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

/**
 * Loading indicator for search widget
 *
 * By adding a class on the parent search form
 * <div id="simpleSearch" class="search-form__loader"></div>
 * A pseudo element is added via ':after' that mimics the appearance
 * of the search suggestion and contains the text
 * "Loading search suggestions" (message key: vector-search-loader).
 *
 * After appearing for more than a second, a progress-bar animation appears
 * above the loading indicator.
 *
 **/

@import '../../common/variables.less';

// Derived from @size-search-figure in WVUI.
// https://gerrit.wikimedia.org/r/plugins/gitiles/wvui/+/e32b54f3b8d1118b6a25cdc46b5638d6d048533e/src/themes/wikimedia-ui.less#21
@size-search-figure: unit( 36px / @font-size-browser / @font-size-base, em );
// Derived from @padding-vertical-typeahead-suggestion: 8px in WVUI.
// https://gerrit.wikimedia.org/r/plugins/gitiles/wvui/+/e32b54f3b8d1118b6a25cdc46b5638d6d048533e/src/themes/wikimedia-ui.less#27
@padding-vertical-typeahead-suggestion: 8px;

.search-form__loader:after {
	// Set the i18n message.
	content: attr( data-loading-msg );
	//
	// Position loader below the input.
	display: flex;
	flex-direction: column;
	justify-content: center;
	position: absolute;
	top: 100%;
	width: 100%;
	height: ~'calc( @{padding-vertical-typeahead-suggestion} + @{size-search-figure} + @{padding-vertical-typeahead-suggestion} )';
	//
	// Ensure the 100% width doesn't extend beyond the input.
	box-sizing: border-box;
	//
	// Align loader style with input.
	border: @border-base;
	border-top-width: 0; // Hide the top border so it doesn't interfere with focus state.
	border-radius: 0 0 @border-radius-base @border-radius-base;
	box-shadow: @box-shadow-base;
	padding-left: @size-search-figure;
	//
	// Hide text in case it extends beyond the input.
	overflow: hidden;
	white-space: nowrap;
	text-overflow: ellipsis;
	//
	// Prevent Vector tabs from overlapping T254695#6461044
	z-index: @z-index-search-loader;
	//
	// Add a progress-bar to the loading indicator,
	// but only show it animating after 1 second of loading.
	background: /*image*/ linear-gradient( 90deg, @colorProgressive 0%, @colorProgressive 100% )
		/* position / size*/ -10% 0 ~'/' 0 2px
		/* repeat */ no-repeat,/*second bg, just color*/#fff;
	//
	// Animates the progress-bar.
	animation: /* name */ search-loader-progress-bar
		/* duration */ 1200ms
		/* timing function */ linear
		/* delay */ 500ms
		/* iteration count */ infinite
		/* fill direction */ alternate;
}

@keyframes search-loader-progress-bar {
	0% {
		background-size: 0 2px;
		background-position: -10% 0;
	}

	30% {
		background-size: 30% 2px;
		background-position: -10% 0;
	}

	70% {
		background-size: 30% 2px;
		background-position: 110% 0;
	}

	100% {
		background-size: 0 2px;
		background-position: 110% 0;
	}
}