riot-web/res/css/views/rooms/_EventBubbleTile.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_RoomView_body[data-layout=bubble] {
    .mx_RoomView_timeline, .mx_RoomView_statusArea, .mx_MessageComposer {
        width: 100%;
        max-width: 1200px;
        margin: 0 auto;
    }
}

.mx_EventTile[data-layout=bubble],
.mx_GenericEventListSummary[data-layout=bubble] {
    --avatarSize: 32px;
    --gutterSize: 11px;
    --cornerRadius: 12px;
    --maxWidth: 70%;
    margin-right: 60px;
}

.mx_RoomView_searchResultsPanel {
    .mx_EventTile[data-layout=bubble] {
        .mx_SenderProfile {
            // Group layout adds a 64px left margin, which we really don't want on search results
            margin-left: 0;
        }

        &[data-self=true] {
            // The avatars end up overlapping, so just hide them
            .mx_EventTile_avatar {
                display: none;
            }
        }

        // Mirror rough designs for "greyed out" text
        &.mx_EventTile_contextual .mx_EventTile_line {
            opacity: 0.4;
        }
    }
}

.mx_EventTile[data-layout=bubble] {
    position: relative;
    margin-top: var(--gutterSize);
    margin-left: 49px;
    font-size: $font-14px;

    .mx_ThreadSummary {
        clear: both;
        width: fit-content;
    }

    .mx_EventTile_content {
        margin-right: 0;
    }

    &.mx_EventTile_continuation {
        margin-top: 2px;
    }

    &.mx_EventTile_highlight {
        &::before {
            background-color: $event-highlight-bg-color;
        }

        color: $alert;
    }

    /* For replies */
    .mx_EventTile {
        padding-top: 0;
    }

    &::before {
        content: '';
        position: absolute;
        top: -1px;
        bottom: -1px;
        left: -60px;
        right: -60px;
        z-index: -1;
        border-radius: 4px;
    }

    &:hover,
    &.mx_EventTile_selected {

        &::before {
            background: $eventbubble-bg-hover;
        }

        .mx_EventTile_avatar {
            img {
                box-shadow: 0 0 0 3px $eventbubble-bg-hover;
            }
        }
    }

    .mx_DisambiguatedProfile,
    .mx_EventTile_line {
        --EventBubbleTile_line-max-width: 70%;

        width: fit-content;
        max-width: var(--EventBubbleTile_line-max-width); // Align message bubble and displayName
        line-height: $font-18px; // fixed line height to prevent emoji from being taller than text
    }

    // other users profile on bubble layout
    > .mx_DisambiguatedProfile {
        white-space: normal; // display mxid

        .mx_DisambiguatedProfile_displayName {
            white-space: nowrap; // truncate long display names
            margin-inline-end: 5px;

            // For RTL displayName
            unicode-bidi: embed;
            direction: ltr;
        }

        .mx_DisambiguatedProfile_mxid {
            margin-inline-start: 0; // Align mxid with truncated displayName inside mx_EventTile[data-layout=bubble]
        }
    }

    // inside mx_RoomView_MessageList, outside of mx_ReplyTile
    // (on the main panel and the chat panel with a maximized widget)
    > .mx_DisambiguatedProfile,
    // inside a thread, outside of mx_ReplyTile
    .mx_EventTile_senderDetails > .mx_DisambiguatedProfile {
        position: relative;
        top: -2px;
        left: 2px;
        font-size: $font-15px;
    }

    .mx_MessageActionBar {
        top: -28px;
        z-index: 9; // above the avatar
    }

    .mx_MediaBody {
        // leave space for the timestamp
        padding-right: 48px;
    }

    .mx_MImageBody {
        .mx_MImageBody_thumbnail_container {
            justify-content: center;
            min-height: calc(1.8rem + var(--gutterSize) + var(--gutterSize));
            min-width: calc(1.8rem + var(--gutterSize) + var(--gutterSize));
        }
    }

    .mx_CallEvent {
        background-color: unset;

        border-style: solid;
        border-width: 1px;
        border-color: $quinary-content;
    }

    &[data-self=false] {
        .mx_EventTile_line {
            border-bottom-right-radius: var(--cornerRadius);

            .mx_MImageBody .mx_MImageBody_thumbnail_container,
            .mx_MImageBody::before,
            .mx_MVideoBody .mx_MVideoBody_container,
            .mx_MediaBody,
            .mx_MLocationBody_map,
            .mx_MBeaconBody {
                border-bottom-right-radius: var(--cornerRadius) !important;
            }
        }

        .mx_EventTile_avatar {
            left: -34px;
        }

        .mx_MessageActionBar {
            inset-inline-start: calc(100% - var(--MessageActionBar-size-box));
            right: initial; // Reset the default value
        }

