waveterm/frontend/app/tab/tab.scss

// Copyright 2024, Command Line Inc.
// SPDX-License-Identifier: Apache-2.0

.tab {
    position: absolute;
    width: 130px;
    height: calc(100% - 1px);
    padding: 0 0 0 0;
    box-sizing: border-box;
    font-weight: bold;
    color: var(--secondary-text-color);
    opacity: 0;
    display: flex;
    align-items: center;
    justify-content: center;

    &::after {
        content: "";
        position: absolute;
        left: 0;
        width: 1px;
        height: 14px;
        border-right: 1px solid rgb(from var(--main-text-color) r g b / 0.2);
    }

    .tab-inner {
        position: relative;
        width: calc(100% - 6px);
        height: 100%;
        white-space: nowrap;
        border-radius: 6px;
    }

    &.animate {
        transition:
            transform 0.3s ease,
            background-color 0.3s ease-in-out;
    }

    &.active {
        .tab-inner {
            border-color: transparent;
            border-radius: 6px;
            background: rgb(from var(--main-text-color) r g b / 0.1);
        }

        .name {
            color: var(--main-text-color);
        }

        & + .tab::after,
        &::after {
            content: none;
        }
    }

    &:first-child::after {
        content: none;
    }

    .name {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate3d(-50%, -50%, 0);
        user-select: none;
        z-index: var(--zindex-tab-name);
        font-size: 11px;
        font-weight: 500;
        text-shadow: 0px 0px 4px rgb(from var(--main-bg-color) r g b / 0.25);
        overflow: hidden;
        width: calc(100% - 10px);
        text-overflow: ellipsis;
        text-align: center;

        &.focused {
            outline: none;
            border: 1px solid rgb(from var(--main-text-color) r g b / 0.179);
            padding: 2px 6px;
            border-radius: 2px;
        }
    }

    .button {
        position: absolute;
        top: 50%;
        right: 4px;
        transform: translate3d(0, -50%, 0);
        width: 20px;
        height: 20px;
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        z-index: var(--zindex-tab-name);
        padding: 1px 2px;
        transition: none !important;
    }

    .close {
        visibility: hidden;
    }
}

// Only apply hover effects when not in nohover mode. This prevents the previously-hovered tab from remaining hovered while a tab view is not mounted.
body:not(.nohover) .tab:hover,
body:not(.nohover) .tab.dragging {
    & + .tab::after,
    &::after {
        content: none;
    }

    .tab-inner {
        border-color: transparent;
        background: rgb(from var(--main-text-color) r g b / 0.1);
    }
    .close {
        visibility: visible;
        &:hover {
            color: var(--main-text-color);
        }
    }
}

// When in nohover mode, always show the close button on the active tab. This prevents the close button of the active tab from flickering when nohover is toggled.
body.nohover .tab.active .close {
    visibility: visible;
}

@keyframes expandWidthAndFadeIn {
    from {
        width: var(--initial-tab-width);
        opacity: 0;
    }
    to {
        width: var(--final-tab-width);
        opacity: 1;
    }
}

.tab.new-tab {
    animation: expandWidthAndFadeIn 0.1s forwards;
}