Class PortalHost

src/components/Portal/PortalHost.tsx:45–137

 * Here any `Portal` elements under `<App />` are rendered alongside `<App />` and will appear above `<App />` like a `Modal`.
 */
export default class PortalHost extends React.Component<Props> {
  static displayName = 'Portal.Host';

  componentDidMount() {
    const manager = this.manager;
    const queue = this.queue;

    while (queue.length && manager) {
      const action = queue.pop();
      if (action) {
        // eslint-disable-next-line default-case
        switch (action.type) {
          case 'mount':
            manager.mount(action.key, action.children);
            break;
          case 'update':
            manager.update(action.key, action.children);
            break;
          case 'unmount':
            manager.unmount(action.key);
            break;
        }
      }
    }
  }

  private setManager = (manager: PortalManager | undefined | null) => {
    this.manager = manager;
  };

  private mount = (children: React.ReactNode) => {
    const key = this.nextKey++;

    if (this.manager) {
      this.manager.mount(key, children);
    } else {
      this.queue.push({ type: 'mount', key, children });
    }

    return key;
  };

  private update = (key: number, children: React.ReactNode) => {
    if (this.manager) {
      this.manager.update(key, children);
    } else {
      const op: Operation = { type: 'mount', key, children };
      const index = this.queue.findIndex(
        (o) => o.type === 'mount' || (o.type === 'update' && o.key === key)
      );

      if (index > -1) {
        this.queue[index] = op;
      } else {
        this.queue.push(op as Operation);
      }
    }
  };