        .mx_ThreadSummary {
            margin-inline-start: calc(-1 * var(--gutterSize));
            margin-inline-end: auto;
        }

        --backgroundColor: $eventbubble-others-bg;
    }

    &[data-self=true] {
        .mx_EventTile_line {
            margin-inline-start: auto;
            border-bottom-left-radius: var(--cornerRadius);

            .mx_MImageBody .mx_MImageBody_thumbnail_container,
            .mx_MImageBody::before,
            .mx_MVideoBody .mx_MVideoBody_container,
            .mx_MediaBody,
            .mx_MLocationBody_map,
            .mx_MBeaconBody {
                border-bottom-left-radius: var(--cornerRadius) !important;
            }
        }

        .mx_EventTile_sticker {
            // align timestamp with those inside bubbles
            margin-right: 32px;
        }

        .mx_ThreadSummary {
            margin-inline-start: auto;
            margin-inline-end: calc(-1 * var(--gutterSize));
        }

        .mx_DisambiguatedProfile {
            display: none;
        }

        .mx_ReplyTile .mx_DisambiguatedProfile {
            display: block;
        }

        .mx_ReactionsRow {
            float: right;
            clear: right;
            display: flex;

            /* Moving the "add reaction button" before the reactions */
            > :last-child {
                order: -1;
            }
        }

        .mx_EventTile_avatar {
            top: -19px; // height of the sender block
            right: -35px;
        }

        .mx_MediaBody {
            background: $eventbubble-self-bg;
        }

        .mx_MessageActionBar {
            inset-inline-end: 0;
        }

        --backgroundColor: $eventbubble-self-bg;
    }

    .mx_EventTile_line {
        --EventBubbleTile_line-margin-inline-end: -12px;

        position: relative;
        display: flex;
        gap: 5px;
        margin: 0 var(--EventBubbleTile_line-margin-inline-end) 0 -9px;
        border-top-left-radius: var(--cornerRadius);
        border-top-right-radius: var(--cornerRadius);

        // the selector here is quite weird because timestamps can appear linked & unlinked and in different places
        // in the DOM depending on the specific rendering context
        > a, // timestamp wrapper anchor
        .mx_MessageActionBar + .mx_MessageTimestamp {
            position: absolute;
            padding: 4px 8px;
            bottom: 0;
            right: 0;
            z-index: 3; // above media and location share maps
        }

        &.mx_EventTile_mediaLine {
            // TODO: Use a common class name instead
            .mx_MFileBody,
            .mx_MAudioBody {
                max-width: 100%; // avoid overflow
            }

            .mx_MVoiceMessageBody {
                // allow the event to be collapsed, this causes the waveform to get cropped
                min-width: 0;
            }

            // we put the timestamps for media (other than stickers) atop the media
            // for images we also apply a linear gradient and change the timestamp colour to aid readability
            &.mx_EventTile_image {
                .mx_MessageTimestamp {
                    color: #ffffff; // regardless of theme, always visible on the below gradient
                }

                // linear gradient to make the timestamp more visible
                .mx_MImageBody::before {
                    content: "";
                    position: absolute;
                    background: linear-gradient(180deg, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.2) 100%);
                    z-index: 1;
                    top: 0;
                    bottom: 0;
                    left: 0;
                    right: 0;
                    pointer-events: none;
                }
            }
        }

        &.mx_EventTile_sticker {
            > a, // timestamp wrapper anchor
            .mx_MessageActionBar + .mx_MessageTimestamp {
                // position timestamps for stickers to the right of the un-bubbled sticker
                right: unset;
                left: 100%;
            }

            .mx_MStickerBody_wrapper {
                padding: 0;
            }
        }

        .mx_MImageBody {
            width: 100%;
            height: 100%;

            .mx_MImageBody_thumbnail.mx_MImageBody_thumbnail--blurhash {
                position: unset;
            }
        }

        //noinspection CssReplaceWithShorthandSafely
        .mx_MImageBody .mx_MImageBody_thumbnail_container,
        .mx_MVideoBody .mx_MVideoBody_container,
        .mx_MediaBody {
            border-radius: unset;
            border-top-left-radius: var(--cornerRadius);
            border-top-right-radius: var(--cornerRadius);
        }

        .mx_EventTile_e2eIcon {
            flex-shrink: 0; // keep it at full size
        }
    }

    &:not(.mx_EventTile_noBubble) .mx_EventTile_line:not(.mx_EventTile_mediaLine) {
        // make the top and bottom padding 1px smaller so that we can pad .mx_EventTile_content by 1px
        // to avoid anti-zalgo cutting off our larger than text emojis.
        padding: calc(var(--gutterSize) - 1px);
        padding-right: 60px; // space for the timestamp
        background: var(--backgroundColor);

