systrace/catapult/third_party/polymer/components/paper-spinner/paper-spinner-styles.html

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<dom-module id="paper-spinner-styles">
  <template>
    <style>
      /*
      /**************************/
      /* STYLES FOR THE SPINNER */
      /**************************/

      /*
       * Constants:
       *      ARCSIZE     = 270 degrees (amount of circle the arc takes up)
       *      ARCTIME     = 1333ms (time it takes to expand and contract arc)
       *      ARCSTARTROT = 216 degrees (how much the start location of the arc
       *                                should rotate each time, 216 gives us a
       *                                5 pointed star shape (it's 360/5 * 3).
       *                                For a 7 pointed star, we might do
       *                                360/7 * 3 = 154.286)
       *      SHRINK_TIME = 400ms
       */

      :host {
        display: inline-block;
        position: relative;
        width: 28px;
        height: 28px;

        /* 360 * ARCTIME / (ARCSTARTROT + (360-ARCSIZE)) */
        --paper-spinner-container-rotation-duration: 1568ms;

        /* ARCTIME */
        --paper-spinner-expand-contract-duration: 1333ms;

        /* 4 * ARCTIME */
        --paper-spinner-full-cycle-duration: 5332ms;

        /* SHRINK_TIME */
        --paper-spinner-cooldown-duration: 400ms;
      }

      #spinnerContainer {
        width: 100%;
        height: 100%;

        /* The spinner does not have any contents that would have to be
         * flipped if the direction changes. Always use ltr so that the
         * style works out correctly in both cases. */
        direction: ltr;
      }

      #spinnerContainer.active {
        -webkit-animation: container-rotate var(--paper-spinner-container-rotation-duration) linear infinite;
        animation: container-rotate var(--paper-spinner-container-rotation-duration) linear infinite;
      }

      @-webkit-keyframes container-rotate {
        to { -webkit-transform: rotate(360deg) }
      }

      @keyframes container-rotate {
        to { transform: rotate(360deg) }
      }

      .spinner-layer {
        position: absolute;
        width: 100%;
        height: 100%;
        opacity: 0;
        white-space: nowrap;
        border-color: var(--paper-spinner-color, --google-blue-500);
      }

      .layer-1 {
        border-color: var(--paper-spinner-layer-1-color, --google-blue-500);
      }

      .layer-2 {
        border-color: var(--paper-spinner-layer-2-color, --google-red-500);
      }

      .layer-3 {
        border-color: var(--paper-spinner-layer-3-color, --google-yellow-500);
      }

      .layer-4 {
        border-color: var(--paper-spinner-layer-4-color, --google-green-500);
      }

      /**
       * IMPORTANT NOTE ABOUT CSS ANIMATION PROPERTIES (keanulee):
       *
       * iOS Safari (tested on iOS 8.1) does not handle animation-delay very well - it doesn't
       * guarantee that the animation will start _exactly_ after that value. So we avoid using
       * animation-delay and instead set custom keyframes for each color (as layer-2undant as it
       * seems).
       */
      .active .spinner-layer {
        -webkit-animation-name: fill-unfill-rotate;
        -webkit-animation-duration: var(--paper-spinner-full-cycle-duration);
        -webkit-animation-timing-function: cubic-bezier(0.4, 0.0, 0.2, 1);
        -webkit-animation-iteration-count: infinite;
        animation-name: fill-unfill-rotate;
        animation-duration: var(--paper-spinner-full-cycle-duration);
        animation-timing-function: cubic-bezier(0.4, 0.0, 0.2, 1);
        animation-iteration-count: infinite;
        opacity: 1;
      }

      .active .spinner-layer.layer-1 {
        -webkit-animation-name: fill-unfill-rotate, layer-1-fade-in-out;
        animation-name: fill-unfill-rotate, layer-1-fade-in-out;
      }

      .active .spinner-layer.layer-2 {
        -webkit-animation-name: fill-unfill-rotate, layer-2-fade-in-out;
        animation-name: fill-unfill-rotate, layer-2-fade-in-out;
      }

      .active .spinner-layer.layer-3 {
        -webkit-animation-name: fill-unfill-rotate, layer-3-fade-in-out;
        animation-name: fill-unfill-rotate, layer-3-fade-in-out;
      }

      .active .spinner-layer.layer-4 {
        -webkit-animation-name: fill-unfill-rotate, layer-4-fade-in-out;
        animation-name: fill-unfill-rotate, layer-4-fade-in-out;
      }

      @-webkit-keyframes fill-unfill-rotate {
        12.5% { -webkit-transform: rotate(135deg) } /* 0.5 * ARCSIZE */
        25%   { -webkit-transform: rotate(270deg) } /* 1   * ARCSIZE */
        37.5% { -webkit-transform: rotate(405deg) } /* 1.5 * ARCSIZE */
        50%   { -webkit-transform: rotate(540deg) } /* 2   * ARCSIZE */
        62.5% { -webkit-transform: rotate(675deg) } /* 2.5 * ARCSIZE */
        75%   { -webkit-transform: rotate(810deg) } /* 3   * ARCSIZE */
        87.5% { -webkit-transform: rotate(945deg) } /* 3.5 * ARCSIZE */
        to    { -webkit-transform: rotate(1080deg) } /* 4   * ARCSIZE */
      }

      @keyframes fill-unfill-rotate {
        12.5% { transform: rotate(135deg) } /* 0.5 * ARCSIZE */
        25%   { transform: rotate(270deg) } /* 1   * ARCSIZE */
        37.5% { transform: rotate(405deg) } /* 1.5 * ARCSIZE */
        50%   { transform: rotate(540deg) } /* 2   * ARCSIZE */
        62.5% { transform: rotate(675deg) } /* 2.5 * ARCSIZE */
        75%   { transform: rotate(810deg) } /* 3   * ARCSIZE */
        87.5% { transform: rotate(945deg) } /* 3.5 * ARCSIZE */
        to    { transform: rotate(1080deg) } /* 4   * ARCSIZE */
      }

