Commit 1943fb61 authored by webchick's avatar webchick

Issue #1815602 by jessebeach, attiks, Jelle_S, gmclelland, Wim Leers:...

Issue #1815602 by jessebeach, attiks, Jelle_S, gmclelland, Wim Leers: Introduce a polyfill for matchMedia.
parent fce50c0b
/**
* Polyfill the behavior of window.matchMedia.
*
* @see http://dev.w3.org/csswg/cssom-view/#widl-Window-matchMedia-MediaQueryList-DOMString-query
*
* Test whether a CSS media type or media query applies. Register listeners
* to MediaQueryList objects.
*
* Adapted from https://github.com/paulirish/matchMedia.js with the addition
* of addListener and removeListener. The polyfill referenced above uses
* polling to trigger registered listeners on matchMedia tests.
* This polyfill triggers tests on window resize and orientationchange.
*/
window.matchMedia = window.matchMedia || (function (doc, window) {
"use strict";
var docElem = doc.documentElement;
var refNode = docElem.firstElementChild || docElem.firstChild;
// fakeBody required for <FF4 when executed in <head>.
var fakeBody = doc.createElement("body");
var div = doc.createElement("div");
div.id = "mq-test-1";
div.style.cssText = "position:absolute;top:-100em";
fakeBody.style.background = "none";
fakeBody.appendChild(div);
/**
* A replacement for the native MediaQueryList object.
*
* @param {String} q
* A media query e.g. "screen" or "screen and (min-width: 28em)".
*/
function MediaQueryList (q) {
this.media = q;
this.matches = false;
this.check.call(this);
}
/**
* Polyfill the addListener and removeListener methods.
*/
MediaQueryList.prototype = {
listeners: [],
/**
* Perform the media query application check.
*/
check: function () {
var isApplied;
div.innerHTML = "&shy;<style media=\"" + this.media + "\"> #mq-test-1 {width: 42px;}</style>";
docElem.insertBefore(fakeBody, refNode);
isApplied = div.offsetWidth === 42;
docElem.removeChild(fakeBody);
this.matches = isApplied;
},
/**
* Polyfill the addListener method of the MediaQueryList object.
*
* @param {Function} callback
* The callback to be invoked when the media query is applicable.
*
* @return {Object MediaQueryList}
* A MediaQueryList object that indicates whether the registered media
* query applies. The matches property is true when the media query
* applies and false when not. The original media query is referenced in
* the media property.
*/
addListener: function (callback) {
var handler = (function (mql, debounced) {
return function () {
mql.check();
debounced.call(mql, mql);
};
}(this, debounce(callback, 250)));
this.listeners.push({
'callback': callback,
'handler': handler
});
// Associate the handler to the resize and orientationchange events.
if ('addEventListener' in window) {
window.addEventListener('resize', handler);
window.addEventListener('orientationchange', handler);
}
else if ('attachEvent' in window) {
window.attachEvent('onresize', handler);
window.attachEvent('onorientationchange', handler);
}
},
/**
* Polyfill the removeListener method of the MediaQueryList object.
*
* @param {Function} callback
* The callback to be removed from the set of listeners.
*/
removeListener: function (callback) {
for (var i = 0, listeners = this.listeners; i < listeners.length; i++) {
if (listeners[i].callback === callback) {
// Disassociate the handler to the resize and orientationchange events.
if ('removeEventListener' in window) {
window.removeEventListener('resize', listeners[i].handler);
window.removeEventListener('orientationchange', listeners[i].handler);
}
else if ('detachEvent' in window) {
window.detachEvent('onresize', listeners[i].handler);
window.detachEvent('onorientationchange', listeners[i].handler);
}
listeners.splice(i, 1);
}
}
}
};
/**
* Limits the invocations of a function in a given time frame.
*
* @param {Function} callback
* The function to be invoked.
*
* @param {Number} wait
* The time period within which the callback function should only be
* invoked once. For example if the wait period is 250ms, then the callback
* will only be called at most 4 times per second.
*/
function debounce (callback, wait) {
var timeout, result;
return function () {
var context = this;
var args = arguments;
var later = function () {
timeout = null;
result = callback.apply(context, args);
};
window.clearTimeout(timeout);
timeout = window.setTimeout(later, wait);
return result;
};
}
/**
* Return a MediaQueryList.
*
* @param {String} q
* A media query e.g. "screen" or "screen and (min-width: 28em)". The media
* query is checked for applicability before the object is returned.
*/
return function (q) {
// Build a new MediaQueryList object with the result of the check.
return new MediaQueryList(q);
};
}(document, window));
......@@ -1380,6 +1380,16 @@ function system_library_info() {
),
);
// matchMedia polyfill.
$libraries['matchmedia'] = array(
'title' => 'window.matchMedia polyfill',
'website' => 'http://drupal.org/node/1815602',
'version' => VERSION,
'js' => array(
'core/misc/matchmedia.js' => array(),
),
);
// Farbtastic.
$libraries['jquery.farbtastic'] = array(
'title' => 'Farbtastic',
......
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