amis/scss/components/form/_nested-select.scss

.#{$ns}NestedSelect {
  display: inline-flex;
  vertical-align: middle;
  outline: none;
  position: relative;
  border: $Form-select-borderWidth solid $Form-select-borderColor;
  background: $Form-select-bg;
  border-radius: $Form-select-borderRadius;
  height: $Form-selectOption-height;
  $paddingY: (
      $Form-selectOption-height - $Form-input-lineHeight * $Form-input-fontSize -
        $Form-select-borderWidth * 2
    )/2;
  padding: $paddingY 0 $paddingY $Form-select-paddingX;
  cursor: pointer;
  color: $Form-select-color;

  &.is-disabled {
    color: $text--muted-color;
    background: $Form-input-onDisabled-bg;
    border-color: $Form-input-onDisabled-borderColor;
  }

  &.is-focused,
  &.is-opened {
    border-color: $Form-input-onFocused-borderColor;
    // border-bottom: 0;

    @if ($Form-select-onFocused-color !=$Form-select-color) {
      color: $Form-select-onFocused-color;
    }
  }

  &.is-opened {
    .#{$ns}Select-arrow:before {
      transform: rotate(180deg);
    }
  }

  &:not(.is-disabled):hover {
    background: $Form-select-onHover-bg;
  }

  &--multi {
    .#{$ns}Select-value {
      position: static;
      user-select: none;
      line-height: $Form-input-lineHeight * $Form-input-fontSize - px2rem(2px);
      display: inline-block;
      vertical-align: middle;
      font-size: $Form-selectValue-fontSize;
      color: $Form-selectValue-color;
      background: $Form-selectValue-bg;
      border: px2rem(1px) solid $Form-selectValue-borderColor;
      border-radius: px2rem(2px);
      margin-right: $gap-xs;
      margin-bottom: $gap-xs;
    }
    .#{$ns}Select-valueLabel {
      padding: 0 $gap-xs;
    }
  }

  &-placeholder {
    color: $Form-select-placeholderColor;
    line-height: $Form-input-lineHeight;
  }

  &-valueWrap {
    user-select: none;
    position: relative;
    flex-grow: 1;
  }

  &-clear {
    padding: px2rem(3px);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2;

    svg {
      fill: $Form-input-iconColor;
      width: px2rem(10px);
      height: px2rem(10px);
    }

    &:hover svg {
      fill: darken($color: $Form-input-iconColor, $amount: 20%);
    }
  }

  &-optionArrowRight {
    display: inline-block;
    position: absolute;
    right: px2rem(10px);

    svg {
      width: px2rem(12px);
      height: px2rem(12px);
      fill: $Form-input-iconColor;
    }
  }

  &-menuOuter {
    display: flex;
  }

  &-menu {
    min-width: px2rem(120px);
    max-height: px2rem(300px);
    background: $Form-select-menu-bg;
    color: $Form-select-menu-color;
    border: $Form-select-outer-borderWidth solid
      $Form-input-onFocused-borderColor;
    box-shadow: $Form-select-outer-boxShadow;
    overflow-y: auto;
    overflow-x: hidden;

    &:not(:first-child) {
      border-left: 0;
    }

    .#{$ns}NestedSelect-option {
      position: relative;
      padding-left: px2rem(10px);
      min-height: $Form-input-height;
      line-height: $Form-input-height;
      cursor: pointer;
      display: flex;

      > label {
        flex: 1;
        cursor: pointer;
      }

      &.is-active {
        color: $Form-select-menu-onActive-color;
        background-color: $Form-select-menu-onActive-bg;
      }

      &:hover {
        color: $Form-select-menu-onHover-color;
        background-color: $Form-select-menu-onHover-bg;
      }

      &:hover > .#{$ns}NestedSelect-childrenOuter {
        display: block;
      }

      .#{$ns}Checkbox {
        display: inline-block;
        padding-top: 0;
      }

      &.checkall {
        border-bottom: px2rem(1px) solid #eceff8;
      }
    }
  }
}

// 需要能撑开
@include media-breakpoint-up(sm) {
  .#{$ns}Form-control--sizeXs > .#{$ns}NestedSelect,
  .#{$ns}Form-control--sizeSm > .#{$ns}NestedSelect,
  .#{$ns}Form-control--sizeMd > .#{$ns}NestedSelect,
  .#{$ns}Form-control--sizeLg > .#{$ns}NestedSelect {
    display: inline-flex !important;
  }
}