quick sticky method

sticky item

/**
 * Set sticky
 */
setSticky() {
  if(!this.item) return;

  const bounds = this.item.getBoundingClientRect();
  const boundsTop = bounds.top < 0 ? bounds.top : 0;
  const boundsBottom = bounds.bottom < this.screen.height ? bounds.bottom : 0;

  if(bounds.bottom <= this.screen.height) {
    if(this.state !== "bottom") {
      this.state = "bottom";

      if(this.screen.type !== "mobile") {
        TweenMax.set(this.images, {
          top: "auto",
          bottom: 0,
          position: "absolute",
          width: "50%"
        });

      } else {
        TweenMax.set(this.images, {
          top: "auto",
          position: "relative",
          width: "auto"
        });
      }
    }

    TweenMax.set(this.images, { y: 0 });

  } else if(bounds.top <= 1) {


    if(this.state !== "top") {
      this.state = "top";

      if(this.screen.type === "desktop") {
        TweenMax.set(this.images, {
          position: "fixed",
          width: "50%"
        });
      }
    }


  } else if(bounds.top > 1) {
    if(this.state !== "off") {
      this.state = "off";
      TweenMax.set(this.images, {
        top: 0,
        position: "relative",
        width: "auto"
      });
    }
  }
}