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/**
* External dependencies
*/
import classnames from 'classnames';
import ResizeObserver from 'resize-observer-polyfill';
import { __ } from '@wordpress/i18n';
import { Component, createRef } from '@wordpress/element';
import { isBlobURL } from '@wordpress/blob';
import { isEqual } from 'lodash';
import { RichText } from '@wordpress/editor';
import { Spinner } from '@wordpress/components';
/**
* Internal dependencies
*/
import createSwiper from './create-swiper';
import {
swiperApplyAria,
swiperInit,
swiperPaginationRender,
swiperResize,
} from './swiper-callbacks';
class Slideshow extends Component {
pendingRequestAnimationFrame = null;
resizeObserver = null;
static defaultProps = {
effect: 'slide',
};
constructor( props ) {
super( props );
this.slideshowRef = createRef();
this.btnNextRef = createRef();
this.btnPrevRef = createRef();
this.paginationRef = createRef();
}
componentDidMount() {
const { onError } = this.props;
this.buildSwiper()
.then( swiper => {
this.swiperInstance = swiper;
this.initializeResizeObserver( swiper );
} )
.catch( () => {
onError( __( 'The Swiper library could not be loaded.', 'jetpack' ) );
} );
}
componentWillUnmount() {
this.clearResizeObserver();
this.clearPendingRequestAnimationFrame();
}
componentDidUpdate( prevProps ) {
const { align, autoplay, delay, effect, images, onError } = this.props;
/* A change in alignment or images only needs an update */
if ( align !== prevProps.align || ! isEqual( images, prevProps.images ) ) {
this.swiperInstance && this.swiperInstance.update();
}
/* A change in effect requires a full rebuild */
if (
effect !== prevProps.effect ||
autoplay !== prevProps.autoplay ||
delay !== prevProps.delay ||
images !== prevProps.images
) {
let realIndex;
if ( ! this.swiperIndex ) {
realIndex = 0;
} else if ( images.length === prevProps.images.length ) {
realIndex = this.swiperInstance.realIndex;
} else {
realIndex = prevProps.images.length;
}
this.swiperInstance && this.swiperInstance.destroy( true, true );
this.buildSwiper( realIndex )
.then( swiper => {
this.swiperInstance = swiper;
this.initializeResizeObserver( swiper );
} )
.catch( () => {
onError( __( 'The Swiper library could not be loaded.', 'jetpack' ) );
} );
}
}
initializeResizeObserver = swiper => {
this.clearResizeObserver();
this.resizeObserver = new ResizeObserver( () => {
this.clearPendingRequestAnimationFrame();
this.pendingRequestAnimationFrame = requestAnimationFrame( () => {
swiperResize( swiper );
swiper.update();
} );
} );
this.resizeObserver.observe( swiper.el );
};
clearPendingRequestAnimationFrame = () => {
if ( this.pendingRequestAnimationFrame ) {
cancelAnimationFrame( this.pendingRequestAnimationFrame );
this.pendingRequestAnimationFrame = null;
}
};
clearResizeObserver = () => {
if ( this.resizeObserver ) {
this.resizeObserver.disconnect();
this.resizeObserver = null;
}
};
render() {
const { autoplay, className, delay, effect, images } = this.props;
// Note: React omits the data attribute if the value is null, but NOT if it is false.
// This is the reason for the unusual logic related to autoplay below.
/* eslint-disable jsx-a11y/anchor-is-valid */
return (
<div
className={ className }
data-autoplay={ autoplay || null }
data-delay={ autoplay ? delay : null }
data-effect={ effect }
>
<div
className="wp-block-jetpack-slideshow_container swiper-container"
ref={ this.slideshowRef }
>
<ul className="wp-block-jetpack-slideshow_swiper-wrappper swiper-wrapper">
{ images.map( ( { alt, caption, id, url } ) => (
<li
className={ classnames(
'wp-block-jetpack-slideshow_slide',
'swiper-slide',
isBlobURL( url ) && 'is-transient'
) }
key={ id }
>
<figure>
<img
alt={ alt }
className={
`wp-block-jetpack-slideshow_image wp-image-${ id }` /* wp-image-${ id } makes WordPress add a srcset */
}
data-id={ id }
src={ url }
/>
{ isBlobURL( url ) && <Spinner /> }
{ caption && (
<RichText.Content
className="wp-block-jetpack-slideshow_caption gallery-caption"
tagName="figcaption"
value={ caption }
/>
) }
</figure>
</li>
) ) }
</ul>
<a
className="wp-block-jetpack-slideshow_button-prev swiper-button-prev swiper-button-white"
ref={ this.btnPrevRef }
role="button"
/>
<a
className="wp-block-jetpack-slideshow_button-next swiper-button-next swiper-button-white"
ref={ this.btnNextRef }
role="button"
/>
<a
aria-label="Pause Slideshow"
className="wp-block-jetpack-slideshow_button-pause"
role="button"
/>
<div
className="wp-block-jetpack-slideshow_pagination swiper-pagination swiper-pagination-white"
ref={ this.paginationRef }
/>
</div>
</div>
);
/* eslint-enable jsx-a11y/anchor-is-valid */
}
prefersReducedMotion = () => {
return (
typeof window !== 'undefined' &&
window.matchMedia( '(prefers-reduced-motion: reduce)' ).matches
);
};
buildSwiper = ( initialSlide = 0 ) =>
// Using refs instead of className-based selectors allows us to
// have multiple swipers on one page without collisions, and
// without needing to add IDs or the like.
createSwiper(
this.slideshowRef.current,
{
autoplay:
this.props.autoplay && ! this.prefersReducedMotion()
? {
delay: this.props.delay * 1000,
disableOnInteraction: false,
}
: false,
effect: this.props.effect,
loop: true,
initialSlide,
navigation: {
nextEl: this.btnNextRef.current,
prevEl: this.btnPrevRef.current,
},
pagination: {
clickable: true,
el: this.paginationRef.current,
type: 'bullets',
},
},
{
init: swiperInit,
imagesReady: swiperResize,
paginationRender: swiperPaginationRender,
transitionEnd: swiperApplyAria,
}
);
}
export default Slideshow;
|
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