mirror of
https://github.com/element-hq/element-web
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c9dc273cb0
instead of having to offset the padding of children of the autohiding scrollbar container, which gets fiddly quickly, add a new child to the scrollbar container that gets a negative margin of the scrollbar width when needed (on hover and overflowing when overlay is not supported). This needs an extra DOM element, but as it doesn't do anything weird layout-wise (like set position), it shouldn't affect styling at all. It also makes the auto hide scrollbar workarounds completely transparent to the rest of the code.
54 lines
1.9 KiB
SCSS
54 lines
1.9 KiB
SCSS
/*
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Copyright 2018 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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1. for browsers that support native overlay auto-hiding scrollbars
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*/
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.mx_AutoHideScrollbar {
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overflow-x: hidden;
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overflow-y: auto;
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-ms-overflow-style: -ms-autohiding-scrollbar;
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}
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/*
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2. webkit also supports overflow:overlay where the scrollbars don't take any space
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in the layout but they don't autohide, so do that only on hover
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*/
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body.mx_scrollbar_overlay_noautohide .mx_AutoHideScrollbar {
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overflow-y: hidden;
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}
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body.mx_scrollbar_overlay_noautohide .mx_AutoHideScrollbar:hover {
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overflow-y: overlay;
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}
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/*
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3. as a last fallback, compensate for the scrollbar taking up space in the layout
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by having giving the child element (.mx_AutoHideScrollbar_offset) a
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negative right margin of the width of the scrollbar when the container
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is overflowing. This is what Firefox ends up using. Overflow is detected
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in javascript, and adds the mx_AutoHideScrollbar_overflow class to the container.
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This only works in Firefox, which should be fine as this fallback is only needed there.
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*/
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body.mx_scrollbar_nooverlay .mx_AutoHideScrollbar {
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overflow-y: hidden;
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}
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body.mx_scrollbar_nooverlay .mx_AutoHideScrollbar:hover {
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overflow-y: auto;
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}
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body.mx_scrollbar_nooverlay .mx_AutoHideScrollbar:hover.mx_AutoHideScrollbar_overflow > .mx_AutoHideScrollbar_offset {
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margin-right: calc(-1 * var(--scrollbar-width));
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}
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