perspective-viewer 5.0.0

A data visualization and analytics component, especially well-suited for large and/or streaming datasets.
Documentation 
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/* ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
 * ┃ ██████ ██████ ██████       █      █      █      █      █ █▄  ▀███ █       ┃
 * ┃ ▄▄▄▄▄█ █▄▄▄▄▄ ▄▄▄▄▄█  ▀▀▀▀▀█▀▀▀▀▀ █ ▀▀▀▀▀█ ████████▌▐███ ███▄  ▀█ █ ▀▀▀▀▀ ┃
 * ┃ █▀▀▀▀▀ █▀▀▀▀▀ █▀██▀▀ ▄▄▄▄▄ █ ▄▄▄▄▄█ ▄▄▄▄▄█ ████████▌▐███ █████▄   █ ▄▄▄▄▄ ┃
 * ┃ █      ██████ █  ▀█▄       █ ██████      █      ███▌▐███ ███████▄ █       ┃
 * ┣━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┫
 * ┃ Copyright (c) 2017, the Perspective Authors.                              ┃
 * ┃ ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ ┃
 * ┃ This file is part of the Perspective library, distributed under the terms ┃
 * ┃ of the [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0). ┃
 * ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
 */

/* Panel context menu (right-click a panel). The `<perspective-context-menu>`
 * host is body-mounted by `PortalModal` (which owns position/z-index inline)
 * and themed by the document theme rules' modal selector groups — chrome like
 * `background-color`/`color`/`border` lands on the HOST from `defaults.css` /
 * each theme's `perspective-context-menu[theme="X"]` group, exactly like the
 * Copy/Export menus. Only the interior layout + item states live here. */

:host {
    outline: none;
    user-select: none;
    font-size: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.context-menu {
    display: flex;
    flex-direction: column;
    min-width: 120px;
    padding: 4px 0;
}

.context-menu-item {
    position: relative;
    padding: 4px 12px;
    cursor: pointer;
    white-space: nowrap;

    &:hover {
        background: var(
            --psp-context-menu--hover--background,
            var(--psp-active--background, rgba(0, 0, 0, 0.08))
        );
        color: var(--psp-context-menu--hover--color, inherit);
    }

    &.disabled {
        opacity: 0.4;
        cursor: default;

        &:hover {
            background: transparent;
            color: inherit;
        }
    }

    &.has-submenu {
        display: flex;
        align-items: center;

        &::after {
            content: "▸";
            margin-left: auto;
            padding-left: 12px;
        }

        &:hover > .context-menu-submenu {
            display: flex;
        }
    }
}

/* Hover flyout. Positioned OUTSIDE the host's box, so the host-level theme
 * chrome (see the :host comment above) doesn't paint it — rebuild the same
 * chrome from the modal selector groups' vars. Edge-adjacent (`left: 100%`,
 * no gap) so the pointer never leaves the hover chain crossing into it;
 * `top: -5px` aligns its first row with the parent row (4px menu padding +
 * 1px border). */
.context-menu-submenu {
    display: none;
    position: absolute;
    left: 100%;
    top: -5px;
    max-height: 50vh;
    overflow-y: auto;
    background-color: var(--psp--background-color, white);
    border: 1px solid var(--psp-inactive--color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

/* Non-interactive group label (e.g. client names in the "New" sub-menu). */
.context-menu-header {
    padding: 4px 12px 2px;
    cursor: default;
    white-space: nowrap;
    font-size: 9px;
    text-transform: uppercase;
    color: var(--psp-inactive--color, #ababab);
}