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index.tsx
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index.tsx
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import { custom } from '@recoiljs/refine'
import { atom, useRecoilState } from 'recoil'
import { syncEffect } from 'recoil-sync'
import styles from './index.module.css'
export class ViewState {
constructor(public active: boolean, public pos: [number, number]) {}
}
const viewStateChecker = custom((x) => (x instanceof ViewState ? x : null))
const viewState = atom<ViewState>({
key: 'viewState',
default: new ViewState(true, [1, 2]),
effects: [
syncEffect({ storeKey: 'url-transit-store', refine: viewStateChecker }),
],
})
export const ViewStateForm: React.FC = () => {
const [state, setState] = useRecoilState(viewState)
const toggleActive = () => setState(new ViewState(!state.active, state.pos))
const incrementPos = () =>
setState(new ViewState(state.active, [state.pos[0] + 1, state.pos[1] + 1]))
return (
<div>
<div className={styles.row}>
active:{' '}
<input type="checkbox" checked={state.active} onChange={toggleActive} />
</div>
<div className={styles.row}>
<div>pos: {JSON.stringify(state.pos)}</div>
<button onClick={incrementPos}>increment</button>
</div>
</div>
)
}