mirror of
https://github.com/discourse/discourse.git
synced 2024-11-30 11:25:07 +08:00
4e9cf2f26e
We've already made the CORS changes in our copy of favcount, but we should bump the version to match upstream.
103 lines
2.6 KiB
JavaScript
103 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 (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);
|
|
}
|
|
|
|
this.Favcount = Favcount;
|
|
}).call(this);
|
|
|
|
(function(){
|
|
Favcount.VERSION = '1.5.0';
|
|
}).call(this);
|