mediawiki-skins-Vector/resources/skins.vector.styles/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.
 *
 **/
#simpleSearch.search-form__loader:after {
	// Set the i18n message.
	content: attr( data-loading-msg );
	//
	// Position loader below the input.
	display: block;
	position: absolute;
	//
	// IE9-11 have some issues, but not with this basic use-case.
	top: 100%;
	width: 100%;
	//
	// Ensure it 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;
	color: @color-base--disabled;
	font-size: @font-size-notification;
	padding: 0.4em;
	.box-shadow( @boxShadowWidget );
	//
	// Hide text in case it extends beyond the input.
	overflow: hidden;
	white-space: nowrap;
	text-overflow: ellipsis;
	//
	// 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 */ 1000ms
		/* 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;
	}
}