jellyfin-web/dashboard-ui/bower_components/iron-media-query/iron-media-query.html

<!--
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'
      },

      /**
       * If true, the query attribute is assumed to be a complete media query
       * string rather than a single media feature.
       */
      full: {
        type: Boolean,
        value: false
      },

      /**
       * @type {function(MediaQueryList)}
       */
      _boundMQHandler: {
        value: function() {
          return this.queryHandler.bind(this);
        }
      },

      /**
       * @type {MediaQueryList}
       */
      _mq: {
        value: null
      }
    },

    attached: function() {
      this.style.display = 'none';
      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 (!this.full && query[0] !== '(') {
        query = '(' + query + ')';
      }
      this._mq = window.matchMedia(query);
      this._add();
      this.queryHandler(this._mq);
    },

    queryHandler: function(mq) {
      this._setQueryMatches(mq.matches);
    }

  });

</script>