tinypilot/app/templates/custom-elements/progress-spinner.html at master · tiny-pilot/tinypilot · GitHub

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<template id="progress-spinner-template">
  <style>
    @import "css/style.css";

    :host {
      --size: 5rem;
      --thickness: 10px;
      --color-circle: var(--brand-metallic-bright);
      --color-rotor: var(--brand-blue);
      display: inline-block;
    }

    .spinner {
      margin: auto;
      width: var(--size);
      height: var(--size);
      border-width: var(--thickness);
      border-style: solid;
      border-color: var(--color-circle);
      border-top-color: var(--color-rotor);
      border-radius: 50%;
      animation: spin 1.5s linear infinite;
      box-sizing: border-box;
    }

    @keyframes spin {
      0% {
        transform: rotate(0deg);
      }
      100% {
        transform: rotate(360deg);
      }
    }
  </style>
  <div class="spinner"></div>
</template>

<script type="module">
  (function () {
    const template = document.querySelector("#progress-spinner-template");

    customElements.define(
      "progress-spinner",
      class extends HTMLElement {
        constructor() {
          super();
        }

        connectedCallback() {
          this.attachShadow({ mode: "open" }).appendChild(
            template.content.cloneNode(true)
          );
        }
      }
    );
  })();
</script>