mirror of
https://github.com/codeninjasllc/discourse.git
synced 2024-11-23 23:58:31 -05:00
102 lines
2.6 KiB
JavaScript
102 lines
2.6 KiB
JavaScript
/*
|
|
* favcount.js v1.5.0
|
|
* http://chrishunt.co/favcount
|
|
* Dynamically updates the favicon with a number.
|
|
*
|
|
* Copyright 2013, Chris Hunt
|
|
* Released under the MIT license
|
|
*/
|
|
|
|
(function(){
|
|
function Favcount(icon) {
|
|
this.icon = icon;
|
|
this.opacity = 0.4;
|
|
this.canvas = document.createElement('canvas');
|
|
this.font = "Helvetica, Arial, sans-serif";
|
|
}
|
|
|
|
Favcount.prototype.set = function(count) {
|
|
var self = this,
|
|
img = document.createElement('img');
|
|
|
|
if (Ember.testing) { return; }
|
|
|
|
if (self.canvas.getContext) {
|
|
img.crossOrigin = "anonymous";
|
|
|
|
img.onload = function() {
|
|
drawCanvas(self.canvas, self.opacity, self.font, img, normalize(count));
|
|
};
|
|
|
|
img.src = this.icon;
|
|
}
|
|
};
|
|
|
|
function normalize(count) {
|
|
count = Math.round(count);
|
|
|
|
if (isNaN(count) || count < 1) {
|
|
return '';
|
|
} else if (count < 10) {
|
|
return ' ' + count;
|
|
} else if (count > 99) {
|
|
return '99';
|
|
} else {
|
|
return count;
|
|
}
|
|
}
|
|
|
|
function drawCanvas(canvas, opacity, font, img, count) {
|
|
var head = document.getElementsByTagName('head')[0],
|
|
favicon = document.createElement('link'),
|
|
multiplier, fontSize, context, xOffset, yOffset, border, shadow;
|
|
|
|
favicon.rel = 'icon';
|
|
|
|
// Scale canvas elements based on favicon size
|
|
multiplier = img.width / 16;
|
|
fontSize = multiplier * 11;
|
|
xOffset = multiplier;
|
|
yOffset = multiplier * 11;
|
|
border = multiplier;
|
|
shadow = multiplier * 2;
|
|
|
|
canvas.height = canvas.width = img.width;
|
|
context = canvas.getContext('2d');
|
|
context.font = 'bold ' + fontSize + 'px ' + font;
|
|
|
|
// Draw faded favicon background
|
|
if (count) { context.globalAlpha = opacity; }
|
|
context.drawImage(img, 0, 0);
|
|
context.globalAlpha = 1.0;
|
|
|
|
// Draw white drop shadow
|
|
context.shadowColor = '#FFF';
|
|
context.shadowBlur = shadow;
|
|
context.shadowOffsetX = 0;
|
|
context.shadowOffsetY = 0;
|
|
|
|
// Draw white border
|
|
context.fillStyle = '#FFF';
|
|
context.fillText(count, xOffset, yOffset);
|
|
context.fillText(count, xOffset + border, yOffset);
|
|
context.fillText(count, xOffset, yOffset + border);
|
|
context.fillText(count, xOffset + border, yOffset + border);
|
|
|
|
// Draw black count
|
|
context.fillStyle = '#000';
|
|
context.fillText(count,
|
|
xOffset + (border / 2.0),
|
|
yOffset + (border / 2.0)
|
|
);
|
|
|
|
// Replace favicon with new favicon
|
|
favicon.href = canvas.toDataURL('image/png');
|
|
head.removeChild(document.querySelector('link[rel=icon]'));
|
|
head.appendChild(favicon);
|
|
}
|
|
|
|
Favcount.VERSION = '1.5.0';
|
|
this.Favcount = Favcount;
|
|
}).call(this);
|
|
|