53 lines
1.5 KiB
TypeScript
53 lines
1.5 KiB
TypeScript
// Copyright 2017-2020 @polkadot/apps authors & contributors
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// This software may be modified and distributed under the terms
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// of the Apache-2.0 license. See the LICENSE file for details.
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import React, { useMemo } from 'react';
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import styled from 'styled-components';
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import { chainLogos, emptyLogo, namedLogos, nodeLogos } from '@polkadot/apps-config/ui/logos';
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import { useApi } from '@polkadot/react-hooks';
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interface Props {
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className?: string;
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logo?: keyof typeof namedLogos;
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onClick?: () => any;
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}
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function preloadSet (images: Record<string, any>): void {
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Object.values(images).forEach((src): void => {
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new Image().src = src as string;
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});
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}
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function sanitize (value?: string): string {
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return value?.toLowerCase().replace('-', ' ') || '';
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}
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// preload on app init
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preloadSet(chainLogos);
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preloadSet(namedLogos);
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preloadSet(nodeLogos);
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function ChainImg ({ className = '', logo, onClick }: Props): React.ReactElement<Props> {
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const { systemChain, systemName } = useApi();
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const [isEmpty, img] = useMemo((): [boolean, string] => {
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const found: unknown = namedLogos[logo || ''] || chainLogos[sanitize(systemChain)] || nodeLogos[sanitize(systemName)];
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return [!found || logo === 'empty', (found || emptyLogo) as string];
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}, [logo, systemChain, systemName]);
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return (
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<img
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alt='chain logo'
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className={`${className}${isEmpty ? ' highlight--bg' : ''}`}
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onClick={onClick}
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src={img}
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/>
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);
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}
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export default React.memo(styled(ChainImg)`
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border-radius: 50%;
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box-sizing: border-box;
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`);
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