/**
* Construct a new GestureDetector.
* @param type the type of gesture
* @param pointer to the scene object, nullptr if none
* by default GestureDetectors don't have our own scene object
*/
/**
* Construct a new GestureDetector.
* @param type the type of gesture
* @param pointer to the scene object, nullptr if none
* by default GestureDetectors don't have our own scene object
*/