standardnotes-app-web/app/assets/javascripts/components/NotesOptionsPanel.tsx

import { AppState } from '@/ui_models/app_state';
import { Icon } from './Icon';
import VisuallyHidden from '@reach/visually-hidden';
import { useCloseOnBlur } from './utils';
import {
  Disclosure,
  DisclosureButton,
  DisclosurePanel,
} from '@reach/disclosure';
import { useRef, useState } from 'preact/hooks';
import { observer } from 'mobx-react-lite';
import { NotesOptions } from './NotesOptions/NotesOptions';
import { WebApplication } from '@/ui_models/application';

type Props = {
  application: WebApplication;
  appState: AppState;
};

export const NotesOptionsPanel = observer(
  ({ application, appState }: Props) => {
    const [open, setOpen] = useState(false);
    const [position, setPosition] = useState({
      top: 0,
      right: 0,
    });
    const [maxHeight, setMaxHeight] = useState<number | 'auto'>('auto');
    const buttonRef = useRef<HTMLButtonElement>(null);
    const panelRef = useRef<HTMLDivElement>(null);
    const [closeOnBlur] = useCloseOnBlur(panelRef, setOpen);
    const [submenuOpen, setSubmenuOpen] = useState(false);

    const onSubmenuChange = (open: boolean) => {
      setSubmenuOpen(open);
    };

    return (
      <Disclosure
        open={open}
        onChange={() => {
          const rect = buttonRef.current?.getBoundingClientRect();
          if (rect) {
            const { clientHeight } = document.documentElement;
            const footerElementRect = document
              .getElementById('footer-bar')
              ?.getBoundingClientRect();
            const footerHeightInPx = footerElementRect?.height;
            if (footerHeightInPx) {
              setMaxHeight(clientHeight - rect.bottom - footerHeightInPx - 2);
            }
            setPosition({
              top: rect.bottom,
              right: document.body.clientWidth - rect.right,
            });
            setOpen(!open);
          }
        }}
      >
        <DisclosureButton
          onKeyDown={(event) => {
            if (event.key === 'Escape' && !submenuOpen) {
              setOpen(false);
            }
          }}
          onBlur={closeOnBlur}
          ref={buttonRef}
          className="sn-icon-button"
        >
          <VisuallyHidden>Actions</VisuallyHidden>
          <Icon type="more" className="block" />
        </DisclosureButton>
        <DisclosurePanel
          onKeyDown={(event) => {
            if (event.key === 'Escape' && !submenuOpen) {
              setOpen(false);
              buttonRef.current?.focus();
            }
          }}
          ref={panelRef}
          style={{
            ...position,
            maxHeight,
          }}
          className="sn-dropdown sn-dropdown--animated min-w-80 max-h-120 max-w-xs flex flex-col py-2 overflow-y-auto fixed"
          onBlur={closeOnBlur}
        >
          {open && (
            <NotesOptions
              application={application}
              appState={appState}
              closeOnBlur={closeOnBlur}
              onSubmenuChange={onSubmenuChange}
            />
          )}
        </DisclosurePanel>
      </Disclosure>
    );
  }
);