amis/scss/components/form/_select.scss

.#{$ns}Select {
  display: inline-flex;
  vertical-align: middle;
  text-align: left;
  outline: none;
  position: relative;
  border: $Form-select-borderWidth solid $Form-select-borderColor;
  background: $Form-select-bg;
  border-radius: $Form-select-borderRadius;
  min-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;

  &:hover {
    background: $Form-select-onHover-bg;
    border-color: $Form-select-onHover-borderColor;

    .#{$ns}Select-arrow:before {
      color: $Form-select-caret-onHover-iconColor;
    }
  }

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

  &-valueWrap {
    user-select: none;
    position: relative;
    flex-grow: 1;
    line-height: 1;
    // width: 0;
    max-width: 100%;
  }

  &-placeholder {
    color: $Form-select-placeholderColor;
    line-height: $Form-input-lineHeight;
    user-select: none;
    white-space: nowrap;
  }

  &-value {
    line-height: $Form-input-lineHeight * $Form-input-fontSize;
    // white-space: nowrap;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  &--multi {
    height: auto;
    min-height: $Form-selectOption-height;

    .#{$ns}Select-valueWrap {
      margin-bottom: -$gap-xs;

      > input {
        display: inline-block;
        width: px2rem(100px);
        margin-bottom: $gap-xs;
      }
    }

    .#{$ns}Select-values + .#{$ns}Select-input {
      transform: translateY(0);
    }

    .#{$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;
    }
  }

  &-valueIcon {
    cursor: pointer;
    border-right: px2rem(1px) solid $Form-selectValue-borderColor;
    padding: 1px 5px;

    &:hover {
      background-color: darken($Form-selectValue-bg, 5%);
    }

    &.is-disabled {
      pointer-events: none;
      display: none;
      cursor: not-allowed;
      background-color: lighten($Form-selectValue-bg, 5%);
      background: lighten($Form-selectValue-bg, 5%);
    }
  }

  &-arrow {
    margin-right: $gap-xs;
    // margin-left: $gap-xs;
    width: px2rem(20px);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;

    > svg {
      transition: transform 0.3s;
      display: inline-block;
      color: $Form-select-caret-iconColor;
      width: 10px;
      height: 10px;
    }
  }

  &.is-opened &-arrow > svg {
    transform: rotate(180deg);
  }

  &-menu {
    max-height: px2rem(300px);
    overflow: auto;
    user-select: none;
  }

  &-input {
    cursor: pointer;
    outline: none;
    border: none;
    margin: 0 $Form-select-paddingX;
    height: $Form-select-search-height;
    font-size: $Form-select-input-fontSize;
    border-bottom: 1px solid $borderColor;
    display: flex;
    align-items: center;

    // &.is-focused {
    //   border-color: $Form-input-onFocused-borderColor;
    // }

    > svg {
      fill: #999;
      width: px2rem(14px);
      min-width: px2rem(14px);
      height: px2rem(14px);
      margin-right: px2rem(5px);
    }

    > input {
      outline: none;
      border: none;
      flex-grow: 1;
      background: transparent;
      position: relative;
      top: 0.125em;
    }
  }

  &-option {
    cursor: pointer;
    min-width: px2rem(120px);
    padding: (
        $Form-select-menu-height - $Form-input-lineHeight * $Form-input-fontSize
      )/2 $Form-select-paddingX;

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

    &.is-highlight {
      color: $Form-select-menu-onHover-color;
      background-color: $Form-select-menu-onHover-bg;
    }

    &.is-disabled {
      color: $Form-select-menu-onDisabled-color;
      background-color: $Form-select-menu-onDisabled-bg;
    }

    &--placeholder {
      color: $Form-input-placeholderColor;
    }

    > label {
      display: block;
    }

    > a {
      float: right;
      margin-left: px2rem(5px);
      display: none;
    }

    &.is-highlight > a {
      display: block;
    }
  }

  &-noResult {
    color: $Form-select-placeholderColor;
    line-height: $Form-input-lineHeight;
    font-size: $Form-select-input-fontSize;
    user-select: none;
    padding: (
        $Form-select-menu-height - $Form-input-lineHeight * $Form-input-fontSize
      )/2 $Form-select-paddingX;
  }

  &-option-hl {
    color: $red;
  }

  &-addBtn {
    display: block;
    cursor: pointer;
    padding: (
        $Form-select-menu-height - $Form-input-lineHeight * $Form-input-fontSize
      )/2 $Form-select-paddingX;

    &:hover {
      text-decoration: none;
    }

    > svg {
      width: px2rem(14px);
      height: px2rem(14px);
      margin-right: $Checkbox-gap;
    }
  }

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

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

  &-spinner {
    line-height: $Form-input-lineHeight * $Form-input-fontSize;
  }

  &-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%);
    }
  }
}

.#{$ns}Select-popover {
  margin-top: $Form-select-popoverGap - $Form-select-outer-borderWidth;

  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;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  min-width: px2rem(100px);
  z-index: 10;

  &.#{$ns}PopOver--leftTopLeftBottom {
    margin-top: -($Form-select-popoverGap - $Form-select-outer-borderWidth);
  }
}

.#{$ns}SelectControl:not(.is-inline) > .#{$ns}Select {
  display: flex;
}

// 需要能撑开
@include media-breakpoint-up(sm) {
  .#{$ns}Form-control--sizeXs > .#{$ns}Select,
  .#{$ns}Form-control--sizeSm > .#{$ns}Select,
  .#{$ns}Form-control--sizeMd > .#{$ns}Select,
  .#{$ns}Form-control--sizeLg > .#{$ns}Select {
    min-width: 100%;
    max-width: 100%;
    display: inline-flex !important;

    .#{$ns}Select-valueWrap {
      width: 0; // ! 没有这个会撑开。
    }
  }
}