'use strict';
!function ($) {
// Default set of media queries
var defaultQueries = {
'default': 'only screen',
landscape: 'only screen and (orientation: landscape)',
portrait: 'only screen and (orientation: portrait)',
retina: 'only screen and (-webkit-min-device-pixel-ratio: 2),' + 'only screen and (min--moz-device-pixel-ratio: 2),' + 'only screen and (-o-min-device-pixel-ratio: 2/1),' + 'only screen and (min-device-pixel-ratio: 2),' + 'only screen and (min-resolution: 192dpi),' + 'only screen and (min-resolution: 2dppx)'
};
var MediaQuery = {
queries: [],
current: '',
/**
* Initializes the media query helper, by extracting the breakpoint list from the CSS and activating the breakpoint watcher.
* @function
* @private
*/
_init: function () {
var self = this;
var extractedStyles = $('.foundation-mq').css('font-family');
var namedQueries;
namedQueries = parseStyleToObject(extractedStyles);
for (var key in namedQueries) {
if (namedQueries.hasOwnProperty(key)) {
self.queries.push({
name: key,
value: 'only screen and (min-width: ' + namedQueries[key] + ')'
});
}
}
this.current = this._getCurrentSize();
this._watcher();
},
/**
* Checks if the screen is at least as wide as a breakpoint.
* @function
* @param {String} size - Name of the breakpoint to check.
* @returns {Boolean} `true` if the breakpoint matches, `false` if it's smaller.
*/
atLeast: function (size) {
var query = this.get(size);
if (query) {
return window.matchMedia(query).matches;
}
return false;
},
/**
* Checks if the screen matches to a breakpoint.
* @function
* @param {String} size - Name of the breakpoint to check, either 'small only' or 'small'. Omitting 'only' falls back to using atLeast() method.
* @returns {Boolean} `true` if the breakpoint matches, `false` if it does not.
*/
is: function (size) {
size = size.trim().split(' ');
if (size.length > 1 && size[1] === 'only') {
if (size[0] === this._getCurrentSize()) return true;
} else {
return this.atLeast(size[0]);
}
return false;
},
/**
* Gets the media query of a breakpoint.
* @function
* @param {String} size - Name of the breakpoint to get.
* @returns {String|null} - The media query of the breakpoint, or `null` if the breakpoint doesn't exist.
*/
get: function (size) {
for (var i in this.queries) {
if (this.queries.hasOwnProperty(i)) {
var query = this.queries[i];
if (size === query.name) return query.value;
}
}
return null;
},
/**
* Gets the current breakpoint name by testing every breakpoint and returning the last one to match (the biggest one).
* @function
* @private
* @returns {String} Name of the current breakpoint.
*/
_getCurrentSize: function () {
var matched;
for (var i = 0; i < this.queries.length; i++) {
var query = this.queries[i];
if (window.matchMedia(query.value).matches) {
matched = query;
}
}
if (typeof matched === 'object') {
return matched.name;
} else {
return matched;
}
},
/**
* Activates the breakpoint watcher, which fires an event on the window whenever the breakpoint changes.
* @function
* @private
*/
_watcher: function () {
var _this = this;
$(window).on('resize.zf.mediaquery', function () {
var newSize = _this._getCurrentSize(),
currentSize = _this.current;
if (newSize !== currentSize) {
// Change the current media query
_this.current = newSize;
// Broadcast the media query change on the window
$(window).trigger('changed.zf.mediaquery', [newSize, currentSize]);
}
});
}
};
Foundation.MediaQuery = MediaQuery;
// matchMedia() polyfill - Test a CSS media type/query in JS.
// Authors & copyright (c) 2012: Scott Jehl, Paul Irish, Nicholas Zakas, David Knight. Dual MIT/BSD license
window.matchMedia || (window.matchMedia = function () {
'use strict';
// For browsers that support matchMedium api such as IE 9 and webkit
var styleMedia = window.styleMedia || window.media;
// For those that don't support matchMedium
if (!styleMedia) {
var style = document.createElement('style'),
script = document.getElementsByTagName('script')[0],
info = null;
style.type = 'text/css';
style.id = 'matchmediajs-test';
script && script.parentNode && script.parentNode.insertBefore(style, script);
// 'style.currentStyle' is used by IE <= 8 and 'window.getComputedStyle' for all other browsers
info = 'getComputedStyle' in window && window.getComputedStyle(style, null) || style.currentStyle;
styleMedia = {
matchMedium: function (media) {
var text = '@media ' + media + '{ #matchmediajs-test { width: 1px; } }';
// 'style.styleSheet' is used by IE <= 8 and 'style.textContent' for all other browsers
if (style.styleSheet) {
style.styleSheet.cssText = text;
} else {
style.textContent = text;
}
// Test if media query is true or false
return info.width === '1px';
}
};
}
return function (media) {
return {
matches: styleMedia.matchMedium(media || 'all'),
media: media || 'all'
};
};
}());
// Thank you: https://github.com/sindresorhus/query-string
function parseStyleToObject(str) {
var styleObject = {};
if (typeof str !== 'string') {
return styleObject;
}
str = str.trim().slice(1, -1); // browsers re-quote string style values
if (!str) {
return styleObject;
}
styleObject = str.split('&').reduce(function (ret, param) {
var parts = param.replace(/\+/g, ' ').split('=');
var key = parts[0];
var val = parts[1];
key = decodeURIComponent(key);
// missing `=` should be `null`:
// http://w3.org/TR/2012/WD-url-20120524/#collect-url-parameters
val = val === undefined ? null : decodeURIComponent(val);
if (!ret.hasOwnProperty(key)) {
ret[key] = val;
} else if (Array.isArray(ret[key])) {
ret[key].push(val);
} else {
ret[key] = [ret[key], val];
}
return ret;
}, {});
return styleObject;
}
Foundation.MediaQuery = MediaQuery;
}(jQuery);
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