setAt(x, y, tx, ty) {
    const [width, height] = this.parentDimensions;
    [tx, ty] = this.screenToPageTranslation(tx, ty);

    this.x = (x + tx) / width;
    this.y = (y + ty) / height;

    this.fixAndSetPosition();
  }
Set the editor position within its parent.
@param {number} x
@param {number} y
@param {number} tx - x-translation in screen coordinates.
@param {number} ty - y-translation in screen coordinates.