lethargy.min.js

(function(){var t;t="undefined"!=typeof exports&&null!==exports?exports:this,t.Lethargy=function(){function t(t,s,i,l){this.stability=null!=t?Math.abs(t):8,this.sensitivity=null!=s?1+Math.abs(s):100,this.tolerance=null!=i?1+Math.abs(i):1.1,this.delay=null!=l?l:150,this.lastUpDeltas=function(){var t,s,i;for(i=[],t=1,s=2*this.stability;s>=1?s>=t:t>=s;s>=1?t++:t--)i.push(null);return i}.call(this),this.lastDownDeltas=function(){var t,s,i;for(i=[],t=1,s=2*this.stability;s>=1?s>=t:t>=s;s>=1?t++:t--)i.push(null);return i}.call(this),this.deltasTimestamp=function(){var t,s,i;for(i=[],t=1,s=2*this.stability;s>=1?s>=t:t>=s;s>=1?t++:t--)i.push(null);return i}.call(this)}return t.prototype.check=function(t){var s;return t=t.originalEvent||t,null!=t.wheelDelta?s=t.wheelDelta:null!=t.deltaY?s=-40*t.deltaY:(null!=t.detail||0===t.detail)&&(s=-40*t.detail),this.deltasTimestamp.push(Date.now()),this.deltasTimestamp.shift(),s>0?(this.lastUpDeltas.push(s),this.lastUpDeltas.shift(),this.isInertia(1)):(this.lastDownDeltas.push(s),this.lastDownDeltas.shift(),this.isInertia(-1))},t.prototype.isInertia=function(t){var s,i,l,a,e,n,h;return s=-1===t?this.lastDownDeltas:this.lastUpDeltas,null===s[0]?t:this.deltasTimestamp[2*this.stability-2]+this.delay>Date.now()&&s[0]===s[2*this.stability-1]?!1:(l=s.slice(0,this.stability),i=s.slice(this.stability,2*this.stability),h=l.reduce(function(t,s){return t+s}),e=i.reduce(function(t,s){return t+s}),n=h/l.length,a=e/i.length,Math.abs(n)<Math.abs(a*this.tolerance)&&this.sensitivity<Math.abs(a)?t:!1)},t.prototype.showLastUpDeltas=function(){return this.lastUpDeltas},t.prototype.showLastDownDeltas=function(){return this.lastDownDeltas},t}()}).call(this);