third_party/polymer/v1_0/components-chromium/iron-media-query/iron-media-query-extracted.js

   1 Polymer({
   2
   3     is: 'iron-media-query',
   4
   5     properties: {
   6
   7       /**
   8        * The Boolean return value of the media query.
   9        */
  10       queryMatches: {
  11         type: Boolean,
  12         value: false,
  13         readOnly: true,
  14         notify: true
  15       },
  16
  17       /**
  18        * The CSS media query to evaluate.
  19        */
  20       query: {
  21         type: String,
  22         observer: 'queryChanged'
  23       }
  24
  25     },
  26
  27     created: function() {
  28       this._mqHandler = this.queryHandler.bind(this);
  29     },
  30
  31     queryChanged: function(query) {
  32       if (this._mq) {
  33         this._mq.removeListener(this._mqHandler);
  34       }
  35       if (query[0] !== '(') {
  36         query = '(' + query + ')';
  37       }
  38       this._mq = window.matchMedia(query);
  39       this._mq.addListener(this._mqHandler);
  40       this.queryHandler(this._mq);
  41     },
  42
  43     queryHandler: function(mq) {
  44       this._setQueryMatches(mq.matches);
  45     }
  46
  47   });