pixi-timer-events/src/TimerManager.ts

A type-based Entity Component System. Implemented in TypeScript

import Timer from './Timer';

export default class TimerManager{
	public timers: Timer[];

	private _timersToDelete: Timer[];
	private _last: number;
	constructor(){
		this.timers = [];
		this._timersToDelete = [];

		this._last = 0;
	}

	update(delta){
		let deltaMS;
		if(!delta && delta !== 0){
			deltaMS = this._getDeltaMS();
			delta = deltaMS/1000;
		}else{
			deltaMS = delta*1000;
		}

		for(let i = 0; i < this.timers.length; i++){
			let timer = this.timers[i];
			if(timer.active){
				timer.update(delta, deltaMS);
				if(timer.isEnded && timer.expire){
					timer.remove();
				}
			}
		}

		if(this._timersToDelete.length){
			for(let i = 0; i < this._timersToDelete.length; i++){
				this._remove(this._timersToDelete[i]);
			}
			this._timersToDelete.length = 0;
		}
	}

	removeTimer(timer){
		this._timersToDelete.push(timer);
	}

	addTimer(timer){
		timer.manager = this;
		this.timers.push(timer);
	}

	createTimer(time){
		return new Timer(time, this);
	}

	_remove(timer){
		let index = this.timers.indexOf(timer);
		if(index > 0)this.timers.splice(index, 1);
	}

	_getDeltaMS(){
		if(this._last === 0)this._last = Date.now();
		let now = Date.now();
		let deltaMS = now-this._last;
		this._last = now;
		return deltaMS;
	}
}