@react-navigation/core/lib/module/useOnRouteFocus.js

Core utilities for building navigators

"use strict";

import * as React from 'react';
import { NavigationBuilderContext } from "./NavigationBuilderContext.js";
/**
 * Hook to handle focus actions for a route.
 * Focus action needs to be treated specially, coz when a nested route is focused,
 * the parent navigators also needs to be focused.
 */
export function useOnRouteFocus({
  router,
  getState,
  key: sourceRouteKey,
  setState
}) {
  const {
    onRouteFocus: onRouteFocusParent
  } = React.useContext(NavigationBuilderContext);
  return React.useCallback(key => {
    const state = getState();
    const result = router.getStateForRouteFocus(state, key);
    if (result !== state) {
      setState(result);
    }
    if (onRouteFocusParent !== undefined && sourceRouteKey !== undefined) {
      onRouteFocusParent(sourceRouteKey);
    }
  }, [getState, onRouteFocusParent, router, setState, sourceRouteKey]);
}
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