nl_tokens: enable one - finger touch to drag
pl_tokens: function Drag ( parent , options ) { _classCallCheck ( this , Drag ) ; options = options || { } ; var _this = _possibleConstructorReturn ( this , ( Drag . __proto__ || Object . getPrototypeOf ( Drag ) ) . call ( this , parent ) ) ; _this . moved = false ; _this . wheelActive = utils . defaults ( options . wheel , <mask> ) ; _this . wheelScroll = options . wheelScroll || 1 ; _this . reverse = options . reverse ? 1 : - 1 ; _this . clampWheel = options . clampWheel ; _this . factor = options . factor || 1 ; _this . xDirection = ! options . direction || options . direction === 'all' || options . direction === 'x' ; _this . yDirection = ! options . direction || options . direction === 'all' || options . direction === 'y' ; _this . parseUnderflow ( options . underflow || 'center' ) ; _this . mouseButtons ( options . mouseButtons ) ; return _this ; }