mediawiki-skins-Vector/resources/skins.vector.styles/components/StickyHeader.less

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@import '../../common/variables.less';
@import 'mediawiki.mixins.less';
// Set an explicit height. This is needed for scroll padding and for other
// sticky elements on the page. Setting the height in relative units enables
// the header's height to adapt to the browser's font size setting. Because
// this variable is used to determine top offsets for sticky elements where the
// font-size might not be 16px, using rem avoids the cascading effects of em units.
@height-sticky-header: unit( 60px / @font-size-browser, rem );
.vector-sticky-header {
width: 100%;
height: @height-sticky-header;
position: fixed;
top: 0;
left: 0;
right: 0;
z-index: @z-index-header;
transform: translateY( -100% );
transition: transform 250ms linear;
display: flex;
align-items: center;
max-width: @max-width-page-container + @padding-horizontal-page-container + @padding-horizontal-page-container;
margin: 0 auto;
background: @background-color-base;
background-color: #fffffff7;
border-bottom: 1px solid @colorGray14;
// FIXME: Should this adapt to different thresholds? Ask Alex!
padding: 6px 8px 6px 10px;
justify-content: space-between;
box-sizing: border-box;
// If the user has expressed their preference for reduced motion, then disable animation for the sticky header.
@media ( prefers-reduced-motion: reduce ) {
transition: none;
}
@media ( min-width: @width-breakpoint-desktop ) {
padding: 6px 25px;
}
// T289714 Hide the sticky header at lower resolutions.
@media ( max-width: @width-breakpoint-tablet ) {
display: none;
}
// Hide any open menus/search results unless sticky header is visible
&:not( .vector-sticky-header-visible ) > div {
display: none;
}
&-visible {
transform: translateY( 0% );
}
//
// Layout
//
&-start,
&-end,
&-icons,
&-context-bar {
display: flex;
align-items: center;
}
&-start {
flex-grow: 1;
}
//
// Components
//
&-context-bar {
border-left: 1px solid #c8c8c8;
margin: 0 15px;
padding-left: 30px;
white-space: nowrap;
}
&-context-bar-primary {
position: relative;
max-width: 500px;
overflow: hidden;
padding-right: 10px;
// T289814 Fade out page titles longer than 500px.
/* Stylelint rule broken for vendor prefixes: https://github.com/stylelint/stylelint/issues/1939 */
/* stylelint-disable function-linear-gradient-no-nonstandard-direction */
&:after {
content: '';
position: absolute;
left: 480px;
width: 100%;
height: 100%;
background-color: transparent;
background-image: -webkit-linear-gradient( to right, rgba( 255, 255, 255, 0 ), rgba( 255, 255, 255, 1 ) 20px );
background-image: linear-gradient( to right, rgba( 255, 255, 255, 0 ), rgba( 255, 255, 255, 1 ) 20px );
}
}
.vector-search-box {
// Hide the search box until the user toggles it.
display: none;
}
&.vector-header-search-toggled {
.vector-sticky-header-search-toggle,
.vector-sticky-header-context-bar {
display: none;
}
.vector-search-box {
display: block;
flex-basis: unit( 500px / @font-size-browser / @font-size-base, em );
}
// Increase the start margin of the search box to account for the input
// expanding on focus.
.vector-search-box-show-thumbnail {
margin-left: @size-search-expand;
}
}
}
.client-nojs .vector-sticky-header {
display: none;
}
@media ( min-width: @width-breakpoint-tablet ) {
.client-js.vector-sticky-header-enabled {
// T290518: When the sticky header is enabled (feature flag is on, js is
// enabled, and viewport is at higher resolutions), add scroll padding to the
// root element. This is needed so that the sticky header does not overlap the
// top of an element when the URI has a hash fragment (e.g. when the user clicks
// a jump link) and when the user tabs through elements in reverse order.
//
// Please note that this class must be independent of the
// .vector-sticky-header-visible class to correctly handle situations where the
// sticky header isn't visible yet but we still need scroll padding applied
// (e.g. when the user navigates to a page with a hash fragment in the URI).
scroll-padding-top: @height-sticky-header;
// T289817 Override other sticky element offsets to ensure that other
// sticky elements (i.e. table headers) appear below the sticky header.
.mw-sticky-header-element,
.charts-stickyhead th {
/* stylelint-disable-next-line declaration-no-important */
top: @height-sticky-header !important;
}
}
}