kopia lustrzana https://github.com/shoelace-style/shoelace
593 wiersze
22 KiB
TypeScript
593 wiersze
22 KiB
TypeScript
import '../../internal/scrollend-polyfill.js';
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import { AutoplayController } from './autoplay-controller.js';
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import { clamp } from '../../internal/math.js';
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import { classMap } from 'lit/directives/class-map.js';
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import { eventOptions, property, query, state } from 'lit/decorators.js';
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import { html } from 'lit';
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import { LocalizeController } from '../../utilities/localize.js';
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import { map } from 'lit/directives/map.js';
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import { prefersReducedMotion } from '../../internal/animate.js';
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import { range } from 'lit/directives/range.js';
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import { waitForEvent } from '../../internal/event.js';
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import { watch } from '../../internal/watch.js';
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import componentStyles from '../../styles/component.styles.js';
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import ShoelaceElement from '../../internal/shoelace-element.js';
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import SlIcon from '../icon/icon.component.js';
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import styles from './carousel.styles.js';
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import type { CSSResultGroup, PropertyValueMap } from 'lit';
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import type SlCarouselItem from '../carousel-item/carousel-item.component.js';
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/**
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* @summary Carousels display an arbitrary number of content slides along a horizontal or vertical axis.
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*
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* @since 2.2
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* @status experimental
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*
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* @dependency sl-icon
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*
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* @event {{ index: number, slide: SlCarouselItem }} sl-slide-change - Emitted when the active slide changes.
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*
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* @slot - The carousel's main content, one or more `<sl-carousel-item>` elements.
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* @slot next-icon - Optional next icon to use instead of the default. Works best with `<sl-icon>`.
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* @slot previous-icon - Optional previous icon to use instead of the default. Works best with `<sl-icon>`.
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*
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* @csspart base - The carousel's internal wrapper.
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* @csspart scroll-container - The scroll container that wraps the slides.
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* @csspart pagination - The pagination indicators wrapper.
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* @csspart pagination-item - The pagination indicator.
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* @csspart pagination-item--active - Applied when the item is active.
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* @csspart navigation - The navigation wrapper.
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* @csspart navigation-button - The navigation button.
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* @csspart navigation-button--previous - Applied to the previous button.
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* @csspart navigation-button--next - Applied to the next button.
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*
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* @cssproperty --slide-gap - The space between each slide.
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* @cssproperty [--aspect-ratio=16/9] - The aspect ratio of each slide.
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* @cssproperty --scroll-hint - The amount of padding to apply to the scroll area, allowing adjacent slides to become
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* partially visible as a scroll hint.
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*/
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export default class SlCarousel extends ShoelaceElement {
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static styles: CSSResultGroup = [componentStyles, styles];
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static dependencies = { 'sl-icon': SlIcon };
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/** When set, allows the user to navigate the carousel in the same direction indefinitely. */
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@property({ type: Boolean, reflect: true }) loop = false;
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/** When set, show the carousel's navigation. */
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@property({ type: Boolean, reflect: true }) navigation = false;
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/** When set, show the carousel's pagination indicators. */
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@property({ type: Boolean, reflect: true }) pagination = false;
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/** When set, the slides will scroll automatically when the user is not interacting with them. */
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@property({ type: Boolean, reflect: true }) autoplay = false;
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/** Specifies the amount of time, in milliseconds, between each automatic scroll. */
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@property({ type: Number, attribute: 'autoplay-interval' }) autoplayInterval = 3000;
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/** Specifies how many slides should be shown at a given time. */
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@property({ type: Number, attribute: 'slides-per-page' }) slidesPerPage = 1;
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/**
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* Specifies the number of slides the carousel will advance when scrolling, useful when specifying a `slides-per-page`
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* greater than one. It can't be higher than `slides-per-page`.
