amis/scss/components/form/_tree.scss

@mixin tree-input {
    > svg {
        display: inline-block;
        cursor: pointer;
        position: relative;
        top: 2px;
        width: px2rem(16px);
        height: px2rem(16px);
        margin-left: px2rem(5px);
    }

    > input {
        margin-left: px2rem(15px);
        padding: px2rem(5px);
        width: px2rem(150px);
        height: px2rem(25px);
        color: $Form-input-color;

        &::placeholder {
            color: $Form-input-placeholderColor;
            user-select: none;
        }

        &:focus {
            outline: none;
            border: $borderWidth solid $info;
        }
    }
}

// todo
.#{$ns}TreeControl {
    border: 1px solid $Form-input-borderColor;
    padding: 6px 12px;
    border-radius: 2px;
    max-height: 300px;
    overflow: auto;

    &.h-full {
        max-height: none;
    }

    &.no-border {
        border: 0;
    }
}

.#{$ns}Tree {
    &-list,
    &-sublist {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    &-sublist {
        padding-left: $Tree-indent;

        &.is-folded {
            display: none;
        }

        > li {
            @include tree-input;
        }
    }

    &-item {
        line-height: px2rem(30px);
        position: relative;

        .#{$ns}Tree-item-icons {
            visibility: hidden;
            transition: visibility .1s ease;
        }

        > a {
            color: inherit;

            &:hover {
                text-decoration: none;

                > span.#{$ns}Tree-item-icons {
                    visibility: visible;
                }
            }

            > span > svg {
                display: inline-block;
                cursor: pointer;
                position: relative;
                top: 2px;
                width: px2rem(16px);
                height: px2rem(16px);
                margin-left: px2rem(5px);
            }
        }

        &--isLeaf > a {
            padding-left: $Tree-itemArrowWidth + $gap-xs;
        }

        &--isEdit {
            display: inline-block;
            @include tree-input;
        }
    }

    &-rootItem {
        > a > i {
            margin-left: 0 !important;
        }

        .#{$ns}Tree-addTop {
            height: px2rem(25px);
            line-height: px2rem(25px);
            cursor: pointer;
            padding-left: $Tree-indent;
            > p {
                > svg {
                    position: relative;
                    top: 2px;
                    width: px2rem(16px);
                    height: px2rem(16px);
                }
                > span {
                    padding-left: px2rem(5px);
                }
            }

            &-input {
                @include tree-input
            }
        }
    }

    &-itemArrow {
        cursor: pointer;
        width: $Tree-itemArrowWidth;
        margin-right: $gap-xs;
        display: inline-block;

        &:before {
            font-style: normal;
            font-family: $Tree-arrowVendor;
            content: $Tree-unfoldedArrowContent;
        }

        &.is-folded:before {
            content: $Tree-foldedArrowContent;
        }
    }

    &-itemIcon {
        display: inline-block;
        margin-right: $gap-xs;
    }

    &-rootIcon {
        &:before {
            font-style: normal;
            font-family: $Tree-rootIconVendor;
            content: $Tree-rootIconContent;
        }
    }

    &-leafIcon {
        &:before {
            font-style: normal;
            font-family: $Tree-leafIconVendor;
            content: $Tree-leafIconContent;
        }
    }

    &-folderIcon {
        &:before {
            font-style: normal;
            font-family: $Tree-folderIconVendor;
            content: $Tree-folderIconContent;
        }
    }

    &-itemText {
        user-select: none;
        cursor: pointer;

        &.is-checked,
        &.is-children-checked {
            color: $Tree-itemText--onChecked-color;
        }

        &.is-disabled {
            color: $text--muted-color;
        }
    }

    &-placeholder {
        color: $text--muted-color;
    }
}