ant-design/components/tree/style/mixin.less

@import '../../style/mixins/index';

@tree-prefix-cls: ~'@{ant-prefix}-tree';
@tree-node-prefix-cls: ~'@{tree-prefix-cls}-treenode';
@select-tree-prefix-cls: ~'@{ant-prefix}-select-tree';
@tree-motion: ~'@{ant-prefix}-motion-collapse';
@tree-node-padding: @padding-xs / 2;

.antTreeSwitcherIcon(@type: 'tree-default-open-icon') {
  .@{tree-prefix-cls}-switcher-icon,
  .@{select-tree-prefix-cls}-switcher-icon {
    display: inline-block;
    font-size: 10px;
    vertical-align: baseline;
    svg {
      transition: transform 0.3s;
    }
  }
}

.drop-indicator() {
  .@{tree-prefix-cls}-drop-indicator {
    position: absolute;
    // it should displayed over the following node
    z-index: 1;
    height: 2px;
    background-color: @primary-color;
    border-radius: 1px;
    pointer-events: none;
    &::after {
      position: absolute;
      top: -3px;
      left: -6px;
      width: 8px;
      height: 8px;
      background-color: transparent;
      border: 2px solid @primary-color;
      border-radius: 50%;
      content: '';
    }
  }
}

.antTreeShowLineIcon(@type) {
  .@{tree-prefix-cls}-switcher-icon,
  .@{tree-select-prefix-cls}-switcher-icon {
    display: inline-block;
    font-weight: normal;
    font-size: 12px;
    svg {
      transition: transform 0.3s;
    }
  }
}

.antTreeFn(@custom-tree-prefix-cls) {
  @custom-tree-node-prefix-cls: ~'@{custom-tree-prefix-cls}-treenode';
  .reset-component;
  background: @tree-bg;
  border-radius: @border-radius-base;
  transition: background-color 0.3s;

  &-focused:not(:hover):not(&-active-focused) {
    background: @primary-1;
  }

  // =================== Virtual List ===================
  &-list-holder-inner {
    align-items: flex-start;
  }

  &.@{custom-tree-prefix-cls}-block-node {
    .@{custom-tree-prefix-cls}-list-holder-inner {
      align-items: stretch;

      // >>> Title
      .@{custom-tree-prefix-cls}-node-content-wrapper {
        flex: auto;
      }
    }
  }

  // ===================== TreeNode =====================
  .@{custom-tree-node-prefix-cls} {
    display: flex;
    align-items: flex-start;
    padding: 0 0 @tree-node-padding 0;
    outline: none;
    // Disabled
    &-disabled {
      // >>> Title
      .@{custom-tree-prefix-cls}-node-content-wrapper {
        color: @disabled-color;
        cursor: not-allowed;

        &:hover {
          background: transparent;
        }
      }
    }

    &-active .@{custom-tree-prefix-cls}-node-content-wrapper {
      background: @tree-node-hover-bg;
    }
  }

  // >>> Indent
  &-indent {
    align-self: stretch;
    white-space: nowrap;
    user-select: none;

    &-unit {
      display: inline-block;
      width: @tree-title-height;
    }
  }

  // >>> Switcher
  &-switcher {
    .antTreeSwitcherIcon();
    position: relative;
    flex: none;
    align-self: stretch;
    width: @tree-title-height;
    margin: 0;
    line-height: @tree-title-height;
    text-align: center;
    cursor: pointer;
    user-select: none;

    &-noop {
      cursor: default;
    }

    &_close {
      .@{custom-tree-prefix-cls}-switcher-icon {
        svg {
          transform: rotate(-90deg);
        }
      }
    }

    &-loading-icon {
      color: @primary-color;
    }

    &-leaf-line {
      z-index: 1;
      display: inline-block;
      width: 100%;
      height: 100%;
      &::before {
        position: absolute;
        top: 0;
        bottom: -@tree-node-padding;
        margin-left: -1px;
        border-left: 1px solid @normal-color;
        content: ' ';
      }
      &::after {
        position: absolute;
        width: @tree-title-height - 14px;
        height: @tree-title-height - 10px;
        margin-left: -1px;
        border-bottom: 1px solid @normal-color;
        content: ' ';
      }
    }
  }

  // >>> Checkbox
  & &-checkbox {
    top: initial;
    margin: ((@tree-title-height - @checkbox-size) / 2) 8px 0 0;
  }

  // >>> Title
  & &-node-content-wrapper {
    position: relative;
    z-index: auto;
    min-height: @tree-title-height;
    margin: 0;
    padding: 0 4px;
    color: inherit;
    line-height: @tree-title-height;
    background: transparent;
    border-radius: @border-radius-base;
    cursor: pointer;
    transition: all 0.3s, border 0s, line-height 0s, box-shadow 0s;

    &:hover {
      background-color: @tree-node-hover-bg;
    }

    &.@{custom-tree-prefix-cls}-node-selected {
      background-color: @tree-node-selected-bg;
    }

    // Icon
    .@{custom-tree-prefix-cls}-iconEle {
      display: inline-block;
      width: @tree-title-height;
      height: @tree-title-height;
      line-height: @tree-title-height;
      text-align: center;
      vertical-align: top;
      &:empty {
        display: none;
      }
    }
  }

  // ==================== Draggable =====================
  &-node-content-wrapper[draggable='true'] {
    line-height: @tree-title-height;
    user-select: none;

    .drop-indicator();
  }

  .@{custom-tree-node-prefix-cls}.drop-container {
    > [draggable] {
      box-shadow: 0 0 0 2px @primary-color;
    }
  }

  // ==================== Show Line =====================
  &-show-line {
    // ================ Indent lines ================
    .@{custom-tree-prefix-cls}-indent {
      &-unit {
        position: relative;
        height: 100%;

        &::before {
          position: absolute;
          top: 0;
          right: @tree-title-height / 2;
          bottom: -@tree-node-padding;
          border-right: 1px solid @border-color-base;
          content: '';
        }

        &-end {
          &::before {
            display: none;
          }
        }
      }
    }

    // ============== Cover Background ==============
    .@{custom-tree-prefix-cls}-switcher {
      background: @component-background;

      &-line-icon {
        vertical-align: -0.225em;
      }
    }
  }
}

.@{tree-node-prefix-cls}-leaf-last {
  .@{tree-prefix-cls}-switcher {
    &-leaf-line {
      &::before {
        top: auto !important;
        bottom: auto !important;
        height: @tree-title-height - 10px !important;
      }
    }
  }
}