        .mx_EventTile_content {
            padding: 1px;
        }
    }

    &.mx_EventTile_continuation[data-self=false] .mx_EventTile_line {
        border-top-left-radius: 0;

        .mx_MImageBody .mx_MImageBody_thumbnail_container,
        .mx_MVideoBody .mx_MVideoBody_container,
        .mx_MImageBody::before,
        .mx_MediaBody,
        .mx_MLocationBody_map,
        .mx_MBeaconBody {
            border-top-left-radius: 0;
        }
    }
    &.mx_EventTile_lastInSection[data-self=false] .mx_EventTile_line {
        border-bottom-left-radius: var(--cornerRadius);

        .mx_MImageBody .mx_MImageBody_thumbnail_container,
        .mx_MVideoBody .mx_MVideoBody_container,
        .mx_MImageBody::before,
        .mx_MediaBody,
        .mx_MLocationBody_map,
        .mx_MBeaconBody {
            border-bottom-left-radius: var(--cornerRadius);
        }
    }

    &.mx_EventTile_continuation[data-self=true] .mx_EventTile_line {
        border-top-right-radius: 0;

        .mx_MImageBody .mx_MImageBody_thumbnail_container,
        .mx_MVideoBody .mx_MVideoBody_container,
        .mx_MImageBody::before,
        .mx_MediaBody,
        .mx_MLocationBody_map,
        .mx_MBeaconBody {
            border-top-right-radius: 0;
        }
    }
    &.mx_EventTile_lastInSection[data-self=true] .mx_EventTile_line {
        border-bottom-right-radius: var(--cornerRadius);

        .mx_MImageBody .mx_MImageBody_thumbnail_container,
        .mx_MVideoBody .mx_MVideoBody_container,
        .mx_MImageBody::before,
        .mx_MediaBody,
        .mx_MLocationBody_map,
        .mx_MBeaconBody {
            border-bottom-right-radius: var(--cornerRadius);
        }
    }

    .mx_EventTile_avatar {
        position: absolute;
        top: 0;
        line-height: 1;
        z-index: 9;
        img {
            box-shadow: 0 0 0 3px $background;
            border-radius: 50%;
        }
    }

    &.mx_EventTile_noSender {
        .mx_EventTile_avatar {
            top: -19px;
        }
    }

    .mx_BaseAvatar,
    .mx_EventTile_avatar {
        line-height: 1;
    }

    &[data-has-reply=true] {
        > .mx_EventTile_line {
            flex-direction: column;
        }

        .mx_ReplyChain_show {
            order: 99999;
        }

        .mx_ReplyChain {
            .mx_EventTile_reply {
                max-width: 90%;
                padding: 0;
                > a, // timestamp wrapper anchor
                .mx_MessageActionBar + .mx_MessageTimestamp {
                    display: none !important;
                }
            }

            .mx_EventTile {
                display: flex;
                gap: var(--gutterSize);
                .mx_EventTile_avatar {
                    position: static;
                }
                .mx_DisambiguatedProfile {
                    display: none;
                }
            }
        }
    }

    .mx_MPollBody {
        width: 550px; // to prevent timestamp overlapping summary text
        max-width: 100%; // prevent overflowing a reply tile

        .mx_MPollBody_totalVotes {
            // align summary text with corner timestamp
            padding: 4px 0;
        }
    }

    .mx_ReactionsRow {
        margin-right: -18px;
        margin-left: -9px;
    }

    &.mx_EventTile_bad {
        /* Special layout scenario for "Unable To Decrypt (UTD)" events */
        .mx_EventTile_line {
            display: grid;
            grid-template:
                "reply reply" auto
                "shield body" auto
                "shield link" auto
                / auto  1fr;

            .mx_UnknownBody,
            .mx_EventTile_keyRequestInfo,
            .mx_ReplyChain_wrapper,
            .mx_ViewSourceEvent {
                min-width: 0; // Prevent a grid blowout
            }

            .mx_EventTile_e2eIcon {
                grid-area: shield;
            }

            .mx_UnknownBody {
                grid-area: body;
            }

            .mx_EventTile_keyRequestInfo {
                grid-area: link;
            }

            .mx_ReplyChain_wrapper {
                grid-area: reply;
            }
        }

        &.mx_EventTile_info {
            // "Unable To Decrypt" layout for hidden events
            .mx_EventTile_line {
                gap: 0 9px; // 9px: margin value of E2E icon
                align-items: center;
                grid-template:
                    "shield source" auto
                    "shield link" auto
                    / auto  1fr;

                .mx_ViewSourceEvent {
                    grid-area: source;
                }
            }
        }
    }

    .mx_ReadReceiptGroup {
        position: absolute;

        // as close to right gutter without clipping as possible
        inset-inline-end: calc(-1 * var(--ReadReceiptGroup_EventBubbleTile-spacing-end));

