1044 lines
28 KiB
JavaScript
1044 lines
28 KiB
JavaScript
/*
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copyright (c) 2008 Wouter van der Graaf, all rights reserved
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css3-mediaqueries.js - CSS Helper and CSS3 Media Queries Enabler
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author: Wouter van der Graaf <woutervandergraaf at gmail com>
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version: 0.9 (20091001)
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license: MIT
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website: http://woutervandergraaf.nl/css3-mediaqueries-js/
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W3C spec: http://www.w3.org/TR/css3-mediaqueries/
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Note: use of embedded <style> is not recommended when using media queries, because IE has no way of returning the raw literal css text from a <style> element.
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*/
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// true prototypal inheritance (http://javascript.crockford.com/prototypal.html)
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if (typeof Object.create !== 'function') {
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Object.create = function (o) {
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function F() {}
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F.prototype = o;
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return new F();
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};
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}
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// user agent sniffing shortcuts
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var ua = {
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toString: function () {
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return navigator.userAgent;
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},
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test: function (s) {
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return this.toString().toLowerCase().indexOf(s.toLowerCase()) > -1;
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}
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};
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ua.version = (ua.toString().toLowerCase().match(/[\s\S]+(?:rv|it|ra|ie)[\/: ]([\d.]+)/) || [])[1];
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ua.webkit = ua.test('webkit');
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ua.gecko = ua.test('gecko') && !ua.webkit;
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ua.opera = ua.test('opera');
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ua.ie = ua.test('msie') && !ua.opera;
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ua.ie6 = ua.ie && document.compatMode && typeof document.documentElement.style.maxHeight === 'undefined';
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ua.ie7 = ua.ie && document.documentElement && typeof document.documentElement.style.maxHeight !== 'undefined' && typeof XDomainRequest === 'undefined';
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ua.ie8 = ua.ie && typeof XDomainRequest !== 'undefined';
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// initialize when DOM content is loaded
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var domReady = function () {
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var fns = [];
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var init = function () {
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if (!arguments.callee.done) { // run init functions once
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arguments.callee.done = true;
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for (var i = 0; i < fns.length; i++) {
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fns[i]();
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}
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}
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};
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// listeners for different browsers
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if (document.addEventListener) {
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document.addEventListener('DOMContentLoaded', init, false);
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}
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if (ua.ie) {
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(function () {
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try {
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// throws errors until after ondocumentready
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document.documentElement.doScroll('left');
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// If we are in an iframe, the above does not work properly.
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// Trying to access the length attribute of document.body, however,
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// does throw an error until ondocumentready, fixing this issue.
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document.body.length;
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}
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catch (e) {
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setTimeout(arguments.callee, 50);
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return;
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}
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// no errors, fire
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init();
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})();
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// trying to always fire before onload
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document.onreadystatechange = function () {
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if (document.readyState === 'complete') {
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document.onreadystatechange = null;
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init();
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}
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};
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}
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if (ua.webkit && document.readyState) {
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(function () {
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if (document.readyState !== 'loading') {
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init();
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}
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else {
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setTimeout(arguments.callee, 10);
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}
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})();
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}
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window.onload = init; // fallback
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return function (fn) { // add fn to init functions
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if (typeof fn === 'function') {
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// If DOM ready has already been fired, fire the function
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// right away.
