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

Core utilities for building navigators

import { nanoid } from 'nanoid/non-secure';
import * as React from 'react';
import useLatestCallback from 'use-latest-callback';
import useNavigation from './useNavigation';
import usePreventRemoveContext from './usePreventRemoveContext';
import useRoute from './useRoute';

/**
 * Hook to prevent screen from being removed. Can be used to prevent users from leaving the screen.
 *
 * @param preventRemove Boolean indicating whether to prevent screen from being removed.
 * @param callback Function which is executed when screen was prevented from being removed.
 */
export default function usePreventRemove(preventRemove, callback) {
  const [id] = React.useState(() => nanoid());
  const navigation = useNavigation();
  const {
    key: routeKey
  } = useRoute();
  const {
    setPreventRemove
  } = usePreventRemoveContext();
  React.useEffect(() => {
    setPreventRemove(id, routeKey, preventRemove);
    return () => {
      setPreventRemove(id, routeKey, false);
    };
  }, [setPreventRemove, id, routeKey, preventRemove]);
  const beforeRemoveListener = useLatestCallback(e => {
    if (!preventRemove) {
      return;
    }
    e.preventDefault();
    callback({
      data: e.data
    });
  });
  React.useEffect(() => navigation === null || navigation === void 0 ? void 0 : navigation.addListener('beforeRemove', beforeRemoveListener), [navigation, beforeRemoveListener]);
}
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