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

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

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

    &.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_SenderProfile,
    .mx_EventTile_line {
        width: fit-content;
        max-width: 70%;
    }

    > .mx_SenderProfile {
        position: relative;
        top: -2px;
        left: 2px;
        font-size: $font-15px;
    }

    .mx_MessageActionBar {
        top: -28px;
        right: 0;
        z-index: 9; // above the avatar
    }

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

    .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,
            .mx_MImageBody::before,
            .mx_MLocationBody_map {
                border-bottom-right-radius: var(--cornerRadius);
            }
        }

        .mx_EventTile_avatar {
            left: -34px;
        }

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

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

            .mx_MImageBody .mx_MImageBody_thumbnail,
            .mx_MImageBody::before,
            .mx_MLocationBody_map {
                border-bottom-left-radius: var(--cornerRadius);
            }
        }

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

        .mx_ThreadInfo {
            float: right;
            margin-right: calc(-1 * var(--gutterSize));
        }

        .mx_SenderProfile {
            display: none;
        }

        .mx_ReplyTile .mx_SenderProfile {
            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;
        }

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

    .mx_EventTile_line {
        position: relative;
        display: flex;
        gap: 5px;
        margin: 0 -12px 0 -9px;
        border-top-left-radius: var(--cornerRadius);
        border-top-right-radius: var(--cornerRadius);

        > a { // timestamp wrapper anchor
            position: absolute;
            padding: 4px 8px;
            bottom: 0;
            right: 0;
            z-index: 3; // above media and location share maps
        }

        // we put the timestamps for media (other than stickers) atop the media along with a gradient to aid visibility
        &.mx_EventTile_mediaLine:not(.mx_EventTile_sticker) {
            .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 {
                // position timestamps for stickers to the right of the un-bubbled sticker
                right: unset;
                left: 100%;
            }

            .mx_MStickerBody_wrapper {
                padding: 0;
            }
        }

        //noinspection CssReplaceWithShorthandSafely
        .mx_MImageBody {
            width: 100%;
            height: 100%;

            //noinspection CssReplaceWithShorthandSafely
            .mx_MImageBody_thumbnail {
                // Note: This is intentionally not compressed because the browser gets confused
                // when it is all combined. We're effectively unsetting the border radius then
                // setting the two corners we care about manually.
                border-radius: unset;
                border-top-left-radius: var(--cornerRadius);
                border-top-right-radius: var(--cornerRadius);

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

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

    &:not(.mx_EventTile_noBubble) .mx_EventTile_line:not(.mx_EventTile_mediaLine) {
        padding: var(--gutterSize);
        padding-right: 60px; // space for the timestamp
        background: var(--backgroundColor);
    }

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

        .mx_MImageBody .mx_MImageBody_thumbnail,
        .mx_MImageBody::before,
        .mx_MLocationBody_map {
            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,
        .mx_MImageBody::before,
        .mx_MLocationBody_map {
            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,
        .mx_MImageBody::before,
        .mx_MLocationBody_map {
            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,
        .mx_MImageBody::before,
        .mx_MLocationBody_map {
            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 {
                    display: none !important;
                }
            }

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

    .mx_EditMessageComposer_buttons {
        position: static;
        padding: 0;
        margin: 8px 0 0;
        background: transparent;
    }

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

    /* Special layout scenario for "Unable To Decrypt (UTD)" events */
    &.mx_EventTile_bad > .mx_EventTile_line {
        display: grid;
        grid-template:
            "reply reply" auto
            "shield body" auto
            "shield link" auto
            / auto  1fr;
        .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_readAvatars {
        position: absolute;
        right: -78px; // as close to right gutter without clipping as possible
        bottom: 0;
        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.mx_EventTile_bubbleContainer[data-layout=bubble],
.mx_EventTile.mx_EventTile_leftAlignedBubble[data-layout=bubble],
.mx_EventTile.mx_EventTile_info[data-layout=bubble],
.mx_EventListSummary[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
        right: auto;
        left: -77px;
        bottom: unset;
        align-self: center;

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

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

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

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

    .mx_EventListSummary_line {
        display: none;
    }

    .mx_EventListSummary_avatars {
        padding-top: 0;
    }

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

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

// 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.
.mx_EventListSummary[data-expanded=true][data-layout=bubble] {
    margin: 0;

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

        .mx_MessageActionBar {
            right: 127px; // align with that of right-column bubbles
        }

        .mx_EventTile_readAvatars {
            right: -18px; // match alignment to RRs of chat bubbles
        }

        &::before {
            right: 0; // match alignment of the hover background to that of chat bubbles
        }
    }
}

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

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

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