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if(init.done) {
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fn();
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} else {
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// Add to the queue
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fns[fns.length] = fn;
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}
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}
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return fn;
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};
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}();
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// helper library for parsing css to objects
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var cssHelper = function () {
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var regExp = {
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BLOCKS: /[^\s{][^{]*\{(?:[^{}]*\{[^{}]*\}[^{}]*|[^{}]*)*\}/g,
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BLOCKS_INSIDE: /[^\s{][^{]*\{[^{}]*\}/g,
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DECLARATIONS: /[a-zA-Z\-]+[^;]*:[^;]+;/g,
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RELATIVE_URLS: /url\(['"]?([^\/\)'"][^:\)'"]+)['"]?\)/g,
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// strip whitespace and comments, @import is evil
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REDUNDANT_COMPONENTS: /(?:\/\*([^*\\\\]|\*(?!\/))+\*\/|@import[^;]+;)/g,
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REDUNDANT_WHITESPACE: /\s*(,|:|;|\{|\})\s*/g,
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MORE_WHITESPACE: /\s{2,}/g,
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FINAL_SEMICOLONS: /;\}/g,
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NOT_WHITESPACE: /\S+/g
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};
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var parsed, parsing = false;
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var waiting = [];
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var wait = function (fn) {
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if (typeof fn === 'function') {
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waiting[waiting.length] = fn;
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}
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};
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var ready = function () {
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for (var i = 0; i < waiting.length; i++) {
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waiting[i](parsed);
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}
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};
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var events = {};
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var broadcast = function (n, v) {
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if (events[n]) {
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var listeners = events[n].listeners;
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if (listeners) {
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for (var i = 0; i < listeners.length; i++) {
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listeners[i](v);
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}
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}
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}
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};
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var requestText = function (url, fnSuccess, fnFailure) {
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if (ua.ie && !window.XMLHttpRequest) {
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window.XMLHttpRequest = function () {
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return new ActiveXObject('Microsoft.XMLHTTP');
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};
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}
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if (!XMLHttpRequest) {
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return '';
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}
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var r = new XMLHttpRequest();
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try {
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r.open('get', url, true);
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r.setRequestHeader('X_REQUESTED_WITH', 'XMLHttpRequest');
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}
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catch (e) {
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fnFailure();
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return;
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}
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var done = false;
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setTimeout(function () {
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done = true;
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}, 5000);
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document.documentElement.style.cursor = 'progress';
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r.onreadystatechange = function () {
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if (r.readyState === 4 && !done) {
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if (!r.status && location.protocol === 'file:' ||
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(r.status >= 200 && r.status < 300) ||
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r.status === 304 ||
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navigator.userAgent.indexOf('Safari') > -1 && typeof r.status === 'undefined') {
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fnSuccess(r.responseText);
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}
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else {
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fnFailure();
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}
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document.documentElement.style.cursor = '';
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r = null; // avoid memory leaks
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}
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};