      @-webkit-keyframes layer-1-fade-in-out {
        0% { opacity: 1 }
        25% { opacity: 1 }
        26% { opacity: 0 }
        89% { opacity: 0 }
        90% { opacity: 1 }
        to { opacity: 1 }
      }

      @keyframes layer-1-fade-in-out {
        0% { opacity: 1 }
        25% { opacity: 1 }
        26% { opacity: 0 }
        89% { opacity: 0 }
        90% { opacity: 1 }
        to { opacity: 1 }
      }

      @-webkit-keyframes layer-2-fade-in-out {
        0% { opacity: 0 }
        15% { opacity: 0 }
        25% { opacity: 1 }
        50% { opacity: 1 }
        51% { opacity: 0 }
        to { opacity: 0 }
      }

      @keyframes layer-2-fade-in-out {
        0% { opacity: 0 }
        15% { opacity: 0 }
        25% { opacity: 1 }
        50% { opacity: 1 }
        51% { opacity: 0 }
        to { opacity: 0 }
      }

      @-webkit-keyframes layer-3-fade-in-out {
        0% { opacity: 0 }
        40% { opacity: 0 }
        50% { opacity: 1 }
        75% { opacity: 1 }
        76% { opacity: 0 }
        to { opacity: 0 }
      }

      @keyframes layer-3-fade-in-out {
        0% { opacity: 0 }
        40% { opacity: 0 }
        50% { opacity: 1 }
        75% { opacity: 1 }
        76% { opacity: 0 }
        to { opacity: 0 }
      }

      @-webkit-keyframes layer-4-fade-in-out {
        0% { opacity: 0 }
        65% { opacity: 0 }
        75% { opacity: 1 }
        90% { opacity: 1 }
        to { opacity: 0 }
      }

      @keyframes layer-4-fade-in-out {
        0% { opacity: 0 }
        65% { opacity: 0 }
        75% { opacity: 1 }
        90% { opacity: 1 }
        to { opacity: 0 }
      }

      .circle-clipper {
        display: inline-block;
        position: relative;
        width: 50%;
        height: 100%;
        overflow: hidden;
        border-color: inherit;
      }

      /**
       * Patch the gap that appear between the two adjacent div.circle-clipper while the
       * spinner is rotating (appears on Chrome 50, Safari 9.1.1, and Edge).
       */
      .spinner-layer::after {
        left: 45%;
        width: 10%;
        border-top-style: solid;
      }

      .spinner-layer::after,
      .circle-clipper::after {
        content: '';
        box-sizing: border-box;
        position: absolute;
        top: 0;
        border-width: var(--paper-spinner-stroke-width, 3px);
        border-color: inherit;
        border-radius: 50%;
      }

      .circle-clipper::after {
        bottom: 0;
        width: 200%;
        border-style: solid;
        border-bottom-color: transparent !important;
      }

      .circle-clipper.left::after {
        left: 0;
        border-right-color: transparent !important;
        -webkit-transform: rotate(129deg);
        transform: rotate(129deg);
      }

      .circle-clipper.right::after {
        left: -100%;
        border-left-color: transparent !important;
        -webkit-transform: rotate(-129deg);
        transform: rotate(-129deg);
      }

      .active .gap-patch::after,
      .active .circle-clipper::after {
        -webkit-animation-duration: var(--paper-spinner-expand-contract-duration);
        -webkit-animation-timing-function: cubic-bezier(0.4, 0.0, 0.2, 1);
        -webkit-animation-iteration-count: infinite;
        animation-duration: var(--paper-spinner-expand-contract-duration);
        animation-timing-function: cubic-bezier(0.4, 0.0, 0.2, 1);
        animation-iteration-count: infinite;
      }

      .active .circle-clipper.left::after {
        -webkit-animation-name: left-spin;
        animation-name: left-spin;
      }

      .active .circle-clipper.right::after {
        -webkit-animation-name: right-spin;
        animation-name: right-spin;
      }

      @-webkit-keyframes left-spin {
        0% { -webkit-transform: rotate(130deg) }
        50% { -webkit-transform: rotate(-5deg) }
        to { -webkit-transform: rotate(130deg) }
      }

      @keyframes left-spin {
        0% { transform: rotate(130deg) }
        50% { transform: rotate(-5deg) }
        to { transform: rotate(130deg) }
      }

      @-webkit-keyframes right-spin {
        0% { -webkit-transform: rotate(-130deg) }
        50% { -webkit-transform: rotate(5deg) }
        to { -webkit-transform: rotate(-130deg) }
      }

      @keyframes right-spin {
        0% { transform: rotate(-130deg) }
        50% { transform: rotate(5deg) }
        to { transform: rotate(-130deg) }
      }

      #spinnerContainer.cooldown {
        -webkit-animation: container-rotate var(--paper-spinner-container-rotation-duration) linear infinite, fade-out var(--paper-spinner-cooldown-duration) cubic-bezier(0.4, 0.0, 0.2, 1);
        animation: container-rotate var(--paper-spinner-container-rotation-duration) linear infinite, fade-out var(--paper-spinner-cooldown-duration) cubic-bezier(0.4, 0.0, 0.2, 1);
      }

      @-webkit-keyframes fade-out {
        0% { opacity: 1 }
        to { opacity: 0 }
      }

      @keyframes fade-out {
        0% { opacity: 1 }
        to { opacity: 0 }
      }
    </style>
  </template>
</dom-module>