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*/
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@property({ type: Number, attribute: 'slides-per-move' }) slidesPerMove = 1;
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/** Specifies the orientation in which the carousel will lay out. */
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@property() orientation: 'horizontal' | 'vertical' = 'horizontal';
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/** When set, it is possible to scroll through the slides by dragging them with the mouse. */
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@property({ type: Boolean, reflect: true, attribute: 'mouse-dragging' }) mouseDragging = false;
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@query('.carousel__slides') scrollContainer: HTMLElement;
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@query('.carousel__pagination') paginationContainer: HTMLElement;
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// The index of the active slide
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@state() activeSlide = 0;
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@state() scrolling = false;
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@state() dragging = false;
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private autoplayController = new AutoplayController(this, () => this.next());
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private intersectionObserver: IntersectionObserver; // determines which slide is displayed
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// A map containing the state of all the slides
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private readonly intersectionObserverEntries = new Map<Element, IntersectionObserverEntry>();
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private readonly localize = new LocalizeController(this);
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private mutationObserver: MutationObserver;
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connectedCallback(): void {
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super.connectedCallback();
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this.setAttribute('role', 'region');
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this.setAttribute('aria-label', this.localize.term('carousel'));
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const intersectionObserver = new IntersectionObserver(
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(entries: IntersectionObserverEntry[]) => {
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entries.forEach(entry => {
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// Store all the entries in a map to be processed when scrolling ends
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this.intersectionObserverEntries.set(entry.target, entry);
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const slide = entry.target;
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slide.toggleAttribute('inert', !entry.isIntersecting);
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slide.classList.toggle('--in-view', entry.isIntersecting);
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slide.setAttribute('aria-hidden', entry.isIntersecting ? 'false' : 'true');
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});
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},
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{
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root: this,
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threshold: 0.6
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}
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);
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this.intersectionObserver = intersectionObserver;
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// Store the initial state of each slide
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intersectionObserver.takeRecords().forEach(entry => {
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this.intersectionObserverEntries.set(entry.target, entry);
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});
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}
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disconnectedCallback(): void {
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super.disconnectedCallback();
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this.intersectionObserver.disconnect();
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this.mutationObserver.disconnect();
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}
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protected firstUpdated(): void {
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this.initializeSlides();
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this.mutationObserver = new MutationObserver(this.handleSlotChange);
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this.mutationObserver.observe(this, {
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childList: true,
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subtree: true
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});
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}
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protected willUpdate(changedProperties: PropertyValueMap<SlCarousel> | Map<PropertyKey, unknown>): void {
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// Ensure the slidesPerMove is never higher than the slidesPerPage
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if (changedProperties.has('slidesPerMove') || changedProperties.has('slidesPerPage')) {
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this.slidesPerMove = Math.min(this.slidesPerMove, this.slidesPerPage);
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}
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}
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private getPageCount() {
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const slidesCount = this.getSlides().length;
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const { slidesPerPage, slidesPerMove, loop } = this;
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const pages = loop ? slidesCount / slidesPerMove : (slidesCount - slidesPerPage) / slidesPerMove + 1;
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return Math.ceil(pages);
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}
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private getCurrentPage() {
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return Math.ceil(this.activeSlide / this.slidesPerMove);
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}
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private canScrollNext(): boolean {
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return this.loop || this.getCurrentPage() < this.getPageCount() - 1;
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}
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private canScrollPrev(): boolean {
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return this.loop || this.getCurrentPage() > 0;
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}
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/** @internal Gets all carousel items. */
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private getSlides({ excludeClones = true }: { excludeClones?: boolean } = {}) {
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return [...this.children].filter(
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(el: HTMLElement) => this.isCarouselItem(el) && (!excludeClones || !el.hasAttribute('data-clone'))
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) as SlCarouselItem[];
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}
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private handleKeyDown(event: KeyboardEvent) {
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if (['ArrowLeft', 'ArrowRight', 'ArrowUp', 'ArrowDown', 'Home', 'End'].includes(event.key)) {
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const target = event.target as HTMLElement;
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const isRtl = this.localize.dir() === 'rtl';
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const isFocusInPagination = target.closest('[part~="pagination-item"]') !== null;
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const isNext =
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event.key === 'ArrowDown' || (!isRtl && event.key === 'ArrowRight') || (isRtl && event.key === 'ArrowLeft');
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const isPrevious =
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event.key === 'ArrowUp' || (!isRtl && event.key === 'ArrowLeft') || (isRtl && event.key === 'ArrowRight');
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event.preventDefault();
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if (isPrevious) {
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this.previous();
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}
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if (isNext) {
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this.next();
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}
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if (event.key === 'Home') {
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this.goToSlide(0);
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}
