added piecon lib, bug before

js/libs/piecon.js

@@ -0,0 +1,186 @@
+//
+// piecon.js
+//
+// https://github.com/lipka/piecon
+//
+// Copyright (c) 2012 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 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 = document.getElementsByTagName('link');
+        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");
+            canvas.width = 16;
+            canvas.height = 16;
+        }
+
+        return canvas;
+    };
+
+    var drawFavicon = function(percentage) {
+        var canvas = getCanvas();
+        var context = canvas.getContext("2d");
+        var percentage = percentage || 0;
+        var src = currentFavicon;
+
+        var faviconImage = new Image();
+        faviconImage.onload = function() {
+            if (context) {
+                context.clearRect(0, 0, 16, 16);
+
+                // 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());
+            }
+        };
+
+        // allow cross origin resource requests if the image is not a data:uri
+        // as detailed here: https://github.com/mrdoob/three.js/issues/1305
+        if (!src.match(/^data/)) {
+            faviconImage.crossOrigin = 'anonymous';
+        }
+
+        faviconImage.src = src;
+    };
+
+    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);
+    window.Piecon = Piecon;
+})();