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import { useState, useEffect, useRef, useCallback } from '@wordpress/element';
import { debounce } from 'lodash';
import { useIsMounted } from '@library/hooks/useIsMounted';
import { useGlobalsStore } from '@library/state/global';
import { requiredCSSVars } from '@library/util/css';
import { hasCSSVar } from '@library/util/dom';

const originalHeights = new WeakMap();

export const usePreviewIframe = ({
	container,
	onIFrameLoaded,
	ready,
	loadDelay,
}) => {
	const isMounted = useIsMounted();
	const [waitForIframe, setWaitForIframe] = useState(0);
	const [iFrame, setIFrame] = useState(null);
	const [maybeOk, setMaybeOk] = useState(false);
	const isUpdating = useRef(false);
	const { addMissingCSSVar } = useGlobalsStore();

// Add the missing variable to the global state to be imported later
				addMissingCSSVar(key);
				// Dive into iframe and add the variables to at the :root scope
				frame.contentDocument.documentElement.style.setProperty(
					key,
					requiredCSSVars[key],
				);
			}
		},
		[addMissingCSSVar],
	);

const updateCoverBlocks = useCallback(async (frame, cntnr) => {
		const ft = frame.getBoundingClientRect().top;
		const ct = cntnr.getBoundingClientRect().top;
		// If they have scrolled, don't mess with it
		if (ft < ct) return;

isUpdating.current = true;

let scale = cntnr
			.querySelector('[style*="scale"]')
			?.style?.transform?.match(/scale$(.*?)$/)?.[1];
		scale = scale ? parseFloat(scale) : null;

const cntnrHScaled = cntnr.offsetHeight / (scale ?? 1);
		frame.style.setProperty('max-height', `${cntnrHScaled}px`, 'important');

const coverBlocks =
			frame.contentDocument.querySelectorAll('.wp-block-cover');
		for (const el of coverBlocks) {
			if (!originalHeights.has(el)) {
				// Cache the original 'vh' value
				originalHeights.set(el, el.style.minHeight);
			}

// Reapply the original 'vh' value so it can be used in computations
			el.style.minHeight = originalHeights.get(el);
		}

cntnr.offsetHeight; // Force a reflow
		// Give the browser time to paint
		await new Promise((resolve) => requestAnimationFrame(resolve));
		await new Promise((resolve) => requestAnimationFrame(resolve));

for (const el of coverBlocks) {
			if (!frame.contentDocument?.defaultView) return;
			// Get the computed height in px and use it for your calculation
			const computedHeight = parseFloat(
				frame.contentDocument.defaultView.getComputedStyle(el).height,
			);
			el.offsetHeight; // Force a reflow
			el.style.minHeight =
				computedHeight > 500 ? '500px' : computedHeight + 'px';
		}

frame.style.setProperty('max-height', 'none', 'important');
		isUpdating.current = false;
	}, []);

useEffect(() => {
		if (!ready) return;
		// continuously check for iframe
		const interval = setTimeout(() => {
			if (iFrame) return;
			const frame = container?.querySelector('iframe[title]');

// If not found, retry by updating state
			if (!frame) return setWaitForIframe((prev) => prev + 1);
			setIFrame(frame);
			requestAnimationFrame(() => onIFrameLoaded(frame, container));
		}, 100);
		return () => clearTimeout(interval);
	}, [iFrame, ready, waitForIframe, container, onIFrameLoaded]);

useEffect(() => {
		setMaybeOk(false);
		// After the iFrame is found, wait for it to load
		// Note: using load event is not reliable
		if (!iFrame?.contentDocument) return;

const config = {
			attributes: false,
			childList: true,
			subtree: true,
		};

// Run once in case the iframe is already loaded
		requestAnimationFrame(() => loaded(iFrame, container));

// Continuously check for changes
		const loaded = debounce(async () => {
			if (!isMounted.current || isUpdating.current) return;
			m.disconnect();

await updateCoverBlocks(iFrame, container);
			if (window.extSharedData.themeSlug !== 'extendable') {
				await addMissingThemeVars(iFrame, container);
			}
			// Reconnect observer after making changes
			setTimeout(() => setMaybeOk(true), loadDelay);
			if (isMounted.current) m.observe(iFrame.contentDocument, config);
		}, 300);

const m = new MutationObserver(loaded);
		m.observe(iFrame.contentDocument, config);

return () => {
			loaded.cancel();
			m?.disconnect();
		};
	}, [
		iFrame,
		container,
		isMounted,
		ready,
		updateCoverBlocks,
		addMissingThemeVars,
		loadDelay,
	]);

return { loading: !iFrame, ready: maybeOk };
};

Nama File / Folder	Size	Action
useCategories.js	0.846KB	Edit File Delete File Rename
useIsMounted.js	0.453KB	Edit File Delete File Rename
usePatterns.js	1.212KB	Edit File Delete File Rename
usePreviewIframe.js	4.906KB	Edit File Delete File Rename