function PanRecognizer() {
    classCallCheck(this, PanRecognizer);

    var _this = possibleConstructorReturn(this, (PanRecognizer.__proto__ || Object.getPrototypeOf(PanRecognizer)).apply(this, arguments));

    _this.pX = null;
    _this.pY = null;
    return _this;
  }
@private
Pan
Recognized when the pointer is down and moved in the allowed direction.
@constructor
@extends AttrRecognizer