smartscroll.min.js

!function(e){var t,n="mousewheel DOMMouseScroll wheel MozMousePixelScroll";"undefined"!=typeof Lethargy&&null!==Lethargy&&(t=new Lethargy);var i=function(){return Math.max(window.pageYOffset,window.document.body.scrollTop,window.document.documentElement.scrollTop)};e.smartscroll=function(o){var r=e.extend({},e.smartscroll.defaults,o);if(r.sectionSelector||(r.sectionSelector="."+r.sectionClass),("undefined"==typeof EventEmitter||null===EventEmitter||r.eventEmitter&&r.eventEmitter.constructor!==EventEmitter)&&(r.eventEmitter=null),r.bindSwipe)var a=null,l=null,s=function(e){var t=e.originalEvent||e;a=t.touches[0].clientX,l=t.touches[0].clientY},c=function(e){var t=e.originalEvent||e;if(a&&l){var n=t.touches[0].clientX,i=t.touches[0].clientY,o=a-n,s=l-i;Math.abs(o)>Math.abs(s)?o>0?r.eventEmitter.emitEvent("swipeLeft"):r.eventEmitter.emitEvent("swipeRight"):s>0?r.eventEmitter.emitEvent("swipeUp"):r.eventEmitter.emitEvent("swipeDown"),a=null,l=null}};var d,h,u=!1,w=[],v=!1,p=!1,f=window.location.hash,m=e(r.sectionWrapperSelector+":first"),E=function(){var t=[];d=Math.round(m.position().top+parseInt(m.css("paddingTop"),10)+parseInt(m.css("borderTopWidth"),10)+parseInt(m.css("marginTop"),10)),h=Math.round(d+m.height(),10),t.push(d),e(r.sectionSelector).each(function(n,i){t.push(Math.round(d+e(i).position().top+e(i).outerHeight()))}),w=t},g=function(e){for(var t=0;t<w.length;t+=1)if(e<=w[t])return t;return w.length},S=function(){var t;if(i()+e(window).height()/2<d)t=r.headerHash;else{var n=g(i()+e(window).height()/2);n!==undefined&&(t=e(r.sectionSelector+":nth-of-type("+n+")").data("hash"))}void 0!==t&&window.location.hash==="#"+t||(void 0===t&&(t=r.headerHash),r.keepHistory?window.location.hash=t:window.location.replace(window.location.href.split("#")[0]+"#"+t))},b=function(t,n){u||(u=!0,e("body,html").stop(!0,!0).animate({scrollTop:t},n,function(){if(u=!1,r.eventEmitter){var t=i(),n=g(t+e(window).height()/2);r.eventEmitter.emitEvent("scrollEnd",[n])}}))};this.scroll=function(t){if(w){var n,o=i();if(r.eventEmitter){n=g(o+e(window).height()/2);var a=t?n+1:n-1;r.eventEmitter.emitEvent("scrollStart",[a])}for(var l=0;l<w.length;l+=1)if(o<w[l])return b(t?w[l]:w[l-1]-e(window).height(),r.animationSpeed),r.eventEmitter&&r.eventEmitter.emitEvent("scrollEnd",[n]),!1}return undefined};var y=function(){e(window).bind(n,function(n){var o=function(e){var n;if(t&&(n=t.check(e)),!u)if(t){if(1===n)return"up";if(-1===n)return"down"}else{if(e.originalEvent.wheelDelta>0||e.originalEvent.detail<0)return"up";if(e.originalEvent.wheelDelta<0||e.originalEvent.detail>0)return"down"}return!1}(n);r.dynamicHeight&&E();var a=i(),l=a+e(window).height();if(l>d&&a<=h){var s=g(a),c=g(a+e(window).height()/2);s===g(l)&&r.innerSectionScroll||(n.preventDefault(),n.stopPropagation(),o&&("up"===o?(r.toptotop?b(w[c-2]+1,r.animationSpeed):b(w[c-1]-e(window).height(),r.animationSpeed),r.eventEmitter&&r.eventEmitter.emitEvent("scrollStart",[c-1])):"down"===o&&(b(w[c]+1,r.animationSpeed),r.eventEmitter&&r.eventEmitter.emitEvent("scrollStart",[c+1]))))}})};if(m.css({position:"relative"}),setTimeout(function(){if(E(),r.autoHash&&(null===r.eventEmitter||r.hashContinuousUpdate?e(window).bind("scroll",S):r.eventEmitter.addListener("scrollEnd",S)),r.initialScroll&&f.length>0){var t=e('[data-hash="'+f.substr(1)+'"]');t.length>0&&b(t[0].offsetTop+d,0)}},50),e(window).bind("resize",E),null!==r.breakpoint&&r.breakpoint===parseInt(r.breakpoint,10)&&r.breakpoint>0&&(v=!0),"vp"===r.mode)if(r.ie8){var k=function(){e(r.sectionSelector).css({height:e(window).height()})};k(),e(window).bind("resize",k)}else e(r.sectionSelector).css({height:"100vh"});if(r.sectionScroll&&(v&&e(window).bind("resize",function(){if(e(window).width()<r.breakpoint){if(!p)return e(window).unbind(n),p=!0,!1}else p&&(y(),p=!1);return undefined}),y()),r.bindSwipe&&(e(window).on("touchstart",s),e(window).on("touchmove",c)),r.bindKeyboard){e(window).on("keydown",function(t){var n=t.originalEvent||t;r.dynamicHeight&&E();var o=i(),a=o+e(window).height();if(function(){var t=i();return t+e(window).height()>d&&t<=h}()){var l=g(o),s=g(o+e(window).height()/2);if(l!==g(a)||!r.innerSectionScroll)switch(n.which){case 38:n.preventDefault(),n.stopPropagation(),r.toptotop?b(w[s-2]+1,r.animationSpeed):b(w[s-1]-e(window).height(),r.animationSpeed),r.eventEmitter&&r.eventEmitter.emitEvent("scrollStart",[s-1]);break;case 40:n.preventDefault(),n.stopPropagation(),b(w[s]+1,r.animationSpeed),r.eventEmitter&&r.eventEmitter.emitEvent("scrollStart",[s+1])}}})}return this},e.smartscroll.defaults={animationSpeed:700,autoHash:!0,breakpoint:null,initialScroll:!0,headerHash:"header",keepHistory:!1,mode:"vp",sectionClass:"section",sectionSelector:null,sectionScroll:!0,sectionWrapperSelector:".section-wrapper",eventEmitter:null,dynamicHeight:!1,ie8:!1,hashContinuousUpdate:!0,innerSectionScroll:!0,toptotop:!1,bindSwipe:!0,bindKeyboard:!0}}(jQuery);