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<!--
@license
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">
<script>
/** @polymerBehavior */
Polymer.PaperSpinnerBehavior = {
listeners: {
'animationend': '__reset',
'webkitAnimationEnd': '__reset'
},
properties: {
/**
* Displays the spinner.
*/
active: {
type: Boolean,
value: false,
reflectToAttribute: true,
observer: '__activeChanged'
},
/**
* Alternative text content for accessibility support.
* If alt is present, it will add an aria-label whose content matches alt when active.
* If alt is not present, it will default to 'loading' as the alt value.
*/
alt: {
type: String,
value: 'loading',
observer: '__altChanged'
},
__coolingDown: {
type: Boolean,
value: false
}
},
__computeContainerClasses: function(active, coolingDown) {
return [
active || coolingDown ? 'active' : '',
coolingDown ? 'cooldown' : ''
].join(' ');
},
__activeChanged: function(active, old) {
this.__setAriaHidden(!active);
this.__coolingDown = !active && old;
},
__altChanged: function(alt) {
// user-provided `aria-label` takes precedence over prototype default
if (alt === this.getPropertyInfo('alt').value) {
this.alt = this.getAttribute('aria-label') || alt;
} else {
this.__setAriaHidden(alt==='');
this.setAttribute('aria-label', alt);
}
},
__setAriaHidden: function(hidden) {
var attr = 'aria-hidden';
if (hidden) {
this.setAttribute(attr, 'true');
} else {
this.removeAttribute(attr);
}
},
__reset: function() {
this.active = false;
this.__coolingDown = false;
}
};
</script>
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