chrome/browser/resources/pdf/elements/viewer-button/viewer-button.js

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 (function() {
   6   var dpi = '';
   7
   8   Polymer({
   9     is: 'viewer-button',
  10
  11     properties: {
  12       img: {
  13         type: String,
  14         observer: 'imgChanged'
  15       },
  16
  17       latchable: {
  18         type: Boolean,
  19         observer: 'latchableChanged'
  20       }
  21     },
  22
  23     created: function() {
  24       if (!dpi) {
  25         var mql = window.matchMedia('(-webkit-min-device-pixel-ratio: 1.3');
  26         dpi = mql.matches ? 'hi' : 'low';
  27       }
  28     },
  29
  30     imgChanged: function() {
  31       if (this.img) {
  32         this.$.icon.style.backgroundImage =
  33             'url(' + this.getAttribute('assetpath') + 'img/' + dpi +
  34             'DPI/' + this.img + ')';
  35       } else {
  36         this.$.icon.style.backgroundImage = '';
  37       }
  38     },
  39
  40     latchableChanged: function() {
  41       if (this.latchable)
  42         this.classList.add('latchable');
  43       else
  44         this.classList.remove('latchable');
  45     },
  46   });
  47 })();