riot-web/res/css/views/context_menus/_IconizedContextMenu.scss

/*
Copyright 2020 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.
*/

// A context menu that largely fits the | [icon]    [label] | format.
.mx_IconizedContextMenu {
    min-width: 146px;

    .mx_IconizedContextMenu_optionList {
        & > * {
            padding-left: 20px;
            padding-right: 20px;
        }

        // the notFirst class is for cases where the optionList might be under a header of sorts.
        &:nth-child(n + 2), .mx_IconizedContextMenu_optionList_notFirst {
            // This is a bit of a hack when we could just use a simple border-top property,
            // however we have a (kinda) good reason for doing it this way: we need opacity.
            // To get the right color, we need an opacity modifier which means we have to work
            // around the problem. PostCSS doesn't support the opacity() function, and if we
            // use something like postcss-functions we quickly run into an issue where the
            // function we would define gets passed a CSS variable for custom themes, which
            // can't be converted easily even when considering https://stackoverflow.com/a/41265350/7037379
            //
            // Therefore, we just hack in a line and border the thing ourselves
            &::before {
                border-top: 1px solid $primary-fg-color;
                opacity: 0.1;
                content: '';

                // Counteract the padding problems (width: 100% ignores the 40px padding,
                // unless we position it absolutely then it does the right thing).
                width: 100%;
                position: absolute;
                left: 0;
            }
        }

        // round the top corners of the top button for the hover effect to be bounded
        &:first-child .mx_AccessibleButton:first-child {
            border-radius: 8px 8px 0 0; // radius matches .mx_ContextualMenu
        }

        // round the bottom corners of the bottom button for the hover effect to be bounded
        &:last-child .mx_AccessibleButton:last-child {
            border-radius: 0 0 8px 8px; // radius matches .mx_ContextualMenu
        }

        .mx_AccessibleButton {
            // pad the inside of the button so that the hover background is padded too
            padding-top: 12px;
            padding-bottom: 12px;
            text-decoration: none;
            color: $primary-fg-color;
            font-size: $font-15px;
            line-height: $font-24px;

            // Create a flexbox to more easily define the list items
            display: flex;
            align-items: center;

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

            &.mx_AccessibleButton_disabled {
                opacity: 0.5;
                cursor: not-allowed;
            }

            img, .mx_IconizedContextMenu_icon { // icons
                width: 16px;
                min-width: 16px;
                max-width: 16px;
            }

            span.mx_IconizedContextMenu_label { // labels
                width: 100%;
                flex: 1;

                // Ellipsize any text overflow
                text-overflow: ellipsis;
                overflow: hidden;
                white-space: nowrap;
            }

            .mx_IconizedContextMenu_icon + .mx_IconizedContextMenu_label {
                padding-left: 14px;
            }
        }
    }

    .mx_IconizedContextMenu_icon {
        position: relative;
        width: 16px;
        height: 16px;

        &::before {
            content: '';
            width: 16px;
            height: 16px;
            position: absolute;
            mask-position: center;
            mask-size: contain;
            mask-repeat: no-repeat;
            background: $primary-fg-color;
        }
    }

    .mx_IconizedContextMenu_optionList_red {
        .mx_AccessibleButton {
            color: $warning-color !important;
        }

        .mx_IconizedContextMenu_icon::before {
            background-color: $warning-color;
        }
    }

    .mx_IconizedContextMenu_active {
        &.mx_AccessibleButton, .mx_AccessibleButton {
            color: $accent-color !important;
        }

        .mx_IconizedContextMenu_icon::before {
            background-color: $accent-color;
        }
    }

    &.mx_IconizedContextMenu_compact {
        .mx_IconizedContextMenu_optionList > * {
            padding: 8px 16px 8px 11px;
        }
    }

    .mx_IconizedContextMenu_checked {
        margin-left: 16px;
        margin-right: -5px;

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