,selectorsel:Selector)/// Adds the receiver to the given run-loop and mode./// - Parameters:///   - runloop: The run loop to associate with the display link.///   - mode: The mode in which to add the display link to the run loop.funcadd(torunloop:RunLoop,forModemode:RunLoop.Mode)/// 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./// - Parameters:///   - runloop: The run loop to associate with the display link.///   - mode: The mode in which to remove the display link to the run loop.funcremove(fromrunloop:RunLoop,forModemode:RunLoop.Mode)/// Removes the object from all runloop modes and releases the `target` object.funcinvalidate()}/// Analog to the CADisplayLink in iOS.publicfinalclassDisplayLink:NSObject,DisplayLinkProtocol{// This is the value of CADisplayLink.privatestaticletduration=0.016666667privatestaticletframeInterval=1privatestaticlettimestamp=0.0// 该值随时会变，就取个开始值吧!privatelettarget:Anyprivateletselector:SelectorprivateletselParameterNumbers:Intprivatelettimer:CVDisplayLink?privatevarsource:DispatchSourceUserDataAdd?privatevartimeStampRef:CVTimeStamp=CVTimeStamp()/// Use this callback when the Selector parameter exceeds 1.publicvarcallback:Optional<(_displayLink:DisplayLink)->()>=nil/// The refresh rate of 60HZ is 60 times per second, each refresh takes 1/60 of a second about 16.7 milliseconds.publicvarduration:CFTimeInterval{guardlettimer=timerelse{returnDisplayLink.duration}CVDisplayLinkGetCurrentTime(timer,&timeStampRef)returnCFTimeInterval(timeStampRef.videoRefreshPeriod)/CFTimeInterval(timeStampRef.videoTimeScale)}/// Returns the time between each frame, that is, the time interval between each screen refresh.publicvartimestamp:CFTimeInterval{guardlettimer=timerelse{returnDisplayLink.timestamp}CVDisplayLinkGetCurrentTime(timer,&timeStampRef)returnCFTimeInterval(timeStampRef.videoTime)/CFTimeInterval(timeStampRef.videoTimeScale)}/// Sets how many frames between calls to the selector method, defult 1publicvarframeInterval:Int{guardlettimer=timerelse{returnDisplayLink.frameInterval}CVDisplayLinkGetCurrentTime(timer,&timeStampRef)returnInt(timeStampRef.rateScalar)}publicinit(target:Any,selectorsel:Selector){self.target=targetself.selector=selself.selParameterNumbers=DisplayLink.selectorParameterNumbers(sel)vartimerRef:CVDisplayLink?=nilCVDisplayLinkCreateWithActiveCGDisplays(&timerRef)self.timer=timerRef}publicfuncadd(torunloop:RunLoop,forModemode:RunLoop.Mode){iflet_=self.source{return}self.source=createSource(with:runloop)}publicfuncremove(fromrunloop:RunLoop,forModemode:RunLoop.Mode){self.cancel()self.source=nil}publicvarisPaused:Bool=false{didSet{isPaused?suspend():start()}}publicfuncinvalidate(){cancel()}deinit{ifrunning(){cancel()}}}extensionDisplayLink{/// Get the number of parameters contained in the Selector method.privateclassfuncselectorParameterNumbers(_sel:Selector)->Int{varnumber:Int=0forxinsel.descriptionwherex==":"{number+=1}returnnumber}/// Starts the timer.privatefuncstart(){guard!running(),lettimer=timerelse{return}CVDisplayLinkStart(timer)ifsource?.isCancelled??false{source?.activate()}else{source?.resume()}}/// Suspend the timer.privatefuncsuspend(){guardrunning(),lettimer=timerelse{return}CVDisplayLinkStop(timer)source?.suspend()}/// Cancels the timer, can be restarted aftewards.privatefunccancel(){guardrunning(),lettimer=timerelse{return}CVDisplayLinkStop(timer)ifsource?.isCancelled??false{return}source?.cancel()}privatefuncrunning()->Bool{guardlettimer=timerelse{returnfalse}returnCVDisplayLinkIsRunning(timer)}privatefunccreateSource(withrunloop:RunLoop)->DispatchSourceUserDataAdd?{guardlettimer=timerelse{returnnil}letqueue:DispatchQueue=runloop==RunLoop.main?.main:.global()letsource=DispatchSource.makeUserDataAddSource(queue:queue)varsuccessLink=CVDisplayLinkSetOutputCallback(timer,{(_,_,_,_,_,pointer)->CVReturninifletsourceUnsafeRaw=pointer{letsourceUnmanaged=Unmanaged<DispatchSourceUserDataAdd>.fromOpaque(sourceUnsafeRaw)sourceUnmanaged.takeUnretainedValue().add(data:1)}returnkCVReturnSuccess},Unmanaged.passUnretained(source).toOpaque())guardsuccessLink==kCVReturnSuccesselse{returnnil}successLink=CVDisplayLinkSetCurrentCGDisplay(timer,CGMainDisplayID())guardsuccessLink==kCVReturnSuccesselse{returnnil}// Timer setupsource.setEventHandler(handler:{[weakself]inguardlet`self`=self,lettarget=self.targetas?NSObjectProtocolelse{return}switchself.selParameterNumbers{case0whereself.selector.description.isEmpty==false:target.perform(self.selector)case1:target.perform(self.selector,with:self)default:self.callback?(self)break}})returnsource}}#endif