chrome-devtools-frontend/front_end/ui/components/spinners/Spinner.ts

Chrome DevTools UI

// Copyright 2024 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/* eslint-disable rulesdir/no-lit-render-outside-of-view */

import {html, render} from '../../lit/lit.js';

import spinnerStyles from './spinner.css.js';

export class Spinner extends HTMLElement {
  readonly #shadow = this.attachShadow({mode: 'open'});

  connectedCallback(): void {
    // The radius of the circles are set to 2.75rem as per implementation
    // of indeterminate progress indicator in
    // https://github.com/material-components/material-components-web/tree/master/packages/mdc-circular-progress.
    // Changing the value of the radius will cause errors in animation.
    // clang-format off
    render(html`
      <style>${spinnerStyles}</style>
      <div class="indeterminate-spinner">
        <div class="left-circle">
          <svg viewBox="0 0 100 100">
            <circle cx="50%" cy="50%" r="2.75rem"></circle></svg>
        </div>
        <div class="center-circle">
          <svg viewBox="0 0 100 100">
            <circle cx="50%" cy="50%" r="2.75rem"></circle></svg>
        </div>
        <div class="right-circle">
          <svg viewBox="0 0 100 100">
            <circle cx="50%" cy="50%" r="2.75rem"></circle></svg>
        </div>
      </div>
    `, this.#shadow, {host: this});
    // clang-format on
  }
}

customElements.define('devtools-spinner', Spinner);

declare global {
  interface HTMLElementTagNameMap {
    'devtools-spinner': Spinner;
  }
}