element-web/res/css/views/right_panel/_ThreadPanel.scss

/*
Copyright 2021 The Matrix.org Foundation C.I.C.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

.mx_ThreadPanel {
    --ThreadPanel_header-button-size: 24px;

    display: flex;
    flex-direction: column;
    height: 100px;
    overflow: visible;

    .mx_BaseCard_header {
        margin-bottom: $spacing-12;

        .mx_BaseCard_close,
        .mx_BaseCard_back {
            width: var(--ThreadPanel_header-button-size);
            height: var(--ThreadPanel_header-button-size);
        }

        .mx_BaseCard_back {
            margin-inline-start: calc(var(--BaseCard_header_button-margin) - 4px);

            ~ .mx_ThreadPanel__header {
                width: calc(100% - 60px);
                margin-inline-start: var(--ThreadPanel_header-button-size);

                span {
                    margin-inline-start: 6px;
                }
            }
        }

        .mx_BaseCard_close {
            margin-inline-end: calc(var(--BaseCard_header_button-margin) - 4px);
        }

        .mx_ThreadPanel__header {
            width: calc(100% - 38px);
            height: 24px;
            display: flex;
            flex: 1;
            justify-content: space-between;
            align-items: center;

            span:first-of-type {
                font-weight: 600;
                font-size: 15px;
                line-height: 18px;
                color: $secondary-content;
            }

            .mx_AccessibleButton {
                font-size: 12px;
                color: $secondary-content;
            }

            .mx_MessageActionBar_optionsButton {
                position: relative;
            }

            .mx_MessageActionBar_maskButton {
                width: var(--ThreadPanel_header-button-size);
                height: var(--ThreadPanel_header-button-size);

                &::after {
                    mask-size: var(--ThreadPanel_header-button-size);
                    mask-image: url("$(res)/img/element-icons/message/overflow-large.svg");
                }
            }

            .mx_ThreadPanel_dropdown {
                padding: 3px $spacing-4 3px $spacing-8; // TODO: Use a spacing variable
                border-radius: 4px;
                line-height: 1.5;
                user-select: none;

                &:hover,
                &[aria-expanded=true] {
                    background: $quinary-content;
                }

                &::before {
                    content: "";
                    width: 18px;
                    height: 18px;
                    background: currentColor;
                    mask-image: url("$(res)/img/feather-customised/chevron-down.svg");
                    mask-size: 100%;
                    mask-repeat: no-repeat;
                    float: right;
                }
            }
        }
    }

    .mx_AutoHideScrollbar,
    .mx_RoomView_messagePanelSpinner {
        background-color: $background;
        border-radius: 8px;
        padding-inline-end: 0;
        overflow-y: scroll; // set gap between the thread tile and the right border
        height: 100%;
    }

    .mx_EventTile[data-layout=group] {
        .mx_MessageActionBar {
            right: 0;
            top: -36px; // 2px above EventTile
            z-index: 10; // See _EventTile.scss
        }
    }

    // For style rules of EventTile in a thread, see _EventTile.scss
    &.mx_ThreadView {
        max-height: 100%;

        .mx_ThreadView_timelinePanelWrapper {
            position: relative;
            min-height: 0; // don't displace the composer
            flex-grow: 1;

            .mx_FileDropTarget {
                border-radius: 8px;
            }
        }

        .mx_MessageComposer_sendMessage {
            margin-right: 0;
        }
    }

    .mx_RoomView_messagePanel { // To avoid the rule from being applied to .mx_ThreadPanel_empty
        .mx_RoomView_messageListWrapper {
            width: calc(100% + 6px); // 8px - 2px
        }
    }

    .mx_RoomView_MessageList {
        padding-inline-start: $spacing-8;
        padding-inline-end: $spacing-8;
        content-visibility: visible;
    }

    .mx_EventTile,
    .mx_GenericEventListSummary {
        // Account for scrollbar when hovering
        padding-top: 0;

