Image Reveal

<figure class="kodza-image-reveal">
  <div class="kodza-image-reveal__frame"><img src="https://kodza.dev/media/kz-steps-1400.webp" alt="Concrete steps climbing towards the light" width="1400" height="933" /></div>
  <figcaption class="kodza-image-reveal__caption">Steps — they lead somewhere, eventually.</figcaption>
</figure>

<figure class="kodza-image-reveal" data-from="left">
  <div class="kodza-image-reveal__frame"><img src="https://kodza.dev/media/kz-columns-1400.webp" alt="A row of concrete columns casting long shadows" width="1120" height="1400" /></div>
  <figcaption class="kodza-image-reveal__caption">Columns — seven of them, no meetings.</figcaption>
</figure>

<figure class="kodza-image-reveal" data-from="center">
  <div class="kodza-image-reveal__frame"><img src="https://kodza.dev/media/kz-arch-1400.webp" alt="A concrete wall with a round-topped opening" width="1400" height="1400" /></div>
  <figcaption class="kodza-image-reveal__caption">Arch — the only door in the building.</figcaption>
</figure>

/* Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license */
/* Kodza — Image Reveal
   A picture that unveils itself when it comes into view: a curtain opens (from below by
   default, data-from="left", or "center" like an iris) while the picture settles from a
   slight zoom, then its caption rises. Without the script it is simply there.
   "kodza:replay" plays it again. Everything is tuned with the --kz-image-reveal-* variables. */
.kodza-image-reveal {
  --kz-image-reveal-duration: 1.1s;
  --kz-image-reveal-ease: cubic-bezier(0.76, 0, 0.24, 1);
  --kz-image-reveal-settle: cubic-bezier(0.22, 1, 0.36, 1);
  --kz-image-reveal-radius: 12px;
  --kz-image-reveal-muted: rgba(10, 10, 10, 0.62);

  display: grid;
  gap: 12px;
  margin: 0;
}

.kodza-image-reveal__frame {
  aspect-ratio: 4 / 5;
  overflow: hidden;
  border-radius: var(--kz-image-reveal-radius);
  clip-path: inset(0 round var(--kz-image-reveal-radius));
  transition: clip-path var(--kz-image-reveal-duration) var(--kz-image-reveal-ease);
}

.kodza-image-reveal__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform calc(var(--kz-image-reveal-duration) * 1.5) var(--kz-image-reveal-settle);
}

.kodza-image-reveal__caption {
  overflow: hidden;
  color: var(--kz-image-reveal-muted);
  font-family: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
  transition: opacity 0.6s ease calc(var(--kz-image-reveal-duration) * 0.6), transform 0.8s var(--kz-image-reveal-settle) calc(var(--kz-image-reveal-duration) * 0.6);
}

/* Waiting to be seen (only once the script is there) */
.kodza-image-reveal.is-ready:not(.is-shown) .kodza-image-reveal__frame {
  clip-path: inset(100% 0 0 0 round var(--kz-image-reveal-radius));
  transition: none;
}

.kodza-image-reveal.is-ready[data-from="left"]:not(.is-shown) .kodza-image-reveal__frame {
  clip-path: inset(0 100% 0 0 round var(--kz-image-reveal-radius));
}

.kodza-image-reveal.is-ready[data-from="center"]:not(.is-shown) .kodza-image-reveal__frame {
  clip-path: inset(46% 40% round 999px);
}

.kodza-image-reveal.is-ready:not(.is-shown) .kodza-image-reveal__frame img {
  transform: scale(1.3);
  transition: none;
}

.kodza-image-reveal.is-ready:not(.is-shown) .kodza-image-reveal__caption {
  opacity: 0;
  transform: translateY(10px);
  transition: none;
}

@media (prefers-reduced-motion: reduce) {
  .kodza-image-reveal__frame,
  .kodza-image-reveal__frame img,
  .kodza-image-reveal__caption {
    transition: none !important;
  }
}

