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//
// piecon.js
//
// https://github.com/lipka/piecon
//
// Copyright (c) 2015 Lukas Lipka <lukaslipka@gmail.com>. All rights reserved.
//
(function(){
var Piecon = {};
var currentFavicon = null;
var originalFavicon = null;
var originalTitle = null;
var canvas = null;
var options = {};
var defaults = {
color: '#ff0084',
background: '#bbb',
shadow: '#fff',
fallback: false
};
var isRetina = window.devicePixelRatio > 1;
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, l = links.length; i < l; i++) {
if (links[i].getAttribute('rel') === 'icon' || links[i].getAttribute('rel') === 'shortcut icon') {
return links[i];
}
}
return false;
};
var removeFaviconTag = function() {
var links = Array.prototype.slice.call(document.getElementsByTagName('link'), 0);
var head = document.getElementsByTagName('head')[0];
for (var i = 0, l = links.length; i < l; i++) {
if (links[i].getAttribute('rel') === 'icon' || links[i].getAttribute('rel') === 'shortcut icon') {
head.removeChild(links[i]);
}
}
};
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 getCanvas = function () {
if (!canvas) {
canvas = document.createElement("canvas");
if (isRetina) {
canvas.width = 32;
canvas.height = 32;
} else {
canvas.width = 16;
canvas.height = 16;
}
}
return canvas;
};
var drawFavicon = function(percentage) {
var canvas = getCanvas();
var context = canvas.getContext("2d");
percentage = percentage || 0;
if (context) {
context.clearRect(0, 0, canvas.width, canvas.height);
// Draw shadow
context.beginPath();
context.moveTo(canvas.width / 2, canvas.height / 2);
context.arc(canvas.width / 2, canvas.height / 2, Math.min(canvas.width / 2, canvas.height / 2), 0, Math.PI * 2, false);
context.fillStyle = options.shadow;
context.fill();
// Draw background
context.beginPath();
context.moveTo(canvas.width / 2, canvas.height / 2);
context.arc(canvas.width / 2, canvas.height / 2, Math.min(canvas.width / 2, canvas.height / 2) - 2, 0, Math.PI * 2, false);
context.fillStyle = options.background;
context.fill();
// Draw pie
if (percentage > 0) {
context.beginPath();
context.moveTo(canvas.width / 2, canvas.height / 2);
context.arc(canvas.width / 2, canvas.height / 2, Math.min(canvas.width / 2, canvas.height / 2) - 2, (-0.5) * Math.PI, (-0.5 + 2 * percentage / 100) * Math.PI, false);
context.lineTo(canvas.width / 2, canvas.height / 2);
context.fillStyle = options.color;
context.fill();
}
setFaviconTag(canvas.toDataURL());
}
};
var updateTitle = function(percentage) {
if (percentage > 0) {
document.title = '(' + percentage + '%) ' + originalTitle;
} else {
document.title = originalTitle;
}
};
Piecon.setOptions = function(custom) {
options = {};
for (var key in defaults){
options[key] = custom.hasOwnProperty(key) ? custom[key] : defaults[key];
}
return this;
};
Piecon.setProgress = function(percentage) {
if (!originalTitle) {
originalTitle = document.title;
}
if (!originalFavicon || !currentFavicon) {
var tag = getFaviconTag();
originalFavicon = currentFavicon = tag ? tag.getAttribute('href') : '/favicon.ico';
}
if (!isNaN(parseFloat(percentage)) && isFinite(percentage)) {
if (!getCanvas().getContext || browser.ie || browser.safari || options.fallback === true) {
// Fallback to updating the browser title if unsupported
return updateTitle(percentage);
} else if (options.fallback === 'force') {
updateTitle(percentage);
}
return drawFavicon(percentage);
}
return false;
};
Piecon.reset = function() {
if (originalTitle) {
document.title = originalTitle;
}
if (originalFavicon) {
currentFavicon = originalFavicon;
setFaviconTag(currentFavicon);
}
};
Piecon.setOptions(defaults);
if(typeof define === 'function' && define.amd) {
define(Piecon);
} else if (typeof module !== 'undefined') {
module.exports = Piecon;
} else {
window.Piecon = Piecon;
}
})();
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