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import { useEffect } from '@wordpress/element' |
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|
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export const useAnimatedHeight = (preview, blockHeight, ready) => { |
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useEffect(() => { |
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let raf1, raf2 |
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if (!preview.current) return |
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const p = preview.current |
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const iframe = p?.querySelector('iframe[title]') |
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if (!iframe) return |
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const content = iframe.contentWindow.document.body |
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const scale = preview.offsetWidth / 1400 |
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iframe.style.maxHeight = `${blockHeight / scale}px` |
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|
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const handleIn = () => { |
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// The live component changes over time so easier to query on demand |
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const height = content.offsetHeight |
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content.style.transitionDuration = Math.max(height * 3, 3000) + 'ms' |
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raf1 = window.requestAnimationFrame(() => { |
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content.style.top = Math.abs(height - blockHeight) * -1 + 'px' |
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}) |
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} |
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const handleOut = () => { |
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const height = content.offsetHeight |
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content.style.transitionDuration = height / 1.5 + 'ms' |
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raf2 = window.requestAnimationFrame(() => { |
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content.style.top = 0 |
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}) |
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} |
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|
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p.addEventListener('focus', handleIn) |
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p.addEventListener('mouseenter', handleIn) |
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p.addEventListener('blur', handleOut) |
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p.addEventListener('mouseleave', handleOut) |
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return () => { |
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window.cancelAnimationFrame(raf1) |
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window.cancelAnimationFrame(raf2) |
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p.removeEventListener('focus', handleIn) |
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p.removeEventListener('mouseenter', handleIn) |
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p.removeEventListener('blur', handleOut) |
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p.removeEventListener('mouseleave', handleOut) |
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} |
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}, [blockHeight, preview, ready]) |
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} |
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