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

Core utilities for building navigators

"use strict";

import * as React from 'react';
import { NavigationBuilderContext } from "./NavigationBuilderContext.js";
import { NavigationStateContext } from "./NavigationStateContext.js";
export function useOptionsGetters({
  key,
  options,
  navigation
}) {
  const optionsRef = React.useRef(options);
  const optionsGettersFromChildRef = React.useRef({});
  const {
    onOptionsChange
  } = React.useContext(NavigationBuilderContext);
  const {
    addOptionsGetter: parentAddOptionsGetter
  } = React.useContext(NavigationStateContext);
  const optionsChangeListener = React.useCallback(() => {
    const isFocused = navigation?.isFocused() ?? true;
    const hasChildren = Object.keys(optionsGettersFromChildRef.current).length;
    if (isFocused && !hasChildren) {
      onOptionsChange(optionsRef.current ?? {});
    }
  }, [navigation, onOptionsChange]);
  React.useEffect(() => {
    optionsRef.current = options;
    optionsChangeListener();
    return navigation?.addListener('focus', optionsChangeListener);
  }, [navigation, options, optionsChangeListener]);
  const getOptionsFromListener = React.useCallback(() => {
    for (const key in optionsGettersFromChildRef.current) {
      if (key in optionsGettersFromChildRef.current) {
        const result = optionsGettersFromChildRef.current[key]?.();

        // null means unfocused route
        if (result !== null) {
          return result;
        }
      }
    }
    return null;
  }, []);
  const getCurrentOptions = React.useCallback(() => {
    const isFocused = navigation?.isFocused() ?? true;
    if (!isFocused) {
      return null;
    }
    const optionsFromListener = getOptionsFromListener();
    if (optionsFromListener !== null) {
      return optionsFromListener;
    }
    return optionsRef.current;
  }, [navigation, getOptionsFromListener]);
  React.useEffect(() => {
    return parentAddOptionsGetter?.(key, getCurrentOptions);
  }, [getCurrentOptions, parentAddOptionsGetter, key]);
  const addOptionsGetter = React.useCallback((key, getter) => {
    optionsGettersFromChildRef.current[key] = getter;
    optionsChangeListener();
    return () => {
      // eslint-disable-next-line @typescript-eslint/no-dynamic-delete
      delete optionsGettersFromChildRef.current[key];
      optionsChangeListener();
    };
  }, [optionsChangeListener]);
  return {
    addOptionsGetter,
    getCurrentOptions
  };
}
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