// @ts-nocheck
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import {raf, cancelRaf} from '../raf'
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export class Timeline {
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state : string
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animations : Set<Animation> = new Set<Animation>()
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delAnimations : Animation[] = []
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startTimes : Map<Animation, number> = new Map<Animation, number>()
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pauseTime : number = 0
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pauseStart : number = Date.now()
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tickHandler : number = 0
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tickHandlers : number[] = []
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tick : (() => void) | null = null
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constructor() {
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this.state = 'Initiated';
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}
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start() {
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if (!(this.state === 'Initiated')) return;
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this.state = 'Started';
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let startTime = Date.now();
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this.pauseTime = 0;
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this.tick = () => {
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let now = Date.now();
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this.animations.forEach((animation : Animation) => {
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let t:number;
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const ani = this.startTimes.get(animation)
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if (ani == null) return
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if (ani < startTime) {
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t = now - startTime - animation.delay - this.pauseTime;
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} else {
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t = now - ani - animation.delay - this.pauseTime;
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}
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if (t > animation.duration) {
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this.delAnimations.push(animation)
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// 不能在 foreach 里面 对 集合进行删除操作
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// this.animations.delete(animation);
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t = animation.duration;
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}
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if (t > 0) animation.run(t);
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})
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// 不能在 foreach 里面 对 集合进行删除操作
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while (this.delAnimations.length > 0) {
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const animation = this.delAnimations.pop();
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if (animation == null) return
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this.animations.delete(animation);
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}
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clearTimeout(this.tickHandler);
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if (this.state != 'Started') return
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// this.tickHandler = setTimeout(() => {
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// this.tick!()
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// }, 1000 / 60)
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this.tickHandler = raf(()=> {
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this.tick!()
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})
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// this.tickHandlers.push(this.tickHandler)
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}
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this.tick!()
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}
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pause() {
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if (!(this.state === 'Started')) return;
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this.state = 'Paused';
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this.pauseStart = Date.now();
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// clearTimeout(this.tickHandler);
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cancelRaf(this.tickHandler);
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}
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resume() {
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if (!(this.state === 'Paused')) return;
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this.state = 'Started';
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this.pauseTime += Date.now() - this.pauseStart;
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this.tick!();
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}
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reset() {
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this.pause();
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this.state = 'Initiated';
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this.pauseTime = 0;
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this.pauseStart = 0;
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this.animations.clear()
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this.delAnimations.clear()
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this.startTimes.clear()
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this.tickHandler = 0;
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}
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add(animation : Animation, startTime ?: number | null) {
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if (startTime == null) startTime = Date.now();
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this.animations.add(animation);
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this.startTimes.set(animation, startTime);
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}
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}
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export class Animation {
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startValue : number
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endValue : number
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duration : number
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timingFunction : (t : number) => number
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delay : number
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template : (t : number) => void
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constructor(
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startValue : number,
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endValue : number,
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duration : number,
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delay : number,
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timingFunction : (t : number) => number,
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template : (v : number) => void) {
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this.startValue = startValue;
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this.endValue = endValue;
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this.duration = duration;
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this.timingFunction = timingFunction;
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this.delay = delay;
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this.template = template;
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}
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run(time : number) {
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let range = this.endValue - this.startValue;
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let progress = time / this.duration
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if(progress != 1) progress = this.timingFunction(progress)
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this.template(this.startValue + range * progress)
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}
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}
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