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import { storiesOf } from '@storybook/react';
import React, { forwardRef, useRef, useState, useEffect, MutableRefObject } from 'react';
import { useEnsuredForwardedRef } from '../src';
import ShowDocs from './util/ShowDocs';
import { boolean, withKnobs } from '@storybook/addon-knobs';
const INITIAL_SIZE = {
width: null,
height: null,
};
const Demo = ({ activeForwardRef }) => {
const ref = useRef(null);
const [size, setSize] = useState(INITIAL_SIZE);
useEffect(() => {
handleClick();
}, [activeForwardRef]);
const handleClick = () => {
if (activeForwardRef) {
const { width, height } = ref.current.getBoundingClientRect();
setSize({
width,
height,
});
} else {
setSize(INITIAL_SIZE);
}
};
return (
<>
<button onClick={handleClick} disabled={!activeForwardRef}>
{activeForwardRef ? 'Update parent component' : 'forwardRef value is undefined'}
</button>
<div>Parent component using external ref: (textarea size)</div>
<pre>{JSON.stringify(size, null, 2)}</pre>
<Child ref={activeForwardRef ? ref : undefined} />
</>
);
};
const Child = forwardRef(({}, ref: MutableRefObject<HTMLTextAreaElement>) => {
const ensuredForwardRef = useEnsuredForwardedRef(ref);
const [size, setSize] = useState(INITIAL_SIZE);
useEffect(() => {
handleMouseUp();
}, []);
const handleMouseUp = () => {
const { width, height } = ensuredForwardRef.current.getBoundingClientRect();
setSize({
width,
height,
});
};
return (
<>
<div>Child forwardRef component using forwardRef: (textarea size)</div>
<pre>{JSON.stringify(size, null, 2)}</pre>
<div>You can resize this textarea:</div>
<textarea ref={ensuredForwardRef} onMouseUp={handleMouseUp} />
</>
);
});
storiesOf('Miscellaneous/useEnsuredForwardedRef', module)
.addDecorator(withKnobs)
.add('Docs', () => <ShowDocs md={require('../docs/useEnsuredForwardedRef.md')} />)
.add('Demo', () => {
const activeForwardRef = boolean('activeForwardRef', true);
return <Demo activeForwardRef={activeForwardRef} />;
});
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