scrollability-min.js

/* See LICENSE for terms of usage */(function(){function E(b){var c=b.parentNode;return{node:b,scrollbar:B(b),min:-c.scrollHeight+c.offsetHeight,max:0,viewport:c.offsetHeight,bounce:c.offsetHeight*e,constrained:!0,filter:function(a,b){return b},disable:function(b,c,d,e){var f=Math.abs(b-d),g=Math.abs(c-e);if(f>g&&f>a)return!0},update:function(a,b){A(a,a.scrollable_horizontal,b)}}}function D(b){var c=b.parentNode;return{node:b,min:-c.scrollWidth+c.offsetWidth,max:0,viewport:c.offsetWidth,bounce:c.offsetWidth*e,constrained:!0,filter:function(a,b){return a},disable:function(b,c,d,e){var f=Math.abs(b-d),g=Math.abs(c-e);if(g>f&&g>a)return!0},update:function(a,b){A(a,b,a.scrollable_vertical)}}}function C(a,b,c,d){return a==d?b+c:c*(-Math.pow(2,-10*a/d)+1)+b}function B(a){if(!a.scrollableScrollbar){var b=a.scrollableScrollbar=document.createElement("div");b.className="scrollableScrollbar",b.style.cssText=["position: absolute","top: 0","right: 2px","width: 5px","min-height: 6px","background: #666","opacity: 0","-webkit-border-radius: 2px 3px","-webkit-transform: translate3d(0,0,0)","-webkit-transition: opacity 0.15s linear"].join(";")}return a.scrollableScrollbar}function A(a,b,c){a.style.webkitTransform="translate3d("+(b?b+"px":"0")+","+(c?c+"px":"0")+","+"0)"}function z(){if(q){clearInterval(q),q=0;for(var a=0;a<r.length;++a){var b=r[a];b.terminator()}r=[]}}function y(a){for(var b=0;b<a.length;++b){var c=a[b];c.className=c.className.replace("touched","")}}function x(a){var b=[];for(var c=a;c;c=c.parentNode)c.nodeType==1&&(c.className=(c.className?c.className+" ":"")+"touched",b.push(c));return b}function w(a){var b=[];while(a){if(a.nodeType==1){var c=a.className.split(" ");if(c.indexOf("scrollable")!=-1){var d=c.indexOf("paginated")!=-1;for(var e=0;e<c.length;++e){var f=c[e];if(s[f]){var g=s[f](a);g.key="scrollable_"+f,g.paginated=d,g.key in a||(a[g.key]=g.initial?g.initial(a):0),b.push(g)}}if(c.indexOf("exclusive")!=-1)break}}a=a.parentNode}return b}function v(){var a=(new Date).getTime();for(var b=0;b<r.length;++b){var c=r[b],d=c.filter(m,n);c.animator(d,a)||(c.terminator(),r.splice(b--,1))}r.length||z()}function u(a,e,k,l){function N(){n?M(Math.round(s/q)*q):s>u&&m?M(u):s<t&&m&&M(t),r&&(r.style.opacity="0",r.style.webkitTransition="opacity 0.2s linear")}function M(b,c){s=b,a.node[a.key]=s,a.update(a.node,s);var d=-t-u;if(r&&q<d){var e=q-j*2,f=e/d*e,g=0;s>u?(f=Math.max(f-(s-u),5),g=0):s<t?(f=Math.max(f-(t-s),5),g=e-f):g=Math.round(Math.abs(s)/d*(e-f)),g+=j,r.style.height=Math.round(f)+"px",A(r,0,Math.round(g)),p&&(r.style.opacity="0.8",r.style.webkitTransition="none")}return c}function L(a,e){var h=1/(e-G);G=e;var j=!0;if(o){var k=(a-F)*b;if(!k){H||(H=e);if(e-H<I)return!0}else H=0;F=a,x=k/h;if(s>u&&m){var l=s-u;x*=1-l/D}else if(s<t&&m){var l=t-s;x*=1-l/D}}else{if(n&&!J){J=!0;if(Math.abs(s-u)>E||Math.abs(x)>i)s>u?u!=w&&(u+=q,t+=q):t!=v&&(u-=q,t-=q)}if(s>u&&m){if(!(x>0)){y||(z=s,B=u-s),s=C(y,z,B,g);return M(s,++y<=g&&Math.floor(s)>u)}var l=s-u,p=1-l/D;x=Math.max(x-f*h,0)*p,y=0}else if(s<t&&m){if(!(x<0)){y||(z=s,B=t-s),s=C(y,z,B,g);return M(s,++y<=g&&Math.ceil(s)<t)}var l=t-s,p=1-l/D;x=Math.min(x+f*h,0)*p,y=0}else{y||(x<0&&x<-c?x=-c:x>0&&x>c&&(x=c),z=x),x=C(y,z,-z,d);if(++y>d||Math.floor(x)==0)j=!1}}s+=x*h;return M(s,j)}var m=a.constrained,n=a.paginated,q=a.viewport||0,r=a.scrollbar,s=a.node[a.key],t=a.min,u=a.max,v=t,w=Math.round(u/q)*q,x=0,y=0,z,B,D=a.bounce,E=q*h,F=a.filter(e,k),G=l,H=0,I=20,J=!1;if(n){var K=Math.round(s/q)*q;t=u=Math.round(K+w)}r&&a.node.parentNode.appendChild(r);return{filter:a.filter,disable:a.disable,animator:L,terminator:N}}function t(a){function t(a){d&&(clearTimeout(d),d=0);if(b){var c=document.createEvent("MouseEvents");c.initMouseEvent("click",!0,!0,window,1),b[0].dispatchEvent(c),y(b)}j.removeEventListener("touchmove",s,!1),j.removeEventListener("touchend",t,!1),o=!1}function s(a){a.preventDefault(),p=!0,d&&(clearTimeout(d),d=0),b&&(y(b),b=null);var c=a.touches[0];m=c.clientX,n=c.clientY;if(r.length>1)for(var e=0;e<r.length;++e){var f=r[e];if(f.disable&&f.disable(m,n,k,l)){f.terminator(),r.splice(e,1);break}}}a.preventDefault();var b=null,c=a.target,d=setTimeout(function(){d=0,b=x(c)},50);z();var e=a.touches[0];m=k=e.clientX,n=l=e.clientY,o=!0,p=!1,r=[];var f=(new Date).getTime(),g=w(a.target);if(g.length){for(var h=0;h<g.length;++h){var i=u(g[h],m,n,f);i&&r.push(i)}q=setInterval(v,0)}var j=document;j.addEventListener("touchmove",s,!1),j.addEventListener("touchend",t,!1)}var a=10,b=1,c=720/devicePixelRatio,d=350,e=.5,f=300,g=90,h=.05,i=50,j=2,k,l,m,n,o,p,q=0,r=[],s={horizontal:D,vertical:E};document.addEventListener("touchstart",t,!1)})()