catstodon/app/javascript/mastodon/components/collapsable.js

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import React from 'react';
import Motion from '../features/ui/util/optional_motion';
import spring from 'react-motion/lib/spring';
import PropTypes from 'prop-types';
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const Collapsable = ({ fullHeight, isVisible, children }) => (
<Motion defaultStyle={{ opacity: !isVisible ? 0 : 100, height: isVisible ? fullHeight : 0 }} style={{ opacity: spring(!isVisible ? 0 : 100), height: spring(!isVisible ? 0 : fullHeight) }}>
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{({ opacity, height }) => (
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<div style={{ height: `${height}px`, overflow: 'hidden', opacity: opacity / 100, display: Math.floor(opacity) === 0 ? 'none' : 'block' }}>
{children}
</div>
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)}
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</Motion>
);
Collapsable.propTypes = {
fullHeight: PropTypes.number.isRequired,
isVisible: PropTypes.bool.isRequired,
children: PropTypes.node.isRequired,
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};
export default Collapsable;