/* Theming example — on a dark background:
.dark-section .kodza-image-reveal {
  --kz-image-reveal-muted: rgba(242, 242, 240, 0.62);
}
*/

/* kodza-guard a3144330718e — generated by Kodza, do not edit.
   Theme guard: keeps a site's own CSS (WordPress themes, Bootstrap, CSS resets…) off this
   component. :not(#_) is always true and weighs as much as an id, so these lines win over
   theme rules made of classes and tags. Customise the component through its --kz-* variables. */

/* What the browser gives, on everything the component leaves to it */

.kodza-image-reveal:not(#_) {
  border: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-image-reveal__frame:not(#_) {
  box-sizing: revert;
}

.kodza-image-reveal__caption:not(#_) {
  border: revert;
  margin: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-image-reveal__frame img:where(:not([class*="kodza-"])):not(#_) {
  border: revert;
  margin: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-image-reveal__caption:not(#_):where(:not([hidden])) {
  display: revert;
}

.kodza-image-reveal__caption:not(#_):where([hidden]) {
  display: none;
}

/* The component's own rules, one step stronger: real buttons and fields, what it sets on tags themes style (links, lists, headings, images…), and the root width (a theme may narrow it, never widen it) */

.kodza-image-reveal:not(#_) {
  display: grid;
}

.kodza-image-reveal__frame img:not(#_) {
  display: block;
  transition: transform calc(var(--kz-image-reveal-duration) * 1.5) var(--kz-image-reveal-settle);
}

.kodza-image-reveal__caption:not(#_) {
  color: var(--kz-image-reveal-muted);
  font-family: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
  transition: opacity 0.6s ease calc(var(--kz-image-reveal-duration) * 0.6), transform 0.8s var(--kz-image-reveal-settle) calc(var(--kz-image-reveal-duration) * 0.6);
}

.kodza-image-reveal.is-ready:not(.is-shown) .kodza-image-reveal__frame img:not(#_) {
  transition: none;
}

.kodza-image-reveal.is-ready:not(.is-shown) .kodza-image-reveal__caption:not(#_) {
  transition: none;
}

@media (prefers-reduced-motion: reduce) {
  .kodza-image-reveal__frame img:not(#_),
  .kodza-image-reveal__caption:not(#_) {
    transition: none !important;
  }
}

// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Kodza — Image Reveal
// Unveils each picture the first time a third of it is in view (and again on
// "kodza:replay"), once its image has loaded, so the curtain never opens on an empty frame.
(() => {
  const SELECTOR = '.kodza-image-reveal';
  const reduceMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  const loaded = (root, signal) => {
    const img = root.querySelector('img');
    return !img || img.complete ? Promise.resolve() : new Promise((resolve) => {
      img.addEventListener('load', resolve, { once: true, signal });
      img.addEventListener('error', resolve, { once: true, signal });
    });
  };
  const show = (root, signal) => loaded(root, signal).then(() => requestAnimationFrame(() => {
    if (signal.aborted) return;
    root.classList.add('is-shown');
  }));

  // One instance. Everything it starts is tied to `signal`, so kodza:destroy stops it all
  function mount(root, signal) {
    root.addEventListener('kodza:replay', () => {
      root.classList.remove('is-shown');
      void root.offsetWidth;
      show(root, signal);
    }, { signal });
    if (reduceMotion || !('IntersectionObserver' in window)) return root.classList.add('is-shown');
    const io = new IntersectionObserver(([entry]) => {
      if (!entry.isIntersecting) return;
      io.disconnect();
      show(root, signal);
    }, { threshold: 0.33 });
    io.observe(root);
    signal.addEventListener('abort', () => io.disconnect());
  }

