vant-weapp/packages/button/index.less

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

.van-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  padding: 0;
  text-align: center;
  vertical-align: middle;
  -webkit-appearance: none;
  -webkit-text-size-adjust: 100%;
  height: var(--button-default-height, @button-default-height);
  line-height: var(--button-line-height, @button-line-height);
  font-size: var(--button-default-font-size, @button-default-font-size);
  transition: opacity @animation-duration-fast;
  border-radius: var(--button-border-radius, @button-border-radius);

  &::before {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    border: inherit;
    border-radius: inherit; /* inherit parent's border radius */
    transform: translate(-50%, -50%);
    opacity: 0;
    content: ' ';
    background-color: @black;
    border-color: @black;
  }

  // reset weapp default border
  &::after {
    border-width: 0;
  }

  &--active::before {
    opacity: 0.15;
  }

  &--unclickable::after {
    display: none;
  }

  &--default {
    color: var(--button-default-color, @button-default-color);
    background: var(
      --button-default-background-color,
      @button-default-background-color
    );
    border: var(--button-border-width, @button-border-width) solid
      var(--button-default-border-color, @button-default-border-color);
  }

  &--primary {
    color: var(--button-primary-color, @button-primary-color);
    background: var(
      --button-primary-background-color,
      @button-primary-background-color
    );
    border: var(--button-border-width, @button-border-width) solid
      var(--button-primary-border-color, @button-primary-border-color);
  }

  &--info {
    color: var(--button-info-color, @button-info-color);
    background: var(
      --button-info-background-color,
      @button-info-background-color
    );
    border: var(--button-border-width, @button-border-width) solid
      var(--button-info-border-color, @button-info-border-color);
  }

  &--danger {
    color: var(--button-danger-color, @button-danger-color);
    background: var(
      --button-danger-background-color,
      @button-danger-background-color
    );
    border: var(--button-border-width, @button-border-width) solid
      var(--button-danger-border-color, @button-danger-border-color);
  }

  &--warning {
    color: var(--button-warning-color, @button-warning-color);
    background: var(
      --button-warning-background-color,
      @button-warning-background-color
    );
    border: var(--button-border-width, @button-border-width) solid
      var(--button-warning-border-color, @button-warning-border-color);
  }

  &--plain {
    background: var(
      --button-plain-background-color,
      @button-plain-background-color
    );

    &.van-button--primary {
      color: var(
        --button-primary-background-color,
        @button-primary-background-color
      );
    }

    &.van-button--info {
      color: var(--button-info-background-color, @button-info-background-color);
    }

    &.van-button--danger {
      color: var(
        --button-danger-background-color,
        @button-danger-background-color
      );
    }

    &.van-button--warning {
      color: var(
        --button-warning-background-color,
        @button-warning-background-color
      );
    }
  }

  &--large {
    width: 100%;
    height: var(--button-large-height, @button-large-height);
  }

  &--normal {
    padding: 0 15px;
    font-size: var(--button-normal-font-size, @button-normal-font-size);
  }

  &--small {
    min-width: var(--button-small-min-width, @button-small-min-width);
    height: var(--button-small-height, @button-small-height);
    padding: 0 var(--padding-xs, @padding-xs);
    font-size: var(--button-small-font-size, @button-small-font-size);
  }

  // mini图标默认宽度50px，文字不能超过4个
  &--mini {
    display: inline-block;
    min-width: var(--button-mini-min-width, @button-mini-min-width);
    height: var(--button-mini-height, @button-mini-height);
    font-size: var(--button-mini-font-size, @button-mini-font-size);

    & + .van-button--mini {
      margin-left: 5px;
    }
  }

  &--block {
    display: flex;
    width: 100%;
  }

  &--round {
    border-radius: var(
      --button-round-border-radius,
      @button-round-border-radius
    );
  }

  &--square {
    border-radius: 0;
  }

  &--disabled {
    opacity: var(--button-disabled-opacity, @button-disabled-opacity);
  }

  &__text {
    display: inline;
  }

  &__loading-text,
  &__icon + &__text:not(:empty) {
    margin-left: @padding-base;
  }

  &__icon {
    min-width: 1em;
    line-height: inherit !important;
    vertical-align: top;
  }

  &--hairline {
    padding-top: 1px; // add 1px padding for text vertical align middle
    border-width: 0;

    &::after {
      border-color: inherit;
      border-width: 1px;
      border-radius: calc(
        var(--button-border-radius, @button-border-radius) * 2
      );
    }

    &.van-button--round::after {
      border-radius: var(
        --button-round-border-radius,
        @button-round-border-radius
      );
    }

    &.van-button--square::after {
      border-radius: 0;
    }
  }
}