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if (event.key === 'End') {
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this.goToSlide(this.getSlides().length - 1);
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}
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if (isFocusInPagination) {
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this.updateComplete.then(() => {
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const activePaginationItem = this.shadowRoot?.querySelector<HTMLButtonElement>(
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'[part~="pagination-item--active"]'
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);
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if (activePaginationItem) {
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activePaginationItem.focus();
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}
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});
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}
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}
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}
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private handleMouseDragStart(event: PointerEvent) {
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const canDrag = this.mouseDragging && event.button === 0;
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if (canDrag) {
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event.preventDefault();
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document.addEventListener('pointermove', this.handleMouseDrag, { capture: true, passive: true });
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document.addEventListener('pointerup', this.handleMouseDragEnd, { capture: true, once: true });
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}
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}
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private handleMouseDrag = (event: PointerEvent) => {
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if (!this.dragging) {
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// Start dragging if it hasn't yet
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this.scrollContainer.style.setProperty('scroll-snap-type', 'none');
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this.dragging = true;
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}
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this.scrollContainer.scrollBy({
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left: -event.movementX,
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top: -event.movementY,
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behavior: 'instant'
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});
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};
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private handleMouseDragEnd = () => {
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const scrollContainer = this.scrollContainer;
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document.removeEventListener('pointermove', this.handleMouseDrag, { capture: true });
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// get the current scroll position
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const startLeft = scrollContainer.scrollLeft;
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const startTop = scrollContainer.scrollTop;
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// remove the scroll-snap-type property so that the browser will snap the slide to the correct position
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scrollContainer.style.removeProperty('scroll-snap-type');
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// fix(safari): forcing a style recalculation doesn't seem to immediately update the scroll
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// position in Safari. Setting "overflow" to "hidden" should force this behavior.
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scrollContainer.style.setProperty('overflow', 'hidden');
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// get the final scroll position to the slide snapped by the browser
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const finalLeft = scrollContainer.scrollLeft;
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const finalTop = scrollContainer.scrollTop;
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// restore the scroll position to the original one, so that it can be smoothly animated if needed
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scrollContainer.style.removeProperty('overflow');
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scrollContainer.style.setProperty('scroll-snap-type', 'none');
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scrollContainer.scrollTo({ left: startLeft, top: startTop, behavior: 'instant' });
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requestAnimationFrame(async () => {
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if (startLeft !== finalLeft || startTop !== finalTop) {
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scrollContainer.scrollTo({
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left: finalLeft,
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top: finalTop,
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behavior: prefersReducedMotion() ? 'auto' : 'smooth'
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});
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await waitForEvent(scrollContainer, 'scrollend');
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}
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scrollContainer.style.removeProperty('scroll-snap-type');
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this.dragging = false;
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this.handleScrollEnd();
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});
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};
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@eventOptions({ passive: true })
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private handleScroll() {
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this.scrolling = true;
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}
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private handleScrollEnd() {
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if (!this.scrolling || this.dragging) return;
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const entries = [...this.intersectionObserverEntries.values()];
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const firstIntersecting: IntersectionObserverEntry | undefined = entries.find(entry => entry.isIntersecting);
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if (this.loop && firstIntersecting?.target.hasAttribute('data-clone')) {
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const clonePosition = Number(firstIntersecting.target.getAttribute('data-clone'));
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// Scrolls to the original slide without animating, so the user won't notice that the position has changed
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this.goToSlide(clonePosition, 'instant');
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} else if (firstIntersecting) {
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const slides = this.getSlides();
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// Update the current index based on the first visible slide
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const slideIndex = slides.indexOf(firstIntersecting.target as SlCarouselItem);
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// Set the index to the first "snappable" slide
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this.activeSlide = Math.ceil(slideIndex / this.slidesPerMove) * this.slidesPerMove;
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}
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this.scrolling = false;
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}
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private isCarouselItem(node: Node): node is SlCarouselItem {
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return node instanceof Element && node.tagName.toLowerCase() === 'sl-carousel-item';
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}
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private handleSlotChange = (mutations: MutationRecord[]) => {
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const needsInitialization = mutations.some(mutation =>
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[...mutation.addedNodes, ...mutation.removedNodes].some(
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(el: HTMLElement) => this.isCarouselItem(el) && !el.hasAttribute('data-clone')
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)
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);
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// Reinitialize the carousel if a carousel item has been added or removed
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if (needsInitialization) {
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this.initializeSlides();
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}
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this.requestUpdate();
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};
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@watch('loop', { waitUntilFirstUpdate: true })
