iron-media-query.html
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<!--
Copyright (c) 2015 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
-->
<link rel="import" href="../polymer/polymer.html">
<!--
`iron-media-query` can be used to data bind to a CSS media query.
The `query` property is a bare CSS media query.
The `query-matches` property is a boolean representing whether the page matches that media query.
Example:
<iron-media-query query="(min-width: 600px)" query-matches="{{queryMatches}}"></iron-media-query>
@group Iron Elements
@demo demo/index.html
@hero hero.svg
@element iron-media-query
-->
<script>
Polymer({
is: 'iron-media-query',
properties: {
/**
* The Boolean return value of the media query.
*/
queryMatches: {
type: Boolean,
value: false,
readOnly: true,
notify: true
},
/**
* The CSS media query to evaluate.
*/
query: {
type: String,
observer: 'queryChanged'
},
/**
* @type {function(MediaQueryList)}
*/
_boundMQHandler: {
value: function() {
return this.queryHandler.bind(this);
}
},
/**
* @type {MediaQueryList}
*/
_mq: {
value: null
}
},
attached: function() {
this.queryChanged();
},
detached: function() {
this._remove();
},
_add: function() {
if (this._mq) {
this._mq.addListener(this._boundMQHandler);
}
},
_remove: function() {
if (this._mq) {
this._mq.removeListener(this._boundMQHandler);
}
this._mq = null;
},
queryChanged: function() {
this._remove();
var query = this.query;
if (!query) {
return;
}
if (query[0] !== '(') {
query = '(' + query + ')';
}
this._mq = window.matchMedia(query);
this._add();
this.queryHandler(this._mq);
},
queryHandler: function(mq) {
this._setQueryMatches(mq.matches);
}
});
</script>