onMoveEnd = function onMoveEnd() {
          listen(target$$1, 'transitionend', onMoveEnd, false);
          cb(target$$1);
        }
Move the Element currently grabbed given a position and apply extra zoom-in.
@param  {number}   x The X-axis of where the press happened.
@param  {number}   y The Y-axis of where the press happened.
@param  {number}   scaleExtra Extra zoom-in to apply.
@param  {Function} [cb=this.options.onMove] A callback function that
will be called when a target is moved and transition has ended. It will
get the target element as the argument.
@return {this}