MenuList.tsx

// The MIT License
//
// Copyright (c) 2019 Google, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

import * as React from 'react';
import List, {ListProps} from '@material/react-list';
// eslint-disable-next-line @typescript-eslint/no-unused-vars
import {MDCMenuFoundation} from '@material/menu/foundation';

type RefCallback<T> = (node: T | null) => void;

export interface MenuListProps extends Exclude<ListProps, 'ref'> {
  innerRef?: RefCallback<List> | React.RefObject<List>;
  handleItemAction?: MDCMenuFoundation['handleItemAction'];
}

class MenuList extends React.Component<MenuListProps, {}> {
  private listInstance = React.createRef<List>();

  static defaultProps: Partial<MenuListProps> = {
    className: '',
    handleSelect: () => {},
    handleItemAction: () => {},
  };

  get listElements(): Element[] {
    if (!this.listInstance.current) {
      return [];
    }
    return this.listInstance.current.listElements;
  }

  handleSelect: ListProps['handleSelect'] = (activatedItemIndex, selected) => {
    this.props.handleSelect!(activatedItemIndex, selected);
    this.props.handleItemAction!(this.listElements[activatedItemIndex]);
  };

  attachRef = (node: List | null) => {
    const {innerRef} = this.props;

    // https://github.com/facebook/react/issues/13029#issuecomment-410002316
    // @ts-ignore this is acceptable according to the comment above
    this.listInstance.current = node;

    if (!innerRef) {
      return;
    }

    if (typeof innerRef !== 'function') {
      // @ts-ignore same as above
      innerRef.current = node;
    } else {
      innerRef(node);
    }
  };

  render() {
    const {
      'aria-hidden': ariaHidden,
      /* eslint-disable @typescript-eslint/no-unused-vars */
      handleSelect,
      handleItemAction,
      role,
      innerRef,
      children,
      ref,
      /* eslint-enable @typescript-eslint/no-unused-vars */
      ...otherProps
    } = this.props;

    return (
      <List
        aria-hidden={ariaHidden !== undefined ? ariaHidden : 'true'}
        role={role || 'menu'}
        handleSelect={this.handleSelect}
        ref={this.attachRef}
        {...otherProps}
      >
        {children}
      </List>
    );
  }
}

export default MenuList;