react-diagrams/diagrams-demo-gallery/demos/helpers/DemoCanvasWidget.tsx

import * as React from 'react';
import styled from '@emotion/styled';
import { css, Global } from '@emotion/react';

export interface DemoCanvasWidgetProps {
	color?: string;
	background?: string;
}

namespace S {
	export const Container = styled.div<{ color: string; background: string }>`
		height: 100%;
		background-color: ${(p) => p.background};
		background-size: 50px 50px;
		display: flex;

		> * {
			height: 100%;
			min-height: 100%;
			width: 100%;
		}

		background-image: linear-gradient(
				0deg,
				transparent 24%,
				${(p) => p.color} 25%,
				${(p) => p.color} 26%,
				transparent 27%,
				transparent 74%,
				${(p) => p.color} 75%,
				${(p) => p.color} 76%,
				transparent 77%,
				transparent
			),
			linear-gradient(
				90deg,
				transparent 24%,
				${(p) => p.color} 25%,
				${(p) => p.color} 26%,
				transparent 27%,
				transparent 74%,
				${(p) => p.color} 75%,
				${(p) => p.color} 76%,
				transparent 77%,
				transparent
			);
	`;

	export const Expand = css`
		html,
		body,
		#root {
			height: 100%;
		}
	`;
}

export class DemoCanvasWidget extends React.Component<React.PropsWithChildren<DemoCanvasWidgetProps>> {
	render() {
		return (
			<>
				<Global styles={S.Expand} />
				<S.Container
					background={this.props.background || 'rgb(60, 60, 60)'}
					color={this.props.color || 'rgba(255,255,255, 0.05)'}
				>
					{this.props.children}
				</S.Container>
			</>
		);
	}
}