amis/scss/components/form/_combo.scss

.#{$ns}Combo {

    &-toolbarBtn {
        line-height: $Combo-toolbarBtn-lineHeight;
        height: $Combo-toolbarBtn-height;
        color: $Combo-toolbarBtn-color;
        padding: $Combo-toolbarBtn-paddingY $Combo-toolbarBtn-paddingX;
        cursor: pointer;

        &:hover {
            color: darken($Combo-toolbarBtn-color, 10%);
        }
    }

    &-addBtn {
        font-size: $Combo-addBtn-fontSize;
        
        @include button-size($Combo-addBtn-paddingY, $Combo-addBtn-paddingX, $Combo-addBtn-fontSize, $Combo-addBtn-lineHeight, $Combo-addBtn-borderRadius, $Combo-addBtn-height);
        
        @include button-variant(
            $Combo-addBtn-bg,
            $Combo-addBtn-border,
            $Combo-addBtn-color,
            $Combo-addBtn-onHover-bg,
            $Combo-addBtn-onHover-border,
            $Combo-addBtn-onHover-color,
            $Combo-addBtn-onActive-bg,
            $Combo-addBtn-onActive-border,
            $Combo-addBtn-onActive-color
        );

        &.is-disabled {
            pointer-events: none;
            opacity: $Button-onDisabled-opacity;
        }
    }

    &-items {
        &:empty {
            display: none;

            + .#{$ns}Combo-toolbar {
                padding-top: ($Form-input-height - $Combo-addBtn-height) / 2;
            }
        }

        margin-bottom: $Combo-items-marginBottom;
    }

    &--hor {
        .#{$ns}Combo-item {
            display: flex;
            flex-wrap: nowrap;
        }

        .#{$ns}Combo-item + .#{$ns}Combo-item {
            margin-top: $Combo--horizontal-item-gap;
        }

        .#{$ns}Combo-itemInner {
            flex-basis: 0;
            flex-grow: 1;
        }

        .#{$ns}Combo-itemToolbar {
            margin-left: $gap-xs;
            display: flex;
            white-space: nowrap;
            align-items: flex-start;
            padding-top: $Form-label-paddingTop;

            > .is-disabled {
                pointer-events: none;
                opacity: $Button-onDisabled-opacity;
            }
        }
    }

    &--ver:not(&--noBorder) {
        > .#{$ns}Combo-items {
            margin: (-$Combo--vertical-item-gap*2) (-$Combo--vertical-item-gap*2) 0 (-$Combo--vertical-item-gap*2);
        }

        // 不严格点会命中 combo 里面嵌套 combo 的情况，so sad.
        > .#{$ns}Combo-item,
        > .#{$ns}Combo-items > .#{$ns}Combo-item {
            border: $Combo--vertical-item-borderWidth dashed $Combo--vertical-item-borderColor;
            padding: $Combo--vertical-item-paddingY $Combo--vertical-item-paddingX;
            position: relative;
        }

        > .#{$ns}Combo-items > .#{$ns}Combo-item {
            margin: $Combo--vertical-item-gap * 2;
        }

        > .#{$ns}Combo-item > .#{$ns}Combo-itemToolbar,
        > .#{$ns}Combo-items > .#{$ns}Combo-item > .#{$ns}Combo-itemToolbar {
            opacity: 0;
            position: absolute;
            right: $Combo--vertical-itemToolbar-positionRight;
            top: $Combo--vertical-itemToolbar-positionTop / 2;
            transition: $Combo--vertical-itemToolbar-transion;
            height: $Combo--vertical-itemToolbar-height;
            line-height: $Combo--vertical-itemToolbar-height;
            background-color: $Combo--vertical-itemToolbar-bg;
            color: $Combo--vertical-itemToolbar-color;
            border-top-left-radius: $Combo--vertical-itemToolbar-borderRadius;
            border-top-right-radius: $Combo--vertical-itemToolbar-borderRadius;
            padding: 0 px2rem(3px);
            border-style: solid;
            border-color: $Combo--vertical-itemToolbar-borderColor;
            border-width: $Combo--vertical-itemToolbar-borderWidth $Combo--vertical-itemToolbar-borderWidth 0 $Combo--vertical-itemToolbar-borderWidth;
            // margin-top: px2rem(-1px);

            .#{$ns}Combo-toolbarBtn {
                color: inherit;
                line-height: $Combo--vertical-itemToolbar-height;
                // font-size: px2rem(14px);

                &:hover {
                    color: $Combo--vertical-itemToolbar-onHover-color;
                }
            }

            // top: $Combo--vertical-itemToolbar-positionTop;
            // opacity: 1;
        }

        > .#{$ns}Combo-item:hover,
        > .#{$ns}Combo-items > .#{$ns}Combo-item:hover {
            border-color: $Combo--vertical-item-onHover-borderColor;
            // border-style: solid;

            > .#{$ns}Combo-itemToolbar {
                top: $Combo--vertical-itemToolbar-positionTop;
                opacity: 1;
                
            }
        }
    }

    &-item--dragging {
        position: relative;
        &:after {
            content: '';
            display: block;
            position: absolute;
            z-index: 5;
            left: 0;
            top: 0;
            right: 0;
            bottom: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.1);
        }
    }
}

.#{$ns}Combo-dragableTip {
    color: $text--muted-color;
    font-size: $fontSizeSm;
    margin-left: $gap-xs;
}

.#{$ns}ComboControl.is-inline {
    .#{$ns}Combo--hor .#{$ns}Combo-itemInner {
        flex-grow: unset;
        flex-basis: unset;
    }

    .#{$ns}Combo--ver .#{$ns}Combo-item {
        display: inline-block;
    }
}


@include media-breakpoint-up(sm) {
    .#{$ns}Combo-form .#{$ns}Form-item:last-child {
        margin-bottom: 0;
    }
}