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core-media-query.html
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core-media-query.html
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<!--
Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->
<!--
/**
* @group Polymer Core Elements
* @element core-media-query
* @status beta
* @homepage github.io
*
* core-media-query can be used to data bind to a CSS media query.
* The "query" property is a bare CSS media query.
* The "queryMatches" property will be a boolean representing if the page matches that media query.
*
* core-media-query uses media query listeners to dynamically update the "queryMatches" property.
* A "core-media-change" event also fires when queryMatches changes.
*
* Example:
*
* <core-media-query query="max-width: 640px" queryMatches="{{phoneScreen}}"></core-media-query>
*
*/
/**
* Fired when the media query state changes
*
* @event core-media-change
*/
-->
<link rel="import" href="../polymer/polymer.html">
<polymer-element name="core-media-query" attributes="query queryMatches">
<template>
<style>
:host {
display: none;
}
</style>
</template>
<script>
Polymer('core-media-query', {
/**
* The Boolean return value of the media query
*
* @attribute queryMatches
* @type Boolean
* @default false
*/
queryMatches: false,
/**
* The CSS media query to evaulate
*
* @attribute query
* @type string
* @default ''
*/
query: '',
ready: function() {
this._mqHandler = this.queryHandler.bind(this);
this._mq = null;
},
queryChanged: function() {
if (this._mq) {
this._mq.removeListener(this._mqHandler);
}
var query = this.query;
if (query[0] !== '(') {
query = '(' + this.query + ')';
}
this._mq = window.matchMedia(query);
this._mq.addListener(this._mqHandler);
this.queryHandler(this._mq);
},
queryHandler: function(mq) {
this.queryMatches = mq.matches;
this.asyncFire('core-media-change', mq);
}
});
</script>
</polymer-element>