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r.send('');
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};
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var sanitize = function (text) {
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text = text.replace(regExp.REDUNDANT_COMPONENTS, '');
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text = text.replace(regExp.REDUNDANT_WHITESPACE, '$1');
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text = text.replace(regExp.MORE_WHITESPACE, ' ');
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text = text.replace(regExp.FINAL_SEMICOLONS, '}'); // optional final semicolons
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return text;
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};
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var objects = {
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mediaQueryList: function (s) {
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var o = {};
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var idx = s.indexOf('{');
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var lt = s.substring(0, idx);
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s = s.substring(idx + 1, s.length - 1);
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var mqs = [], rs = [];
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// add media queries
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var qts = lt.toLowerCase().substring(7).split(',');
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for (var i = 0; i < qts.length; i++) { // parse each media query
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mqs[mqs.length] = objects.mediaQuery(qts[i], o);
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}
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// add rule sets
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var rts = s.match(regExp.BLOCKS_INSIDE);
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if (rts !== null) {
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for (i = 0; i < rts.length; i++) {
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rs[rs.length] = objects.rule(rts[i], o);
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}
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}
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o.getMediaQueries = function () {
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return mqs;
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};
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o.getRules = function () {
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return rs;
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};
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o.getListText = function () {
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return lt;
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};
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o.getCssText = function () {
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return s;
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};
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return o;
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},
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mediaQuery: function (s, mql) {
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s = s || '';
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var not = false, type;
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var exp = [];
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var valid = true;
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var tokens = s.match(regExp.NOT_WHITESPACE);
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for (var i = 0; i < tokens.length; i++) {
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var token = tokens[i];
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if (!type && (token === 'not' || token === 'only')) { // 'not' and 'only' keywords
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// keyword 'only' does nothing, as if it was not present
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if (token === 'not') {
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not = true;
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}
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}
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else if (!type) { // media type
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type = token;
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}
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else if (token.charAt(0) === '(') { // media feature expression
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var pair = token.substring(1, token.length - 1).split(':');
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exp[exp.length] = {
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mediaFeature: pair[0],
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value: pair[1] || null
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};
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}
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}
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return {
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getList: function () {
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return mql || null;
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},
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getValid: function () {
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return valid;
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},
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getNot: function () {
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return not;
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},
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getMediaType: function () {
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return type;
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},
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getExpressions: function () {
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return exp;
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}
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};
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},
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rule: function (s, mql) {