  // Kodza lifecycle, the same in every component: `kodza:init` starts the instances inside
  // event.detail.root (the whole page by default), `kodza:destroy` stops them and puts their
  // markup back. For themes and apps that swap content without a page load.
  const instances = new WeakMap();
  const find = (scope = document) => [scope, ...scope.querySelectorAll(SELECTOR)].filter((el) => el.matches?.(SELECTOR));
  const init = (scope) => find(scope).forEach((root) => {
    if (root.classList.contains('is-ready')) return; // already running, maybe from another copy of this script
    const controller = new AbortController();
    instances.set(root, { controller, html: root.innerHTML, attrs: [...root.attributes].map((a) => [a.name, a.value]) });
    mount(root, controller.signal);
    root.classList.add('is-ready');
  });
  const destroy = (scope) => find(scope).forEach((root) => {
    const instance = instances.get(root);
    if (!instance) return;
    instances.delete(root);
    instance.controller.abort();
    [...root.attributes].forEach((a) => root.removeAttribute(a.name));
    instance.attrs.forEach(([name, value]) => root.setAttribute(name, value));
    root.innerHTML = instance.html;
  });
  document.addEventListener('kodza:init', (event) => init(event.detail?.root));
  document.addEventListener('kodza:destroy', (event) => destroy(event.detail?.root));
  init();
  // Loaded in <head>, the script runs before the markup exists: once more when it is parsed
  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', () => init(), { once: true });
})();

'use client';
// Kodza — Image Reveal, for React. From https://kodza.dev/components/image-reveal/
// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Next to this file: image-reveal.css and image-reveal.js, the component's CSS and JS from Kodza, as they are.
// Yours to edit: the markup is plain JSX below.
// The script changes this markup once React has rendered it (it adds layers, splits text, moves
// nodes), so React must not patch it afterwards. When a prop changes, the key gives React a fresh
// element: kodza:destroy stops the script on the old one, kodza:init starts it on the new one.
import { useRef, useEffect, type ComponentPropsWithoutRef, type ComponentRef, type CSSProperties } from 'react';
import './image-reveal.css';

export type ImageRevealProps = Omit<ComponentPropsWithoutRef<'figure'>, "children" | "vars" | "from"> & {
  /** data-from on the root */
  from?: "left" | "center";
  /** Settings, as CSS variables on the root */
  vars?: {
    /** default: 1.1s */
    "--kz-image-reveal-duration"?: string | number;
    /** default: cubic-bezier(0.76, 0, 0.24, 1) */
    "--kz-image-reveal-ease"?: string | number;
    /** default: cubic-bezier(0.22, 1, 0.36, 1) */
    "--kz-image-reveal-settle"?: string | number;
    /** default: 12px */
    "--kz-image-reveal-radius"?: string | number;
    /** default: rgba(10, 10, 10, 0.62) */
    "--kz-image-reveal-muted"?: string | number;
  };
  /** The text, plain: the script reads it and rebuilds the markup around it */
  children?: string;
  className?: string;
};

export function ImageReveal({ from, vars, children = "Steps — they lead somewhere, eventually.", className, style, ...rest }: ImageRevealProps) {
  const ref = useRef<ComponentRef<'figure'>>(null);
  const classes = ["kodza-image-reveal", className].filter(Boolean).join(' ');
  // Everything the markup is made of: when it changes, React gets a fresh element (see the top)
  const key = JSON.stringify([classes, from, vars, children, style, rest]);

  // Starts the script on this element once React has rendered it, stops it when it goes
  useEffect(() => {
    const root = ref.current;
    let live = true;
    // @ts-ignore: a plain script, no types to find
    import('./image-reveal.js').then(() => {
      if (live) document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root } }));
    });
    return () => {
      live = false;
      document.dispatchEvent(new CustomEvent('kodza:destroy', { detail: { root } }));
    };
  }, [key]);

  return (
    <figure key={key} {...rest} className={classes} data-from={from} style={{ ...vars, ...style } as CSSProperties} ref={ref}>
      <div className="kodza-image-reveal__frame">
        <img src="https://kodza.dev/media/kz-steps-1400.webp" alt="Concrete steps climbing towards the light" width="1400" height="933" />
      </div>
      <figcaption className="kodza-image-reveal__caption">{children}</figcaption>
    </figure>
  );
}