element-web-Github/res/css/structures/_LeftPanel.pcss

/*
Copyright 2024 New Vector Ltd.
Copyright 2020 The Matrix.org Foundation C.I.C.

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/

.mx_MatrixChat--with-avatar {
    .mx_LeftPanel,
    .mx_LeftPanel .mx_LeftPanel_roomListContainer {
        background-color: transparent;
    }
}

.mx_LeftPanel_outerWrapper {
    display: flex;
    flex-direction: column;
    max-width: 50%;
    position: relative;

    /* Contain the amount of layers rendered by constraining what actually needs re-layering via css */
    contain: layout paint;
}

.mx_LeftPanel_wrapper,
.mx_LeftPanel {
    --collapsedWidth: 68px;
}

.mx_LeftPanel_wrapper {
    display: flex;
    flex-direction: row;
    flex: 1;
    height: 100%; /* ensure space panel is still scrollable with an outer wrapper */

    .mx_LeftPanel_wrapper--user {
        background-color: $roomlist-bg-color;
        display: flex;
        overflow: hidden;
        position: relative;

        &[data-collapsed] {
            max-width: var(--collapsedWidth);
        }
    }
}

.mx_LeftPanel {
    background-color: $roomlist-bg-color;

    /* Create a row-based flexbox for the space panel and the room list */
    display: flex;
    contain: content;
    position: relative;
    flex-grow: 1;
    overflow: hidden;

    /* Note: The 'room list' in this context is actually everything that isn't the tag */
    /* panel, such as the menu options, breadcrumbs, filtering, etc */
    .mx_LeftPanel_roomListContainer {
        background-color: $roomlist-bg-color;
        flex: 1 0 0;
        min-width: 0;
        /* Create another flexbox (this time a column) for the room list components */
        display: flex;
        flex-direction: column;

        .mx_LeftPanel_userHeader {
            /* 12px top, 12px sides, 20px bottom (using 13px bottom to account
             * for internal whitespace in the breadcrumbs)
             */
            padding: 12px;
            flex-shrink: 0; /* to convince safari's layout engine the flexbox is fine */

            /* Create another flexbox column for the rows to stack within */
            display: flex;
            flex-direction: column;
        }

        .mx_LeftPanel_breadcrumbsContainer {
            overflow-y: hidden;
            overflow-x: scroll;
            margin: 12px 12px 0 12px;
            flex: 0 0 auto;
            /* Create yet another flexbox, this time within the row, to ensure items stay */
            /* aligned correctly. This is also a row-based flexbox. */
            display: flex;
            align-items: center;
            contain: content;

            &.mx_IndicatorScrollbar_leftOverflow {
                mask-image: linear-gradient(90deg, transparent, black 5%);
            }

            &.mx_IndicatorScrollbar_rightOverflow {
                mask-image: linear-gradient(90deg, black, black 95%, transparent);
            }

            &.mx_IndicatorScrollbar_rightOverflow.mx_IndicatorScrollbar_leftOverflow {
                mask-image: linear-gradient(90deg, transparent, black 5%, black 95%, transparent);
            }
        }

        .mx_LeftPanel_filterContainer {
            margin: 0 12px;
            padding: 12px 0 8px;
            border-bottom: 1px solid $quinary-content;

            flex-shrink: 0; /* to convince safari's layout engine the flexbox is fine */

            /* Create a flexbox to organize the inputs */
            display: flex;
            align-items: center;

            & + .mx_RoomListHeader {
                margin-top: 12px;
            }

            .mx_LeftPanel_dialPadButton {
                width: 32px;
                height: 32px;
                border-radius: 8px;
                background-color: $panel-actions;
                position: relative;
                margin-left: 8px;

                &::before {
                    content: "";
                    position: absolute;
                    top: 8px;
                    left: 8px;
                    width: 16px;
                    height: 16px;
                    mask-image: url("$(res)/img/element-icons/call/dialpad.svg");
                    mask-position: center;
                    mask-size: contain;
                    mask-repeat: no-repeat;
                    background-color: $secondary-content;
                }
            }

            .mx_LeftPanel_exploreButton,
            .mx_LeftPanel_recentsButton {
                width: 32px;
                height: 32px;
                border-radius: 8px;
                background-color: $panel-actions;
                position: relative;
                margin-left: 8px;

                &::before {
                    content: "";
                    position: absolute;
                    top: 8px;
                    left: 8px;
                    width: 16px;
                    height: 16px;
                    mask-position: center;
                    mask-size: contain;
                    mask-repeat: no-repeat;
                    background-color: $secondary-content;
                }

                &:hover {
                    background-color: $tertiary-content;

                    &::before {
                        background-color: $background;
                    }
                }
            }

            .mx_LeftPanel_exploreButton::before {
                mask-image: url("$(res)/img/element-icons/roomlist/explore.svg");
            }

            .mx_LeftPanel_recentsButton::before {
                mask-image: url("$(res)/img/element-icons/clock.svg");
            }
        }

        .mx_RoomListHeader:first-child {
            margin-top: 12px;
        }

        .mx_LeftPanel_roomListWrapper {
            /* Make the y-scrollbar more responsive */
            padding-right: 2px;
            overflow: hidden;
            margin-top: 10px; /* so we're not up against the search/filter */
            flex: 1 0 0; /* needed in Safari to properly set flex-basis */

            &.mx_LeftPanel_roomListWrapper_stickyBottom {
                padding-bottom: 32px;
            }

            &.mx_LeftPanel_roomListWrapper_stickyTop {
                padding-top: 32px;
            }
        }

        .mx_LeftPanel_actualRoomListContainer {
            position: relative; /* for sticky headers */
            height: 100%; /* ensure scrolling still works */
        }
    }

    /* These styles override the defaults for the minimized (66px) layout */
    &.mx_LeftPanel_minimized {
        flex-grow: 0;
        min-width: unset;
        width: unset !important;

        .mx_LeftPanel_roomListContainer {
            width: var(--collapsedWidth);

            .mx_LeftPanel_userHeader {
                flex-direction: row;
                justify-content: center;
            }

            .mx_LeftPanel_filterContainer {
                /* Organize the flexbox into a centered column layout */
                flex-direction: column;
                justify-content: center;

                .mx_LeftPanel_dialPadButton {
                    margin-left: 0;
                    margin-top: 8px;
                    background-color: transparent;
                }

                .mx_LeftPanel_exploreButton,
                .mx_LeftPanel_recentsButton {
                    margin-left: 0;
                    margin-top: 8px;
                }
            }
        }
    }
}