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var o = {};
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var idx = s.indexOf('{');
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var st = s.substring(0, idx);
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var ss = st.split(',');
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var ds = [];
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var dts = s.substring(idx + 1, s.length - 1).split(';');
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for (var i = 0; i < dts.length; i++) {
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ds[ds.length] = objects.declaration(dts[i], o);
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}
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o.getMediaQueryList = function () {
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return mql || null;
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};
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o.getSelectors = function () {
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return ss;
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};
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o.getSelectorText = function () {
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return st;
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};
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o.getDeclarations = function () {
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return ds;
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};
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o.getPropertyValue = function (n) {
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for (var i = 0; i < ds.length; i++) {
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if (ds[i].getProperty() === n) {
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return ds[i].getValue();
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}
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}
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return null;
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};
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return o;
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},
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declaration: function (s, r) {
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var idx = s.indexOf(':');
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var p = s.substring(0, idx);
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var v = s.substring(idx + 1);
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return {
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getRule: function () {
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return r || null;
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},
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getProperty: function () {
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return p;
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},
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getValue: function () {
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return v;
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}
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};
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}
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};
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var parseText = function (el) {
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if (typeof el.cssHelperText !== 'string') {
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return;
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}
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var o = {
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mediaQueryLists: [],
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rules: [],
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selectors: {},
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declarations: [],
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properties: {}
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};
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// parse blocks and collect media query lists and rules
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var mqls = o.mediaQueryLists;
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var ors = o.rules;
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var blocks = el.cssHelperText.match(regExp.BLOCKS);
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if (blocks !== null) {
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for (var i = 0; i < blocks.length; i++) {
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if (blocks[i].substring(0, 7) === '@media ') { // media query (list)
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mqls[mqls.length] = objects.mediaQueryList(blocks[i]);
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ors = o.rules = ors.concat(mqls[mqls.length - 1].getRules());
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}
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else { // regular rule set, page context (@page) or font description (@font-face)
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ors[ors.length] = objects.rule(blocks[i]);
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}
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}
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}
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// collect selectors
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var oss = o.selectors;
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var collectSelectors = function (r) {
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var ss = r.getSelectors();
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for (var i = 0; i < ss.length; i++) {
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var n = ss[i];
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if (!oss[n]) {
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oss[n] = [];
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}
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oss[n][oss[n].length] = r;
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}
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};
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for (i = 0; i < ors.length; i++) {
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collectSelectors(ors[i]);
