third_party/polymer/v1_0/components-chromium/paper-spinner/paper-spinner-extracted.js

   1
   2
   3     Polymer({
   4
   5       is: 'paper-spinner',
   6
   7       listeners: {
   8         'animationend': 'reset',
   9         'webkitAnimationEnd': 'reset'
  10       },
  11
  12       properties: {
  13
  14         /**
  15          * Displays the spinner.
  16          *
  17          * @attribute active
  18          * @type boolean
  19          * @default false
  20          */
  21         active: {
  22           type: Boolean,
  23           value: false,
  24           reflectToAttribute: true,
  25           observer: '_activeChanged'
  26         },
  27
  28         /**
  29          * Alternative text content for accessibility support.
  30          * If alt is present, it will add an aria-label whose content matches alt when active.
  31          * If alt is not present, it will default to 'loading' as the alt value.
  32          *
  33          * @attribute alt
  34          * @type string
  35          * @default 'loading'
  36          */
  37         alt: {
  38           type: String,
  39           value: 'loading',
  40           observer: '_altChanged'
  41         },
  42
  43         /**
  44          * True when the spinner is going from active to inactive. This is represented by a fade
  45          * to 0% opacity to the user.
  46          */
  47         _coolingDown: {
  48           type: Boolean,
  49           value: false
  50         },
  51
  52         _spinnerContainerClassName: {
  53           type: String,
  54           computed: '_computeSpinnerContainerClassName(active, _coolingDown)'
  55         }
  56
  57       },
  58
  59       _computeSpinnerContainerClassName: function(active, coolingDown) {
  60         return [
  61           active || coolingDown ? 'active' : '',
  62           coolingDown ? 'cooldown' : ''
  63         ].join(' ');
  64       },
  65
  66       _activeChanged: function(active, old) {
  67         this._setAriaHidden(!active);
  68         if (!active && old) {
  69           this._coolingDown = true;
  70         }
  71       },
  72
  73       _altChanged: function(alt) {
  74         // user-provided `aria-label` takes precedence over prototype default
  75         if (alt === this.getPropertyInfo('alt').value) {
  76           this.alt = this.getAttribute('aria-label') || alt;
  77         } else {
  78           this._setAriaHidden(alt==='');
  79           this.setAttribute('aria-label', alt);
  80         }
  81       },
  82
  83       _setAriaHidden: function(hidden) {
  84         var attr = 'aria-hidden';
  85         if (hidden) {
  86           this.setAttribute(attr, 'true');
  87         } else {
  88           this.removeAttribute(attr);
  89         }
  90       },
  91
  92       reset: function() {
  93         this.active = false;
  94         this._coolingDown = false;
  95       }
  96
  97     });
  98
  99