        // (EventTileLine.line-height - ReadReceiptGroup.height) / 2
        // this centers the ReadReceiptGroup if we’ve got a single line
        bottom: calc(($font-18px - 24px) / 2);
        top: auto;
    }

    .mx_MTextBody {
        max-width: 100%;
    }

    .mx_CallEvent_wrapper {
        justify-content: center;
    }
}

.mx_EventTile.mx_EventTile_noBubble[data-layout=bubble] {
    --backgroundColor: transparent;

    .mx_EventTile_line.mx_EventTile_emote {
        padding-right: 60px; // align with bubbles text
        font-style: italic;

        > a { // timestamp anchor wrapper
            align-self: center;
            bottom: unset;
            top: unset;
            font-style: normal; // undo italic above
        }

        .mx_MEmoteBody {
            padding: 4px 0;
        }
    }
}

.mx_EventTile.mx_EventTile_bubbleContainer[data-layout=bubble],
.mx_EventTile.mx_EventTile_leftAlignedBubble[data-layout=bubble] {
    .mx_EventTile_line > a {
        // hide this timestamp as the tile will render its own
        display: none;
    }
}

.mx_EventTile.mx_EventTile_bubbleContainer[data-layout=bubble],
.mx_EventTile.mx_EventTile_leftAlignedBubble[data-layout=bubble],
.mx_EventTile.mx_EventTile_info[data-layout=bubble],
.mx_GenericEventListSummary[data-layout=bubble][data-expanded=false] {
    --backgroundColor: transparent;
    --gutterSize: 0;

    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 5px 0;

    .mx_EventTile_avatar {
        position: static;
        order: -1;
        margin-right: 5px;
    }

    .mx_EventTile_line,
    .mx_EventTile_info {
        min-width: 100%;
        // Preserve alignment with left edge of text in bubbles
        margin: 0;
    }

    .mx_EventTile_e2eIcon {
        margin-left: 9px;
    }

    .mx_EventTile_line {
        > a, // timestamp wrapper anchor
        .mx_MessageActionBar + .mx_MessageTimestamp {
            right: auto;
            left: -77px;
            bottom: unset;
            align-self: center;

            .mx_MessageTimestamp, &.mx_MessageTimestamp {
                vertical-align: middle;
            }
        }
    }
}

.mx_GenericEventListSummary[data-layout=bubble] {
    --maxWidth: 70%;
    margin-left: calc(var(--avatarSize) + var(--gutterSize));

    .mx_GenericEventListSummary_toggle {
        margin: 0 55px 0 5px;
        float: none;

        &[aria-expanded=false] {
            order: 9;
        }
        &[aria-expanded=true] {
            text-align: right;
        }
    }

    .mx_GenericEventListSummary_line {
        display: none;
    }

    .mx_GenericEventListSummary_avatars {
        padding-top: 0;
    }

    .mx_EventTile {
        &.mx_EventTile_info {
            .mx_EventTile_line {
                // Avoid overflow of event info by cancelling width settings
                width: 100%;
                min-width: 0;
                max-width: 100%;
            }
        }
    }

    &::after {
        content: "";
        clear: both;
    }

    &[data-expanded=false] {
        // Align with left edge of bubble tiles
        padding: 0 49px;

        // increase margin between ELS and the next Event to not have our user avatar overlap the expand/collapse button
        + .mx_EventTile[data-layout=bubble][data-self=true] {
            margin-top: 20px;
        }
    }

    // ideally we'd use display=contents here for the layout to all work regardless of the *ELS but
    // that breaks ScrollPanel's reliance upon offsetTop so we have to have a bit more finesse.
    &[data-expanded=true] {
        display: flex;
        flex-direction: column;
        margin: 0;

        .mx_EventTile_info {
            padding: 2px 0;
            margin-right: 0;

            .mx_MessageActionBar {
                inset-inline-start: initial; // Reset .mx_EventTile[data-layout="bubble"][data-self="false"] .mx_MessageActionBar
                inset-inline-end: 48px; // align with that of right-column bubbles
            }

            .mx_ReadReceiptGroup {
                // match alignment to RRs of chat bubbles
                inset-inline-end: calc(-1 * var(--ReadReceiptGroup_EventBubbleTile-spacing-end) + 60px);
            }

            &::before {
                inset-inline-end: 0; // match alignment of the hover background to that of chat bubbles
            }
        }
    }
}

/* events that do not require bubble layout */
.mx_GenericEventListSummary[data-layout=bubble],
.mx_EventTile.mx_EventTile_bad[data-layout=bubble] {
    .mx_EventTile_line {
        background: transparent;
    }

    &:hover {
        &::before {
            background: transparent;
        }
    }
}

.mx_EventTile_tileError[data-layout=bubble] .mx_EventTile_line {
    flex-direction: column; // restore the centering
}