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@watch('slidesPerPage', { waitUntilFirstUpdate: true })
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initializeSlides() {
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const intersectionObserver = this.intersectionObserver;
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this.intersectionObserverEntries.clear();
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// Removes all the cloned elements from the carousel
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this.getSlides({ excludeClones: false }).forEach((slide, index) => {
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intersectionObserver.unobserve(slide);
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slide.classList.remove('--in-view');
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slide.classList.remove('--is-active');
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slide.setAttribute('aria-label', this.localize.term('slideNum', index + 1));
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if (slide.hasAttribute('data-clone')) {
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slide.remove();
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}
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});
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this.updateSlidesSnap();
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if (this.loop) {
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// Creates clones to be placed before and after the original elements to simulate infinite scrolling
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this.createClones();
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}
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this.getSlides({ excludeClones: false }).forEach(slide => {
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intersectionObserver.observe(slide);
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});
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// Because the DOM may be changed, restore the scroll position to the active slide
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this.goToSlide(this.activeSlide, 'auto');
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}
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private createClones() {
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const slides = this.getSlides();
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const slidesPerPage = this.slidesPerPage;
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const lastSlides = slides.slice(-slidesPerPage);
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const firstSlides = slides.slice(0, slidesPerPage);
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lastSlides.reverse().forEach((slide, i) => {
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const clone = slide.cloneNode(true) as HTMLElement;
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clone.setAttribute('data-clone', String(slides.length - i - 1));
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this.prepend(clone);
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});
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firstSlides.forEach((slide, i) => {
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const clone = slide.cloneNode(true) as HTMLElement;
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clone.setAttribute('data-clone', String(i));
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this.append(clone);
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});
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}
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@watch('activeSlide')
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handelSlideChange() {
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const slides = this.getSlides();
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slides.forEach((slide, i) => {
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slide.classList.toggle('--is-active', i === this.activeSlide);
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});
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// Do not emit an event on first render
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if (this.hasUpdated) {
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this.emit('sl-slide-change', {
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detail: {
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index: this.activeSlide,
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slide: slides[this.activeSlide]
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}
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});
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}
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}
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@watch('slidesPerMove')
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updateSlidesSnap() {
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const slides = this.getSlides();
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const slidesPerMove = this.slidesPerMove;
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slides.forEach((slide, i) => {
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const shouldSnap = (i + slidesPerMove) % slidesPerMove === 0;
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if (shouldSnap) {
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slide.style.removeProperty('scroll-snap-align');
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} else {
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slide.style.setProperty('scroll-snap-align', 'none');
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}
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});
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}
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@watch('autoplay')
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handleAutoplayChange() {
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this.autoplayController.stop();
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if (this.autoplay) {
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this.autoplayController.start(this.autoplayInterval);
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}
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}
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/**
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* Move the carousel backward by `slides-per-move` slides.
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*
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* @param behavior - The behavior used for scrolling.
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*/
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previous(behavior: ScrollBehavior = 'smooth') {
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this.goToSlide(this.activeSlide - this.slidesPerMove, behavior);
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}
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/**
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* Move the carousel forward by `slides-per-move` slides.
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*
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* @param behavior - The behavior used for scrolling.
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*/
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next(behavior: ScrollBehavior = 'smooth') {
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this.goToSlide(this.activeSlide + this.slidesPerMove, behavior);
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}
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/**
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* Scrolls the carousel to the slide specified by `index`.
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*
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* @param index - The slide index.
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* @param behavior - The behavior used for scrolling.
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*/
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goToSlide(index: number, behavior: ScrollBehavior = 'smooth') {
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const { slidesPerPage, loop } = this;
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const slides = this.getSlides();
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const slidesWithClones = this.getSlides({ excludeClones: false });
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// No need to do anything in case there are no items in the carousel
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if (!slides.length) {
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return;
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}
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// Sets the next index without taking into account clones, if any.
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const newActiveSlide = loop ? (index + slides.length) % slides.length : clamp(index, 0, slides.length - 1);
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this.activeSlide = newActiveSlide;
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// Get the index of the next slide. For looping carousel it adds `slidesPerPage`
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// to normalize the starting index in order to ignore the first nth clones.
