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AccountSelector.js
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AccountSelector.js
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import React, { useState, useEffect } from 'react';
import {
Menu,
Dropdown,
Container,
Icon,
Image,
Label
} from 'semantic-ui-react';
import { useSubstrate } from './substrate-lib';
export default function AccountSelector(props) {
const { api, keyring } = useSubstrate();
const { setAccountAddress } = props;
const [accountSelected, setAccountSelected] = useState('');
// Get the list of accounts we possess the private key for
const keyringOptions = keyring.getPairs().map(account => ({
key: account.address,
value: account.address,
text: account.meta.name.toUpperCase(),
icon: 'user'
}));
const initialAddress =
keyringOptions.length > 0 ? keyringOptions[0].value : '';
// Set the initial address
useEffect(() => {
setAccountSelected(initialAddress);
setAccountAddress(initialAddress);
}, [setAccountAddress, initialAddress]);
const onChange = address => {
// Update state with new account address
setAccountAddress(address);
setAccountSelected(address);
};
return (
<Menu
attached='top'
tabular
style={{
backgroundColor: '#fff',
borderColor: '#fff',
paddingTop: '1em',
paddingBottom: '1em'
}}
>
<Container>
<Menu.Menu>
<Image src='Substrate-Logo.png' size='mini' />
</Menu.Menu>
<Menu.Menu position='right'>
{!accountSelected ? (
<span>
Add your account with the{' '}
<a
target='_blank'
rel="noopener noreferrer"
href='https://github.com/polkadot-js/extension'
>
Polkadot JS Extension
</a>
</span>
) : null}
<Icon
name='users'
size='large'
circular
color={accountSelected ? 'green' : 'red'}
/>
<Dropdown
search
selection
clearable
placeholder='Select an account'
options={keyringOptions}
onChange={(_, dropdown) => {
onChange(dropdown.value);
}}
value={accountSelected}
/>
{api.query.system && api.query.system.account ? (
<BalanceAnnotation accountSelected={accountSelected} />
) : null}
</Menu.Menu>
</Container>
</Menu>
);
}
function BalanceAnnotation(props) {
const { accountSelected } = props;
const { api } = useSubstrate();
const [accountBalance, setAccountBalance] = useState(0);
// When account address changes, update subscriptions
useEffect(() => {
let unsubscribe;
// If the user has selected an address, create a new subscription
accountSelected &&
api.query.system
.account(accountSelected, accountData => {
setAccountBalance(accountData.data.free.toString());
})
.then(unsub => {
unsubscribe = unsub;
})
.catch(console.error);
return () => unsubscribe && unsubscribe();
}, [accountSelected, api.query.system]);
return accountSelected ? (
<Label pointing='left'>
<Icon
name='money bill alternate'
color={accountBalance > 0 ? 'green' : 'red'}
/>
{accountBalance}
</Label>
) : null;
}