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}
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// collect declarations
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var ods = o.declarations;
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for (i = 0; i < ors.length; i++) {
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ods = o.declarations = ods.concat(ors[i].getDeclarations());
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}
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// collect properties
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var ops = o.properties;
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for (i = 0; i < ods.length; i++) {
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var n = ods[i].getProperty();
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if (!ops[n]) {
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ops[n] = [];
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}
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ops[n][ops[n].length] = ods[i];
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}
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el.cssHelperParsed = o;
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parsed[parsed.length] = el;
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return o;
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};
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var parseEmbedded = function (el, s) {
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el.cssHelperText = sanitize(s || el.innerHTML); // bug in IE, where innerHTML gives us parsed css instead of raw literal
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return parseText(el);
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};
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var parse = function () {
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parsing = true;
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parsed = [];
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var linked = [];
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var finish = function () {
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for (var i = 0; i < linked.length; i++) {
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parseText(linked[i]);
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}
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var styles = document.getElementsByTagName('style');
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for (i = 0; i < styles.length; i++) {
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parseEmbedded(styles[i]);
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}
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parsing = false;
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ready();
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};
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var links = document.getElementsByTagName('link');
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for (var i = 0; i < links.length; i++) {
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var link = links[i];
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if (link.getAttribute('rel').indexOf('style') > -1 && link.href && link.href.length !== 0 && !link.disabled) {
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linked[linked.length] = link;
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}
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}
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if (linked.length > 0) {
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var c = 0;
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var checkForFinish = function () {
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c++;
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if (c === linked.length) { // parse in right order, so after last link is read
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finish();
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}
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};
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var processLink = function (link) {
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var href = link.href;
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requestText(href, function (text) {
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// fix url's
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text = sanitize(text).replace(regExp.RELATIVE_URLS, 'url(' + href.substring(0, href.lastIndexOf('/')) + '/$1)');
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link.cssHelperText = text;
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checkForFinish();
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}, checkForFinish);
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};
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for (i = 0; i < linked.length; i++) {
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processLink(linked[i]);
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}
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}
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else {
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finish();
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}
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};
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var types = {
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mediaQueryLists: 'array',
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rules: 'array',
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selectors: 'object',
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declarations: 'array',
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properties: 'object'
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};
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var collections = {
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mediaQueryLists: null,
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rules: null,
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selectors: null,
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declarations: null,
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properties: null
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};
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var addToCollection = function (name, v) {
