Class ITween

src/scripting/api/Tween/Tween.ts:14–142

  type ValueListMap = {[prop:string]: Array<number>};

  export class ITween {
    private _target:any = null;
    private _duration:number;
    private _isPlaying:boolean = false;
    private _currentTime:number = 0;
    private _repeats:number = 0;
    private _timeKeeper:Runtime.TimeKeeper;
    private _timer:Runtime.Timer;
    public easing:Function = Tween.linear;
    public step:Function = () => {};

    constructor(target:any, duration:number = 0) {
      this._target = target;
      this._duration = duration;
      this._timeKeeper = new Runtime.TimeKeeper();
      this._timer = new Runtime.Timer(40);

      // Timer related
      var self:ITween = this;
      this._timer.addEventListener("timer", () => {
        self._onTimerEvent();
      });
    }

    private _onTimerEvent():void {
      // Ignore all the timer events if we're not playing
      if (this._isPlaying) {
        this._currentTime += this._timeKeeper.elapsed;
        this._timeKeeper.reset();
        this.step(this._target, this._currentTime, this._duration);
        if (this._currentTime >= this._duration) {
          this._repeats--;
          if (this._repeats < 0) {
            this.stop();
            this._currentTime = this._duration;
          } else {
            this._currentTime = 0;
          }
          this.step(this._target, this._currentTime, this._duration);
        }
      }
    }

    set duration(dur:number) {
      this._duration = dur;
    }

    get duration():number {
      return this._duration;
    }

    set position(position:number) {
      this._currentTime = position;
    }

    get position():number {
      return this._currentTime;
    }