        .mx_DateSeparator {
            display: none;
        }

        &.mx_EventTile_clamp:hover {
            cursor: pointer;
        }
    }

    .mx_MessageComposer {
        background-color: $background;
        border-radius: 8px;
        margin-top: 8px;
        padding: 0 8px;
        box-sizing: border-box;
    }

    .mx_MessageTimestamp {
        font-size: $font-12px;
        color: $secondary-content;
    }

    .mx_BaseCard_footer {
        text-align: left;
        font-size: $font-12px;
        align-items: center;
        justify-content: flex-end;
        gap: 4px;
        position: relative;
        top: 2px;
        padding-right: 8px;

        .mx_AccessibleButton_kind_link_inline {
            color: $secondary-content;
        }
    }
}

.mx_ThreadPanel_viewInRoom::before {
    mask-image: url('$(res)/img/element-icons/view-in-room.svg');
}

.mx_ThreadPanel_copyLinkToThread::before {
    mask-image: url('$(res)/img/element-icons/link.svg');
}

.mx_ThreadPanel_empty {
    border-radius: 8px;
    background: $background;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    padding: 20px;
    box-sizing: border-box; // Include padding and border
    width: 100%;

    h2 {
        color: $primary-content;
        font-weight: $font-semi-bold;
        font-size: $font-18px;
        margin-top: 24px;
        margin-bottom: 10px;
    }

    p {
        font-size: $font-15px;
        color: $secondary-content;
        margin: 10px 0;
    }

    button {
        border: none;
        background: none;
        color: $accent;
        font-size: $font-15px;

        &:hover,
        &:active {
            text-decoration: underline;
            cursor: pointer;
        }
    }

    .mx_ThreadPanel_empty_tip {
        font-size: $font-12px;
        line-height: $font-15px;

        >b {
            font-weight: $font-semi-bold;
        }
    }
}

.mx_ThreadPanel_largeIcon {
    width: 28px;
    height: 28px;
    padding: 18px;
    background: $system;
    border-radius: 50%;

    &::after {
        content: "";
        width: inherit;
        height: inherit;
        mask-image: url('$(res)/img/element-icons/thread-summary.svg');
        mask-position: center;
        display: inline-block;
        mask-repeat: no-repeat;
        mask-size: contain;
        background-color: $secondary-content;
    }
}

.mx_ContextualMenu_wrapper.mx_ThreadPanel__header {
    .mx_ContextualMenu {
        position: initial;

        span:first-of-type {
            font-weight: $font-semi-bold;
            font-size: inherit;
            color: $primary-content;
        }

        font-size: $font-12px;
        color: $secondary-content;
        padding-top: 10px;
        padding-bottom: 10px;

        border: 1px solid $quinary-content;
        box-shadow: 0px 1px 3px rgba(23, 25, 28, 0.05);
    }

    .mx_ContextualMenu_chevron_top {
        left: auto;
        right: 22px;
        border-bottom-color: $quinary-content;

        &::after {
            content: "";
            border: inherit;
            border-bottom-color: $menu-bg-color;
            position: absolute;
            top: 1px;
            left: -8px;
        }
    }

    .mx_ThreadPanel_Header_FilterOptionItem {
        display: flex;
        flex-grow: 1;
        justify-content: space-between;
        flex-direction: column;
        padding: 10px 20px 10px 30px;
        position: relative;

        &:hover {
            background-color: $event-selected-color;
        }

        &[aria-checked="true"] {
            :first-child {
                margin-left: -20px;
            }

            :first-child::before {
                content: "";
                width: 12px;
                height: 12px;
                margin-right: 8px;
                mask-image: url("$(res)/img/feather-customised/check.svg");
                mask-size: 100%;
                mask-repeat: no-repeat;
                background-color: $primary-content;
                display: inline-block;
                vertical-align: middle;
            }
        }

        :last-child {
            color: $secondary-content;
        }
    }
}