34 lines
4.6 KiB
JavaScript
34 lines
4.6 KiB
JavaScript
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function ssc_init(){if(!document.body)return;var e=document.body;var t=document.documentElement;var n=window.innerHeight;var r=e.scrollHeight;ssc_root=document.compatMode.indexOf("CSS")>=0?t:e;ssc_activeElement=e;ssc_initdone=true;if(top!=self){ssc_frame=true}else if(r>n&&(e.offsetHeight<=n||t.offsetHeight<=n)){ssc_root.style.height="auto";if(ssc_root.offsetHeight<=n){var i=document.createElement("div");i.style.clear="both";e.appendChild(i)}}
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if(!ssc_fixedback){e.style.backgroundAttachment="scroll";t.style.backgroundAttachment="scroll"}
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if(ssc_keyboardsupport){ssc_addEvent("keydown",ssc_keydown)}}
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function ssc_scrollArray(e,t,n,r){r||(r=1e3);ssc_directionCheck(t,n);ssc_que.push({x:t,y:n,lastX:t<0?.99:-.99,lastY:n<0?.99:-.99,start:+(new Date)});if(ssc_pending){return}
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var i=function(){var s=+(new Date);var o=0;var u=0;for(var a=0;a<ssc_que.length;a++){var f=ssc_que[a];var l=s-f.start;var c=l>=ssc_animtime;var h=c?1:l/ssc_animtime;if(ssc_pulseAlgorithm){h=ssc_pulse(h)}
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var p=f.x*h-f.lastX>>0;var d=f.y*h-f.lastY>>0;o+=p;u+=d;f.lastX+=p;f.lastY+=d;if(c){ssc_que.splice(a,1);a--}}
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if(t){var v=e.scrollLeft;e.scrollLeft+=o;if(o&&e.scrollLeft===v){t=0}}
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if(n){var m=e.scrollTop;e.scrollTop+=u;if(u&&e.scrollTop===m){n=0}}
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if(!t&&!n){ssc_que=[]}
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if(ssc_que.length){setTimeout(i,r/ssc_framerate+1)}else{ssc_pending=false}};setTimeout(i,0);ssc_pending=true}
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function ssc_wheel(e){if(!ssc_initdone){ssc_init()}
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var t=e.target;var n=ssc_overflowingAncestor(t);if(!n||e.defaultPrevented||ssc_isNodeName(ssc_activeElement,"embed")||ssc_isNodeName(t,"embed")&&/\.pdf/i.test(t.src)){return true}
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var r=e.wheelDeltaX||0;var i=e.wheelDeltaY||0;if(!r&&!i){i=e.wheelDelta||0}
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if(Math.abs(r)>1.2){r*=ssc_stepsize/120}
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if(Math.abs(i)>1.2){i*=ssc_stepsize/120}
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ssc_scrollArray(n,-r,-i);e.preventDefault()}
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function ssc_keydown(e){var t=e.target;var n=e.ctrlKey||e.altKey||e.metaKey;if(/input|textarea|embed/i.test(t.nodeName)||t.isContentEditable||e.defaultPrevented||n){return true}
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if(ssc_isNodeName(t,"button")&&e.keyCode===ssc_key.spacebar){return true}
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var r,i=0,s=0;var o=ssc_overflowingAncestor(ssc_activeElement);var u=o.clientHeight;if(o==document.body){u=window.innerHeight}
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switch(e.keyCode){case ssc_key.up:s=-ssc_arrowscroll;break;case ssc_key.down:s=ssc_arrowscroll;break;case ssc_key.spacebar:r=e.shiftKey?1:-1;s=-r*u*.9;break;case ssc_key.pageup:s=-u*.9;break;case ssc_key.pagedown:s=u*.9;break;case ssc_key.home:s=-o.scrollTop;break;case ssc_key.end:var a=o.scrollHeight-o.scrollTop-u;s=a>0?a+10:0;break;case ssc_key.left:i=-ssc_arrowscroll;break;case ssc_key.right:i=ssc_arrowscroll;break;default:return true}
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ssc_scrollArray(o,i,s);e.preventDefault()}
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function ssc_mousedown(e){ssc_activeElement=e.target}
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function ssc_setCache(e,t){for(var n=e.length;n--;)ssc_cache[ssc_uniqueID(e[n])]=t;return t}
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function ssc_overflowingAncestor(e){var t=[];var n=ssc_root.scrollHeight;do{var r=ssc_cache[ssc_uniqueID(e)];if(r){return ssc_setCache(t,r)}
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t.push(e);if(n===e.scrollHeight){if(!ssc_frame||ssc_root.clientHeight+10<n){return ssc_setCache(t,document.body)}}else if(e.clientHeight+10<e.scrollHeight){overflow=getComputedStyle(e,"").getPropertyValue("overflow");if(overflow==="scroll"||overflow==="auto"){return ssc_setCache(t,e)}}}while(e=e.parentNode)}
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function ssc_addEvent(e,t,n){window.addEventListener(e,t,n||false)}
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function ssc_removeEvent(e,t,n){window.removeEventListener(e,t,n||false)}
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function ssc_isNodeName(e,t){return e.nodeName.toLowerCase()===t.toLowerCase()}
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function ssc_directionCheck(e,t){e=e>0?1:-1;t=t>0?1:-1;if(ssc_direction.x!==e||ssc_direction.y!==t){ssc_direction.x=e;ssc_direction.y=t;ssc_que=[]}}
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function ssc_pulse_(e){var t,n,r;e=e*ssc_pulseScale;if(e<1){t=e-(1-Math.exp(-e))}else{n=Math.exp(-1);e-=1;r=1-Math.exp(-e);t=n+r*(1-n)}
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return t*ssc_pulseNormalize}
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function ssc_pulse(e){if(e>=1)return 1;if(e<=0)return 0;if(ssc_pulseNormalize==1){ssc_pulseNormalize/=ssc_pulse_(1)}
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return ssc_pulse_(e)}
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var ssc_framerate=150;var ssc_animtime=500;var ssc_stepsize=150;var ssc_pulseAlgorithm=true;var ssc_pulseScale=6;var ssc_pulseNormalize=1;var ssc_keyboardsupport=true;var ssc_arrowscroll=50;var ssc_frame=false;var ssc_direction={x:0,y:0};var ssc_initdone=false;var ssc_fixedback=true;var ssc_root=document.documentElement;var ssc_activeElement;var ssc_key={left:37,up:38,right:39,down:40,spacebar:32,pageup:33,pagedown:34,end:35,home:36};var ssc_que=[];var ssc_pending=false;var ssc_cache={};setInterval(function(){ssc_cache={}},10*1e3);var ssc_uniqueID=function(){var e=0;return function(t){return t.ssc_uniqueID||(t.ssc_uniqueID=e++)}}();var ischrome=/chrome/.test(navigator.userAgent.toLowerCase());if(ischrome){ssc_addEvent("mousedown",ssc_mousedown);ssc_addEvent("mousewheel",ssc_wheel);ssc_addEvent("load",ssc_init)}
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