src/client/views/nodes/FaceRectangle.tsx


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import { observable, runInAction } from 'mobx';
import { observer } from 'mobx-react';
import * as React from 'react';
import { RectangleTemplate } from './FaceRectangles';

@observer
export default class FaceRectangle extends React.Component<{ rectangle: RectangleTemplate }> {
    @observable private opacity = 0;

    componentDidMount() {
        setTimeout(
            () =>
                runInAction(() => {
                    this.opacity = 1;
                }),
            500
        );
    }

    render() {
        const { rectangle } = this.props;
        return (
            <div
                style={{
                    ...rectangle.style,
                    opacity: this.opacity,
                    transition: '1s ease opacity',
                    position: 'absolute',
                    borderRadius: 5,
                }}
            />
        );
    }
}