60 lines
1.8 KiB
TypeScript
60 lines
1.8 KiB
TypeScript
// Copyright 2017-2020 @polkadot/react-components authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import BN from 'bn.js';
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import { TFunction } from 'i18next';
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import React, { useRef } from 'react';
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import { ApiPromise } from '@polkadot/api';
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import { useApi, useBlockTime } from '@polkadot/react-hooks';
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import Dropdown from './Dropdown';
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import { useTranslation } from './translate';
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export interface Props {
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className?: string;
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help?: string
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label?: React.ReactNode;
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onChange?:(value: number) => void;
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value?: number;
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}
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const CONVICTIONS: [number, number, BN][] = [1, 2, 4, 8, 16, 32].map((lock, index) => [index + 1, lock, new BN(lock)]);
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const SEC_DAY = 60 * 60 * 24;
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function createOptions (api: ApiPromise, t: TFunction, blockTime: number): { text: string; value: number }[] {
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return [
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{ text: t<string>('0.1x voting balance, no lockup period'), value: 0 },
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...CONVICTIONS.map(([value, lock, bnLock]): { text: string; value: number } => ({
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text: t<string>('{{value}}x voting balance, locked for {{lock}}x enactment ({{period}} days)', {
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replace: {
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lock,
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period: (bnLock.mul(api.consts.democracy.enactmentPeriod.muln(blockTime).divn(1000)).toNumber() / SEC_DAY).toFixed(2),
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value
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}
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}),
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value
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}))
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];
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}
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function Convictions ({ className = '', help, label, onChange, value }: Props): React.ReactElement<Props> | null {
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const { api } = useApi();
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const { t } = useTranslation();
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const [blockTime] = useBlockTime();
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const optionsRef = useRef(createOptions(api, t, blockTime));
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return (
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<Dropdown
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className={className}
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help={help}
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label={label}
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onChange={onChange}
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options={optionsRef.current}
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value={value}
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/>
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);
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}
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export default React.memo(Convictions);
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