ant-design/components/_util/PurePanel.tsx

import useMergedState from 'rc-util/lib/hooks/useMergedState';
import * as React from 'react';
import ConfigProvider, { ConfigContext } from '../config-provider';

export interface BaseProps {
  prefixCls?: string;
  style?: React.CSSProperties;
}

/* istanbul ignore next */
export default function genPurePanel<ComponentProps extends BaseProps>(
  Component: any,
  defaultPrefixCls?: string,
  getDropdownCls?: null | ((prefixCls: string) => string),
  postProps?: (props: ComponentProps) => ComponentProps,
) {
  type WrapProps = Omit<ComponentProps, 'open' | 'visible'> & { open?: boolean };

  return function PurePanel(props: WrapProps) {
    const { prefixCls: customizePrefixCls, style } = props;

    const holderRef = React.useRef<HTMLDivElement>(null);
    const [popupHeight, setPopupHeight] = React.useState(0);
    const [popupWidth, setPopupWidth] = React.useState(0);
    const [open, setOpen] = useMergedState(false, {
      value: props.open,
    });

    const { getPrefixCls } = React.useContext(ConfigContext);
    const prefixCls = getPrefixCls(defaultPrefixCls || 'select', customizePrefixCls);

    React.useEffect(() => {
      // We do not care about ssr
      setOpen(true);

      if (typeof ResizeObserver !== 'undefined') {
        const resizeObserver = new ResizeObserver((entries) => {
          const element: HTMLDivElement = entries[0].target as any;
          setPopupHeight(element.offsetHeight + 8);
          setPopupWidth(element.offsetWidth);
        });

        const interval = setInterval(() => {
          const dropdownCls = getDropdownCls
            ? `.${getDropdownCls(prefixCls)}`
            : `.${prefixCls}-dropdown`;
          const popup = holderRef.current?.querySelector(dropdownCls);

          if (popup) {
            clearInterval(interval);
            resizeObserver.observe(popup);
          }
        }, 10);

        return () => {
          clearInterval(interval);
          resizeObserver.disconnect();
        };
      }
    }, []);

    let mergedProps: WrapProps = {
      ...props,
      style: {
        ...style,
        margin: 0,
      },
      open,
      visible: open,
      getPopupContainer: () => holderRef.current!,
    };

    if (postProps) {
      mergedProps = postProps(mergedProps as ComponentProps);
    }

    return (
      <ConfigProvider
        theme={{
          token: {
            motion: false,
          },
        }}
      >
        <div
          ref={holderRef}
          style={{
            paddingBottom: popupHeight,
            position: 'relative',
            minWidth: popupWidth,
          }}
        >
          <Component {...mergedProps} />
        </div>
      </ConfigProvider>
    );
  } as typeof Component;
}