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const nextSlideIndex = clamp(index + (loop ? slidesPerPage : 0), 0, slidesWithClones.length - 1);
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const nextSlide = slidesWithClones[nextSlideIndex];
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this.scrollToSlide(nextSlide, prefersReducedMotion() ? 'auto' : behavior);
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}
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private scrollToSlide(slide: HTMLElement, behavior: ScrollBehavior = 'smooth') {
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const scrollContainer = this.scrollContainer;
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const scrollContainerRect = scrollContainer.getBoundingClientRect();
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const nextSlideRect = slide.getBoundingClientRect();
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const nextLeft = nextSlideRect.left - scrollContainerRect.left;
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const nextTop = nextSlideRect.top - scrollContainerRect.top;
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scrollContainer.scrollTo({
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left: nextLeft + scrollContainer.scrollLeft,
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top: nextTop + scrollContainer.scrollTop,
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behavior
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});
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}
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render() {
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const { slidesPerMove, scrolling } = this;
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const pagesCount = this.getPageCount();
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const currentPage = this.getCurrentPage();
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const prevEnabled = this.canScrollPrev();
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const nextEnabled = this.canScrollNext();
|
|
const isLtr = this.localize.dir() === 'ltr';
|
|
|
|
return html`
|
|
<div part="base" class="carousel">
|
|
<div
|
|
id="scroll-container"
|
|
part="scroll-container"
|
|
class="${classMap({
|
|
carousel__slides: true,
|
|
'carousel__slides--horizontal': this.orientation === 'horizontal',
|
|
'carousel__slides--vertical': this.orientation === 'vertical',
|
|
'carousel__slides--dragging': this.dragging
|
|
})}"
|
|
style="--slides-per-page: ${this.slidesPerPage};"
|
|
aria-busy="${scrolling ? 'true' : 'false'}"
|
|
aria-atomic="true"
|
|
tabindex="0"
|
|
@keydown=${this.handleKeyDown}
|
|
@mousedown="${this.handleMouseDragStart}"
|
|
@scroll="${this.handleScroll}"
|
|
@scrollend=${this.handleScrollEnd}
|
|
>
|
|
<slot></slot>
|
|
</div>
|
|
|
|
${this.navigation
|
|
? html`
|
|
<div part="navigation" class="carousel__navigation">
|
|
<button
|
|
part="navigation-button navigation-button--previous"
|
|
class="${classMap({
|
|
'carousel__navigation-button': true,
|
|
'carousel__navigation-button--previous': true,
|
|
'carousel__navigation-button--disabled': !prevEnabled
|
|
})}"
|
|
aria-label="${this.localize.term('previousSlide')}"
|
|
aria-controls="scroll-container"
|
|
aria-disabled="${prevEnabled ? 'false' : 'true'}"
|
|
@click=${prevEnabled ? () => this.previous() : null}
|
|
>
|
|
<slot name="previous-icon">
|
|
<sl-icon library="system" name="${isLtr ? 'chevron-left' : 'chevron-right'}"></sl-icon>
|
|
</slot>
|
|
</button>
|
|
|
|
<button
|
|
part="navigation-button navigation-button--next"
|
|
class=${classMap({
|
|
'carousel__navigation-button': true,
|
|
'carousel__navigation-button--next': true,
|
|
'carousel__navigation-button--disabled': !nextEnabled
|
|
})}
|
|
aria-label="${this.localize.term('nextSlide')}"
|
|
aria-controls="scroll-container"
|
|
aria-disabled="${nextEnabled ? 'false' : 'true'}"
|
|
@click=${nextEnabled ? () => this.next() : null}
|
|
>
|
|
<slot name="next-icon">
|
|
<sl-icon library="system" name="${isLtr ? 'chevron-right' : 'chevron-left'}"></sl-icon>
|
|
</slot>
|
|
</button>
|
|
</div>
|
|
`
|
|
: ''}
|
|
${this.pagination
|
|
? html`
|
|
<div part="pagination" role="tablist" class="carousel__pagination" aria-controls="scroll-container">
|
|
${map(range(pagesCount), index => {
|
|
const isActive = index === currentPage;
|
|
return html`
|
|
<button
|
|
part="pagination-item ${isActive ? 'pagination-item--active' : ''}"
|
|
class="${classMap({
|
|
'carousel__pagination-item': true,
|
|
'carousel__pagination-item--active': isActive
|
|
})}"
|
|
role="tab"
|
|
aria-selected="${isActive ? 'true' : 'false'}"
|
|
aria-label="${this.localize.term('goToSlide', index + 1, pagesCount)}"
|
|
tabindex=${isActive ? '0' : '-1'}
|
|
@click=${() => this.goToSlide(index * slidesPerMove)}
|
|
@keydown=${this.handleKeyDown}
|
|
></button>
|
|
`;
|
|
})}
|
|
</div>
|
|
`
|
|
: ''}
|
|
</div>
|
|
`;
|
|
}
|
|
}
|