loading.less

@import '../common/style/base.less';

@loading: ~'@{prefix}-loading';

@loading-color: var(--td-loading-color, @brand-color);
@loading-text-color: var(--td-loading-text-color, @text-color-primary);
@loading-text-font: var(--td-loading-text-font, @font-body-small);
@loading-z-index: var(--td-loading-z-index, 3500);
@loading-full-bg-color: var(--td-loading-full-bg-color, rgba(255, 255, 255, 0.6));

.@{loading} {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  &--fullscreen {
    position: fixed;
    display: flex;
    align-items: center;
    vertical-align: middle;
    justify-content: center;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: @loading-z-index;
    background-color: @loading-full-bg-color;
  }

  &__spinner {
    position: relative;
    box-sizing: border-box;
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    animation: rotate 0.8s linear infinite;
    color: @loading-color;

    &.reverse {
      animation-name: rotateReverse;
    }

    &--spinner {
      animation-timing-function: steps(12);
      color: @text-color-primary;

      .@{loading}__dot {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;

        &::before {
          display: block;
          width: 5rpx;
          height: 25%;
          margin: 0 auto;
          background-color: @loading-color;
          border-radius: 40%;
          content: ' ';
        }
      }
    }

    &--circular {
      .@{loading}__circular {
        border-radius: 100%;
        width: 100%;
        height: 100%;
        background: conic-gradient(
          from 180deg at 50% 50%,
          rgba(255, 255, 255, 0) 0deg,
          rgba(255, 255, 255, 0) 60deg,
          @loading-color 330deg,
          rgba(255, 255, 255, 0) 360deg
        );

        // skyline 下，1. mask 不支持渐变只支持图片；2. conic-gradient() 多层渐变效果不符合预期。问题一：改用伪元素+背景色实现，背景色灵活性会降低，待支持渐变后建议恢复用 mask 实现。问题二：待定
        // skyline: ✅ mask-image: image(url("xx"));
        // skyline: ❌ mask-image: linear-gradient(x);

        // mask: radial-gradient(transparent calc(50% - 1rpx), #fff 50%);
        // /* stylelint-disable-next-line */
        // -webkit-mask: radial-gradient(transparent calc(50% - 1rpx), #fff 50%);

        &::after {
          content: '';
          position: absolute;
          top: 50%;
          left: 50%;
          transform: translate(-50%, -50%);
          border-radius: 100%;
          background-color: @bg-color-container;
          width: 70%;
          height: 70%;
        }
      }
    }

    &--dots {
      display: flex;
      justify-content: space-between;
      align-items: center;
      animation: none;

      .@{loading}__dot {
        width: 20%;
        height: 20%;
        border-radius: 50%;
        background-color: @loading-color;
        animation-duration: 1.8s;
        animation-name: dotting;
        animation-timing-function: linear;
        animation-iteration-count: infinite;
        animation-fill-mode: both;
      }
    }
  }

  &__text {
    color: @loading-text-color;
    font: @loading-text-font;

    &--vertical:not(:first-child):not(:empty) {
      margin-top: 12rpx;
    }

    &--horizontal:not(:first-child):not(:empty) {
      margin-left: 16rpx;
    }
  }

  &--vertical {
    flex-direction: column;
  }

  &--horizontal {
    flex-direction: row;
    vertical-align: top;
  }
}

@keyframes t-bar {
  0% {
    width: 0;
  }

  50% {
    width: 70%;
  }

  100% {
    width: 80%;
  }
}

@keyframes t-bar-loaded {
  0% {
    height: 6rpx;
    opacity: 1;
    width: 90%;
  }

  50% {
    height: 6rpx;
    opacity: 1;
    width: 100%;
  }

  100% {
    height: 0;
    opacity: 0;
    width: 100%;
  }
}

.generate(@n, @i: 1) when (@i =< @n) {
  .@{loading}__dot-@{i} {
    transform: rotate(@i * 30deg);
    opacity: (1 / 12) * (@i - 1);
  }
  .generate(@n, (@i + 1));
}
.generate(12);

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

  to {
    transform: rotate(360deg);
  }
}

@keyframes rotateReverse {
  from {
    transform: rotate(360deg);
  }

  to {
    transform: rotate(0deg);
  }
}

@keyframes dotting {
  0% {
    opacity: 0.15;
  }

  1% {
    opacity: 0.8;
  }

  33% {
    opacity: 0.8;
  }

  34% {
    opacity: 0.15;
  }

  100% {
    opacity: 0.15;
  }
}