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if (collections[name] !== null) {
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if (types[name] === 'array') {
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return (collections[name] = collections[name].concat(v));
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}
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else {
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var c = collections[name];
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for (var n in v) {
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if (v.hasOwnProperty(n)) {
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if (!c[n]) {
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c[n] = v[n];
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}
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else {
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c[n] = c[n].concat(v[n]);
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}
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}
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}
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return c;
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}
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}
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};
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var collect = function (name) {
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collections[name] = (types[name] === 'array') ? [] : {};
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for (var i = 0; i < parsed.length; i++) {
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addToCollection(name, parsed[i].cssHelperParsed[name]);
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}
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return collections[name];
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};
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// timer for broadcasting added elements
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domReady(function () {
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var els = document.body.getElementsByTagName('*');
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for (var i = 0; i < els.length; i++) {
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els[i].checkedByCssHelper = true;
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}
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if (document.implementation.hasFeature('MutationEvents', '2.0') || window.MutationEvent) {
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document.body.addEventListener('DOMNodeInserted', function (e) {
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var el = e.target;
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if (el.nodeType === 1) {
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broadcast('DOMElementInserted', el);
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el.checkedByCssHelper = true;
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}
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}, false);
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}
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else {
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setInterval(function () {
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var els = document.body.getElementsByTagName('*');
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for (var i = 0; i < els.length; i++) {
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if (!els[i].checkedByCssHelper) {
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broadcast('DOMElementInserted', els[i]);
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els[i].checkedByCssHelper = true;
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}
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}
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}, 1000);
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}
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});
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// viewport size
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|
var getViewportSize = function (d) {
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if (typeof window.innerWidth != 'undefined') {
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return window["inner" + d];
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}
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else if (typeof document.documentElement != 'undefined'
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&& typeof document.documentElement.clientWidth != 'undefined'
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&& document.documentElement.clientWidth != 0) {
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return document.documentElement["client" + d];
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}
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};
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|
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// public static functions
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|
return {
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addStyle: function (s, process) {
|
|
var el;
|
|
if (null !== document.getElementById('css-mediaqueries-js')) {
|
|
el = document.getElementById('css-mediaqueries-js');
|
|
}
|
|
else {
|
|
el = document.createElement('style');
|
|
el.setAttribute('type', 'text/css');
|
|
el.setAttribute('id', 'css-mediaqueries-js');
|
|
document.getElementsByTagName('head')[0].appendChild(el);
|
|
}
|
|
if (el.styleSheet) { // IE
|
|
el.styleSheet.cssText += s;
|
|
}
|
|
else {
|
|
el.appendChild(document.createTextNode(s));
|
|
}
|
|
el.addedWithCssHelper = true;
|
|
if (typeof process === 'undefined' || process === true) {
|
|
cssHelper.parsed(function (parsed) {
|
|
var o = parseEmbedded(el, s);
|
|
for (var n in o) {
|
|
if (o.hasOwnProperty(n)) {
|
|
addToCollection(n, o[n]);
|
|
}
|
|
}
|
|
broadcast('newStyleParsed', el);
|
|
});
|
|
}
|
|
else {
|
|
el.parsingDisallowed = true;
|
|
}
|
|
return el;
|
|
},
|
|
|
|
removeStyle: function (el) {
|
|
if (el.parentNode)
|
|
return el.parentNode.removeChild(el);
|
|
},
|
|
|
|
parsed: function (fn) {
|
|
if (parsing) {
|
|
wait(fn);
|
|
}
|
|
else {
|
|
if (typeof parsed !== 'undefined') {
|
|
