Class AnimationFrameTicker

src/Timer.ts:59–84

}

export class AnimationFrameTicker implements ITicker {
  private _rafid: number = 0
  private _cb: TickerCallback | null = null

  public get running(): boolean { return this._rafid != 0 }

  private _tick() {
    if (this._cb) { this._cb() }
    if (this._rafid) {
      this._rafid = requestAnimationFrame(this._tick.bind(this))
    }
  }
  public start(cb: TickerCallback): void {
    this.stop()
    this._cb = cb
    this._rafid = requestAnimationFrame(this._tick.bind(this))
  }
  public stop(): void {
    if (this._rafid) {
      cancelAnimationFrame(this._rafid)
      this._rafid = 0
    }
    this._cb = null
  }
  public now(): number { return performance.now() }
}

const TIMESCALE_MIN = 0, TIMESCALE_MAX = 5