third_party/polymer/components-chromium/core-media-query/core-media-query-extracted.js

   1
   2     Polymer('core-media-query', {
   3
   4       /**
   5        * The Boolean return value of the media query
   6        *
   7        * @attribute queryMatches
   8        * @type Boolean
   9        * @default false
  10        */
  11       queryMatches: false,
  12
  13       /**
  14        * The CSS media query to evaulate
  15        *
  16        * @attribute query
  17        * @type string
  18        * @default ''
  19        */
  20       query: '',
  21       ready: function() {
  22         this._mqHandler = this.queryHandler.bind(this);
  23         this._mq = null;
  24       },
  25       queryChanged: function() {
  26         if (this._mq) {
  27           this._mq.removeListener(this._mqHandler);
  28         }
  29         var query = this.query;
  30         if (query[0] !== '(') {
  31           query = '(' + this.query + ')';
  32         }
  33         this._mq = window.matchMedia(query);
  34         this._mq.addListener(this._mqHandler);
  35         this.queryHandler(this._mq);
  36       },
  37       queryHandler: function(mq) {
  38         this.queryMatches = mq.matches;
  39         this.asyncFire('core-media-change', mq);
  40       }
  41     });
  42