if (typeof fn === 'function') {
|
|
fn(parsed);
|
|
}
|
|
}
|
|
else {
|
|
wait(fn);
|
|
parse();
|
|
}
|
|
}
|
|
},
|
|
|
|
mediaQueryLists: function (fn) {
|
|
cssHelper.parsed(function (parsed) {
|
|
fn(collections.mediaQueryLists || collect('mediaQueryLists'));
|
|
});
|
|
},
|
|
|
|
rules: function (fn) {
|
|
cssHelper.parsed(function (parsed) {
|
|
fn(collections.rules || collect('rules'));
|
|
});
|
|
},
|
|
|
|
selectors: function (fn) {
|
|
cssHelper.parsed(function (parsed) {
|
|
fn(collections.selectors || collect('selectors'));
|
|
});
|
|
},
|
|
|
|
declarations: function (fn) {
|
|
cssHelper.parsed(function (parsed) {
|
|
fn(collections.declarations || collect('declarations'));
|
|
});
|
|
},
|
|
|
|
properties: function (fn) {
|
|
cssHelper.parsed(function (parsed) {
|
|
fn(collections.properties || collect('properties'));
|
|
});
|
|
},
|
|
|
|
broadcast: broadcast,
|
|
|
|
addListener: function (n, fn) { // in case n is 'styleadd': added function is called everytime style is added and parsed
|
|
if (typeof fn === 'function') {
|
|
if (!events[n]) {
|
|
events[n] = {
|
|
listeners: []
|
|
};
|
|
}
|
|
events[n].listeners[events[n].listeners.length] = fn;
|
|
}
|
|
},
|
|
|
|
removeListener: function (n, fn) {
|
|
if (typeof fn === 'function' && events[n]) {
|
|
var ls = events[n].listeners;
|
|
for (var i = 0; i < ls.length; i++) {
|
|
if (ls[i] === fn) {
|
|
ls.splice(i, 1);
|
|
i -= 1;
|
|
}
|
|
}
|
|
}
|
|
},
|
|
|
|
getViewportWidth: function () {
|
|
return getViewportSize("Width");
|
|
},
|
|
|
|
getViewportHeight: function () {
|
|
return getViewportSize("Height");
|
|
}
|
|
};
|
|
}();
|
|
|
|
|
|
|
|
// function to test and apply parsed media queries against browser capabilities
|
|
domReady(function enableCssMediaQueries() {
|
|
var meter;
|
|
|
|
var regExp = {
|
|
LENGTH_UNIT: /[0-9]+(em|ex|px|in|cm|mm|pt|pc)$/,
|
|
RESOLUTION_UNIT: /[0-9]+(dpi|dpcm)$/,
|
|
ASPECT_RATIO: /^[0-9]+\/[0-9]+$/,
|
|
ABSOLUTE_VALUE: /^[0-9]*(\.[0-9]+)*$/
|
|
};
|
|
|
|
var styles = [];
|
|
|
|
var nativeSupport = function () {
|
|
// check support for media queries
|
|
var id = 'css3-mediaqueries-test';
|
|
var el = document.createElement('div');
|
|
el.id = id;
|
|
var style = cssHelper.addStyle('@media all and (width) { #' + id +
|
|
' { width: 1px !important; } }', false); // false means don't parse this temp style
|
|
document.body.appendChild(el);
|
|
var ret = el.offsetWidth === 1;
|
|
style.parentNode.removeChild(style);
|
|
el.parentNode.removeChild(el);
|
|
nativeSupport = function () {
|
|
return ret;
|
|
};
|
|
return ret;
|
|
};
|
|
|
|
var createMeter = function () { // create measuring element
|
|
meter = document.createElement('div');
|
|
meter.style.cssText = 'position:absolute;top:-9999em;left:-9999em;' +
|
|
'margin:0;border:none;padding:0;width:1em;font-size:1em;'; // cssText is needed for IE, works for the others
|
|
document.body.appendChild(meter);
|
|
// meter must have browser default font size of 16px
|
|
if (meter.offsetWidth !== 16) {
|
|
meter.style.fontSize = 16 / meter.offsetWidth + 'em';
|
|
}
|
|
meter.style.width = '';
|
|
};
|
|
|
|
var measure = function (value) {
|
|
meter.style.width = value;
|
|
var amount = meter.offsetWidth;
|
|
meter.style.width = '';
|
|
return amount;
|
|
};
|
|
|
|
var testMediaFeature = function (feature, value) {
|
|
// non-testable features: monochrome|min-monochrome|max-monochrome|scan|grid
|
|
var l = feature.length;
|
|
var min = (feature.substring(0, 4) === 'min-');
|
|
var max = (!min && feature.substring(0, 4) === 'max-');
|
|
|
|
if (value !== null) { // determine value type and parse to usable amount
|
|
var valueType;
|
|
var amount;
|
|
if (regExp.LENGTH_UNIT.exec(value)) {
|
|
valueType = 'length';
|
|
amount = measure(value);
|
|
}
|
|
else if (regExp.RESOLUTION_UNIT.exec(value)) {
|
|
valueType = 'resolution';
|
|
amount = parseInt(value, 10);
|
|
var unit = value.substring((amount + '').length);
|
|
}
|
|
else if (regExp.ASPECT_RATIO.exec(value)) {
|
|
valueType = 'aspect-ratio';
|
|
amount = value.split('/');
|
|
}
|
|
else if (regExp.ABSOLUTE_VALUE) {
|
|
valueType = 'absolute';
|
|
amount = value;
|
|
}
|
|
else {
|
|
valueType = 'unknown';
|
|
}
|
|
}
|
|
|
|
var width, height;
|
|
if ('device-width' === feature.substring(l - 12, l)) { // screen width
|
|
width = screen.width;
|
|
if (value !== null) {
|
|
if (valueType === 'length') {
|
|
return ((min && width >= amount) || (max && width < amount) || (!min && !max && width === amount));
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
else { // test width without value
|
|
return width > 0;
|
|
}
|
|
}
|
|
else if ('device-height' === feature.substring(l - 13, l)) { // screen height
|
|
height = screen.height;
|
|
if (value !== null) {
|
|
if (valueType === 'length') {
|
|
return ((min && height >= amount) || (max && height < amount) || (!min && !max && height === amount));
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
else { // test height without value
|
|
return height > 0;
|
|
}
|
|
}
|
|
else if ('width' === feature.substring(l - 5, l)) { // viewport width
|
|
width = document.documentElement.clientWidth || document.body.clientWidth; // the latter for IE quirks mode
|
|
if (value !== null) {
|
|
if (valueType === 'length') {
|
|
return ((min && width >= amount) || (max && width < amount) || (!min && !max && width === amount));
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
else { // test width without value
|
|
return width > 0;
|
|
}
|
|
}
|
|
else if ('height' === feature.substring(l - 6, l)) { // viewport height
|
|
height = document.documentElement.clientHeight || document.body.clientHeight; // the latter for IE quirks mode
|
|
if (value !== null) {
|
|
if (valueType === 'length') {
|
|
return ((min && height >= amount) || (max && height < amount) || (!min && !max && height === amount));
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
else { // test height without value
|
|
return height > 0;
|
|
}
|
|
}
|
|
else if ('orientation' === feature.substring(l - 11, l)) { // orientation
|
|
|
|
width = document.documentElement.clientWidth || document.body.clientWidth; // the latter for IE quirks mode
|
|
height = document.documentElement.clientHeight || document.body.clientHeight; // the latter for IE quirks mode
|
|
|
|
if (valueType === 'absolute') {
|
|
return (amount === 'portrait') ? (width <= height) : (width > height);
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
