8 lines
4.8 KiB
JavaScript
8 lines
4.8 KiB
JavaScript
/*!
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Tinycon - A small library for manipulating the Favicon
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Tom Moor, http://tommoor.com
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Copyright (c) 2012 Tom Moor
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@license MIT Licensed
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@version 0.6.3
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*/
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(function(){var Tinycon={};var currentFavicon=null;var originalFavicon=null;var faviconImage=null;var canvas=null;var options={};var r=window.devicePixelRatio||1;var size=16*r;var defaults={width:7,height:9,font:10*r+'px arial',colour:'#ffffff',background:'#F03D25',fallback:true,crossOrigin:true,abbreviate:true};var ua=(function(){var agent=navigator.userAgent.toLowerCase();return function(browser){return agent.indexOf(browser)!==-1}}());var browser={ie:ua('msie'),chrome:ua('chrome'),webkit:ua('chrome')||ua('safari'),safari:ua('safari')&&!ua('chrome'),mozilla:ua('mozilla')&&!ua('chrome')&&!ua('safari')};var getFaviconTag=function(){var links=document.getElementsByTagName('link');for(var i=0,len=links.length;i<len;i++){if((links[i].getAttribute('rel')||'').match(/\bicon\b/)){return links[i]}}return false};var removeFaviconTag=function(){var links=document.getElementsByTagName('link');var head=document.getElementsByTagName('head')[0];for(var i=0,len=links.length;i<len;i++){var exists=(typeof(links[i])!=='undefined');if(exists&&(links[i].getAttribute('rel')||'').match(/\bicon\b/)){head.removeChild(links[i])}}};var getCurrentFavicon=function(){if(!originalFavicon||!currentFavicon){var tag=getFaviconTag();originalFavicon=currentFavicon=tag?tag.getAttribute('href'):'/favicon.ico'}return currentFavicon};var getCanvas=function(){if(!canvas){canvas=document.createElement("canvas");canvas.width=size;canvas.height=size}return canvas};var setFaviconTag=function(url){removeFaviconTag();var link=document.createElement('link');link.type='image/x-icon';link.rel='icon';link.href=url;document.getElementsByTagName('head')[0].appendChild(link)};var log=function(message){if(window.console)window.console.log(message)};var drawFavicon=function(label,colour){if(!getCanvas().getContext||browser.ie||browser.safari||options.fallback==='force'){return updateTitle(label)}var context=getCanvas().getContext("2d");var colour=colour||'#000000';var src=getCurrentFavicon();faviconImage=document.createElement('img');faviconImage.onload=function(){context.clearRect(0,0,size,size);context.drawImage(faviconImage,0,0,faviconImage.width,faviconImage.height,0,0,size,size);if((label+'').length>0)drawBubble(context,label,colour);refreshFavicon()};if(!src.match(/^data/)&&options.crossOrigin){faviconImage.crossOrigin='anonymous'}faviconImage.src=src};var updateTitle=function(label){if(options.fallback){var originalTitle=document.title;if(originalTitle[0]==='('){originalTitle=originalTitle.slice(originalTitle.indexOf(' '))}if((label+'').length>0){document.title='('+label+') '+originalTitle}else{document.title=originalTitle}}};var drawBubble=function(context,label,colour){if(typeof label=='number'&&label>99&&options.abbreviate){label=abbreviateNumber(label)}var len=(label+'').length-1;var width=options.width*r+(6*r*len),height=options.height*r;var top=size-height,left=size-width-r,bottom=16*r,right=16*r,radius=2*r;context.font=(browser.webkit?'bold ':'')+options.font;context.fillStyle=options.background;context.strokeStyle=options.background;context.lineWidth=r;context.beginPath();context.moveTo(left+radius,top);context.quadraticCurveTo(left,top,left,top+radius);context.lineTo(left,bottom-radius);context.quadraticCurveTo(left,bottom,left+radius,bottom);context.lineTo(right-radius,bottom);context.quadraticCurveTo(right,bottom,right,bottom-radius);context.lineTo(right,top+radius);context.quadraticCurveTo(right,top,right-radius,top);context.closePath();context.fill();context.beginPath();context.strokeStyle="rgba(0,0,0,0.3)";context.moveTo(left+radius/2.0,bottom);context.lineTo(right-radius/2.0,bottom);context.stroke();context.fillStyle=options.colour;context.textAlign="right";context.textBaseline="top";context.fillText(label,r===2?29:15,browser.mozilla?7*r:6*r)};var refreshFavicon=function(){if(!getCanvas().getContext)return;setFaviconTag(getCanvas().toDataURL())};var abbreviateNumber=function(label){var metricPrefixes=[['G',1000000000],['M',1000000],['k',1000]];for(var i=0;i<metricPrefixes.length;++i){if(label>=metricPrefixes[i][1]){label=round(label/metricPrefixes[i][1])+metricPrefixes[i][0];break}}return label};var round=function(value,precision){var number=new Number(value);return number.toFixed(precision)};Tinycon.setOptions=function(custom){options={};for(var key in defaults){options[key]=custom.hasOwnProperty(key)?custom[key]:defaults[key]}return this};Tinycon.setImage=function(url){currentFavicon=url;refreshFavicon();return this};Tinycon.setBubble=function(label,colour){label=label||'';drawFavicon(label,colour);return this};Tinycon.reset=function(){setFaviconTag(originalFavicon)};Tinycon.setOptions(defaults);window.Tinycon=Tinycon;if(typeof define==='function'&&define.amd){define(Tinycon)}})();
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