83a2ddedd4
* Add React.emomo to some components * Linting * useCallback for callbacks * Additional useCallback impl.
36 lines
1.1 KiB
TypeScript
36 lines
1.1 KiB
TypeScript
// Copyright 2017-2020 @polkadot/react-hooks authors & contributors
|
|
// This software may be modified and distributed under the terms
|
|
// of the Apache-2.0 license. See the LICENSE file for details.
|
|
|
|
import { useEffect, useState } from 'react';
|
|
import addressObservable from '@polkadot/ui-keyring/observable/addresses';
|
|
|
|
import useIsMountedRef from './useIsMountedRef';
|
|
|
|
interface UseAccounts {
|
|
allAddresses: string[];
|
|
hasAddresses: boolean;
|
|
}
|
|
|
|
export default function useAccounts (): UseAccounts {
|
|
const mounted = useIsMountedRef();
|
|
const [state, setState] = useState<UseAccounts>({ allAddresses: [], hasAddresses: false });
|
|
|
|
useEffect((): () => void => {
|
|
const subscription = addressObservable.subject.subscribe((addresses): void => {
|
|
if (mounted.current) {
|
|
const allAddresses = addresses ? Object.keys(addresses) : [];
|
|
const hasAddresses = allAddresses.length !== 0;
|
|
|
|
setState({ allAddresses, hasAddresses });
|
|
}
|
|
});
|
|
|
|
return (): void => {
|
|
setTimeout(() => subscription.unsubscribe(), 0);
|
|
};
|
|
}, []);
|
|
|
|
return state;
|
|
}
|