else if ('aspect-ratio' === feature.substring(l - 12, l)) { // window aspect ratio
|
|
width = document.documentElement.clientWidth || document.body.clientWidth; // the latter for IE quirks mode
|
|
height = document.documentElement.clientHeight || document.body.clientHeight; // the latter for IE quirks mode
|
|
|
|
var curRatio = width / height;
|
|
var ratio = amount[1] / amount[0];
|
|
|
|
if (valueType === 'aspect-ratio') {
|
|
return ((min && curRatio >= ratio) || (max && curRatio < ratio) || (!min && !max && curRatio === ratio));
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
else if ('device-aspect-ratio' === feature.substring(l - 19, l)) { // screen aspect ratio
|
|
return valueType === 'aspect-ratio' && screen.width * amount[1] === screen.height * amount[0];
|
|
}
|
|
else if ('color-index' === feature.substring(l - 11, l)) { // number of colors
|
|
var colors = Math.pow(2, screen.colorDepth);
|
|
if (value !== null) {
|
|
if (valueType === 'absolute') {
|
|
return ((min && colors >= amount) || (max && colors < amount) || (!min && !max && colors === amount));
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
else { // test height without value
|
|
return colors > 0;
|
|
}
|
|
}
|
|
else if ('color' === feature.substring(l - 5, l)) { // bits per color component
|
|
var color = screen.colorDepth;
|
|
if (value !== null) {
|
|
if (valueType === 'absolute') {
|
|
return ((min && color >= amount) || (max && color < amount) || (!min && !max && color === amount));
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
else { // test height without value
|
|
return color > 0;
|
|
}
|
|
}
|
|
else if ('resolution' === feature.substring(l - 10, l)) {
|
|
var res;
|
|
if (unit === 'dpcm') {
|
|
res = measure('1cm');
|
|
}
|
|
else {
|
|
res = measure('1in');
|
|
}
|
|
if (value !== null) {
|
|
if (valueType === 'resolution') {
|
|
return ((min && res >= amount) || (max && res < amount) || (!min && !max && res === amount));
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
else { // test height without value
|
|
return res > 0;
|
|
}
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
};
|
|
|
|
var testMediaQuery = function (mq) {
|
|
var test = mq.getValid();
|
|
var expressions = mq.getExpressions();
|
|
var l = expressions.length;
|
|
if (l > 0) {
|
|
for (var i = 0; i < l && test; i++) {
|
|
test = testMediaFeature(expressions[i].mediaFeature, expressions[i].value);
|
|
}
|
|
var not = mq.getNot();
|
|
return (test && !not || not && !test);
|
|
}
|
|
};
|
|
|
|
var testMediaQueryList = function (mql) {
|
|
var mqs = mql.getMediaQueries();
|
|
var t = {};
|
|
for (var i = 0; i < mqs.length; i++) {
|
|
if (testMediaQuery(mqs[i])) {
|
|
t[mqs[i].getMediaType()] = true;
|
|
}
|
|
}
|
|
var s = [], c = 0;
|
|
for (var n in t) {
|
|
if (t.hasOwnProperty(n)) {
|
|
if (c > 0) {
|
|
s[c++] = ',';
|
|
}
|
|
s[c++] = n;
|
|
}
|
|
}
|
|
if (s.length > 0) {
|
|
styles[styles.length] = cssHelper.addStyle('@media ' + s.join('') + '{' + mql.getCssText() + '}', false);
|
|
}
|
|
};
|
|
|
|
var testMediaQueryLists = function (mqls) {
|
|
for (var i = 0; i < mqls.length; i++) {
|
|
testMediaQueryList(mqls[i]);
|
|
}
|
|
if (ua.ie) {
|
|
// force repaint in IE
|
|
document.documentElement.style.display = 'block';
|
|
setTimeout(function () {
|
|
document.documentElement.style.display = '';
|
|
}, 0);
|
|
// delay broadcast somewhat for IE
|
|
setTimeout(function () {
|
|
cssHelper.broadcast('cssMediaQueriesTested');
|
|
}, 100);
|
|
}
|
|
else {
|
|
cssHelper.broadcast('cssMediaQueriesTested');
|
|
}
|
|
};
|
|
|
|
var test = function () {
|
|
for (var i = 0; i < styles.length; i++) {
|
|
cssHelper.removeStyle(styles[i]);
|
|
}
|
|
styles = [];
|
|
cssHelper.mediaQueryLists(testMediaQueryLists);
|
|
};
|
|
|
|
var scrollbarWidth = 0;
|
|
var checkForResize = function () {
|
|
var cvpw = cssHelper.getViewportWidth();
|
|
var cvph = cssHelper.getViewportHeight();
|
|
|
|
// determine scrollbar width in IE, see resizeHandler
|
|
if (ua.ie) {
|
|
var el = document.createElement('div');
|
|
el.style.width = '100px';
|
|
el.style.height = '100px';
|
|
el.style.position = 'absolute';
|
|
el.style.top = '-9999em';
|
|
el.style.overflow = 'scroll';
|
|
document.body.appendChild(el);
|
|
scrollbarWidth = el.offsetWidth - el.clientWidth;
|
|
document.body.removeChild(el);
|
|
}
|
|
|
|
var timer;
|
|
var resizeHandler = function () {
|
|
var vpw = cssHelper.getViewportWidth();
|
|
var vph = cssHelper.getViewportHeight();
|
|
// check whether vp size has really changed, because IE also triggers resize event when body size changes
|
|
// 20px allowance to accomodate short appearance of scrollbars in IE in some cases
|
|
if (Math.abs(vpw - cvpw) > scrollbarWidth || Math.abs(vph - cvph) > scrollbarWidth) {
|
|
cvpw = vpw;
|
|
cvph = vph;
|
|
clearTimeout(timer);
|
|
timer = setTimeout(function () {
|
|
if (!nativeSupport()) {
|
|
test();
|
|
}
|
|
else {
|
|
cssHelper.broadcast('cssMediaQueriesTested');
|
|
}
|
|
}, 500);
|
|
}
|
|
};
|
|
|
|
window.onresize = function () {
|
|
var x = window.onresize || function () {}; // save original
|
|
return function () {
|
|
x();
|
|
resizeHandler();
|
|
};
|
|
}();
|
|
};
|
|
|
|
// prevent jumping of layout by hiding everything before painting <body>
|
|
var docEl = document.documentElement;
|
|
docEl.style.marginLeft = '-32767px';
|
|
|
|
// make sure it comes back after a while
|
|
setTimeout(function () {
|
|
docEl.style.marginTop = '';
|
|
}, 20000);
|
|
|
|
return function () {
|
|
if (!nativeSupport()) { // if browser doesn't support media queries
|
|
cssHelper.addListener('newStyleParsed', function (el) {
|
|
testMediaQueryLists(el.cssHelperParsed.mediaQueryLists);
|
|
});
|
|
// return visibility after media queries are tested
|
|
cssHelper.addListener('cssMediaQueriesTested', function () {
|
|
// force repaint in IE by changing width
|
|
if (ua.ie) {
|
|
docEl.style.width = '1px';
|
|
}
|
|
setTimeout(function () {
|
|
docEl.style.width = ''; // undo width
|
|
docEl.style.marginLeft = ''; // undo hide
|
|
}, 0);
|
|
// remove this listener to prevent following execution
|
|
cssHelper.removeListener('cssMediaQueriesTested', arguments.callee);
|
|
});
|
|
createMeter();
|
|
test();
|
|
}
|
|
else {
|
|
docEl.style.marginLeft = ''; // undo visibility hidden
|
|
}
|
|
checkForResize();
|
|
};
|
|
}());
|
|
|
|
|
|
// bonus: hotfix for IE6 SP1 (bug KB823727)
|
|
try {
|
|
document.execCommand("BackgroundImageCache", false, true);
|
|
} catch (e) {}
|