kopia lustrzana https://github.com/shoelace-style/shoelace
fix(carousel): synchronize slides after scroll (#1923)
* fix(carousel): synchronize slides after scroll * chore: leftoverspull/1928/head
rodzic
f6d5344c44
commit
31f2600816
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@ -92,9 +92,6 @@ export default class SlCarousel extends ShoelaceElement {
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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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@ -102,35 +99,10 @@ export default class SlCarousel extends ShoelaceElement {
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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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@ -291,26 +263,52 @@ export default class SlCarousel extends ShoelaceElement {
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this.scrolling = true;
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}
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/** @internal Synchronizes the slides with the IntersectionObserver API. */
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private synchronizeSlides() {
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const io = new IntersectionObserver(
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entries => {
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io.disconnect();
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for (const entry of entries) {
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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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const firstIntersecting = entries.find(entry => entry.isIntersecting);
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if (firstIntersecting) {
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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 {
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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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}
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},
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{
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root: this.scrollContainer,
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threshold: 0.6
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}
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);
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this.getSlides({ excludeClones: false }).forEach(slide => {
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io.observe(slide);
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});
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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.synchronizeSlides();
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this.scrolling = false;
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}
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@ -337,14 +335,8 @@ export default class SlCarousel extends ShoelaceElement {
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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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@ -361,9 +353,7 @@ export default class SlCarousel extends ShoelaceElement {
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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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this.synchronizeSlides();
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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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@ -1,21 +1,39 @@
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import '../../../dist/shoelace.js';
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import { aTimeout, expect, fixture, html, nextFrame, oneEvent, waitUntil } from '@open-wc/testing';
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import { clickOnElement, dragElement, moveMouseOnElement } from '../../internal/test.js';
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import { expect, fixture, html, nextFrame, oneEvent } from '@open-wc/testing';
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import { map } from 'lit/directives/map.js';
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import { range } from 'lit/directives/range.js';
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import { resetMouse } from '@web/test-runner-commands';
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import sinon from 'sinon';
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import type { SinonStub } from 'sinon';
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import type SlCarousel from './carousel.js';
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describe('<sl-carousel>', () => {
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const sandbox = sinon.createSandbox();
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const ioCallbacks = new Map<IntersectionObserver, SinonStub>();
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const intersectionObserverCallbacks = () => {
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const callbacks = [...ioCallbacks.values()];
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return waitUntil(() => callbacks.every(callback => callback.called));
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};
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const OriginalIntersectionObserver = globalThis.IntersectionObserver;
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beforeEach(() => {
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globalThis.IntersectionObserver = class IntersectionObserverMock extends OriginalIntersectionObserver {
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constructor(callback: IntersectionObserverCallback, options?: IntersectionObserverInit) {
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const stubCallback = sandbox.stub().callsFake(callback);
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super(stubCallback, options);
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ioCallbacks.set(this, stubCallback);
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}
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};
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});
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afterEach(async () => {
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await resetMouse();
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});
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afterEach(() => {
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sandbox.restore();
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globalThis.IntersectionObserver = OriginalIntersectionObserver;
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ioCallbacks.clear();
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});
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it('should render a carousel with default configuration', async () => {
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@ -311,6 +329,7 @@ describe('<sl-carousel>', () => {
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await clickOnElement(nextButton);
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await oneEvent(el.scrollContainer, 'scrollend');
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await intersectionObserverCallbacks();
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await el.updateComplete;
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// Assert
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@ -337,13 +356,19 @@ describe('<sl-carousel>', () => {
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// Act
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await clickOnElement(nextButton);
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await aTimeout(50);
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await clickOnElement(nextButton);
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await aTimeout(50);
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await clickOnElement(nextButton);
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await aTimeout(50);
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await clickOnElement(nextButton);
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await aTimeout(50);
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await clickOnElement(nextButton);
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await aTimeout(50);
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await clickOnElement(nextButton);
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await oneEvent(el.scrollContainer, 'scrollend');
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await intersectionObserverCallbacks();
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await el.updateComplete;
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// Assert
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@ -502,6 +527,7 @@ describe('<sl-carousel>', () => {
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el.goToSlide(2, 'auto');
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await oneEvent(el.scrollContainer, 'scrollend');
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await intersectionObserverCallbacks();
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await el.updateComplete;
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// Act
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@ -537,6 +563,9 @@ describe('<sl-carousel>', () => {
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// wait scroll to actual item
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await oneEvent(el.scrollContainer, 'scrollend');
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await intersectionObserverCallbacks();
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await el.updateComplete;
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// Assert
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expect(nextButton).to.have.attribute('aria-disabled', 'false');
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expect(el.activeSlide).to.be.equal(0);
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@ -620,6 +649,8 @@ describe('<sl-carousel>', () => {
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// wait scroll to actual item
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await oneEvent(el.scrollContainer, 'scrollend');
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await intersectionObserverCallbacks();
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// Assert
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expect(previousButton).to.have.attribute('aria-disabled', 'false');
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expect(el.activeSlide).to.be.equal(2);
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@ -673,6 +704,7 @@ describe('<sl-carousel>', () => {
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el.goToSlide(1);
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await oneEvent(el.scrollContainer, 'scrollend');
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await intersectionObserverCallbacks();
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await nextFrame();
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sandbox.spy(el, 'goToSlide');
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@ -680,6 +712,7 @@ describe('<sl-carousel>', () => {
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// Act
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el.previous();
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await oneEvent(el.scrollContainer, 'scrollend');
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await intersectionObserverCallbacks();
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const containerRect = el.scrollContainer.getBoundingClientRect();
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const itemRect = expectedCarouselItem.getBoundingClientRect();
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@ -706,6 +739,7 @@ describe('<sl-carousel>', () => {
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// Act
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el.goToSlide(2);
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await oneEvent(el.scrollContainer, 'scrollend');
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await intersectionObserverCallbacks();
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await el.updateComplete;
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// Assert
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