grafana/public/app/features/dashboard/components/SubMenu/Annotations.tsx

import React, { FunctionComponent, useEffect, useState } from 'react';
import { AnnotationQuery, EventBus } from '@grafana/data';
import { AnnotationPicker } from './AnnotationPicker';

interface Props {
  events: EventBus;
  annotations: AnnotationQuery[];
  onAnnotationChanged: (annotation: any) => void;
}

export const Annotations: FunctionComponent<Props> = ({ annotations, onAnnotationChanged, events }) => {
  const [visibleAnnotations, setVisibleAnnotations] = useState<AnnotationQuery[]>([]);
  useEffect(() => {
    setVisibleAnnotations(annotations.filter((annotation) => annotation.hide !== true));
  }, [annotations]);

  if (visibleAnnotations.length === 0) {
    return null;
  }

  return (
    <>
      {visibleAnnotations.map((annotation) => (
        <AnnotationPicker
          events={events}
          annotation={annotation}
          onEnabledChanged={onAnnotationChanged}
          key={annotation.name}
        />
      ))}
    </>
  );
};