paper-spinner-lite.js

/**
@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
*/
import '@polymer/polymer/polymer-legacy.js';
import '@polymer/paper-styles/color.js';
import './paper-spinner-styles.js';

import {Polymer} from '@polymer/polymer/lib/legacy/polymer-fn.js';
import {html} from '@polymer/polymer/lib/utils/html-tag.js';

import {PaperSpinnerBehavior} from './paper-spinner-behavior.js';

/**
Material design: [Progress &
activity](https://www.google.com/design/spec/components/progress-activity.html)

Element providing a single color material design circular spinner.

    <paper-spinner-lite active></paper-spinner-lite>

The default spinner is blue. It can be customized to be a different color.

### Accessibility

Alt attribute should be set to provide adequate context for accessibility. If
not provided, it defaults to 'loading'. Empty alt can be provided to mark the
element as decorative if alternative content is provided in another form (e.g. a
text block following the spinner).

    <paper-spinner-lite alt="Loading contacts list" active></paper-spinner-lite>

### Styling

The following custom properties and mixins are available for styling:

Custom property | Description | Default
----------------|-------------|----------
`--paper-spinner-color` | Color of the spinner | `--google-blue-500`
`--paper-spinner-stroke-width` | The width of the spinner stroke | 3px

@element paper-spinner-lite
@demo demo/index.html
*/
Polymer({
  /** @override */
  _template: html`
    <style include="paper-spinner-styles"></style>

    <div id="spinnerContainer" class-name="[[__computeContainerClasses(active, __coolingDown)]]" on-animationend="__reset" on-webkit-animation-end="__reset">
      <div class="spinner-layer">
        <div class="circle-clipper left">
          <div class="circle"></div>
        </div>
        <div class="circle-clipper right">
          <div class="circle"></div>
        </div>
      </div>
    </div>
  `,

  is: 'paper-spinner-lite',

  behaviors: [PaperSpinnerBehavior],

  /** @override */
  registered() {
    this._template.setAttribute('strip-whitespace', '');
  }
});