@react-navigation/core/lib/commonjs/useOnGetState.js

Core utilities for building navigators

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.useOnGetState = useOnGetState;
var React = _interopRequireWildcard(require("react"));
var _isArrayEqual = require("./isArrayEqual.js");
var _NavigationBuilderContext = require("./NavigationBuilderContext.js");
var _NavigationRouteContext = require("./NavigationRouteContext.js");
function _getRequireWildcardCache(e) { if ("function" != typeof WeakMap) return null; var r = new WeakMap(), t = new WeakMap(); return (_getRequireWildcardCache = function (e) { return e ? t : r; })(e); }
function _interopRequireWildcard(e, r) { if (!r && e && e.__esModule) return e; if (null === e || "object" != typeof e && "function" != typeof e) return { default: e }; var t = _getRequireWildcardCache(r); if (t && t.has(e)) return t.get(e); var n = { __proto__: null }, a = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var u in e) if ("default" !== u && {}.hasOwnProperty.call(e, u)) { var i = a ? Object.getOwnPropertyDescriptor(e, u) : null; i && (i.get || i.set) ? Object.defineProperty(n, u, i) : n[u] = e[u]; } return n.default = e, t && t.set(e, n), n; }
function useOnGetState({
  getState,
  getStateListeners
}) {
  const {
    addKeyedListener
  } = React.useContext(_NavigationBuilderContext.NavigationBuilderContext);
  const route = React.useContext(_NavigationRouteContext.NavigationRouteContext);
  const key = route ? route.key : 'root';
  const getRehydratedState = React.useCallback(() => {
    const state = getState();

    // Avoid returning new route objects if we don't need to
    const routes = state.routes.map(route => {
      const childState = getStateListeners[route.key]?.();
      if (route.state === childState) {
        return route;
      }
      return {
        ...route,
        state: childState
      };
    });
    if ((0, _isArrayEqual.isArrayEqual)(state.routes, routes)) {
      return state;
    }
    return {
      ...state,
      routes
    };
  }, [getState, getStateListeners]);
  React.useEffect(() => {
    return addKeyedListener?.('getState', key, getRehydratedState);
  }, [addKeyedListener, getRehydratedState, key]);
}
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