Created
February 7, 2012 22:53
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Make drawFavicon public to bypass number type checking. Original repo: https://github.com/tommoor/tinycon
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/* | |
* Tinycon - A small library for manipulating the Favicon | |
* Tom Moor, http://tommoor.com | |
* Copyright (c) 2012 Tom Moor | |
* MIT Licensed | |
* @version 0.2 | |
*/ | |
(function(){ | |
var Tinycon = {}; | |
var currentFavicon = null; | |
var originalFavicon = null; | |
var originalTitle = document.title; | |
var faviconImage = null; | |
var canvas = null; | |
var options = {}; | |
var defaults = { | |
width: 7, | |
height: 9, | |
font: '10px arial', | |
colour: '#ffffff', | |
background: '#F03D25', | |
fallback: true | |
}; | |
var ua = function(browser){ | |
var agent = navigator.userAgent.toLowerCase(); | |
return agent.indexOf(browser) !== -1; | |
}; | |
var browser = { | |
chrome: ua('chrome'), | |
webkit: ua('chrome') || ua('safari'), | |
safari: ua('safari') && !ua('chrome'), | |
mozilla: ua('mozilla') && !ua('chrome') && !ua('safari') | |
}; | |
// private | |
var getFaviconTag = function(){ | |
var links = document.getElementsByTagName('link'); | |
for(var i=0; i < links.length; i++) { | |
if (links[i].getAttribute('rel') === 'icon') { | |
return links[i]; | |
} | |
} | |
return false; | |
}; | |
var removeFaviconTag = function(){ | |
var links = document.getElementsByTagName('link'); | |
var head = document.getElementsByTagName('head')[0]; | |
for(var i=0; i < links.length; i++) { | |
if (links[i].getAttribute('rel') === 'icon') { | |
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 = 16; | |
canvas.height = 16; | |
} | |
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 = Tinycon.drawFavicon = function(num, colour) { | |
// fallback to updating the browser title if unsupported | |
if (!getCanvas().getContext || browser.safari) { | |
return updateTitle(num); | |
} | |
var context = getCanvas().getContext("2d"); | |
var colour = colour || '#000000'; | |
var num = num || 0; | |
faviconImage = new Image(); | |
faviconImage.onload = function() { | |
// clear canvas | |
context.clearRect(0, 0, 16, 16); | |
// draw original favicon | |
context.drawImage(faviconImage, 0, 0, faviconImage.width, faviconImage.height, 0, 0, 16, 16); | |
// draw bubble over the top | |
if (isNaN(num) || num > 0) drawBubble(context, num, colour); | |
// refresh tag in page | |
refreshFavicon(); | |
}; | |
faviconImage.src = getCurrentFavicon(); | |
}; | |
var updateTitle = function(num) { | |
if (options.fallback) { | |
if (num > 0) { | |
document.title = '('+num+') ' + originalTitle; | |
} else { | |
document.title = originalTitle; | |
} | |
} | |
}; | |
var drawBubble = function(context, num, colour) { | |
// bubble needs to be larger for double digits | |
var len = (num+"").length-1; | |
var width = options.width + (6*len); | |
var w = 16-width; | |
var h = 16-options.height; | |
// webkit seems to render fonts lighter than firefox | |
context.font = (browser.webkit ? 'bold ' : '') + options.font; | |
context.fillStyle = options.background; | |
context.strokeStyle = options.background; | |
context.lineWidth = 1; | |
// bubble | |
context.fillRect(w,h,width-1,options.height); | |
// rounded left | |
context.beginPath(); | |
context.moveTo(w-0.5,h+1); | |
context.lineTo(w-0.5,15); | |
context.stroke(); | |
// rounded right | |
context.beginPath(); | |
context.moveTo(15.5,h+1); | |
context.lineTo(15.5,15); | |
context.stroke(); | |
// bottom shadow | |
context.beginPath(); | |
context.strokeStyle = "rgba(0,0,0,0.3)"; | |
context.moveTo(w,16); | |
context.lineTo(15,16); | |
context.stroke(); | |
// number | |
context.fillStyle = options.colour; | |
context.textAlign = "right"; | |
context.textBaseline = "top"; | |
// unfortunately webkit/mozilla are a pixel different in text positioning | |
context.fillText(num, 15, browser.mozilla ? 7 : 6); | |
}; | |
var refreshFavicon = function(){ | |
// check support | |
if (!getCanvas().getContext) return; | |
setFaviconTag(getCanvas().toDataURL()); | |
}; | |
// public | |
Tinycon.setOptions = function(custom){ | |
options = {}; | |
for(var i in defaults){ | |
options[i] = custom[i] ? custom[i] : defaults[i]; | |
} | |
return this; | |
}; | |
Tinycon.setImage = function(url){ | |
currentFavicon = url; | |
refreshFavicon(); | |
return this; | |
}; | |
Tinycon.setBubble = function(num, colour){ | |
// validate | |
if(isNaN(num)) return log('Bubble must be a number'); | |
drawFavicon(num, colour); | |
return this; | |
}; | |
Tinycon.reset = function(){ | |
Tinycon.setImage(originalFavicon); | |
}; | |
Tinycon.setOptions(defaults); | |
window.Tinycon = Tinycon; | |
})(); |
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Original repo: https://github.com/tommoor/tinycon