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detect-zoom.js
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detect-zoom.js
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/* Detect-zoom
* -----------
* Cross Browser Zoom and Pixel Ratio Detector
* Version 1.0.4 | Apr 1 2013
* dual-licensed under the WTFPL and MIT license
* Maintained by https://github/tombigel
* Original developer https://github.com/yonran
*/
//AMD and CommonJS initialization copied from https://github.com/zohararad/audio5js
(function (root, ns, factory) {
"use strict";
if (typeof (module) !== 'undefined' && module.exports) { // CommonJS
module.exports = factory(ns, root);
} else if (typeof (define) === 'function' && define.amd) { // AMD
define("detect-zoom", function () {
return factory(ns, root);
});
} else {
root[ns] = factory(ns, root);
}
}(window, 'detectZoom', function () {
/**
* Use devicePixelRatio if supported by the browser
* @return {Number}
* @private
*/
const devicePixelRatio = () => {
return window.devicePixelRatio || 1;
};
const isRetinaDevice = () => {
return devicePixelRatio() > 1
}
/**
* Fallback function to set default values
* @return {Object}
* @private
*/
const fallback = () => ({
zoom: 1,
devicePxPerCssPx: 1
})
const commonZoomMethod = (screenResolution, windowWidth) => {
const zoom = Math.round(((screenResolution) / windowWidth)*100) / 100;
return {
zoom: zoom * 100,
devicePxPerCssPx: zoom * devicePixelRatio(),
screenResolution
};
}
/**
* For chrome
* @return {Object}
*/
const chrome = () => commonZoomMethod(window.outerWidth, window.innerWidth);
/**
* For safari (same as chrome)
* @return {Object}
*/
const safari = () => commonZoomMethod(window.outerWidth, window.innerWidth);
/**
* Firefox 18.x
* Mozilla added support for devicePixelRatio to Firefox 18,
* but it is affected by the zoom level, and by retina display
* so we need to check retina displays and treat it as normal display
* @return {Object}
* @private
*/
const firefox18 = function () {
const pixelRatio = isRetinaDevice ? devicePixelRatio() / 2 : devicePixelRatio()
const screenWidthResolution = screen.width * pixelRatio;
return commonZoomMethod(screenWidthResolution, window.innerWidth);
};
/**
* Generate detection function
* @private
*/
const detectFunction = (function () {
let func = fallback;
const isSafari =
/Safari/.test(navigator.userAgent) &&
/Apple Computer/.test(navigator.vendor);
//chrome
if(!!window.chrome && !(!!window.opera || navigator.userAgent.indexOf(' Opera') >= 0)){
func = chrome;
}
//safari
else if(Object.prototype.toString.call(window.HTMLElement).indexOf('Constructor') > 0 || isSafari){
func = safari;
}
//WebKit
else if ('webkitRequestAnimationFrame' in window) {
func = webkit;
}
//Last one is Firefox
//FF 18.x
else if (window.devicePixelRatio) {
func = firefox18;
}
return func;
}());
return ({
/**
* Ratios.zoom shorthand
* @return {Number} Zoom level
*/
zoom: function () {
return detectFunction().zoom;
},
/**
* Ratios.screenResolution shorthand
* @return {Number} screenResolution value
*/
screenResolution: function () {
return detectFunction().screenResolution;
}
});
}));
//-----------------------
// debouncing plugin by Paul Irish https://www.paulirish.com/2009/throttled-smartresize-jquery-event-handler/
//-----------------------
(function($,sr){
const debounce = function (func, threshold, execAsap) {
let timeout;
return function debounced () {
const obj = this, args = arguments;
function delayed () {
if (!execAsap)
func.apply(obj, args);
timeout = null;
};
if (timeout)
clearTimeout(timeout);
else if (execAsap)
func.apply(obj, args);
timeout = setTimeout(delayed, threshold || 100);
};
}
// smartresize
jQuery.fn[sr] = function(fn){ return fn ? this.on('resize', debounce(fn)) : this.trigger(sr); };
})(jQuery,'smartresize');
//-----------------------
// Custom functions
//-----------------------
const aZoom = $('.a-zoom');
const dZoom = $('.d-zoom');
function getZoomValues () {
const zoom = detectZoom.zoom();
const newZoomVal = parseFloat(zoom,10).toFixed(0);
aZoom.text(newZoomVal);
}
$(document).ready(function() {
getZoomValues();
});
$(window).smartresize(function(){
getZoomValues();
});