amis2/scss/components/_spinner.scss

@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(359deg);
  }
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(1turn);
  }
}

.is-spin {
  animation: spin 2s linear infinite;
}

.#{$ns}Spinner-overlay {
  position: absolute;
  z-index: 10;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--Spinner-overlay-bg);
  transition: ease-out opacity var(--animation-duration);

  opacity: 0;

  &.in {
    opacity: 1;
  }
}

.#{$ns}Spinner {
  width: var(--Spinner-width);
  height: var(--Spinner-height);
  transform: translateZ(0);
  display: inline-block;
  background: var(--Spinner-bg);
  background-size: 100%;

  &--lg {
    width: var(--Spinner--lg-width);
    height: var(--Spinner--lg-height);
  }

  &--sm {
    width: var(--Spinner--sm-width);
    height: var(--Spinner--sm-height);
  }

  transition: ease-out all var(--animation-duration);

  &--icon {
    background: transparent;
    animation: spin 2s linear infinite;
    width: auto;
    height: auto;
  }
}

// 当启用 overlay 的时候，应该是居中模式。
.#{$ns}Spinner--overlay {
  position: absolute;
  z-index: 11;
  top: 50%;
  left: 50%;
  transform: translate3d(-50%, -50%, 0);
}

.#{$ns}Spinner--overlay.#{$ns}Spinner--lg {
  width: var(--Spinner--lg-width);
  height: var(--Spinner--lg-height);
  line-height: var(--Spinner--lg-height);
}

@include media-breakpoint-up(md) {
  .#{$ns}Layout .#{$ns}Page-body > .#{$ns}Spinner-overlay {
    left: var(--Layout-aside-width);
  }

  .#{$ns}Layout--folded .#{$ns}Page-body > .#{$ns}Spinner-overlay {
    left: var(--Layout-aside--folded-width);
  }
}