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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: 'history-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>
)
}